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,
373 /* Return a malloced slash-separated list of languages in MASK. */
375 write_langs (unsigned int mask)
377 unsigned int n = 0, len = 0;
378 const char *lang_name;
381 for (n = 0; (lang_name = lang_names[n]) != 0; n++)
382 if (mask & (1U << n))
383 len += strlen (lang_name) + 1;
385 result = XNEWVEC (char, len);
387 for (n = 0; (lang_name = lang_names[n]) != 0; n++)
388 if (mask & (1U << n))
392 strcpy (result + len, lang_name);
393 len += strlen (lang_name);
401 /* Complain that switch DECODED does not apply to this front end (mask
404 complain_wrong_lang (const struct cl_decoded_option *decoded,
405 unsigned int lang_mask)
407 const struct cl_option *option = &cl_options[decoded->opt_index];
408 const char *text = decoded->orig_option_with_args_text;
409 char *ok_langs = NULL, *bad_lang = NULL;
410 unsigned int opt_flags = option->flags;
412 if (!lang_hooks.complain_wrong_lang_p (option))
415 opt_flags &= ((1U << cl_lang_count) - 1) | CL_DRIVER;
416 if (opt_flags != CL_DRIVER)
417 ok_langs = write_langs (opt_flags);
418 if (lang_mask != CL_DRIVER)
419 bad_lang = write_langs (lang_mask);
421 if (opt_flags == CL_DRIVER)
422 error ("command line option %qs is valid for the driver but not for %s",
424 else if (lang_mask == CL_DRIVER)
427 /* Eventually this should become a hard error IMO. */
428 warning (0, "command line option %qs is valid for %s but not for %s",
429 text, ok_langs, bad_lang);
435 /* Buffer the unknown option described by the string OPT. Currently,
436 we only complain about unknown -Wno-* options if they may have
437 prevented a diagnostic. Otherwise, we just ignore them.
438 Note that if we do complain, it is only as a warning, not an error;
439 passing the compiler an unrecognised -Wno-* option should never
440 change whether the compilation succeeds or fails. */
442 static void postpone_unknown_option_warning(const char *opt)
444 VEC_safe_push (const_char_p, heap, ignored_options, opt);
447 /* Produce a warning for each option previously buffered. */
449 void print_ignored_options (void)
451 location_t saved_loc = input_location;
455 while (!VEC_empty (const_char_p, ignored_options))
458 opt = VEC_pop (const_char_p, ignored_options);
459 warning (0, "unrecognized command line option \"%s\"", opt);
462 input_location = saved_loc;
465 /* Handle an unknown option DECODED, returning true if an error should be
469 unknown_option_callback (const struct cl_decoded_option *decoded)
471 const char *opt = decoded->arg;
473 if (opt[1] == 'W' && opt[2] == 'n' && opt[3] == 'o' && opt[4] == '-'
474 && !(decoded->errors & CL_ERR_NEGATIVE))
476 /* We don't generate warnings for unknown -Wno-* options unless
477 we issue diagnostics. */
478 postpone_unknown_option_warning (opt);
485 /* Note that an option DECODED has been successfully handled with a
486 handler for mask MASK. */
489 post_handling_callback (const struct cl_decoded_option *decoded ATTRIBUTE_UNUSED,
490 unsigned int mask ATTRIBUTE_UNUSED)
493 lto_register_user_option (decoded->opt_index, decoded->arg,
494 decoded->value, mask);
498 /* Handle a front-end option; arguments and return value as for
502 lang_handle_option (struct gcc_options *opts,
503 struct gcc_options *opts_set,
504 const struct cl_decoded_option *decoded,
505 unsigned int lang_mask ATTRIBUTE_UNUSED, int kind,
506 const struct cl_option_handlers *handlers)
508 gcc_assert (opts == &global_options);
509 gcc_assert (opts_set == &global_options_set);
510 gcc_assert (decoded->canonical_option_num_elements <= 2);
511 return lang_hooks.handle_option (decoded->opt_index, decoded->arg,
512 decoded->value, kind, handlers);
515 /* Handle a back-end option; arguments and return value as for
519 target_handle_option (struct gcc_options *opts,
520 struct gcc_options *opts_set,
521 const struct cl_decoded_option *decoded,
522 unsigned int lang_mask ATTRIBUTE_UNUSED, int kind,
523 const struct cl_option_handlers *handlers ATTRIBUTE_UNUSED)
525 gcc_assert (opts == &global_options);
526 gcc_assert (opts_set == &global_options_set);
527 gcc_assert (decoded->canonical_option_num_elements <= 2);
528 gcc_assert (kind == DK_UNSPECIFIED);
529 return targetm.handle_option (decoded->opt_index, decoded->arg,
533 /* Handle FILENAME from the command line. */
535 add_input_filename (const char *filename)
538 in_fnames = XRESIZEVEC (const char *, in_fnames, num_in_fnames);
539 in_fnames[num_in_fnames - 1] = filename;
542 /* Add comma-separated strings to a char_p vector. */
545 add_comma_separated_to_vector (VEC(char_p,heap) **pvec, const char* arg)
552 /* We never free this string. */
565 VEC_safe_push (char_p, heap, *pvec, token_start);
568 if (*r == '\\' && r[1] == ',')
576 if (*token_start != '\0')
577 VEC_safe_push (char_p, heap, *pvec, token_start);
580 /* Return whether we should exclude FNDECL from instrumentation. */
583 flag_instrument_functions_exclude_p (tree fndecl)
585 if (VEC_length (char_p, flag_instrument_functions_exclude_functions) > 0)
591 name = lang_hooks.decl_printable_name (fndecl, 0);
592 FOR_EACH_VEC_ELT (char_p, flag_instrument_functions_exclude_functions,
594 if (strstr (name, s) != NULL)
598 if (VEC_length (char_p, flag_instrument_functions_exclude_files) > 0)
604 name = DECL_SOURCE_FILE (fndecl);
605 FOR_EACH_VEC_ELT (char_p, flag_instrument_functions_exclude_files, i, s)
606 if (strstr (name, s) != NULL)
614 /* Handle the vector of command line options, storing the results of
615 processing DECODED_OPTIONS and DECODED_OPTIONS_COUNT in OPTS and
616 OPTS_SET. LANG_MASK contains has a single bit set representing the
617 current language. HANDLERS describes what functions to call for
620 read_cmdline_options (struct gcc_options *opts, struct gcc_options *opts_set,
621 struct cl_decoded_option *decoded_options,
622 unsigned int decoded_options_count,
623 unsigned int lang_mask,
624 const struct cl_option_handlers *handlers)
628 for (i = 1; i < decoded_options_count; i++)
630 if (decoded_options[i].opt_index == OPT_SPECIAL_input_file)
632 /* Input files should only ever appear on the main command
634 gcc_assert (opts == &global_options);
635 gcc_assert (opts_set == &global_options_set);
637 if (main_input_filename == NULL)
639 main_input_filename = decoded_options[i].arg;
640 main_input_baselength
641 = base_of_path (main_input_filename, &main_input_basename);
643 add_input_filename (decoded_options[i].arg);
647 read_cmdline_option (opts, opts_set,
648 decoded_options + i, lang_mask, handlers,
653 /* Language mask determined at initialization. */
654 static unsigned int initial_lang_mask;
