1 /* Command line option handling.
2 Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
3 Free Software Foundation, Inc.
4 Contributed by Neil Booth.
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 3, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
25 #include "coretypes.h"
32 #include "langhooks.h"
38 #include "diagnostic.h"
39 #include "opts-diagnostic.h"
40 #include "insn-attr.h" /* For INSN_SCHEDULING. */
42 #include "tree-pass.h"
47 #include "lto-streamer.h"
49 /* True if we should exit after parsing options. */
50 bool exit_after_options;
52 /* True to warn about any objects definitions whose size is larger
53 than N bytes. Also want about function definitions whose returned
54 values are larger than N bytes, where N is `larger_than_size'. */
55 bool warn_larger_than;
56 HOST_WIDE_INT larger_than_size;
58 /* True to warn about any function whose frame size is larger
60 bool warn_frame_larger_than;
61 HOST_WIDE_INT frame_larger_than_size;
63 /* Type(s) of debugging information we are producing (if any). See
64 flags.h for the definitions of the different possible types of
65 debugging information. */
66 enum debug_info_type write_symbols = NO_DEBUG;
68 /* Level of debugging information we are producing. See flags.h for
69 the definitions of the different possible levels. */
70 enum debug_info_level debug_info_level = DINFO_LEVEL_NONE;
72 /* A major contribution to object and executable size is debug
73 information size. A major contribution to debug information size
74 is struct descriptions replicated in several object files. The
75 following flags attempt to reduce this information. The basic
76 idea is to not emit struct debugging information in the current
77 compilation unit when that information will be generated by
78 another compilation unit.
80 Debug information for a struct defined in the current source
81 file should be generated in the object file. Likewise the
82 debug information for a struct defined in a header should be
83 generated in the object file of the corresponding source file.
84 Both of these case are handled when the base name of the file of
85 the struct definition matches the base name of the source file
86 of the current compilation unit. This matching emits minimal
87 struct debugging information.
89 The base file name matching rule above will fail to emit debug
90 information for structs defined in system headers. So a second
91 category of files includes system headers in addition to files
94 The remaining types of files are library headers and application
95 headers. We cannot currently distinguish these two types. */
97 enum debug_struct_file
99 DINFO_STRUCT_FILE_NONE, /* Debug no structs. */
100 DINFO_STRUCT_FILE_BASE, /* Debug structs defined in files with the
101 same base name as the compilation unit. */
102 DINFO_STRUCT_FILE_SYS, /* Also debug structs defined in system
104 DINFO_STRUCT_FILE_ANY /* Debug structs defined in all files. */
107 /* Generic structs (e.g. templates not explicitly specialized)
108 may not have a compilation unit associated with them, and so
109 may need to be treated differently from ordinary structs.
111 Structs only handled by reference (indirectly), will also usually
112 not need as much debugging information. */
114 static enum debug_struct_file debug_struct_ordinary[DINFO_USAGE_NUM_ENUMS]
115 = { DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY };
116 static enum debug_struct_file debug_struct_generic[DINFO_USAGE_NUM_ENUMS]
117 = { DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY };
119 /* Run the second compilation of -fcompare-debug. Not defined using
120 Var in common.opt because this is used in Ada code and so must be
121 an actual variable not a macro. */
122 int flag_compare_debug;
124 /* Parse the -femit-struct-debug-detailed option value
125 and set the flag variables. */
127 #define MATCH( prefix, string ) \
128 ((strncmp (prefix, string, sizeof prefix - 1) == 0) \
129 ? ((string += sizeof prefix - 1), 1) : 0)
132 set_struct_debug_option (const char *spec)
134 /* various labels for comparison */
135 static char dfn_lbl[] = "dfn:", dir_lbl[] = "dir:", ind_lbl[] = "ind:";
136 static char ord_lbl[] = "ord:", gen_lbl[] = "gen:";
137 static char none_lbl[] = "none", any_lbl[] = "any";
138 static char base_lbl[] = "base", sys_lbl[] = "sys";
140 enum debug_struct_file files = DINFO_STRUCT_FILE_ANY;
141 /* Default is to apply to as much as possible. */
142 enum debug_info_usage usage = DINFO_USAGE_NUM_ENUMS;
143 int ord = 1, gen = 1;
146 if (MATCH (dfn_lbl, spec))
147 usage = DINFO_USAGE_DFN;
148 else if (MATCH (dir_lbl, spec))
149 usage = DINFO_USAGE_DIR_USE;
150 else if (MATCH (ind_lbl, spec))
151 usage = DINFO_USAGE_IND_USE;
153 /* Generics or not? */
154 if (MATCH (ord_lbl, spec))
156 else if (MATCH (gen_lbl, spec))
159 /* What allowable environment? */
160 if (MATCH (none_lbl, spec))
161 files = DINFO_STRUCT_FILE_NONE;
162 else if (MATCH (any_lbl, spec))
163 files = DINFO_STRUCT_FILE_ANY;
164 else if (MATCH (sys_lbl, spec))
165 files = DINFO_STRUCT_FILE_SYS;
166 else if (MATCH (base_lbl, spec))
167 files = DINFO_STRUCT_FILE_BASE;
169 error ("argument %qs to %<-femit-struct-debug-detailed%> not recognized",
172 /* Effect the specification. */
173 if (usage == DINFO_USAGE_NUM_ENUMS)
177 debug_struct_ordinary[DINFO_USAGE_DFN] = files;
178 debug_struct_ordinary[DINFO_USAGE_DIR_USE] = files;
179 debug_struct_ordinary[DINFO_USAGE_IND_USE] = files;
183 debug_struct_generic[DINFO_USAGE_DFN] = files;
184 debug_struct_generic[DINFO_USAGE_DIR_USE] = files;
185 debug_struct_generic[DINFO_USAGE_IND_USE] = files;
191 debug_struct_ordinary[usage] = files;
193 debug_struct_generic[usage] = files;
197 set_struct_debug_option (spec+1);
200 /* No more -femit-struct-debug-detailed specifications.
