| /* Specific flags and argument handling of the C++ front end. |
| Copyright (C) 1996-2022 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 `-lc'. */ |
| #define WITHLIBC (1<<3) |
| /* Skip this option. */ |
| #define SKIPOPT (1<<4) |
| |
| #ifndef MATH_LIBRARY |
| #define MATH_LIBRARY "m" |
| #endif |
| #ifndef MATH_LIBRARY_PROFILE |
| #define MATH_LIBRARY_PROFILE MATH_LIBRARY |
| #endif |
| |
| #ifndef LIBSTDCXX |
| #define LIBSTDCXX "stdc++" |
| #endif |
| #ifndef LIBSTDCXX_PROFILE |
| #define LIBSTDCXX_PROFILE LIBSTDCXX |
| #endif |
| #ifndef LIBSTDCXX_STATIC |
| #define LIBSTDCXX_STATIC NULL |
| #endif |
| |
| #ifndef LIBCXX |
| #define LIBCXX "c++" |
| #endif |
| #ifndef LIBCXX_PROFILE |
| #define LIBCXX_PROFILE LIBCXX |
| #endif |
| #ifndef LIBCXX_STATIC |
| #define LIBCXX_STATIC NULL |
| #endif |
| |
| #ifndef LIBCXXABI |
| #define LIBCXXABI "c++abi" |
| #endif |
| #ifndef LIBCXXABI_PROFILE |
| #define LIBCXXABI_PROFILE LIBCXXABI |
| #endif |
| #ifndef LIBCXXABI_STATIC |
| #define LIBCXXABI_STATIC NULL |
| #endif |
| |
| /* The values used here must match those of the stdlib_kind enumeration |
| in c.opt. */ |
| enum stdcxxlib_kind |
| { |
| USE_LIBSTDCXX = 1, |
| USE_LIBCXX = 2 |
| }; |
| |
| 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 nonzero, the user gave us the `-p' or `-pg' flag. */ |
| int saw_profile_flag = 0; |
| |
| /* What action to take for the c++ runtime library: |
| -1 means we should not link it in. |
| 0 means we should link it if it is needed. |
| 1 means it is needed and should be linked in. |
| 2 means it is needed but should be linked statically. */ |
| int library = 0; |
| |
| /* Which c++ runtime library to link. */ |
| stdcxxlib_kind which_library = USE_LIBSTDCXX; |
| |
| /* The number of arguments being added to what's in argv, other than |
| libraries. We use this to track the number of times we've inserted |
| -xc++/-xnone. */ |
| int added = 0; |
| |
| /* The new argument list will be contained in this. */ |
| struct cl_decoded_option *new_decoded_options; |
| |
| /* Nonzero if we saw a `-xfoo' language specification on the |
| command line. Used to avoid adding our own -xc++ if the user |
| already gave a language for the file. */ |
| int saw_speclang = 0; |
| |
| /* "-lm" or "-lmath" if it appears on the command line. */ |
| const struct cl_decoded_option *saw_math = NULL; |
| |
| /* "-lrt" or eqivalent if it appears on the command line. */ |
| const struct cl_decoded_option *saw_time = NULL; |
| |
| /* "-lc" if it appears on the command line. */ |
| const struct cl_decoded_option *saw_libc = NULL; |
| |
| /* An array used to flag each argument that needs a bit set for |
| LANGSPEC, MATHLIB, or WITHLIBC. */ |
| int *args; |
| |
| /* 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. */ |
| unsigned int num_args = 1; |
| |
| 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; |
| if (decoded_options[i].errors & CL_ERR_MISSING_ARG) |
| continue; /* Avoid examining arguments of options missing them. */ |
| |
| switch (decoded_options[i].opt_index) |
| { |
| 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, "c") == 0) |
| args[i] |= WITHLIBC; |
| else |
| /* Unrecognized libraries (e.g. -lfoo) may require libstdc++. */ |
| library = (library == 0) ? 1 : library; |
| break; |
| |
| case OPT_pg: |
| case OPT_p: |
| saw_profile_flag++; |
| break; |
| |
| case OPT_x: |
| if (library == 0 |
| && (strcmp (arg, "c++") == 0 |
| || strcmp (arg, "c++-cpp-output") == 0 |
| || strcmp (arg, "objective-c++") == 0 |
| || strcmp (arg, "objective-c++-cpp-output") == 0)) |
| library = 1; |
| |
| saw_speclang = 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 libstdc++ to be needed. */ |
| if (library == 0) |
| library = 1; |
| break; |
| |
| case OPT_c: |
| case OPT_r: |
| case OPT_S: |
| 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. */ |
| library = -1; |
| break; |
| |
| case OPT_static: |
| static_link = 1; |
| break; |
| |
| case OPT_static_libgcc: |
| shared_libgcc = 0; |
| break; |
| |
| case OPT_static_libstdc__: |
| library = library >= 0 ? 2 : library; |
| args[i] |= SKIPOPT; |
| break; |
| |
| case OPT_stdlib_: |
| which_library = (stdcxxlib_kind) decoded_options[i].value; |
| break; |
| |
| case OPT_SPECIAL_input_file: |
| { |
| int len; |
| |
| /* We don't do this anymore, since we don't get them with minus |
| signs on them. */ |
| if (arg[0] == '\0' || arg[1] == '\0') |
| continue; |
| |
| if (saw_speclang) |
| { |
| saw_speclang = 0; |
| continue; |
