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cselib.c (cselib_current_insn_in_libcall): New static variable.
[official-gcc.git] / gcc / c-opts.c
blob85ed5f325aa4965bdde4b4b9e8bbbcfbc1a49743
1 /* C/ObjC/C++ command line option handling.
2 Copyright (C) 2002 Free Software Foundation, Inc.
3 Contributed by Neil Booth.
4
5 This file is part of GCC.
6
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
10 version.
11
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
15 for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to the Free
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
20 02111-1307, USA. */
21
22 #include "config.h"
23 #include "system.h"
24 #include "coretypes.h"
25 #include "tm.h"
26 #include "tree.h"
27 #include "c-common.h"
28 #include "c-pragma.h"
29 #include "flags.h"
30 #include "toplev.h"
31 #include "langhooks.h"
32 #include "tree-inline.h"
33 #include "diagnostic.h"
34 #include "intl.h"
35
36 /* CPP's options. */
37 static cpp_options *cpp_opts;
38
39 /* Input filename. */
40 static const char *in_fname;
41
42 /* Filename and stream for preprocessed output. */
43 static const char *out_fname;
44 static FILE *out_stream;
45
46 /* Append dependencies to deps_file. */
47 static bool deps_append;
48
49 /* If dependency switches (-MF etc.) have been given. */
50 static bool deps_seen;
51
52 /* Dependency output file. */
53 static const char *deps_file;
54
55 /* Number of deferred options, deferred options array size. */
56 static size_t deferred_count, deferred_size;
57
58 static void missing_arg PARAMS ((size_t));
59 static size_t find_opt PARAMS ((const char *, int));
60 static void set_Wimplicit PARAMS ((int));
61 static void complain_wrong_lang PARAMS ((size_t));
62 static void write_langs PARAMS ((char *, int));
63 static void print_help PARAMS ((void));
64 static void handle_OPT_d PARAMS ((const char *));
65 static void set_std_cxx98 PARAMS ((int));
66 static void set_std_c89 PARAMS ((int, int));
67 static void set_std_c99 PARAMS ((int));
68 static void check_deps_environment_vars PARAMS ((void));
69 static void preprocess_file PARAMS ((void));
70 static void handle_deferred_opts PARAMS ((void));
71 static void sanitize_cpp_opts PARAMS ((void));
72
73 #ifndef STDC_0_IN_SYSTEM_HEADERS
74 #define STDC_0_IN_SYSTEM_HEADERS 0
75 #endif
76
77 #define CL_C_ONLY (1 << 0) /* Only C. */
78 #define CL_OBJC_ONLY (1 << 1) /* Only ObjC. */
79 #define CL_CXX_ONLY (1 << 2) /* Only C++. */
80 #define CL_OBJCXX_ONLY (1 << 3) /* Only ObjC++. */
81 #define CL_JOINED (1 << 4) /* If takes joined argument. */
82 #define CL_SEPARATE (1 << 5) /* If takes a separate argument. */
83
84 #define CL_ARG (CL_JOINED | CL_SEPARATE)
85 #define CL_C (CL_C_ONLY | CL_OBJC_ONLY)
86 #define CL_OBJC (CL_OBJC_ONLY | CL_OBJCXX_ONLY)
87 #define CL_CXX (CL_CXX_ONLY | CL_OBJCXX_ONLY)
88 #define CL_ALL (CL_C | CL_CXX)
89
90 /* This is the list of all command line options, with the leading "-"
91 removed. It must be sorted in ASCII collating order. All options
92 beginning with "f" or "W" are implicitly assumed to take a "no-"
93 form; this form should not be listed. The variable "on" is true if
94 the positive form is given, otherwise it is false. If you don't
95 want to allow a "no-" form, your handler should reject "on" being
96 false by returning zero. See, for example, the handling of
97 -ftabstop=.
98
99 If the user gives an option to a front end that doesn't support it,
100 an error is output, mentioning which front ends the option is valid
101 for. If you don't want this, you must accept it for all front
102 ends, and test for the front end in the option handler. See, for
103 example, the handling of -Wno-strict-prototypes for C++.
104
105 If you request an argument with CL_JOINED, CL_SEPARATE or their
106 combination CL_ARG, it is stored in the variable "arg", which is
107 guaranteed to be non-NULL and to not be an empty string. It points
108 to the argument either within the argv[] vector or within one of
109 that vector's strings, and so the text is permanent and copies need
110 not be made. Be sure to add an error message in missing_arg() if
111 the default is not appropriate. */
112
113 #define COMMAND_LINE_OPTIONS \
114 OPT("-help", CL_ALL, OPT__help) \
115 OPT("C", CL_ALL, OPT_C) \
116 OPT("CC", CL_ALL, OPT_CC) \
117 OPT("E", CL_ALL, OPT_E) \
118 OPT("H", CL_ALL, OPT_H) \
119 OPT("M", CL_ALL, OPT_M) \
120 OPT("MD", CL_ALL | CL_SEPARATE, OPT_MD) \
121 OPT("MF", CL_ALL | CL_ARG, OPT_MF) \
122 OPT("MG", CL_ALL, OPT_MG) \
123 OPT("MM", CL_ALL, OPT_MM) \
124 OPT("MMD", CL_ALL | CL_SEPARATE, OPT_MMD) \
125 OPT("MP", CL_ALL, OPT_MP) \
126 OPT("MQ", CL_ALL | CL_ARG, OPT_MQ) \
127 OPT("MT", CL_ALL | CL_ARG, OPT_MT) \
128 OPT("P", CL_ALL, OPT_P) \
129 OPT("Wabi", CL_CXX, OPT_Wabi) \
130 OPT("Wall", CL_ALL, OPT_Wall) \
131 OPT("Wbad-function-cast", CL_C, OPT_Wbad_function_cast) \
132 OPT("Wcast-qual", CL_ALL, OPT_Wcast_qual) \
133 OPT("Wchar-subscripts", CL_ALL, OPT_Wchar_subscripts) \
134 OPT("Wcomment", CL_ALL, OPT_Wcomment) \
135 OPT("Wcomments", CL_ALL, OPT_Wcomments) \
136 OPT("Wconversion", CL_ALL, OPT_Wconversion) \
137 OPT("Wctor-dtor-privacy", CL_CXX, OPT_Wctor_dtor_privacy) \
138 OPT("Wdeprecated", CL_CXX, OPT_Wdeprecated) \
139 OPT("Wdiv-by-zero", CL_C, OPT_Wdiv_by_zero) \
140 OPT("Weffc++", CL_CXX, OPT_Weffcxx) \
141 OPT("Wendif-labels", CL_ALL, OPT_Wendif_labels) \
142 OPT("Werror", CL_ALL, OPT_Werror) \
143 OPT("Werror-implicit-function-declaration", \
144 CL_C, OPT_Werror_implicit_function_decl) \
145 OPT("Wfloat-equal", CL_ALL, OPT_Wfloat_equal) \
146 OPT("Wformat", CL_ALL, OPT_Wformat) \
147 OPT("Wformat-extra-args", CL_ALL, OPT_Wformat_extra_args) \
148 OPT("Wformat-nonliteral", CL_ALL, OPT_Wformat_nonliteral) \
149 OPT("Wformat-security", CL_ALL, OPT_Wformat_security) \
150 OPT("Wformat-y2k", CL_ALL, OPT_Wformat_y2k) \
151 OPT("Wformat-zero-length", CL_C, OPT_Wformat_zero_length) \
152 OPT("Wformat=", CL_ALL | CL_JOINED, OPT_Wformat_eq) \
153 OPT("Wimplicit", CL_ALL, OPT_Wimplicit) \
154 OPT("Wimplicit-function-declaration", CL_C, OPT_Wimplicit_function_decl) \
155 OPT("Wimplicit-int", CL_C, OPT_Wimplicit_int) \
156 OPT("Wimport", CL_ALL, OPT_Wimport) \
157 OPT("Wlong-long", CL_ALL, OPT_Wlong_long) \
158 OPT("Wmain", CL_C, OPT_Wmain) \
159 OPT("Wmissing-braces", CL_ALL, OPT_Wmissing_braces) \
160 OPT("Wmissing-declarations", CL_C, OPT_Wmissing_declarations) \
