Line data Source code
1 : /* Specific flags and argument handling of the C++ front end.
2 : Copyright (C) 1996-2026 Free Software Foundation, Inc.
3 :
4 : This file is part of GCC.
5 :
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)
9 : any later version.
10 :
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.
15 :
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/>. */
19 :
20 : #include "config.h"
21 : #include "system.h"
22 : #include "coretypes.h"
23 : #include "tm.h"
24 : #include "opts.h"
25 :
26 : /* This bit is set if we saw a `-xfoo' language specification. */
27 : #define LANGSPEC (1<<1)
28 : /* This bit is set if they did `-lm' or `-lmath'. */
29 : #define MATHLIB (1<<2)
30 : /* This bit is set if they did `-lc'. */
31 : #define WITHLIBC (1<<3)
32 : /* Skip this option. */
33 : #define SKIPOPT (1<<4)
34 : /* Add -lstdc++exp for experimental features that need library support. */
35 : #define EXPERIMENTAL (1<<5)
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 : #ifndef LIBCXX
55 : #define LIBCXX "c++"
56 : #endif
57 : #ifndef LIBCXX_PROFILE
58 : #define LIBCXX_PROFILE LIBCXX
59 : #endif
60 : #ifndef LIBCXX_STATIC
61 : #define LIBCXX_STATIC NULL
62 : #endif
63 :
64 : #ifndef LIBCXXABI
65 : #define LIBCXXABI "c++abi"
66 : #endif
67 : #ifndef LIBCXXABI_PROFILE
68 : #define LIBCXXABI_PROFILE LIBCXXABI
69 : #endif
70 : #ifndef LIBCXXABI_STATIC
71 : #define LIBCXXABI_STATIC NULL
72 : #endif
73 :
74 : /* The values used here must match those of the stdlib_kind enumeration
75 : in c.opt. */
76 : enum stdcxxlib_kind
77 : {
78 : USE_LIBSTDCXX = 1,
79 : USE_LIBCXX = 2
80 : };
81 :
82 : void
83 102879 : lang_specific_driver (struct cl_decoded_option **in_decoded_options,
84 : unsigned int *in_decoded_options_count,
85 : int *in_added_libraries)
86 : {
87 102879 : unsigned int i, j;
88 :
89 : /* If nonzero, the user gave us the `-p' or `-pg' flag. */
90 102879 : int saw_profile_flag = 0;
91 :
92 : /* What action to take for the c++ runtime library:
93 : -1 means we should not link it in.
94 : 0 means we should link it if it is needed.
95 : 1 means it is needed and should be linked in.
96 : 2 means it is needed but should be linked statically. */
97 102879 : int library = 0;
98 :
99 : /* Which c++ runtime library to link. */
100 102879 : stdcxxlib_kind which_library = USE_LIBSTDCXX;
101 :
102 : /* The number of arguments being added to what's in argv, other than
103 : libraries. We use this to track the number of times we've inserted
104 : -xc++/-xnone. */
105 102879 : int added = 0;
106 :
107 : /* The new argument list will be contained in this. */
108 102879 : struct cl_decoded_option *new_decoded_options;
109 :
110 : /* Nonzero if we saw a `-xfoo' language specification on the
111 : command line. Used to avoid adding our own -xc++ if the user
112 : already gave a language for the file. */
113 102879 : int saw_speclang = 0;
114 :
115 : /* "-lm" or "-lmath" if it appears on the command line. */
116 102879 : const struct cl_decoded_option *saw_math = NULL;
117 :
118 : /* "-lrt" or eqivalent if it appears on the command line. */
