1 | /* Specific flags and argument handling of the C++ front end. |
2 | Copyright (C) 1996-2024 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 | lang_specific_driver (struct cl_decoded_option **in_decoded_options, |
84 | unsigned int *in_decoded_options_count, |
85 | int *in_added_libraries) |
86 | { |
87 | unsigned int i, j; |
88 | |
89 | /* If nonzero, the user gave us the `-p' or `-pg' flag. */ |
90 | 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 | int library = 0; |
98 | |
99 | /* Which c++ runtime library to link. */ |
100 | 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 | int added = 0; |
106 | |
107 | /* The new argument list will be contained in this. */ |
108 | 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 | int saw_speclang = 0; |
114 | |
115 | /* "-lm" or "-lmath" if it appears on the command line. */ |
116 | const struct cl_decoded_option *saw_math = NULL; |
117 | |
118 | /* "-lrt" or eqivalent if it appears on the command line. */ |
119 | const struct cl_decoded_option *saw_time = NULL; |
120 | |
121 | /* "-lc" if it appears on the command line. */ |
122 | 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 | int *args; |
127 | |
128 | /* By default, we throw on the math library if we have one. */ |
129 | int need_math = (MATH_LIBRARY[0] != '\0'); |
130 | |
131 | /* By default, we don't add -lstdc++exp. */ |
132 | bool need_experimental = false; |
133 | |
134 | /* True if we saw -static. */ |
135 | int static_link = 0; |
136 | |
137 | /* True if we should add -shared-libgcc to the command-line. */ |
138 | int shared_libgcc = 1; |
139 | |
140 | /* The total number of arguments with the new stuff. */ |
141 | unsigned int argc; |
142 | |
143 | /* The argument list. */ |
144 | struct cl_decoded_option *decoded_options; |
145 | |
146 | /* The number of libraries added in. */ |
147 | int added_libraries; |
148 | |
149 | /* The total number of arguments with the new stuff. */ |
150 | unsigned int num_args = 1; |
151 | |
152 | argc = *in_decoded_options_count; |
153 | decoded_options = *in_decoded_options; |
154 | added_libraries = *in_added_libraries; |
155 | |
156 | args = XCNEWVEC (int, argc); |
157 | |
158 | for (i = 1; i < argc; i++) |
159 | { |
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. */ |
163 | |
164 | switch (decoded_options[i].opt_index) |
165 | { |
166 | case OPT_fcontracts: |
167 | need_experimental = true; |
168 | break; |
169 | |
170 | case OPT_nostdlib__: |
171 | args[i] |= SKIPOPT; |
172 | /* FALLTHRU */ |
173 | case OPT_nostdlib: |
174 | case OPT_nodefaultlibs: |
175 | library = -1; |
176 | break; |
177 | |
178 | case OPT_l: |
179 | if (strcmp (s1: arg, MATH_LIBRARY) == 0) |
180 | { |
181 | args[i] |= MATHLIB; |
182 | need_math = 0; |
183 | } |
184 | else if (strcmp (s1: arg, s2: "c" ) == 0) |
185 | args[i] |= WITHLIBC; |
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 (s1: arg, s2: "c++" ) == 0 |
199 | || strcmp (s1: arg, s2: "c++-cpp-output" ) == 0 |
200 | || strcmp (s1: arg, s2: "objective-c++" ) == 0 |
201 | || strcmp (s1: arg, s2: "objective-c++-cpp-output" ) == 0)) |
202 | library = 1; |
203 | |
204 | saw_speclang = 1; |
205 | break; |
206 | |
207 | case OPT_Xlinker: |
208 | case OPT_Wl_: |
209 | /* Arguments that go directly to the linker might be .o files, |