161 OPT("Wmissing-format-attribute",CL_ALL, OPT_Wmissing_format_attribute) \
162 OPT("Wmissing-prototypes", CL_ALL, OPT_Wmissing_prototypes) \
163 OPT("Wmultichar", CL_ALL, OPT_Wmultichar) \
164 OPT("Wnested-externs", CL_C, OPT_Wnested_externs) \
165 OPT("Wnon-template-friend", CL_CXX, OPT_Wnon_template_friend) \
166 OPT("Wnon-virtual-dtor", CL_CXX, OPT_Wnon_virtual_dtor) \
167 OPT("Wnonnull", CL_C, OPT_Wnonnull) \
168 OPT("Wold-style-cast", CL_CXX, OPT_Wold_style_cast) \
169 OPT("Woverloaded-virtual", CL_CXX, OPT_Woverloaded_virtual) \
170 OPT("Wparentheses", CL_ALL, OPT_Wparentheses) \
171 OPT("Wpmf-conversions", CL_CXX, OPT_Wpmf_conversions) \
172 OPT("Wpointer-arith", CL_ALL, OPT_Wpointer_arith) \
173 OPT("Wprotocol", CL_OBJC, OPT_Wprotocol) \
174 OPT("Wredundant-decls", CL_ALL, OPT_Wredundant_decls) \
175 OPT("Wreorder", CL_CXX, OPT_Wreorder) \
176 OPT("Wreturn-type", CL_ALL, OPT_Wreturn_type) \
177 OPT("Wselector", CL_OBJC, OPT_Wselector) \
178 OPT("Wsequence-point", CL_C, OPT_Wsequence_point) \
179 OPT("Wsign-compare", CL_ALL, OPT_Wsign_compare) \
180 OPT("Wsign-promo", CL_CXX, OPT_Wsign_promo) \
181 OPT("Wstrict-prototypes", CL_ALL, OPT_Wstrict_prototypes) \
182 OPT("Wsynth", CL_CXX, OPT_Wsynth) \
183 OPT("Wsystem-headers", CL_ALL, OPT_Wsystem_headers) \
184 OPT("Wtraditional", CL_C, OPT_Wtraditional) \
185 OPT("Wtrigraphs", CL_ALL, OPT_Wtrigraphs) \
186 OPT("Wundeclared-selector", CL_OBJC, OPT_Wundeclared_selector) \
187 OPT("Wundef", CL_ALL, OPT_Wundef) \
188 OPT("Wunknown-pragmas", CL_ALL, OPT_Wunknown_pragmas) \
189 OPT("Wunused-macros", CL_ALL, OPT_Wunused_macros) \
190 OPT("Wwrite-strings", CL_ALL, OPT_Wwrite_strings) \
191 OPT("ansi", CL_ALL, OPT_ansi) \
192 OPT("d", CL_ALL | CL_JOINED, OPT_d) \
193 OPT("fabi-version=", CL_CXX | CL_JOINED, OPT_fabi_version) \
194 OPT("faccess-control", CL_CXX, OPT_faccess_control) \
195 OPT("fall-virtual", CL_CXX, OPT_fall_virtual) \
196 OPT("falt-external-templates",CL_CXX, OPT_falt_external_templates) \
197 OPT("fasm", CL_ALL, OPT_fasm) \
198 OPT("fbuiltin", CL_ALL, OPT_fbuiltin) \
199 OPT("fbuiltin-", CL_ALL | CL_JOINED, OPT_fbuiltin_) \
200 OPT("fcheck-new", CL_CXX, OPT_fcheck_new) \
201 OPT("fcond-mismatch", CL_ALL, OPT_fcond_mismatch) \
202 OPT("fconserve-space", CL_CXX, OPT_fconserve_space) \
203 OPT("fconst-strings", CL_CXX, OPT_fconst_strings) \
204 OPT("fconstant-string-class=", CL_OBJC | CL_JOINED, \
205 OPT_fconstant_string_class) \
206 OPT("fdefault-inline", CL_CXX, OPT_fdefault_inline) \
207 OPT("fdollars-in-identifiers",CL_ALL, OPT_fdollars_in_identifiers) \
208 OPT("fdump-", CL_ALL | CL_JOINED, OPT_fdump) \
209 OPT("felide-constructors", CL_CXX, OPT_felide_constructors) \
210 OPT("fenforce-eh-specs", CL_CXX, OPT_fenforce_eh_specs) \
211 OPT("fenum-int-equiv", CL_CXX, OPT_fenum_int_equiv) \
212 OPT("fexternal-templates", CL_CXX, OPT_fexternal_templates) \
213 OPT("ffor-scope", CL_CXX, OPT_ffor_scope) \
214 OPT("ffreestanding", CL_C, OPT_ffreestanding) \
215 OPT("fgnu-keywords", CL_CXX, OPT_fgnu_keywords) \
216 OPT("fgnu-runtime", CL_OBJC, OPT_fgnu_runtime) \
217 OPT("fguiding-decls", CL_CXX, OPT_fguiding_decls) \
218 OPT("fhandle-exceptions", CL_CXX, OPT_fhandle_exceptions) \
219 OPT("fhonor-std", CL_CXX, OPT_fhonor_std) \
220 OPT("fhosted", CL_C, OPT_fhosted) \
221 OPT("fhuge-objects", CL_CXX, OPT_fhuge_objects) \
222 OPT("fimplement-inlines", CL_CXX, OPT_fimplement_inlines) \
223 OPT("fimplicit-inline-templates", CL_CXX, OPT_fimplicit_inline_templates) \
224 OPT("fimplicit-templates", CL_CXX, OPT_fimplicit_templates) \
225 OPT("flabels-ok", CL_CXX, OPT_flabels_ok) \
226 OPT("fms-extensions", CL_ALL, OPT_fms_extensions) \
227 OPT("fname-mangling-version-",CL_CXX | CL_JOINED, OPT_fname_mangling) \
228 OPT("fnew-abi", CL_CXX, OPT_fnew_abi) \
229 OPT("fnext-runtime", CL_OBJC, OPT_fnext_runtime) \
230 OPT("fnonansi-builtins", CL_CXX, OPT_fnonansi_builtins) \
231 OPT("fnonnull-objects", CL_CXX, OPT_fnonnull_objects) \
232 OPT("foperator-names", CL_CXX, OPT_foperator_names) \
233 OPT("foptional-diags", CL_CXX, OPT_foptional_diags) \
234 OPT("fpermissive", CL_CXX, OPT_fpermissive) \
235 OPT("fpreprocessed", CL_ALL, OPT_fpreprocessed) \
236 OPT("frepo", CL_CXX, OPT_frepo) \
237 OPT("frtti", CL_CXX, OPT_frtti) \
238 OPT("fshort-double", CL_ALL, OPT_fshort_double) \
239 OPT("fshort-enums", CL_ALL, OPT_fshort_enums) \
240 OPT("fshort-wchar", CL_ALL, OPT_fshort_wchar) \
241 OPT("fshow-column", CL_ALL, OPT_fshow_column) \
242 OPT("fsigned-bitfields", CL_ALL, OPT_fsigned_bitfields) \
243 OPT("fsigned-char", CL_ALL, OPT_fsigned_char) \
244 OPT("fsquangle", CL_CXX, OPT_fsquangle) \
245 OPT("fstats", CL_CXX, OPT_fstats) \
246 OPT("fstrict-prototype", CL_CXX, OPT_fstrict_prototype) \
247 OPT("ftabstop=", CL_ALL | CL_JOINED, OPT_ftabstop) \
248 OPT("ftemplate-depth-", CL_CXX | CL_JOINED, OPT_ftemplate_depth) \
249 OPT("fthis-is-variable", CL_CXX, OPT_fthis_is_variable) \
250 OPT("funsigned-bitfields", CL_ALL, OPT_funsigned_bitfields) \
251 OPT("funsigned-char", CL_ALL, OPT_funsigned_char) \
252 OPT("fuse-cxa-atexit", CL_CXX, OPT_fuse_cxa_atexit) \
253 OPT("fvtable-gc", CL_CXX, OPT_fvtable_gc) \
254 OPT("fvtable-thunks", CL_CXX, OPT_fvtable_thunks) \
255 OPT("fweak", CL_CXX, OPT_fweak) \
256 OPT("fxref", CL_CXX, OPT_fxref) \
257 OPT("gen-decls", CL_OBJC, OPT_gen_decls) \
258 OPT("lang-asm", CL_C_ONLY, OPT_lang_asm) \
259 OPT("lang-objc", CL_ALL, OPT_lang_objc) \
260 OPT("nostdinc", CL_ALL, OPT_nostdinc) \
261 OPT("nostdinc++", CL_ALL, OPT_nostdincplusplus) \
262 OPT("o", CL_ALL | CL_ARG, OPT_o) \
263 OPT("pedantic", CL_ALL, OPT_pedantic) \
264 OPT("pedantic-errors", CL_ALL, OPT_pedantic_errors) \
265 OPT("print-objc-runtime-info", CL_OBJC, OPT_print_objc_runtime_info) \
266 OPT("remap", CL_ALL, OPT_remap) \
267 OPT("std=c++98", CL_CXX, OPT_std_cplusplus98) \
268 OPT("std=c89", CL_C, OPT_std_c89) \
269 OPT("std=c99", CL_C, OPT_std_c99) \
270 OPT("std=c9x", CL_C, OPT_std_c9x) \
271 OPT("std=gnu++98", CL_CXX, OPT_std_gnuplusplus98) \
272 OPT("std=gnu89", CL_C, OPT_std_gnu89) \
273 OPT("std=gnu99", CL_C, OPT_std_gnu99) \
274 OPT("std=gnu9x", CL_C, OPT_std_gnu9x) \
275 OPT("std=iso9899:1990", CL_C, OPT_std_iso9899_1990) \
276 OPT("std=iso9899:199409", CL_C, OPT_std_iso9899_199409) \
277 OPT("std=iso9899:1999", CL_C, OPT_std_iso9899_1999) \
278 OPT("std=iso9899:199x", CL_C, OPT_std_iso9899_199x) \
279 OPT("traditional-cpp", CL_ALL, OPT_traditional_cpp) \
