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 /* Language specific warning pass for unused results. */
357 bool flag_warn_unused_result = false;
359 /* Input file names. */
360 const char **in_fnames;
361 unsigned num_in_fnames;
363 static bool common_handle_option (struct gcc_options *opts,
364 struct gcc_options *opts_set,
365 const struct cl_decoded_option *decoded,
366 unsigned int lang_mask, int kind,
367 const struct cl_option_handlers *handlers);
368 static void handle_param (const char *);
369 static char *write_langs (unsigned int lang_mask);
370 static void complain_wrong_lang (const struct cl_decoded_option *,
371 unsigned int lang_mask);
372 static void set_debug_level (enum debug_info_type type, int extended,
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. LANG_MASK
617 contains has a single bit set representing the current
618 language. HANDLERS describes what functions to call for the options. */
620 read_cmdline_options (struct cl_decoded_option *decoded_options,
621 unsigned int decoded_options_count,
622 unsigned int lang_mask,
623 const struct cl_option_handlers *handlers)
627 for (i = 1; i < decoded_options_count; i++)
629 if (decoded_options[i].opt_index == OPT_SPECIAL_input_file)
631 if (main_input_filename == NULL)
633 main_input_filename = decoded_options[i].arg;
634 main_input_baselength
635 = base_of_path (main_input_filename, &main_input_basename);
637 add_input_filename (decoded_options[i].arg);
641 read_cmdline_option (&global_options, &global_options_set,
642 decoded_options + i, lang_mask, handlers);
646 /* Parse command line options and set default flag values. Do minimal
647 options processing. The decoded options are placed in *DECODED_OPTIONS
648 and *DECODED_OPTIONS_COUNT. */
650 decode_options (unsigned int argc, const char **argv,
651 struct cl_decoded_option **decoded_options,
652 unsigned int *decoded_options_count)
654 static bool first_time_p = true;
655 static int initial_min_crossjump_insns;
656 static int initial_max_fields_for_field_sensitive;
657 static int initial_loop_invariant_max_bbs_in_loop;
658 static unsigned int initial_lang_mask;
659 struct cl_option_handlers handlers;
661 unsigned int i, lang_mask;
667 enum unwind_info_type ui_except;
671 /* Perform language-specific options initialization. */
672 initial_lang_mask = lang_mask = lang_hooks.option_lang_mask ();
674 lang_hooks.initialize_diagnostics (global_dc);
676 /* Save initial values of parameters we reset. */
677 initial_min_crossjump_insns
678 = compiler_params[PARAM_MIN_CROSSJUMP_INSNS].value;
679 initial_max_fields_for_field_sensitive
680 = compiler_params[PARAM_MAX_FIELDS_FOR_FIELD_SENSITIVE].value;
681 initial_loop_invariant_max_bbs_in_loop
682 = compiler_params[PARAM_LOOP_INVARIANT_MAX_BBS_IN_LOOP].value;
685 lang_mask = initial_lang_mask;
687 decode_cmdline_options_to_array (argc, argv,
688 lang_mask | CL_COMMON | CL_TARGET,
689 decoded_options, decoded_options_count);
691 /* Perform language-specific options initialization. */
692 lang_hooks.init_options (*decoded_options_count, *decoded_options);
694 handlers.unknown_option_callback = unknown_option_callback;
695 handlers.wrong_lang_callback = complain_wrong_lang;
696 handlers.post_handling_callback = post_handling_callback;
697 handlers.num_handlers = 3;
698 handlers.handlers[0].handler = lang_handle_option;
699 handlers.handlers[0].mask = lang_mask;
700 handlers.handlers[1].handler = common_handle_option;
701 handlers.handlers[1].mask = CL_COMMON;
702 handlers.handlers[2].handler = target_handle_option;
703 handlers.handlers[2].mask = CL_TARGET;
705 /* Scan to see what optimization level has been specified. That will
706 determine the default value of many flags. */
707 for (i = 1; i < *decoded_options_count; i++)
709 struct cl_decoded_option *opt = &(*decoded_options)[i];
710 switch (opt->opt_index)
713 if (*opt->arg == '\0')
721 const int optimize_val = integral_argument (opt->arg);
722 if (optimize_val == -1)
723 error ("argument to %qs should be a non-negative integer",
727 optimize = optimize_val;
728 if ((unsigned int) optimize > 255)
739 /* Optimizing for size forces optimize to be 2. */
745 /* -Ofast only adds flags to -O3. */
752 /* Ignore other options in this prescan. */
757 /* Use priority coloring if cover classes is not defined for the
759 if (targetm.ira_cover_classes == NULL)
760 flag_ira_algorithm = IRA_ALGORITHM_PRIORITY;
762 /* -O1 optimizations. */
763 opt1 = (optimize >= 1);
764 flag_defer_pop = opt1;
766 flag_delayed_branch = opt1;
768 #ifdef CAN_DEBUG_WITHOUT_FP
769 flag_omit_frame_pointer = opt1;
771 flag_guess_branch_prob = opt1;
772 flag_cprop_registers = opt1;
773 flag_forward_propagate = opt1;
774 flag_if_conversion = opt1;
775 flag_if_conversion2 = opt1;
776 flag_ipa_pure_const = opt1;
777 flag_ipa_reference = opt1;
778 flag_ipa_profile = opt1;
779 flag_merge_constants = opt1;
780 flag_split_wide_types = opt1;
781 flag_tree_ccp = opt1;
782 flag_tree_bit_ccp = opt1;
783 flag_tree_dce = opt1;
784 flag_tree_dom = opt1;
785 flag_tree_dse = opt1;
786 flag_tree_ter = opt1;
787 flag_tree_sra = opt1;
788 flag_tree_copyrename = opt1;
789 flag_tree_fre = opt1;
790 flag_tree_copy_prop = opt1;
791 flag_tree_sink = opt1;
793 flag_combine_stack_adjustments = opt1;
795 /* -O2 optimizations. */
796 opt2 = (optimize >= 2);
797 flag_inline_small_functions = opt2;
798 flag_indirect_inlining = opt2;
799 flag_partial_inlining = opt2;
800 flag_thread_jumps = opt2;
801 flag_crossjumping = opt2;
802 flag_optimize_sibling_calls = opt2;
803 flag_cse_follow_jumps = opt2;