203 error ("argument %qs to %<-femit-struct-debug-detailed%> unknown",
205 if (debug_struct_ordinary[DINFO_USAGE_DIR_USE]
206 < debug_struct_ordinary[DINFO_USAGE_IND_USE]
207 || debug_struct_generic[DINFO_USAGE_DIR_USE]
208 < debug_struct_generic[DINFO_USAGE_IND_USE])
209 error ("%<-femit-struct-debug-detailed=dir:...%> must allow at least"
210 " as much as %<-femit-struct-debug-detailed=ind:...%>");
214 /* Find the base name of a path, stripping off both directories and
215 a single final extension. */
217 base_of_path (const char *path, const char **base_out)
219 const char *base = path;
221 const char *p = path;
225 if (IS_DIR_SEPARATOR(c))
240 /* Match the base name of a file to the base name of a compilation unit. */
242 static const char *main_input_basename;
243 static int main_input_baselength;
246 matches_main_base (const char *path)
248 /* Cache the last query. */
249 static const char *last_path = NULL;
250 static int last_match = 0;
251 if (path != last_path)
254 int length = base_of_path (path, &base);
256 last_match = (length == main_input_baselength
257 && memcmp (base, main_input_basename, length) == 0);
262 #ifdef DEBUG_DEBUG_STRUCT
265 dump_struct_debug (tree type, enum debug_info_usage usage,
266 enum debug_struct_file criterion, int generic,
267 int matches, int result)
269 /* Find the type name. */
270 tree type_decl = TYPE_STUB_DECL (type);
272 const char *name = 0;
273 if (TREE_CODE (t) == TYPE_DECL)
276 name = IDENTIFIER_POINTER (t);
278 fprintf (stderr, " struct %d %s %s %s %s %d %p %s\n",
280 DECL_IN_SYSTEM_HEADER (type_decl) ? "sys" : "usr",
281 matches ? "bas" : "hdr",
282 generic ? "gen" : "ord",
283 usage == DINFO_USAGE_DFN ? ";" :
284 usage == DINFO_USAGE_DIR_USE ? "." : "*",
286 (void*) type_decl, name);
289 #define DUMP_GSTRUCT(type, usage, criterion, generic, matches, result) \
290 dump_struct_debug (type, usage, criterion, generic, matches, result)
294 #define DUMP_GSTRUCT(type, usage, criterion, generic, matches, result) \
301 should_emit_struct_debug (tree type, enum debug_info_usage usage)
303 enum debug_struct_file criterion;
305 bool generic = lang_hooks.types.generic_p (type);
308 criterion = debug_struct_generic[usage];
310 criterion = debug_struct_ordinary[usage];
312 if (criterion == DINFO_STRUCT_FILE_NONE)
313 return DUMP_GSTRUCT (type, usage, criterion, generic, false, false);
314 if (criterion == DINFO_STRUCT_FILE_ANY)
315 return DUMP_GSTRUCT (type, usage, criterion, generic, false, true);
317 type_decl = TYPE_STUB_DECL (type);
319 if (criterion == DINFO_STRUCT_FILE_SYS && DECL_IN_SYSTEM_HEADER (type_decl))
320 return DUMP_GSTRUCT (type, usage, criterion, generic, false, true);
322 if (matches_main_base (DECL_SOURCE_FILE (type_decl)))
323 return DUMP_GSTRUCT (type, usage, criterion, generic, true, true);
324 return DUMP_GSTRUCT (type, usage, criterion, generic, false, false);
327 /* Nonzero means use GNU-only extensions in the generated symbolic
328 debugging information. Currently, this only has an effect when
329 write_symbols is set to DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG. */
330 bool use_gnu_debug_info_extensions;
332 /* The default visibility for all symbols (unless overridden) */
333 enum symbol_visibility default_visibility = VISIBILITY_DEFAULT;
335 /* Global visibility options. */
336 struct visibility_flags visibility_options;
338 /* What to print when a switch has no documentation. */
339 static const char undocumented_msg[] = N_("This switch lacks documentation");
341 /* Functions excluded from profiling. */
343 typedef char *char_p; /* For DEF_VEC_P. */
345 DEF_VEC_ALLOC_P(char_p,heap);
347 static VEC(char_p,heap) *flag_instrument_functions_exclude_functions;
348 static VEC(char_p,heap) *flag_instrument_functions_exclude_files;
350 typedef const char *const_char_p; /* For DEF_VEC_P. */
351 DEF_VEC_P(const_char_p);
352 DEF_VEC_ALLOC_P(const_char_p,heap);
354 static VEC(const_char_p,heap) *ignored_options;
356 /* Input file names. */
357 const char **in_fnames;
358 unsigned num_in_fnames;
360 static bool common_handle_option (struct gcc_options *opts,
361 struct gcc_options *opts_set,
362 const struct cl_decoded_option *decoded,
363 unsigned int lang_mask, int kind,
364 const struct cl_option_handlers *handlers);
365 static void handle_param (struct gcc_options *opts,
366 struct gcc_options *opts_set, const char *carg);
367 static char *write_langs (unsigned int lang_mask);
368 static void complain_wrong_lang (const struct cl_decoded_option *,
369 unsigned int lang_mask);
370 static void set_debug_level (enum debug_info_type type, int extended,
372 static void set_fast_math_flags (int set);
373 static void set_unsafe_math_optimizations_flags (int set);
375 /* Return a malloced slash-separated list of languages in MASK. */
377 write_langs (unsigned int mask)
379 unsigned int n = 0, len = 0;
380 const char *lang_name;
383 for (n = 0; (lang_name = lang_names[n]) != 0; n++)
384 if (mask & (1U << n))
385 len += strlen (lang_name) + 1;
387 result = XNEWVEC (char, len);
389 for (n = 0; (lang_name = lang_names[n]) != 0; n++)
390 if (mask & (1U << n))
394 strcpy (result + len, lang_name);
395 len += strlen (lang_name);
403 /* Complain that switch DECODED does not apply to this front end (mask
406 complain_wrong_lang (const struct cl_decoded_option *decoded,
407 unsigned int lang_mask)
409 const struct cl_option *option = &cl_options[decoded->opt_index];
410 const char *text = decoded->orig_option_with_args_text;
411 char *ok_langs = NULL, *bad_lang = NULL;
412 unsigned int opt_flags = option->flags;
414 if (!lang_hooks.complain_wrong_lang_p (option))
417 opt_flags &= ((1U << cl_lang_count) - 1) | CL_DRIVER;
418 if (opt_flags != CL_DRIVER)
419 ok_langs = write_langs (opt_flags);
420 if (lang_mask != CL_DRIVER)
421 bad_lang = write_langs (lang_mask);
423 if (opt_flags == CL_DRIVER)
424 error ("command line option %qs is valid for the driver but not for %s",
426 else if (lang_mask == CL_DRIVER)
429 /* Eventually this should become a hard error IMO. */
430 warning (0, "command line option %qs is valid for %s but not for %s",
431 text, ok_langs, bad_lang);
437 /* Buffer the unknown option described by the string OPT. Currently,
438 we only complain about unknown -Wno-* options if they may have
439 prevented a diagnostic. Otherwise, we just ignore them.
440 Note that if we do complain, it is only as a warning, not an error;
441 passing the compiler an unrecognised -Wno-* option should never
442 change whether the compilation succeeds or fails. */
444 static void postpone_unknown_option_warning(const char *opt)
446 VEC_safe_push (const_char_p, heap, ignored_options, opt);
449 /* Produce a warning for each option previously buffered. */
451 void print_ignored_options (void)
453 location_t saved_loc = input_location;
457 while (!VEC_empty (const_char_p, ignored_options))
460 opt = VEC_pop (const_char_p, ignored_options);
461 warning (0, "unrecognized command line option \"%s\"", opt);
464 input_location = saved_loc;
467 /* Handle an unknown option DECODED, returning true if an error should be
471 unknown_option_callback (const struct cl_decoded_option *decoded)
473 const char *opt = decoded->arg;
475 if (opt[1] == 'W' && opt[2] == 'n' && opt[3] == 'o' && opt[4] == '-'
476 && !(decoded->errors & CL_ERR_NEGATIVE))
478 /* We don't generate warnings for unknown -Wno-* options unless
479 we issue diagnostics. */
480 postpone_unknown_option_warning (opt);
487 /* Note that an option DECODED has been successfully handled with a
488 handler for mask MASK. */
491 post_handling_callback (const struct cl_decoded_option *decoded ATTRIBUTE_UNUSED,
492 unsigned int mask ATTRIBUTE_UNUSED)
495 lto_register_user_option (decoded->opt_index, decoded->arg,
496 decoded->value, mask);
500 /* Handle a front-end option; arguments and return value as for
504 lang_handle_option (struct gcc_options *opts,
505 struct gcc_options *opts_set,
506 const struct cl_decoded_option *decoded,
507 unsigned int lang_mask ATTRIBUTE_UNUSED, int kind,
508 const struct cl_option_handlers *handlers)
510 gcc_assert (opts == &global_options);
511 gcc_assert (opts_set == &global_options_set);
512 gcc_assert (decoded->canonical_option_num_elements <= 2);