280 OPT("trigraphs", CL_ALL, OPT_trigraphs) \
281 OPT("undef", CL_ALL, OPT_undef) \
282 OPT("v", CL_ALL, OPT_v) \
283 OPT("w", CL_ALL, OPT_w)
284
285 #define OPT(text, flags, code) code,
286 enum opt_code
287 {
288 COMMAND_LINE_OPTIONS
289 N_OPTS
290 };
291 #undef OPT
292
293 struct cl_option
294 {
295 const char *opt_text;
296 unsigned char opt_len;
297 unsigned char flags;
298 ENUM_BITFIELD (opt_code) opt_code : 2 * CHAR_BIT;
299 };
300
301 #define OPT(text, flags, code) { text, sizeof(text) - 1, flags, code },
302 #ifdef HOST_EBCDIC
303 static struct cl_option cl_options[] =
304 #else
305 static const struct cl_option cl_options[] =
306 #endif
307 {
308 COMMAND_LINE_OPTIONS
309 };
310 #undef OPT
311 #undef COMMAND_LINE_OPTIONS
312
313 /* Holds switches parsed by c_common_decode_option (), but whose
314 handling is deffered to c_common_post_options (). */
315 static void defer_opt PARAMS ((enum opt_code, const char *));
316 static struct deferred_opt
317 {
318 enum opt_code code;
319 const char *arg;
320 } *deferred_opts;
321
322
323 #ifdef HOST_EBCDIC
324 static int opt_comp PARAMS ((const void *, const void *));
325
326 /* Run-time sorting of options array. */
327 static int
328 opt_comp (p1, p2)
329 const void *p1, *p2;
330 {
331 return strcmp (((struct cl_option *) p1)->opt_text,
332 ((struct cl_option *) p2)->opt_text);
333 }
334 #endif
335
336 /* Complain that switch OPT_INDEX expects an argument but none was
337 provided. */
338 static void
339 missing_arg (opt_index)
340 size_t opt_index;
341 {
342 const char *opt_text = cl_options[opt_index].opt_text;
343
344 switch (cl_options[opt_index].opt_code)
345 {
346 case OPT_Wformat_eq:
347 case OPT_d:
348 case OPT_fabi_version:
349 case OPT_fbuiltin_:
350 case OPT_fdump:
351 case OPT_fname_mangling:
352 case OPT_ftabstop:
353 case OPT_ftemplate_depth:
354 default:
355 error ("missing argument to \"-%s\"", opt_text);
356 break;
357
358 case OPT_fconstant_string_class:
359 error ("no class name specified with \"-%s\"", opt_text);
360 break;
361
362 case OPT_MF:
363 case OPT_MD:
364 case OPT_MMD:
365 case OPT_o:
366 error ("missing filename after \"-%s\"", opt_text);
367 break;
368
369 case OPT_MQ:
370 case OPT_MT:
371 error ("missing target after \"-%s\"", opt_text);
372 break;
373 }
374 }
375
376 /* Perform a binary search to find which option the command-line INPUT
377 matches. Returns its index in the option array, and N_OPTS on
378 failure.
379
380 Complications arise since some options can be suffixed with an
381 argument, and multiple complete matches can occur, e.g. -pedantic
382 and -pedantic-errors. Also, some options are only accepted by some
383 languages. If a switch matches for a different language and
384 doesn't match any alternatives for the true front end, the index of
385 the matched switch is returned anyway. The caller should check for
386 this case. */
387 static size_t
388 find_opt (input, lang_flag)
389 const char *input;
390 int lang_flag;
391 {
392 size_t md, mn, mx;
393 size_t opt_len;
394 size_t result = N_OPTS;
395 int comp;
396
397 mn = 0;
398 mx = N_OPTS;
399
400 while (mx > mn)
401 {
402 md = (mn + mx) / 2;
403
404 opt_len = cl_options[md].opt_len;
405 comp = strncmp (input, cl_options[md].opt_text, opt_len);
406
407 if (comp < 0)
408 mx = md;
409 else if (comp > 0)
410 mn = md + 1;
411 else
412 {
413 /* The switch matches. It it an exact match? */
414 if (input[opt_len] == '\0')
415 return md;
416 else
417 {
418 mn = md + 1;
419
420 /* If the switch takes no arguments this is not a proper
421 match, so we continue the search (e.g. input="stdc++"
422 match was "stdc"). */
423 if (!(cl_options[md].flags & CL_JOINED))
424 continue;
425
426 /* Is this switch valid for this front end? */
427 if (!(cl_options[md].flags & lang_flag))
428 {
429 /* If subsequently we don't find a better match,
430 return this and let the caller report it as a bad
431 match. */
432 result = md;
433 continue;
434 }
435
436 /* Two scenarios remain: we have the switch's argument,
437 or we match a longer option. This can happen with
438 -iwithprefix and -withprefixbefore. The longest
439 possible option match succeeds.
440
441 Scan forwards, and return an exact match. Otherwise
442 return the longest valid option-accepting match (mx).
443 This loops at most twice with current options. */
444 mx = md;
445 for (md = md + 1; md < (size_t) N_OPTS; md++)
446 {
447 opt_len = cl_options[md].opt_len;
448 if (strncmp (input, cl_options[md].opt_text, opt_len))
449 break;
450 if (input[opt_len] == '\0')
451 return md;
452 if (cl_options[md].flags & lang_flag
453 && cl_options[md].flags & CL_JOINED)
454 mx = md;
455 }
456
457 return mx;
458 }
459 }
460 }
461
462 return result;
463 }
464
465 /* Defer option CODE with argument ARG. */
466 static void
467 defer_opt (code, arg)
468 enum opt_code code;
469 const char *arg;
470 {
471 /* FIXME: this should be in c_common_init_options, which should take
472 argc and argv. */
473 if (!deferred_opts)
474 {
475 extern int save_argc;
476 deferred_size = save_argc;
477 deferred_opts = (struct deferred_opt *)
478 xmalloc (deferred_size * sizeof (struct deferred_opt));
479 }
480
481 if (deferred_count == deferred_size)
482 abort ();
483
484 deferred_opts[deferred_count].code = code;
485 deferred_opts[deferred_count].arg = arg;
486 deferred_count++;
487 }
488
489 /* Common initialization before parsing options. */
490 void
491 c_common_init_options (lang)
492 enum c_language_kind lang;
493 {
494 #ifdef HOST_EBCDIC
495 /* For non-ASCII hosts, the cl_options array needs to be sorted at
496 runtime. */
497 qsort (cl_options, N_OPTS, sizeof (struct cl_option), opt_comp);
498 #endif
499 #if ENABLE_CHECKING
500 {
501 size_t i;
502
503 for (i = 1; i < N_OPTS; i++)
504 if (strcmp (cl_options[i - 1].opt_text, cl_options[i].opt_text) >= 0)
505 error ("options array incorrectly sorted: %s is before %s",
506 cl_options[i - 1].opt_text, cl_options[i].opt_text);
507 }
508 #endif
509
510 c_language = lang;
511 parse_in = cpp_create_reader (lang == clk_c ? CLK_GNUC89 : CLK_GNUCXX);
512 cpp_opts = cpp_get_options (parse_in);
513 if (flag_objc)
514 cpp_opts->objc = 1;
515
516 flag_const_strings = (lang == clk_cplusplus);
517 warn_pointer_arith = (lang == clk_cplusplus);
518 if (lang == clk_c)
519 warn_sign_compare = -1;
520 }
521
522 /* Handle one command-line option in (argc, argv).