805 flag_expensive_optimizations = opt2;
806 flag_rerun_cse_after_loop = opt2;
807 flag_caller_saves = opt2;
808 flag_peephole2 = opt2;
809 #ifdef INSN_SCHEDULING
810 /* Only run the pre-regalloc scheduling pass if optimizing for speed. */
811 flag_schedule_insns = opt2 && ! optimize_size;
812 flag_schedule_insns_after_reload = opt2;
815 flag_strict_aliasing = opt2;
816 flag_strict_overflow = opt2;
817 flag_reorder_blocks = opt2;
818 flag_reorder_functions = opt2;
819 flag_tree_vrp = opt2;
820 flag_tree_builtin_call_dce = opt2;
821 flag_tree_pre = opt2;
822 flag_tree_switch_conversion = opt2;
826 /* Track fields in field-sensitive alias analysis. */
827 set_param_value ("max-fields-for-field-sensitive",
828 (opt2) ? 100 : initial_max_fields_for_field_sensitive);
830 /* For -O1 only do loop invariant motion for very small loops. */
831 set_param_value ("loop-invariant-max-bbs-in-loop",
832 (opt2) ? initial_loop_invariant_max_bbs_in_loop : 1000);
834 /* -O3 optimizations. */
835 opt3 = (optimize >= 3);
836 flag_tree_loop_distribute_patterns = opt3;
837 flag_predictive_commoning = opt3;
838 flag_inline_functions = opt3;
839 flag_unswitch_loops = opt3;
840 flag_gcse_after_reload = opt3;
841 flag_tree_vectorize = opt3;
842 flag_ipa_cp_clone = opt3;
843 if (flag_ipa_cp_clone)
846 /* Just -O1/-O0 optimizations. */
847 opt1_max = (optimize <= 1);
848 align_loops = opt1_max;
849 align_jumps = opt1_max;
850 align_labels = opt1_max;
851 align_functions = opt1_max;
855 /* Inlining of functions reducing size is a good idea regardless of them
856 being declared inline. */
857 flag_inline_functions = 1;
859 /* Basic optimization options. */
864 /* We want to crossjump as much as possible. */
865 set_param_value ("min-crossjump-insns", 1);
868 set_param_value ("min-crossjump-insns", initial_min_crossjump_insns);
870 /* -Ofast adds optimizations to -O3. */
873 /* Which is -ffast-math for now. */
874 set_fast_math_flags (1);
875 /* Allow targets to enable extra options with -Ofast
876 before general options processing so disabling them
877 again afterwards works. */
878 targetm.handle_ofast ();
881 /* Enable -Werror=coverage-mismatch by default */
882 enable_warning_as_error ("coverage-mismatch", 1, lang_mask, &handlers);
886 /* Initialize whether `char' is signed. */
887 flag_signed_char = DEFAULT_SIGNED_CHAR;
888 /* Set this to a special "uninitialized" value. The actual default is
889 set after target options have been processed. */
890 flag_short_enums = 2;
892 /* Initialize target_flags before
893 targetm.target_option.optimization so the latter can modify
895 target_flags = targetm.default_target_flags;
897 /* Some targets have ABI-specified unwind tables. */
898 flag_unwind_tables = targetm.unwind_tables_default;
902 /* Clear any options currently held for LTO. */
903 lto_clear_user_options ();
906 /* Allow default optimizations to be specified on a per-machine basis. */
907 targetm.target_option.optimization (optimize, optimize_size);
909 read_cmdline_options (*decoded_options, *decoded_options_count, lang_mask,
912 if (dump_base_name && ! IS_ABSOLUTE_PATH (dump_base_name))
914 /* First try to make DUMP_BASE_NAME relative to the DUMP_DIR_NAME
915 directory. Then try to make DUMP_BASE_NAME relative to the
916 AUX_BASE_NAME directory, typically the directory to contain
919 dump_base_name = concat (dump_dir_name, dump_base_name, NULL);
920 else if (aux_base_name)
922 const char *aux_base;
924 base_of_path (aux_base_name, &aux_base);
925 if (aux_base_name != aux_base)
927 int dir_len = aux_base - aux_base_name;
928 char *new_dump_base_name =
929 XNEWVEC (char, strlen(dump_base_name) + dir_len + 1);
931 /* Copy directory component from AUX_BASE_NAME. */
932 memcpy (new_dump_base_name, aux_base_name, dir_len);
933 /* Append existing DUMP_BASE_NAME. */
934 strcpy (new_dump_base_name + dir_len, dump_base_name);
935 dump_base_name = new_dump_base_name;
940 /* Handle related options for unit-at-a-time, toplevel-reorder, and
942 if (!flag_unit_at_a_time)
944 if (flag_section_anchors == 1)
945 error ("Section anchors must be disabled when unit-at-a-time "
947 flag_section_anchors = 0;
948 if (flag_toplevel_reorder == 1)
949 error ("Toplevel reorder must be disabled when unit-at-a-time "
951 flag_toplevel_reorder = 0;
954 /* -Wmissing-noreturn is alias for -Wsuggest-attribute=noreturn. */
955 if (warn_missing_noreturn)
956 warn_suggest_attribute_noreturn = true;
958 /* Unless the user has asked for section anchors, we disable toplevel
959 reordering at -O0 to disable transformations that might be surprising
960 to end users and to get -fno-toplevel-reorder tested. */
961 if (!optimize && flag_toplevel_reorder == 2 && flag_section_anchors != 1)
963 flag_toplevel_reorder = 0;
964 flag_section_anchors = 0;
966 if (!flag_toplevel_reorder)
968 if (flag_section_anchors == 1)
969 error ("section anchors must be disabled when toplevel reorder"
971 flag_section_anchors = 0;
978 if (flag_pic && !flag_pie)
980 first_time_p = false;
985 /* Inlining does not work if not optimizing,
986 so force it not to be done. */
991 /* The optimization to partition hot and cold basic blocks into separate
992 sections of the .o and executable files does not work (currently)
993 with exception handling. This is because there is no support for
994 generating unwind info. If flag_exceptions is turned on we need to
995 turn off the partitioning optimization. */
997 ui_except = targetm.except_unwind_info ();
1000 && flag_reorder_blocks_and_partition
1001 && (ui_except == UI_SJLJ || ui_except == UI_TARGET))