513 return lang_hooks.handle_option (decoded->opt_index, decoded->arg,
514 decoded->value, kind, handlers);
517 /* Handle a back-end option; arguments and return value as for
521 target_handle_option (struct gcc_options *opts,
522 struct gcc_options *opts_set,
523 const struct cl_decoded_option *decoded,
524 unsigned int lang_mask ATTRIBUTE_UNUSED, int kind,
525 const struct cl_option_handlers *handlers ATTRIBUTE_UNUSED)
527 gcc_assert (opts == &global_options);
528 gcc_assert (opts_set == &global_options_set);
529 gcc_assert (decoded->canonical_option_num_elements <= 2);
530 gcc_assert (kind == DK_UNSPECIFIED);
531 return targetm.handle_option (decoded->opt_index, decoded->arg,
535 /* Handle FILENAME from the command line. */
537 add_input_filename (const char *filename)
540 in_fnames = XRESIZEVEC (const char *, in_fnames, num_in_fnames);
541 in_fnames[num_in_fnames - 1] = filename;
544 /* Add comma-separated strings to a char_p vector. */
547 add_comma_separated_to_vector (VEC(char_p,heap) **pvec, const char* arg)
554 /* We never free this string. */
567 VEC_safe_push (char_p, heap, *pvec, token_start);
570 if (*r == '\\' && r[1] == ',')
578 if (*token_start != '\0')
579 VEC_safe_push (char_p, heap, *pvec, token_start);
582 /* Return whether we should exclude FNDECL from instrumentation. */
585 flag_instrument_functions_exclude_p (tree fndecl)
587 if (VEC_length (char_p, flag_instrument_functions_exclude_functions) > 0)
593 name = lang_hooks.decl_printable_name (fndecl, 0);
594 FOR_EACH_VEC_ELT (char_p, flag_instrument_functions_exclude_functions,
596 if (strstr (name, s) != NULL)
600 if (VEC_length (char_p, flag_instrument_functions_exclude_files) > 0)
606 name = DECL_SOURCE_FILE (fndecl);
607 FOR_EACH_VEC_ELT (char_p, flag_instrument_functions_exclude_files, i, s)
608 if (strstr (name, s) != NULL)
616 /* Handle the vector of command line options, storing the results of
617 processing DECODED_OPTIONS and DECODED_OPTIONS_COUNT in OPTS and
618 OPTS_SET. LANG_MASK contains has a single bit set representing the
619 current language. HANDLERS describes what functions to call for
622 read_cmdline_options (struct gcc_options *opts, struct gcc_options *opts_set,
623 struct cl_decoded_option *decoded_options,
624 unsigned int decoded_options_count,
625 unsigned int lang_mask,
626 const struct cl_option_handlers *handlers)
630 for (i = 1; i < decoded_options_count; i++)
632 if (decoded_options[i].opt_index == OPT_SPECIAL_input_file)
634 /* Input files should only ever appear on the main command
636 gcc_assert (opts == &global_options);
637 gcc_assert (opts_set == &global_options_set);
639 if (main_input_filename == NULL)
641 main_input_filename = decoded_options[i].arg;
642 main_input_baselength
643 = base_of_path (main_input_filename, &main_input_basename);
645 add_input_filename (decoded_options[i].arg);
649 read_cmdline_option (opts, opts_set,
650 decoded_options + i, lang_mask, handlers,
655 /* Language mask determined at initialization. */
656 static unsigned int initial_lang_mask;
658 /* Initialize global options-related settings at start-up. */
661 init_options_once (void)
663 /* Perform language-specific options initialization. */
664 initial_lang_mask = lang_hooks.option_lang_mask ();
666 lang_hooks.initialize_diagnostics (global_dc);
669 /* Initialize OPTS and OPTS_SET before using them in parsing options. */
672 init_options_struct (struct gcc_options *opts, struct gcc_options *opts_set)
674 size_t num_params = get_num_compiler_params ();
676 *opts = global_options_init;
677 memset (opts_set, 0, sizeof (*opts_set));
679 opts->x_param_values = XNEWVEC (int, num_params);
680 opts_set->x_param_values = XCNEWVEC (int, num_params);
681 init_param_values (opts->x_param_values);
683 /* Use priority coloring if cover classes is not defined for the
685 if (targetm.ira_cover_classes == NULL)
686 opts->x_flag_ira_algorithm = IRA_ALGORITHM_PRIORITY;
688 /* Initialize whether `char' is signed. */
689 opts->x_flag_signed_char = DEFAULT_SIGNED_CHAR;
690 /* Set this to a special "uninitialized" value. The actual default
691 is set after target options have been processed. */
692 opts->x_flag_short_enums = 2;
694 /* Initialize target_flags before targetm.target_option.optimization
695 so the latter can modify it. */
696 opts->x_target_flags = targetm.default_target_flags;
698 /* Some targets have ABI-specified unwind tables. */
699 opts->x_flag_unwind_tables = targetm.unwind_tables_default;
701 /* Some targets have other target-specific initialization. */
702 targetm.target_option.init_struct (opts);
705 /* Decode command-line options to an array, like
706 decode_cmdline_options_to_array and with the same arguments but
707 using the default lang_mask. */
710 decode_cmdline_options_to_array_default_mask (unsigned int argc,
712 struct cl_decoded_option **decoded_options,
713 unsigned int *decoded_options_count)
715 decode_cmdline_options_to_array (argc, argv,
716 initial_lang_mask | CL_COMMON | CL_TARGET,
717 decoded_options, decoded_options_count);
720 /* Default the options in OPTS and OPTS_SET based on the optimization
721 settings in DECODED_OPTIONS and DECODED_OPTIONS_COUNT. */
723 default_options_optimization (struct gcc_options *opts,
724 struct gcc_options *opts_set,
725 struct cl_decoded_option *decoded_options,
726 unsigned int decoded_options_count)
735 gcc_assert (opts == &global_options);
736 gcc_assert (opts_set = &global_options_set);
738 /* Scan to see what optimization level has been specified. That will
739 determine the default value of many flags. */
740 for (i = 1; i < decoded_options_count; i++)
742 struct cl_decoded_option *opt = &decoded_options[i];
743 switch (opt->opt_index)
746 if (*opt->arg == '\0')
754 const int optimize_val = integral_argument (opt->arg);
755 if (optimize_val == -1)
756 error ("argument to %qs should be a non-negative integer",
760 optimize = optimize_val;
761 if ((unsigned int) optimize > 255)
772 /* Optimizing for size forces optimize to be 2. */
778 /* -Ofast only adds flags to -O3. */
785 /* Ignore other options in this prescan. */
790 /* -O1 optimizations. */
791 opt1 = (optimize >= 1);
792 flag_defer_pop = opt1;
794 flag_delayed_branch = opt1;
796 #ifdef CAN_DEBUG_WITHOUT_FP
797 flag_omit_frame_pointer = opt1;
799 flag_guess_branch_prob = opt1;
800 flag_cprop_registers = opt1;
801 flag_forward_propagate = opt1;
802 flag_if_conversion = opt1;
803 flag_if_conversion2 = opt1;
804 flag_ipa_pure_const = opt1;
805 flag_ipa_reference = opt1;
806 flag_ipa_profile = opt1;
807 flag_merge_constants = opt1;
808 flag_split_wide_types = opt1;
809 flag_tree_ccp = opt1;
810 flag_tree_bit_ccp = opt1;
811 flag_tree_dce = opt1;
812 flag_tree_dom = opt1;
813 flag_tree_dse = opt1;
814 flag_tree_ter = opt1;
815 flag_tree_sra = opt1;
816 flag_tree_copyrename = opt1;
817 flag_tree_fre = opt1;
818 flag_tree_copy_prop = opt1;
819 flag_tree_sink = opt1;
821 flag_combine_stack_adjustments = opt1;
823 /* -O2 optimizations. */
824 opt2 = (optimize >= 2);
825 flag_inline_small_functions = opt2;
826 flag_indirect_inlining = opt2;
827 flag_partial_inlining = opt2;
828 flag_thread_jumps = opt2;
829 flag_crossjumping = opt2;
830 flag_optimize_sibling_calls = opt2;
831 flag_cse_follow_jumps = opt2;
833 flag_expensive_optimizations = opt2;
834 flag_rerun_cse_after_loop = opt2;
835 flag_caller_saves = opt2;
836 flag_peephole2 = opt2;
837 #ifdef INSN_SCHEDULING
838 /* Only run the pre-regalloc scheduling pass if optimizing for speed. */
839 flag_schedule_insns = opt2 && ! optimize_size;
840 flag_schedule_insns_after_reload = opt2;
843 flag_strict_aliasing = opt2;
844 flag_strict_overflow = opt2;
845 flag_reorder_blocks = opt2;
846 flag_reorder_functions = opt2;
847 flag_tree_vrp = opt2;
848 flag_tree_builtin_call_dce = opt2;
849 flag_tree_pre = opt2;
850 flag_tree_switch_conversion = opt2;
854 /* Track fields in field-sensitive alias analysis. */
855 maybe_set_param_value
856 (PARAM_MAX_FIELDS_FOR_FIELD_SENSITIVE,
857 opt2 ? 100 : default_param_value (PARAM_MAX_FIELDS_FOR_FIELD_SENSITIVE),
858 opts->x_param_values, opts_set->x_param_values);
860 /* For -O1 only do loop invariant motion for very small loops. */
861 maybe_set_param_value
862 (PARAM_LOOP_INVARIANT_MAX_BBS_IN_LOOP,