523 Can be called multiple times, to handle multiple sets of options.
524 Returns number of strings consumed. */
525 int
526 c_common_decode_option (argc, argv)
527 int argc;
528 char **argv;
529 {
530 static const int lang_flags[] = {CL_C_ONLY, CL_C, CL_CXX_ONLY, CL_CXX};
531 size_t opt_index;
532 const char *opt, *arg = 0;
533 char *dup = 0;
534 bool on = true;
535 int result, lang_flag;
536 const struct cl_option *option;
537 enum opt_code code;
538
539 opt = argv[0];
540
541 /* Interpret "-" or a non-switch as a file name. */
542 if (opt[0] != '-' || opt[1] == '\0')
543 {
544 if (!in_fname)
545 in_fname = opt;
546 else if (!out_fname)
547 out_fname = opt;
548 else
549 {
550 error ("too many filenames given. Type %s --help for usage",
551 progname);
552 return argc;
553 }
554
555 return 1;
556 }
557
558 /* Drop the "no-" from negative switches. */
559 if ((opt[1] == 'W' || opt[1] == 'f')
560 && opt[2] == 'n' && opt[3] == 'o' && opt[4] == '-')
561 {
562 size_t len = strlen (opt) - 3;
563
564 dup = xmalloc (len + 1);
565 dup[0] = '-';
566 dup[1] = opt[1];
567 memcpy (dup + 2, opt + 5, len - 2 + 1);
568 opt = dup;
569 on = false;
570 }
571
572 result = cpp_handle_option (parse_in, argc, argv);
573
574 /* Skip over '-'. */
575 lang_flag = lang_flags[(c_language << 1) + flag_objc];
576 opt_index = find_opt (opt + 1, lang_flag);
577 if (opt_index == N_OPTS)
578 goto done;
579
580 result = 1;
581 option = &cl_options[opt_index];
582
583 /* Sort out any argument the switch takes. */
584 if (option->flags & CL_ARG)
585 {
586 if (option->flags & CL_JOINED)
587 {
588 /* Have arg point to the original switch. This is because
589 some code, such as disable_builtin_function, expects its
590 argument to be persistent until the program exits. */
591 arg = argv[0] + cl_options[opt_index].opt_len + 1;
592 if (!on)
593 arg += strlen ("no-");
594 }
595
596 /* If we don't have an argument, and CL_SEPARATE, try the next
597 argument in the vector. */
598 if (!arg || (*arg == '\0' && option->flags & CL_SEPARATE))
599 {
600 arg = argv[1];
601 result = 2;
602 }
603
604 if (!arg || *arg == '\0')
605 {
606 missing_arg (opt_index);
607 result = argc;
608 goto done;
609 }
610 }
611
612 /* Complain about the wrong language after we've swallowed any
613 necessary extra argument. Eventually make this a hard error
614 after the call to find_opt, and return argc. */
615 if (!(cl_options[opt_index].flags & lang_flag))
616 {
617 complain_wrong_lang (opt_index);
618 goto done;
619 }
620
621 switch (code = option->opt_code)
622 {
623 case N_OPTS: /* Shut GCC up. */
624 break;
625
626 case OPT__help:
627 print_help ();
628 break;
629
630 case OPT_C:
631 cpp_opts->discard_comments = 0;
632 break;
633
634 case OPT_CC:
635 cpp_opts->discard_comments = 0;
636 cpp_opts->discard_comments_in_macro_exp = 0;
637 break;
638
639 case OPT_E:
640 flag_preprocess_only = 1;
641 break;
642
643 case OPT_H:
644 cpp_opts->print_include_names = 1;
645 break;
646
647 case OPT_M:
648 case OPT_MM:
649 /* When doing dependencies with -M or -MM, suppress normal
650 preprocessed output, but still do -dM etc. as software
651 depends on this. Preprocessed output does occur if -MD, -MMD
652 or environment var dependency generation is used. */
653 cpp_opts->deps.style = (code == OPT_M ? DEPS_SYSTEM: DEPS_USER);
654 cpp_opts->no_output = 1;
655 cpp_opts->inhibit_warnings = 1;
656 break;
657
658 case OPT_MD:
659 case OPT_MMD:
660 cpp_opts->deps.style = (code == OPT_MD ? DEPS_SYSTEM: DEPS_USER);
661 deps_file = arg;
662 break;
663
664 case OPT_MF:
665 deps_seen = true;
666 deps_file = arg;
667 break;
668
669 case OPT_MG:
670 deps_seen = true;
671 cpp_opts->deps.missing_files = true;
672 break;
673
674 case OPT_MP:
675 deps_seen = true;
676 cpp_opts->deps.phony_targets = true;
677 break;
678
679 case OPT_MQ:
680 case OPT_MT:
681 deps_seen = true;
682 defer_opt (code, arg);
683 break;
684
685 case OPT_P:
686 cpp_opts->no_line_commands = 1;
687 break;
688
689 case OPT_Wabi:
690 warn_abi = on;
691 break;
692
693 case OPT_Wall:
694 set_Wunused (on);
695 set_Wformat (on);
696 set_Wimplicit (on);
697 warn_char_subscripts = on;
698 warn_missing_braces = on;
699 warn_parentheses = on;
700 warn_return_type = on;
701 warn_sequence_point = on; /* Was C only. */
702 warn_sign_compare = on; /* Was C++ only. */
703 warn_switch = on;
704 warn_strict_aliasing = on;
705
706 /* Only warn about unknown pragmas that are not in system
707 headers. */
708 warn_unknown_pragmas = on;
709
710 /* We save the value of warn_uninitialized, since if they put
711 -Wuninitialized on the command line, we need to generate a
712 warning about not using it without also specifying -O. */
713 if (warn_uninitialized != 1)
714 warn_uninitialized = (on ? 2 : 0);
715
716 if (c_language == clk_c)
717 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding
718 can turn it off only if it's not explicit. */
719 warn_main = on * 2;
720 else
721 {
722 /* C++-specific warnings. */
723 warn_ctor_dtor_privacy = on;
724 warn_nonvdtor = on;
725 warn_reorder = on;
726 warn_nontemplate_friend = on;
727 }
728
729 cpp_opts->warn_trigraphs = on;
730 cpp_opts->warn_comments = on;
731 cpp_opts->warn_num_sign_change = on;
732 cpp_opts->warn_multichar = on; /* Was C++ only. */
733 break;
734
735 case OPT_Wbad_function_cast:
736 warn_bad_function_cast = on;
737 break;
738
739 case OPT_Wcast_qual:
740 warn_cast_qual = on;
741 break;
742
743 case OPT_Wchar_subscripts:
744 warn_char_subscripts = on;
745 break;
746
747 case OPT_Wcomment:
748 case OPT_Wcomments:
749 cpp_opts->warn_comments = on;
750 break;
751
752 case OPT_Wconversion:
753 warn_conversion = on;
754 break;
755
756 case OPT_Wctor_dtor_privacy:
757 warn_ctor_dtor_privacy = on;
758 break;
759
760 case OPT_Wdeprecated:
761 warn_deprecated = on;
762 break;
763
764 case OPT_Wdiv_by_zero:
765 warn_div_by_zero = on;
766 break;
767
768 case OPT_Weffcxx:
769 warn_ecpp = on;
770 break;
771
772 case OPT_Wendif_labels:
773 cpp_opts->warn_endif_labels = on;
774 break;
775
776 case OPT_Werror:
777 cpp_opts->warnings_are_errors = on;
778 break;
779
780 case OPT_Werror_implicit_function_decl:
781 if (!on)
782 result = 0;
783 else
784 mesg_implicit_function_declaration = 2;
785 break;
786
787 case OPT_Wfloat_equal:
788 warn_float_equal = on;
789 break;
790
791 case OPT_Wformat:
792 set_Wformat (on);
793 break;
794
795 case OPT_Wformat_eq:
796 set_Wformat (atoi (arg));
797 break;
798