1003 inform (input_location,
1004 "-freorder-blocks-and-partition does not work "
1005 "with exceptions on this architecture");
1006 flag_reorder_blocks_and_partition = 0;
1007 flag_reorder_blocks = 1;
1010 /* If user requested unwind info, then turn off the partitioning
1013 if (flag_unwind_tables
1014 && !targetm.unwind_tables_default
1015 && flag_reorder_blocks_and_partition
1016 && (ui_except == UI_SJLJ || ui_except == UI_TARGET))
1018 inform (input_location,
1019 "-freorder-blocks-and-partition does not support "
1020 "unwind info on this architecture");
1021 flag_reorder_blocks_and_partition = 0;
1022 flag_reorder_blocks = 1;
1025 /* If the target requested unwind info, then turn off the partitioning
1026 optimization with a different message. Likewise, if the target does not
1027 support named sections. */
1029 if (flag_reorder_blocks_and_partition
1030 && (!targetm.have_named_sections
1031 || (flag_unwind_tables
1032 && targetm.unwind_tables_default
1033 && (ui_except == UI_SJLJ || ui_except == UI_TARGET))))
1035 inform (input_location,
1036 "-freorder-blocks-and-partition does not work "
1037 "on this architecture");
1038 flag_reorder_blocks_and_partition = 0;
1039 flag_reorder_blocks = 1;
1042 /* Pipelining of outer loops is only possible when general pipelining
1043 capabilities are requested. */
1044 if (!flag_sel_sched_pipelining)
1045 flag_sel_sched_pipelining_outer_loops = 0;
1047 if (!targetm.ira_cover_classes
1048 && flag_ira_algorithm == IRA_ALGORITHM_CB)
1050 inform (input_location,
1051 "-fira-algorithm=CB does not work on this architecture");
1052 flag_ira_algorithm = IRA_ALGORITHM_PRIORITY;
1055 if (flag_conserve_stack)
1057 if (!PARAM_SET_P (PARAM_LARGE_STACK_FRAME))
1058 PARAM_VALUE (PARAM_LARGE_STACK_FRAME) = 100;
1059 if (!PARAM_SET_P (PARAM_STACK_FRAME_GROWTH))
1060 PARAM_VALUE (PARAM_STACK_FRAME_GROWTH) = 40;
1062 if (flag_wpa || flag_ltrans)
1064 /* These passes are not WHOPR compatible yet. */
1066 flag_ipa_struct_reorg = 0;
1069 if (flag_lto || flag_whopr)
1072 flag_generate_lto = 1;
1074 /* When generating IL, do not operate in whole-program mode.
1075 Otherwise, symbols will be privatized too early, causing link
1077 flag_whole_program = 0;
1079 error ("LTO support has not been enabled in this configuration");
1083 /* Reconcile -flto and -fwhopr. Set additional flags as appropriate and
1084 check option consistency. */
1085 if (flag_lto && flag_whopr)
1086 error ("-flto and -fwhopr are mutually exclusive");
1088 /* We initialize flag_split_stack to -1 so that targets can set a
1089 default value if they choose based on other options. */
1090 if (flag_split_stack == -1)
1091 flag_split_stack = 0;
1092 else if (flag_split_stack)
1094 if (!targetm.supports_split_stack (true))
1096 error ("%<-fsplit-stack%> is not supported by "
1097 "this compiler configuration");
1098 flag_split_stack = 0;
1103 #define LEFT_COLUMN 27
1105 /* Output ITEM, of length ITEM_WIDTH, in the left column,
1106 followed by word-wrapped HELP in a second column. */
1108 wrap_help (const char *help,
1110 unsigned int item_width,
1111 unsigned int columns)
1113 unsigned int col_width = LEFT_COLUMN;
1114 unsigned int remaining, room, len;
1116 remaining = strlen (help);
1120 room = columns - 3 - MAX (col_width, item_width);
1129 for (i = 0; help[i]; i++)
1131 if (i >= room && len != remaining)
1135 else if ((help[i] == '-' || help[i] == '/')
1136 && help[i + 1] != ' '
1137 && i > 0 && ISALPHA (help[i - 1]))
1142 printf( " %-*.*s %.*s\n", col_width, item_width, item, len, help);
1144 while (help[len] == ' ')
1152 /* Print help for a specific front-end, etc. */
1154 print_filtered_help (unsigned int include_flags,
1155 unsigned int exclude_flags,
1156 unsigned int any_flags,
1157 unsigned int columns)
1161 static char *printed = NULL;
1163 bool displayed = false;
1165 if (include_flags == CL_PARAMS)
1167 for (i = 0; i < LAST_PARAM; i++)
1169 const char *param = compiler_params[i].option;
1171 help = compiler_params[i].help;
1172 if (help == NULL || *help == '\0')
1174 if (exclude_flags & CL_UNDOCUMENTED)
1176 help = undocumented_msg;
1179 /* Get the translation. */
1182 wrap_help (help, param, strlen (param), columns);
1189 printed = XCNEWVAR (char, cl_options_count);
1191 for (i = 0; i < cl_options_count; i++)
1193 static char new_help[128];
1194 const struct cl_option *option = cl_options + i;
1199 if (include_flags == 0
1200 || ((option->flags & include_flags) != include_flags))
1202 if ((option->flags & any_flags) == 0)
1206 /* Skip unwanted switches. */
1207 if ((option->flags & exclude_flags) != 0)
1210 /* The driver currently prints its own help text. */
1211 if ((option->flags & CL_DRIVER) != 0
1212 && (option->flags & (((1U << cl_lang_count) - 1)
1213 | CL_COMMON | CL_TARGET)) == 0)
1217 /* Skip switches that have already been printed. */
1223 help = option->help;
1226 if (exclude_flags & CL_UNDOCUMENTED)
1228 help = undocumented_msg;
1231 /* Get the translation. */
1234 /* Find the gap between the name of the
1235 option and its descriptive text. */
1236 tab = strchr (help, '\t');
1245 opt = option->opt_text;
1249 /* With the -Q option enabled we change the descriptive text associated
1250 with an option to be an indication of its current setting. */
1253 void *flag_var = option_flag_var (i, &global_options);
1255 if (len < (LEFT_COLUMN + 2))
1256 strcpy (new_help, "\t\t");
1258 strcpy (new_help, "\t");
1260 if (flag_var != NULL)
1262 if (option->flags & CL_JOINED)
1264 if (option->var_type == CLVC_STRING)