863 opt2 ? default_param_value (PARAM_LOOP_INVARIANT_MAX_BBS_IN_LOOP) : 1000,
864 opts->x_param_values, opts_set->x_param_values);
866 /* -O3 optimizations. */
867 opt3 = (optimize >= 3);
868 flag_tree_loop_distribute_patterns = opt3;
869 flag_predictive_commoning = opt3;
870 flag_inline_functions = opt3;
871 flag_unswitch_loops = opt3;
872 flag_gcse_after_reload = opt3;
873 flag_tree_vectorize = opt3;
874 flag_ipa_cp_clone = opt3;
875 if (flag_ipa_cp_clone)
878 /* Just -O1/-O0 optimizations. */
879 opt1_max = (optimize <= 1);
880 align_loops = opt1_max;
881 align_jumps = opt1_max;
882 align_labels = opt1_max;
883 align_functions = opt1_max;
887 /* Inlining of functions reducing size is a good idea regardless of them
888 being declared inline. */
889 flag_inline_functions = 1;
891 /* Basic optimization options. */
896 /* We want to crossjump as much as possible. */
897 maybe_set_param_value (PARAM_MIN_CROSSJUMP_INSNS, 1,
898 opts->x_param_values, opts_set->x_param_values);
901 maybe_set_param_value (PARAM_MIN_CROSSJUMP_INSNS,
902 default_param_value (PARAM_MIN_CROSSJUMP_INSNS),
903 opts->x_param_values, opts_set->x_param_values);
905 /* -Ofast adds optimizations to -O3. */
908 /* Which is -ffast-math for now. */
909 set_fast_math_flags (1);
910 /* Allow targets to enable extra options with -Ofast
911 before general options processing so disabling them
912 again afterwards works. */
913 targetm.handle_ofast ();
916 /* Allow default optimizations to be specified on a per-machine basis. */
917 targetm.target_option.optimization (optimize, optimize_size);
920 static void finish_options (struct gcc_options *, struct gcc_options *);
922 /* Parse command line options and set default flag values. Do minimal
923 options processing. The decoded options are in *DECODED_OPTIONS
924 and *DECODED_OPTIONS_COUNT. */
926 decode_options (struct gcc_options *opts, struct gcc_options *opts_set,
927 struct cl_decoded_option *decoded_options,
928 unsigned int decoded_options_count)
930 struct cl_option_handlers handlers;
932 unsigned int lang_mask;
934 lang_mask = initial_lang_mask;
936 handlers.unknown_option_callback = unknown_option_callback;
937 handlers.wrong_lang_callback = complain_wrong_lang;
938 handlers.post_handling_callback = post_handling_callback;
939 handlers.num_handlers = 3;
940 handlers.handlers[0].handler = lang_handle_option;
941 handlers.handlers[0].mask = lang_mask;
942 handlers.handlers[1].handler = common_handle_option;
943 handlers.handlers[1].mask = CL_COMMON;
944 handlers.handlers[2].handler = target_handle_option;
945 handlers.handlers[2].mask = CL_TARGET;
947 /* Enable -Werror=coverage-mismatch by default */
948 enable_warning_as_error ("coverage-mismatch", 1, lang_mask, &handlers,
951 default_options_optimization (opts, opts_set,
952 decoded_options, decoded_options_count);
955 /* Clear any options currently held for LTO. */
956 lto_clear_user_options ();
959 read_cmdline_options (opts, opts_set,
960 decoded_options, decoded_options_count, lang_mask,
963 finish_options (opts, opts_set);
966 /* After all options have been read into OPTS and OPTS_SET, finalize
967 settings of those options and diagnose incompatible
970 finish_options (struct gcc_options *opts, struct gcc_options *opts_set)
972 static bool first_time_p = true;
973 enum unwind_info_type ui_except;
975 gcc_assert (opts == &global_options);
976 gcc_assert (opts_set = &global_options_set);
978 if (dump_base_name && ! IS_ABSOLUTE_PATH (dump_base_name))
980 /* First try to make DUMP_BASE_NAME relative to the DUMP_DIR_NAME
981 directory. Then try to make DUMP_BASE_NAME relative to the
982 AUX_BASE_NAME directory, typically the directory to contain
985 dump_base_name = concat (dump_dir_name, dump_base_name, NULL);
986 else if (aux_base_name)
988 const char *aux_base;
990 base_of_path (aux_base_name, &aux_base);
991 if (aux_base_name != aux_base)
993 int dir_len = aux_base - aux_base_name;
994 char *new_dump_base_name =
995 XNEWVEC (char, strlen(dump_base_name) + dir_len + 1);
997 /* Copy directory component from AUX_BASE_NAME. */
998 memcpy (new_dump_base_name, aux_base_name, dir_len);
999 /* Append existing DUMP_BASE_NAME. */
1000 strcpy (new_dump_base_name + dir_len, dump_base_name);
1001 dump_base_name = new_dump_base_name;
1006 /* Handle related options for unit-at-a-time, toplevel-reorder, and
1008 if (!flag_unit_at_a_time)
1010 if (flag_section_anchors && opts_set->x_flag_section_anchors)
1011 error ("Section anchors must be disabled when unit-at-a-time "
1013 flag_section_anchors = 0;
1014 if (flag_toplevel_reorder == 1)
1015 error ("Toplevel reorder must be disabled when unit-at-a-time "
1017 flag_toplevel_reorder = 0;
1020 /* -Wmissing-noreturn is alias for -Wsuggest-attribute=noreturn. */
1021 if (warn_missing_noreturn)
1022 warn_suggest_attribute_noreturn = true;
1024 /* Unless the user has asked for section anchors, we disable toplevel
1025 reordering at -O0 to disable transformations that might be surprising
1026 to end users and to get -fno-toplevel-reorder tested. */
1028 && flag_toplevel_reorder == 2
1029 && !(flag_section_anchors && opts_set->x_flag_section_anchors))
1031 flag_toplevel_reorder = 0;
1032 flag_section_anchors = 0;
1034 if (!flag_toplevel_reorder)
1036 if (flag_section_anchors && opts_set->x_flag_section_anchors)
1037 error ("section anchors must be disabled when toplevel reorder"
1039 flag_section_anchors = 0;
1045 flag_pic = flag_pie;
1046 if (flag_pic && !flag_pie)
1048 first_time_p = false;
1053 /* Inlining does not work if not optimizing,
1054 so force it not to be done. */
1059 /* The optimization to partition hot and cold basic blocks into separate
1060 sections of the .o and executable files does not work (currently)
1061 with exception handling. This is because there is no support for
1062 generating unwind info. If flag_exceptions is turned on we need to
1063 turn off the partitioning optimization. */
1065 ui_except = targetm.except_unwind_info ();
1068 && flag_reorder_blocks_and_partition
1069 && (ui_except == UI_SJLJ || ui_except == UI_TARGET))
1071 inform (input_location,
1072 "-freorder-blocks-and-partition does not work "
1073 "with exceptions on this architecture");
1074 flag_reorder_blocks_and_partition = 0;
1075 flag_reorder_blocks = 1;
1078 /* If user requested unwind info, then turn off the partitioning
1081 if (flag_unwind_tables
1082 && !targetm.unwind_tables_default
1083 && flag_reorder_blocks_and_partition
1084 && (ui_except == UI_SJLJ || ui_except == UI_TARGET))
1086 inform (input_location,
1087 "-freorder-blocks-and-partition does not support "
1088 "unwind info on this architecture");
1089 flag_reorder_blocks_and_partition = 0;
1090 flag_reorder_blocks = 1;
1093 /* If the target requested unwind info, then turn off the partitioning
1094 optimization with a different message. Likewise, if the target does not
1095 support named sections. */
1097 if (flag_reorder_blocks_and_partition
1098 && (!targetm.have_named_sections
1099 || (flag_unwind_tables
1100 && targetm.unwind_tables_default
1101 && (ui_except == UI_SJLJ || ui_except == UI_TARGET))))
1103 inform (input_location,
1104 "-freorder-blocks-and-partition does not work "
1105 "on this architecture");
1106 flag_reorder_blocks_and_partition = 0;
1107 flag_reorder_blocks = 1;
1110 /* Pipelining of outer loops is only possible when general pipelining
1111 capabilities are requested. */
1112 if (!flag_sel_sched_pipelining)
1113 flag_sel_sched_pipelining_outer_loops = 0;
1115 if (!targetm.ira_cover_classes
1116 && flag_ira_algorithm == IRA_ALGORITHM_CB)
1118 inform (input_location,
1119 "-fira-algorithm=CB does not work on this architecture");
1120 flag_ira_algorithm = IRA_ALGORITHM_PRIORITY;
1123 if (flag_conserve_stack)
1125 maybe_set_param_value (PARAM_LARGE_STACK_FRAME, 100,
1126 opts->x_param_values, opts_set->x_param_values);
1127 maybe_set_param_value (PARAM_STACK_FRAME_GROWTH, 40,
1128 opts->x_param_values, opts_set->x_param_values);
1130 if (flag_wpa || flag_ltrans)
1132 /* These passes are not WHOPR compatible yet. */
1134 flag_ipa_struct_reorg = 0;
1137 if (flag_lto || flag_whopr)
1140 flag_generate_lto = 1;
1142 /* When generating IL, do not operate in whole-program mode.