656 /* Initialize global options-related settings at start-up. */
659 init_options_once (void)
661 /* Perform language-specific options initialization. */
662 initial_lang_mask = lang_hooks.option_lang_mask ();
664 lang_hooks.initialize_diagnostics (global_dc);
667 /* Initialize OPTS and OPTS_SET before using them in parsing options. */
670 init_options_struct (struct gcc_options *opts, struct gcc_options *opts_set)
672 size_t num_params = get_num_compiler_params ();
674 *opts = global_options_init;
675 memset (opts_set, 0, sizeof (*opts_set));
677 opts->x_param_values = XNEWVEC (int, num_params);
678 opts_set->x_param_values = XCNEWVEC (int, num_params);
679 init_param_values (opts->x_param_values);
681 /* Use priority coloring if cover classes is not defined for the
683 if (targetm.ira_cover_classes == NULL)
684 opts->x_flag_ira_algorithm = IRA_ALGORITHM_PRIORITY;
686 /* Initialize whether `char' is signed. */
687 opts->x_flag_signed_char = DEFAULT_SIGNED_CHAR;
688 /* Set this to a special "uninitialized" value. The actual default
689 is set after target options have been processed. */
690 opts->x_flag_short_enums = 2;
692 /* Initialize target_flags before targetm.target_option.optimization
693 so the latter can modify it. */
694 opts->x_target_flags = targetm.default_target_flags;
696 /* Some targets have ABI-specified unwind tables. */
697 opts->x_flag_unwind_tables = targetm.unwind_tables_default;
700 /* Decode command-line options to an array, like
701 decode_cmdline_options_to_array and with the same arguments but
702 using the default lang_mask. */
705 decode_cmdline_options_to_array_default_mask (unsigned int argc,
707 struct cl_decoded_option **decoded_options,
708 unsigned int *decoded_options_count)
710 decode_cmdline_options_to_array (argc, argv,
711 initial_lang_mask | CL_COMMON | CL_TARGET,
712 decoded_options, decoded_options_count);
715 /* Default the options in OPTS and OPTS_SET based on the optimization
716 settings in DECODED_OPTIONS and DECODED_OPTIONS_COUNT. */
718 default_options_optimization (struct gcc_options *opts,
719 struct gcc_options *opts_set,
720 struct cl_decoded_option *decoded_options,
721 unsigned int decoded_options_count)
730 gcc_assert (opts == &global_options);
731 gcc_assert (opts_set = &global_options_set);
733 /* Scan to see what optimization level has been specified. That will
734 determine the default value of many flags. */
735 for (i = 1; i < decoded_options_count; i++)
737 struct cl_decoded_option *opt = &decoded_options[i];
738 switch (opt->opt_index)
741 if (*opt->arg == '\0')
749 const int optimize_val = integral_argument (opt->arg);
750 if (optimize_val == -1)
751 error ("argument to %qs should be a non-negative integer",
755 optimize = optimize_val;
756 if ((unsigned int) optimize > 255)
767 /* Optimizing for size forces optimize to be 2. */
773 /* -Ofast only adds flags to -O3. */
780 /* Ignore other options in this prescan. */
785 /* -O1 optimizations. */
786 opt1 = (optimize >= 1);
787 flag_defer_pop = opt1;
789 flag_delayed_branch = opt1;
791 #ifdef CAN_DEBUG_WITHOUT_FP
792 flag_omit_frame_pointer = opt1;
794 flag_guess_branch_prob = opt1;
795 flag_cprop_registers = opt1;
796 flag_forward_propagate = opt1;
797 flag_if_conversion = opt1;
798 flag_if_conversion2 = opt1;
799 flag_ipa_pure_const = opt1;
800 flag_ipa_reference = opt1;
801 flag_ipa_profile = opt1;
802 flag_merge_constants = opt1;
803 flag_split_wide_types = opt1;
804 flag_tree_ccp = opt1;
805 flag_tree_bit_ccp = opt1;
806 flag_tree_dce = opt1;
807 flag_tree_dom = opt1;
808 flag_tree_dse = opt1;
809 flag_tree_ter = opt1;
810 flag_tree_sra = opt1;
811 flag_tree_copyrename = opt1;
812 flag_tree_fre = opt1;
813 flag_tree_copy_prop = opt1;
814 flag_tree_sink = opt1;
816 flag_combine_stack_adjustments = opt1;
818 /* -O2 optimizations. */
819 opt2 = (optimize >= 2);
820 flag_inline_small_functions = opt2;
821 flag_indirect_inlining = opt2;
822 flag_partial_inlining = opt2;
823 flag_thread_jumps = opt2;
824 flag_crossjumping = opt2;
825 flag_optimize_sibling_calls = opt2;
826 flag_cse_follow_jumps = opt2;
828 flag_expensive_optimizations = opt2;
829 flag_rerun_cse_after_loop = opt2;
830 flag_caller_saves = opt2;
831 flag_peephole2 = opt2;
832 #ifdef INSN_SCHEDULING
833 /* Only run the pre-regalloc scheduling pass if optimizing for speed. */
834 flag_schedule_insns = opt2 && ! optimize_size;
835 flag_schedule_insns_after_reload = opt2;
838 flag_strict_aliasing = opt2;
839 flag_strict_overflow = opt2;
840 flag_reorder_blocks = opt2;
841 flag_reorder_functions = opt2;
842 flag_tree_vrp = opt2;
843 flag_tree_builtin_call_dce = opt2;
844 flag_tree_pre = opt2;
845 flag_tree_switch_conversion = opt2;
849 /* Track fields in field-sensitive alias analysis. */
850 maybe_set_param_value
851 (PARAM_MAX_FIELDS_FOR_FIELD_SENSITIVE,
852 opt2 ? 100 : default_param_value (PARAM_MAX_FIELDS_FOR_FIELD_SENSITIVE),
853 opts->x_param_values, opts_set->x_param_values);
855 /* For -O1 only do loop invariant motion for very small loops. */
856 maybe_set_param_value
857 (PARAM_LOOP_INVARIANT_MAX_BBS_IN_LOOP,
858 opt2 ? default_param_value (PARAM_LOOP_INVARIANT_MAX_BBS_IN_LOOP) : 1000,
859 opts->x_param_values, opts_set->x_param_values);
861 /* -O3 optimizations. */
862 opt3 = (optimize >= 3);
863 flag_tree_loop_distribute_patterns = opt3;
864 flag_predictive_commoning = opt3;
865 flag_inline_functions = opt3;
866 flag_unswitch_loops = opt3;
867 flag_gcse_after_reload = opt3;
868 flag_tree_vectorize = opt3;
869 flag_ipa_cp_clone = opt3;
870 if (flag_ipa_cp_clone)
873 /* Just -O1/-O0 optimizations. */
874 opt1_max = (optimize <= 1);
875 align_loops = opt1_max;
876 align_jumps = opt1_max;
877 align_labels = opt1_max;
878 align_functions = opt1_max;
882 /* Inlining of functions reducing size is a good idea regardless of them
883 being declared inline. */
884 flag_inline_functions = 1;
886 /* Basic optimization options. */
891 /* We want to crossjump as much as possible. */
892 maybe_set_param_value (PARAM_MIN_CROSSJUMP_INSNS, 1,
893 opts->x_param_values, opts_set->x_param_values);
896 maybe_set_param_value (PARAM_MIN_CROSSJUMP_INSNS,
897 default_param_value (PARAM_MIN_CROSSJUMP_INSNS),
898 opts->x_param_values, opts_set->x_param_values);
900 /* -Ofast adds optimizations to -O3. */
903 /* Which is -ffast-math for now. */
904 set_fast_math_flags (1);
905 /* Allow targets to enable extra options with -Ofast
906 before general options processing so disabling them
907 again afterwards works. */
908 targetm.handle_ofast ();
911 /* Allow default optimizations to be specified on a per-machine basis. */