1266 if (* (const char **) flag_var != NULL)
1267 snprintf (new_help + strlen (new_help),
1268 sizeof (new_help) - strlen (new_help),
1269 * (const char **) flag_var);
1272 sprintf (new_help + strlen (new_help),
1273 "%#x", * (int *) flag_var);
1276 strcat (new_help, option_enabled (i, &global_options)
1277 ? _("[enabled]") : _("[disabled]"));
1283 wrap_help (help, opt, len, columns);
1289 unsigned int langs = include_flags & CL_LANG_ALL;
1292 printf (_(" No options with the desired characteristics were found\n"));
1297 /* PR 31349: Tell the user how to see all of the
1298 options supported by a specific front end. */
1299 for (i = 0; (1U << i) < CL_LANG_ALL; i ++)
1300 if ((1U << i) & langs)
1301 printf (_(" None found. Use --help=%s to show *all* the options supported by the %s front-end\n"),
1302 lang_names[i], lang_names[i]);
1306 else if (! displayed)
1307 printf (_(" All options with the desired characteristics have already been displayed\n"));
1312 /* Display help for a specified type of option.
1313 The options must have ALL of the INCLUDE_FLAGS set
1314 ANY of the flags in the ANY_FLAGS set
1315 and NONE of the EXCLUDE_FLAGS set. */
1317 print_specific_help (unsigned int include_flags,
1318 unsigned int exclude_flags,
1319 unsigned int any_flags)
1321 unsigned int all_langs_mask = (1U << cl_lang_count) - 1;
1322 const char * description = NULL;
1323 const char * descrip_extra = "";
1326 static unsigned int columns = 0;
1328 /* Sanity check: Make sure that we do not have more
1329 languages than we have bits available to enumerate them. */
1330 gcc_assert ((1U << cl_lang_count) < CL_MIN_OPTION_CLASS);
1332 /* If we have not done so already, obtain
1333 the desired maximum width of the output. */
1338 GET_ENVIRONMENT (p, "COLUMNS");
1341 int value = atoi (p);
1348 /* Use a reasonable default. */
1352 /* Decide upon the title for the options that we are going to display. */
1353 for (i = 0, flag = 1; flag <= CL_MAX_OPTION_CLASS; flag <<= 1, i ++)
1355 switch (flag & include_flags)
1362 description = _("The following options are target specific");
1365 description = _("The following options control compiler warning messages");
1367 case CL_OPTIMIZATION:
1368 description = _("The following options control optimizations");
1371 description = _("The following options are language-independent");
1374 description = _("The --param option recognizes the following as parameters");
1377 if (i >= cl_lang_count)
1379 if (exclude_flags & all_langs_mask)
1380 description = _("The following options are specific to just the language ");
1382 description = _("The following options are supported by the language ");
1383 descrip_extra = lang_names [i];
1388 if (description == NULL)
1392 if (include_flags & CL_UNDOCUMENTED)
1393 description = _("The following options are not documented");
1394 else if (include_flags & CL_SEPARATE)
1395 description = _("The following options take separate arguments");
1396 else if (include_flags & CL_JOINED)
1397 description = _("The following options take joined arguments");
1400 internal_error ("unrecognized include_flags 0x%x passed to print_specific_help",
1407 if (any_flags & all_langs_mask)
1408 description = _("The following options are language-related");
1410 description = _("The following options are language-independent");
1414 printf ("%s%s:\n", description, descrip_extra);
1415 print_filtered_help (include_flags, exclude_flags, any_flags, columns);
1418 /* Handle target- and language-independent options. Return zero to
1419 generate an "unknown option" message. Only options that need
1420 extra handling need to be listed here; if you simply want
1421 DECODED->value assigned to a variable, it happens automatically. */
1424 common_handle_option (struct gcc_options *opts,
1425 struct gcc_options *opts_set,
1426 const struct cl_decoded_option *decoded,
1427 unsigned int lang_mask, int kind ATTRIBUTE_UNUSED,
1428 const struct cl_option_handlers *handlers)
1430 size_t scode = decoded->opt_index;
1431 const char *arg = decoded->arg;
1432 int value = decoded->value;
1433 static bool verbose = false;
1434 enum opt_code code = (enum opt_code) scode;
1436 gcc_assert (opts == &global_options);
1437 gcc_assert (opts_set == &global_options_set);
1438 gcc_assert (decoded->canonical_option_num_elements <= 2);
1452 unsigned int all_langs_mask = (1U << cl_lang_count) - 1;
1453 unsigned int undoc_mask;
1456 undoc_mask = (verbose | extra_warnings) ? 0 : CL_UNDOCUMENTED;
1457 /* First display any single language specific options. */
1458 for (i = 0; i < cl_lang_count; i++)
1460 (1U << i, (all_langs_mask & (~ (1U << i))) | undoc_mask, 0);
1461 /* Next display any multi language specific options. */
1462 print_specific_help (0, undoc_mask, all_langs_mask);
1463 /* Then display any remaining, non-language options. */
1464 for (i = CL_MIN_OPTION_CLASS; i <= CL_MAX_OPTION_CLASS; i <<= 1)
1466 print_specific_help (i, undoc_mask, 0);
1467 exit_after_options = true;
1471 case OPT__target_help:
1472 print_specific_help (CL_TARGET, CL_UNDOCUMENTED, 0);
1473 exit_after_options = true;
1475 /* Allow the target a chance to give the user some additional information. */
1482 const char * a = arg;
1483 unsigned int include_flags = 0;
1484 /* Note - by default we include undocumented options when listing
1485 specific classes. If you only want to see documented options
1486 then add ",^undocumented" to the --help= option. E.g.:
1488 --help=target,^undocumented */
1489 unsigned int exclude_flags = 0;
1491 /* Walk along the argument string, parsing each word in turn.