119 102879 : const struct cl_decoded_option *saw_time = NULL;
120 :
121 : /* "-lc" if it appears on the command line. */
122 102879 : const struct cl_decoded_option *saw_libc = NULL;
123 :
124 : /* An array used to flag each argument that needs a bit set for
125 : LANGSPEC, MATHLIB, or WITHLIBC. */
126 102879 : int *args;
127 :
128 : /* By default, we throw on the math library if we have one. */
129 102879 : int need_math = (MATH_LIBRARY[0] != '\0');
130 :
131 : /* By default, we don't add -lstdc++exp. */
132 102879 : bool need_experimental = false;
133 :
134 : /* Whether to also compile module std. */
135 102879 : bool std_module = false;
136 :
137 : /* True if we saw -static. */
138 102879 : int static_link = 0;
139 :
140 : /* True if we should add -shared-libgcc to the command-line. */
141 102879 : int shared_libgcc = 1;
142 :
143 : /* The total number of arguments with the new stuff. */
144 102879 : unsigned int argc;
145 :
146 : /* The argument list. */
147 102879 : struct cl_decoded_option *decoded_options;
148 :
149 : /* The number of libraries added in. */
150 102879 : int added_libraries;
151 :
152 : /* The total number of arguments with the new stuff. */
153 102879 : unsigned int num_args = 1;
154 :
155 102879 : argc = *in_decoded_options_count;
156 102879 : decoded_options = *in_decoded_options;
157 102879 : added_libraries = *in_added_libraries;
158 :
159 102879 : args = XCNEWVEC (int, argc);
160 :
161 2701223 : for (i = 1; i < argc; i++)
162 : {
163 2598344 : const char *arg = decoded_options[i].arg;
164 2598344 : if (decoded_options[i].errors & CL_ERR_MISSING_ARG)
165 0 : continue; /* Avoid examining arguments of options missing them. */
166 :
167 2598344 : switch (decoded_options[i].opt_index)
168 : {
169 : case OPT_fcontracts:
170 2598344 : need_experimental = true;
171 : break;
172 :
173 3 : case OPT_nostdlib__:
174 3 : args[i] |= SKIPOPT;
175 : /* FALLTHRU */
176 : case OPT_nostdlib:
177 : case OPT_nodefaultlibs:
178 : library = -1;
179 : break;
180 :
181 21082 : case OPT_l:
182 21082 : if (strcmp (arg, MATH_LIBRARY) == 0)
183 : {
184 20876 : args[i] |= MATHLIB;
185 20876 : need_math = 0;
186 : }
187 206 : else if (strcmp (arg, "c") == 0)
188 0 : args[i] |= WITHLIBC;
189 : else
190 : /* Unrecognized libraries (e.g. -lfoo) may require libstdc++. */
191 206 : library = (library == 0) ? 1 : library;
192 : break;
193 :
194 91 : case OPT_pg:
195 91 : case OPT_p:
196 91 : saw_profile_flag++;
197 91 : break;
198 :
199 2917 : case OPT_x:
200 2917 : if (library == 0
201 2861 : && (strcmp (arg, "c++") == 0
202 2861 : || strcmp (arg, "c++-cpp-output") == 0
203 2861 : || strcmp (arg, "objective-c++") == 0
204 2861 : || strcmp (arg, "objective-c++-cpp-output") == 0))
205 0 : library = 1;
206 :
207 : saw_speclang = 1;
208 : break;
209 :
210 6373 : case OPT_Xlinker:
211 6373 : case OPT_Wl_:
212 : /* Arguments that go directly to the linker might be .o files,
213 : or something, and so might cause libstdc++ to be needed. */
214 6373 : if (library == 0)
215 2598344 : library = 1;
216 : break;
217 :
218 78133 : case OPT_c:
219 78133 : case OPT_r:
220 78133 : case OPT_S:
221 78133 : case OPT_E:
222 78133 : case OPT_M:
223 78133 : case OPT_MM:
224 78133 : case OPT_fsyntax_only:
225 : /* Don't specify libraries if we won't link, since that would
226 : cause a warning. */
227 78133 : library = -1;
228 78133 : break;
229 :
230 27 : case OPT_static:
231 27 : static_link = 1;
232 27 : break;
233 :
234 1 : case OPT_static_libgcc:
235 1 : shared_libgcc = 0;
236 1 : break;
237 :
238 8 : case OPT_static_libstdc__:
239 8 : library = library >= 0 ? 2 : library;
240 : #ifdef HAVE_LD_STATIC_DYNAMIC
241 : /* Remove -static-libstdc++ from the command only if target supports
242 : LD_STATIC_DYNAMIC. When not supported, it is left in so that a
243 : back-end target can use outfile substitution. */
244 8 : args[i] |= SKIPOPT;
245 : #endif
246 8 : break;
247 :
248 0 : case OPT_stdlib_:
249 0 : which_library = (stdcxxlib_kind) decoded_options[i].value;
250 0 : break;
251 :
252 1 : case OPT__compile_std_module:
253 1 : std_module = true;
254 1 : break;
255 :
256 106647 : case OPT_SPECIAL_input_file:
257 106647 : {
258 106647 : int len;
259 :
260 : /* We don't do this anymore, since we don't get them with minus
261 : signs on them. */
262 106647 : if (arg[0] == '\0' || arg[1] == '\0')
263 0 : continue;
264 :
265 106647 : if (saw_speclang)
266 : {
267 2908 : saw_speclang = 0;
268 2908 : continue;
269 : }
270 :
271 : /* If the filename ends in .[chi], put options around it.
272 : But not if a specified -x option is currently active. */
273 103739 : len = strlen (arg);
274 103739 : if (len > 2
275 103739 : && (arg[len - 1] == 'c'
276 77843 : || arg[len - 1] == 'i'
277 77843 : || arg[len - 1] == 'h')
278 25896 : && arg[len - 2] == '.')
279 : {
280 13340 : args[i] |= LANGSPEC;
281 13340 : added += 2;
282 : }
283 :
284 : /* If we don't know that this is a header file, we might
285 : need to be linking in the libraries. */
286 103739 : if (library == 0)
287 : {
288 85958 : if ((len <= 2 || strcmp (arg + (len - 2), ".H") != 0)
289 85958 : && (len <= 2 || strcmp (arg + (len - 2), ".h") != 0)
290 84984 : && (len <= 4 || strcmp (arg + (len - 4), ".hpp") != 0)
291 84984 : && (len <= 3 || strcmp (arg + (len - 3), ".hp") != 0)
292 84984 : && (len <= 4 || strcmp (arg + (len - 4), ".hxx") != 0)
293 84984 : && (len <= 4 || strcmp (arg + (len - 4), ".h++") != 0)
294 84984 : && (len <= 4 || strcmp (arg + (len - 4), ".HPP") != 0)
295 84984 : && (len <= 4 || strcmp (arg + (len - 4), ".tcc") != 0)
296 84984 : && (len <= 3 || strcmp (arg + (len - 3), ".hh") != 0))
297 2598344 : library = 1;
298 : }
299 : }
300 : break;
301 : }
302 : }
303 :
304 : /* There's no point adding -shared-libgcc if we don't have a shared
305 : libgcc. */
306 : #ifndef ENABLE_SHARED_LIBGCC
307 : shared_libgcc = 0;
308 : #endif
309 :
310 : /* Add one for shared_libgcc or extra static library. */
311 205758 : num_args = (argc + added + need_math + need_experimental
312 102879 : + (std_module * 5)
313 102879 : + (library > 0) * 4 + 1);
314 : /* For libc++, on most platforms, the ABI library (usually called libc++abi)
315 : is provided as a separate DSO, which we must also append.
