/* gospec.c -- Specific flags and argument handling of the gcc Go front end. Copyright (C) 2009-2014 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 . */ #include "config.h" #include "system.h" #include "coretypes.h" #include "tm.h" #include "gcc.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; /* 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; /* 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_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; 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++]; /* If we are linking, pass -fsplit-stack if it is supported. */ #ifdef TARGET_CAN_SPLIT_STACK if (library >= 0) { generate_option (OPT_fsplit_stack, NULL, 1, CL_DRIVER, &new_decoded_options[j]); j++; } #endif /* 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++]); #ifdef TARGET_CAN_SPLIT_STACK /* 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 to the linker. */ if (static_link) { generate_option (OPT_Wl_, "-u,pthread_create", 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. */