912 targetm.target_option.optimization (optimize, optimize_size);
915 static void finish_options (struct gcc_options *, struct gcc_options *);
917 /* Parse command line options and set default flag values. Do minimal
918 options processing. The decoded options are in *DECODED_OPTIONS
919 and *DECODED_OPTIONS_COUNT. */
921 decode_options (struct gcc_options *opts, struct gcc_options *opts_set,
922 struct cl_decoded_option *decoded_options,
923 unsigned int decoded_options_count)
925 struct cl_option_handlers handlers;
927 unsigned int lang_mask;
929 lang_mask = initial_lang_mask;
931 handlers.unknown_option_callback = unknown_option_callback;
932 handlers.wrong_lang_callback = complain_wrong_lang;
933 handlers.post_handling_callback = post_handling_callback;
934 handlers.num_handlers = 3;
935 handlers.handlers[0].handler = lang_handle_option;
936 handlers.handlers[0].mask = lang_mask;
937 handlers.handlers[1].handler = common_handle_option;
938 handlers.handlers[1].mask = CL_COMMON;
939 handlers.handlers[2].handler = target_handle_option;
940 handlers.handlers[2].mask = CL_TARGET;
942 /* Enable -Werror=coverage-mismatch by default */
943 enable_warning_as_error ("coverage-mismatch", 1, lang_mask, &handlers,
946 default_options_optimization (opts, opts_set,
947 decoded_options, decoded_options_count);
950 /* Clear any options currently held for LTO. */
951 lto_clear_user_options ();
954 read_cmdline_options (opts, opts_set,
955 decoded_options, decoded_options_count, lang_mask,
958 finish_options (opts, opts_set);
961 /* After all options have been read into OPTS and OPTS_SET, finalize
962 settings of those options and diagnose incompatible
965 finish_options (struct gcc_options *opts, struct gcc_options *opts_set)
967 static bool first_time_p = true;
968 enum unwind_info_type ui_except;
970 gcc_assert (opts == &global_options);
971 gcc_assert (opts_set = &global_options_set);
973 if (dump_base_name && ! IS_ABSOLUTE_PATH (dump_base_name))
975 /* First try to make DUMP_BASE_NAME relative to the DUMP_DIR_NAME
976 directory. Then try to make DUMP_BASE_NAME relative to the
977 AUX_BASE_NAME directory, typically the directory to contain
980 dump_base_name = concat (dump_dir_name, dump_base_name, NULL);
981 else if (aux_base_name)
983 const char *aux_base;
985 base_of_path (aux_base_name, &aux_base);
986 if (aux_base_name != aux_base)
988 int dir_len = aux_base - aux_base_name;
989 char *new_dump_base_name =
990 XNEWVEC (char, strlen(dump_base_name) + dir_len + 1);
992 /* Copy directory component from AUX_BASE_NAME. */
993 memcpy (new_dump_base_name, aux_base_name, dir_len);
994 /* Append existing DUMP_BASE_NAME. */
995 strcpy (new_dump_base_name + dir_len, dump_base_name);
996 dump_base_name = new_dump_base_name;
1001 /* Handle related options for unit-at-a-time, toplevel-reorder, and
1003 if (!flag_unit_at_a_time)
1005 if (flag_section_anchors == 1)
1006 error ("Section anchors must be disabled when unit-at-a-time "
1008 flag_section_anchors = 0;
1009 if (flag_toplevel_reorder == 1)
1010 error ("Toplevel reorder must be disabled when unit-at-a-time "
1012 flag_toplevel_reorder = 0;
1015 /* -Wmissing-noreturn is alias for -Wsuggest-attribute=noreturn. */
1016 if (warn_missing_noreturn)
1017 warn_suggest_attribute_noreturn = true;
1019 /* Unless the user has asked for section anchors, we disable toplevel
1020 reordering at -O0 to disable transformations that might be surprising
1021 to end users and to get -fno-toplevel-reorder tested. */
1022 if (!optimize && flag_toplevel_reorder == 2 && flag_section_anchors != 1)
1024 flag_toplevel_reorder = 0;
1025 flag_section_anchors = 0;
1027 if (!flag_toplevel_reorder)
1029 if (flag_section_anchors == 1)
1030 error ("section anchors must be disabled when toplevel reorder"
1032 flag_section_anchors = 0;
1038 flag_pic = flag_pie;
1039 if (flag_pic && !flag_pie)
1041 first_time_p = false;
1046 /* Inlining does not work if not optimizing,
1047 so force it not to be done. */
1052 /* The optimization to partition hot and cold basic blocks into separate
1053 sections of the .o and executable files does not work (currently)
1054 with exception handling. This is because there is no support for
1055 generating unwind info. If flag_exceptions is turned on we need to
1056 turn off the partitioning optimization. */
1058 ui_except = targetm.except_unwind_info ();
1061 && flag_reorder_blocks_and_partition
1062 && (ui_except == UI_SJLJ || ui_except == UI_TARGET))
1064 inform (input_location,
1065 "-freorder-blocks-and-partition does not work "
1066 "with exceptions on this architecture");
1067 flag_reorder_blocks_and_partition = 0;
1068 flag_reorder_blocks = 1;
1071 /* If user requested unwind info, then turn off the partitioning
1074 if (flag_unwind_tables
1075 && !targetm.unwind_tables_default
1076 && flag_reorder_blocks_and_partition
1077 && (ui_except == UI_SJLJ || ui_except == UI_TARGET))
1079 inform (input_location,
1080 "-freorder-blocks-and-partition does not support "
1081 "unwind info on this architecture");
1082 flag_reorder_blocks_and_partition = 0;
1083 flag_reorder_blocks = 1;
1086 /* If the target requested unwind info, then turn off the partitioning
1087 optimization with a different message. Likewise, if the target does not
1088 support named sections. */
1090 if (flag_reorder_blocks_and_partition
1091 && (!targetm.have_named_sections
1092 || (flag_unwind_tables
1093 && targetm.unwind_tables_default
1094 && (ui_except == UI_SJLJ || ui_except == UI_TARGET))))
1096 inform (input_location,
1097 "-freorder-blocks-and-partition does not work "
1098 "on this architecture");
1099 flag_reorder_blocks_and_partition = 0;
1100 flag_reorder_blocks = 1;
1103 /* Pipelining of outer loops is only possible when general pipelining
1104 capabilities are requested. */
1105 if (!flag_sel_sched_pipelining)
1106 flag_sel_sched_pipelining_outer_loops = 0;
1108 if (!targetm.ira_cover_classes
1109 && flag_ira_algorithm == IRA_ALGORITHM_CB)
1111 inform (input_location,
1112 "-fira-algorithm=CB does not work on this architecture");
1113 flag_ira_algorithm = IRA_ALGORITHM_PRIORITY;
1116 if (flag_conserve_stack)
1118 maybe_set_param_value (PARAM_LARGE_STACK_FRAME, 100,
1119 opts->x_param_values, opts_set->x_param_values);
1120 maybe_set_param_value (PARAM_STACK_FRAME_GROWTH, 40,
1121 opts->x_param_values, opts_set->x_param_values);
1123 if (flag_wpa || flag_ltrans)
1125 /* These passes are not WHOPR compatible yet. */
1127 flag_ipa_struct_reorg = 0;
1130 if (flag_lto || flag_whopr)
1133 flag_generate_lto = 1;
1135 /* When generating IL, do not operate in whole-program mode.
