| ; Options for the language- and target-independent parts of the compiler. |
| |
| ; Copyright (C) 2003-2018 Free Software Foundation, Inc. |
| ; |
| ; This file is part of GCC. |
| ; |
| ; GCC is free software; you can redistribute it and/or modify it under |
| ; the terms of the GNU General Public License as published by the Free |
| ; Software Foundation; either version 3, or (at your option) any later |
| ; version. |
| ; |
| ; GCC is distributed in the hope that it will be useful, but WITHOUT ANY |
| ; WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| ; FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| ; for more details. |
| ; |
| ; You should have received a copy of the GNU General Public License |
| ; along with GCC; see the file COPYING3. If not see |
| ; <http://www.gnu.org/licenses/>. |
| |
| ; See the GCC internals manual (options.texi) for a description of this file's format. |
| |
| ; Please try to keep this file in ASCII collating order. |
| |
| Variable |
| int target_flags |
| |
| Variable |
| int optimize |
| |
| Variable |
| int optimize_size |
| |
| Variable |
| int optimize_debug |
| |
| ; Not used directly to control optimizations, only to save -Ofast |
| ; setting for "optimize" attributes. |
| Variable |
| int optimize_fast |
| |
| ; True if this is the lto front end. This is used to disable gimple |
| ; generation and lowering passes that are normally run on the output |
| ; of a front end. These passes must be bypassed for lto since they |
| ; have already been done before the gimple was written. |
| Variable |
| bool in_lto_p = false |
| |
| ; This variable is set to non-0 only by LTO front-end. 1 indicates that |
| ; the output produced will be used for incrmeental linking (thus weak symbols |
| ; can still be bound). |
| Variable |
| int flag_incremental_link = 0 |
| |
| ; 0 means straightforward implementation of complex divide acceptable. |
| ; 1 means wide ranges of inputs must work for complex divide. |
| ; 2 means C99-like requirements for complex multiply and divide. |
| Variable |
| int flag_complex_method = 1 |
| |
| ; Language specific warning pass for unused results. |
| Variable |
| bool flag_warn_unused_result = false |
| |
| Variable |
| int *param_values |
| |
| ; Nonzero if we should write GIMPLE bytecode for link-time optimization. |
| Variable |
| int flag_generate_lto |
| |
| ; Nonzero if we should write GIMPLE bytecode for offload compilation. |
| Variable |
| int flag_generate_offload = 0 |
| |
| ; True to warn about any objects definitions whose size is larger |
| ; than N bytes. Also want about function definitions whose returned |
| ; values are larger than N bytes, where N is 'larger_than_size'. |
| Variable |
| bool warn_larger_than |
| |
| Variable |
| HOST_WIDE_INT larger_than_size |
| |
| ; True to warn about any function whose frame size is larger |
| ; than N bytes. |
| Variable |
| bool warn_frame_larger_than |
| |
| Variable |
| HOST_WIDE_INT frame_larger_than_size |
| |
| ; Nonzero means we should be saving declaration info into a .X file. |
| Variable |
| int flag_gen_aux_info = 0 |
| |
| ; Nonzero if we are compiling code for a shared library, zero for |
| ; executable. |
| Variable |
| int flag_shlib |
| |
| ; These two are really VEC(char_p,heap) *. |
| |
| Variable |
| void *flag_instrument_functions_exclude_functions |
| |
| Variable |
| void *flag_instrument_functions_exclude_files |
| |
| ; Generic structs (e.g. templates not explicitly specialized) |
| ; may not have a compilation unit associated with them, and so |
| ; may need to be treated differently from ordinary structs. |
| ; |
| ; Structs only handled by reference (indirectly), will also usually |
| ; not need as much debugging information. |
| |
| Variable |
| enum debug_struct_file debug_struct_ordinary[DINFO_USAGE_NUM_ENUMS] = { DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY } |
| |
| Variable |
| enum debug_struct_file debug_struct_generic[DINFO_USAGE_NUM_ENUMS] = { DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY } |
| |
| ; True if we should exit after parsing options. |
| Variable |
| bool exit_after_options |
| |
| ; Type(s) of debugging information we are producing (if any). See |
| ; flag-types.h for the definitions of the different possible types of |
| ; debugging information. |
| Variable |
| enum debug_info_type write_symbols = NO_DEBUG |
| |
| ; Level of debugging information we are producing. See flag-types.h |
| ; for the definitions of the different possible levels. |
| Variable |
| enum debug_info_levels debug_info_level = DINFO_LEVEL_NONE |
| |
| ; Nonzero means use GNU-only extensions in the generated symbolic |
| ; debugging information. Currently, this only has an effect when |
| ; write_symbols is set to DBX_DEBUG or XCOFF_DEBUG. |
| Variable |
| bool use_gnu_debug_info_extensions |
| |
| ; Original value of maximum field alignment in bytes, specified via |
| ; -fpack-struct=<value>. |
| Variable |
| unsigned int initial_max_fld_align = TARGET_DEFAULT_PACK_STRUCT |
| |
| ; Type of stack check. |
| Variable |
| enum stack_check_type flag_stack_check = NO_STACK_CHECK |
| |
| ; True if stack usage information needs to be computed. |
| Variable |
| bool flag_stack_usage_info = false |
| |
| ; -dA causes debug commentary information to be produced in |
| ; the generated assembly code (to make it more readable). This option |
| ; is generally only of use to those who actually need to read the |
| ; generated assembly code (perhaps while debugging the compiler itself). |
| ; Currently, this switch is only used by dwarf2out.c; however, it is intended |
| ; to be a catchall for printing debug information in the assembler file. |
| Variable |
| int flag_debug_asm |
| |
| ; How many NOP insns to place at each function entry by default |
| Variable |
| HOST_WIDE_INT function_entry_patch_area_size |
| |
| ; And how far the real asm entry point is into this area |
| Variable |
| HOST_WIDE_INT function_entry_patch_area_start |
| |
| ; Balance between GNAT encodings and standard DWARF to emit. |
| Variable |
| enum dwarf_gnat_encodings gnat_encodings = DWARF_GNAT_ENCODINGS_DEFAULT |
| |
| ; -dP causes the rtl to be emitted as a comment in assembly. |
| Variable |
| int flag_dump_rtl_in_asm |
| |
| ; Whether -da was passed (used only in handle_common_deferred_options). |
| Variable |
| bool flag_dump_all_passed |
| |
| ; Other flags saying which kinds of debugging dump have been requested. |
| |
| Variable |
| int rtl_dump_and_exit |
| |
| Variable |
| int flag_print_asm_name |
| |
| ; Name of top-level original source file (what was input to cpp). |
| ; This comes from the #-command at the beginning of the actual input. |
| ; If there isn't any there, then this is the cc1 input file name. |
| Variable |
| const char *main_input_filename |
| |
| ; Pointer to base name in main_input_filename, with directories and a |
| ; single final extension removed, and the length of this base |
| ; name. |
| |
| Variable |
| const char *main_input_basename |
| |
| Variable |
| int main_input_baselength |
| |
| ; Which options have been printed by --help. |
| Variable |
| char *help_printed |
| |
| ; Which enums have been printed by --help. 0 = not printed, no |
| ; relevant options seen, 1 = relevant option seen, not yet printed, 2 |
| ; = printed. |
| Variable |
| char *help_enum_printed |
| |
| ; The number of columns for --help output. |
| Variable |
| unsigned int help_columns |
| |
| ; Whether this options structure has been through finish_options |
| Variable |
| bool flag_opts_finished |
| |
| ; What the sanitizer should instrument |
| Variable |
| unsigned int flag_sanitize |
| |
| ; What sanitizers should recover from errors |
| Variable |
| unsigned int flag_sanitize_recover = (SANITIZE_UNDEFINED | SANITIZE_UNDEFINED_NONDEFAULT | SANITIZE_KERNEL_ADDRESS) & ~(SANITIZE_UNREACHABLE | SANITIZE_RETURN) |
| |
| ; What the coverage sanitizers should instrument |
| Variable |
| unsigned int flag_sanitize_coverage |
| |
| ; Flag whether a prefix has been added to dump_base_name |
| Variable |
| bool dump_base_name_prefixed = false |
| |
| ; Flag whether HSA generation has been explicitely disabled |
| Variable |
| bool flag_disable_hsa = false |
| |
| ### |
| Driver |
| |
| -assemble |
| Driver Alias(S) |
| |
| -compile |
| Driver Alias(c) |
| |
| -coverage |
| Driver Alias(coverage) |
| |
| -debug |
| Common Alias(g) |
| |
| -dump |
| Common Separate Alias(d) |
| |
| -dump= |
| Common Joined Alias(d) |
| |
| -dumpbase |
| Common Separate Alias(dumpbase) |
| |
| -dumpdir |
| Common Separate Alias(dumpdir) |
| |
| -entry |
| Driver Separate Alias(e) |
| |
| -entry= |
| Driver Joined Alias(e) |
| |
| -extra-warnings |
| Common Warning Alias(Wextra) |
| |
| -for-assembler |
| Driver Separate Alias(Xassembler) |
| |
| -for-assembler= |
| Driver JoinedOrMissing Alias(Xassembler) |
| |
| -for-linker |
| Driver Separate Alias(Xlinker) |
| |
| -for-linker= |
| Driver JoinedOrMissing Alias(Xlinker) |
| |
| -force-link |
| Driver Separate Alias(u) |
| |
| -force-link= |
| Driver Joined Alias(u) |
| |
| -help |
| Common Driver Var(help_flag) |
| Display this information. |
| |
| -help= |
| Common Driver Report Joined |
| --help=<class> Display descriptions of a specific class of options. <class> is one or more of optimizers, target, warnings, undocumented, params. |
| |
| -language |
| Driver Separate Alias(x) |
| |
| -language= |
| Driver Joined Alias(x) |
| |
| -library-directory |
| Driver Separate Alias(L) |
| |
| -library-directory= |
| Driver Joined Alias(L) |
| |
| -no-canonical-prefixes |
| Driver Alias(no-canonical-prefixes) |
| |
| -no-standard-libraries |
| Driver Alias(nostdlib) |
| |
| -no-sysroot-suffix |
| Driver Var(no_sysroot_suffix) |
| |
| -no-warnings |
| Common Alias(w) |
| |
| -optimize |
| Common Alias(O) |
| |
| -output |
| Common Driver Separate Alias(o) MissingArgError(missing filename after %qs) |
| |
| -output= |
| Common Driver Joined Alias(o) MissingArgError(missing filename after %qs) |
| |
| -pass-exit-codes |
| Driver Alias(pass-exit-codes) |
| |
| -pedantic |
| Common Alias(Wpedantic) |
| |
| -pedantic-errors |
| Common Alias(pedantic-errors) |
| |
| -pie |
| Driver Alias(pie) |
| |
| -static-pie |
| Driver Alias(static-pie) |
| |
| -pipe |
| Driver Alias(pipe) |
| |
| -prefix |
| Driver Separate Alias(B) |
| |
| -prefix= |
| Driver JoinedOrMissing Alias(B) |
| |
| -preprocess |
| Driver Alias(E) |
| |
| -print-file-name |
| Driver Separate Alias(print-file-name=) |
| |
| -print-file-name= |
| Driver JoinedOrMissing Alias(print-file-name=) |
| |
| -print-libgcc-file-name |
| Driver Alias(print-libgcc-file-name) |
| |
| -print-multi-directory |
| Driver Alias(print-multi-directory) |
| |
| -print-multi-lib |
| Driver Alias(print-multi-lib) |
| |
| -print-multi-os-directory |
| Driver Alias(print-multi-os-directory) |
| |
| -print-multiarch |
| Driver Alias(print-multiarch) |
| |
| -print-prog-name |
| Driver Separate Alias(print-prog-name=) |
| |
| -print-prog-name= |
| Driver JoinedOrMissing Alias(print-prog-name=) |
| |
| -print-search-dirs |
| Driver Alias(print-search-dirs) |
| |
| -print-sysroot |
| Driver Alias(print-sysroot) |
| |
| -print-sysroot-headers-suffix |
| Driver Alias(print-sysroot-headers-suffix) |
| |
| -profile |
| Common Alias(p) |
| |
| -save-temps |
| Driver Alias(save-temps) |
| |
| -shared |
| Driver Alias(shared) |
| |
| -specs |
| Driver Separate Alias(specs=) |
| |
| -specs= |
| Driver Joined Alias(specs=) |
| |
| -static |
| Driver Alias(static) |
| |
| -symbolic |
| Driver Alias(symbolic) |
| |
| -target-help |
| Common Driver |
| Alias for --help=target. |
| |
| -time |
| Driver Alias(time) |
| |
| -verbose |
| Driver Alias(v) |
| |
| ;; The driver used to convert options such as --help into forms such |
| ;; as -fhelp; the following four entries are for compatibility with |
| ;; any direct uses of those (undocumented) -f forms |
| fhelp |
| Common Driver Alias(-help) |
| |
| fhelp= |
| Common Driver Joined Alias(-help=) |
| |
| ftarget-help |
| Common Driver Alias(-target-help) |
| |
| fversion |
| Common Driver Alias(-version) |
| |
| -param |
| Common Separate |
| --param <param>=<value> Set parameter <param> to value. See below for a complete list of parameters. |
| |
| -param= |
| Common Joined Alias(-param) |
| |
| -sysroot |
| Driver Separate Alias(-sysroot=) |
| |
| -sysroot= |
| Driver JoinedOrMissing |
| |
| -version |
| Common Driver |
| |
| B |
| Driver Joined Separate |
| |
| E |
| Driver |
| |
| L |
| Driver Joined Separate |
| |
| N |
| Driver |
| |
| O |
| Common JoinedOrMissing Optimization |
| -O<number> Set optimization level to <number>. |
| |
| Os |
| Common Optimization |
| Optimize for space rather than speed. |
| |
| Ofast |
| Common Optimization |
| Optimize for speed disregarding exact standards compliance. |
| |
| Og |
| Common Optimization |
| Optimize for debugging experience rather than speed or size. |
| |
| Q |
| Driver |
| |
| Qn |
| Driver Negative(Qy) |
| |
| Qy |
| Driver Negative(Qn) |
| |
| R |
| Driver Joined Separate |
| |
| S |
| Driver |
| |
| T |
| Driver Joined Separate |
| |
| Tbss |
| Driver Separate |
| |
| Tbss= |