1143 Otherwise, symbols will be privatized too early, causing link
1145 flag_whole_program = 0;
1147 error ("LTO support has not been enabled in this configuration");
1150 if (flag_lto_partition_balanced || flag_lto_partition_1to1)
1152 if (flag_lto_partition_balanced && flag_lto_partition_1to1)
1153 error ("Only one -flto-partitoin value can be specified");
1155 error ("-flto-partitoin has effect only with -fwhopr");
1158 /* Reconcile -flto and -fwhopr. Set additional flags as appropriate and
1159 check option consistency. */
1160 if (flag_lto && flag_whopr)
1161 error ("-flto and -fwhopr are mutually exclusive");
1163 /* We initialize flag_split_stack to -1 so that targets can set a
1164 default value if they choose based on other options. */
1165 if (flag_split_stack == -1)
1166 flag_split_stack = 0;
1167 else if (flag_split_stack)
1169 if (!targetm.supports_split_stack (true))
1171 error ("%<-fsplit-stack%> is not supported by "
1172 "this compiler configuration");
1173 flag_split_stack = 0;
1178 #define LEFT_COLUMN 27
1180 /* Output ITEM, of length ITEM_WIDTH, in the left column,
1181 followed by word-wrapped HELP in a second column. */
1183 wrap_help (const char *help,
1185 unsigned int item_width,
1186 unsigned int columns)
1188 unsigned int col_width = LEFT_COLUMN;
1189 unsigned int remaining, room, len;
1191 remaining = strlen (help);
1195 room = columns - 3 - MAX (col_width, item_width);
1204 for (i = 0; help[i]; i++)
1206 if (i >= room && len != remaining)
1210 else if ((help[i] == '-' || help[i] == '/')
1211 && help[i + 1] != ' '
1212 && i > 0 && ISALPHA (help[i - 1]))
1217 printf( " %-*.*s %.*s\n", col_width, item_width, item, len, help);
1219 while (help[len] == ' ')
1227 /* Print help for a specific front-end, etc. */
1229 print_filtered_help (unsigned int include_flags,
1230 unsigned int exclude_flags,
1231 unsigned int any_flags,
1232 unsigned int columns)
1236 static char *printed = NULL;
1238 bool displayed = false;
1240 if (include_flags == CL_PARAMS)
1242 for (i = 0; i < LAST_PARAM; i++)
1244 const char *param = compiler_params[i].option;
1246 help = compiler_params[i].help;
1247 if (help == NULL || *help == '\0')
1249 if (exclude_flags & CL_UNDOCUMENTED)
1251 help = undocumented_msg;
1254 /* Get the translation. */
1257 wrap_help (help, param, strlen (param), columns);
1264 printed = XCNEWVAR (char, cl_options_count);
1266 for (i = 0; i < cl_options_count; i++)
1268 static char new_help[128];
1269 const struct cl_option *option = cl_options + i;
1274 if (include_flags == 0
1275 || ((option->flags & include_flags) != include_flags))
1277 if ((option->flags & any_flags) == 0)
1281 /* Skip unwanted switches. */
1282 if ((option->flags & exclude_flags) != 0)
1285 /* The driver currently prints its own help text. */
1286 if ((option->flags & CL_DRIVER) != 0
1287 && (option->flags & (((1U << cl_lang_count) - 1)
1288 | CL_COMMON | CL_TARGET)) == 0)
1292 /* Skip switches that have already been printed. */
1298 help = option->help;
1301 if (exclude_flags & CL_UNDOCUMENTED)
1303 help = undocumented_msg;
1306 /* Get the translation. */
1309 /* Find the gap between the name of the
1310 option and its descriptive text. */
1311 tab = strchr (help, '\t');
1320 opt = option->opt_text;
1324 /* With the -Q option enabled we change the descriptive text associated
1325 with an option to be an indication of its current setting. */
1328 void *flag_var = option_flag_var (i, &global_options);
1330 if (len < (LEFT_COLUMN + 2))
1331 strcpy (new_help, "\t\t");
1333 strcpy (new_help, "\t");
1335 if (flag_var != NULL)
1337 if (option->flags & CL_JOINED)
1339 if (option->var_type == CLVC_STRING)
1341 if (* (const char **) flag_var != NULL)
1342 snprintf (new_help + strlen (new_help),
1343 sizeof (new_help) - strlen (new_help),
1344 * (const char **) flag_var);
1347 sprintf (new_help + strlen (new_help),
1348 "%#x", * (int *) flag_var);
1351 strcat (new_help, option_enabled (i, &global_options)
1352 ? _("[enabled]") : _("[disabled]"));
1358 wrap_help (help, opt, len, columns);
1364 unsigned int langs = include_flags & CL_LANG_ALL;
1367 printf (_(" No options with the desired characteristics were found\n"));
1372 /* PR 31349: Tell the user how to see all of the
1373 options supported by a specific front end. */
1374 for (i = 0; (1U << i) < CL_LANG_ALL; i ++)
1375 if ((1U << i) & langs)
1376 printf (_(" None found. Use --help=%s to show *all* the options supported by the %s front-end\n"),
1377 lang_names[i], lang_names[i]);
1381 else if (! displayed)
1382 printf (_(" All options with the desired characteristics have already been displayed\n"));
1387 /* Display help for a specified type of option.
1388 The options must have ALL of the INCLUDE_FLAGS set
1389 ANY of the flags in the ANY_FLAGS set
1390 and NONE of the EXCLUDE_FLAGS set. */
1392 print_specific_help (unsigned int include_flags,
1393 unsigned int exclude_flags,
1394 unsigned int any_flags)
1396 unsigned int all_langs_mask = (1U << cl_lang_count) - 1;
1397 const char * description = NULL;
1398 const char * descrip_extra = "";
1401 static unsigned int columns = 0;
1403 /* Sanity check: Make sure that we do not have more
1404 languages than we have bits available to enumerate them. */
1405 gcc_assert ((1U << cl_lang_count) < CL_MIN_OPTION_CLASS);
1407 /* If we have not done so already, obtain
1408 the desired maximum width of the output. */
1413 GET_ENVIRONMENT (p, "COLUMNS");
1416 int value = atoi (p);
1423 /* Use a reasonable default. */
1427 /* Decide upon the title for the options that we are going to display. */
1428 for (i = 0, flag = 1; flag <= CL_MAX_OPTION_CLASS; flag <<= 1, i ++)
1430 switch (flag & include_flags)
1437 description = _("The following options are target specific");
1440 description = _("The following options control compiler warning messages");
1442 case CL_OPTIMIZATION:
1443 description = _("The following options control optimizations");
1446 description = _("The following options are language-independent");
1449 description = _("The --param option recognizes the following as parameters");
1452 if (i >= cl_lang_count)
1454 if (exclude_flags & all_langs_mask)
1455 description = _("The following options are specific to just the language ");
1457 description = _("The following options are supported by the language ");
1458 descrip_extra = lang_names [i];
1463 if (description == NULL)
1467 if (include_flags & CL_UNDOCUMENTED)
1468 description = _("The following options are not documented");
1469 else if (include_flags & CL_SEPARATE)
1470 description = _("The following options take separate arguments");
1471 else if (include_flags & CL_JOINED)
1472 description = _("The following options take joined arguments");
1475 internal_error ("unrecognized include_flags 0x%x passed to print_specific_help",
1482 if (any_flags & all_langs_mask)
1483 description = _("The following options are language-related");
1485 description = _("The following options are language-independent");
1489 printf ("%s%s:\n", description, descrip_extra);
1490 print_filtered_help (include_flags, exclude_flags, any_flags, columns);
1493 /* Handle target- and language-independent options. Return zero to
1494 generate an "unknown option" message. Only options that need
1495 extra handling need to be listed here; if you simply want
1496 DECODED->value assigned to a variable, it happens automatically. */
1499 common_handle_option (struct gcc_options *opts,
1500 struct gcc_options *opts_set,
1501 const struct cl_decoded_option *decoded,
1502 unsigned int lang_mask, int kind ATTRIBUTE_UNUSED,
1503 const struct cl_option_handlers *handlers)
1505 size_t scode = decoded->opt_index;
1506 const char *arg = decoded->arg;
1507 int value = decoded->value;
1508 static bool verbose = false;
1509 enum opt_code code = (enum opt_code) scode;
1511 gcc_assert (opts == &global_options);
1512 gcc_assert (opts_set == &global_options_set);
1513 gcc_assert (decoded->canonical_option_num_elements <= 2);
1518 handle_param (opts, opts_set, arg);
1527 unsigned int all_langs_mask = (1U << cl_lang_count) - 1;
1528 unsigned int undoc_mask;
1531 undoc_mask = (verbose | extra_warnings) ? 0 : CL_UNDOCUMENTED;
1532 /* First display any single language specific options. */
1533 for (i = 0; i < cl_lang_count; i++)
1535 (1U << i, (all_langs_mask & (~ (1U << i))) | undoc_mask, 0);
1536 /* Next display any multi language specific options. */
1537 print_specific_help (0, undoc_mask, all_langs_mask);
1538 /* Then display any remaining, non-language options. */
1539 for (i = CL_MIN_OPTION_CLASS; i <= CL_MAX_OPTION_CLASS; i <<= 1)
1541 print_specific_help (i, undoc_mask, 0);
1542 exit_after_options = true;
1546 case OPT__target_help:
1547 print_specific_help (CL_TARGET, CL_UNDOCUMENTED, 0);
1548 exit_after_options = true;
1550 /* Allow the target a chance to give the user some additional information. */
1557 const char * a = arg;
1558 unsigned int include_flags = 0;
1559 /* Note - by default we include undocumented options when listing
1560 specific classes. If you only want to see documented options
1561 then add ",^undocumented" to the --help= option. E.g.:
1563 --help=target,^undocumented */
1564 unsigned int exclude_flags = 0;
1566 /* Walk along the argument string, parsing each word in turn.