1136 Otherwise, symbols will be privatized too early, causing link
1138 flag_whole_program = 0;
1140 error ("LTO support has not been enabled in this configuration");
1143 if (flag_lto_partition_balanced || flag_lto_partition_1to1)
1145 if (flag_lto_partition_balanced && flag_lto_partition_1to1)
1146 error ("Only one -flto-partitoin value can be specified");
1148 error ("-flto-partitoin has effect only with -fwhopr");
1151 /* Reconcile -flto and -fwhopr. Set additional flags as appropriate and
1152 check option consistency. */
1153 if (flag_lto && flag_whopr)
1154 error ("-flto and -fwhopr are mutually exclusive");
1156 /* We initialize flag_split_stack to -1 so that targets can set a
1157 default value if they choose based on other options. */
1158 if (flag_split_stack == -1)
1159 flag_split_stack = 0;
1160 else if (flag_split_stack)
1162 if (!targetm.supports_split_stack (true))
1164 error ("%<-fsplit-stack%> is not supported by "
1165 "this compiler configuration");
1166 flag_split_stack = 0;
1171 #define LEFT_COLUMN 27
1173 /* Output ITEM, of length ITEM_WIDTH, in the left column,
1174 followed by word-wrapped HELP in a second column. */
1176 wrap_help (const char *help,
1178 unsigned int item_width,
1179 unsigned int columns)
1181 unsigned int col_width = LEFT_COLUMN;
1182 unsigned int remaining, room, len;
1184 remaining = strlen (help);
1188 room = columns - 3 - MAX (col_width, item_width);
1197 for (i = 0; help[i]; i++)
1199 if (i >= room && len != remaining)
1203 else if ((help[i] == '-' || help[i] == '/')
1204 && help[i + 1] != ' '
1205 && i > 0 && ISALPHA (help[i - 1]))
1210 printf( " %-*.*s %.*s\n", col_width, item_width, item, len, help);
1212 while (help[len] == ' ')
1220 /* Print help for a specific front-end, etc. */
1222 print_filtered_help (unsigned int include_flags,
1223 unsigned int exclude_flags,
1224 unsigned int any_flags,
1225 unsigned int columns)
1229 static char *printed = NULL;
1231 bool displayed = false;
1233 if (include_flags == CL_PARAMS)
1235 for (i = 0; i < LAST_PARAM; i++)
1237 const char *param = compiler_params[i].option;
1239 help = compiler_params[i].help;
1240 if (help == NULL || *help == '\0')
1242 if (exclude_flags & CL_UNDOCUMENTED)
1244 help = undocumented_msg;
1247 /* Get the translation. */
1250 wrap_help (help, param, strlen (param), columns);
1257 printed = XCNEWVAR (char, cl_options_count);
1259 for (i = 0; i < cl_options_count; i++)
1261 static char new_help[128];
1262 const struct cl_option *option = cl_options + i;
1267 if (include_flags == 0
1268 || ((option->flags & include_flags) != include_flags))
1270 if ((option->flags & any_flags) == 0)
1274 /* Skip unwanted switches. */
1275 if ((option->flags & exclude_flags) != 0)
1278 /* The driver currently prints its own help text. */
1279 if ((option->flags & CL_DRIVER) != 0
1280 && (option->flags & (((1U << cl_lang_count) - 1)
1281 | CL_COMMON | CL_TARGET)) == 0)
1285 /* Skip switches that have already been printed. */
1291 help = option->help;
1294 if (exclude_flags & CL_UNDOCUMENTED)
1296 help = undocumented_msg;
1299 /* Get the translation. */
1302 /* Find the gap between the name of the
1303 option and its descriptive text. */
1304 tab = strchr (help, '\t');
1313 opt = option->opt_text;
1317 /* With the -Q option enabled we change the descriptive text associated
1318 with an option to be an indication of its current setting. */
1321 void *flag_var = option_flag_var (i, &global_options);
1323 if (len < (LEFT_COLUMN + 2))
1324 strcpy (new_help, "\t\t");
1326 strcpy (new_help, "\t");
1328 if (flag_var != NULL)
1330 if (option->flags & CL_JOINED)
1332 if (option->var_type == CLVC_STRING)
1334 if (* (const char **) flag_var != NULL)
1335 snprintf (new_help + strlen (new_help),
1336 sizeof (new_help) - strlen (new_help),
1337 * (const char **) flag_var);
1340 sprintf (new_help + strlen (new_help),
1341 "%#x", * (int *) flag_var);
1344 strcat (new_help, option_enabled (i, &global_options)
1345 ? _("[enabled]") : _("[disabled]"));
1351 wrap_help (help, opt, len, columns);
1357 unsigned int langs = include_flags & CL_LANG_ALL;
1360 printf (_(" No options with the desired characteristics were found\n"));
1365 /* PR 31349: Tell the user how to see all of the
1366 options supported by a specific front end. */
1367 for (i = 0; (1U << i) < CL_LANG_ALL; i ++)
1368 if ((1U << i) & langs)
1369 printf (_(" None found. Use --help=%s to show *all* the options supported by the %s front-end\n"),
1370 lang_names[i], lang_names[i]);
1374 else if (! displayed)
1375 printf (_(" All options with the desired characteristics have already been displayed\n"));
1380 /* Display help for a specified type of option.