1493 arg = [^]{word}[,{arg}]
1494 word = {optimizers|target|warnings|undocumented|
1495 params|common|<language>} */
1500 const char * string;
1505 { "optimizers", CL_OPTIMIZATION },
1506 { "target", CL_TARGET },
1507 { "warnings", CL_WARNING },
1508 { "undocumented", CL_UNDOCUMENTED },
1509 { "params", CL_PARAMS },
1510 { "joined", CL_JOINED },
1511 { "separate", CL_SEPARATE },
1512 { "common", CL_COMMON },
1515 unsigned int * pflags;
1517 unsigned int lang_flag, specific_flag;
1524 pflags = & exclude_flags;
1527 pflags = & include_flags;
1529 comma = strchr (a, ',');
1540 /* Check to see if the string matches an option class name. */
1541 for (i = 0, specific_flag = 0; specifics[i].string != NULL; i++)
1542 if (strncasecmp (a, specifics[i].string, len) == 0)
1544 specific_flag = specifics[i].flag;
1548 /* Check to see if the string matches a language name.
1549 Note - we rely upon the alpha-sorted nature of the entries in
1550 the lang_names array, specifically that shorter names appear
1551 before their longer variants. (i.e. C before C++). That way
1552 when we are attempting to match --help=c for example we will
1553 match with C first and not C++. */
1554 for (i = 0, lang_flag = 0; i < cl_lang_count; i++)
1555 if (strncasecmp (a, lang_names[i], len) == 0)
1557 lang_flag = 1U << i;
1561 if (specific_flag != 0)
1564 * pflags |= specific_flag;
1567 /* The option's argument matches both the start of a
1568 language name and the start of an option class name.
1569 We have a special case for when the user has
1570 specified "--help=c", but otherwise we have to issue
1572 if (strncasecmp (a, "c", len) == 0)
1573 * pflags |= lang_flag;
1576 "warning: --help argument %.*s is ambiguous, please be more specific\n",
1580 else if (lang_flag != 0)
1581 * pflags |= lang_flag;
1584 "warning: unrecognized argument to --help= option: %.*s\n",
1593 print_specific_help (include_flags, exclude_flags, 0);
1594 exit_after_options = true;
1599 exit_after_options = true;
1605 /* Currently handled in a prescan. */
1609 enable_warning_as_error (arg, value, lang_mask, handlers);
1612 case OPT_Wlarger_than_:
1613 larger_than_size = value;
1614 warn_larger_than = value != -1;
1617 case OPT_Wfatal_errors:
1618 global_dc->fatal_errors = value;
1621 case OPT_Wframe_larger_than_:
1622 frame_larger_than_size = value;
1623 warn_frame_larger_than = value != -1;
1626 case OPT_Wstrict_aliasing:
1627 set_Wstrict_aliasing (value);
1630 case OPT_Wstrict_aliasing_:
1631 warn_strict_aliasing = value;
1634 case OPT_Wstrict_overflow:
1635 warn_strict_overflow = (value
1636 ? (int) WARN_STRICT_OVERFLOW_CONDITIONAL
1640 case OPT_Wstrict_overflow_:
1641 warn_strict_overflow = value;
1644 case OPT_Wsystem_headers:
1645 global_dc->dc_warn_system_headers = value;
1649 warn_unused = value;
1653 aux_info_file_name = arg;
1654 flag_gen_aux_info = 1;
1658 aux_base_name = arg;
1661 case OPT_auxbase_strip:
1663 char *tmp = xstrdup (arg);
1664 strip_off_ending (tmp, strlen (tmp));
1666 aux_base_name = tmp;
1671 decode_d_option (arg);
1675 dump_base_name = arg;
1679 dump_dir_name = arg;
1682 case OPT_falign_functions_:
1683 align_functions = value;
1686 case OPT_falign_jumps_:
1687 align_jumps = value;
1690 case OPT_falign_labels_:
1691 align_labels = value;
1694 case OPT_falign_loops_:
1695 align_loops = value;
1698 case OPT_fcall_used_:
1699 fix_register (arg, 0, 1);
1702 case OPT_fcall_saved_:
1703 fix_register (arg, 0, 0);
1706 case OPT_fcompare_debug_second:
1707 flag_compare_debug = value;
1711 dbg_cnt_process_opt (arg);
1714 case OPT_fdbg_cnt_list:
1715 dbg_cnt_list_all_counters ();
1718 case OPT_fdebug_prefix_map_:
1719 add_debug_prefix_map (arg);
1722 case OPT_fdiagnostics_show_location_:
1723 if (!strcmp (arg, "once"))
1724 diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
1725 else if (!strcmp (arg, "every-line"))
1726 diagnostic_prefixing_rule (global_dc)
1727 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE;
1732 case OPT_fdiagnostics_show_option:
1733 global_dc->show_option_requested = value;
1737 if (!dump_switch_p (arg))
1741 case OPT_fexcess_precision_:
1742 if (!strcmp (arg, "fast"))
1743 flag_excess_precision_cmdline = EXCESS_PRECISION_FAST;
1744 else if (!strcmp (arg, "standard"))
1745 flag_excess_precision_cmdline = EXCESS_PRECISION_STANDARD;
1747 error ("unknown excess precision style \"%s\"", arg);
1750 case OPT_ffast_math:
1751 set_fast_math_flags (value);
1754 case OPT_funsafe_math_optimizations:
1755 set_unsafe_math_optimizations_flags (value);
1759 fix_register (arg, 1, 1);
1762 case OPT_finline_limit_:
1763 set_param_value ("max-inline-insns-single", value / 2);
1764 set_param_value ("max-inline-insns-auto", value / 2);
