1 /* Specific flags and argument handling of the C++ front end.
2 Copyright (C) 1996-2015 Free Software Foundation, Inc.
4 This file is part of GCC.
6 GCC is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3, or (at your option)
11 GCC is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
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 `-lrt' or equivalent. */
32 #define TIMELIB (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
46 #define TIME_LIBRARY ""
50 #define LIBSTDCXX "stdc++"
52 #ifndef LIBSTDCXX_PROFILE
53 #define LIBSTDCXX_PROFILE LIBSTDCXX
55 #ifndef LIBSTDCXX_STATIC
56 #define LIBSTDCXX_STATIC NULL
60 lang_specific_driver (struct cl_decoded_option **in_decoded_options,
61 unsigned int *in_decoded_options_count,
62 int *in_added_libraries)
66 /* If nonzero, the user gave us the `-p' or `-pg' flag. */
67 int saw_profile_flag = 0;
69 /* What do with libstdc++:
70 -1 means we should not link in libstdc++
71 0 means we should link in libstdc++ if it is needed
72 1 means libstdc++ is needed and should be linked in.
73 2 means libstdc++ is needed and should be linked statically. */
76 /* The number of arguments being added to what's in argv, other than
77 libraries. We use this to track the number of times we've inserted
81 /* The new argument list will be contained in this. */
82 struct cl_decoded_option *new_decoded_options;
84 /* Nonzero if we saw a `-xfoo' language specification on the
85 command line. Used to avoid adding our own -xc++ if the user
86 already gave a language for the file. */
89 /* "-lm" or "-lmath" if it appears on the command line. */
90 const struct cl_decoded_option *saw_math = NULL;
92 /* "-lrt" or eqivalent if it appears on the command line. */
93 const struct cl_decoded_option *saw_time = NULL;
95 /* "-lc" if it appears on the command line. */
96 const struct cl_decoded_option *saw_libc = NULL;
98 /* An array used to flag each argument that needs a bit set for
99 LANGSPEC, MATHLIB, TIMELIB, or WITHLIBC. */
102 /* By default, we throw on the math library if we have one. */
103 int need_math = (MATH_LIBRARY[0] != '\0');
105 /* By default, we throw on the time library if we have one. */
106 int need_time = (TIME_LIBRARY[0] != '\0');
108 /* True if we saw -static. */
111 /* True if we should add -shared-libgcc to the command-line. */
112 int shared_libgcc = 1;
114 /* The total number of arguments with the new stuff. */
117 /* The argument list. */
118 struct cl_decoded_option *decoded_options;
120 /* The number of libraries added in. */
123 /* The total number of arguments with the new stuff. */
124 unsigned int num_args = 1;
126 argc = *in_decoded_options_count;
127 decoded_options = *in_decoded_options;
128 added_libraries = *in_added_libraries;
130 args = XCNEWVEC (int, argc);
132 for (i = 1; i < argc; i++)
134 const char *arg = decoded_options[i].arg;
135 if (decoded_options[i].errors & CL_ERR_MISSING_ARG)
136 continue; /* Avoid examining arguments of options missing them. */
138 switch (decoded_options[i].opt_index)
141 case OPT_nodefaultlibs:
146 if (strcmp (arg, MATH_LIBRARY) == 0)
151 else if (strcmp (arg, TIME_LIBRARY) == 0)
156 else if (strcmp (arg, "c") == 0)
159 /* Unrecognized libraries (e.g. -lfoo) may require libstdc++. */
160 library = (library == 0) ? 1 : library;
170 && (strcmp (arg, "c++") == 0
171 || strcmp (arg, "c++-cpp-output") == 0
172 || strcmp (arg, "objective-c++") == 0
173 || strcmp (arg, "objective-c++-cpp-output") == 0))
181 /* Arguments that go directly to the linker might be .o files,
182 or something, and so might cause libstdc++ to be needed. */
192 case OPT_fsyntax_only:
193 /* Don't specify libraries if we won't link, since that would
202 case OPT_static_libgcc:
206 case OPT_static_libstdc__:
207 library = library >= 0 ? 2 : library;
211 case OPT_SPECIAL_input_file:
215 /* We don't do this anymore, since we don't get them with minus
217 if (arg[0] == '\0' || arg[1] == '\0')
226 /* If the filename ends in .[chi], put options around it.
227 But not if a specified -x option is currently active. */
230 && (arg[len - 1] == 'c'
231 || arg[len - 1] == 'i'
232 || arg[len - 1] == 'h')
233 && arg[len - 2] == '.')