1381 The options must have ALL of the INCLUDE_FLAGS set
1382 ANY of the flags in the ANY_FLAGS set
1383 and NONE of the EXCLUDE_FLAGS set. */
1385 print_specific_help (unsigned int include_flags,
1386 unsigned int exclude_flags,
1387 unsigned int any_flags)
1389 unsigned int all_langs_mask = (1U << cl_lang_count) - 1;
1390 const char * description = NULL;
1391 const char * descrip_extra = "";
1394 static unsigned int columns = 0;
1396 /* Sanity check: Make sure that we do not have more
1397 languages than we have bits available to enumerate them. */
1398 gcc_assert ((1U << cl_lang_count) < CL_MIN_OPTION_CLASS);
1400 /* If we have not done so already, obtain
1401 the desired maximum width of the output. */
1406 GET_ENVIRONMENT (p, "COLUMNS");
1409 int value = atoi (p);
1416 /* Use a reasonable default. */
1420 /* Decide upon the title for the options that we are going to display. */
1421 for (i = 0, flag = 1; flag <= CL_MAX_OPTION_CLASS; flag <<= 1, i ++)
1423 switch (flag & include_flags)
1430 description = _("The following options are target specific");
1433 description = _("The following options control compiler warning messages");
1435 case CL_OPTIMIZATION:
1436 description = _("The following options control optimizations");
1439 description = _("The following options are language-independent");
1442 description = _("The --param option recognizes the following as parameters");
1445 if (i >= cl_lang_count)
1447 if (exclude_flags & all_langs_mask)
1448 description = _("The following options are specific to just the language ");
1450 description = _("The following options are supported by the language ");
1451 descrip_extra = lang_names [i];
1456 if (description == NULL)
1460 if (include_flags & CL_UNDOCUMENTED)
1461 description = _("The following options are not documented");
1462 else if (include_flags & CL_SEPARATE)
1463 description = _("The following options take separate arguments");
1464 else if (include_flags & CL_JOINED)
1465 description = _("The following options take joined arguments");
1468 internal_error ("unrecognized include_flags 0x%x passed to print_specific_help",
1475 if (any_flags & all_langs_mask)
1476 description = _("The following options are language-related");
1478 description = _("The following options are language-independent");
1482 printf ("%s%s:\n", description, descrip_extra);
1483 print_filtered_help (include_flags, exclude_flags, any_flags, columns);
1486 /* Handle target- and language-independent options. Return zero to
1487 generate an "unknown option" message. Only options that need
1488 extra handling need to be listed here; if you simply want
1489 DECODED->value assigned to a variable, it happens automatically. */
1492 common_handle_option (struct gcc_options *opts,
1493 struct gcc_options *opts_set,
1494 const struct cl_decoded_option *decoded,
1495 unsigned int lang_mask, int kind ATTRIBUTE_UNUSED,
1496 const struct cl_option_handlers *handlers)
1498 size_t scode = decoded->opt_index;
1499 const char *arg = decoded->arg;
1500 int value = decoded->value;
1501 static bool verbose = false;
1502 enum opt_code code = (enum opt_code) scode;
1504 gcc_assert (opts == &global_options);
1505 gcc_assert (opts_set == &global_options_set);
1506 gcc_assert (decoded->canonical_option_num_elements <= 2);
1511 handle_param (opts, opts_set, arg);
1520 unsigned int all_langs_mask = (1U << cl_lang_count) - 1;
1521 unsigned int undoc_mask;
1524 undoc_mask = (verbose | extra_warnings) ? 0 : CL_UNDOCUMENTED;
1525 /* First display any single language specific options. */
1526 for (i = 0; i < cl_lang_count; i++)
1528 (1U << i, (all_langs_mask & (~ (1U << i))) | undoc_mask, 0);
1529 /* Next display any multi language specific options. */
1530 print_specific_help (0, undoc_mask, all_langs_mask);
1531 /* Then display any remaining, non-language options. */
1532 for (i = CL_MIN_OPTION_CLASS; i <= CL_MAX_OPTION_CLASS; i <<= 1)
1534 print_specific_help (i, undoc_mask, 0);
1535 exit_after_options = true;
1539 case OPT__target_help:
1540 print_specific_help (CL_TARGET, CL_UNDOCUMENTED, 0);
1541 exit_after_options = true;
1543 /* Allow the target a chance to give the user some additional information. */
1550 const char * a = arg;
1551 unsigned int include_flags = 0;
1552 /* Note - by default we include undocumented options when listing
1553 specific classes. If you only want to see documented options
1554 then add ",^undocumented" to the --help= option. E.g.:
1556 --help=target,^undocumented */
1557 unsigned int exclude_flags = 0;
1559 /* Walk along the argument string, parsing each word in turn.
1561 arg = [^]{word}[,{arg}]
1562 word = {optimizers|target|warnings|undocumented|
1563 params|common|<language>} */
1568 const char * string;
1573 { "optimizers", CL_OPTIMIZATION },
1574 { "target", CL_TARGET },
1575 { "warnings", CL_WARNING },
1576 { "undocumented", CL_UNDOCUMENTED },
1577 { "params", CL_PARAMS },
1578 { "joined", CL_JOINED },
1579 { "separate", CL_SEPARATE },
1580 { "common", CL_COMMON },
1583 unsigned int * pflags;
1585 unsigned int lang_flag, specific_flag;
1592 pflags = & exclude_flags;
1595 pflags = & include_flags;
1597 comma = strchr (a, ',');
1608 /* Check to see if the string matches an option class name. */
1609 for (i = 0, specific_flag = 0; specifics[i].string != NULL; i++)
1610 if (strncasecmp (a, specifics[i].string, len) == 0)
1612 specific_flag = specifics[i].flag;
1616 /* Check to see if the string matches a language name.
1617 Note - we rely upon the alpha-sorted nature of the entries in
1618 the lang_names array, specifically that shorter names appear
1619 before their longer variants. (i.e. C before C++). That way
1620 when we are attempting to match --help=c for example we will
1621 match with C first and not C++. */
1622 for (i = 0, lang_flag = 0; i < cl_lang_count; i++)
1623 if (strncasecmp (a, lang_names[i], len) == 0)
1625 lang_flag = 1U << i;
1629 if (specific_flag != 0)
1632 * pflags |= specific_flag;
1635 /* The option's argument matches both the start of a
1636 language name and the start of an option class name.