799 case OPT_Wformat_extra_args:
800 warn_format_extra_args = on;
801 break;
802
803 case OPT_Wformat_nonliteral:
804 warn_format_nonliteral = on;
805 break;
806
807 case OPT_Wformat_security:
808 warn_format_security = on;
809 break;
810
811 case OPT_Wformat_y2k:
812 warn_format_y2k = on;
813 break;
814
815 case OPT_Wformat_zero_length:
816 warn_format_zero_length = on;
817 break;
818
819 case OPT_Wimplicit:
820 set_Wimplicit (on);
821 break;
822
823 case OPT_Wimplicit_function_decl:
824 mesg_implicit_function_declaration = on;
825 break;
826
827 case OPT_Wimplicit_int:
828 warn_implicit_int = on;
829 break;
830
831 case OPT_Wimport:
832 cpp_opts->warn_import = on;
833 break;
834
835 case OPT_Wlong_long:
836 warn_long_long = on;
837 break;
838
839 case OPT_Wmain:
840 if (on)
841 warn_main = 1;
842 else
843 warn_main = -1;
844 break;
845
846 case OPT_Wmissing_braces:
847 warn_missing_braces = on;
848 break;
849
850 case OPT_Wmissing_declarations:
851 warn_missing_declarations = on;
852 break;
853
854 case OPT_Wmissing_format_attribute:
855 warn_missing_format_attribute = on;
856 break;
857
858 case OPT_Wmissing_prototypes:
859 warn_missing_prototypes = on;
860 break;
861
862 case OPT_Wmultichar:
863 cpp_opts->warn_multichar = on;
864 break;
865
866 case OPT_Wnested_externs:
867 warn_nested_externs = on;
868 break;
869
870 case OPT_Wnon_template_friend:
871 warn_nontemplate_friend = on;
872 break;
873
874 case OPT_Wnon_virtual_dtor:
875 warn_nonvdtor = on;
876 break;
877
878 case OPT_Wnonnull:
879 warn_nonnull = on;
880 break;
881
882 case OPT_Wold_style_cast:
883 warn_old_style_cast = on;
884 break;
885
886 case OPT_Woverloaded_virtual:
887 warn_overloaded_virtual = on;
888 break;
889
890 case OPT_Wparentheses:
891 warn_parentheses = on;
892 break;
893
894 case OPT_Wpmf_conversions:
895 warn_pmf2ptr = on;
896 break;
897
898 case OPT_Wpointer_arith:
899 warn_pointer_arith = on;
900 break;
901
902 case OPT_Wprotocol:
903 warn_protocol = on;
904 break;
905
906 case OPT_Wselector:
907 warn_selector = on;
908 break;
909
910 case OPT_Wredundant_decls:
911 warn_redundant_decls = on;
912 break;
913
914 case OPT_Wreorder:
915 warn_reorder = on;
916 break;
917
918 case OPT_Wreturn_type:
919 warn_return_type = on;
920 break;
921
922 case OPT_Wsequence_point:
923 warn_sequence_point = on;
924 break;
925
926 case OPT_Wsign_compare:
927 warn_sign_compare = on;
928 break;
929
930 case OPT_Wsign_promo:
931 warn_sign_promo = on;
932 break;
933
934 case OPT_Wstrict_prototypes:
935 if (!on && c_language == clk_cplusplus)
936 warning ("-Wno-strict-prototypes is not supported in C++");
937 else
938 warn_strict_prototypes = on;
939 break;
940
941 case OPT_Wsynth:
942 warn_synth = on;
943 break;
944
945 case OPT_Wsystem_headers:
946 cpp_opts->warn_system_headers = on;
947 break;
948
949 case OPT_Wtraditional:
950 warn_traditional = on;
951 cpp_opts->warn_traditional = on;
952 break;
953
954 case OPT_Wtrigraphs:
955 cpp_opts->warn_trigraphs = on;
956 break;
957
958 case OPT_Wundeclared_selector:
959 warn_undeclared_selector = on;
960 break;
961
962 case OPT_Wundef:
963 cpp_opts->warn_undef = on;
964 break;
965
966 case OPT_Wunknown_pragmas:
967 /* Set to greater than 1, so that even unknown pragmas in
968 system headers will be warned about. */
969 warn_unknown_pragmas = on * 2;
970 break;
971
972 case OPT_Wunused_macros:
973 cpp_opts->warn_unused_macros = on;
974 break;
975
976 case OPT_Wwrite_strings:
977 if (c_language == clk_c)
978 flag_const_strings = on;
979 else
980 warn_write_strings = on;
981 break;
982
983 case OPT_ansi:
984 if (c_language == clk_c)
985 set_std_c89 (false, true);
986 else
987 set_std_cxx98 (true);
988 break;
989
990 case OPT_d:
991 handle_OPT_d (arg);
992 break;
993
994 case OPT_fcond_mismatch:
995 if (c_language == clk_c)
996 {
997 flag_cond_mismatch = on;
998 break;
999 }
1000 /* Fall through. */
1001
1002 case OPT_fall_virtual:
1003 case OPT_fenum_int_equiv:
1004 case OPT_fguiding_decls:
1005 case OPT_fhonor_std:
1006 case OPT_fhuge_objects:
1007 case OPT_flabels_ok:
1008 case OPT_fname_mangling:
1009 case OPT_fnew_abi:
1010 case OPT_fnonnull_objects:
1011 case OPT_fsquangle:
1012 case OPT_fstrict_prototype:
1013 case OPT_fthis_is_variable:
1014 case OPT_fvtable_thunks:
1015 case OPT_fxref:
1016 warning ("switch \"%s\" is no longer supported", argv[0]);
1017 break;
1018
1019 case OPT_fabi_version:
1020 flag_abi_version = read_integral_parameter (arg, argv[0], 1);
1021 break;
1022
1023 case OPT_faccess_control:
1024 flag_access_control = on;
1025 break;
1026
1027 case OPT_falt_external_templates:
1028 flag_alt_external_templates = on;
1029 if (on)
1030 flag_external_templates = true;
1031 cp_deprecated:
1032 warning ("switch \"%s\" is deprecated, please see documentation for details", argv[0]);
1033 break;
1034
1035 case OPT_fasm:
1036 flag_no_asm = !on;
1037 break;
1038
1039 case OPT_fbuiltin:
1040 flag_no_builtin = !on;
1041 break;
1042
1043 case OPT_fbuiltin_:
1044 if (on)
1045 result = 0;
1046 else
1047 disable_builtin_function (arg);
1048 break;
1049
1050 case OPT_fdollars_in_identifiers:
1051 dollars_in_ident = on;
1052 break;
1053
1054 case OPT_fdump:
1055 if (!on || !dump_switch_p (argv[0] + strlen ("-f")))
1056 result = 0;
1057 break;
1058
1059 case OPT_ffreestanding:
1060 on = !on;
1061 /* Fall through... */
1062 case OPT_fhosted:
1063 flag_hosted = on;
1064 flag_no_builtin = !on;
1065 /* warn_main will be 2 if set by -Wall, 1 if set by -Wmain */
1066 if (!on && warn_main == 2)
1067 warn_main = 0;
1068 break;
1069
1070 case OPT_fshort_double:
1071 flag_short_double = on;
1072 break;
1073
1074 case OPT_fshort_enums:
1075 flag_short_enums = on;
1076 break;
1077
1078 case OPT_fshort_wchar:
1079 flag_short_wchar = on;
1080 break;
1081
1082 case OPT_fsigned_bitfields:
1083 flag_signed_bitfields = on;
1084 explicit_flag_signed_bitfields = 1;
1085 break;
1086
1087 case OPT_fsigned_char:
1088 flag_signed_char = on;
1089 break;
1090
1091 case OPT_funsigned_bitfields:
1092 flag_signed_bitfields = !on;
1093 explicit_flag_signed_bitfields = 1;
1094 break;
1095
1096 case OPT_funsigned_char:
1097 flag_signed_char = !on;
1098 break;
1099
1100 case OPT_fcheck_new:
1101 flag_check_new = on;
1102 break;
1103
1104 case OPT_fconserve_space:
1105 flag_conserve_space = on;
1106 break;
1107
1108 case OPT_fconst_strings:
1109 flag_const_strings = on;
1110 break;
1111
1112 case OPT_fconstant_string_class:
1113 constant_string_class_name = arg;
1114 break;
1115
1116 case OPT_fdefault_inline:
1117 flag_default_inline = on;
1118 break;
1119
1120 case OPT_felide_constructors:
1121 flag_elide_constructors = on;
1122 break;
1123
1124 case OPT_fenforce_eh_specs:
1125 flag_enforce_eh_specs = on;
1126 break;
1127
1128 case OPT_fexternal_templates:
1129 flag_external_templates = on;
1130 goto cp_deprecated;
1131
1132 case OPT_ffor_scope:
1133 flag_new_for_scope = on;
1134 break;
1135
1136 case OPT_fgnu_keywords:
1137 flag_no_gnu_keywords = !on;
1138 break;
1139
1140 case OPT_fgnu_runtime:
1141 flag_next_runtime = !on;
1142 break;
1143
1144 case OPT_fhandle_exceptions:
1145 warning ("-fhandle-exceptions has been renamed to -fexceptions (and is now on by default)");
1146 flag_exceptions = on;
1147 break;
1148
1149 case OPT_fimplement_inlines:
1150 flag_implement_inlines = on;
1151 break;
1152
1153 case OPT_fimplicit_inline_templates:
1154 flag_implicit_inline_templates = on;
1155 break;
1156
1157 case OPT_fimplicit_templates:
1158 flag_implicit_templates = on;
1159 break;
1160
1161 case OPT_fms_extensions:
1162 flag_ms_extensions = on;
1163 break;
1164
1165 case OPT_fnext_runtime:
1166 flag_next_runtime = on;
1167 break;
1168
1169 case OPT_fnonansi_builtins:
1170 flag_no_nonansi_builtin = !on;
1171 break;
1172
1173 case OPT_foperator_names:
1174 cpp_opts->operator_names = on;
1175 break;
1176
1177 case OPT_foptional_diags:
1178 flag_optional_diags = on;
1179 break;
1180
1181 case OPT_fpermissive:
1182 flag_permissive = on;
1183 break;
1184
1185 case OPT_fpreprocessed:
1186 cpp_opts->preprocessed = on;
1187 break;
1188
1189 case OPT_frepo:
1190 flag_use_repository = on;
1191 if (on)
1192 flag_implicit_templates = 0;
1193 break;
1194
1195 case OPT_frtti:
1196 flag_rtti = on;
1197 break;
1198
1199 case OPT_fshow_column:
1200 cpp_opts->show_column = on;
1201 break;
1202
1203 case OPT_fstats:
1204 flag_detailed_statistics = on;
1205 break;
1206
1207 case OPT_ftabstop:
1208 /* Don't recognize -fno-tabstop=. */
1209 if (!on)
1210 return 0;
1211
1212 /* It is documented that we silently ignore silly values. */
1213 {
1214 char *endptr;
1215 long tabstop = strtol (arg, &endptr, 10);
1216 if (*endptr == '\0' && tabstop >= 1 && tabstop <= 100)
1217 cpp_opts->tabstop = tabstop;
1218 }
1219 break;
1220
1221 case OPT_ftemplate_depth:
1222 max_tinst_depth = read_integral_parameter (arg, argv[0], 0);
1223 break;
1224
1225 case OPT_fvtable_gc:
1226 flag_vtable_gc = on;
1227 break;
1228
1229 case OPT_fuse_cxa_atexit:
1230 flag_use_cxa_atexit = on;
1231 break;
1232
1233 case OPT_fweak:
1234 flag_weak = on;
1235 break;
1236
1237 case OPT_gen_decls:
1238 flag_gen_declaration = 1;
1239 break;
1240
1241 case OPT_lang_asm:
1242 cpp_set_lang (parse_in, CLK_ASM);
1243 break;
1244
1245 case OPT_lang_objc:
1246 cpp_opts->objc = 1;
1247 break;
1248
1249 case OPT_nostdinc:
1250 /* No default include directories. You must specify all
1251 include-file directories with -I. */
1252 cpp_opts->no_standard_includes = 1;
1253 break;
1254
1255 case OPT_nostdincplusplus:
1256 /* No default C++-specific include directories. */
1257 cpp_opts->no_standard_cplusplus_includes = 1;
1258 break;
1259
1260 case OPT_o:
1261 if (!out_fname)
1262 out_fname = arg;
1263 else
1264 {
1265 error ("output filename specified twice");
1266 result = argc;
1267 }
1268 break;
1269
1270 /* We need to handle the -pedantic switches here, rather than in
1271 c_common_post_options, so that a subsequent -Wno-endif-labels
1272 is not overridden. */
1273 case OPT_pedantic_errors:
1274 cpp_opts->pedantic_errors = 1;
1275 /* fall through */
1276 case OPT_pedantic:
1277 cpp_opts->pedantic = 1;
1278 cpp_opts->warn_endif_labels = 1;
1279 break;
1280
1281 case OPT_print_objc_runtime_info:
1282 print_struct_values = 1;
1283 break;
1284
1285 case OPT_remap:
1286 cpp_opts->remap = 1;
1287 break;
1288
1289 case OPT_std_cplusplus98:
1290 case OPT_std_gnuplusplus98:
1291 set_std_cxx98 (code == OPT_std_cplusplus98 /* ISO */);
1292 break;
1293
1294 case OPT_std_c89:
1295 case OPT_std_iso9899_1990:
1296 case OPT_std_iso9899_199409:
1297 set_std_c89 (code == OPT_std_iso9899_199409 /* c94 */, true /* ISO */);
1298 break;
1299
1300 case OPT_std_gnu89:
1301 set_std_c89 (false /* c94 */, false /* ISO */);
1302 break;
1303
1304 case OPT_std_c99:
1305 case OPT_std_c9x:
1306 case OPT_std_iso9899_1999:
1307 case OPT_std_iso9899_199x:
1308 set_std_c99 (true /* ISO */);
1309 break;
1310
1311 case OPT_std_gnu99:
1312 case OPT_std_gnu9x:
1313 set_std_c99 (false /* ISO */);
1314 break;
1315
1316 case OPT_trigraphs:
1317 cpp_opts->trigraphs = 1;
1318 break;
1319
1320 case OPT_traditional_cpp:
1321 cpp_opts->traditional = 1;
1322 break;
1323
1324 case OPT_undef:
1325 flag_undef = 1;
1326 break;
1327
1328 case OPT_w:
1329 cpp_opts->inhibit_warnings = 1;
1330 break;
1331
1332 case OPT_v:
1333 cpp_opts->verbose = 1;
1334 break;
1335 }
1336
1337 done:
1338 if (dup)
1339 free (dup);
1340 return result;
1341 }
1342
1343 /* Post-switch processing. */
1344 bool
1345 c_common_post_options ()
1346 {
1347 /* Canonicalize the input and output filenames. */
1348 if (in_fname == NULL || !strcmp (in_fname, "-"))
1349 in_fname = "";
1350
1351 if (out_fname == NULL || !strcmp (out_fname, "-"))
1352 out_fname = "";
1353
1354 if (cpp_opts->deps.style == DEPS_NONE)
1355 check_deps_environment_vars ();
1356
1357 handle_deferred_opts ();
1358
1359 sanitize_cpp_opts ();
1360
1361 flag_inline_trees = 1;
1362
1363 /* Use tree inlining if possible. Function instrumentation is only
1364 done in the RTL level, so we disable tree inlining. */
1365 if (! flag_instrument_function_entry_exit)
1366 {
1367 if (!flag_no_inline)
1368 flag_no_inline = 1;
1369 if (flag_inline_functions)
1370 {
1371 flag_inline_trees = 2;
1372 flag_inline_functions = 0;
1373 }
1374 }
1375
1376 /* Special format checking options don't work without -Wformat; warn if
1377 they are used. */
1378 if (warn_format_y2k && !warn_format)
1379 warning ("-Wformat-y2k ignored without -Wformat");
1380 if (warn_format_extra_args && !warn_format)
1381 warning ("-Wformat-extra-args ignored without -Wformat");
1382 if (warn_format_zero_length && !warn_format)
1383 warning ("-Wformat-zero-length ignored without -Wformat");
1384 if (warn_format_nonliteral && !warn_format)
1385 warning ("-Wformat-nonliteral ignored without -Wformat");
1386 if (warn_format_security && !warn_format)
