| /* gospec.c -- Specific flags and argument handling of the gcc Go front end. |
| Copyright (C) 2009-2020 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/>. */ |
| |
| #include "config.h" |
| #include "system.h" |
| #include "coretypes.h" |
| #include "tm.h" |
| #include "opts.h" |
| |
| /* This bit is set if we saw a `-xfoo' language specification. */ |
| #define LANGSPEC (1<<1) |
| /* This bit is set if they did `-lm' or `-lmath'. */ |
| #define MATHLIB (1<<2) |
| /* This bit is set if they did `-lpthread'. */ |
| #define THREADLIB (1<<3) |
| /* This bit is set if they did `-lc'. */ |
| #define WITHLIBC (1<<4) |
| /* Skip this option. */ |
| #define SKIPOPT (1<<5) |
| |
| #ifndef MATH_LIBRARY |
| #define MATH_LIBRARY "m" |
| #endif |
| #ifndef MATH_LIBRARY_PROFILE |
| #define MATH_LIBRARY_PROFILE MATH_LIBRARY |
| #endif |
| |
| #define THREAD_LIBRARY "pthread" |
| #define THREAD_LIBRARY_PROFILE THREAD_LIBRARY |
| |
| #define LIBGO "go" |
| #define LIBGO_PROFILE LIBGO |
| #define LIBGOBEGIN "gobegin" |
| |
| void |
| lang_specific_driver (struct cl_decoded_option **in_decoded_options, |
| unsigned int *in_decoded_options_count, |
| int *in_added_libraries) |
| { |
| unsigned int i, j; |
| |
| /* If true, the user gave us the `-p' or `-pg' flag. */ |
| bool saw_profile_flag = false; |
| |
| /* This is a tristate: |
| -1 means we should not link in libgo |
| 0 means we should link in libgo if it is needed |
| 1 means libgo is needed and should be linked in. |
| 2 means libgo is needed and should be linked statically. */ |
| int library = 0; |
| |
| /* The new argument list will be contained in this. */ |
| struct cl_decoded_option *new_decoded_options; |
| |
| /* "-lm" or "-lmath" if it appears on the command line. */ |
| const struct cl_decoded_option *saw_math = 0; |
| |
| /* "-lpthread" if it appears on the command line. */ |
| const struct cl_decoded_option *saw_thread = 0; |
| |
| /* "-lc" if it appears on the command line. */ |
| const struct cl_decoded_option *saw_libc = 0; |
| |
| /* An array used to flag each argument that needs a bit set for |
| LANGSPEC, MATHLIB, or WITHLIBC. */ |
| int *args; |
| |
| /* Whether we need the thread library. */ |
| int need_thread = 0; |
| |
| /* By default, we throw on the math library if we have one. */ |
| int need_math = (MATH_LIBRARY[0] != '\0'); |
| |
| /* True if we saw -static. */ |
| int static_link = 0; |
| |
| /* True if we should add -shared-libgcc to the command-line. */ |
| int shared_libgcc = 1; |
| |
| /* The total number of arguments with the new stuff. */ |
| unsigned int argc; |
| |
| /* The argument list. */ |
| struct cl_decoded_option *decoded_options; |
| |
| /* The number of libraries added in. */ |
| int added_libraries; |
| |
| /* The total number of arguments with the new stuff. */ |
| int num_args = 1; |
| |
| /* Supports split stack */ |
| int supports_split_stack = 0; |
| |
| /* Whether the -o option was used. */ |
| bool saw_opt_o = false; |
| |
| /* Whether the -c option was used. Also used for -E, -fsyntax-only, |
| in general anything which implies only compilation and not |
| linking. */ |
| bool saw_opt_c = false; |
| |
| /* Whether the -S option was used. */ |
| bool saw_opt_S = false; |
| |
| #ifdef TARGET_CAN_SPLIT_STACK_64BIT |
| /* Whether the -m64 option is in force. */ |
| bool is_m64 = TARGET_CAN_SPLIT_STACK_64BIT; |
| #endif |
| |
| /* The first input file with an extension of .go. */ |
| const char *first_go_file = NULL; |
| |
| argc = *in_decoded_options_count; |
| decoded_options = *in_decoded_options; |
| added_libraries = *in_added_libraries; |
| |
| args = XCNEWVEC (int, argc); |
| |
| for (i = 1; i < argc; i++) |
| { |
| const char *arg = decoded_options[i].arg; |
| |
| switch (decoded_options[i].opt_index) |
| { |