| Driver Joined |
| |
| Tdata |
| Driver Separate |
| |
| Tdata= |
| Driver Joined |
| |
| Ttext |
| Driver Separate |
| |
| Ttext= |
| Driver Joined |
| |
| W |
| Common RejectNegative Warning Alias(Wextra) |
| This switch is deprecated; use -Wextra instead. |
| |
| Wa, |
| Driver JoinedOrMissing RejectNegative |
| |
| Wl, |
| Driver JoinedOrMissing RejectNegative |
| |
| Wp, |
| Driver JoinedOrMissing RejectNegative |
| |
| Waggregate-return |
| Common Var(warn_aggregate_return) Warning |
| Warn about returning structures, unions or arrays. |
| |
| Waggressive-loop-optimizations |
| Common Var(warn_aggressive_loop_optimizations) Init(1) Warning |
| Warn if a loop with constant number of iterations triggers undefined behavior. |
| |
| Warray-bounds |
| Common Var(warn_array_bounds) Warning |
| Warn if an array is accessed out of bounds. |
| |
| Warray-bounds= |
| Common Joined RejectNegative UInteger Var(warn_array_bounds) Warning IntegerRange(0, 2) |
| Warn if an array is accessed out of bounds. |
| |
| Wattributes |
| Common Var(warn_attributes) Init(1) Warning |
| Warn about inappropriate attribute usage. |
| |
| Wattribute-alias |
| Common Var(warn_attributes) Init(1) Warning |
| Warn about type safety and similar errors in attribute alias and related. |
| |
| Wcast-align |
| Common Var(warn_cast_align) Warning |
| Warn about pointer casts which increase alignment. |
| |
| Wcast-align=strict |
| Common Var(warn_cast_align,2) Warning |
| Warn about pointer casts which increase alignment. |
| |
| Wcpp |
| Common Var(warn_cpp) Init(1) Warning |
| Warn when a #warning directive is encountered. |
| |
| Wdeprecated-declarations |
| Common Var(warn_deprecated_decl) Init(1) Warning |
| Warn about uses of __attribute__((deprecated)) declarations. |
| |
| Wdisabled-optimization |
| Common Var(warn_disabled_optimization) Warning |
| Warn when an optimization pass is disabled. |
| |
| Werror |
| Common Var(warnings_are_errors) |
| Treat all warnings as errors. |
| |
| Werror= |
| Common Joined |
| Treat specified warning as error. |
| |
| Wextra |
| Common Var(extra_warnings) Warning |
| Print extra (possibly unwanted) warnings. |
| |
| Wfatal-errors |
| Common Var(flag_fatal_errors) |
| Exit on the first error occurred. |
| |
| Wframe-larger-than= |
| Common RejectNegative Joined UInteger Warning |
| -Wframe-larger-than=<number> Warn if a function's stack frame requires more than <number> bytes. |
| |
| Wfree-nonheap-object |
| Common Var(warn_free_nonheap_object) Init(1) Warning |
| Warn when attempting to free a non-heap object. |
| |
| Whsa |
| Common Var(warn_hsa) Init(1) Warning |
| Warn when a function cannot be expanded to HSAIL. |
| |
| Wimplicit-fallthrough |
| Common Alias(Wimplicit-fallthrough=,3,0) Warning |
| |
| Wimplicit-fallthrough= |
| Common Var(warn_implicit_fallthrough) RejectNegative Joined UInteger Warning IntegerRange(0, 5) |
| Warn when a switch case falls through. |
| |
| Winline |
| Common Var(warn_inline) Warning |
| Warn when an inlined function cannot be inlined. |
| |
| Winvalid-memory-model |
| Common Var(warn_invalid_memory_model) Init(1) Warning |
| Warn when an atomic memory model parameter is known to be outside the valid range. |
| |
| Wlarger-than- |
| Common RejectNegative Joined Warning Undocumented Alias(Wlarger-than=) |
| |
| Wlarger-than= |
| Common RejectNegative Joined UInteger Warning |
| -Wlarger-than=<number> Warn if an object is larger than <number> bytes. |
| |
| Wnonnull-compare |
| Var(warn_nonnull_compare) Warning |
| Warn if comparing pointer parameter with nonnull attribute with NULL. |
| |
| Wnull-dereference |
| Common Var(warn_null_dereference) Warning |
| Warn if dereferencing a NULL pointer may lead to erroneous or undefined behavior. |
| |
| Wunsafe-loop-optimizations |
| Common Ignore Warning |
| Does nothing. Preserved for backward compatibility. |
| |
| Wmissing-noreturn |
| Common Warning Alias(Wsuggest-attribute=noreturn) |
| |
| Wodr |
| Common Var(warn_odr_violations) Init(1) Warning |
| Warn about some C++ One Definition Rule violations during link time optimization. |
| |
| Woverflow |
| Common Var(warn_overflow) Init(1) Warning |
| Warn about overflow in arithmetic expressions. |
| |
| Wlto-type-mismatch |
| Common Var(warn_lto_type_mismatch) Init(1) Warning |
| During link time optimization warn about mismatched types of global declarations. |
| |
| Wpacked |
| Common Var(warn_packed) Warning |
| Warn when the packed attribute has no effect on struct layout. |
| |
| Wpadded |
| Common Var(warn_padded) Warning |
| Warn when padding is required to align structure members. |
| |
| Wpedantic |
| Common Var(pedantic) Init(0) Warning |
| Issue warnings needed for strict compliance to the standard. |
| |
| Wreturn-local-addr |
| Common Var(warn_return_local_addr) Init(1) Warning |
| Warn about returning a pointer/reference to a local or temporary variable. |
| |
| Wshadow |
| Common Var(warn_shadow) Warning |
| Warn when one variable shadows another. Same as -Wshadow=global. |
| |
| Wshadow=global |
| Common Warning Alias(Wshadow) |
| Warn when one variable shadows another (globally). |
| |
| Wshadow=local |
| Common Var(warn_shadow_local) Warning EnabledBy(Wshadow) |
| Warn when one local variable shadows another local variable or parameter. |
| |
| Wshadow-local |
| Common Warning Undocumented Alias(Wshadow=local) |
| |
| Wshadow=compatible-local |
| Common Var(warn_shadow_compatible_local) Warning EnabledBy(Wshadow=local) |
| Warn when one local variable shadows another local variable or parameter of compatible type. |
| |
| Wshadow-compatible-local |
| Common Warning Undocumented Alias(Wshadow=compatible-local) |
| |
| Wstack-protector |
| Common Var(warn_stack_protect) Warning |
| Warn when not issuing stack smashing protection for some reason. |
| |
| Wstack-usage= |
| Common Joined RejectNegative UInteger Var(warn_stack_usage) Warning |
| -Wstack-usage=<number> Warn if stack usage might be larger than specified amount. |
| |
| Wstrict-aliasing |
| Common Warning |
| Warn about code which might break strict aliasing rules. |
| |
| Wstrict-aliasing= |
| Common Joined RejectNegative UInteger Var(warn_strict_aliasing) Warning |
| Warn about code which might break strict aliasing rules. |
| |
| Wstrict-overflow |
| Common Warning |
| Warn about optimizations that assume that signed overflow is undefined. |
| |
| Wstrict-overflow= |
| Common Joined RejectNegative UInteger Var(warn_strict_overflow) Warning |
| Warn about optimizations that assume that signed overflow is undefined. |
| |
| Wsuggest-attribute=cold |
| Common Var(warn_suggest_attribute_cold) Warning |
| Warn about functions which might be candidates for __attribute__((cold)). |
| |
| Wsuggest-attribute=const |
| Common Var(warn_suggest_attribute_const) Warning |
| Warn about functions which might be candidates for __attribute__((const)). |
| |
| Wsuggest-attribute=pure |
| Common Var(warn_suggest_attribute_pure) Warning |
| Warn about functions which might be candidates for __attribute__((pure)). |
| |
| Wsuggest-attribute=noreturn |
| Common Var(warn_suggest_attribute_noreturn) Warning |
| Warn about functions which might be candidates for __attribute__((noreturn)). |
| |
| Wsuggest-attribute=malloc |
| Common Var(warn_suggest_attribute_malloc) Warning |
| Warn about functions which might be candidates for __attribute__((malloc)). |
| |
| Wsuggest-final-types |
| Common Var(warn_suggest_final_types) Warning |
| Warn about C++ polymorphic types where adding final keyword would improve code quality. |
| |
| Wsuggest-final-methods |
| Common Var(warn_suggest_final_methods) Warning |
| Warn about C++ virtual methods where adding final keyword would improve code quality. |
| |
| Wswitch-unreachable |
| Common Var(warn_switch_unreachable) Warning Init(1) |
| Warn about statements between switch's controlling expression and the first |
| case. |
| |
| Wsystem-headers |
| Common Var(warn_system_headers) Warning |
| Do not suppress warnings from system headers. |
| |
| Wtrampolines |
| Common Var(warn_trampolines) Warning |
| Warn whenever a trampoline is generated. |
| |
| Wtype-limits |
| Common Var(warn_type_limits) Warning EnabledBy(Wextra) |
| Warn if a comparison is always true or always false due to the limited range of the data type. |
| |
| Wuninitialized |
| Common Var(warn_uninitialized) Warning EnabledBy(Wextra) |
| Warn about uninitialized automatic variables. |
| |
| Wmaybe-uninitialized |
| Common Var(warn_maybe_uninitialized) Warning EnabledBy(Wuninitialized) |
| Warn about maybe uninitialized automatic variables. |
| |
| Wunreachable-code |
| Common Ignore Warning |
| Does nothing. Preserved for backward compatibility. |
| |
| Wunused |
| Common Var(warn_unused) Init(0) Warning |
| Enable all -Wunused- warnings. |
| |
| Wunused-but-set-parameter |
| Common Var(warn_unused_but_set_parameter) Warning EnabledBy(Wunused && Wextra) |
| Warn when a function parameter is only set, otherwise unused. |
| |
| Wunused-but-set-variable |
| Common Var(warn_unused_but_set_variable) Warning EnabledBy(Wunused) |
| Warn when a variable is only set, otherwise unused. |
| |
| Wunused-function |
| Common Var(warn_unused_function) Warning EnabledBy(Wunused) |
| Warn when a function is unused. |
| |
| Wunused-label |
| Common Var(warn_unused_label) Warning EnabledBy(Wunused) |
| Warn when a label is unused. |
| |
| Wunused-parameter |
| Common Var(warn_unused_parameter) Warning EnabledBy(Wunused && Wextra) |
| Warn when a function parameter is unused. |
| |
| Wunused-value |
| Common Var(warn_unused_value) Warning EnabledBy(Wunused) |
| Warn when an expression value is unused. |
| |
| Wunused-variable |
| Common Var(warn_unused_variable) Warning EnabledBy(Wunused) |
| Warn when a variable is unused. |
| |
| Wcoverage-mismatch |
| Common Var(warn_coverage_mismatch) Init(1) Warning |
| Warn in case profiles in -fprofile-use do not match. |
| |
| Wvector-operation-performance |
| Common Var(warn_vector_operation_performance) Warning |
| Warn when a vector operation is compiled outside the SIMD. |
| |
| Xassembler |
| Driver Separate |
| |
| Xlinker |
| Driver Separate |
| |
| Xpreprocessor |
| Driver Separate |
| |
| Z |
| Driver |
| |
| aux-info |
| Common Separate Var(aux_info_file_name) |
| -aux-info <file> Emit declaration information into <file>. |
| |
| aux-info= |
| Common Joined Alias(aux-info) |
| |
| auxbase |
| Common Separate RejectDriver Var(aux_base_name) |
| |
| auxbase-strip |
| Common Separate RejectDriver |
| |
| coverage |
| Driver |
| |
| c |
| Driver |
| |
| d |
| Common Joined |
| -d<letters> Enable dumps from specific passes of the compiler. |
| |
| dumpbase |
| Common Separate Var(dump_base_name) |
| -dumpbase <file> Set the file basename to be used for dumps. |
| |
| dumpdir |
| Common Separate Var(dump_dir_name) |
| -dumpdir <dir> Set the directory name to be used for dumps. |
| |
| dumpmachine |
| Driver |
| |
| dumpspecs |
| Driver |
| |
| dumpversion |
| Driver |
| |
| dumpfullversion |
| Driver |
| |
| e |
| Driver Joined Separate |
| |
| ; This option has historically been passed down to the linker by an |
| ; accident of a %{e*} spec, so ensure it continues to be passed down |
| ; as a single option. The supported option for this purpose is |
| ; -rdynamic. See PR 47390. |
| export-dynamic |
| Driver Undocumented |
| |
| ; The version of the C++ ABI in use. The following values are allowed: |
| ; |
| ; 0: The version of the ABI believed most conformant with the C++ ABI |
| ; specification. This ABI may change as bugs are discovered and fixed. |
| ; Therefore, 0 will not necessarily indicate the same ABI in different |
| ; versions of G++. |
| ; |
| ; 1: The version of the ABI first used in G++ 3.2. No longer selectable. |
| ; |
| ; 2: The version of the ABI first used in G++ 3.4, and the default |
| ; until GCC 4.9. |
| ; |
| ; 3: The version of the ABI that fixes the missing underscore |
| ; in template non-type arguments of pointer type. |
| ; |
| ; 4: The version of the ABI that introduces unambiguous mangling of |
| ; vector types. First selectable in G++ 4.5. |
| ; |
| ; 5: The version of the ABI that ignores attribute const/noreturn |
| ; in function pointer mangling, and corrects mangling of decltype and |
| ; function parameters used in other parameters and the return type. |
| ; First selectable in G++ 4.6. |
| ; |
| ; 6: The version of the ABI that doesn't promote scoped enums to int and |
| ; changes the mangling of template argument packs, const/static_cast, |
| ; prefix ++ and --, and a class scope function used as a template |
| ; argument. |
| ; First selectable in G++ 4.7. |
| ; |
| ; 7: The version of the ABI that treats nullptr_t as a builtin type and |
| ; corrects the mangling of lambdas in default argument scope. |
| ; First selectable in G++ 4.8. |
| ; |
| ; 8: The version of the ABI that corrects the substitution behavior of |
| ; function types with function-cv-qualifiers. |
| ; First selectable in G++ 4.9 and default in G++ 5. |
| ; |
| ; 9: The version of the ABI that corrects the alignment of nullptr_t. |
| ; First selectable and default in G++ 5.2. |
| ; |
| ; 10: The version of the ABI that mangles attributes that affect type |