239 /* If we don't know that this is a header file, we might
240 need to be linking in the libraries. */
243 if ((len <= 2 || strcmp (arg + (len - 2), ".H") != 0)
244 && (len <= 2 || strcmp (arg + (len - 2), ".h") != 0)
245 && (len <= 4 || strcmp (arg + (len - 4), ".hpp") != 0)
246 && (len <= 3 || strcmp (arg + (len - 3), ".hp") != 0)
247 && (len <= 4 || strcmp (arg + (len - 4), ".hxx") != 0)
248 && (len <= 4 || strcmp (arg + (len - 4), ".h++") != 0)
249 && (len <= 4 || strcmp (arg + (len - 4), ".HPP") != 0)
250 && (len <= 4 || strcmp (arg + (len - 4), ".tcc") != 0)
251 && (len <= 3 || strcmp (arg + (len - 3), ".hh") != 0))
259 /* There's no point adding -shared-libgcc if we don't have a shared
261 #ifndef ENABLE_SHARED_LIBGCC
265 /* Add one for shared_libgcc or extra static library. */
266 num_args = argc + added + need_math + (library > 0) * 4 + 1;
267 new_decoded_options = XNEWVEC (struct cl_decoded_option, num_args);
272 /* Copy the 0th argument, i.e., the name of the program itself. */
273 new_decoded_options[j++] = decoded_options[i++];
275 /* NOTE: We start at 1 now, not 0. */
278 new_decoded_options[j] = decoded_options[i];
280 /* Make sure -lstdc++ is before the math library, since libstdc++
281 itself uses those math routines. */
282 if (!saw_math && (args[i] & MATHLIB) && library > 0)
285 saw_math = &decoded_options[i];
288 if (!saw_time && (args[i] & TIMELIB) && library > 0)
291 saw_time = &decoded_options[i];
294 if (!saw_libc && (args[i] & WITHLIBC) && library > 0)
297 saw_libc = &decoded_options[i];
300 /* Wrap foo.[chi] files in a language specification to
301 force the gcc compiler driver to run cc1plus on them. */
302 if (args[i] & LANGSPEC)
304 const char *arg = decoded_options[i].arg;
305 int len = strlen (arg);
306 switch (arg[len - 1])
309 generate_option (OPT_x, "c++", 1, CL_DRIVER,
310 &new_decoded_options[j++]);
313 generate_option (OPT_x, "c++-cpp-output", 1, CL_DRIVER,
314 &new_decoded_options[j++]);
317 generate_option (OPT_x, "c++-header", 1, CL_DRIVER,
318 &new_decoded_options[j++]);
323 new_decoded_options[j++] = decoded_options[i];
324 generate_option (OPT_x, "none", 1, CL_DRIVER,
325 &new_decoded_options[j]);
328 if ((args[i] & SKIPOPT) != 0)
335 /* Add `-lstdc++' if we haven't already done so. */
338 #ifdef HAVE_LD_STATIC_DYNAMIC
339 if (library > 1 && !static_link)
341 generate_option (OPT_Wl_, LD_STATIC_OPTION, 1, CL_DRIVER,
342 &new_decoded_options[j]);
346 generate_option (OPT_l,
347 saw_profile_flag ? LIBSTDCXX_PROFILE : LIBSTDCXX, 1,
348 CL_DRIVER, &new_decoded_options[j]);
351 /* Add target-dependent static library, if necessary. */
352 if ((static_link || library > 1) && LIBSTDCXX_STATIC != NULL)
354 generate_option (OPT_l, LIBSTDCXX_STATIC, 1,
355 CL_DRIVER, &new_decoded_options[j]);
359 #ifdef HAVE_LD_STATIC_DYNAMIC
360 if (library > 1 && !static_link)
362 generate_option (OPT_Wl_, LD_DYNAMIC_OPTION, 1, CL_DRIVER,
363 &new_decoded_options[j]);
369 new_decoded_options[j++] = *saw_math;
370 else if (library > 0 && need_math)
372 generate_option (OPT_l,
373 saw_profile_flag ? MATH_LIBRARY_PROFILE : MATH_LIBRARY,
374 1, CL_DRIVER, &new_decoded_options[j]);
379 new_decoded_options[j++] = *saw_time;
380 else if (library > 0 && need_time)
382 generate_option (OPT_l, TIME_LIBRARY, 1, CL_DRIVER,
383 &new_decoded_options[j]);
388 new_decoded_options[j++] = *saw_libc;
389 if (shared_libgcc && !static_link)
390 generate_option (OPT_shared_libgcc, NULL, 1, CL_DRIVER,
391 &new_decoded_options[j++]);
393 *in_decoded_options_count = j;
394 *in_decoded_options = new_decoded_options;
395 *in_added_libraries = added_libraries;
398 /* Called before linking. Returns 0 on success and -1 on failure. */
399 int lang_specific_pre_link (void) /* Not used for C++. */
404 /* Number of extra output files that lang_specific_pre_link may generate. */
405 int lang_specific_extra_outfiles = 0; /* Not used for C++. */