| case OPT_r: |
| case OPT_nostdlib: |
| case OPT_nodefaultlibs: |
| library = -1; |
| break; |
| |
| case OPT_l: |
| if (strcmp (arg, MATH_LIBRARY) == 0) |
| { |
| args[i] |= MATHLIB; |
| need_math = 0; |
| } |
| else if (strcmp (arg, THREAD_LIBRARY) == 0) |
| args[i] |= THREADLIB; |
| else if (strcmp (arg, "c") == 0) |
| args[i] |= WITHLIBC; |
| else |
| /* Unrecognized libraries (e.g. -lfoo) may require libgo. */ |
| library = (library == 0) ? 1 : library; |
| break; |
| |
| #ifdef TARGET_CAN_SPLIT_STACK_64BIT |
| case OPT_m32: |
| is_m64 = false; |
| break; |
| |
| case OPT_m64: |
| is_m64 = true; |
| break; |
| #endif |
| |
| case OPT_pg: |
| case OPT_p: |
| saw_profile_flag = true; |
| break; |
| |
| case OPT_x: |
| if (library == 0 && strcmp (arg, "go") == 0) |
| library = 1; |
| break; |
| |
| case OPT_Xlinker: |
| case OPT_Wl_: |
| /* Arguments that go directly to the linker might be .o files, |
| or something, and so might cause libgo to be needed. */ |
| if (library == 0) |
| library = 1; |
| break; |
| |
| case OPT_c: |
| case OPT_E: |
| case OPT_M: |
| case OPT_MM: |
| case OPT_fsyntax_only: |
| /* Don't specify libraries if we won't link, since that would |
| cause a warning. */ |
| saw_opt_c = true; |
| library = -1; |
| break; |
| |
| case OPT_S: |
| saw_opt_S = true; |
| library = -1; |
| break; |
| |
| case OPT_o: |
| saw_opt_o = true; |
| break; |
| |
| case OPT_static: |
| static_link = 1; |
| break; |
| |
| case OPT_static_libgcc: |
| shared_libgcc = 0; |
| break; |
| |
| case OPT_static_libgo: |
| library = library >= 0 ? 2 : library; |
| args[i] |= SKIPOPT; |
| break; |
| |
| case OPT_SPECIAL_input_file: |
| if (library == 0) |
| library = 1; |
| |
| if (first_go_file == NULL) |
| { |
| int len; |
| |
| len = strlen (arg); |
| if (len > 3 && strcmp (arg + len - 3, ".go") == 0) |
| first_go_file = arg; |
| } |
| |
| break; |
| } |
| } |
| |
| /* There's no point adding -shared-libgcc if we don't have a shared |
| libgcc. */ |
| #ifndef ENABLE_SHARED_LIBGCC |
| shared_libgcc = 0; |
| #endif |
| |
| /* Make sure to have room for the trailing NULL argument. */ |
| num_args = argc + need_math + shared_libgcc + (library > 0) * 5 + 10; |
| new_decoded_options = XNEWVEC (struct cl_decoded_option, num_args); |
| |
| i = 0; |
| j = 0; |
| |
| /* Copy the 0th argument, i.e., the name of the program itself. */ |
| new_decoded_options[j++] = decoded_options[i++]; |
| |
| #ifdef TARGET_CAN_SPLIT_STACK |
| supports_split_stack = 1; |
| #endif |
| |
| #ifdef TARGET_CAN_SPLIT_STACK_64BIT |
| if (is_m64) |
| supports_split_stack = 1; |
| #endif |
| |
| /* If we are linking, pass -fsplit-stack if it is supported. */ |
| if ((library >= 0) && supports_split_stack) |
| { |
| generate_option (OPT_fsplit_stack, NULL, 1, CL_DRIVER, |
| &new_decoded_options[j]); |
| j++; |
| } |
| |
| /* NOTE: We start at 1 now, not 0. */ |
| while (i < argc) |
| { |
| new_decoded_options[j] = decoded_options[i]; |
| |
| /* Make sure -lgo is before the math library, since libgo itself |
| uses those math routines. */ |
| if (!saw_math && (args[i] & MATHLIB) && library > 0) |
| { |
| --j; |
| saw_math = &decoded_options[i]; |
| } |
| |
| if (!saw_thread && (args[i] & THREADLIB) && library > 0) |
| { |
| --j; |
| saw_thread = &decoded_options[i]; |
| } |
| |
| if (!saw_libc && (args[i] & WITHLIBC) && library > 0) |
| { |
| --j; |
| saw_libc = &decoded_options[i]; |
| } |
| |
| if ((args[i] & SKIPOPT) != 0) |
| --j; |
| |
| i++; |
| j++; |
| } |
| |
| /* If we didn't see a -o option, add one. This is because we need |
| the driver to pass all .go files to go1. Without a -o option the |
| driver will invoke go1 separately for each input file. FIXME: |
| This should probably use some other interface to force the driver |
| to set combine_inputs. */ |
