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3b426391 | 1 | /* Specific flags and argument handling of the C++ front end. |
a945c346 | 2 | Copyright (C) 1996-2024 Free Software Foundation, Inc. |
5b76d03b | 3 | |
f5adbb8d | 4 | This file is part of GCC. |
5b76d03b | 5 | |
f5adbb8d | 6 | GCC is free software; you can redistribute it and/or modify |
5b76d03b | 7 | it under the terms of the GNU General Public License as published by |
e77f031d | 8 | the Free Software Foundation; either version 3, or (at your option) |
5b76d03b BK |
9 | any later version. |
10 | ||
f5adbb8d | 11 | GCC is distributed in the hope that it will be useful, |
5b76d03b BK |
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 | |
e77f031d NC |
17 | along with GCC; see the file COPYING3. If not see |
18 | <http://www.gnu.org/licenses/>. */ | |
5b76d03b | 19 | |
da20811c | 20 | #include "config.h" |
8d052bc7 | 21 | #include "system.h" |
4977bab6 ZW |
22 | #include "coretypes.h" |
23 | #include "tm.h" | |
d9d16a19 | 24 | #include "opts.h" |
2ba25f50 | 25 | |
f442f723 MS |
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'. */ | |
55ebb0d6 | 31 | #define WITHLIBC (1<<3) |
96be7a11 | 32 | /* Skip this option. */ |
55ebb0d6 | 33 | #define SKIPOPT (1<<4) |
2efb237f JCI |
34 | /* Add -lstdc++exp for experimental features that need library support. */ |
35 | #define EXPERIMENTAL (1<<5) | |
f442f723 MS |
36 | |
37 | #ifndef MATH_LIBRARY | |
d9d16a19 | 38 | #define MATH_LIBRARY "m" |
f442f723 | 39 | #endif |
271f61fb | 40 | #ifndef MATH_LIBRARY_PROFILE |
61fec9ff | 41 | #define MATH_LIBRARY_PROFILE MATH_LIBRARY |
271f61fb | 42 | #endif |
f442f723 | 43 | |
18cd4ded | 44 | #ifndef LIBSTDCXX |
d9d16a19 | 45 | #define LIBSTDCXX "stdc++" |
18cd4ded | 46 | #endif |
271f61fb | 47 | #ifndef LIBSTDCXX_PROFILE |
4afd7f6c | 48 | #define LIBSTDCXX_PROFILE LIBSTDCXX |
271f61fb | 49 | #endif |
ce75e1dd | 50 | #ifndef LIBSTDCXX_STATIC |
a322799d | 51 | #define LIBSTDCXX_STATIC NULL |
ce75e1dd | 52 | #endif |
18cd4ded | 53 | |
662b9c55 IS |
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 | ||
f442f723 | 82 | void |
d9d16a19 JM |
83 | lang_specific_driver (struct cl_decoded_option **in_decoded_options, |
84 | unsigned int *in_decoded_options_count, | |
5671bf27 | 85 | int *in_added_libraries) |
f442f723 | 86 | { |
d9d16a19 | 87 | unsigned int i, j; |
f442f723 | 88 | |
838dfd8a | 89 | /* If nonzero, the user gave us the `-p' or `-pg' flag. */ |
271f61fb DB |
90 | int saw_profile_flag = 0; |
91 | ||
662b9c55 IS |
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. */ | |
17211ab5 | 97 | int library = 0; |
f442f723 | 98 | |
662b9c55 IS |
99 | /* Which c++ runtime library to link. */ |
100 | stdcxxlib_kind which_library = USE_LIBSTDCXX; | |
101 | ||
f442f723 MS |
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. */ | |
17211ab5 | 105 | int added = 0; |
f442f723 | 106 | |
f442f723 | 107 | /* The new argument list will be contained in this. */ |
d9d16a19 | 108 | struct cl_decoded_option *new_decoded_options; |
f442f723 | 109 | |
838dfd8a | 110 | /* Nonzero if we saw a `-xfoo' language specification on the |
f442f723 MS |
111 | command line. Used to avoid adding our own -xc++ if the user |
112 | already gave a language for the file. */ | |