1637 We have a special case for when the user has
1638 specified "--help=c", but otherwise we have to issue
1640 if (strncasecmp (a, "c", len) == 0)
1641 * pflags |= lang_flag;
1644 "warning: --help argument %.*s is ambiguous, please be more specific\n",
1648 else if (lang_flag != 0)
1649 * pflags |= lang_flag;
1652 "warning: unrecognized argument to --help= option: %.*s\n",
1661 print_specific_help (include_flags, exclude_flags, 0);
1662 exit_after_options = true;
1667 exit_after_options = true;
1673 /* Currently handled in a prescan. */
1677 enable_warning_as_error (arg, value, lang_mask, handlers, global_dc);
1680 case OPT_Wlarger_than_:
1681 larger_than_size = value;
1682 warn_larger_than = value != -1;
1685 case OPT_Wfatal_errors:
1686 global_dc->fatal_errors = value;
1689 case OPT_Wframe_larger_than_:
1690 frame_larger_than_size = value;
1691 warn_frame_larger_than = value != -1;
1694 case OPT_Wstrict_aliasing:
1695 set_Wstrict_aliasing (value);
1698 case OPT_Wstrict_aliasing_:
1699 warn_strict_aliasing = value;
1702 case OPT_Wstrict_overflow:
1703 warn_strict_overflow = (value
1704 ? (int) WARN_STRICT_OVERFLOW_CONDITIONAL
1708 case OPT_Wstrict_overflow_:
1709 warn_strict_overflow = value;
1712 case OPT_Wsystem_headers:
1713 global_dc->dc_warn_system_headers = value;
1717 warn_unused = value;
1721 aux_info_file_name = arg;
1722 flag_gen_aux_info = 1;
1726 aux_base_name = arg;
1729 case OPT_auxbase_strip:
1731 char *tmp = xstrdup (arg);
1732 strip_off_ending (tmp, strlen (tmp));
1734 aux_base_name = tmp;
1739 decode_d_option (arg);
1743 dump_base_name = arg;
1747 dump_dir_name = arg;
1750 case OPT_falign_functions_:
1751 align_functions = value;
1754 case OPT_falign_jumps_:
1755 align_jumps = value;
1758 case OPT_falign_labels_:
1759 align_labels = value;
1762 case OPT_falign_loops_:
1763 align_loops = value;
1766 case OPT_fcall_used_:
1767 fix_register (arg, 0, 1);
1770 case OPT_fcall_saved_:
1771 fix_register (arg, 0, 0);
1774 case OPT_fcompare_debug_second:
1775 flag_compare_debug = value;
1779 dbg_cnt_process_opt (arg);
1782 case OPT_fdbg_cnt_list:
1783 dbg_cnt_list_all_counters ();
1786 case OPT_fdebug_prefix_map_:
1787 add_debug_prefix_map (arg);
1790 case OPT_fdiagnostics_show_location_:
1791 if (!strcmp (arg, "once"))
1792 diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
1793 else if (!strcmp (arg, "every-line"))
1794 diagnostic_prefixing_rule (global_dc)
1795 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE;
1800 case OPT_fdiagnostics_show_option:
1801 global_dc->show_option_requested = value;
1805 if (!dump_switch_p (arg))
1809 case OPT_fexcess_precision_:
1810 if (!strcmp (arg, "fast"))
1811 flag_excess_precision_cmdline = EXCESS_PRECISION_FAST;
1812 else if (!strcmp (arg, "standard"))
1813 flag_excess_precision_cmdline = EXCESS_PRECISION_STANDARD;
1815 error ("unknown excess precision style \"%s\"", arg);
1818 case OPT_ffast_math:
1819 set_fast_math_flags (value);
1822 case OPT_funsafe_math_optimizations:
1823 set_unsafe_math_optimizations_flags (value);
1827 fix_register (arg, 1, 1);
1830 case OPT_finline_limit_:
1831 set_param_value ("max-inline-insns-single", value / 2,
1832 opts->x_param_values, opts_set->x_param_values);
1833 set_param_value ("max-inline-insns-auto", value / 2,
1834 opts->x_param_values, opts_set->x_param_values);
1837 case OPT_finstrument_functions_exclude_function_list_:
1838 add_comma_separated_to_vector
1839 (&flag_instrument_functions_exclude_functions, arg);
1842 case OPT_finstrument_functions_exclude_file_list_:
1843 add_comma_separated_to_vector
1844 (&flag_instrument_functions_exclude_files, arg);
1847 case OPT_fmessage_length_:
1848 pp_set_line_maximum_length (global_dc->printer, value);
1851 case OPT_fpack_struct_:
1852 if (value <= 0 || (value & (value - 1)) || value > 16)
1853 error ("structure alignment must be a small power of two, not %d", value);
1856 initial_max_fld_align = value;
1857 maximum_field_alignment = value * BITS_PER_UNIT;
1862 #ifdef ENABLE_PLUGIN
1863 add_new_plugin (arg);
1865 error ("Plugin support is disabled. Configure with --enable-plugin.");
1869 case OPT_fplugin_arg_:
1870 #ifdef ENABLE_PLUGIN
1871 parse_plugin_arg_opt (arg);
1873 error ("Plugin support is disabled. Configure with --enable-plugin.");
1877 case OPT_fprofile_dir_:
1878 profile_data_prefix = xstrdup (arg);
1881 case OPT_fprofile_use_:
1882 profile_data_prefix = xstrdup (arg);
1883 flag_profile_use = true;
1885 /* No break here - do -fprofile-use processing. */
1886 case OPT_fprofile_use:
1887 if (!opts_set->x_flag_branch_probabilities)
1888 flag_branch_probabilities = value;
1889 if (!opts_set->x_flag_profile_values)
1890 flag_profile_values = value;
1891 if (!opts_set->x_flag_unroll_loops)
1892 flag_unroll_loops = value;
1893 if (!opts_set->x_flag_peel_loops)
1894 flag_peel_loops = value;
1895 if (!opts_set->x_flag_tracer)
1896 flag_tracer = value;
1897 if (!opts_set->x_flag_value_profile_transformations)
1898 flag_value_profile_transformations = value;
1899 if (!opts_set->x_flag_inline_functions)
1900 flag_inline_functions = value;
1901 if (!opts_set->x_flag_ipa_cp)
1902 flag_ipa_cp = value;
1903 if (!opts_set->x_flag_ipa_cp_clone
1904 && value && flag_ipa_cp)
1905 flag_ipa_cp_clone = value;
1906 if (!opts_set->x_flag_predictive_commoning)
1907 flag_predictive_commoning = value;