210 | or something, and so might cause libstdc++ to be needed. */ |
211 | if (library == 0) |
212 | library = 1; |
213 | break; |
214 | |
215 | case OPT_c: |
216 | case OPT_r: |
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; |
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. */ |
241 | args[i] |= SKIPOPT; |
242 | #endif |
243 | break; |
244 | |
245 | case OPT_stdlib_: |
246 | which_library = (stdcxxlib_kind) decoded_options[i].value; |
247 | break; |
248 | |
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') |
256 | continue; |
257 | |
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 (s: 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 (s1: arg + (len - 2), s2: ".H" ) != 0) |
282 | && (len <= 2 || strcmp (s1: arg + (len - 2), s2: ".h" ) != 0) |
283 | && (len <= 4 || strcmp (s1: arg + (len - 4), s2: ".hpp" ) != 0) |
284 | && (len <= 3 || strcmp (s1: arg + (len - 3), s2: ".hp" ) != 0) |
285 | && (len <= 4 || strcmp (s1: arg + (len - 4), s2: ".hxx" ) != 0) |
286 | && (len <= 4 || strcmp (s1: arg + (len - 4), s2: ".h++" ) != 0) |
287 | && (len <= 4 || strcmp (s1: arg + (len - 4), s2: ".HPP" ) != 0) |
288 | && (len <= 4 || strcmp (s1: arg + (len - 4), s2: ".tcc" ) != 0) |
289 | && (len <= 3 || strcmp (s1: arg + (len - 3), s2: ".hh" ) != 0)) |
290 | library = 1; |
291 | } |
292 | } |
293 | break; |
294 | } |
295 | } |
296 | |
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 | |
303 | /* Add one for shared_libgcc or extra static library. */ |
304 | num_args = (argc + added + need_math + need_experimental |
305 | + (library > 0) * 4 + 1); |
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; |
313 | new_decoded_options = XNEWVEC (struct cl_decoded_option, num_args); |
314 | |
315 | i = 0; |
316 | j = 0; |
317 | |
318 | /* Copy the 0th argument, i.e., the name of the program itself. */ |
319 | new_decoded_options[j++] = decoded_options[i++]; |
320 | |
321 | /* NOTE: We start at 1 now, not 0. */ |
322 | while (i < argc) |
323 | { |
324 | new_decoded_options[j] = decoded_options[i]; |
325 | |
326 | /* Make sure -lstdc++ is before the math library, since libstdc++ |
327 | itself uses those math routines. */ |
328 | if (!saw_math && (args[i] & MATHLIB) && library > 0) |
329 | { |
330 | --j; |
331 | saw_math = &decoded_options[i]; |
332 | } |
333 | |
334 | if (!saw_libc && (args[i] & WITHLIBC) && library > 0) |
335 | { |
336 | --j; |
337 | saw_libc = &decoded_options[i]; |
338 | } |
339 | |
340 | /* Wrap foo.[chi] files in a language specification to |
341 | force the gcc compiler driver to run cc1plus on them. */ |
342 | if (args[i] & LANGSPEC) |
343 | { |
344 | const char *arg = decoded_options[i].arg; |
345 | int len = strlen (s: arg); |
346 | switch (arg[len - 1]) |
347 | { |
348 | case 'c': |
349 | generate_option (opt_index: OPT_x, arg: "c++" , value: 1, CL_DRIVER, |
350 | decoded: &new_decoded_options[j++]); |
351 | break; |
352 | case 'i': |
353 | generate_option (opt_index: OPT_x, arg: "c++-cpp-output" , value: 1, CL_DRIVER, |
354 | decoded: &new_decoded_options[j++]); |
355 | break; |
356 | case 'h': |
357 | generate_option (opt_index: OPT_x, arg: "c++-header" , value: 1, CL_DRIVER, |
358 | decoded: &new_decoded_options[j++]); |
359 | break; |
360 | default: |
361 | gcc_unreachable (); |
362 | } |