113 | int saw_speclang = 0; | |
114 | ||
115 | /* "-lm" or "-lmath" if it appears on the command line. */ | |
d9d16a19 | 116 | const struct cl_decoded_option *saw_math = NULL; |
f442f723 | 117 | |
ff082cab RO |
118 | /* "-lrt" or eqivalent if it appears on the command line. */ |
119 | const struct cl_decoded_option *saw_time = NULL; | |
120 | ||
f442f723 | 121 | /* "-lc" if it appears on the command line. */ |
d9d16a19 | 122 | const struct cl_decoded_option *saw_libc = NULL; |
f442f723 MS |
123 | |
124 | /* An array used to flag each argument that needs a bit set for | |
55ebb0d6 | 125 | LANGSPEC, MATHLIB, or WITHLIBC. */ |
f442f723 MS |
126 | int *args; |
127 | ||
b54ccf71 JM |
128 | /* By default, we throw on the math library if we have one. */ |
129 | int need_math = (MATH_LIBRARY[0] != '\0'); | |
f442f723 | 130 | |
b20a3854 JM |
131 | /* By default, we don't add -lstdc++exp. */ |
132 | bool need_experimental = false; | |
133 | ||
96be7a11 ILT |
134 | /* True if we saw -static. */ |
135 | int static_link = 0; | |
136 | ||
049f6ec9 MM |
137 | /* True if we should add -shared-libgcc to the command-line. */ |
138 | int shared_libgcc = 1; | |
139 | ||
f442f723 | 140 | /* The total number of arguments with the new stuff. */ |
d9d16a19 | 141 | unsigned int argc; |
f442f723 MS |
142 | |
143 | /* The argument list. */ | |
d9d16a19 | 144 | struct cl_decoded_option *decoded_options; |
f442f723 | 145 | |
84914634 JW |
146 | /* The number of libraries added in. */ |
147 | int added_libraries; | |
148 | ||
f442f723 | 149 | /* The total number of arguments with the new stuff. */ |
d9d16a19 | 150 | unsigned int num_args = 1; |
f442f723 | 151 | |
d9d16a19 JM |
152 | argc = *in_decoded_options_count; |
153 | decoded_options = *in_decoded_options; | |
84914634 | 154 | added_libraries = *in_added_libraries; |
f442f723 | 155 | |
67f5655f | 156 | args = XCNEWVEC (int, argc); |
f442f723 | 157 | |
1bf2b2d2 | 158 | for (i = 1; i < argc; i++) |
f442f723 | 159 | { |
d9d16a19 JM |
160 | const char *arg = decoded_options[i].arg; |
161 | if (decoded_options[i].errors & CL_ERR_MISSING_ARG) | |
162 | continue; /* Avoid examining arguments of options missing them. */ | |
f442f723 | 163 | |
d9d16a19 | 164 | switch (decoded_options[i].opt_index) |
f442f723 | 165 | { |
2efb237f | 166 | case OPT_fcontracts: |
b20a3854 | 167 | need_experimental = true; |
2efb237f JCI |
168 | break; |
169 | ||
fc2fb4fd | 170 | case OPT_nostdlib__: |
6d3c634c JM |
171 | args[i] |= SKIPOPT; |
172 | /* FALLTHRU */ | |
173 | case OPT_nostdlib: | |
d9d16a19 JM |
174 | case OPT_nodefaultlibs: |
175 | library = -1; | |
176 | break; | |
177 | ||
178 | case OPT_l: | |
179 | if (strcmp (arg, MATH_LIBRARY) == 0) | |
f442f723 MS |
180 | { |
181 | args[i] |= MATHLIB; | |
182 | need_math = 0; | |
183 | } | |
d9d16a19 | 184 | else if (strcmp (arg, "c") == 0) |
f442f723 | 185 | args[i] |= WITHLIBC; |
d9d16a19 JM |
186 | else |
187 | /* Unrecognized libraries (e.g. -lfoo) may require libstdc++. */ | |
188 | library = (library == 0) ? 1 : library; | |
189 | break; | |
190 | ||
191 | case OPT_pg: | |
192 | case OPT_p: | |
193 | saw_profile_flag++; | |
194 | break; | |
195 | ||
196 | case OPT_x: | |
197 | if (library == 0 | |
198 | && (strcmp (arg, "c++") == 0 | |
199 | || strcmp (arg, "c++-cpp-output") == 0 | |