316 : However, a platform might have the ability to forward the ABI library
317 : from libc++, or combine it in some other way; in that case, LIBCXXABI
318 : should be set to NULL to signal that it need not be appended. */
319 102879 : if (which_library == USE_LIBCXX && LIBCXXABI != NULL)
320 0 : num_args += 4;
321 102879 : new_decoded_options = XNEWVEC (struct cl_decoded_option, num_args);
322 :
323 102879 : i = 0;
324 102879 : j = 0;
325 :
326 : /* Copy the 0th argument, i.e., the name of the program itself. */
327 102879 : new_decoded_options[j++] = decoded_options[i++];
328 :
329 : /* NOTE: We start at 1 now, not 0. */
330 2701223 : while (i < argc)
331 : {
332 2598344 : new_decoded_options[j] = decoded_options[i];
333 :
334 : /* Make sure -lstdc++ is before the math library, since libstdc++
335 : itself uses those math routines. */
336 2598344 : if (!saw_math && (args[i] & MATHLIB) && library > 0)
337 : {
338 20868 : --j;
339 20868 : saw_math = &decoded_options[i];
340 : }
341 :
342 2598344 : if (!saw_libc && (args[i] & WITHLIBC) && library > 0)
343 : {
344 0 : --j;
345 0 : saw_libc = &decoded_options[i];
346 : }
347 :
348 : /* Insert --compile-std-module options before any -x or source files. */
349 2598344 : size_t opt = decoded_options[i].opt_index;
350 2598344 : if (std_module
351 4 : && (opt == OPT__compile_std_module
352 4 : || opt == OPT_SPECIAL_input_file
353 3 : || opt == OPT_x))
354 : {
355 1 : generate_option (OPT_x, "c++-system-header", 1, CL_DRIVER,
356 1 : &new_decoded_options[j++]);
357 1 : generate_option_input_file ("bits/stdc++.h",
358 1 : &new_decoded_options[j]);
359 : /* Tell process_command that this file was added by the driver. */
360 1 : new_decoded_options[j++].mask = CL_DRIVER;
361 1 : generate_option (OPT_x, "c++-system-module", 1, CL_DRIVER,
362 1 : &new_decoded_options[j++]);
363 1 : generate_option_input_file ("bits/std.cc",
364 1 : &new_decoded_options[j]);
365 1 : new_decoded_options[j++].mask = CL_DRIVER;
366 1 : generate_option_input_file ("bits/std.compat.cc",
367 1 : &new_decoded_options[j]);
368 1 : new_decoded_options[j++].mask = CL_DRIVER;
369 1 : generate_option (OPT_x, "none", 1, CL_DRIVER,
370 1 : &new_decoded_options[j++]);
371 1 : new_decoded_options[j] = decoded_options[i];
372 1 : std_module = false;
373 : }
374 2598344 : if (opt == OPT__compile_std_module)
375 1 : --j;
376 :
377 : /* Wrap foo.[chi] files in a language specification to
378 : force the gcc compiler driver to run cc1plus on them. */
379 2598344 : if (args[i] & LANGSPEC)
380 : {
381 13340 : const char *arg = decoded_options[i].arg;
382 13340 : int len = strlen (arg);
383 13340 : switch (arg[len - 1])
384 : {
385 13340 : case 'c':
386 13340 : generate_option (OPT_x, "c++", 1, CL_DRIVER,
387 13340 : &new_decoded_options[j++]);
388 13340 : break;
389 0 : case 'i':
390 0 : generate_option (OPT_x, "c++-cpp-output", 1, CL_DRIVER,
391 0 : &new_decoded_options[j++]);
392 0 : break;
393 0 : case 'h':
394 0 : generate_option (OPT_x, "c++-header", 1, CL_DRIVER,
395 0 : &new_decoded_options[j++]);
396 0 : break;
397 0 : default:
398 0 : gcc_unreachable ();
399 : }