| ; identity, such as ia32 calling convention attributes (stdcall, etc.) |
| ; Default in G++ 6 (set in c_common_post_options). |
| ; |
| ; 11: The version of the ABI that corrects mangling of sizeof... expressions |
| ; and introduces new inheriting constructor handling. |
| ; Default in G++ 7. |
| ; |
| ; 12: Corrects the calling convention for classes with only deleted copy/move |
| ; constructors and changes passing/returning of empty records. |
| ; Default in G++ 8.1. |
| ; |
| ; 13: Fixes the accidental change in 12 to the calling convention for classes |
| ; with deleted copy constructor and trivial move constructor. |
| ; Default in G++ 8.2. |
| ; |
| ; Additional positive integers will be assigned as new versions of |
| ; the ABI become the default version of the ABI. |
| fabi-version= |
| Common Joined RejectNegative UInteger Var(flag_abi_version) Init(0) |
| The version of the C++ ABI in use. |
| |
| faggressive-loop-optimizations |
| Common Report Var(flag_aggressive_loop_optimizations) Optimization Init(1) |
| Aggressively optimize loops using language constraints. |
| |
| falign-functions |
| Common Report Var(align_functions,0) Optimization UInteger |
| Align the start of functions. |
| |
| falign-functions= |
| Common RejectNegative Joined UInteger Var(align_functions) Optimization |
| |
| flimit-function-alignment |
| Common Report Var(flag_limit_function_alignment) Optimization Init(0) |
| |
| falign-jumps |
| Common Report Var(align_jumps,0) Optimization UInteger |
| Align labels which are only reached by jumping. |
| |
| falign-jumps= |
| Common RejectNegative Joined UInteger Var(align_jumps) Optimization |
| |
| falign-labels |
| Common Report Var(align_labels,0) Optimization UInteger |
| Align all labels. |
| |
| falign-labels= |
| Common RejectNegative Joined UInteger Var(align_labels) Optimization |
| |
| falign-loops |
| Common Report Var(align_loops,0) Optimization UInteger |
| Align the start of loops. |
| |
| falign-loops= |
| Common RejectNegative Joined UInteger Var(align_loops) Optimization |
| |
| fargument-alias |
| Common Ignore |
| Does nothing. Preserved for backward compatibility. |
| |
| fargument-noalias |
| Common Ignore |
| Does nothing. Preserved for backward compatibility. |
| |
| fargument-noalias-global |
| Common Ignore |
| Does nothing. Preserved for backward compatibility. |
| |
| fargument-noalias-anything |
| Common Ignore |
| Does nothing. Preserved for backward compatibility. |
| |
| fsanitize= |
| Common Driver Report Joined |
| Select what to sanitize. |
| |
| fsanitize-coverage= |
| Common Report Joined |
| Select type of coverage sanitization. |
| |
| fasan-shadow-offset= |
| Common Joined RejectNegative Var(common_deferred_options) Defer |
| -fasan-shadow-offset=<number> Use custom shadow memory offset. |
| |
| fsanitize-sections= |
| Common Joined RejectNegative Var(common_deferred_options) Defer |
| -fsanitize-sections=<sec1,sec2,...> Sanitize global variables |
| in user-defined sections. |
| |
| fsanitize-recover= |
| Common Report Joined |
| After diagnosing undefined behavior attempt to continue execution. |
| |
| fsanitize-recover |
| Common Report |
| This switch is deprecated; use -fsanitize-recover= instead. |
| |
| fsanitize-address-use-after-scope |
| Common Driver Report Var(flag_sanitize_address_use_after_scope) Init(0) |
| |
| fsanitize-undefined-trap-on-error |
| Common Driver Report Var(flag_sanitize_undefined_trap_on_error) Init(0) |
| Use trap instead of a library function for undefined behavior sanitization. |
| |
| fasynchronous-unwind-tables |
| Common Report Var(flag_asynchronous_unwind_tables) Optimization |
| Generate unwind tables that are exact at each instruction boundary. |
| |
| fauto-inc-dec |
| Common Report Var(flag_auto_inc_dec) Init(1) Optimization |
| Generate auto-inc/dec instructions. |
| |
| fauto-profile |
| Common Report Var(flag_auto_profile) |
| Use sample profile information for call graph node weights. The default |
| profile file is fbdata.afdo in 'pwd'. |
| |
| fauto-profile= |
| Common Joined RejectNegative Var(auto_profile_file) |
| Use sample profile information for call graph node weights. The profile |
| file is specified in the argument. |
| |
| ; -fcheck-bounds causes gcc to generate array bounds checks. |
| ; For C, C++ and ObjC: defaults off. |
| ; For Java: defaults to on. |
| ; For Fortran: defaults to off. |
| fbounds-check |
| Common Report Var(flag_bounds_check) |
| Generate code to check bounds before indexing arrays. |
| |
| fbranch-count-reg |
| Common Report Var(flag_branch_on_count_reg) Optimization |
| Replace add, compare, branch with branch on count register. |
| |
| fbranch-probabilities |
| Common Report Var(flag_branch_probabilities) Optimization |
| Use profiling information for branch probabilities. |
| |
| fbranch-target-load-optimize |
| Common Report Var(flag_branch_target_load_optimize) Optimization |
| Perform branch target load optimization before prologue / epilogue threading. |
| |
| fbranch-target-load-optimize2 |
| Common Report Var(flag_branch_target_load_optimize2) Optimization |
| Perform branch target load optimization after prologue / epilogue threading. |
| |
| fbtr-bb-exclusive |
| Common Report Var(flag_btr_bb_exclusive) Optimization |
| Restrict target load migration not to re-use registers in any basic block. |
| |
| fcall-saved- |
| Common Joined RejectNegative Var(common_deferred_options) Defer |
| -fcall-saved-<register> Mark <register> as being preserved across functions. |
| |
| fcall-used- |
| Common Joined RejectNegative Var(common_deferred_options) Defer |
| -fcall-used-<register> Mark <register> as being corrupted by function calls. |
| |
| ; Nonzero for -fcaller-saves: allocate values in regs that need to |
| ; be saved across function calls, if that produces overall better code. |
| ; Optional now, so people can test it. |
| fcaller-saves |
| Common Report Var(flag_caller_saves) Optimization |
| Save registers around function calls. |
| |
| fcheck-data-deps |
| Common Report Var(flag_check_data_deps) |
| This switch is deprecated; do not use. |
| |
| fcheck-new |
| Common Var(flag_check_new) |
| Check the return value of new in C++. |
| |
| fchecking |
| Common Var(flag_checking) Init(CHECKING_P ? ENABLE_EXTRA_CHECKING ? 2 : 1 : 0) |
| Perform internal consistency checkings. |
| |
| fchecking= |
| Common Joined RejectNegative UInteger Var(flag_checking) |
| Perform internal consistency checkings. |
| |
| fcode-hoisting |
| Common Report Var(flag_code_hoisting) Optimization |
| Enable code hoisting. |
| |
| fcombine-stack-adjustments |
| Common Report Var(flag_combine_stack_adjustments) Optimization |
| Looks for opportunities to reduce stack adjustments and stack references. |
| |
| fcommon |
| Common Report Var(flag_no_common,0) |
| Do not put uninitialized globals in the common section. |
| |
| fcompare-debug |
| Driver |
| ; Converted by the driver to -fcompare-debug= options. |
| |
| fcompare-debug= |
| Common Driver JoinedOrMissing RejectNegative Var(flag_compare_debug_opt) |
| -fcompare-debug[=<opts>] Compile with and without e.g. -gtoggle, and compare the final-insns dump. |
| |
| fcompare-debug-second |
| Common Driver RejectNegative Var(flag_compare_debug) |
| Run only the second compilation of -fcompare-debug. |
| |
| fcompare-elim |
| Common Report Var(flag_compare_elim_after_reload) Optimization |
| Perform comparison elimination after register allocation has finished. |
| |
| fconserve-stack |
| Common Var(flag_conserve_stack) Optimization |
| Do not perform optimizations increasing noticeably stack usage. |
| |
| fcprop-registers |
| Common Report Var(flag_cprop_registers) Optimization |
| Perform a register copy-propagation optimization pass. |
| |
| fcrossjumping |
| Common Report Var(flag_crossjumping) Optimization |
| Perform cross-jumping optimization. |
| |
| fcse-follow-jumps |
| Common Report Var(flag_cse_follow_jumps) Optimization |
| When running CSE, follow jumps to their targets. |
| |
| fcse-skip-blocks |
| Common Ignore |
| Does nothing. Preserved for backward compatibility. |
| |
| fcx-limited-range |
| Common Report Var(flag_cx_limited_range) Optimization SetByCombined |
| Omit range reduction step when performing complex division. |
| |
| fcx-fortran-rules |
| Common Report Var(flag_cx_fortran_rules) Optimization |
| Complex multiplication and division follow Fortran rules. |
| |
| fdata-sections |
| Common Report Var(flag_data_sections) |
| Place data items into their own section. |
| |
| fdbg-cnt-list |
| Common Report Var(common_deferred_options) Defer |
| List all available debugging counters with their limits and counts. |
| |
| fdbg-cnt= |
| Common RejectNegative Joined Var(common_deferred_options) Defer |
| -fdbg-cnt=<counter>:<limit>[,<counter>:<limit>,...] Set the debug counter limit. |
| |
| fdebug-prefix-map= |
| Common Joined RejectNegative Var(common_deferred_options) Defer |
| -fdebug-prefix-map=<old>=<new> Map one directory name to another in debug information. |
| |
| ffile-prefix-map= |
| Common Joined RejectNegative Var(common_deferred_options) Defer |
| -ffile-prefix-map=<old>=<new> Map one directory name to another in compilation result. |
| |
| fdebug-types-section |
| Common Report Var(flag_debug_types_section) Init(0) |
| Output .debug_types section when using DWARF v4 debuginfo. |
| |
| ; Nonzero for -fdefer-pop: don't pop args after each function call |
| ; instead save them up to pop many calls' args with one insns. |
| fdefer-pop |
| Common Report Var(flag_defer_pop) Optimization |
| Defer popping functions args from stack until later. |
| |
| fdelayed-branch |
| Common Report Var(flag_delayed_branch) Optimization |
| Attempt to fill delay slots of branch instructions. |
| |
| fdelete-dead-exceptions |
| Common Report Var(flag_delete_dead_exceptions) Init(0) Optimization |
| Delete dead instructions that may throw exceptions. |
| |
| fdelete-null-pointer-checks |
| Common Report Var(flag_delete_null_pointer_checks) Init(-1) Optimization |
| Delete useless null pointer checks. |
| |
| fdevirtualize-at-ltrans |
| Common Report Var(flag_ltrans_devirtualize) |
| Stream extra data to support more aggressive devirtualization in LTO local transformation mode. |
| |
| fdevirtualize-speculatively |
| Common Report Var(flag_devirtualize_speculatively) Optimization |
| Perform speculative devirtualization. |
| |
| fdevirtualize |
| Common Report Var(flag_devirtualize) Optimization |
| Try to convert virtual calls to direct ones. |
| |
| fdiagnostics-show-location= |
| Common Joined RejectNegative Enum(diagnostic_prefixing_rule) |
| -fdiagnostics-show-location=[once|every-line] How often to emit source location at the beginning of line-wrapped diagnostics. |
| |
| ; Required for these enum values. |
| SourceInclude |
| pretty-print.h |
| |
| Enum |
| Name(diagnostic_prefixing_rule) Type(int) |
| |
| EnumValue |
| Enum(diagnostic_prefixing_rule) String(once) Value(DIAGNOSTICS_SHOW_PREFIX_ONCE) |
| |
| EnumValue |
| Enum(diagnostic_prefixing_rule) String(every-line) Value(DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE) |
| |
| fdiagnostics-show-caret |
| Common Var(flag_diagnostics_show_caret) Init(1) |
| Show the source line with a caret indicating the column. |
| |
| fdiagnostics-color |
| Common Alias(fdiagnostics-color=,always,never) |
| ; |
| |
| fdiagnostics-color= |
| Driver Common Joined RejectNegative Var(flag_diagnostics_show_color) Enum(diagnostic_color_rule) Init(DIAGNOSTICS_COLOR_NO) |
| -fdiagnostics-color=[never|always|auto] Colorize diagnostics. |
| |
| ; Required for these enum values. |
| SourceInclude |
| diagnostic-color.h |
| |
| Enum |
| Name(diagnostic_color_rule) Type(int) |
| |
| EnumValue |
| Enum(diagnostic_color_rule) String(never) Value(DIAGNOSTICS_COLOR_NO) |
| |
| EnumValue |
| Enum(diagnostic_color_rule) String(always) Value(DIAGNOSTICS_COLOR_YES) |
| |
| EnumValue |
| Enum(diagnostic_color_rule) String(auto) Value(DIAGNOSTICS_COLOR_AUTO) |
| |
| fdiagnostics-parseable-fixits |
| Common Var(flag_diagnostics_parseable_fixits) |
| Print fix-it hints in machine-readable form. |
| |
| fdiagnostics-generate-patch |
| Common Var(flag_diagnostics_generate_patch) |
| Print fix-it hints to stderr in unified diff format. |
| |
| fdiagnostics-show-option |
| Common Var(flag_diagnostics_show_option) Init(1) |
| Amend appropriate diagnostic messages with the command line option that controls them. |
| |
| fdisable- |
| Common Joined RejectNegative Var(common_deferred_options) Defer |
| -fdisable-[tree|rtl|ipa]-<pass>=range1+range2 disables an optimization pass. |
| |
| fenable- |
| Common Joined RejectNegative Var(common_deferred_options) Defer |
| -fenable-[tree|rtl|ipa]-<pass>=range1+range2 enables an optimization pass. |
| |
| fdump- |
| Common Joined RejectNegative Var(common_deferred_options) Defer |
| -fdump-<type> Dump various compiler internals to a file. |
| |
| fdump-final-insns |
| Driver RejectNegative |
| |
| fdump-final-insns= |
| Common RejectNegative Joined Var(flag_dump_final_insns) |
| -fdump-final-insns=filename Dump to filename the insns at the end of translation. |
| |