| if (first_go_file != NULL && !saw_opt_o) |
| { |
| if (saw_opt_c || saw_opt_S) |
| { |
| const char *base; |
| int baselen; |
| int alen; |
| char *out; |
| |
| base = lbasename (first_go_file); |
| baselen = strlen (base) - 3; |
| alen = baselen + 3; |
| out = XNEWVEC (char, alen); |
| memcpy (out, base, baselen); |
| /* The driver will convert .o to some other suffix (e.g., |
| .obj) if appropriate. */ |
| out[baselen] = '.'; |
| if (saw_opt_S) |
| out[baselen + 1] = 's'; |
| else |
| out[baselen + 1] = 'o'; |
| out[baselen + 2] = '\0'; |
| generate_option (OPT_o, out, 1, CL_DRIVER, |
| &new_decoded_options[j]); |
| } |
| else |
| generate_option (OPT_o, "a.out", 1, CL_DRIVER, |
| &new_decoded_options[j]); |
| j++; |
| } |
| |
| /* Add `-lgo' if we haven't already done so. */ |
| if (library > 0) |
| { |
| generate_option (OPT_l, LIBGOBEGIN, 1, CL_DRIVER, |
| &new_decoded_options[j]); |
| added_libraries++; |
| j++; |
| |
| #ifdef HAVE_LD_STATIC_DYNAMIC |
| if (library > 1 && !static_link) |
| { |
| generate_option (OPT_Wl_, LD_STATIC_OPTION, 1, CL_DRIVER, |
| &new_decoded_options[j]); |
| j++; |
| } |
| #endif |
| |
| generate_option (OPT_l, saw_profile_flag ? LIBGO_PROFILE : LIBGO, 1, |
| CL_DRIVER, &new_decoded_options[j]); |
| added_libraries++; |
| j++; |
| |
| #ifdef HAVE_LD_STATIC_DYNAMIC |
| if (library > 1 && !static_link) |
| { |
| generate_option (OPT_Wl_, LD_DYNAMIC_OPTION, 1, CL_DRIVER, |
| &new_decoded_options[j]); |
| j++; |
| } |
| #endif |
| |
| /* When linking libgo statically we also need to link with the |
| pthread library. */ |
| if (library > 1 || static_link) |
| need_thread = 1; |
| } |
| |
| if (saw_thread) |
| new_decoded_options[j++] = *saw_thread; |
| else if (library > 0 && need_thread) |
| { |
| generate_option (OPT_l, |
| (saw_profile_flag |
| ? THREAD_LIBRARY_PROFILE |
| : THREAD_LIBRARY), |
| 1, CL_DRIVER, &new_decoded_options[j]); |
| added_libraries++; |
| j++; |
| } |
| |
| if (saw_math) |
| new_decoded_options[j++] = *saw_math; |
| else if (library > 0 && need_math) |
| { |
| generate_option (OPT_l, |
| saw_profile_flag ? MATH_LIBRARY_PROFILE : MATH_LIBRARY, |
| 1, CL_DRIVER, &new_decoded_options[j]); |
| added_libraries++; |
| j++; |
| } |
| |
| if (saw_libc) |
| new_decoded_options[j++] = *saw_libc; |
| if (shared_libgcc && !static_link) |
| generate_option (OPT_shared_libgcc, NULL, 1, CL_DRIVER, |
| &new_decoded_options[j++]); |
| |
| /* libgcc wraps pthread_create to support split stack, however, due to |
| relative ordering of -lpthread and -lgcc, we can't just mark |
| __real_pthread_create in libgcc as non-weak. But we need to link in |
| pthread_create from pthread if we are statically linking, so we work- |
| around by passing -u pthread_create to the linker. */ |
| if (static_link && supports_split_stack) |
| { |
| generate_option (OPT_Wl_, "-u,pthread_create", 1, CL_DRIVER, |
| &new_decoded_options[j]); |
| j++; |
| } |
| |
| #if defined(TARGET_SOLARIS) && !defined(USE_GLD) |
| /* We use a common symbol for go$zerovalue. On Solaris, when not |
| using the GNU linker, the Solaris linker needs an option to not |
| warn about this. Everything works without this option, but you |
| get unsightly warnings at link time. */ |
| generate_option (OPT_Wl_, "-t", 1, CL_DRIVER, &new_decoded_options[j]); |
| j++; |
| #endif |
| |
| *in_decoded_options_count = j; |
| *in_decoded_options = new_decoded_options; |
| *in_added_libraries = added_libraries; |
| } |
| |
| /* Called before linking. Returns 0 on success and -1 on failure. */ |
| int lang_specific_pre_link (void) /* Not used for Go. */ |
| { |
| return 0; |
| } |
| |
| /* Number of extra output files that lang_specific_pre_link may generate. */ |
| int lang_specific_extra_outfiles = 0; /* Not used for Go. */ |