400 13340 : new_decoded_options[j++] = decoded_options[i];
401 13340 : generate_option (OPT_x, "none", 1, CL_DRIVER,
402 13340 : &new_decoded_options[j]);
403 : }
404 :
405 2598344 : if ((args[i] & SKIPOPT) != 0)
406 11 : --j;
407 :
408 2598344 : i++;
409 2598344 : j++;
410 : }
411 :
412 : /* Add `-lstdc++' if we haven't already done so. */
413 102879 : if (library > 0)
414 : {
415 21288 : if (need_experimental && which_library == USE_LIBSTDCXX)
416 : {
417 51 : generate_option (OPT_l, "stdc++exp", 1, CL_DRIVER,
418 51 : &new_decoded_options[j++]);
419 51 : ++added_libraries;
420 : }
421 : #ifdef HAVE_LD_STATIC_DYNAMIC
422 21288 : if (library > 1 && !static_link)
423 : {
424 8 : generate_option (OPT_Wl_, LD_STATIC_OPTION, 1, CL_DRIVER,
425 8 : &new_decoded_options[j]);
426 8 : j++;
427 : }
428 : #endif
429 21288 : if (which_library == USE_LIBCXX)
430 : {
431 0 : generate_option (OPT_l,
432 : saw_profile_flag ? LIBCXX_PROFILE : LIBCXX, 1,
433 0 : CL_DRIVER, &new_decoded_options[j]);
434 0 : if (LIBCXXABI != NULL)
435 : {
436 0 : j++;
437 0 : added_libraries++;
438 0 : generate_option (OPT_l,
439 : saw_profile_flag ? LIBCXXABI_PROFILE
440 : : LIBCXXABI, 1,
441 0 : CL_DRIVER, &new_decoded_options[j]);
442 : }
443 : }
444 : else
445 21288 : generate_option (OPT_l,
446 : saw_profile_flag ? LIBSTDCXX_PROFILE : LIBSTDCXX, 1,
447 21288 : CL_DRIVER, &new_decoded_options[j]);
448 21288 : added_libraries++;
449 21288 : j++;
450 : /* Add target-dependent static library, if necessary. */
451 21288 : if ((static_link || library > 1) && LIBSTDCXX_STATIC != NULL)
452 : {
453 : generate_option (OPT_l, LIBSTDCXX_STATIC, 1,
454 : CL_DRIVER, &new_decoded_options[j]);
455 : added_libraries++;
456 : j++;
457 : }
458 : #ifdef HAVE_LD_STATIC_DYNAMIC
459 21288 : if (library > 1 && !static_link)
460 : {
461 8 : generate_option (OPT_Wl_, LD_DYNAMIC_OPTION, 1, CL_DRIVER,
462 8 : &new_decoded_options[j]);
463 8 : j++;
464 : }
465 : #endif
466 : }
467 102879 : if (saw_math)
468 20868 : new_decoded_options[j++] = *saw_math;
469 82011 : else if (library > 0 && need_math)
470 : {
471 420 : generate_option (OPT_l,
472 : saw_profile_flag ? MATH_LIBRARY_PROFILE : MATH_LIBRARY,
473 420 : 1, CL_DRIVER, &new_decoded_options[j]);
474 420 : added_libraries++;
475 420 : j++;
476 : }
477 102879 : if (saw_time)
478 : new_decoded_options[j++] = *saw_time;
479 102879 : if (saw_libc)
480 0 : new_decoded_options[j++] = *saw_libc;
481 102879 : if (shared_libgcc && !static_link)
482 102851 : generate_option (OPT_shared_libgcc, NULL, 1, CL_DRIVER,
483 102851 : &new_decoded_options[j++]);
484 :
485 102879 : *in_decoded_options_count = j;
486 102879 : *in_decoded_options = new_decoded_options;
487 102879 : *in_added_libraries = added_libraries;
488 102879 : }
489 :
490 : /* Called before linking. Returns 0 on success and -1 on failure. */
491 79408 : int lang_specific_pre_link (void) /* Not used for C++. */
492 : {
493 79408 : return 0;
494 : }
495 :
496 : /* Number of extra output files that lang_specific_pre_link may generate. */
497 : int lang_specific_extra_outfiles = 0; /* Not used for C++. */
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