| fdump-go-spec= |
| Common RejectNegative Joined Var(flag_dump_go_spec) |
| -fdump-go-spec=filename Write all declarations to file as Go code. |
| |
| fdump-noaddr |
| Common Report Var(flag_dump_noaddr) |
| Suppress output of addresses in debugging dumps. |
| |
| freport-bug |
| Common Driver Var(flag_report_bug) |
| Collect and dump debug information into temporary file if ICE in C/C++ |
| compiler occurred. |
| |
| fdump-internal-locations |
| Common Var(flag_dump_locations) Init(0) |
| Dump detailed information on GCC's internal representation of source code locations. |
| |
| fdump-passes |
| Common Var(flag_dump_passes) Init(0) |
| Dump optimization passes. |
| |
| fdump-unnumbered |
| Common Report Var(flag_dump_unnumbered) |
| Suppress output of instruction numbers, line number notes and addresses in debugging dumps. |
| |
| fdump-unnumbered-links |
| Common Report Var(flag_dump_unnumbered_links) |
| Suppress output of previous and next insn numbers in debugging dumps. |
| |
| fdwarf2-cfi-asm |
| Common Report Var(flag_dwarf2_cfi_asm) Init(HAVE_GAS_CFI_DIRECTIVE) |
| Enable CFI tables via GAS assembler directives. |
| |
| fearly-inlining |
| Common Report Var(flag_early_inlining) Init(1) Optimization |
| Perform early inlining. |
| |
| feliminate-dwarf2-dups |
| Common Ignore |
| Does nothing. Preserved for backward compatibility. |
| |
| fipa-sra |
| Common Report Var(flag_ipa_sra) Init(0) Optimization |
| Perform interprocedural reduction of aggregates. |
| |
| feliminate-unused-debug-symbols |
| Common Report Var(flag_debug_only_used_symbols) |
| Perform unused symbol elimination in debug info. |
| |
| feliminate-unused-debug-types |
| Common Report Var(flag_eliminate_unused_debug_types) Init(1) |
| Perform unused type elimination in debug info. |
| |
| femit-class-debug-always |
| Common Report Var(flag_emit_class_debug_always) Init(0) |
| Do not suppress C++ class debug information. |
| |
| fexceptions |
| Common Report Var(flag_exceptions) Optimization |
| Enable exception handling. |
| |
| fexpensive-optimizations |
| Common Report Var(flag_expensive_optimizations) Optimization |
| Perform a number of minor, expensive optimizations. |
| |
| fexcess-precision= |
| Common Joined RejectNegative Enum(excess_precision) Var(flag_excess_precision_cmdline) Init(EXCESS_PRECISION_DEFAULT) SetByCombined |
| -fexcess-precision=[fast|standard] Specify handling of excess floating-point precision. |
| |
| Enum |
| Name(excess_precision) Type(enum excess_precision) UnknownError(unknown excess precision style %qs) |
| |
| EnumValue |
| Enum(excess_precision) String(fast) Value(EXCESS_PRECISION_FAST) |
| |
| EnumValue |
| Enum(excess_precision) String(standard) Value(EXCESS_PRECISION_STANDARD) |
| |
| ; Whether we permit the extended set of values for FLT_EVAL_METHOD |
| ; introduced in ISO/IEC TS 18661-3, or limit ourselves to those in C99/C11. |
| fpermitted-flt-eval-methods= |
| Common Joined RejectNegative Enum(permitted_flt_eval_methods) Var(flag_permitted_flt_eval_methods) Init(PERMITTED_FLT_EVAL_METHODS_DEFAULT) |
| -fpermitted-flt-eval-methods=[c11|ts-18661] Specify which values of FLT_EVAL_METHOD are permitted. |
| |
| Enum |
| Name(permitted_flt_eval_methods) Type(enum permitted_flt_eval_methods) UnknownError(unknown specification for the set of FLT_EVAL_METHOD values to permit %qs) |
| |
| EnumValue |
| Enum(permitted_flt_eval_methods) String(c11) Value(PERMITTED_FLT_EVAL_METHODS_C11) |
| |
| EnumValue |
| Enum(permitted_flt_eval_methods) String(ts-18661-3) Value(PERMITTED_FLT_EVAL_METHODS_TS_18661) |
| |
| ffast-math |
| Common Optimization |
| |
| ffat-lto-objects |
| Common Var(flag_fat_lto_objects) |
| Output lto objects containing both the intermediate language and binary output. |
| |
| ffinite-math-only |
| Common Report Var(flag_finite_math_only) Optimization SetByCombined |
| Assume no NaNs or infinities are generated. |
| |
| ffixed- |
| Common Joined RejectNegative Var(common_deferred_options) Defer |
| -ffixed-<register> Mark <register> as being unavailable to the compiler. |
| |
| ffloat-store |
| Common Report Var(flag_float_store) Optimization |
| Don't allocate floats and doubles in extended-precision registers. |
| |
| fforce-addr |
| Common Ignore |
| Does nothing. Preserved for backward compatibility. |
| |
| fforward-propagate |
| Common Report Var(flag_forward_propagate) Optimization |
| Perform a forward propagation pass on RTL. |
| |
| ffp-contract= |
| Common Joined RejectNegative Enum(fp_contract_mode) Var(flag_fp_contract_mode) Init(FP_CONTRACT_FAST) Optimization |
| -ffp-contract=[off|on|fast] Perform floating-point expression contraction. |
| |
| Enum |
| Name(fp_contract_mode) Type(enum fp_contract_mode) UnknownError(unknown floating point contraction style %qs) |
| |
| EnumValue |
| Enum(fp_contract_mode) String(off) Value(FP_CONTRACT_OFF) |
| |
| ; Not implemented, fall back to conservative FP_CONTRACT_OFF. |
| EnumValue |
| Enum(fp_contract_mode) String(on) Value(FP_CONTRACT_OFF) |
| |
| EnumValue |
| Enum(fp_contract_mode) String(fast) Value(FP_CONTRACT_FAST) |
| |
| ffp-int-builtin-inexact |
| Common Report Var(flag_fp_int_builtin_inexact) Init(1) Optimization |
| Allow built-in functions ceil, floor, round, trunc to raise \"inexact\" exceptions. |
| |
| ; Nonzero means don't put addresses of constant functions in registers. |
| ; Used for compiling the Unix kernel, where strange substitutions are |
| ; done on the assembly output. |
| ffunction-cse |
| Common Report Var(flag_no_function_cse,0) Optimization |
| Allow function addresses to be held in registers. |
| |
| ffunction-sections |
| Common Report Var(flag_function_sections) |
| Place each function into its own section. |
| |
| fgcse |
| Common Report Var(flag_gcse) Optimization |
| Perform global common subexpression elimination. |
| |
| fgcse-lm |
| Common Report Var(flag_gcse_lm) Init(1) Optimization |
| Perform enhanced load motion during global common subexpression elimination. |
| |
| fgcse-sm |
| Common Report Var(flag_gcse_sm) Init(0) Optimization |
| Perform store motion after global common subexpression elimination. |
| |
| fgcse-las |
| Common Report Var(flag_gcse_las) Init(0) Optimization |
| Perform redundant load after store elimination in global common subexpression |
| elimination. |
| |
| fgcse-after-reload |
| Common Report Var(flag_gcse_after_reload) Optimization |
| Perform global common subexpression elimination after register allocation has |
| finished. |
| |
| Enum |
| Name(dwarf_gnat_encodings) Type(int) |
| |
| EnumValue |
| Enum(dwarf_gnat_encodings) String(all) Value(DWARF_GNAT_ENCODINGS_ALL) |
| |
| EnumValue |
| Enum(dwarf_gnat_encodings) String(gdb) Value(DWARF_GNAT_ENCODINGS_GDB) |
| |
| EnumValue |
| Enum(dwarf_gnat_encodings) String(minimal) Value(DWARF_GNAT_ENCODINGS_MINIMAL) |
| |
| fgnat-encodings= |
| Common Enum(dwarf_gnat_encodings) Joined RejectNegative Report Undocumented Var(gnat_encodings) |
| -fgnat-encodings=[all|gdb|minimal] Select the balance between GNAT encodings and standard DWARF emitted in the debug information |
| |
| ; This option is not documented yet as its semantics will change. |
| fgraphite |
| Common Report Var(flag_graphite) Optimization |
| Enable in and out of Graphite representation. |
| |
| fgraphite-identity |
| Common Report Var(flag_graphite_identity) Optimization |
| Enable Graphite Identity transformation. |
| |
| fhoist-adjacent-loads |
| Common Report Var(flag_hoist_adjacent_loads) Optimization |
| Enable hoisting adjacent loads to encourage generating conditional move |
| instructions. |
| |
| fkeep-gc-roots-live |
| Common Undocumented Report Var(flag_keep_gc_roots_live) Optimization |
| ; Always keep a pointer to a live memory block |
| |
| floop-parallelize-all |
| Common Report Var(flag_loop_parallelize_all) Optimization |
| Mark all loops as parallel. |
| |
| floop-strip-mine |
| Common Alias(floop-nest-optimize) |
| Enable loop nest transforms. Same as -floop-nest-optimize. |
| |
| floop-interchange |
| Common Report Var(flag_loop_interchange) Optimization |
| Enable loop interchange on trees. |
| |
| floop-block |
| Common Alias(floop-nest-optimize) |
| Enable loop nest transforms. Same as -floop-nest-optimize. |
| |
| floop-unroll-and-jam |
| Common Report Var(flag_unroll_jam) Optimization |
| Perform unroll-and-jam on loops. |
| |
| fgnu-tm |
| Common Report Var(flag_tm) |
| Enable support for GNU transactional memory. |
| |
| fgnu-unique |
| Common Report Var(flag_gnu_unique) Init(1) |
| Use STB_GNU_UNIQUE if supported by the assembler. |
| |
| floop-flatten |
| Common Ignore |
| Does nothing. Preserved for backward compatibility. |
| |
| floop-nest-optimize |
| Common Report Var(flag_loop_nest_optimize) Optimization |
| Enable the loop nest optimizer. |
| |
| fstrict-volatile-bitfields |
| Common Report Var(flag_strict_volatile_bitfields) Init(-1) Optimization |
| Force bitfield accesses to match their type width. |
| |
| fstore-merging |
| Common Report Var(flag_store_merging) Optimization |
| Merge adjacent stores. |
| |
| fguess-branch-probability |
| Common Report Var(flag_guess_branch_prob) Optimization |
| Enable guessing of branch probabilities. |
| |
| ; Nonzero means ignore `#ident' directives. 0 means handle them. |
| ; Generate position-independent code for executables if possible |
| ; On SVR4 targets, it also controls whether or not to emit a |
| ; string identifying the compiler. |
| fident |
| Common Report Var(flag_no_ident,0) |
| Process #ident directives. |
| |
| fif-conversion |
| Common Report Var(flag_if_conversion) Optimization |
| Perform conversion of conditional jumps to branchless equivalents. |
| |
| fif-conversion2 |
| Common Report Var(flag_if_conversion2) Optimization |
| Perform conversion of conditional jumps to conditional execution. |
| |
| fstack-reuse= |
| Common Joined RejectNegative Enum(stack_reuse_level) Var(flag_stack_reuse) Init(SR_ALL) Optimization |
| -fstack-reuse=[all|named_vars|none] Set stack reuse level for local variables. |
| |
| Enum |
| Name(stack_reuse_level) Type(enum stack_reuse_level) UnknownError(unknown Stack Reuse Level %qs) |
| |
| EnumValue |
| Enum(stack_reuse_level) String(all) Value(SR_ALL) |
| |
| EnumValue |
| Enum(stack_reuse_level) String(named_vars) Value(SR_NAMED_VARS) |
| |
| EnumValue |
| Enum(stack_reuse_level) String(none) Value(SR_NONE) |
| |
| ftree-loop-if-convert |
| Common Report Var(flag_tree_loop_if_convert) Init(-1) Optimization |
| Convert conditional jumps in innermost loops to branchless equivalents. |
| |
| ftree-loop-if-convert-stores |
| Common Ignore |
| Does nothing. Preserved for backward compatibility. |
| |
| ; -finhibit-size-directive inhibits output of .size for ELF. |
| ; This is used only for compiling crtstuff.c, |
| ; and it may be extended to other effects |
| ; needed for crtstuff.c on other systems. |
| finhibit-size-directive |
| Common Report Var(flag_inhibit_size_directive) |
| Do not generate .size directives. |
| |
| findirect-inlining |
| Common Report Var(flag_indirect_inlining) Optimization |
| Perform indirect inlining. |
| |
| ; General flag to enable inlining. Specifying -fno-inline will disable |
| ; all inlining apart from always-inline functions. |
| finline |
| Common Report Var(flag_no_inline,0) Init(0) Optimization |
| Enable inlining of function declared \"inline\", disabling disables all inlining. |
| |
| finline-small-functions |
| Common Report Var(flag_inline_small_functions) Optimization |
| Integrate functions into their callers when code size is known not to grow. |
| |
| finline-functions |
| Common Report Var(flag_inline_functions) Optimization |
| Integrate functions not declared \"inline\" into their callers when profitable. |
| |
| finline-functions-called-once |
| Common Report Var(flag_inline_functions_called_once) Optimization |
| Integrate functions only required by their single caller. |
| |
| finline-limit- |
| Common RejectNegative Joined Alias(finline-limit=) |
| |
| finline-limit= |
| Common RejectNegative Joined UInteger |
| -finline-limit=<number> Limit the size of inlined functions to <number>. |
| |
| finline-atomics |
| Common Report Var(flag_inline_atomics) Init(1) Optimization |
| Inline __atomic operations when a lock free instruction sequence is available. |
| |
| fcf-protection |
| Common RejectNegative Alias(fcf-protection=,full) |
| |
| fcf-protection= |
| Common Report Joined RejectNegative Enum(cf_protection_level) Var(flag_cf_protection) Init(CF_NONE) |
| -fcf-protection=[full|branch|return|none] Instrument functions with checks to verify jump/call/return control-flow transfer |
| instructions have valid targets. |
| |
| Enum |
| Name(cf_protection_level) Type(enum cf_protection_level) UnknownError(unknown Control-Flow Protection Level %qs) |
| |
| EnumValue |
| Enum(cf_protection_level) String(full) Value(CF_FULL) |
| |
| EnumValue |
| Enum(cf_protection_level) String(branch) Value(CF_BRANCH) |
| |
| EnumValue |
| Enum(cf_protection_level) String(return) Value(CF_RETURN) |
| |
| EnumValue |
| Enum(cf_protection_level) String(none) Value(CF_NONE) |
| |
| finstrument-functions |
| Common Report Var(flag_instrument_function_entry_exit) |