200 | || strcmp (arg, "objective-c++") == 0 | |
201 | || strcmp (arg, "objective-c++-cpp-output") == 0)) | |
202 | library = 1; | |
a073516d | 203 | |
d9d16a19 JM |
204 | saw_speclang = 1; |
205 | break; | |
206 | ||
207 | case OPT_Xlinker: | |
208 | case OPT_Wl_: | |
01e05466 GK |
209 | /* Arguments that go directly to the linker might be .o files, |
210 | or something, and so might cause libstdc++ to be needed. */ | |
d9d16a19 JM |
211 | if (library == 0) |
212 | library = 1; | |
213 | break; | |
214 | ||
215 | case OPT_c: | |
0b7fb27b | 216 | case OPT_r: |
d9d16a19 JM |
217 | case OPT_S: |
218 | case OPT_E: | |
219 | case OPT_M: | |
220 | case OPT_MM: | |
221 | case OPT_fsyntax_only: | |
222 | /* Don't specify libraries if we won't link, since that would | |
223 | cause a warning. */ | |
224 | library = -1; | |
225 | break; | |
226 | ||
227 | case OPT_static: | |
228 | static_link = 1; | |
229 | break; | |
230 | ||
231 | case OPT_static_libgcc: | |
232 | shared_libgcc = 0; | |
233 | break; | |
234 | ||
235 | case OPT_static_libstdc__: | |
236 | library = library >= 0 ? 2 : library; | |
a8468177 IS |
237 | #ifdef HAVE_LD_STATIC_DYNAMIC |
238 | /* Remove -static-libstdc++ from the command only if target supports | |
239 | LD_STATIC_DYNAMIC. When not supported, it is left in so that a | |
240 | back-end target can use outfile substitution. */ | |
d9d16a19 | 241 | args[i] |= SKIPOPT; |
a8468177 | 242 | #endif |
d9d16a19 JM |
243 | break; |
244 | ||
662b9c55 IS |
245 | case OPT_stdlib_: |
246 | which_library = (stdcxxlib_kind) decoded_options[i].value; | |
247 | break; | |
248 | ||
d9d16a19 JM |
249 | case OPT_SPECIAL_input_file: |
250 | { | |
251 | int len; | |
252 | ||
253 | /* We don't do this anymore, since we don't get them with minus | |
254 | signs on them. */ | |
255 | if (arg[0] == '\0' || arg[1] == '\0') | |
f442f723 | 256 | continue; |
f442f723 | 257 | |
d9d16a19 JM |
258 | if (saw_speclang) |
259 | { | |
260 | saw_speclang = 0; | |
261 | continue; | |
262 | } | |
263 | ||
264 | /* If the filename ends in .[chi], put options around it. | |
265 | But not if a specified -x option is currently active. */ | |
266 | len = strlen (arg); | |
267 | if (len > 2 | |
268 | && (arg[len - 1] == 'c' | |
269 | || arg[len - 1] == 'i' | |
270 | || arg[len - 1] == 'h') | |
271 | && arg[len - 2] == '.') | |
272 | { | |
273 | args[i] |= LANGSPEC; | |
274 | added += 2; | |
275 | } | |
276 | ||
277 | /* If we don't know that this is a header file, we might | |
278 | need to be linking in the libraries. */ | |
279 | if (library == 0) | |
280 | { | |
281 | if ((len <= 2 || strcmp (arg + (len - 2), ".H") != 0) | |
282 | && (len <= 2 || strcmp (arg + (len - 2), ".h") != 0) | |
283 | && (len <= 4 || strcmp (arg + (len - 4), ".hpp") != 0) | |
284 | && (len <= 3 || strcmp (arg + (len - 3), ".hp") != 0) | |
285 | && (len <= 4 || strcmp (arg + (len - 4), ".hxx") != 0) | |
286 | && (len <= 4 || strcmp (arg + (len - 4), ".h++") != 0) | |
287 | && (len <= 4 || strcmp (arg + (len - 4), ".HPP") != 0) | |
288 | && (len <= 4 || strcmp (arg + (len - 4), ".tcc") != 0) | |
289 | && (len <= 3 || strcmp (arg + (len - 3), ".hh") != 0)) | |
290 | library = 1; | |
291 | } | |
292 | } | |
293 | break; | |
f442f723 MS |
294 | } |
295 | } | |
296 | ||
