1 /* gospec.c -- Specific flags and argument handling of the gcc Go front end.
2 Copyright (C) 2009, 2010, 2011, 2012 Free Software Foundation, Inc.
4 This file is part of GCC.
6 GCC is free software; you can redistribute it and/or modify it under
7 the terms of the GNU General Public License as published by the Free
8 Software Foundation; either version 3, or (at your option) any later
11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 You should have received a copy of the GNU General Public License
17 along with GCC; see the file COPYING3. If not see
18 <http://www.gnu.org/licenses/>. */
22 #include "coretypes.h"
27 /* This bit is set if we saw a `-xfoo' language specification. */
28 #define LANGSPEC (1<<1)
29 /* This bit is set if they did `-lm' or `-lmath'. */
30 #define MATHLIB (1<<2)
31 /* This bit is set if they did `-lpthread'. */
32 #define THREADLIB (1<<3)
33 /* This bit is set if they did `-lc'. */
34 #define WITHLIBC (1<<4)
35 /* Skip this option. */
36 #define SKIPOPT (1<<5)
39 #define MATH_LIBRARY "m"
41 #ifndef MATH_LIBRARY_PROFILE
42 #define MATH_LIBRARY_PROFILE MATH_LIBRARY
45 #define THREAD_LIBRARY "pthread"
46 #define THREAD_LIBRARY_PROFILE THREAD_LIBRARY
49 #define LIBGO_PROFILE LIBGO
50 #define LIBGOBEGIN "gobegin"
53 lang_specific_driver (struct cl_decoded_option **in_decoded_options,
54 unsigned int *in_decoded_options_count,
55 int *in_added_libraries)
59 /* If true, the user gave us the `-p' or `-pg' flag. */
60 bool saw_profile_flag = false;
62 /* This is a tristate:
63 -1 means we should not link in libgo
64 0 means we should link in libgo if it is needed
65 1 means libgo is needed and should be linked in.
66 2 means libgo is needed and should be linked statically. */
69 /* The new argument list will be contained in this. */
70 struct cl_decoded_option *new_decoded_options;
72 /* "-lm" or "-lmath" if it appears on the command line. */
73 const struct cl_decoded_option *saw_math = 0;
75 /* "-lpthread" if it appears on the command line. */
76 const struct cl_decoded_option *saw_thread = 0;
78 /* "-lc" if it appears on the command line. */
79 const struct cl_decoded_option *saw_libc = 0;
81 /* An array used to flag each argument that needs a bit set for
82 LANGSPEC, MATHLIB, or WITHLIBC. */
85 /* Whether we need the thread library. */
88 /* By default, we throw on the math library if we have one. */
89 int need_math = (MATH_LIBRARY[0] != '\0');
91 /* True if we saw -static. */
94 /* True if we should add -shared-libgcc to the command-line. */
95 int shared_libgcc = 1;
97 /* The total number of arguments with the new stuff. */
100 /* The argument list. */
101 struct cl_decoded_option *decoded_options;
103 /* The number of libraries added in. */
106 /* The total number of arguments with the new stuff. */
109 /* Whether the -o option was used. */
110 bool saw_opt_o = false;
112 /* Whether the -S option was used. */
113 bool saw_opt_S = false;
115 /* The first input file with an extension of .go. */
116 const char *first_go_file = NULL;
118 argc = *in_decoded_options_count;
119 decoded_options = *in_decoded_options;
120 added_libraries = *in_added_libraries;
122 args = XCNEWVEC (int, argc);
124 for (i = 1; i < argc; i++)
126 const char *arg = decoded_options[i].arg;
128 switch (decoded_options[i].opt_index)
131 case OPT_nodefaultlibs:
136 if (strcmp (arg, MATH_LIBRARY) == 0)
141 else if (strcmp (arg, THREAD_LIBRARY) == 0)
142 args[i] |= THREADLIB;
143 else if (strcmp (arg, "c") == 0)
146 /* Unrecognized libraries (e.g. -lfoo) may require libgo. */
147 library = (library == 0) ? 1 : library;
152 saw_profile_flag = true;
156 if (library == 0 && strcmp (arg, "go") == 0)
162 /* Arguments that go directly to the linker might be .o files,
163 or something, and so might cause libgo to be needed. */