| Instrument function entry and exit with profiling calls. |
| |
| finstrument-functions-exclude-function-list= |
| Common RejectNegative Joined |
| -finstrument-functions-exclude-function-list=name,... Do not instrument listed functions. |
| |
| finstrument-functions-exclude-file-list= |
| Common RejectNegative Joined |
| -finstrument-functions-exclude-file-list=filename,... Do not instrument functions listed in files. |
| |
| fipa-cp |
| Common Report Var(flag_ipa_cp) Optimization |
| Perform interprocedural constant propagation. |
| |
| fipa-cp-clone |
| Common Report Var(flag_ipa_cp_clone) Optimization |
| Perform cloning to make Interprocedural constant propagation stronger. |
| |
| fipa-cp-alignment |
| Common Ignore |
| Does nothing. Preserved for backward compatibility. |
| |
| fipa-bit-cp |
| Common Report Var(flag_ipa_bit_cp) Optimization |
| Perform interprocedural bitwise constant propagation. |
| |
| fipa-profile |
| Common Report Var(flag_ipa_profile) Init(0) Optimization |
| Perform interprocedural profile propagation. |
| |
| fipa-pta |
| Common Report Var(flag_ipa_pta) Init(0) Optimization |
| Perform interprocedural points-to analysis. |
| |
| fipa-pure-const |
| Common Report Var(flag_ipa_pure_const) Init(0) Optimization |
| Discover pure and const functions. |
| |
| fipa-icf |
| Common Report Var(flag_ipa_icf) Optimization |
| Perform Identical Code Folding for functions and read-only variables. |
| |
| fipa-icf-functions |
| Common Report Var(flag_ipa_icf_functions) Optimization |
| Perform Identical Code Folding for functions. |
| |
| fipa-icf-variables |
| Common Report Var(flag_ipa_icf_variables) Optimization |
| Perform Identical Code Folding for variables. |
| |
| fipa-reference |
| Common Report Var(flag_ipa_reference) Init(0) Optimization |
| Discover readonly and non addressable static variables. |
| |
| fipa-matrix-reorg |
| Common Ignore |
| Does nothing. Preserved for backward compatibility. |
| |
| fipa-struct-reorg |
| Common Ignore |
| Does nothing. Preserved for backward compatibility. |
| |
| fipa-vrp |
| Common Report Var(flag_ipa_vrp) Optimization |
| Perform IPA Value Range Propagation. |
| |
| fira-algorithm= |
| Common Joined RejectNegative Enum(ira_algorithm) Var(flag_ira_algorithm) Init(IRA_ALGORITHM_CB) Optimization |
| -fira-algorithm=[CB|priority] Set the used IRA algorithm. |
| |
| Enum |
| Name(ira_algorithm) Type(enum ira_algorithm) UnknownError(unknown IRA algorithm %qs) |
| |
| EnumValue |
| Enum(ira_algorithm) String(CB) Value(IRA_ALGORITHM_CB) |
| |
| EnumValue |
| Enum(ira_algorithm) String(priority) Value(IRA_ALGORITHM_PRIORITY) |
| |
| fira-region= |
| Common Joined RejectNegative Enum(ira_region) Var(flag_ira_region) Init(IRA_REGION_AUTODETECT) Optimization |
| -fira-region=[one|all|mixed] Set regions for IRA. |
| |
| Enum |
| Name(ira_region) Type(enum ira_region) UnknownError(unknown IRA region %qs) |
| |
| EnumValue |
| Enum(ira_region) String(one) Value(IRA_REGION_ONE) |
| |
| EnumValue |
| Enum(ira_region) String(all) Value(IRA_REGION_ALL) |
| |
| EnumValue |
| Enum(ira_region) String(mixed) Value(IRA_REGION_MIXED) |
| |
| fira-hoist-pressure |
| Common Report Var(flag_ira_hoist_pressure) Init(1) Optimization |
| Use IRA based register pressure calculation |
| in RTL hoist optimizations. |
| |
| fira-loop-pressure |
| Common Report Var(flag_ira_loop_pressure) Optimization |
| Use IRA based register pressure calculation |
| in RTL loop optimizations. |
| |
| fira-share-save-slots |
| Common Report Var(flag_ira_share_save_slots) Init(1) Optimization |
| Share slots for saving different hard registers. |
| |
| fira-share-spill-slots |
| Common Report Var(flag_ira_share_spill_slots) Init(1) Optimization |
| Share stack slots for spilled pseudo-registers. |
| |
| fira-verbose= |
| Common RejectNegative Joined UInteger Var(flag_ira_verbose) Init(5) |
| -fira-verbose=<number> Control IRA's level of diagnostic messages. |
| |
| fivopts |
| Common Report Var(flag_ivopts) Init(1) Optimization |
| Optimize induction variables on trees. |
| |
| fjump-tables |
| Common Var(flag_jump_tables) Init(1) Optimization |
| Use jump tables for sufficiently large switch statements. |
| |
| fkeep-inline-functions |
| Common Report Var(flag_keep_inline_functions) |
| Generate code for functions even if they are fully inlined. |
| |
| fkeep-static-functions |
| Common Report Var(flag_keep_static_functions) |
| Generate code for static functions even if they are never called. |
| |
| fkeep-static-consts |
| Common Report Var(flag_keep_static_consts) Init(1) |
| Emit static const variables even if they are not used. |
| |
| fleading-underscore |
| Common Report Var(flag_leading_underscore) Init(-1) |
| Give external symbols a leading underscore. |
| |
| floop-optimize |
| Common Ignore |
| Does nothing. Preserved for backward compatibility. |
| |
| flra-remat |
| Common Report Var(flag_lra_remat) Optimization |
| Do CFG-sensitive rematerialization in LRA. |
| |
| flto |
| Common |
| Enable link-time optimization. |
| |
| flto= |
| Common RejectNegative Joined Var(flag_lto) |
| Link-time optimization with number of parallel jobs or jobserver. |
| |
| Enum |
| Name(lto_partition_model) Type(enum lto_partition_model) UnknownError(unknown LTO partitioning model %qs) |
| |
| EnumValue |
| Enum(lto_partition_model) String(none) Value(LTO_PARTITION_NONE) |
| |
| EnumValue |
| Enum(lto_partition_model) String(one) Value(LTO_PARTITION_ONE) |
| |
| EnumValue |
| Enum(lto_partition_model) String(balanced) Value(LTO_PARTITION_BALANCED) |
| |
| EnumValue |
| Enum(lto_partition_model) String(1to1) Value(LTO_PARTITION_1TO1) |
| |
| EnumValue |
| Enum(lto_partition_model) String(max) Value(LTO_PARTITION_MAX) |
| |
| flto-partition= |
| Common Joined RejectNegative Enum(lto_partition_model) Var(flag_lto_partition) Init(LTO_PARTITION_BALANCED) |
| Specify the algorithm to partition symbols and vars at linktime. |
| |
| ; The initial value of -1 comes from Z_DEFAULT_COMPRESSION in zlib.h. |
| flto-compression-level= |
| Common Joined RejectNegative UInteger Var(flag_lto_compression_level) Init(-1) IntegerRange(0, 9) |
| -flto-compression-level=<number> Use zlib compression level <number> for IL. |
| |
| flto-odr-type-merging |
| Common Report Var(flag_lto_odr_type_mering) Init(1) |
| Merge C++ types using One Definition Rule. |
| |
| flto-report |
| Common Report Var(flag_lto_report) Init(0) |
| Report various link-time optimization statistics. |
| |
| flto-report-wpa |
| Common Report Var(flag_lto_report_wpa) Init(0) |
| Report various link-time optimization statistics for WPA only. |
| |
| fmath-errno |
| Common Report Var(flag_errno_math) Init(1) Optimization SetByCombined |
| Set errno after built-in math functions. |
| |
| fmax-errors= |
| Common Joined RejectNegative UInteger Var(flag_max_errors) |
| -fmax-errors=<number> Maximum number of errors to report. |
| |
| fmem-report |
| Common Report Var(mem_report) |
| Report on permanent memory allocation. |
| |
| fmem-report-wpa |
| Common Report Var(mem_report_wpa) |
| Report on permanent memory allocation in WPA only. |
| |
| ; This will attempt to merge constant section constants, if 1 only |
| ; string constants and constants from constant pool, if 2 also constant |
| ; variables. |
| fmerge-all-constants |
| Common Report Var(flag_merge_constants,2) Init(1) |
| Attempt to merge identical constants and constant variables. |
| |
| fmerge-constants |
| Common Report Var(flag_merge_constants,1) |
| Attempt to merge identical constants across compilation units. |
| |
| fmerge-debug-strings |
| Common Report Var(flag_merge_debug_strings) Init(1) |
| Attempt to merge identical debug strings across compilation units. |
| |
| fmessage-length= |
| Common RejectNegative Joined UInteger |
| -fmessage-length=<number> Limit diagnostics to <number> characters per line. 0 suppresses line-wrapping. |
| |
| fmodulo-sched |
| Common Report Var(flag_modulo_sched) Optimization |
| Perform SMS based modulo scheduling before the first scheduling pass. |
| |
| fmodulo-sched-allow-regmoves |
| Common Report Var(flag_modulo_sched_allow_regmoves) Optimization |
| Perform SMS based modulo scheduling with register moves allowed. |
| |
| fmove-loop-invariants |
| Common Report Var(flag_move_loop_invariants) Optimization |
| Move loop invariant computations out of loops. |
| |
| fdce |
| Common Var(flag_dce) Init(1) Optimization |
| Use the RTL dead code elimination pass. |
| |
| fdse |
| Common Var(flag_dse) Init(1) Optimization |
| Use the RTL dead store elimination pass. |
| |
| freschedule-modulo-scheduled-loops |
| Common Report Var(flag_resched_modulo_sched) Optimization |
| Enable/Disable the traditional scheduling in loops that already passed modulo scheduling. |
| |
| fnon-call-exceptions |
| Common Report Var(flag_non_call_exceptions) Optimization |
| Support synchronous non-call exceptions. |
| |
| foffload= |
| Common Driver Joined MissingArgError(options or targets missing after %qs) |
| -foffload=<targets>=<options> Specify offloading targets and options for them. |
| |
| foffload-abi= |
| Common Joined RejectNegative Enum(offload_abi) Var(flag_offload_abi) Init(OFFLOAD_ABI_UNSET) |
| -foffload-abi=[lp64|ilp32] Set the ABI to use in an offload compiler. |
| |
| Enum |
| Name(offload_abi) Type(enum offload_abi) UnknownError(unknown offload ABI %qs) |
| |
| EnumValue |
| Enum(offload_abi) String(ilp32) Value(OFFLOAD_ABI_ILP32) |
| |
| EnumValue |
| Enum(offload_abi) String(lp64) Value(OFFLOAD_ABI_LP64) |
| |
| fomit-frame-pointer |
| Common Report Var(flag_omit_frame_pointer) Optimization |
| When possible do not generate stack frames. |
| |
| fopt-info |
| Common Report Var(flag_opt_info) Optimization |
| Enable all optimization info dumps on stderr. |
| |
| fopt-info- |
| Common Joined RejectNegative Var(common_deferred_options) Defer |
| -fopt-info[-<type>=filename] Dump compiler optimization details. |
| |
| foptimize-register-move |
| Common Ignore |
| Does nothing. Preserved for backward compatibility. |
| |
| foptimize-sibling-calls |
| Common Report Var(flag_optimize_sibling_calls) Optimization |
| Optimize sibling and tail recursive calls. |
| |
| fpartial-inlining |
| Common Report Var(flag_partial_inlining) Optimization |
| Perform partial inlining. |
| |
| fpre-ipa-mem-report |
| Common Report Var(pre_ipa_mem_report) |
| Report on memory allocation before interprocedural optimization. |
| |
| fpost-ipa-mem-report |
| Common Report Var(post_ipa_mem_report) |
| Report on memory allocation before interprocedural optimization. |
| |
| fpack-struct |
| Common Report Var(flag_pack_struct) Optimization |
| Pack structure members together without holes. |
| |
| fpack-struct= |
| Common RejectNegative Joined UInteger Optimization |
| -fpack-struct=<number> Set initial maximum structure member alignment. |
| |
| fpcc-struct-return |
| Common Report Var(flag_pcc_struct_return,1) Init(DEFAULT_PCC_STRUCT_RETURN) |
| Return small aggregates in memory, not registers. |
| |
| fpeel-loops |
| Common Report Var(flag_peel_loops) Optimization |
| Perform loop peeling. |
| |
| fpeephole |
| Common Report Var(flag_no_peephole,0) Optimization |
| Enable machine specific peephole optimizations. |
| |
| fpeephole2 |
| Common Report Var(flag_peephole2) Optimization |
| Enable an RTL peephole pass before sched2. |
| |
| fPIC |
| Common Report Var(flag_pic,2) Negative(fPIE) Init(-1) |
| Generate position-independent code if possible (large mode). |
| |
| fPIE |
| Common Report Var(flag_pie,2) Negative(fpic) Init(-1) |
| Generate position-independent code for executables if possible (large mode). |
| |
| fpic |
| Common Report Var(flag_pic,1) Negative(fpie) Init(-1) |
| Generate position-independent code if possible (small mode). |
| |
| fpie |
| Common Report Var(flag_pie,1) Negative(fPIC) Init(-1) |
| Generate position-independent code for executables if possible (small mode). |
| |
| fplt |
| Common Report Var(flag_plt) Init(1) Optimization |
| Use PLT for PIC calls (-fno-plt: load the address from GOT at call site). |
| |
| fplugin= |
| Common Joined RejectNegative Var(common_deferred_options) Defer |
| Specify a plugin to load. |
| |
| fplugin-arg- |
| Common Joined RejectNegative Var(common_deferred_options) Defer |
| -fplugin-arg-<name>-<key>[=<value>] Specify argument <key>=<value> for plugin <name>. |
| |
| fpredictive-commoning |
| Common Report Var(flag_predictive_commoning) Optimization |
| Run predictive commoning optimization. |
| |
| fprefetch-loop-arrays |
| Common Report Var(flag_prefetch_loop_arrays) Init(-1) Optimization |
| Generate prefetch instructions, if available, for arrays in loops. |
| |
| fprofile |
| Common Report Var(profile_flag) |
| Enable basic program profiling code. |
| |
| fprofile-abs-path |
| Common Report Var(profile_abs_path_flag) |
| Generate absolute source path names for gcov. |
| |
| fprofile-arcs |
| Common Report Var(profile_arc_flag) |
| Insert arc-based program profiling code. |
| |
| fprofile-dir= |
| Common Joined RejectNegative Var(profile_data_prefix) |
| Set the top-level directory for storing the profile data. |
| The default is 'pwd'. |
| |
| fprofile-correction |