1568 arg = [^]{word}[,{arg}]
1569 word = {optimizers|target|warnings|undocumented|
1570 params|common|<language>} */
1575 const char * string;
1580 { "optimizers", CL_OPTIMIZATION },
1581 { "target", CL_TARGET },
1582 { "warnings", CL_WARNING },
1583 { "undocumented", CL_UNDOCUMENTED },
1584 { "params", CL_PARAMS },
1585 { "joined", CL_JOINED },
1586 { "separate", CL_SEPARATE },
1587 { "common", CL_COMMON },
1590 unsigned int * pflags;
1592 unsigned int lang_flag, specific_flag;
1599 pflags = & exclude_flags;
1602 pflags = & include_flags;
1604 comma = strchr (a, ',');
1615 /* Check to see if the string matches an option class name. */
1616 for (i = 0, specific_flag = 0; specifics[i].string != NULL; i++)
1617 if (strncasecmp (a, specifics[i].string, len) == 0)
1619 specific_flag = specifics[i].flag;
1623 /* Check to see if the string matches a language name.
1624 Note - we rely upon the alpha-sorted nature of the entries in
1625 the lang_names array, specifically that shorter names appear
1626 before their longer variants. (i.e. C before C++). That way
1627 when we are attempting to match --help=c for example we will
1628 match with C first and not C++. */
1629 for (i = 0, lang_flag = 0; i < cl_lang_count; i++)
1630 if (strncasecmp (a, lang_names[i], len) == 0)
1632 lang_flag = 1U << i;
1636 if (specific_flag != 0)
1639 * pflags |= specific_flag;
1642 /* The option's argument matches both the start of a
1643 language name and the start of an option class name.
1644 We have a special case for when the user has
1645 specified "--help=c", but otherwise we have to issue
1647 if (strncasecmp (a, "c", len) == 0)
1648 * pflags |= lang_flag;
1651 "warning: --help argument %.*s is ambiguous, please be more specific\n",
1655 else if (lang_flag != 0)
1656 * pflags |= lang_flag;
1659 "warning: unrecognized argument to --help= option: %.*s\n",
1668 print_specific_help (include_flags, exclude_flags, 0);
1669 exit_after_options = true;
1674 exit_after_options = true;
1680 /* Currently handled in a prescan. */
1684 enable_warning_as_error (arg, value, lang_mask, handlers, global_dc);
1687 case OPT_Wlarger_than_:
1688 larger_than_size = value;
1689 warn_larger_than = value != -1;
1692 case OPT_Wfatal_errors:
1693 global_dc->fatal_errors = value;
1696 case OPT_Wframe_larger_than_:
1697 frame_larger_than_size = value;
1698 warn_frame_larger_than = value != -1;
1701 case OPT_Wstrict_aliasing:
1702 set_Wstrict_aliasing (value);
1705 case OPT_Wstrict_aliasing_:
1706 warn_strict_aliasing = value;
1709 case OPT_Wstrict_overflow:
1710 warn_strict_overflow = (value
1711 ? (int) WARN_STRICT_OVERFLOW_CONDITIONAL
1715 case OPT_Wstrict_overflow_:
1716 warn_strict_overflow = value;
1719 case OPT_Wsystem_headers:
1720 global_dc->dc_warn_system_headers = value;
1724 warn_unused = value;
1728 aux_info_file_name = arg;
1729 flag_gen_aux_info = 1;
1733 aux_base_name = arg;
1736 case OPT_auxbase_strip:
1738 char *tmp = xstrdup (arg);
1739 strip_off_ending (tmp, strlen (tmp));
1741 aux_base_name = tmp;
1746 decode_d_option (arg);
1750 dump_base_name = arg;
1754 dump_dir_name = arg;
1757 case OPT_falign_functions_:
1758 align_functions = value;
1761 case OPT_falign_jumps_:
1762 align_jumps = value;
1765 case OPT_falign_labels_:
1766 align_labels = value;
1769 case OPT_falign_loops_:
1770 align_loops = value;
1773 case OPT_fcall_used_:
1774 fix_register (arg, 0, 1);
1777 case OPT_fcall_saved_:
1778 fix_register (arg, 0, 0);
1781 case OPT_fcompare_debug_second:
1782 flag_compare_debug = value;
1786 dbg_cnt_process_opt (arg);
1789 case OPT_fdbg_cnt_list:
1790 dbg_cnt_list_all_counters ();
1793 case OPT_fdebug_prefix_map_:
1794 add_debug_prefix_map (arg);
1797 case OPT_fdiagnostics_show_location_:
1798 if (!strcmp (arg, "once"))
1799 diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
1800 else if (!strcmp (arg, "every-line"))
1801 diagnostic_prefixing_rule (global_dc)
1802 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE;
1807 case OPT_fdiagnostics_show_option:
1808 global_dc->show_option_requested = value;
1812 if (!dump_switch_p (arg))
1816 case OPT_fexcess_precision_:
1817 if (!strcmp (arg, "fast"))
1818 flag_excess_precision_cmdline = EXCESS_PRECISION_FAST;
1819 else if (!strcmp (arg, "standard"))
1820 flag_excess_precision_cmdline = EXCESS_PRECISION_STANDARD;
1822 error ("unknown excess precision style \"%s\"", arg);
1825 case OPT_ffast_math:
1826 set_fast_math_flags (value);
1829 case OPT_funsafe_math_optimizations:
1830 set_unsafe_math_optimizations_flags (value);
1834 fix_register (arg, 1, 1);
1837 case OPT_finline_limit_:
1838 set_param_value ("max-inline-insns-single", value / 2,
1839 opts->x_param_values, opts_set->x_param_values);
1840 set_param_value ("max-inline-insns-auto", value / 2,
1841 opts->x_param_values, opts_set->x_param_values);
1844 case OPT_finstrument_functions_exclude_function_list_:
1845 add_comma_separated_to_vector
1846 (&flag_instrument_functions_exclude_functions, arg);
1849 case OPT_finstrument_functions_exclude_file_list_:
1850 add_comma_separated_to_vector
1851 (&flag_instrument_functions_exclude_files, arg);
1854 case OPT_fmessage_length_:
1855 pp_set_line_maximum_length (global_dc->printer, value);
1858 case OPT_fpack_struct_:
1859 if (value <= 0 || (value & (value - 1)) || value > 16)
1860 error ("structure alignment must be a small power of two, not %d", value);
1863 initial_max_fld_align = value;
1864 maximum_field_alignment = value * BITS_PER_UNIT;
1869 #ifdef ENABLE_PLUGIN
1870 add_new_plugin (arg);
1872 error ("Plugin support is disabled. Configure with --enable-plugin.");
1876 case OPT_fplugin_arg_:
1877 #ifdef ENABLE_PLUGIN
1878 parse_plugin_arg_opt (arg);
1880 error ("Plugin support is disabled. Configure with --enable-plugin.");
1884 case OPT_fprofile_dir_:
1885 profile_data_prefix = xstrdup (arg);
1888 case OPT_fprofile_use_:
1889 profile_data_prefix = xstrdup (arg);
1890 flag_profile_use = true;
1892 /* No break here - do -fprofile-use processing. */
1893 case OPT_fprofile_use:
1894 if (!opts_set->x_flag_branch_probabilities)
1895 flag_branch_probabilities = value;