1387 warning ("-Wformat-security ignored without -Wformat");
1388 if (warn_missing_format_attribute && !warn_format)
1389 warning ("-Wmissing-format-attribute ignored without -Wformat");
1390
1391 /* If an error has occurred in cpplib, note it so we fail
1392 immediately. */
1393 errorcount += cpp_errors (parse_in);
1394
1395 return flag_preprocess_only;
1396 }
1397
1398 /* Preprocess the input file to out_stream. */
1399 static void
1400 preprocess_file ()
1401 {
1402 /* Open the output now. We must do so even if no_output is on,
1403 because there may be other output than from the actual
1404 preprocessing (e.g. from -dM). */
1405 if (out_fname[0] == '\0')
1406 out_stream = stdout;
1407 else
1408 out_stream = fopen (out_fname, "w");
1409
1410 if (out_stream == NULL)
1411 fatal_io_error ("opening output file %s", out_fname);
1412 else
1413 cpp_preprocess_file (parse_in, in_fname, out_stream);
1414 }
1415
1416 /* Front end initialization common to C, ObjC and C++. */
1417 const char *
1418 c_common_init (filename)
1419 const char *filename;
1420 {
1421 /* Set up preprocessor arithmetic. Must be done after call to
1422 c_common_nodes_and_builtins for type nodes to be good. */
1423 cpp_opts->precision = TYPE_PRECISION (intmax_type_node);
1424 cpp_opts->char_precision = TYPE_PRECISION (char_type_node);
1425 cpp_opts->int_precision = TYPE_PRECISION (integer_type_node);
1426 cpp_opts->wchar_precision = TYPE_PRECISION (wchar_type_node);
1427 cpp_opts->unsigned_wchar = TREE_UNSIGNED (wchar_type_node);
1428
1429 /* Register preprocessor built-ins before calls to
1430 cpp_main_file. */
1431 cpp_get_callbacks (parse_in)->register_builtins = cb_register_builtins;
1432
1433 /* NULL is passed up to toplev.c and we exit quickly. */
1434 if (flag_preprocess_only)
1435 {
1436 preprocess_file ();
1437 return NULL;
1438 }
1439
1440 /* Do this before initializing pragmas, as then cpplib's hash table
1441 has been set up. NOTE: we are using our own file name here, not
1442 the one supplied. */
1443 filename = init_c_lex (in_fname);
1444
1445 init_pragma ();
1446
1447 return filename;
1448 }
1449
1450 /* Common finish hook for the C, ObjC and C++ front ends. */
1451 void
1452 c_common_finish ()
1453 {
1454 FILE *deps_stream = NULL;
1455
1456 if (cpp_opts->deps.style != DEPS_NONE)
1457 {
1458 /* If -M or -MM was seen without -MF, default output to the
1459 output stream. */
1460 if (!deps_file)
1461 deps_stream = out_stream;
1462 else
1463 {
1464 deps_stream = fopen (deps_file, deps_append ? "a": "w");
1465 if (!deps_stream)
1466 fatal_io_error ("opening dependency file %s", deps_file);
1467 }
1468 }
1469
1470 /* For performance, avoid tearing down cpplib's internal structures
1471 with cpp_destroy (). */
1472 errorcount += cpp_finish (parse_in, deps_stream);
1473
1474 if (deps_stream && deps_stream != out_stream
1475 && (ferror (deps_stream) || fclose (deps_stream)))
1476 fatal_io_error ("closing dependency file %s", deps_file);
1477
1478 if (out_stream && (ferror (out_stream) || fclose (out_stream)))
1479 fatal_io_error ("when writing output to %s", out_fname);
1480 }
1481
1482 /* Either of two environment variables can specify output of
1483 dependencies. Their value is either "OUTPUT_FILE" or "OUTPUT_FILE
1484 DEPS_TARGET", where OUTPUT_FILE is the file to write deps info to
1485 and DEPS_TARGET is the target to mention in the deps. They also
1486 result in dependency information being appended to the output file
1487 rather than overwriting it, and like Sun's compiler
1488 SUNPRO_DEPENDENCIES suppresses the dependency on the main file. */
1489 static void
1490 check_deps_environment_vars ()
1491 {
1492 char *spec;
1493
1494 GET_ENVIRONMENT (spec, "DEPENDENCIES_OUTPUT");
1495 if (spec)
1496 cpp_opts->deps.style = DEPS_USER;
1497 else
1498 {
1499 GET_ENVIRONMENT (spec, "SUNPRO_DEPENDENCIES");
1500 if (spec)
1501 {
1502 cpp_opts->deps.style = DEPS_SYSTEM;
1503 cpp_opts->deps.ignore_main_file = true;
1504 }
1505 }
1506
1507 if (spec)
1508 {
1509 /* Find the space before the DEPS_TARGET, if there is one. */
1510 char *s = strchr (spec, ' ');
1511 if (s)
1512 {
1513 /* Let the caller perform MAKE quoting. */
1514 defer_opt (OPT_MT, s + 1);
1515 *s = '\0';
1516 }
1517
1518 /* Command line -MF overrides environment variables and default. */
1519 if (!deps_file)
1520 deps_file = spec;
1521
1522 deps_append = 1;
1523 }
1524 }
1525
1526 /* Handle deferred command line switches. */
1527 static void
1528 handle_deferred_opts ()
1529 {
1530 size_t i;
1531
1532 for (i = 0; i < deferred_count; i++)
1533 {
1534 struct deferred_opt *opt = &deferred_opts[i];
1535
1536 switch (opt->code)
1537 {
1538 case OPT_MT:
1539 case OPT_MQ:
1540 cpp_add_dependency_target (parse_in, opt->arg, opt->code == OPT_MQ);
1541 break;
1542
1543 default:
1544 abort ();
1545 }
1546 }
1547
1548 free (deferred_opts);
1549 }
1550
1551 /* These settings are appropriate for GCC, but not necessarily so for
1552 cpplib as a library. */
1553 static void
1554 sanitize_cpp_opts ()
1555 {
1556 /* If we don't know what style of dependencies to output, complain
1557 if any other dependency switches have been given. */
1558 if (deps_seen && cpp_opts->deps.style == DEPS_NONE)
1559 error ("to generate dependencies you must specify either -M or -MM");
1560
1561 /* -dM and dependencies suppress normal output; do it here so that
1562 the last -d[MDN] switch overrides earlier ones. */
1563 if (cpp_opts->dump_macros == dump_only)
1564 cpp_opts->no_output = 1;
1565
1566 /* Disable -dD, -dN and -dI if normal output is suppressed. Allow
1567 -dM since at least glibc relies on -M -dM to work. */
1568 if (cpp_opts->no_output)
1569 {
1570 if (cpp_opts->dump_macros != dump_only)
1571 cpp_opts->dump_macros = dump_none;
1572 cpp_opts->dump_includes = 0;
1573 }
1574
1575 cpp_opts->unsigned_char = !flag_signed_char;
1576 cpp_opts->stdc_0_in_system_headers = STDC_0_IN_SYSTEM_HEADERS;
1577
1578 /* We want -Wno-long-long to override -pedantic -std=non-c99
1579 and/or -Wtraditional, whatever the ordering. */
1580 cpp_opts->warn_long_long
1581 = warn_long_long && ((!flag_isoc99 && pedantic) || warn_traditional);
1582 }
1583
1584 /* Set the C 89 standard (with 1994 amendments if C94, without GNU
1585 extensions if ISO). There is no concept of gnu94. */
1586 static void
1587 set_std_c89 (c94, iso)
1588 int c94, iso;
1589 {
1590 cpp_set_lang (parse_in, c94 ? CLK_STDC94: iso ? CLK_STDC89: CLK_GNUC89);
1591 flag_iso = iso;