363 | new_decoded_options[j++] = decoded_options[i]; |
364 | generate_option (opt_index: OPT_x, arg: "none" , value: 1, CL_DRIVER, |
365 | decoded: &new_decoded_options[j]); |
366 | } |
367 | |
368 | if ((args[i] & SKIPOPT) != 0) |
369 | --j; |
370 | |
371 | i++; |
372 | j++; |
373 | } |
374 | |
375 | /* Add `-lstdc++' if we haven't already done so. */ |
376 | if (library > 0) |
377 | { |
378 | if (need_experimental && which_library == USE_LIBSTDCXX) |
379 | { |
380 | generate_option (opt_index: OPT_l, arg: "stdc++exp" , value: 1, CL_DRIVER, |
381 | decoded: &new_decoded_options[j++]); |
382 | ++added_libraries; |
383 | } |
384 | #ifdef HAVE_LD_STATIC_DYNAMIC |
385 | if (library > 1 && !static_link) |
386 | { |
387 | generate_option (opt_index: OPT_Wl_, LD_STATIC_OPTION, value: 1, CL_DRIVER, |
388 | decoded: &new_decoded_options[j]); |
389 | j++; |
390 | } |
391 | #endif |
392 | if (which_library == USE_LIBCXX) |
393 | { |
394 | generate_option (opt_index: OPT_l, |
395 | arg: saw_profile_flag ? LIBCXX_PROFILE : LIBCXX, value: 1, |
396 | CL_DRIVER, decoded: &new_decoded_options[j]); |
397 | if (LIBCXXABI != NULL) |
398 | { |
399 | j++; |
400 | added_libraries++; |
401 | generate_option (opt_index: OPT_l, |
402 | arg: saw_profile_flag ? LIBCXXABI_PROFILE |
403 | : LIBCXXABI, value: 1, |
404 | CL_DRIVER, decoded: &new_decoded_options[j]); |
405 | } |
406 | } |
407 | else |
408 | generate_option (opt_index: OPT_l, |
409 | arg: saw_profile_flag ? LIBSTDCXX_PROFILE : LIBSTDCXX, value: 1, |
410 | CL_DRIVER, decoded: &new_decoded_options[j]); |
411 | added_libraries++; |
412 | j++; |
413 | /* Add target-dependent static library, if necessary. */ |
414 | if ((static_link || library > 1) && LIBSTDCXX_STATIC != NULL) |
415 | { |
416 | generate_option (opt_index: OPT_l, LIBSTDCXX_STATIC, value: 1, |
417 | CL_DRIVER, decoded: &new_decoded_options[j]); |
418 | added_libraries++; |
419 | j++; |
420 | } |
421 | #ifdef HAVE_LD_STATIC_DYNAMIC |
422 | if (library > 1 && !static_link) |
423 | { |
424 | generate_option (opt_index: OPT_Wl_, LD_DYNAMIC_OPTION, value: 1, CL_DRIVER, |
425 | decoded: &new_decoded_options[j]); |
426 | j++; |
427 | } |
428 | #endif |
429 | } |
430 | if (saw_math) |
431 | new_decoded_options[j++] = *saw_math; |
432 | else if (library > 0 && need_math) |
433 | { |
434 | generate_option (opt_index: OPT_l, |
435 | arg: saw_profile_flag ? MATH_LIBRARY_PROFILE : MATH_LIBRARY, |
436 | value: 1, CL_DRIVER, decoded: &new_decoded_options[j]); |
437 | added_libraries++; |
438 | j++; |
439 | } |
440 | if (saw_time) |
441 | new_decoded_options[j++] = *saw_time; |
442 | if (saw_libc) |
443 | new_decoded_options[j++] = *saw_libc; |
444 | if (shared_libgcc && !static_link) |
445 | generate_option (opt_index: OPT_shared_libgcc, NULL, value: 1, CL_DRIVER, |
446 | decoded: &new_decoded_options[j++]); |
447 | |
448 | *in_decoded_options_count = j; |
449 | *in_decoded_options = new_decoded_options; |
450 | *in_added_libraries = added_libraries; |
451 | } |
452 | |
453 | /* Called before linking. Returns 0 on success and -1 on failure. */ |
454 | int lang_specific_pre_link (void) /* Not used for C++. */ |
455 | { |
456 | return 0; |
457 | } |
458 | |
459 | /* Number of extra output files that lang_specific_pre_link may generate. */ |
460 | int = 0; /* Not used for C++. */ |
461 | |