| } |
| |
| /* If the filename ends in .[chi], put options around it. |
| But not if a specified -x option is currently active. */ |
| len = strlen (arg); |
| if (len > 2 |
| && (arg[len - 1] == 'c' |
| || arg[len - 1] == 'i' |
| || arg[len - 1] == 'h') |
| && arg[len - 2] == '.') |
| { |
| args[i] |= LANGSPEC; |
| added += 2; |
| } |
| |
| /* If we don't know that this is a header file, we might |
| need to be linking in the libraries. */ |
| if (library == 0) |
| { |
| if ((len <= 2 || strcmp (arg + (len - 2), ".H") != 0) |
| && (len <= 2 || strcmp (arg + (len - 2), ".h") != 0) |
| && (len <= 4 || strcmp (arg + (len - 4), ".hpp") != 0) |
| && (len <= 3 || strcmp (arg + (len - 3), ".hp") != 0) |
| && (len <= 4 || strcmp (arg + (len - 4), ".hxx") != 0) |
| && (len <= 4 || strcmp (arg + (len - 4), ".h++") != 0) |
| && (len <= 4 || strcmp (arg + (len - 4), ".HPP") != 0) |
| && (len <= 4 || strcmp (arg + (len - 4), ".tcc") != 0) |
| && (len <= 3 || strcmp (arg + (len - 3), ".hh") != 0)) |
| library = 1; |
| } |
| } |
| break; |
| } |
| } |
| |
| /* There's no point adding -shared-libgcc if we don't have a shared |
| libgcc. */ |
| #ifndef ENABLE_SHARED_LIBGCC |
| shared_libgcc = 0; |
| #endif |
| |
| /* Add one for shared_libgcc or extra static library. */ |
| num_args = argc + added + need_math + (library > 0) * 4 + 1; |
| /* For libc++, on most platforms, the ABI library (usually called libc++abi) |
| is provided as a separate DSO, which we must also append. |
| However, a platform might have the ability to forward the ABI library |
| from libc++, or combine it in some other way; in that case, LIBCXXABI |
| should be set to NULL to signal that it need not be appended. */ |
| if (which_library == USE_LIBCXX && LIBCXXABI != NULL) |
| num_args += 4; |
| 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++]; |
| |
| /* NOTE: We start at 1 now, not 0. */ |
| while (i < argc) |
| { |
| new_decoded_options[j] = decoded_options[i]; |
| |
| /* Make sure -lstdc++ is before the math library, since libstdc++ |
| itself uses those math routines. */ |
| if (!saw_math && (args[i] & MATHLIB) && library > 0) |
| { |
| --j; |
| saw_math = &decoded_options[i]; |
| } |
| |
| if (!saw_libc && (args[i] & WITHLIBC) && library > 0) |
| { |
| --j; |
| saw_libc = &decoded_options[i]; |
| } |
| |
| /* Wrap foo.[chi] files in a language specification to |
| force the gcc compiler driver to run cc1plus on them. */ |
| if (args[i] & LANGSPEC) |
| { |
| const char *arg = decoded_options[i].arg; |
| int len = strlen (arg); |
| switch (arg[len - 1]) |
| { |
| case 'c': |
| generate_option (OPT_x, "c++", 1, CL_DRIVER, |
| &new_decoded_options[j++]); |
| break; |
| case 'i': |
| generate_option (OPT_x, "c++-cpp-output", 1, CL_DRIVER, |
| &new_decoded_options[j++]); |
| break; |
| case 'h': |
| generate_option (OPT_x, "c++-header", 1, CL_DRIVER, |
| &new_decoded_options[j++]); |
| break; |
| default: |
| gcc_unreachable (); |
| } |
| new_decoded_options[j++] = decoded_options[i]; |
| generate_option (OPT_x, "none", 1, CL_DRIVER, |
| &new_decoded_options[j]); |
| } |
| |
| if ((args[i] & SKIPOPT) != 0) |
| --j; |
| |
| i++; |
| j++; |
| } |
| |
| /* Add `-lstdc++' if we haven't already done so. */ |
| if (library > 0) |
| { |
| #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 |
| if (which_library == USE_LIBCXX) |
| { |
| generate_option (OPT_l, |
| saw_profile_flag ? LIBCXX_PROFILE : LIBCXX, 1, |
| CL_DRIVER, &new_decoded_options[j]); |
| if (LIBCXXABI != NULL) |
| { |
| j++; |
| added_libraries++; |
| generate_option (OPT_l, |
| saw_profile_flag ? LIBCXXABI_PROFILE |
| : LIBCXXABI, 1, |
| CL_DRIVER, &new_decoded_options[j]); |
| } |
| } |
| else |
| generate_option (OPT_l, |
| saw_profile_flag ? LIBSTDCXX_PROFILE : LIBSTDCXX, 1, |
| CL_DRIVER, &new_decoded_options[j]); |
| added_libraries++; |
| j++; |
| /* Add target-dependent static library, if necessary. */ |
| if ((static_link || library > 1) && LIBSTDCXX_STATIC != NULL) |
| { |
| generate_option (OPT_l, LIBSTDCXX_STATIC, 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 |
| } |
| 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_time) |
| new_decoded_options[j++] = *saw_time; |
| 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++]); |
| |
| *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 C++. */ |
| { |
| return 0; |
| } |
| |
| /* Number of extra output files that lang_specific_pre_link may generate. */ |
| int lang_specific_extra_outfiles = 0; /* Not used for C++. */ |