1896 if (!opts_set->x_flag_profile_values)
1897 flag_profile_values = value;
1898 if (!opts_set->x_flag_unroll_loops)
1899 flag_unroll_loops = value;
1900 if (!opts_set->x_flag_peel_loops)
1901 flag_peel_loops = value;
1902 if (!opts_set->x_flag_tracer)
1903 flag_tracer = value;
1904 if (!opts_set->x_flag_value_profile_transformations)
1905 flag_value_profile_transformations = value;
1906 if (!opts_set->x_flag_inline_functions)
1907 flag_inline_functions = value;
1908 if (!opts_set->x_flag_ipa_cp)
1909 flag_ipa_cp = value;
1910 if (!opts_set->x_flag_ipa_cp_clone
1911 && value && flag_ipa_cp)
1912 flag_ipa_cp_clone = value;
1913 if (!opts_set->x_flag_predictive_commoning)
1914 flag_predictive_commoning = value;
1915 if (!opts_set->x_flag_unswitch_loops)
1916 flag_unswitch_loops = value;
1917 if (!opts_set->x_flag_gcse_after_reload)
1918 flag_gcse_after_reload = value;
1921 case OPT_fprofile_generate_:
1922 profile_data_prefix = xstrdup (arg);
1924 /* No break here - do -fprofile-generate processing. */
1925 case OPT_fprofile_generate:
1926 if (!opts_set->x_profile_arc_flag)
1927 profile_arc_flag = value;
1928 if (!opts_set->x_flag_profile_values)
1929 flag_profile_values = value;
1930 if (!opts_set->x_flag_value_profile_transformations)
1931 flag_value_profile_transformations = value;
1932 if (!opts_set->x_flag_inline_functions)
1933 flag_inline_functions = value;
1936 case OPT_fshow_column:
1937 global_dc->show_column = value;
1940 case OPT_fvisibility_:
1942 if (!strcmp(arg, "default"))
1943 default_visibility = VISIBILITY_DEFAULT;
1944 else if (!strcmp(arg, "internal"))
1945 default_visibility = VISIBILITY_INTERNAL;
1946 else if (!strcmp(arg, "hidden"))
1947 default_visibility = VISIBILITY_HIDDEN;
1948 else if (!strcmp(arg, "protected"))
1949 default_visibility = VISIBILITY_PROTECTED;
1951 error ("unrecognized visibility value \"%s\"", arg);
1955 case OPT_frandom_seed:
1956 /* The real switch is -fno-random-seed. */
1959 set_random_seed (NULL);
1962 case OPT_frandom_seed_:
1963 set_random_seed (arg);
1966 case OPT_fsched_verbose_:
1967 #ifdef INSN_SCHEDULING
1968 fix_sched_param ("verbose", arg);
1974 case OPT_fsched_stalled_insns_:
1975 flag_sched_stalled_insns = value;
1976 if (flag_sched_stalled_insns == 0)
1977 flag_sched_stalled_insns = -1;
1980 case OPT_fsched_stalled_insns_dep_:
1981 flag_sched_stalled_insns_dep = value;
1984 case OPT_fstack_check_:
1985 if (!strcmp (arg, "no"))
1986 flag_stack_check = NO_STACK_CHECK;
1987 else if (!strcmp (arg, "generic"))
1988 /* This is the old stack checking method. */
1989 flag_stack_check = STACK_CHECK_BUILTIN
1990 ? FULL_BUILTIN_STACK_CHECK
1991 : GENERIC_STACK_CHECK;
1992 else if (!strcmp (arg, "specific"))
1993 /* This is the new stack checking method. */
1994 flag_stack_check = STACK_CHECK_BUILTIN
1995 ? FULL_BUILTIN_STACK_CHECK
1996 : STACK_CHECK_STATIC_BUILTIN
1997 ? STATIC_BUILTIN_STACK_CHECK
1998 : GENERIC_STACK_CHECK;
2000 warning (0, "unknown stack check parameter \"%s\"", arg);
2003 case OPT_fstack_limit:
2004 /* The real switch is -fno-stack-limit. */
2007 stack_limit_rtx = NULL_RTX;
2010 case OPT_fstack_limit_register_:
2012 int reg = decode_reg_name (arg);
2014 error ("unrecognized register name \"%s\"", arg);
2016 stack_limit_rtx = gen_rtx_REG (Pmode, reg);
2020 case OPT_fstack_limit_symbol_:
2021 stack_limit_rtx = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (arg));
2024 case OPT_ftree_vectorizer_verbose_:
2025 vect_set_verbosity_level (arg);
2028 case OPT_ftls_model_:
2029 if (!strcmp (arg, "global-dynamic"))
2030 flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC;
2031 else if (!strcmp (arg, "local-dynamic"))
2032 flag_tls_default = TLS_MODEL_LOCAL_DYNAMIC;
2033 else if (!strcmp (arg, "initial-exec"))
2034 flag_tls_default = TLS_MODEL_INITIAL_EXEC;
2035 else if (!strcmp (arg, "local-exec"))
2036 flag_tls_default = TLS_MODEL_LOCAL_EXEC;
2038 warning (0, "unknown tls-model \"%s\"", arg);
2041 case OPT_fira_algorithm_:
2042 if (!strcmp (arg, "CB"))
2043 flag_ira_algorithm = IRA_ALGORITHM_CB;
2044 else if (!strcmp (arg, "priority"))
2045 flag_ira_algorithm = IRA_ALGORITHM_PRIORITY;
2047 warning (0, "unknown ira algorithm \"%s\"", arg);
2050 case OPT_fira_region_:
2051 if (!strcmp (arg, "one"))
2052 flag_ira_region = IRA_REGION_ONE;
2053 else if (!strcmp (arg, "all"))
2054 flag_ira_region = IRA_REGION_ALL;
2055 else if (!strcmp (arg, "mixed"))
2056 flag_ira_region = IRA_REGION_MIXED;
2058 warning (0, "unknown ira region \"%s\"", arg);
2061 case OPT_fira_verbose_:
2062 flag_ira_verbose = value;
2066 set_debug_level (NO_DEBUG, DEFAULT_GDB_EXTENSIONS, arg);
2070 set_debug_level (SDB_DEBUG, false, arg);
2074 if (value < 2 || value > 4)
2075 error ("dwarf version %d is not supported", value);
2077 dwarf_version = value;
2078 set_debug_level (DWARF2_DEBUG, false, "");
2082 set_debug_level (NO_DEBUG, 2, arg);
2087 set_debug_level (DBX_DEBUG, code == OPT_gstabs_, arg);
2091 set_debug_level (VMS_DEBUG, false, arg);
2096 set_debug_level (XCOFF_DEBUG, code == OPT_gxcoff_, arg);
2100 asm_file_name = arg;
2103 case OPT_pedantic_errors:
2104 flag_pedantic_errors = pedantic = 1;
2105 global_dc->pedantic_errors = 1;
2117 global_dc->dc_inhibit_warnings = true;
2120 case OPT_fuse_linker_plugin:
2121 /* No-op. Used by the driver and passed to us because it starts with f.*/
2125 /* If the flag was handled in a standard way, assume the lack of
2126 processing here is intentional. */
2127 gcc_assert (option_flag_var (scode, opts));
2134 /* Handle --param NAME=VALUE. */
2136 handle_param (struct gcc_options *opts, struct gcc_options *opts_set,
2142 arg = xstrdup (carg);
2143 equal = strchr (arg, '=');
2145 error ("%s: --param arguments should be of the form NAME=VALUE", arg);
2148 value = integral_argument (equal + 1);
2150 error ("invalid --param value %qs", equal + 1);
2154 set_param_value (arg, value,
2155 opts->x_param_values, opts_set->x_param_values);
2162 /* Used to set the level of strict aliasing warnings,
2163 when no level is specified (i.e., when -Wstrict-aliasing, and not
2164 -Wstrict-aliasing=level was given).