1767 case OPT_finstrument_functions_exclude_function_list_:
1768 add_comma_separated_to_vector
1769 (&flag_instrument_functions_exclude_functions, arg);
1772 case OPT_finstrument_functions_exclude_file_list_:
1773 add_comma_separated_to_vector
1774 (&flag_instrument_functions_exclude_files, arg);
1777 case OPT_fmessage_length_:
1778 pp_set_line_maximum_length (global_dc->printer, value);
1781 case OPT_fpack_struct_:
1782 if (value <= 0 || (value & (value - 1)) || value > 16)
1783 error ("structure alignment must be a small power of two, not %d", value);
1786 initial_max_fld_align = value;
1787 maximum_field_alignment = value * BITS_PER_UNIT;
1792 #ifdef ENABLE_PLUGIN
1793 add_new_plugin (arg);
1795 error ("Plugin support is disabled. Configure with --enable-plugin.");
1799 case OPT_fplugin_arg_:
1800 #ifdef ENABLE_PLUGIN
1801 parse_plugin_arg_opt (arg);
1803 error ("Plugin support is disabled. Configure with --enable-plugin.");
1807 case OPT_fprofile_dir_:
1808 profile_data_prefix = xstrdup (arg);
1811 case OPT_fprofile_use_:
1812 profile_data_prefix = xstrdup (arg);
1813 flag_profile_use = true;
1815 /* No break here - do -fprofile-use processing. */
1816 case OPT_fprofile_use:
1817 if (!opts_set->x_flag_branch_probabilities)
1818 flag_branch_probabilities = value;
1819 if (!opts_set->x_flag_profile_values)
1820 flag_profile_values = value;
1821 if (!opts_set->x_flag_unroll_loops)
1822 flag_unroll_loops = value;
1823 if (!opts_set->x_flag_peel_loops)
1824 flag_peel_loops = value;
1825 if (!opts_set->x_flag_tracer)
1826 flag_tracer = value;
1827 if (!opts_set->x_flag_value_profile_transformations)
1828 flag_value_profile_transformations = value;
1829 if (!opts_set->x_flag_inline_functions)
1830 flag_inline_functions = value;
1831 if (!opts_set->x_flag_ipa_cp)
1832 flag_ipa_cp = value;
1833 if (!opts_set->x_flag_ipa_cp_clone
1834 && value && flag_ipa_cp)
1835 flag_ipa_cp_clone = value;
1836 if (!opts_set->x_flag_predictive_commoning)
1837 flag_predictive_commoning = value;
1838 if (!opts_set->x_flag_unswitch_loops)
1839 flag_unswitch_loops = value;
1840 if (!opts_set->x_flag_gcse_after_reload)
1841 flag_gcse_after_reload = value;
1844 case OPT_fprofile_generate_:
1845 profile_data_prefix = xstrdup (arg);
1847 /* No break here - do -fprofile-generate processing. */
1848 case OPT_fprofile_generate:
1849 if (!opts_set->x_profile_arc_flag)
1850 profile_arc_flag = value;
1851 if (!opts_set->x_flag_profile_values)
1852 flag_profile_values = value;
1853 if (!opts_set->x_flag_value_profile_transformations)
1854 flag_value_profile_transformations = value;
1855 if (!opts_set->x_flag_inline_functions)
1856 flag_inline_functions = value;
1859 case OPT_fshow_column:
1860 global_dc->show_column = value;
1863 case OPT_fvisibility_:
1865 if (!strcmp(arg, "default"))
1866 default_visibility = VISIBILITY_DEFAULT;
1867 else if (!strcmp(arg, "internal"))
1868 default_visibility = VISIBILITY_INTERNAL;
1869 else if (!strcmp(arg, "hidden"))
1870 default_visibility = VISIBILITY_HIDDEN;
1871 else if (!strcmp(arg, "protected"))
1872 default_visibility = VISIBILITY_PROTECTED;
1874 error ("unrecognized visibility value \"%s\"", arg);
1878 case OPT_frandom_seed:
1879 /* The real switch is -fno-random-seed. */
1882 set_random_seed (NULL);
1885 case OPT_frandom_seed_:
1886 set_random_seed (arg);
1889 case OPT_fsched_verbose_:
1890 #ifdef INSN_SCHEDULING
1891 fix_sched_param ("verbose", arg);
1897 case OPT_fsched_stalled_insns_:
1898 flag_sched_stalled_insns = value;
1899 if (flag_sched_stalled_insns == 0)
1900 flag_sched_stalled_insns = -1;
1903 case OPT_fsched_stalled_insns_dep_:
1904 flag_sched_stalled_insns_dep = value;
1907 case OPT_fstack_check_:
1908 if (!strcmp (arg, "no"))
1909 flag_stack_check = NO_STACK_CHECK;
1910 else if (!strcmp (arg, "generic"))
1911 /* This is the old stack checking method. */
1912 flag_stack_check = STACK_CHECK_BUILTIN
1913 ? FULL_BUILTIN_STACK_CHECK
1914 : GENERIC_STACK_CHECK;
1915 else if (!strcmp (arg, "specific"))
1916 /* This is the new stack checking method. */
1917 flag_stack_check = STACK_CHECK_BUILTIN
1918 ? FULL_BUILTIN_STACK_CHECK
1919 : STACK_CHECK_STATIC_BUILTIN
1920 ? STATIC_BUILTIN_STACK_CHECK
1921 : GENERIC_STACK_CHECK;
1923 warning (0, "unknown stack check parameter \"%s\"", arg);
1926 case OPT_fstack_limit:
1927 /* The real switch is -fno-stack-limit. */
1930 stack_limit_rtx = NULL_RTX;
1933 case OPT_fstack_limit_register_:
1935 int reg = decode_reg_name (arg);
1937 error ("unrecognized register name \"%s\"", arg);
1939 stack_limit_rtx = gen_rtx_REG (Pmode, reg);
1943 case OPT_fstack_limit_symbol_:
1944 stack_limit_rtx = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (arg));
1947 case OPT_ftree_vectorizer_verbose_:
1948 vect_set_verbosity_level (arg);
1951 case OPT_ftls_model_:
1952 if (!strcmp (arg, "global-dynamic"))
1953 flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC;
1954 else if (!strcmp (arg, "local-dynamic"))
1955 flag_tls_default = TLS_MODEL_LOCAL_DYNAMIC;
1956 else if (!strcmp (arg, "initial-exec"))
1957 flag_tls_default = TLS_MODEL_INITIAL_EXEC;
1958 else if (!strcmp (arg, "local-exec"))
1959 flag_tls_default = TLS_MODEL_LOCAL_EXEC;
1961 warning (0, "unknown tls-model \"%s\"", arg);
1964 case OPT_fira_algorithm_:
1965 if (!strcmp (arg, "CB"))
1966 flag_ira_algorithm = IRA_ALGORITHM_CB;
1967 else if (!strcmp (arg, "priority"))
1968 flag_ira_algorithm = IRA_ALGORITHM_PRIORITY;
1970 warning (0, "unknown ira algorithm \"%s\"", arg);
1973 case OPT_fira_region_:
1974 if (!strcmp (arg, "one"))
1975 flag_ira_region = IRA_REGION_ONE;
1976 else if (!strcmp (arg, "all"))
1977 flag_ira_region = IRA_REGION_ALL;
1978 else if (!strcmp (arg, "mixed"))
1979 flag_ira_region = IRA_REGION_MIXED;
1981 warning (0, "unknown ira region \"%s\"", arg);
1984 case OPT_fira_verbose_:
1985 flag_ira_verbose = value;
1989 set_debug_level (NO_DEBUG, DEFAULT_GDB_EXTENSIONS, arg);
1993 set_debug_level (SDB_DEBUG, false, arg);
1997 if (value < 2 || value > 4)
1998 error ("dwarf version %d is not supported", value);
2000 dwarf_version = value;
2001 set_debug_level (DWARF2_DEBUG, false, "");
2005 set_debug_level (NO_DEBUG, 2, arg);
2010 set_debug_level (DBX_DEBUG, code == OPT_gstabs_, arg);
2014 set_debug_level (VMS_DEBUG, false, arg);
2019 set_debug_level (XCOFF_DEBUG, code == OPT_gxcoff_, arg);
2023 asm_file_name = arg;
2026 case OPT_pedantic_errors:
2027 flag_pedantic_errors = pedantic = 1;
2028 global_dc->pedantic_errors = 1;
2040 global_dc->dc_inhibit_warnings = true;
2043 case OPT_fuse_linker_plugin:
2044 /* No-op. Used by the driver and passed to us because it starts with f.*/
2048 /* If the flag was handled in a standard way, assume the lack of
2049 processing here is intentional. */
2050 gcc_assert (option_flag_var (scode, opts));
2057 /* Handle --param NAME=VALUE. */
2059 handle_param (const char *carg)
2064 arg = xstrdup (carg);
2065 equal = strchr (arg, '=');
2067 error ("%s: --param arguments should be of the form NAME=VALUE", arg);
2070 value = integral_argument (equal + 1);
2072 error ("invalid --param value %qs", equal + 1);
2076 set_param_value (arg, value);
2083 /* Used to set the level of strict aliasing warnings,
2084 when no level is specified (i.e., when -Wstrict-aliasing, and not
2085 -Wstrict-aliasing=level was given).
2086 ONOFF is assumed to take value 1 when -Wstrict-aliasing is specified,
2087 and 0 otherwise. After calling this function, wstrict_aliasing will be
2088 set to the default value of -Wstrict_aliasing=level, currently 3. */
2090 set_Wstrict_aliasing (int onoff)
2092 gcc_assert (onoff == 0 || onoff == 1);
2094 warn_strict_aliasing = 3;
2096 warn_strict_aliasing = 0;
2099 /* The following routines are useful in setting all the flags that
2100 -ffast-math and -fno-fast-math imply. */
2102 set_fast_math_flags (int set)
2104 flag_unsafe_math_optimizations = set;
2105 set_unsafe_math_optimizations_flags (set);
2106 flag_finite_math_only = set;
2107 flag_errno_math = !set;
2110 flag_signaling_nans = 0;
2111 flag_rounding_math = 0;
2112 flag_cx_limited_range = 1;
2116 /* When -funsafe-math-optimizations is set the following
2117 flags are set as well. */
2119 set_unsafe_math_optimizations_flags (int set)
2121 flag_trapping_math = !set;
2122 flag_signed_zeros = !set;
2123 flag_associative_math = set;
2124 flag_reciprocal_math = set;
2127 /* Return true iff flags are set as if -ffast-math. */
2129 fast_math_flags_set_p (void)
2131 return (!flag_trapping_math
2132 && flag_unsafe_math_optimizations
2133 && flag_finite_math_only
2134 && !flag_signed_zeros
2135 && !flag_errno_math);
2138 /* Return true iff flags are set as if -ffast-math but using the flags stored
2139 in the struct cl_optimization structure. */
2141 fast_math_flags_struct_set_p (struct cl_optimization *opt)
2143 return (!opt->x_flag_trapping_math
2144 && opt->x_flag_unsafe_math_optimizations
2145 && opt->x_flag_finite_math_only
2146 && !opt->x_flag_signed_zeros
2147 && !opt->x_flag_errno_math);
2150 /* Handle a debug output -g switch. EXTENDED is true or false to support
2151 extended output (2 is special and means "-ggdb" was given). */
2153 set_debug_level (enum debug_info_type type, int extended, const char *arg)
2155 static bool type_explicit;
2157 use_gnu_debug_info_extensions = extended;
2159 if (type == NO_DEBUG)
2161 if (write_symbols == NO_DEBUG)
2163 write_symbols = PREFERRED_DEBUGGING_TYPE;
2167 #ifdef DWARF2_DEBUGGING_INFO
2168 write_symbols = DWARF2_DEBUG;
