1 /* Specific flags and argument handling of the C++ front end.
2 Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
3 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
4
5 This file is part of GCC.
6
7 GCC is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3, or (at your option)
10 any later version.
11
12 GCC is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING3. If not see
19 <http://www.gnu.org/licenses/>. */
20
21 #include "config.h"
22 #include "system.h"
23 #include "coretypes.h"
24 #include "tm.h"
25 #include "gcc.h"
26 #include "opts.h"
27
28 /* This bit is set if we saw a `-xfoo' language specification. */
29 #define LANGSPEC (1<<1)
30 /* This bit is set if they did `-lm' or `-lmath'. */
31 #define MATHLIB (1<<2)
32 /* This bit is set if they did `-lc'. */
33 #define WITHLIBC (1<<3)
34 /* Skip this option. */
35 #define SKIPOPT (1<<4)
36
37 #ifndef MATH_LIBRARY
38 #define MATH_LIBRARY "m"
39 #endif
40 #ifndef MATH_LIBRARY_PROFILE
41 #define MATH_LIBRARY_PROFILE MATH_LIBRARY
42 #endif
43
44 #ifndef LIBSTDCXX
45 #define LIBSTDCXX "stdc++"
46 #endif
47 #ifndef LIBSTDCXX_PROFILE
48 #define LIBSTDCXX_PROFILE LIBSTDCXX
49 #endif
50 #ifndef LIBSTDCXX_STATIC
51 #define LIBSTDCXX_STATIC NULL
52 #endif
53
54 void
lang_specific_driver(struct cl_decoded_option ** in_decoded_options,unsigned int * in_decoded_options_count,int * in_added_libraries)55 lang_specific_driver (struct cl_decoded_option **in_decoded_options,
56 unsigned int *in_decoded_options_count,
57 int *in_added_libraries)
58 {
59 unsigned int i, j;
60
61 /* If nonzero, the user gave us the `-p' or `-pg' flag. */
62 int saw_profile_flag = 0;
63
64 /* What do with libstdc++:
65 -1 means we should not link in libstdc++
66 0 means we should link in libstdc++ if it is needed
67 1 means libstdc++ is needed and should be linked in.
68 2 means libstdc++ is needed and should be linked statically. */
69 int library = 0;
70
71 /* The number of arguments being added to what's in argv, other than
72 libraries. We use this to track the number of times we've inserted
73 -xc++/-xnone. */
74 int added = 0;
75
76 /* The new argument list will be contained in this. */
77 struct cl_decoded_option *new_decoded_options;
78
79 /* Nonzero if we saw a `-xfoo' language specification on the
80 command line. Used to avoid adding our own -xc++ if the user
81 already gave a language for the file. */
82 int saw_speclang = 0;
83
84 /* "-lm" or "-lmath" if it appears on the command line. */
85 const struct cl_decoded_option *saw_math = NULL;
86
87 /* "-lc" if it appears on the command line. */
88 const struct cl_decoded_option *saw_libc = NULL;
89
90 /* An array used to flag each argument that needs a bit set for
91 LANGSPEC, MATHLIB, or WITHLIBC. */
92 int *args;
93
94 /* By default, we throw on the math library if we have one. */
95 int need_math = (MATH_LIBRARY[0] != '\0');
96
97 /* True if we saw -static. */
98 int static_link = 0;
99
100 /* True if we should add -shared-libgcc to the command-line. */
101 int shared_libgcc = 1;
102
103 /* The total number of arguments with the new stuff. */
104 unsigned int argc;
105
106 /* The argument list. */
107 struct cl_decoded_option *decoded_options;
108
109 /* The number of libraries added in. */
110 int added_libraries;
111
112 /* The total number of arguments with the new stuff. */
113 unsigned int num_args = 1;
114
115 argc = *in_decoded_options_count;