2165 ONOFF is assumed to take value 1 when -Wstrict-aliasing is specified,
2166 and 0 otherwise. After calling this function, wstrict_aliasing will be
2167 set to the default value of -Wstrict_aliasing=level, currently 3. */
2169 set_Wstrict_aliasing (int onoff)
2171 gcc_assert (onoff == 0 || onoff == 1);
2173 warn_strict_aliasing = 3;
2175 warn_strict_aliasing = 0;
2178 /* The following routines are useful in setting all the flags that
2179 -ffast-math and -fno-fast-math imply. */
2181 set_fast_math_flags (int set)
2183 flag_unsafe_math_optimizations = set;
2184 set_unsafe_math_optimizations_flags (set);
2185 flag_finite_math_only = set;
2186 flag_errno_math = !set;
2189 flag_signaling_nans = 0;
2190 flag_rounding_math = 0;
2191 flag_cx_limited_range = 1;
2195 /* When -funsafe-math-optimizations is set the following
2196 flags are set as well. */
2198 set_unsafe_math_optimizations_flags (int set)
2200 flag_trapping_math = !set;
2201 flag_signed_zeros = !set;
2202 flag_associative_math = set;
2203 flag_reciprocal_math = set;
2206 /* Return true iff flags are set as if -ffast-math. */
2208 fast_math_flags_set_p (void)
2210 return (!flag_trapping_math
2211 && flag_unsafe_math_optimizations
2212 && flag_finite_math_only
2213 && !flag_signed_zeros
2214 && !flag_errno_math);
2217 /* Return true iff flags are set as if -ffast-math but using the flags stored
2218 in the struct cl_optimization structure. */
2220 fast_math_flags_struct_set_p (struct cl_optimization *opt)
2222 return (!opt->x_flag_trapping_math
2223 && opt->x_flag_unsafe_math_optimizations
2224 && opt->x_flag_finite_math_only
2225 && !opt->x_flag_signed_zeros
2226 && !opt->x_flag_errno_math);
2229 /* Handle a debug output -g switch. EXTENDED is true or false to support
2230 extended output (2 is special and means "-ggdb" was given). */
2232 set_debug_level (enum debug_info_type type, int extended, const char *arg)
2234 static bool type_explicit;
2236 use_gnu_debug_info_extensions = extended;
2238 if (type == NO_DEBUG)
2240 if (write_symbols == NO_DEBUG)
2242 write_symbols = PREFERRED_DEBUGGING_TYPE;
2246 #ifdef DWARF2_DEBUGGING_INFO
2247 write_symbols = DWARF2_DEBUG;
2248 #elif defined DBX_DEBUGGING_INFO
2249 write_symbols = DBX_DEBUG;
2253 if (write_symbols == NO_DEBUG)
2254 warning (0, "target system does not support debug output");
2259 /* Does it conflict with an already selected type? */
2260 if (type_explicit && write_symbols != NO_DEBUG && type != write_symbols)
2261 error ("debug format \"%s\" conflicts with prior selection",
2262 debug_type_names[type]);
2263 write_symbols = type;
2264 type_explicit = true;
2267 /* A debug flag without a level defaults to level 2. */
2270 if (!debug_info_level)
2271 debug_info_level = DINFO_LEVEL_NORMAL;
2275 int argval = integral_argument (arg);
2277 error ("unrecognised debug output level \"%s\"", arg);
2278 else if (argval > 3)
2279 error ("debug output level %s is too high", arg);
2281 debug_info_level = (enum debug_info_level) argval;
2285 /* Return 1 if option OPT_IDX is enabled in OPTS, 0 if it is disabled,
2286 or -1 if it isn't a simple on-off switch. */
2289 option_enabled (int opt_idx, void *opts)
2291 const struct cl_option *option = &(cl_options[opt_idx]);
2292 struct gcc_options *optsg = (struct gcc_options *) opts;
2293 void *flag_var = option_flag_var (opt_idx, optsg);
2296 switch (option->var_type)
2299 return *(int *) flag_var != 0;
2302 return *(int *) flag_var == option->var_value;
2304 case CLVC_BIT_CLEAR:
2305 return (*(int *) flag_var & option->var_value) == 0;
2308 return (*(int *) flag_var & option->var_value) != 0;
2316 /* Fill STATE with the current state of option OPTION in OPTS. Return
2317 true if there is some state to store. */
2320 get_option_state (struct gcc_options *opts, int option,
2321 struct cl_option_state *state)
2323 void *flag_var = option_flag_var (option, opts);
2328 switch (cl_options[option].var_type)
2332 state->data = flag_var;
2333 state->size = sizeof (int);
2336 case CLVC_BIT_CLEAR:
2338 state->ch = option_enabled (option, opts);
2339 state->data = &state->ch;
2344 state->data = *(const char **) flag_var;
2345 if (state->data == 0)
2347 state->size = strlen ((const char *) state->data) + 1;
2353 /* Callback function, called when -Werror= enables a warning. */
2355 static void (*warning_as_error_callback) (int) = NULL;
2357 /* Register a callback for enable_warning_as_error calls. */
2360 register_warning_as_error_callback (void (*callback) (int))
2362 gcc_assert (warning_as_error_callback == NULL || callback == NULL);
2363 warning_as_error_callback = callback;
2366 /* Enable (or disable if VALUE is 0) a warning option ARG (language
2367 mask LANG_MASK, option handlers HANDLERS) as an error for
2368 diagnostic context DC (possibly NULL). This is used by
2372 enable_warning_as_error (const char *arg, int value, unsigned int lang_mask,
2373 const struct cl_option_handlers *handlers,
2374 diagnostic_context *dc)
2379 new_option = XNEWVEC (char, strlen (arg) + 2);
2380 new_option[0] = 'W';
2381 strcpy (new_option + 1, arg);
2382 option_index = find_opt (new_option, lang_mask);
2383 if (option_index == OPT_SPECIAL_unknown)
2385 error ("-Werror=%s: No option -%s", arg, new_option);
2389 const struct cl_option *option = &cl_options[option_index];
2390 const diagnostic_t kind = value ? DK_ERROR : DK_WARNING;
2392 if (option->alias_target != N_OPTS)
2393 option_index = option->alias_target;
2394 if (option_index == OPT_SPECIAL_ignore)
2397 diagnostic_classify_diagnostic (dc, option_index, kind,
2399 if (kind == DK_ERROR)
2401 const struct cl_option * const option = cl_options + option_index;
2403 /* -Werror=foo implies -Wfoo. */
2404 if (option->var_type == CLVC_BOOLEAN)
2405 handle_generated_option (&global_options, &global_options_set,
2406 option_index, NULL, value, lang_mask,
2407 (int)kind, handlers,
2410 if (warning_as_error_callback)
2411 warning_as_error_callback (option_index);
2417 /* Return malloced memory for the name of the option OPTION_INDEX
2418 which enabled a diagnostic (context CONTEXT), originally of type
2419 ORIG_DIAG_KIND but possibly converted to DIAG_KIND by options such
2423 option_name (diagnostic_context *context, int option_index,
2424 diagnostic_t orig_diag_kind, diagnostic_t diag_kind)
2428 /* A warning classified as an error. */
2429 if ((orig_diag_kind == DK_WARNING || orig_diag_kind == DK_PEDWARN)
2430 && diag_kind == DK_ERROR)
2431 return concat (cl_options[OPT_Werror_].opt_text,
2432 /* Skip over "-W". */
2433 cl_options[option_index].opt_text + 2,
2435 /* A warning with option. */
2437 return xstrdup (cl_options[option_index].opt_text);
2439 /* A warning without option classified as an error. */
2440 else if (orig_diag_kind == DK_WARNING || orig_diag_kind == DK_PEDWARN
2441 || diag_kind == DK_WARNING)
2443 if (context->warning_as_error_requested)
2444 return xstrdup (cl_options[OPT_Werror].opt_text);
2446 return xstrdup (_("enabled by default"));