467 lines
12 KiB
C
467 lines
12 KiB
C
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/* gospec.c -- Specific flags and argument handling of the gcc Go front end.
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Copyright (C) 2009-2021 Free Software Foundation, Inc.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 3, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING3. If not see
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<http://www.gnu.org/licenses/>. */
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#include "config.h"
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#include "system.h"
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#include "coretypes.h"
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#include "tm.h"
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#include "opts.h"
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/* This bit is set if we saw a `-xfoo' language specification. */
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#define LANGSPEC (1<<1)
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/* This bit is set if they did `-lm' or `-lmath'. */
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#define MATHLIB (1<<2)
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/* This bit is set if they did `-lpthread'. */
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#define THREADLIB (1<<3)
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/* This bit is set if they did `-lc'. */
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#define WITHLIBC (1<<4)
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/* Skip this option. */
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#define SKIPOPT (1<<5)
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#ifndef MATH_LIBRARY
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#define MATH_LIBRARY "m"
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#endif
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#ifndef MATH_LIBRARY_PROFILE
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#define MATH_LIBRARY_PROFILE MATH_LIBRARY
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#endif
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#define THREAD_LIBRARY "pthread"
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#define THREAD_LIBRARY_PROFILE THREAD_LIBRARY
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#define LIBGO "go"
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#define LIBGO_PROFILE LIBGO
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#define LIBGOBEGIN "gobegin"
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void
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lang_specific_driver (struct cl_decoded_option **in_decoded_options,
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unsigned int *in_decoded_options_count,
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int *in_added_libraries)
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{
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unsigned int i, j;
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/* If true, the user gave us the `-p' or `-pg' flag. */
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bool saw_profile_flag = false;
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/* This is a tristate:
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-1 means we should not link in libgo
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0 means we should link in libgo if it is needed
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1 means libgo is needed and should be linked in.
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2 means libgo is needed and should be linked statically. */
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int library = 0;
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/* The new argument list will be contained in this. */
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struct cl_decoded_option *new_decoded_options;
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/* "-lm" or "-lmath" if it appears on the command line. */
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const struct cl_decoded_option *saw_math = 0;
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/* "-lpthread" if it appears on the command line. */
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const struct cl_decoded_option *saw_thread = 0;
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/* "-lc" if it appears on the command line. */
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const struct cl_decoded_option *saw_libc = 0;
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/* An array used to flag each argument that needs a bit set for
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LANGSPEC, MATHLIB, or WITHLIBC. */
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int *args;
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/* Whether we need the thread library. */
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int need_thread = 0;
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/* By default, we throw on the math library if we have one. */
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int need_math = (MATH_LIBRARY[0] != '\0');
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/* True if we saw -static. */
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int static_link = 0;
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/* True if we should add -shared-libgcc to the command-line. */
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int shared_libgcc = 1;
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/* The total number of arguments with the new stuff. */
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unsigned int argc;
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/* The argument list. */
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struct cl_decoded_option *decoded_options;
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/* The number of libraries added in. */
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int added_libraries;
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/* The total number of arguments with the new stuff. */
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int num_args = 1;
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/* Supports split stack */
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int supports_split_stack = 0;
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/* Whether the -o option was used. */
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bool saw_opt_o = false;
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/* Whether the -c option was used. Also used for -E, -fsyntax-only,
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in general anything which implies only compilation and not
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linking. */
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bool saw_opt_c = false;
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/* Whether the -S option was used. */
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bool saw_opt_S = false;
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#ifdef TARGET_CAN_SPLIT_STACK_64BIT
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/* Whether the -m64 option is in force. */
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bool is_m64 = TARGET_CAN_SPLIT_STACK_64BIT;
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#endif
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/* The first input file with an extension of .go. */
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const char *first_go_file = NULL;
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/* Whether we saw any -g option. */
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bool saw_opt_g = false;
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argc = *in_decoded_options_count;
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decoded_options = *in_decoded_options;
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added_libraries = *in_added_libraries;
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args = XCNEWVEC (int, argc);
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for (i = 1; i < argc; i++)
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{
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const char *arg = decoded_options[i].arg;
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switch (decoded_options[i].opt_index)
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{
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case OPT_r:
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case OPT_nostdlib:
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case OPT_nodefaultlibs:
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library = -1;
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break;
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case OPT_l:
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if (strcmp (arg, MATH_LIBRARY) == 0)
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{
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args[i] |= MATHLIB;
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need_math = 0;
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}
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else if (strcmp (arg, THREAD_LIBRARY) == 0)
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args[i] |= THREADLIB;
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else if (strcmp (arg, "c") == 0)
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args[i] |= WITHLIBC;
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else
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/* Unrecognized libraries (e.g. -lfoo) may require libgo. */
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library = (library == 0) ? 1 : library;
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break;
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#ifdef TARGET_CAN_SPLIT_STACK_64BIT
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case OPT_m32:
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is_m64 = false;
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break;
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case OPT_m64:
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is_m64 = true;
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break;
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#endif
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case OPT_pg:
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case OPT_p:
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saw_profile_flag = true;
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break;
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case OPT_x:
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if (library == 0 && strcmp (arg, "go") == 0)
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library = 1;
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break;
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case OPT_Xlinker:
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case OPT_Wl_:
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/* Arguments that go directly to the linker might be .o files,
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or something, and so might cause libgo to be needed. */
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if (library == 0)
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library = 1;
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break;
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case OPT_c:
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case OPT_E:
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case OPT_M:
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case OPT_MM:
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case OPT_fsyntax_only:
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/* Don't specify libraries if we won't link, since that would
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cause a warning. */
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saw_opt_c = true;