| Common Report Var(flag_profile_correction) |
| Enable correction of flow inconsistent profile data input. |
| |
| fprofile-update= |
| Common Joined RejectNegative Enum(profile_update) Var(flag_profile_update) Init(PROFILE_UPDATE_SINGLE) |
| -fprofile-update=[single|atomic|prefer-atomic] Set the profile update method. |
| |
| Enum |
| Name(profile_update) Type(enum profile_update) UnknownError(unknown profile update method %qs) |
| |
| EnumValue |
| Enum(profile_update) String(single) Value(PROFILE_UPDATE_SINGLE) |
| |
| EnumValue |
| Enum(profile_update) String(atomic) Value(PROFILE_UPDATE_ATOMIC) |
| |
| EnumValue |
| Enum(profile_update) String(prefer-atomic) Value(PROFILE_UPDATE_PREFER_ATOMIC) |
| |
| fprofile-generate |
| Common |
| Enable common options for generating profile info for profile feedback directed optimizations. |
| |
| fprofile-generate= |
| Common Joined RejectNegative |
| Enable common options for generating profile info for profile feedback directed optimizations, and set -fprofile-dir=. |
| |
| fprofile-use |
| Common Var(flag_profile_use) |
| Enable common options for performing profile feedback directed optimizations. |
| |
| fprofile-use= |
| Common Joined RejectNegative |
| Enable common options for performing profile feedback directed optimizations, and set -fprofile-dir=. |
| |
| fprofile-values |
| Common Report Var(flag_profile_values) |
| Insert code to profile values of expressions. |
| |
| fprofile-report |
| Common Report Var(profile_report) |
| Report on consistency of profile. |
| |
| fprofile-reorder-functions |
| Common Report Var(flag_profile_reorder_functions) |
| Enable function reordering that improves code placement. |
| |
| fpatchable-function-entry= |
| Common Joined Optimization |
| Insert NOP instructions at each function entry. |
| |
| frandom-seed |
| Common Var(common_deferred_options) Defer |
| |
| frandom-seed= |
| Common Joined RejectNegative Var(common_deferred_options) Defer |
| -frandom-seed=<string> Make compile reproducible using <string>. |
| |
| ; This switch causes the command line that was used to create an |
| ; object file to be recorded into the object file. The exact format |
| ; of this recording is target and binary file format dependent. |
| ; It is related to the -fverbose-asm switch, but that switch only |
| ; records information in the assembler output file as comments, so |
| ; they never reach the object file. |
| frecord-gcc-switches |
| Common Report Var(flag_record_gcc_switches) |
| Record gcc command line switches in the object file. |
| |
| freg-struct-return |
| Common Report Var(flag_pcc_struct_return,0) Optimization |
| Return small aggregates in registers. |
| |
| fregmove |
| Common Ignore |
| Does nothing. Preserved for backward compatibility. |
| |
| flifetime-dse |
| Common Report Var(flag_lifetime_dse,2) Init(2) Optimization |
| Tell DSE that the storage for a C++ object is dead when the constructor |
| starts and when the destructor finishes. |
| |
| flifetime-dse= |
| Common Joined RejectNegative UInteger Var(flag_lifetime_dse) Optimization IntegerRange(0, 2) |
| |
| flive-range-shrinkage |
| Common Report Var(flag_live_range_shrinkage) Init(0) Optimization |
| Relief of register pressure through live range shrinkage. |
| |
| frename-registers |
| Common Report Var(flag_rename_registers) Init(2) Optimization |
| Perform a register renaming optimization pass. |
| |
| fschedule-fusion |
| Common Report Var(flag_schedule_fusion) Init(2) Optimization |
| Perform a target dependent instruction fusion optimization pass. |
| |
| freorder-blocks |
| Common Report Var(flag_reorder_blocks) Optimization |
| Reorder basic blocks to improve code placement. |
| |
| freorder-blocks-algorithm= |
| Common Joined RejectNegative Enum(reorder_blocks_algorithm) Var(flag_reorder_blocks_algorithm) Init(REORDER_BLOCKS_ALGORITHM_SIMPLE) Optimization |
| -freorder-blocks-algorithm=[simple|stc] Set the used basic block reordering algorithm. |
| |
| Enum |
| Name(reorder_blocks_algorithm) Type(enum reorder_blocks_algorithm) UnknownError(unknown basic block reordering algorithm %qs) |
| |
| EnumValue |
| Enum(reorder_blocks_algorithm) String(simple) Value(REORDER_BLOCKS_ALGORITHM_SIMPLE) |
| |
| EnumValue |
| Enum(reorder_blocks_algorithm) String(stc) Value(REORDER_BLOCKS_ALGORITHM_STC) |
| |
| freorder-blocks-and-partition |
| Common Report Var(flag_reorder_blocks_and_partition) Optimization |
| Reorder basic blocks and partition into hot and cold sections. |
| |
| freorder-functions |
| Common Report Var(flag_reorder_functions) Optimization |
| Reorder functions to improve code placement. |
| |
| frerun-cse-after-loop |
| Common Report Var(flag_rerun_cse_after_loop) Optimization |
| Add a common subexpression elimination pass after loop optimizations. |
| |
| frerun-loop-opt |
| Common Ignore |
| Does nothing. Preserved for backward compatibility. |
| |
| frounding-math |
| Common Report Var(flag_rounding_math) Optimization SetByCombined |
| Disable optimizations that assume default FP rounding behavior. |
| |
| fsched-interblock |
| Common Report Var(flag_schedule_interblock) Init(1) Optimization |
| Enable scheduling across basic blocks. |
| |
| fsched-pressure |
| Common Report Var(flag_sched_pressure) Init(0) Optimization |
| Enable register pressure sensitive insn scheduling. |
| |
| fsched-spec |
| Common Report Var(flag_schedule_speculative) Init(1) Optimization |
| Allow speculative motion of non-loads. |
| |
| fsched-spec-load |
| Common Report Var(flag_schedule_speculative_load) Optimization |
| Allow speculative motion of some loads. |
| |
| fsched-spec-load-dangerous |
| Common Report Var(flag_schedule_speculative_load_dangerous) Optimization |
| Allow speculative motion of more loads. |
| |
| fsched-verbose= |
| Common RejectNegative Joined UInteger Var(sched_verbose_param) Init(1) |
| -fsched-verbose=<number> Set the verbosity level of the scheduler. |
| |
| fsched2-use-superblocks |
| Common Report Var(flag_sched2_use_superblocks) Optimization |
| If scheduling post reload, do superblock scheduling. |
| |
| fsched2-use-traces |
| Common Ignore |
| Does nothing. Preserved for backward compatibility. |
| |
| fschedule-insns |
| Common Report Var(flag_schedule_insns) Optimization |
| Reschedule instructions before register allocation. |
| |
| fschedule-insns2 |
| Common Report Var(flag_schedule_insns_after_reload) Optimization |
| Reschedule instructions after register allocation. |
| |
| ; This flag should be on when a target implements non-trivial |
| ; scheduling hooks, maybe saving some information for its own sake. |
| ; On IA64, for example, this is used for correct bundling. |
| fselective-scheduling |
| Common Report Var(flag_selective_scheduling) Optimization |
| Schedule instructions using selective scheduling algorithm. |
| |
| fselective-scheduling2 |
| Common Report Var(flag_selective_scheduling2) Optimization |
| Run selective scheduling after reload. |
| |
| fself-test= |
| Common Undocumented Joined Var(flag_self_test) |
| Run self-tests, using the given path to locate test files. |
| |
| fsel-sched-pipelining |
| Common Report Var(flag_sel_sched_pipelining) Init(0) Optimization |
| Perform software pipelining of inner loops during selective scheduling. |
| |
| fsel-sched-pipelining-outer-loops |
| Common Report Var(flag_sel_sched_pipelining_outer_loops) Init(0) Optimization |
| Perform software pipelining of outer loops during selective scheduling. |
| |
| fsel-sched-reschedule-pipelined |
| Common Report Var(flag_sel_sched_reschedule_pipelined) Init(0) Optimization |
| Reschedule pipelined regions without pipelining. |
| |
| fsemantic-interposition |
| Common Report Var(flag_semantic_interposition) Init(1) |
| Allow interposing function (or variables) by ones with different semantics (or initializer) respectively by dynamic linker. |
| |
| ; sched_stalled_insns means that insns can be moved prematurely from the queue |
| ; of stalled insns into the ready list. |
| fsched-stalled-insns |
| Common Report Var(flag_sched_stalled_insns) Optimization UInteger |
| Allow premature scheduling of queued insns. |
| |
| fsched-stalled-insns= |
| Common RejectNegative Joined UInteger Optimization |
| -fsched-stalled-insns=<number> Set number of queued insns that can be prematurely scheduled. |
| |
| ; sched_stalled_insns_dep controls how many recently scheduled cycles will |
| ; be examined for a dependency on a stalled insn that is candidate for |
| ; premature removal from the queue of stalled insns into the ready list (has |
| ; an effect only if the flag 'sched_stalled_insns' is set). |
| fsched-stalled-insns-dep |
| Common Report Var(flag_sched_stalled_insns_dep,1) Init(1) Optimization UInteger |
| Set dependence distance checking in premature scheduling of queued insns. |
| |
| fsched-stalled-insns-dep= |
| Common RejectNegative Joined UInteger Optimization |
| -fsched-stalled-insns-dep=<number> Set dependence distance checking in premature scheduling of queued insns. |
| |
| fsched-group-heuristic |
| Common Report Var(flag_sched_group_heuristic) Init(1) Optimization |
| Enable the group heuristic in the scheduler. |
| |
| fsched-critical-path-heuristic |
| Common Report Var(flag_sched_critical_path_heuristic) Init(1) Optimization |
| Enable the critical path heuristic in the scheduler. |
| |
| fsched-spec-insn-heuristic |
| Common Report Var(flag_sched_spec_insn_heuristic) Init(1) Optimization |
| Enable the speculative instruction heuristic in the scheduler. |
| |
| fsched-rank-heuristic |
| Common Report Var(flag_sched_rank_heuristic) Init(1) Optimization |
| Enable the rank heuristic in the scheduler. |
| |
| fsched-last-insn-heuristic |
| Common Report Var(flag_sched_last_insn_heuristic) Init(1) Optimization |
| Enable the last instruction heuristic in the scheduler. |
| |
| fsched-dep-count-heuristic |
| Common Report Var(flag_sched_dep_count_heuristic) Init(1) Optimization |
| Enable the dependent count heuristic in the scheduler. |
| |
| fsection-anchors |
| Common Report Var(flag_section_anchors) Optimization |
| Access data in the same section from shared anchor points. |
| |
| fsee |
| Common Ignore |
| Does nothing. Preserved for backward compatibility. |
| |
| fzee |
| Common Ignore |
| Does nothing. Preserved for backward compatibility. |
| |
| free |
| Common Report Var(flag_ree) Init(0) |
| Turn on Redundant Extensions Elimination pass. |
| |
| fshow-column |
| Common Report Var(flag_show_column) Init(1) |
| Show column numbers in diagnostics, when available. Default on. |
| |
| fshrink-wrap |
| Common Report Var(flag_shrink_wrap) Optimization |
| Emit function prologues only before parts of the function that need it, |
| rather than at the top of the function. |
| |
| fshrink-wrap-separate |
| Common Report Var(flag_shrink_wrap_separate) Init(1) Optimization |
| Shrink-wrap parts of the prologue and epilogue separately. |
| |
| fsignaling-nans |
| Common Report Var(flag_signaling_nans) Optimization SetByCombined |
| Disable optimizations observable by IEEE signaling NaNs. |
| |
| fsigned-zeros |
| Common Report Var(flag_signed_zeros) Init(1) Optimization SetByCombined |
| Disable floating point optimizations that ignore the IEEE signedness of zero. |
| |
| fsingle-precision-constant |
| Common Report Var(flag_single_precision_constant) Optimization |
| Convert floating point constants to single precision constants. |
| |
| fsplit-ivs-in-unroller |
| Common Report Var(flag_split_ivs_in_unroller) Init(1) Optimization |
| Split lifetimes of induction variables when loops are unrolled. |
| |
| fsplit-stack |
| Common Report Var(flag_split_stack) Init(-1) |
| Generate discontiguous stack frames. |
| |
| fsplit-wide-types |
| Common Report Var(flag_split_wide_types) Optimization |
| Split wide types into independent registers. |
| |
| fssa-backprop |
| Common Report Var(flag_ssa_backprop) Init(1) Optimization |
| Enable backward propagation of use properties at the SSA level. |
| |
| fssa-phiopt |
| Common Report Var(flag_ssa_phiopt) Optimization |
| Optimize conditional patterns using SSA PHI nodes. |
| |
| fstdarg-opt |
| Common Report Var(flag_stdarg_opt) Init(1) Optimization |
| Optimize amount of stdarg registers saved to stack at start of function. |
| |
| fvariable-expansion-in-unroller |
| Common Report Var(flag_variable_expansion_in_unroller) Optimization |
| Apply variable expansion when loops are unrolled. |
| |
| fstack-check= |
| Common Report RejectNegative Joined Optimization |
| -fstack-check=[no|generic|specific] Insert stack checking code into the program. |
| |
| fstack-check |
| Common Alias(fstack-check=, specific, no) |
| Insert stack checking code into the program. Same as -fstack-check=specific. |
| |
| fstack-clash-protection |
| Common Report Var(flag_stack_clash_protection) Optimization |
| Insert code to probe each page of stack space as it is allocated to protect |
| from stack-clash style attacks. |
| |
| fstack-limit |
| Common Var(common_deferred_options) Defer |
| |
| fstack-limit-register= |
| Common RejectNegative Joined Var(common_deferred_options) Defer |
| -fstack-limit-register=<register> Trap if the stack goes past <register>. |