1908 if (!opts_set->x_flag_unswitch_loops)
1909 flag_unswitch_loops = value;
1910 if (!opts_set->x_flag_gcse_after_reload)
1911 flag_gcse_after_reload = value;
1914 case OPT_fprofile_generate_:
1915 profile_data_prefix = xstrdup (arg);
1917 /* No break here - do -fprofile-generate processing. */
1918 case OPT_fprofile_generate:
1919 if (!opts_set->x_profile_arc_flag)
1920 profile_arc_flag = value;
1921 if (!opts_set->x_flag_profile_values)
1922 flag_profile_values = value;
1923 if (!opts_set->x_flag_value_profile_transformations)
1924 flag_value_profile_transformations = value;
1925 if (!opts_set->x_flag_inline_functions)
1926 flag_inline_functions = value;
1929 case OPT_fshow_column:
1930 global_dc->show_column = value;
1933 case OPT_fvisibility_:
1935 if (!strcmp(arg, "default"))
1936 default_visibility = VISIBILITY_DEFAULT;
1937 else if (!strcmp(arg, "internal"))
1938 default_visibility = VISIBILITY_INTERNAL;
1939 else if (!strcmp(arg, "hidden"))
1940 default_visibility = VISIBILITY_HIDDEN;
1941 else if (!strcmp(arg, "protected"))
1942 default_visibility = VISIBILITY_PROTECTED;
1944 error ("unrecognized visibility value \"%s\"", arg);
1948 case OPT_frandom_seed:
1949 /* The real switch is -fno-random-seed. */
1952 set_random_seed (NULL);
1955 case OPT_frandom_seed_:
1956 set_random_seed (arg);
1959 case OPT_fsched_verbose_:
1960 #ifdef INSN_SCHEDULING
1961 fix_sched_param ("verbose", arg);
1967 case OPT_fsched_stalled_insns_:
1968 flag_sched_stalled_insns = value;
1969 if (flag_sched_stalled_insns == 0)
1970 flag_sched_stalled_insns = -1;
1973 case OPT_fsched_stalled_insns_dep_:
1974 flag_sched_stalled_insns_dep = value;
1977 case OPT_fstack_check_:
1978 if (!strcmp (arg, "no"))
1979 flag_stack_check = NO_STACK_CHECK;
1980 else if (!strcmp (arg, "generic"))
1981 /* This is the old stack checking method. */
1982 flag_stack_check = STACK_CHECK_BUILTIN
1983 ? FULL_BUILTIN_STACK_CHECK
1984 : GENERIC_STACK_CHECK;
1985 else if (!strcmp (arg, "specific"))
1986 /* This is the new stack checking method. */
1987 flag_stack_check = STACK_CHECK_BUILTIN
1988 ? FULL_BUILTIN_STACK_CHECK
1989 : STACK_CHECK_STATIC_BUILTIN
1990 ? STATIC_BUILTIN_STACK_CHECK
1991 : GENERIC_STACK_CHECK;
1993 warning (0, "unknown stack check parameter \"%s\"", arg);
1996 case OPT_fstack_limit:
1997 /* The real switch is -fno-stack-limit. */
2000 stack_limit_rtx = NULL_RTX;
2003 case OPT_fstack_limit_register_:
2005 int reg = decode_reg_name (arg);
2007 error ("unrecognized register name \"%s\"", arg);
2009 stack_limit_rtx = gen_rtx_REG (Pmode, reg);
2013 case OPT_fstack_limit_symbol_:
2014 stack_limit_rtx = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (arg));
2017 case OPT_ftree_vectorizer_verbose_:
2018 vect_set_verbosity_level (arg);
2021 case OPT_ftls_model_:
2022 if (!strcmp (arg, "global-dynamic"))
2023 flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC;
2024 else if (!strcmp (arg, "local-dynamic"))
2025 flag_tls_default = TLS_MODEL_LOCAL_DYNAMIC;
2026 else if (!strcmp (arg, "initial-exec"))
2027 flag_tls_default = TLS_MODEL_INITIAL_EXEC;
2028 else if (!strcmp (arg, "local-exec"))
2029 flag_tls_default = TLS_MODEL_LOCAL_EXEC;
2031 warning (0, "unknown tls-model \"%s\"", arg);
2034 case OPT_fira_algorithm_:
2035 if (!strcmp (arg, "CB"))
2036 flag_ira_algorithm = IRA_ALGORITHM_CB;
2037 else if (!strcmp (arg, "priority"))
2038 flag_ira_algorithm = IRA_ALGORITHM_PRIORITY;
2040 warning (0, "unknown ira algorithm \"%s\"", arg);
2043 case OPT_fira_region_:
2044 if (!strcmp (arg, "one"))
2045 flag_ira_region = IRA_REGION_ONE;
2046 else if (!strcmp (arg, "all"))
2047 flag_ira_region = IRA_REGION_ALL;
2048 else if (!strcmp (arg, "mixed"))
2049 flag_ira_region = IRA_REGION_MIXED;
2051 warning (0, "unknown ira region \"%s\"", arg);
2054 case OPT_fira_verbose_:
2055 flag_ira_verbose = value;
2059 set_debug_level (NO_DEBUG, DEFAULT_GDB_EXTENSIONS, arg);
2063 set_debug_level (SDB_DEBUG, false, arg);
2067 if (value < 2 || value > 4)
2068 error ("dwarf version %d is not supported", value);
2070 dwarf_version = value;
2071 set_debug_level (DWARF2_DEBUG, false, "");
2075 set_debug_level (NO_DEBUG, 2, arg);
2080 set_debug_level (DBX_DEBUG, code == OPT_gstabs_, arg);
2084 set_debug_level (VMS_DEBUG, false, arg);
2089 set_debug_level (XCOFF_DEBUG, code == OPT_gxcoff_, arg);
2093 asm_file_name = arg;
2096 case OPT_pedantic_errors:
2097 flag_pedantic_errors = pedantic = 1;
2098 global_dc->pedantic_errors = 1;
2110 global_dc->dc_inhibit_warnings = true;
2113 case OPT_fuse_linker_plugin:
2114 /* No-op. Used by the driver and passed to us because it starts with f.*/
2118 /* If the flag was handled in a standard way, assume the lack of
2119 processing here is intentional. */
2120 gcc_assert (option_flag_var (scode, opts));
2127 /* Handle --param NAME=VALUE. */
2129 handle_param (struct gcc_options *opts, struct gcc_options *opts_set,
2135 arg = xstrdup (carg);
2136 equal = strchr (arg, '=');
2138 error ("%s: --param arguments should be of the form NAME=VALUE", arg);
2141 value = integral_argument (equal + 1);
2143 error ("invalid --param value %qs", equal + 1);
2147 set_param_value (arg, value,
2148 opts->x_param_values, opts_set->x_param_values);
2155 /* Used to set the level of strict aliasing warnings,
2156 when no level is specified (i.e., when -Wstrict-aliasing, and not
2157 -Wstrict-aliasing=level was given).