116 decoded_options = *in_decoded_options;
117 added_libraries = *in_added_libraries;
118
119 args = XCNEWVEC (int, argc);
120
121 for (i = 1; i < argc; i++)
122 {
123 const char *arg = decoded_options[i].arg;
124 if (decoded_options[i].errors & CL_ERR_MISSING_ARG)
125 continue; /* Avoid examining arguments of options missing them. */
126
127 switch (decoded_options[i].opt_index)
128 {
129 case OPT_nostdlib:
130 case OPT_nodefaultlibs:
131 library = -1;
132 break;
133
134 case OPT_l:
135 if (strcmp (arg, MATH_LIBRARY) == 0)
136 {
137 args[i] |= MATHLIB;
138 need_math = 0;
139 }
140 else if (strcmp (arg, "c") == 0)
141 args[i] |= WITHLIBC;
142 else
143 /* Unrecognized libraries (e.g. -lfoo) may require libstdc++. */
144 library = (library == 0) ? 1 : library;
145 break;
146
147 case OPT_pg:
148 case OPT_p:
149 saw_profile_flag++;
150 break;
151
152 case OPT_x:
153 if (library == 0
154 && (strcmp (arg, "c++") == 0
155 || strcmp (arg, "c++-cpp-output") == 0
156 || strcmp (arg, "objective-c++") == 0
157 || strcmp (arg, "objective-c++-cpp-output") == 0))
158 library = 1;
159
160 saw_speclang = 1;
161 break;
162
163 case OPT_Xlinker:
164 case OPT_Wl_:
165 /* Arguments that go directly to the linker might be .o files,
166 or something, and so might cause libstdc++ to be needed. */
167 if (library == 0)
168 library = 1;
169 break;
170
171 case OPT_c:
172 case OPT_S:
173 case OPT_E:
174 case OPT_M:
175 case OPT_MM:
176 case OPT_fsyntax_only:
177 /* Don't specify libraries if we won't link, since that would
178 cause a warning. */
179 library = -1;
180 break;
181
182 case OPT_static:
183 static_link = 1;
184 break;
185
186 case OPT_static_libgcc:
187 shared_libgcc = 0;
188 break;
189
190 case OPT_static_libstdc__:
191 library = library >= 0 ? 2 : library;
192 args[i] |= SKIPOPT;
193 break;
194
195 case OPT_SPECIAL_input_file:
196 {
197 int len;
198
199 /* We don't do this anymore, since we don't get them with minus
200 signs on them. */
201 if (arg[0] == '\0' || arg[1] == '\0')
202 continue;
203
204 if (saw_speclang)
205 {
206 saw_speclang = 0;
207 continue;
208 }
209
210 /* If the filename ends in .[chi], put options around it.
211 But not if a specified -x option is currently active. */
212 len = strlen (arg);
213 if (len > 2
214 && (arg[len - 1] == 'c'
215 || arg[len - 1] == 'i'
216 || arg[len - 1] == 'h')
217 && arg[len - 2] == '.')
218 {
219 args[i] |= LANGSPEC;
220 added += 2;
221 }
222
223 /* If we don't know that this is a header file, we might
224 need to be linking in the libraries. */
225 if (library == 0)
226 {
227 if ((len <= 2 || strcmp (arg + (len - 2), ".H") != 0)
228 && (len <= 2 || strcmp (arg + (len - 2), ".h") != 0)
229 && (len <= 4 || strcmp (arg + (len - 4), ".hpp") != 0)
230 && (len <= 3 || strcmp (arg + (len - 3), ".hp") != 0)
231 && (len <= 4 || strcmp (arg + (len - 4), ".hxx") != 0)
232 && (len <= 4 || strcmp (arg + (len - 4), ".h++") != 0)
233 && (len <= 4 || strcmp (arg + (len - 4), ".HPP") != 0)
234 && (len <= 4 || strcmp (arg + (len - 4), ".tcc") != 0)
235 && (len <= 3 || strcmp (arg + (len - 3), ".hh") != 0))
236 library = 1;
237 }
238 }
239 break;
240 }
241 }
242
243 /* There's no point adding -shared-libgcc if we don't have a shared
244 libgcc. */
245 #ifndef ENABLE_SHARED_LIBGCC
246 shared_libgcc = 0;
247 #endif
248
249 /* Add one for shared_libgcc or extra static library. */
250 num_args = argc + added + need_math + (library > 0) * 4 + 1;