| |
| fstack-limit-symbol= |
| Common RejectNegative Joined Var(common_deferred_options) Defer |
| -fstack-limit-symbol=<name> Trap if the stack goes past symbol <name>. |
| |
| fstack-protector |
| Common Report Var(flag_stack_protect, 1) Init(-1) Optimization |
| Use propolice as a stack protection method. |
| |
| fstack-protector-all |
| Common Report RejectNegative Var(flag_stack_protect, 2) Init(-1) Optimization |
| Use a stack protection method for every function. |
| |
| fstack-protector-strong |
| Common Report RejectNegative Var(flag_stack_protect, 3) Init(-1) Optimization |
| Use a smart stack protection method for certain functions. |
| |
| fstack-protector-explicit |
| Common Report RejectNegative Var(flag_stack_protect, 4) Optimization |
| Use stack protection method only for functions with the stack_protect attribute. |
| |
| fstack-usage |
| Common RejectNegative Var(flag_stack_usage) |
| Output stack usage information on a per-function basis. |
| |
| fstrength-reduce |
| Common Ignore |
| Does nothing. Preserved for backward compatibility. |
| |
| ; Nonzero if we should do (language-dependent) alias analysis. |
| ; Typically, this analysis will assume that expressions of certain |
| ; types do not alias expressions of certain other types. Only used |
| ; if alias analysis (in general) is enabled. |
| fstrict-aliasing |
| Common Report Var(flag_strict_aliasing) Optimization |
| Assume strict aliasing rules apply. |
| |
| fstrict-overflow |
| Common Report |
| Treat signed overflow as undefined. Negated as -fwrapv -fwrapv-pointer. |
| |
| fsync-libcalls |
| Common Report Var(flag_sync_libcalls) Init(1) |
| Implement __atomic operations via libcalls to legacy __sync functions. |
| |
| fsyntax-only |
| Common Report Var(flag_syntax_only) |
| Check for syntax errors, then stop. |
| |
| ftest-coverage |
| Common Report Var(flag_test_coverage) |
| Create data files needed by \"gcov\". |
| |
| fthread-jumps |
| Common Report Var(flag_thread_jumps) Optimization |
| Perform jump threading optimizations. |
| |
| ftime-report |
| Common Report Var(time_report) |
| Report the time taken by each compiler pass. |
| |
| ftime-report-details |
| Common Report Var(time_report_details) |
| Record times taken by sub-phases separately. |
| |
| ftls-model= |
| Common Joined RejectNegative Enum(tls_model) Var(flag_tls_default) Init(TLS_MODEL_GLOBAL_DYNAMIC) |
| -ftls-model=[global-dynamic|local-dynamic|initial-exec|local-exec] Set the default thread-local storage code generation model. |
| |
| Enum |
| Name(tls_model) Type(enum tls_model) UnknownError(unknown TLS model %qs) |
| |
| EnumValue |
| Enum(tls_model) String(global-dynamic) Value(TLS_MODEL_GLOBAL_DYNAMIC) |
| |
| EnumValue |
| Enum(tls_model) String(local-dynamic) Value(TLS_MODEL_LOCAL_DYNAMIC) |
| |
| EnumValue |
| Enum(tls_model) String(initial-exec) Value(TLS_MODEL_INITIAL_EXEC) |
| |
| EnumValue |
| Enum(tls_model) String(local-exec) Value(TLS_MODEL_LOCAL_EXEC) |
| |
| ftoplevel-reorder |
| Common Report Var(flag_toplevel_reorder) Init(2) |
| Reorder top level functions, variables, and asms. |
| |
| ftracer |
| Common Report Var(flag_tracer) Optimization |
| Perform superblock formation via tail duplication. |
| |
| ftrampolines |
| Common Report Var(flag_trampolines) Init(0) |
| For targets that normally need trampolines for nested functions, always |
| generate them instead of using descriptors. |
| |
| ; Zero means that floating-point math operations cannot generate a |
| ; (user-visible) trap. This is the case, for example, in nonstop |
| ; IEEE 754 arithmetic. |
| ftrapping-math |
| Common Report Var(flag_trapping_math) Init(1) Optimization SetByCombined |
| Assume floating-point operations can trap. |
| |
| ftrapv |
| Common Report Var(flag_trapv) Optimization |
| Trap for signed overflow in addition, subtraction and multiplication. |
| |
| ftree-ccp |
| Common Report Var(flag_tree_ccp) Optimization |
| Enable SSA-CCP optimization on trees. |
| |
| ftree-bit-ccp |
| Common Report Var(flag_tree_bit_ccp) Optimization |
| Enable SSA-BIT-CCP optimization on trees. |
| |
| ftree-store-ccp |
| Common Ignore |
| Does nothing. Preserved for backward compatibility. |
| |
| ftree-ch |
| Common Report Var(flag_tree_ch) Optimization |
| Enable loop header copying on trees. |
| |
| ftree-coalesce-inlined-vars |
| Common Ignore RejectNegative |
| Does nothing. Preserved for backward compatibility. |
| |
| ftree-coalesce-vars |
| Common Report Var(flag_tree_coalesce_vars) Optimization |
| Enable SSA coalescing of user variables. |
| |
| ftree-copyrename |
| Common Ignore |
| Does nothing. Preserved for backward compatibility. |
| |
| ftree-copy-prop |
| Common Report Var(flag_tree_copy_prop) Optimization |
| Enable copy propagation on trees. |
| |
| ftree-store-copy-prop |
| Common Ignore |
| Does nothing. Preserved for backward compatibility. |
| |
| ftree-cselim |
| Common Report Var(flag_tree_cselim) Init(2) Optimization |
| Transform condition stores into unconditional ones. |
| |
| ftree-switch-conversion |
| Common Report Var(flag_tree_switch_conversion) Optimization |
| Perform conversions of switch initializations. |
| |
| ftree-dce |
| Common Report Var(flag_tree_dce) Optimization |
| Enable SSA dead code elimination optimization on trees. |
| |
| ftree-dominator-opts |
| Common Report Var(flag_tree_dom) Optimization |
| Enable dominator optimizations. |
| |
| ftree-tail-merge |
| Common Report Var(flag_tree_tail_merge) Optimization |
| Enable tail merging on trees. |
| |
| ftree-dse |
| Common Report Var(flag_tree_dse) Optimization |
| Enable dead store elimination. |
| |
| ftree-forwprop |
| Common Report Var(flag_tree_forwprop) Init(1) Optimization |
| Enable forward propagation on trees. |
| |
| ftree-fre |
| Common Report Var(flag_tree_fre) Optimization |
| Enable Full Redundancy Elimination (FRE) on trees. |
| |
| foptimize-strlen |
| Common Report Var(flag_optimize_strlen) Optimization |
| Enable string length optimizations on trees. |
| |
| fisolate-erroneous-paths-dereference |
| Common Report Var(flag_isolate_erroneous_paths_dereference) Optimization |
| Detect paths that trigger erroneous or undefined behavior due to |
| dereferencing a null pointer. Isolate those paths from the main control |
| flow and turn the statement with erroneous or undefined behavior into a trap. |
| |
| fisolate-erroneous-paths-attribute |
| Common Report Var(flag_isolate_erroneous_paths_attribute) Optimization |
| Detect paths that trigger erroneous or undefined behavior due to a null value |
| being used in a way forbidden by a returns_nonnull or nonnull |
| attribute. Isolate those paths from the main control flow and turn the |
| statement with erroneous or undefined behavior into a trap. |
| |
| ftree-loop-distribution |
| Common Report Var(flag_tree_loop_distribution) Optimization |
| Enable loop distribution on trees. |
| |
| ftree-loop-distribute-patterns |
| Common Report Var(flag_tree_loop_distribute_patterns) Optimization |
| Enable loop distribution for patterns transformed into a library call. |
| |
| ftree-loop-im |
| Common Report Var(flag_tree_loop_im) Init(1) Optimization |
| Enable loop invariant motion on trees. |
| |
| ftree-loop-linear |
| Common Alias(floop-nest-optimize) |
| Enable loop nest transforms. Same as -floop-nest-optimize. |
| |
| ftree-loop-ivcanon |
| Common Report Var(flag_tree_loop_ivcanon) Init(1) Optimization |
| Create canonical induction variables in loops. |
| |
| ftree-loop-optimize |
| Common Report Var(flag_tree_loop_optimize) Init(1) Optimization |
| Enable loop optimizations on tree level. |
| |
| ftree-parallelize-loops= |
| Common Report Joined RejectNegative UInteger Var(flag_tree_parallelize_loops) Init(1) Optimization |
| -ftree-parallelize-loops=<number> Enable automatic parallelization of loops. |
| |
| ftree-phiprop |
| Common Report Var(flag_tree_phiprop) Init(1) Optimization |
| Enable hoisting loads from conditional pointers. |
| |
| ftree-pre |
| Common Report Var(flag_tree_pre) Optimization |
| Enable SSA-PRE optimization on trees. |
| |
| ftree-partial-pre |
| Common Report Var(flag_tree_partial_pre) Optimization |
| In SSA-PRE optimization on trees, enable partial-partial redundancy elimination. |
| |
| ftree-pta |
| Common Report Var(flag_tree_pta) Optimization |
| Perform function-local points-to analysis on trees. |
| |
| ftree-reassoc |
| Common Report Var(flag_tree_reassoc) Init(1) Optimization |
| Enable reassociation on tree level. |
| |
| ftree-salias |
| Common Ignore |
| Does nothing. Preserved for backward compatibility. |
| |
| ftree-sink |
| Common Report Var(flag_tree_sink) Optimization |
| Enable SSA code sinking on trees. |
| |
| ftree-slsr |
| Common Report Var(flag_tree_slsr) Optimization |
| Perform straight-line strength reduction. |
| |
| ftree-sra |
| Common Report Var(flag_tree_sra) Optimization |
| Perform scalar replacement of aggregates. |
| |
| ftree-ter |
| Common Report Var(flag_tree_ter) Optimization |
| Replace temporary expressions in the SSA->normal pass. |
| |
| ftree-lrs |
| Common Report Var(flag_tree_live_range_split) Optimization |
| Perform live range splitting during the SSA->normal pass. |
| |
| ftree-vrp |
| Common Report Var(flag_tree_vrp) Init(0) Optimization |
| Perform Value Range Propagation on trees. |
| |
| fsplit-paths |
| Common Report Var(flag_split_paths) Init(0) Optimization |
| Split paths leading to loop backedges. |
| |
| funconstrained-commons |
| Common Var(flag_unconstrained_commons) Optimization |
| Assume common declarations may be overridden with ones with a larger |
| trailing array. |
| |
| funit-at-a-time |
| Common Report Var(flag_unit_at_a_time) Init(1) |
| Compile whole compilation unit at a time. |
| |
| funroll-loops |
| Common Report Var(flag_unroll_loops) Optimization |
| Perform loop unrolling when iteration count is known. |
| |
| funroll-all-loops |
| Common Report Var(flag_unroll_all_loops) Optimization |
| Perform loop unrolling for all loops. |
| |
| ; Nonzero means that loop optimizer may assume that the induction variables |
| ; that control loops do not overflow and that the loops with nontrivial |
| ; exit condition are not infinite |
| funsafe-loop-optimizations |
| Common Ignore |
| Does nothing. Preserved for backward compatibility. |
| |
| fassociative-math |
| Common Report Var(flag_associative_math) SetByCombined Optimization |
| Allow optimization for floating-point arithmetic which may change the |
| result of the operation due to rounding. |
| |
| freciprocal-math |
| Common Report Var(flag_reciprocal_math) SetByCombined Optimization |
| Same as -fassociative-math for expressions which include division. |
| |
| ; Nonzero means that unsafe floating-point math optimizations are allowed |
| ; for the sake of speed. IEEE compliance is not guaranteed, and operations |
| ; are allowed to assume that their arguments and results are "normal" |
| ; (e.g., nonnegative for SQRT). |
| funsafe-math-optimizations |
| Common Report Var(flag_unsafe_math_optimizations) Optimization SetByCombined |
| Allow math optimizations that may violate IEEE or ISO standards. |
| |
| funswitch-loops |
| Common Report Var(flag_unswitch_loops) Optimization |
| Perform loop unswitching. |
| |
| fsplit-loops |
| Common Report Var(flag_split_loops) Optimization |
| Perform loop splitting. |
| |
| funwind-tables |
| Common Report Var(flag_unwind_tables) Optimization |
| Just generate unwind tables for exception handling. |
| |
| fuse-ld=bfd |
| Common Driver Negative(fuse-ld=gold) |
| Use the bfd linker instead of the default linker. |
| |
| fuse-ld=gold |
| Common Driver Negative(fuse-ld=bfd) |
| Use the gold linker instead of the default linker. |
| |
| fuse-linker-plugin |
| Common Undocumented Var(flag_use_linker_plugin) |
| |
| ; Positive if we should track variables, negative if we should run |
| ; the var-tracking pass only to discard debug annotations, zero if |
| ; we're not to run it. When flag_var_tracking == 2 (AUTODETECT_VALUE) it |
| ; will be set according to optimize, debug_info_level and debug_hooks |
| ; in process_options (). |
| fvar-tracking |
| Common Report Var(flag_var_tracking) Init(2) PerFunction |
| Perform variable tracking. |
| |
| ; Positive if we should track variables at assignments, negative if |
| ; we should run the var-tracking pass only to discard debug |
| ; annotations. When flag_var_tracking_assignments == |
| ; AUTODETECT_VALUE it will be set according to flag_var_tracking. |
| fvar-tracking-assignments |
| Common Report Var(flag_var_tracking_assignments) Init(2) PerFunction |
| Perform variable tracking by annotating assignments. |
| |
| ; Nonzero if we should toggle flag_var_tracking_assignments after |
| ; processing options and computing its default. */ |
| fvar-tracking-assignments-toggle |
| Common Report Var(flag_var_tracking_assignments_toggle) PerFunction |
| Toggle -fvar-tracking-assignments. |
| |
| ; Positive if we should track uninitialized variables, negative if |
| ; we should run the var-tracking pass only to discard debug |
| ; annotations. When flag_var_tracking_uninit == AUTODETECT_VALUE it |
| ; will be set according to flag_var_tracking. |