2169 #elif defined DBX_DEBUGGING_INFO
2170 write_symbols = DBX_DEBUG;
2174 if (write_symbols == NO_DEBUG)
2175 warning (0, "target system does not support debug output");
2180 /* Does it conflict with an already selected type? */
2181 if (type_explicit && write_symbols != NO_DEBUG && type != write_symbols)
2182 error ("debug format \"%s\" conflicts with prior selection",
2183 debug_type_names[type]);
2184 write_symbols = type;
2185 type_explicit = true;
2188 /* A debug flag without a level defaults to level 2. */
2191 if (!debug_info_level)
2192 debug_info_level = DINFO_LEVEL_NORMAL;
2196 int argval = integral_argument (arg);
2198 error ("unrecognised debug output level \"%s\"", arg);
2199 else if (argval > 3)
2200 error ("debug output level %s is too high", arg);
2202 debug_info_level = (enum debug_info_level) argval;
2206 /* Return 1 if option OPT_IDX is enabled in OPTS, 0 if it is disabled,
2207 or -1 if it isn't a simple on-off switch. */
2210 option_enabled (int opt_idx, void *opts)
2212 const struct cl_option *option = &(cl_options[opt_idx]);
2213 struct gcc_options *optsg = (struct gcc_options *) opts;
2214 void *flag_var = option_flag_var (opt_idx, optsg);
2217 switch (option->var_type)
2220 return *(int *) flag_var != 0;
2223 return *(int *) flag_var == option->var_value;
2225 case CLVC_BIT_CLEAR:
2226 return (*(int *) flag_var & option->var_value) == 0;
2229 return (*(int *) flag_var & option->var_value) != 0;
2237 /* Fill STATE with the current state of option OPTION in OPTS. Return
2238 true if there is some state to store. */
2241 get_option_state (struct gcc_options *opts, int option,
2242 struct cl_option_state *state)
2244 void *flag_var = option_flag_var (option, opts);
2249 switch (cl_options[option].var_type)
2253 state->data = flag_var;
2254 state->size = sizeof (int);
2257 case CLVC_BIT_CLEAR:
2259 state->ch = option_enabled (option, opts);
2260 state->data = &state->ch;
2265 state->data = *(const char **) flag_var;
2266 if (state->data == 0)
2268 state->size = strlen ((const char *) state->data) + 1;
2274 /* Callback function, called when -Werror= enables a warning. */
2276 static void (*warning_as_error_callback) (int) = NULL;
2278 /* Register a callback for enable_warning_as_error calls. */
2281 register_warning_as_error_callback (void (*callback) (int))
2283 gcc_assert (warning_as_error_callback == NULL || callback == NULL);
2284 warning_as_error_callback = callback;
2287 /* Enable a warning option as an error. This is used by -Werror= and
2288 also by legacy Werror-implicit-function-declaration. */
2291 enable_warning_as_error (const char *arg, int value, unsigned int lang_mask,
2292 const struct cl_option_handlers *handlers)
2297 new_option = XNEWVEC (char, strlen (arg) + 2);
2298 new_option[0] = 'W';
2299 strcpy (new_option + 1, arg);
2300 option_index = find_opt (new_option, lang_mask);
2301 if (option_index == OPT_SPECIAL_unknown)
2303 error ("-Werror=%s: No option -%s", arg, new_option);
2307 const struct cl_option *option = &cl_options[option_index];
2308 const diagnostic_t kind = value ? DK_ERROR : DK_WARNING;
2310 if (option->alias_target != N_OPTS)
2311 option_index = option->alias_target;
2312 if (option_index == OPT_SPECIAL_ignore)
2314 diagnostic_classify_diagnostic (global_dc, option_index, kind,
2316 if (kind == DK_ERROR)
2318 const struct cl_option * const option = cl_options + option_index;
2320 /* -Werror=foo implies -Wfoo. */
2321 if (option->var_type == CLVC_BOOLEAN)
2322 handle_generated_option (&global_options, &global_options_set,
2323 option_index, NULL, value, lang_mask,
2324 (int)kind, handlers);
2326 if (warning_as_error_callback)
2327 warning_as_error_callback (option_index);
2333 /* Return malloced memory for the name of the option OPTION_INDEX
2334 which enabled a diagnostic (context CONTEXT), originally of type
2335 ORIG_DIAG_KIND but possibly converted to DIAG_KIND by options such
2339 option_name (diagnostic_context *context, int option_index,
2340 diagnostic_t orig_diag_kind, diagnostic_t diag_kind)
2344 /* A warning classified as an error. */
2345 if ((orig_diag_kind == DK_WARNING || orig_diag_kind == DK_PEDWARN)
2346 && diag_kind == DK_ERROR)
2347 return concat (cl_options[OPT_Werror_].opt_text,
2348 /* Skip over "-W". */
2349 cl_options[option_index].opt_text + 2,
2351 /* A warning with option. */
2353 return xstrdup (cl_options[option_index].opt_text);
2355 /* A warning without option classified as an error. */
2356 else if (orig_diag_kind == DK_WARNING || orig_diag_kind == DK_PEDWARN
2357 || diag_kind == DK_WARNING)
2359 if (context->warning_as_error_requested)
2360 return xstrdup (cl_options[OPT_Werror].opt_text);
2362 return xstrdup (_("enabled by default"));