2158 ONOFF is assumed to take value 1 when -Wstrict-aliasing is specified,
2159 and 0 otherwise. After calling this function, wstrict_aliasing will be
2160 set to the default value of -Wstrict_aliasing=level, currently 3. */
2162 set_Wstrict_aliasing (int onoff)
2164 gcc_assert (onoff == 0 || onoff == 1);
2166 warn_strict_aliasing = 3;
2168 warn_strict_aliasing = 0;
2171 /* The following routines are useful in setting all the flags that
2172 -ffast-math and -fno-fast-math imply. */
2174 set_fast_math_flags (int set)
2176 flag_unsafe_math_optimizations = set;
2177 set_unsafe_math_optimizations_flags (set);
2178 flag_finite_math_only = set;
2179 flag_errno_math = !set;
2182 flag_signaling_nans = 0;
2183 flag_rounding_math = 0;
2184 flag_cx_limited_range = 1;
2188 /* When -funsafe-math-optimizations is set the following
2189 flags are set as well. */
2191 set_unsafe_math_optimizations_flags (int set)
2193 flag_trapping_math = !set;
2194 flag_signed_zeros = !set;
2195 flag_associative_math = set;
2196 flag_reciprocal_math = set;
2199 /* Return true iff flags are set as if -ffast-math. */
2201 fast_math_flags_set_p (void)
2203 return (!flag_trapping_math
2204 && flag_unsafe_math_optimizations
2205 && flag_finite_math_only
2206 && !flag_signed_zeros
2207 && !flag_errno_math);
2210 /* Return true iff flags are set as if -ffast-math but using the flags stored
2211 in the struct cl_optimization structure. */
2213 fast_math_flags_struct_set_p (struct cl_optimization *opt)
2215 return (!opt->x_flag_trapping_math
2216 && opt->x_flag_unsafe_math_optimizations
2217 && opt->x_flag_finite_math_only
2218 && !opt->x_flag_signed_zeros
2219 && !opt->x_flag_errno_math);
2222 /* Handle a debug output -g switch. EXTENDED is true or false to support
2223 extended output (2 is special and means "-ggdb" was given). */
2225 set_debug_level (enum debug_info_type type, int extended, const char *arg)
2227 static bool type_explicit;
2229 use_gnu_debug_info_extensions = extended;
2231 if (type == NO_DEBUG)
2233 if (write_symbols == NO_DEBUG)
2235 write_symbols = PREFERRED_DEBUGGING_TYPE;
2239 #ifdef DWARF2_DEBUGGING_INFO
2240 write_symbols = DWARF2_DEBUG;
2241 #elif defined DBX_DEBUGGING_INFO
2242 write_symbols = DBX_DEBUG;
2246 if (write_symbols == NO_DEBUG)
2247 warning (0, "target system does not support debug output");
2252 /* Does it conflict with an already selected type? */
2253 if (type_explicit && write_symbols != NO_DEBUG && type != write_symbols)
2254 error ("debug format \"%s\" conflicts with prior selection",
2255 debug_type_names[type]);
2256 write_symbols = type;
2257 type_explicit = true;
2260 /* A debug flag without a level defaults to level 2. */
2263 if (!debug_info_level)
2264 debug_info_level = DINFO_LEVEL_NORMAL;
2268 int argval = integral_argument (arg);
2270 error ("unrecognised debug output level \"%s\"", arg);
2271 else if (argval > 3)
2272 error ("debug output level %s is too high", arg);
2274 debug_info_level = (enum debug_info_level) argval;
2278 /* Return 1 if option OPT_IDX is enabled in OPTS, 0 if it is disabled,
2279 or -1 if it isn't a simple on-off switch. */
2282 option_enabled (int opt_idx, void *opts)
2284 const struct cl_option *option = &(cl_options[opt_idx]);
2285 struct gcc_options *optsg = (struct gcc_options *) opts;
2286 void *flag_var = option_flag_var (opt_idx, optsg);
2289 switch (option->var_type)
2292 return *(int *) flag_var != 0;
2295 return *(int *) flag_var == option->var_value;
2297 case CLVC_BIT_CLEAR:
2298 return (*(int *) flag_var & option->var_value) == 0;
2301 return (*(int *) flag_var & option->var_value) != 0;
2309 /* Fill STATE with the current state of option OPTION in OPTS. Return
2310 true if there is some state to store. */
2313 get_option_state (struct gcc_options *opts, int option,
2314 struct cl_option_state *state)
2316 void *flag_var = option_flag_var (option, opts);
2321 switch (cl_options[option].var_type)
2325 state->data = flag_var;
2326 state->size = sizeof (int);
2329 case CLVC_BIT_CLEAR:
2331 state->ch = option_enabled (option, opts);
2332 state->data = &state->ch;
2337 state->data = *(const char **) flag_var;
2338 if (state->data == 0)
2340 state->size = strlen ((const char *) state->data) + 1;
2346 /* Callback function, called when -Werror= enables a warning. */
2348 static void (*warning_as_error_callback) (int) = NULL;
2350 /* Register a callback for enable_warning_as_error calls. */
2353 register_warning_as_error_callback (void (*callback) (int))
2355 gcc_assert (warning_as_error_callback == NULL || callback == NULL);
2356 warning_as_error_callback = callback;
2359 /* Enable (or disable if VALUE is 0) a warning option ARG (language
2360 mask LANG_MASK, option handlers HANDLERS) as an error for
2361 diagnostic context DC (possibly NULL). This is used by
2365 enable_warning_as_error (const char *arg, int value, unsigned int lang_mask,
2366 const struct cl_option_handlers *handlers,
2367 diagnostic_context *dc)
2372 new_option = XNEWVEC (char, strlen (arg) + 2);
2373 new_option[0] = 'W';
2374 strcpy (new_option + 1, arg);
2375 option_index = find_opt (new_option, lang_mask);
2376 if (option_index == OPT_SPECIAL_unknown)
2378 error ("-Werror=%s: No option -%s", arg, new_option);
2382 const struct cl_option *option = &cl_options[option_index];
2383 const diagnostic_t kind = value ? DK_ERROR : DK_WARNING;
2385 if (option->alias_target != N_OPTS)
2386 option_index = option->alias_target;
2387 if (option_index == OPT_SPECIAL_ignore)
2390 diagnostic_classify_diagnostic (dc, option_index, kind,
2392 if (kind == DK_ERROR)
2394 const struct cl_option * const option = cl_options + option_index;
2396 /* -Werror=foo implies -Wfoo. */
2397 if (option->var_type == CLVC_BOOLEAN)
2398 handle_generated_option (&global_options, &global_options_set,
2399 option_index, NULL, value, lang_mask,
2400 (int)kind, handlers,
2403 if (warning_as_error_callback)
2404 warning_as_error_callback (option_index);
2410 /* Return malloced memory for the name of the option OPTION_INDEX
2411 which enabled a diagnostic (context CONTEXT), originally of type
2412 ORIG_DIAG_KIND but possibly converted to DIAG_KIND by options such
2416 option_name (diagnostic_context *context, int option_index,
2417 diagnostic_t orig_diag_kind, diagnostic_t diag_kind)
2421 /* A warning classified as an error. */
2422 if ((orig_diag_kind == DK_WARNING || orig_diag_kind == DK_PEDWARN)
2423 && diag_kind == DK_ERROR)
2424 return concat (cl_options[OPT_Werror_].opt_text,
2425 /* Skip over "-W". */
2426 cl_options[option_index].opt_text + 2,
2428 /* A warning with option. */
2430 return xstrdup (cl_options[option_index].opt_text);
2432 /* A warning without option classified as an error. */
2433 else if (orig_diag_kind == DK_WARNING || orig_diag_kind == DK_PEDWARN
2434 || diag_kind == DK_WARNING)
2436 if (context->warning_as_error_requested)
2437 return xstrdup (cl_options[OPT_Werror].opt_text);
2439 return xstrdup (_("enabled by default"));