1592 flag_no_asm = iso;
1593 flag_no_gnu_keywords = iso;
1594 flag_no_nonansi_builtin = iso;
1595 flag_noniso_default_format_attributes = !iso;
1596 flag_isoc94 = c94;
1597 flag_isoc99 = 0;
1598 flag_writable_strings = 0;
1599 }
1600
1601 /* Set the C 99 standard (without GNU extensions if ISO). */
1602 static void
1603 set_std_c99 (iso)
1604 int iso;
1605 {
1606 cpp_set_lang (parse_in, iso ? CLK_STDC99: CLK_GNUC99);
1607 flag_no_asm = iso;
1608 flag_no_nonansi_builtin = iso;
1609 flag_noniso_default_format_attributes = !iso;
1610 flag_iso = iso;
1611 flag_isoc99 = 1;
1612 flag_isoc94 = 1;
1613 flag_writable_strings = 0;
1614 }
1615
1616 /* Set the C++ 98 standard (without GNU extensions if ISO). */
1617 static void
1618 set_std_cxx98 (iso)
1619 int iso;
1620 {
1621 cpp_set_lang (parse_in, iso ? CLK_CXX98: CLK_GNUCXX);
1622 flag_no_gnu_keywords = iso;
1623 flag_no_nonansi_builtin = iso;
1624 flag_noniso_default_format_attributes = !iso;
1625 flag_iso = iso;
1626 }
1627
1628 /* Handle setting implicit to ON. */
1629 static void
1630 set_Wimplicit (on)
1631 int on;
1632 {
1633 warn_implicit = on;
1634 warn_implicit_int = on;
1635 if (on)
1636 {
1637 if (mesg_implicit_function_declaration != 2)
1638 mesg_implicit_function_declaration = 1;
1639 }
1640 else
1641 mesg_implicit_function_declaration = 0;
1642 }
1643
1644 /* Args to -d specify what to dump. Silently ignore
1645 unrecognized options; they may be aimed at toplev.c. */
1646 static void
1647 handle_OPT_d (arg)
1648 const char *arg;
1649 {
1650 char c;
1651
1652 while ((c = *arg++) != '\0')
1653 switch (c)
1654 {
1655 case 'M':
1656 cpp_opts->dump_macros = dump_only;
1657 break;
1658
1659 case 'N':
1660 cpp_opts->dump_macros = dump_names;
1661 break;
1662
1663 case 'D':
1664 cpp_opts->dump_macros = dump_definitions;
1665 break;
1666
1667 case 'I':
1668 cpp_opts->dump_includes = 1;
1669 break;
1670 }
1671 }
1672
1673 /* Write a slash-separated list of languages in FLAGS to BUF. */
1674 static void
1675 write_langs (buf, flags)
1676 char *buf;
1677 int flags;
1678 {
1679 *buf = '\0';
1680 if (flags & CL_C_ONLY)
1681 strcat (buf, "C");
1682 if (flags & CL_OBJC_ONLY)
1683 {
1684 if (*buf)
1685 strcat (buf, "/");
1686 strcat (buf, "ObjC");
1687 }
1688 if (flags & CL_CXX_ONLY)
1689 {
1690 if (*buf)
1691 strcat (buf, "/");
1692 strcat (buf, "C++");
1693 }
1694 }
1695
1696 /* Complain that switch OPT_INDEX does not apply to this front end. */
1697 static void
1698 complain_wrong_lang (opt_index)
1699 size_t opt_index;
1700 {
1701 char ok_langs[60], bad_langs[60];
1702 int ok_flags = cl_options[opt_index].flags;
1703
1704 write_langs (ok_langs, ok_flags);
1705 write_langs (bad_langs, ~ok_flags);
1706 warning ("\"-%s\" is valid for %s but not for %s",
1707 cl_options[opt_index].opt_text, ok_langs, bad_langs);
1708 }
1709
1710 /* Handle --help output. */
1711 static void
1712 print_help ()
1713 {
1714 /* To keep the lines from getting too long for some compilers, limit
1715 to about 500 characters (6 lines) per chunk. */
1716 fputs (_("\
1717 Switches:\n\
1718 -include <file> Include the contents of <file> before other files\n\
1719 -imacros <file> Accept definition of macros in <file>\n\
1720 -iprefix <path> Specify <path> as a prefix for next two options\n\
1721 -iwithprefix <dir> Add <dir> to the end of the system include path\n\
1722 -iwithprefixbefore <dir> Add <dir> to the end of the main include path\n\
1723 -isystem <dir> Add <dir> to the start of the system include path\n\
1724 "), stdout);
1725 fputs (_("\
1726 -idirafter <dir> Add <dir> to the end of the system include path\n\
1727 -I <dir> Add <dir> to the end of the main include path\n\
1728 -I- Fine-grained include path control; see info docs\n\
1729 -nostdinc Do not search system include directories\n\
1730 (dirs specified with -isystem will still be used)\n\
1731 -nostdinc++ Do not search system include directories for C++\n\
1732 -o <file> Put output into <file>\n\
1733 "), stdout);
1734 fputs (_("\
1735 -trigraphs Support ISO C trigraphs\n\
1736 -std=<std name> Specify the conformance standard; one of:\n\
1737 gnu89, gnu99, c89, c99, iso9899:1990,\n\
1738 iso9899:199409, iso9899:1999, c++98\n\
1739 -w Inhibit warning messages\n\
1740 -W[no-]trigraphs Warn if trigraphs are encountered\n\
1741 -W[no-]comment{s} Warn if one comment starts inside another\n\
1742 "), stdout);
1743 fputs (_("\
1744 -W[no-]traditional Warn about features not present in traditional C\n\
1745 -W[no-]undef Warn if an undefined macro is used by #if\n\
1746 -W[no-]import Warn about the use of the #import directive\n\
1747 "), stdout);
1748 fputs (_("\
1749 -W[no-]error Treat all warnings as errors\n\
1750 -W[no-]system-headers Do not suppress warnings from system headers\n\
1751 -W[no-]all Enable most preprocessor warnings\n\
1752 "), stdout);
1753 fputs (_("\
1754 -M Generate make dependencies\n\
1755 -MM As -M, but ignore system header files\n\
1756 -MD Generate make dependencies and compile\n\
1757 -MMD As -MD, but ignore system header files\n\
1758 -MF <file> Write dependency output to the given file\n\
1759 -MG Treat missing header file as generated files\n\
1760 "), stdout);
1761 fputs (_("\
1762 -MP Generate phony targets for all headers\n\
1763 -MQ <target> Add a MAKE-quoted target\n\
1764 -MT <target> Add an unquoted target\n\
1765 "), stdout);
1766 fputs (_("\
1767 -D<macro> Define a <macro> with string '1' as its value\n\
1768 -D<macro>=<val> Define a <macro> with <val> as its value\n\
1769 -A<question>=<answer> Assert the <answer> to <question>\n\
1770 -A-<question>=<answer> Disable the <answer> to <question>\n\
1771 -U<macro> Undefine <macro> \n\
1772 -v Display the version number\n\
1773 "), stdout);
1774 fputs (_("\
1775 -H Print the name of header files as they are used\n\
1776 -C Do not discard comments\n\
1777 -dM Display a list of macro definitions active at end\n\
1778 -dD Preserve macro definitions in output\n\
1779 -dN As -dD except that only the names are preserved\n\
1780 -dI Include #include directives in the output\n\
1781 "), stdout);
1782 fputs (_("\
1783 -f[no-]preprocessed Treat the input file as already preprocessed\n\
1784 -ftabstop=<number> Distance between tab stops for column reporting\n\
1785 -P Do not generate #line directives\n\
1786 -remap Remap file names when including files\n\
1787 --help Display this information\n\
1788 "), stdout);
1789 }
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