251 new_decoded_options = XNEWVEC (struct cl_decoded_option, num_args);
252
253 i = 0;
254 j = 0;
255
256 /* Copy the 0th argument, i.e., the name of the program itself. */
257 new_decoded_options[j++] = decoded_options[i++];
258
259 /* NOTE: We start at 1 now, not 0. */
260 while (i < argc)
261 {
262 new_decoded_options[j] = decoded_options[i];
263
264 /* Make sure -lstdc++ is before the math library, since libstdc++
265 itself uses those math routines. */
266 if (!saw_math && (args[i] & MATHLIB) && library > 0)
267 {
268 --j;
269 saw_math = &decoded_options[i];
270 }
271
272 if (!saw_libc && (args[i] & WITHLIBC) && library > 0)
273 {
274 --j;
275 saw_libc = &decoded_options[i];
276 }
277
278 /* Wrap foo.[chi] files in a language specification to
279 force the gcc compiler driver to run cc1plus on them. */
280 if (args[i] & LANGSPEC)
281 {
282 const char *arg = decoded_options[i].arg;
283 int len = strlen (arg);
284 switch (arg[len - 1])
285 {
286 case 'c':
287 generate_option (OPT_x, "c++", 1, CL_DRIVER,
288 &new_decoded_options[j++]);
289 break;
290 case 'i':
291 generate_option (OPT_x, "c++-cpp-output", 1, CL_DRIVER,
292 &new_decoded_options[j++]);
293 break;
294 case 'h':
295 generate_option (OPT_x, "c++-header", 1, CL_DRIVER,
296 &new_decoded_options[j++]);
297 break;
298 default:
299 gcc_unreachable ();
300 }
301 new_decoded_options[j++] = decoded_options[i];
302 generate_option (OPT_x, "none", 1, CL_DRIVER,
303 &new_decoded_options[j]);
304 }
305
306 if ((args[i] & SKIPOPT) != 0)
307 --j;
308
309 i++;
310 j++;
311 }
312
313 /* Add `-lstdc++' if we haven't already done so. */
314 if (library > 0)
315 {
316 #ifdef HAVE_LD_STATIC_DYNAMIC
317 if (library > 1 && !static_link)
318 {
319 generate_option (OPT_Wl_, LD_STATIC_OPTION, 1, CL_DRIVER,
320 &new_decoded_options[j]);
321 j++;
322 }
323 #endif
324 generate_option (OPT_l,
325 saw_profile_flag ? LIBSTDCXX_PROFILE : LIBSTDCXX, 1,
326 CL_DRIVER, &new_decoded_options[j]);
327 added_libraries++;
328 j++;
329 /* Add target-dependent static library, if necessary. */
330 if ((static_link || library > 1) && LIBSTDCXX_STATIC != NULL)
331 {
332 generate_option (OPT_l, LIBSTDCXX_STATIC, 1,
333 CL_DRIVER, &new_decoded_options[j]);
334 added_libraries++;
335 j++;
336 }
337 #ifdef HAVE_LD_STATIC_DYNAMIC
338 if (library > 1 && !static_link)
339 {
340 generate_option (OPT_Wl_, LD_DYNAMIC_OPTION, 1, CL_DRIVER,
341 &new_decoded_options[j]);
342 j++;
343 }
344 #endif
345 }
346 if (saw_math)
347 new_decoded_options[j++] = *saw_math;
348 else if (library > 0 && need_math)
349 {
350 generate_option (OPT_l,
351 saw_profile_flag ? MATH_LIBRARY_PROFILE : MATH_LIBRARY,
352 1, CL_DRIVER, &new_decoded_options[j]);
353 added_libraries++;
354 j++;
355 }
356 if (saw_libc)
357 new_decoded_options[j++] = *saw_libc;
358 if (shared_libgcc && !static_link)
359 generate_option (OPT_shared_libgcc, NULL, 1, CL_DRIVER,
360 &new_decoded_options[j++]);
361
362 *in_decoded_options_count = j;
363 *in_decoded_options = new_decoded_options;
364 *in_added_libraries = added_libraries;
365 }
366
367 /* Called before linking. Returns 0 on success and -1 on failure. */
lang_specific_pre_link(void)368 int lang_specific_pre_link (void) /* Not used for C++. */
369 {
370 return 0;
371 }
372
373 /* Number of extra output files that lang_specific_pre_link may generate. */
374 int lang_specific_extra_outfiles = 0; /* Not used for C++. */
375