049f6ec9 MM |
297 | /* There's no point adding -shared-libgcc if we don't have a shared |
298 | libgcc. */ | |
299 | #ifndef ENABLE_SHARED_LIBGCC | |
300 | shared_libgcc = 0; | |
301 | #endif | |
302 | ||
d9d16a19 | 303 | /* Add one for shared_libgcc or extra static library. */ |
b20a3854 JM |
304 | num_args = (argc + added + need_math + need_experimental |
305 | + (library > 0) * 4 + 1); | |
662b9c55 IS |
306 | /* For libc++, on most platforms, the ABI library (usually called libc++abi) |
307 | is provided as a separate DSO, which we must also append. | |
308 | However, a platform might have the ability to forward the ABI library | |
309 | from libc++, or combine it in some other way; in that case, LIBCXXABI | |
310 | should be set to NULL to signal that it need not be appended. */ | |
311 | if (which_library == USE_LIBCXX && LIBCXXABI != NULL) | |
312 | num_args += 4; | |
d9d16a19 | 313 | new_decoded_options = XNEWVEC (struct cl_decoded_option, num_args); |
f442f723 | 314 | |
834c6dff MM |
315 | i = 0; |
316 | j = 0; | |
c8094d83 | 317 | |
834c6dff | 318 | /* Copy the 0th argument, i.e., the name of the program itself. */ |
d9d16a19 | 319 | new_decoded_options[j++] = decoded_options[i++]; |
834c6dff | 320 | |
f442f723 | 321 | /* NOTE: We start at 1 now, not 0. */ |
834c6dff | 322 | while (i < argc) |
f442f723 | 323 | { |
d9d16a19 | 324 | new_decoded_options[j] = decoded_options[i]; |
f442f723 MS |
325 | |
326 | /* Make sure -lstdc++ is before the math library, since libstdc++ | |
327 | itself uses those math routines. */ | |
17211ab5 | 328 | if (!saw_math && (args[i] & MATHLIB) && library > 0) |
f442f723 MS |
329 | { |
330 | --j; | |
d9d16a19 | 331 | saw_math = &decoded_options[i]; |
f442f723 MS |
332 | } |
333 | ||
17211ab5 | 334 | if (!saw_libc && (args[i] & WITHLIBC) && library > 0) |
f442f723 MS |
335 | { |
336 | --j; | |
d9d16a19 | 337 | saw_libc = &decoded_options[i]; |
f442f723 MS |
338 | } |
339 | ||
17211ab5 | 340 | /* Wrap foo.[chi] files in a language specification to |
f442f723 MS |
341 | force the gcc compiler driver to run cc1plus on them. */ |
342 | if (args[i] & LANGSPEC) | |
343 | { | |
d9d16a19 JM |
344 | const char *arg = decoded_options[i].arg; |
345 | int len = strlen (arg); | |
346 | switch (arg[len - 1]) | |
17211ab5 GK |
347 | { |
348 | case 'c': | |
d9d16a19 JM |
349 | generate_option (OPT_x, "c++", 1, CL_DRIVER, |
350 | &new_decoded_options[j++]); | |
17211ab5 GK |
351 | break; |
352 | case 'i': | |
d9d16a19 JM |
353 | generate_option (OPT_x, "c++-cpp-output", 1, CL_DRIVER, |
354 | &new_decoded_options[j++]); | |
17211ab5 GK |
355 | break; |
356 | case 'h': | |
d9d16a19 JM |
357 | generate_option (OPT_x, "c++-header", 1, CL_DRIVER, |
358 | &new_decoded_options[j++]); | |
17211ab5 GK |
359 | break; |
360 | default: | |
8dc2b103 | 361 | gcc_unreachable (); |
17211ab5 | 362 | } |
d9d16a19 JM |
363 | new_decoded_options[j++] = decoded_options[i]; |
364 | generate_option (OPT_x, "none", 1, CL_DRIVER, | |
365 | &new_decoded_options[j]); | |
f442f723 | 366 | } |
f442f723 | 367 | |
96be7a11 ILT |
368 | if ((args[i] & SKIPOPT) != 0) |
369 | --j; | |
370 | ||
834c6dff MM |
371 | i++; |
372 | j++; | |
373 | } | |
eeb109f2 | 374 | |
f442f723 | 375 | /* Add `-lstdc++' if we haven't already done so. */ |