172 case OPT_fsyntax_only:
173 /* Don't specify libraries if we won't link, since that would
191 case OPT_static_libgcc:
195 case OPT_static_libgo:
196 library = library >= 0 ? 2 : library;
200 case OPT_SPECIAL_input_file:
204 if (first_go_file == NULL)
209 if (len > 3 && strcmp (arg + len - 3, ".go") == 0)
217 /* There's no point adding -shared-libgcc if we don't have a shared
219 #ifndef ENABLE_SHARED_LIBGCC
223 /* Make sure to have room for the trailing NULL argument. */
224 num_args = argc + need_math + shared_libgcc + (library > 0) * 5 + 5;
225 new_decoded_options = XNEWVEC (struct cl_decoded_option, num_args);
230 /* Copy the 0th argument, i.e., the name of the program itself. */
231 new_decoded_options[j++] = decoded_options[i++];
233 /* If we are linking, pass -fsplit-stack if it is supported. */
234 #ifdef TARGET_CAN_SPLIT_STACK
237 generate_option (OPT_fsplit_stack, NULL, 1, CL_DRIVER,
238 &new_decoded_options[j]);
243 /* NOTE: We start at 1 now, not 0. */
246 new_decoded_options[j] = decoded_options[i];
248 /* Make sure -lgo is before the math library, since libgo itself
249 uses those math routines. */
250 if (!saw_math && (args[i] & MATHLIB) && library > 0)
253 saw_math = &decoded_options[i];
256 if (!saw_thread && (args[i] & THREADLIB) && library > 0)
259 saw_thread = &decoded_options[i];
262 if (!saw_libc && (args[i] & WITHLIBC) && library > 0)
265 saw_libc = &decoded_options[i];
268 if ((args[i] & SKIPOPT) != 0)
275 /* If we are not linking, add a -o option. This is because we need
276 the driver to pass all .go files to go1. Without a -o option the
277 driver will invoke go1 separately for each input file. */
278 if (library < 0 && first_go_file != NULL && !saw_opt_o)
285 base = lbasename (first_go_file);
286 baselen = strlen (base) - 3;
288 out = XNEWVEC (char, alen);
289 memcpy (out, base, baselen);
290 /* The driver will convert .o to some other suffix (e.g., .obj)
294 out[baselen + 1] = 's';
296 out[baselen + 1] = 'o';
297 out[baselen + 2] = '\0';
298 generate_option (OPT_o, out, 1, CL_DRIVER,
299 &new_decoded_options[j]);
303 /* Add `-lgo' if we haven't already done so. */
306 generate_option (OPT_l, LIBGOBEGIN, 1, CL_DRIVER,
307 &new_decoded_options[j]);
311 #ifdef HAVE_LD_STATIC_DYNAMIC
312 if (library > 1 && !static_link)
314 generate_option (OPT_Wl_, LD_STATIC_OPTION, 1, CL_DRIVER,
315 &new_decoded_options[j]);
320 generate_option (OPT_l, saw_profile_flag ? LIBGO_PROFILE : LIBGO, 1,
321 CL_DRIVER, &new_decoded_options[j]);
325 #ifdef HAVE_LD_STATIC_DYNAMIC
326 if (library > 1 && !static_link)
328 generate_option (OPT_Wl_, LD_DYNAMIC_OPTION, 1, CL_DRIVER,
329 &new_decoded_options[j]);
334 /* When linking libgo statically we also need to link with the
336 if (library > 1 || static_link)
341 new_decoded_options[j++] = *saw_thread;
342 else if (library > 0 && need_thread)
344 generate_option (OPT_l,
346 ? THREAD_LIBRARY_PROFILE
348 1, CL_DRIVER, &new_decoded_options[j]);
354 new_decoded_options[j++] = *saw_math;
355 else if (library > 0 && need_math)
357 generate_option (OPT_l,
358 saw_profile_flag ? MATH_LIBRARY_PROFILE : MATH_LIBRARY,
359 1, CL_DRIVER, &new_decoded_options[j]);
365 new_decoded_options[j++] = *saw_libc;
366 if (shared_libgcc && !static_link)
367 generate_option (OPT_shared_libgcc, NULL, 1, CL_DRIVER,
368 &new_decoded_options[j++]);
370 *in_decoded_options_count = j;
371 *in_decoded_options = new_decoded_options;
372 *in_added_libraries = added_libraries;
375 /* Called before linking. Returns 0 on success and -1 on failure. */
376 int lang_specific_pre_link (void) /* Not used for Go. */
381 /* Number of extra output files that lang_specific_pre_link may generate. */
382 int lang_specific_extra_outfiles = 0; /* Not used for Go. */