| fvar-tracking-uninit |
| Common Report Var(flag_var_tracking_uninit) PerFunction |
| Perform variable tracking and also tag variables that are uninitialized. |
| |
| ; Alias to enable both -ftree-loop-vectorize and -ftree-slp-vectorize. |
| ftree-vectorize |
| Common Report Optimization |
| Enable vectorization on trees. |
| |
| ftree-vectorizer-verbose= |
| Common Joined RejectNegative Ignore |
| Does nothing. Preserved for backward compatibility. |
| |
| ftree-loop-vectorize |
| Common Report Var(flag_tree_loop_vectorize) Optimization EnabledBy(ftree-vectorize) |
| Enable loop vectorization on trees. |
| |
| ftree-slp-vectorize |
| Common Report Var(flag_tree_slp_vectorize) Optimization EnabledBy(ftree-vectorize) |
| Enable basic block vectorization (SLP) on trees. |
| |
| fvect-cost-model= |
| Common Joined RejectNegative Enum(vect_cost_model) Var(flag_vect_cost_model) Init(VECT_COST_MODEL_DEFAULT) Optimization |
| Specifies the cost model for vectorization. |
| -fvect-cost-model=[unlimited|dynamic|cheap] Specifies the cost model for vectorization. |
| |
| fsimd-cost-model= |
| Common Joined RejectNegative Enum(vect_cost_model) Var(flag_simd_cost_model) Init(VECT_COST_MODEL_UNLIMITED) Optimization |
| -fsimd-cost-model=[unlimited|dynamic|cheap] Specifies the vectorization cost model for code marked with a simd directive. |
| |
| Enum |
| Name(vect_cost_model) Type(enum vect_cost_model) UnknownError(unknown vectorizer cost model %qs) |
| |
| EnumValue |
| Enum(vect_cost_model) String(unlimited) Value(VECT_COST_MODEL_UNLIMITED) |
| |
| EnumValue |
| Enum(vect_cost_model) String(dynamic) Value(VECT_COST_MODEL_DYNAMIC) |
| |
| EnumValue |
| Enum(vect_cost_model) String(cheap) Value(VECT_COST_MODEL_CHEAP) |
| |
| fvect-cost-model |
| Common Alias(fvect-cost-model=,dynamic,unlimited) |
| Enables the dynamic vectorizer cost model. Preserved for backward compatibility. |
| |
| ftree-vect-loop-version |
| Common Ignore |
| Does nothing. Preserved for backward compatibility. |
| |
| ftree-scev-cprop |
| Common Report Var(flag_tree_scev_cprop) Init(1) Optimization |
| Enable copy propagation of scalar-evolution information. |
| |
| ; -fverbose-asm causes extra commentary information to be produced in |
| ; the generated assembly code (to make it more readable). This option |
| ; is generally only of use to those who actually need to read the |
| ; generated assembly code (perhaps while debugging the compiler itself). |
| ; -fno-verbose-asm, the default, causes the extra information |
| ; to not be added and is useful when comparing two assembler files. |
| fverbose-asm |
| Common Report Var(flag_verbose_asm) |
| Add extra commentary to assembler output. |
| |
| fvisibility= |
| Common Joined RejectNegative Enum(symbol_visibility) Var(default_visibility) Init(VISIBILITY_DEFAULT) |
| -fvisibility=[default|internal|hidden|protected] Set the default symbol visibility. |
| |
| Enum |
| Name(symbol_visibility) Type(enum symbol_visibility) UnknownError(unrecognized visibility value %qs) |
| |
| EnumValue |
| Enum(symbol_visibility) String(default) Value(VISIBILITY_DEFAULT) |
| |
| EnumValue |
| Enum(symbol_visibility) String(internal) Value(VISIBILITY_INTERNAL) |
| |
| EnumValue |
| Enum(symbol_visibility) String(hidden) Value(VISIBILITY_HIDDEN) |
| |
| EnumValue |
| Enum(symbol_visibility) String(protected) Value(VISIBILITY_PROTECTED) |
| |
| fvtable-verify= |
| Common Joined RejectNegative Enum(vtv_priority) Var(flag_vtable_verify) Init(VTV_NO_PRIORITY) |
| Validate vtable pointers before using them. |
| |
| Enum |
| Name(vtv_priority) Type(enum vtv_priority) UnknownError(unknown vtable verify initialization priority %qs) |
| |
| EnumValue |
| Enum(vtv_priority) String(none) Value(VTV_NO_PRIORITY) |
| |
| EnumValue |
| Enum(vtv_priority) String(std) Value(VTV_STANDARD_PRIORITY) |
| |
| EnumValue |
| Enum(vtv_priority) String(preinit) Value(VTV_PREINIT_PRIORITY) |
| |
| fvtv-counts |
| Common Var(flag_vtv_counts) |
| Output vtable verification counters. |
| |
| fvtv-debug |
| Common Var(flag_vtv_debug) |
| Output vtable verification pointer sets information. |
| |
| fvpt |
| Common Report Var(flag_value_profile_transformations) Optimization |
| Use expression value profiles in optimizations. |
| |
| fweb |
| Common Report Var(flag_web) Init(2) Optimization |
| Construct webs and split unrelated uses of single variable. |
| |
| ftree-builtin-call-dce |
| Common Report Var(flag_tree_builtin_call_dce) Init(0) Optimization |
| Enable conditional dead code elimination for builtin calls. |
| |
| fwhole-program |
| Common Report Var(flag_whole_program) Init(0) |
| Perform whole program optimizations. |
| |
| fwrapv-pointer |
| Common Report Var(flag_wrapv_pointer) Optimization |
| Assume pointer overflow wraps around. |
| |
| fwrapv |
| Common Report Var(flag_wrapv) Optimization |
| Assume signed arithmetic overflow wraps around. |
| |
| fzero-initialized-in-bss |
| Common Report Var(flag_zero_initialized_in_bss) Init(1) |
| Put zero initialized data in the bss section. |
| |
| g |
| Common Driver RejectNegative JoinedOrMissing |
| Generate debug information in default format. |
| |
| gas-loc-support |
| Common Driver Var(dwarf2out_as_loc_support) Init(2) |
| Assume assembler support for (DWARF2+) .loc directives |
| |
| gas-locview-support |
| Common Driver Var(dwarf2out_as_locview_support) Init(2) |
| Assume assembler support for view in (DWARF2+) .loc directives |
| |
| gcoff |
| Common Driver Ignore Warn(switch %qs no longer supported) |
| Does nothing. Preserved for backward compatibility. |
| |
| gcoff1 |
| Common Driver Ignore Warn(switch %qs no longer supported) |
| Does nothing. Preserved for backward compatibility. |
| |
| gcoff2 |
| Common Driver Ignore Warn(switch %qs no longer supported) |
| Does nothing. Preserved for backward compatibility. |
| |
| gcoff3 |
| Common Driver Ignore Warn(switch %qs no longer supported) |
| Does nothing. Preserved for backward compatibility. |
| |
| gcolumn-info |
| Common Driver Var(debug_column_info,1) Init(1) |
| Record DW_AT_decl_column and DW_AT_call_column in DWARF. |
| |
| gdwarf |
| Common Driver JoinedOrMissing Negative(gdwarf-) |
| Generate debug information in default version of DWARF format. |
| |
| gdwarf- |
| Common Driver Joined UInteger Var(dwarf_version) Init(4) Negative(gstabs) |
| Generate debug information in DWARF v2 (or later) format. |
| |
| ggdb |
| Common Driver JoinedOrMissing |
| Generate debug information in default extended format. |
| |
| ginline-points |
| Common Driver Var(debug_inline_points) Init(2) |
| Generate extended entry point information for inlined functions |
| |
| ginternal-reset-location-views |
| Common Driver Var(debug_internal_reset_location_views) Init(2) |
| Compute locview reset points based on insn length estimates |
| |
| gno- |
| RejectNegative Joined Undocumented |
| ; Catch the gno- prefix, so it doesn't backtrack to g<level>. |
| |
| gno-pubnames |
| Common Driver Negative(gpubnames) Var(debug_generate_pub_sections, 0) Init(-1) |
| Don't generate DWARF pubnames and pubtypes sections. |
| |
| gpubnames |
| Common Driver Negative(ggnu-pubnames) Var(debug_generate_pub_sections, 1) |
| Generate DWARF pubnames and pubtypes sections. |
| |
| ggnu-pubnames |
| Common Driver Negative(gno-pubnames) Var(debug_generate_pub_sections, 2) |
| Generate DWARF pubnames and pubtypes sections with GNU extensions. |
| |
| grecord-gcc-switches |
| Common Driver Var(dwarf_record_gcc_switches) Init(1) |
| Record gcc command line switches in DWARF DW_AT_producer. |
| |
| gsplit-dwarf |
| Common Driver Var(dwarf_split_debug_info) Init(0) |
| Generate debug information in separate .dwo files. |
| |
| gstabs |
| Common Driver JoinedOrMissing Negative(gstabs+) |
| Generate debug information in STABS format. |
| |
| gstabs+ |
| Common Driver JoinedOrMissing Negative(gvms) |
| Generate debug information in extended STABS format. |
| |
| gstatement-frontiers |
| Common Driver Var(debug_nonbind_markers_p) Init(2) |
| Emit progressive recommended breakpoint locations. |
| |
| gstrict-dwarf |
| Common Driver Report Var(dwarf_strict) Init(0) |
| Don't emit DWARF additions beyond selected version. |
| |
| gtoggle |
| Common Driver Report Var(flag_gtoggle) |
| Toggle debug information generation. |
| |
| gvariable-location-views |
| Common Driver Var(debug_variable_location_views, 1) Init(2) |
| Augment variable location lists with progressive views. |
| |
| gvariable-location-views=incompat5 |
| Common Driver RejectNegative Var(debug_variable_location_views, -1) Init(2) |
| |
| gvms |
| Common Driver JoinedOrMissing Negative(gxcoff) |
| Generate debug information in VMS format. |
| |
| gxcoff |
| Common Driver JoinedOrMissing Negative(gxcoff+) |
| Generate debug information in XCOFF format. |
| |
| gxcoff+ |
| Common Driver JoinedOrMissing Negative(gdwarf) |
| Generate debug information in extended XCOFF format. |
| |
| Enum |
| Name(compressed_debug_sections) Type(int) |
| |
| ; Since -gz= is completely handled in specs, the values aren't used and we |
| ; assign arbitrary constants. |
| EnumValue |
| Enum(compressed_debug_sections) String(none) Value(0) |
| |
| EnumValue |
| Enum(compressed_debug_sections) String(zlib) Value(1) |
| |
| EnumValue |
| Enum(compressed_debug_sections) String(zlib-gnu) Value(2) |
| |
| gz |
| Common Driver |
| Generate compressed debug sections. |
| |
| gz= |
| Common Driver RejectNegative Joined Enum(compressed_debug_sections) |
| -gz=<format> Generate compressed debug sections in format <format>. |
| |
| h |
| Driver Joined Separate |
| |
| iplugindir= |
| Common Joined Var(plugindir_string) Init(0) |
| -iplugindir=<dir> Set <dir> to be the default plugin directory. |
| |
| imultiarch |
| Common Joined Separate RejectDriver Var(imultiarch) Init(0) |
| -imultiarch <dir> Set <dir> to be the multiarch include subdirectory. |
| |
| l |
| Driver Joined Separate |
| |
| n |
| Driver |
| |
| no-canonical-prefixes |
| Driver |
| |
| nodefaultlibs |
| Driver |
| |
| nostartfiles |
| Driver |
| |
| nostdlib |
| Driver |
| |
| o |
| Common Driver Joined Separate Var(asm_file_name) MissingArgError(missing filename after %qs) |
| -o <file> Place output into <file>. |
| |
| p |
| Common Var(profile_flag) |
| Enable function profiling. |
| |
| pass-exit-codes |
| Driver Var(pass_exit_codes) |
| |
| pedantic |
| Common Alias(Wpedantic) |
| |
| pedantic-errors |
| Common Var(flag_pedantic_errors) |
| Like -pedantic but issue them as errors. |
| |
| pg |
| Driver |
| |
| pipe |
| Driver Var(use_pipes) |
| |
| print-file-name= |
| Driver JoinedOrMissing Var(print_file_name) |
| |
| print-libgcc-file-name |
| Driver |
| |
| print-multi-directory |
| Driver Var(print_multi_directory) |
| |
| print-multi-lib |
| Driver Var(print_multi_lib) |
| |
| print-multi-os-directory |
| Driver Var(print_multi_os_directory) |
| |
| print-multiarch |
| Driver Var(print_multiarch) |
| |
| print-prog-name= |
| Driver JoinedOrMissing Var(print_prog_name) |
| |
| print-search-dirs |
| Driver Var(print_search_dirs) |
| |
| print-sysroot |
| Driver Var(print_sysroot) |
| |
| print-sysroot-headers-suffix |
| Driver Var(print_sysroot_headers_suffix) |
| |
| quiet |
| Common Var(quiet_flag) RejectDriver |
| Do not display functions compiled or elapsed time. |
| |
| r |
| Driver |
| |
| s |
| Driver |
| |
| save-temps |
| Driver |
| |
| save-temps= |
| Driver Joined |
| |
| t |
| Driver |
| |
| time |
| Driver Var(report_times) |
| |
| time= |
| Driver JoinedOrMissing |
| |
| u |
| Driver Joined Separate |
| |
| undef |
| Driver |
| ; C option, but driver must not handle as "-u ndef". |
| |
| v |
| Common Driver Var(verbose_flag) |
| Enable verbose output. |
| |
| version |
| Common Var(version_flag) RejectDriver |
| Display the compiler's version. |
| |
| w |
| Common Var(inhibit_warnings) |
| Suppress warnings. |
| |
| wrapper |
| Driver Separate Var(wrapper_string) |
| |
| x |
| Driver Joined Separate |
| |
| shared |
| Driver RejectNegative Negative(static-pie) |
| Create a shared library. |
| |
| shared-libgcc |
| Driver |
| |
| specs |
| Driver Separate Alias(specs=) |
| |
| specs= |
| Driver Joined |
| |
| static |
| Driver |
| |
| static-libgcc |
| Driver |
| |
| static-libgfortran |
| Driver |
| ; Documented for Fortran, but always accepted by driver. |
| |
| static-libstdc++ |
| Driver |
| |
| static-libgo |
| Driver |
| ; Documented for Go, but always accepted by driver. |
| |
| static-libasan |
| Driver |
| |
| static-libtsan |
| Driver |
| |
| static-liblsan |
| Driver |
| |
| static-libubsan |
| Driver |
| |
| symbolic |
| Driver |
| |
| no-pie |
| Driver RejectNegative Negative(shared) |
| Don't create a dynamically linked position independent executable. |
| |
| pie |
| Driver RejectNegative Negative(no-pie) |
| Create a dynamically linked position independent executable. |
| |
| static-pie |
| Driver RejectNegative Negative(pie) |
| Create a static position independent executable. |
| |
| z |
| Driver Joined Separate |
| |
| fipa-ra |
| Common Report Var(flag_ipa_ra) Optimization |
| Use caller save register across calls if possible. |
| |
| ; This comment is to ensure we retain the blank line above. |