17211ab5 | 376 | if (library > 0) |
84914634 | 377 | { |
b20a3854 JM |
378 | if (need_experimental && which_library == USE_LIBSTDCXX) |
379 | { | |
380 | generate_option (OPT_l, "stdc++exp", 1, CL_DRIVER, | |
381 | &new_decoded_options[j++]); | |
382 | ++added_libraries; | |
383 | } | |
96be7a11 ILT |
384 | #ifdef HAVE_LD_STATIC_DYNAMIC |
385 | if (library > 1 && !static_link) | |
386 | { | |
c6092243 | 387 | generate_option (OPT_Wl_, LD_STATIC_OPTION, 1, CL_DRIVER, |
d9d16a19 | 388 | &new_decoded_options[j]); |
96be7a11 ILT |
389 | j++; |
390 | } | |
391 | #endif | |
662b9c55 IS |
392 | if (which_library == USE_LIBCXX) |
393 | { | |
394 | generate_option (OPT_l, | |
395 | saw_profile_flag ? LIBCXX_PROFILE : LIBCXX, 1, | |
396 | CL_DRIVER, &new_decoded_options[j]); | |
397 | if (LIBCXXABI != NULL) | |
398 | { | |
399 | j++; | |
400 | added_libraries++; | |
401 | generate_option (OPT_l, | |
402 | saw_profile_flag ? LIBCXXABI_PROFILE | |
403 | : LIBCXXABI, 1, | |
404 | CL_DRIVER, &new_decoded_options[j]); | |
405 | } | |
406 | } | |
407 | else | |
408 | generate_option (OPT_l, | |
409 | saw_profile_flag ? LIBSTDCXX_PROFILE : LIBSTDCXX, 1, | |
410 | CL_DRIVER, &new_decoded_options[j]); | |
d9d16a19 | 411 | added_libraries++; |
a322799d | 412 | j++; |
96be7a11 ILT |
413 | /* Add target-dependent static library, if necessary. */ |
414 | if ((static_link || library > 1) && LIBSTDCXX_STATIC != NULL) | |
415 | { | |
d9d16a19 JM |
416 | generate_option (OPT_l, LIBSTDCXX_STATIC, 1, |
417 | CL_DRIVER, &new_decoded_options[j]); | |
418 | added_libraries++; | |
96be7a11 ILT |
419 | j++; |
420 | } | |
421 | #ifdef HAVE_LD_STATIC_DYNAMIC | |
422 | if (library > 1 && !static_link) | |
423 | { | |
c6092243 | 424 | generate_option (OPT_Wl_, LD_DYNAMIC_OPTION, 1, CL_DRIVER, |
d9d16a19 | 425 | &new_decoded_options[j]); |
96be7a11 ILT |
426 | j++; |
427 | } | |
428 | #endif | |
84914634 | 429 | } |
f442f723 | 430 | if (saw_math) |
d9d16a19 | 431 | new_decoded_options[j++] = *saw_math; |
17211ab5 | 432 | else if (library > 0 && need_math) |
84914634 | 433 | { |
d9d16a19 JM |
434 | generate_option (OPT_l, |
435 | saw_profile_flag ? MATH_LIBRARY_PROFILE : MATH_LIBRARY, | |
436 | 1, CL_DRIVER, &new_decoded_options[j]); | |
437 | added_libraries++; | |
4afd7f6c | 438 | j++; |
84914634 | 439 | } |
ff082cab RO |
440 | if (saw_time) |
441 | new_decoded_options[j++] = *saw_time; | |
f442f723 | 442 | if (saw_libc) |
d9d16a19 | 443 | new_decoded_options[j++] = *saw_libc; |
96be7a11 | 444 | if (shared_libgcc && !static_link) |
d9d16a19 JM |
445 | generate_option (OPT_shared_libgcc, NULL, 1, CL_DRIVER, |
446 | &new_decoded_options[j++]); | |
f442f723 | 447 | |
d9d16a19 JM |
448 | *in_decoded_options_count = j; |
449 | *in_decoded_options = new_decoded_options; | |
84914634 | 450 | *in_added_libraries = added_libraries; |
f442f723 | 451 | } |
240661ba | 452 | |
c6002625 | 453 | /* Called before linking. Returns 0 on success and -1 on failure. */ |
bf9d3c27 | 454 | int lang_specific_pre_link (void) /* Not used for C++. */ |
240661ba PB |
455 | { |
456 | return 0; | |
457 | } | |
458 | ||
c6002625 KH |
459 | /* Number of extra output files that lang_specific_pre_link may generate. */ |
460 | int lang_specific_extra_outfiles = 0; /* Not used for C++. */ |