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library = -1;
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break;
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case OPT_S:
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saw_opt_S = true;
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library = -1;
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break;
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case OPT_o:
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saw_opt_o = true;
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break;
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case OPT_g:
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case OPT_gdwarf:
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case OPT_gdwarf_:
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case OPT_ggdb:
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case OPT_gstabs:
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case OPT_gstabs_:
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case OPT_gvms:
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case OPT_gxcoff:
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case OPT_gxcoff_:
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saw_opt_g = true;
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break;
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case OPT_static:
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static_link = 1;
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break;
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case OPT_static_libgcc:
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shared_libgcc = 0;
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break;
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case OPT_static_libgo:
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library = library >= 0 ? 2 : library;
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args[i] |= SKIPOPT;
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break;
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case OPT_SPECIAL_input_file:
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if (library == 0)
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library = 1;
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if (first_go_file == NULL)
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{
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int len;
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len = strlen (arg);
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if (len > 3 && strcmp (arg + len - 3, ".go") == 0)
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first_go_file = arg;
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}
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break;
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}
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}
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/* There's no point adding -shared-libgcc if we don't have a shared
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libgcc. */
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#ifndef ENABLE_SHARED_LIBGCC
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shared_libgcc = 0;
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#endif
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/* Make sure to have room for the trailing NULL argument. */
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num_args = argc + need_math + shared_libgcc + (library > 0) * 5 + 10;
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new_decoded_options = XNEWVEC (struct cl_decoded_option, num_args);
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i = 0;
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j = 0;
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/* Copy the 0th argument, i.e., the name of the program itself. */
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new_decoded_options[j++] = decoded_options[i++];
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#ifdef TARGET_CAN_SPLIT_STACK
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supports_split_stack = 1;
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#endif
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#ifdef TARGET_CAN_SPLIT_STACK_64BIT
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if (is_m64)
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supports_split_stack = 1;
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#endif
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/* If we are linking, pass -fsplit-stack if it is supported. */
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if ((library >= 0) && supports_split_stack)
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{
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generate_option (OPT_fsplit_stack, NULL, 1, CL_DRIVER,
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&new_decoded_options[j]);
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j++;
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}
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/* The go1 compiler is going to enable debug info by default. If we
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don't see any -g options, force -g, so that we invoke the
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assembler with the right debug option. */
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if (!saw_opt_g)
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{
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generate_option (OPT_g, "1", 0, CL_DRIVER, &new_decoded_options[j]);
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j++;
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}
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/* NOTE: We start at 1 now, not 0. */
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while (i < argc)
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{
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new_decoded_options[j] = decoded_options[i];
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/* Make sure -lgo is before the math library, since libgo itself
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uses those math routines. */
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if (!saw_math && (args[i] & MATHLIB) && library > 0)
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{
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--j;
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saw_math = &decoded_options[i];
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}
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if (!saw_thread && (args[i] & THREADLIB) && library > 0)
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{
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--j;
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saw_thread = &decoded_options[i];
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}
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if (!saw_libc && (args[i] & WITHLIBC) && library > 0)
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{
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--j;
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saw_libc = &decoded_options[i];
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}
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if ((args[i] & SKIPOPT) != 0)
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--j;
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i++;
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j++;
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}
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/* If we didn't see a -o option, add one. This is because we need
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the driver to pass all .go files to go1. Without a -o option the
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driver will invoke go1 separately for each input file. FIXME:
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This should probably use some other interface to force the driver
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to set combine_inputs. */
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if (first_go_file != NULL && !saw_opt_o)
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{
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if (saw_opt_c || saw_opt_S)
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{
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const char *base;
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int baselen;
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int alen;
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char *out;
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base = lbasename (first_go_file);
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baselen = strlen (base) - 3;
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alen = baselen + 3;
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out = XNEWVEC (char, alen);
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memcpy (out, base, baselen);
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/* The driver will convert .o to some other suffix (e.g.,
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.obj) if appropriate. */
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out[baselen] = '.';
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if (saw_opt_S)
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out[baselen + 1] = 's';
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else
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out[baselen + 1] = 'o';
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out[baselen + 2] = '\0';
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generate_option (OPT_o, out, 1, CL_DRIVER,
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&new_decoded_options[j]);
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}
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else
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generate_option (OPT_o, "a.out", 1, CL_DRIVER,
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&new_decoded_options[j]);
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j++;
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}
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/* Add `-lgo' if we haven't already done so. */
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if (library > 0)
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{
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generate_option (OPT_l, LIBGOBEGIN, 1, CL_DRIVER,
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&new_decoded_options[j]);
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added_libraries++;
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j++;
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#ifdef HAVE_LD_STATIC_DYNAMIC
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if (library > 1 && !static_link)
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{
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generate_option (OPT_Wl_, LD_STATIC_OPTION, 1, CL_DRIVER,
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&new_decoded_options[j]);
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j++;
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}
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#endif
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generate_option (OPT_l, saw_profile_flag ? LIBGO_PROFILE : LIBGO, 1,
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CL_DRIVER, &new_decoded_options[j]);
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added_libraries++;
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j++;
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#ifdef HAVE_LD_STATIC_DYNAMIC
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if (library > 1 && !static_link)
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{
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generate_option (OPT_Wl_, LD_DYNAMIC_OPTION, 1, CL_DRIVER,
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|
&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. */
|