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 (const char *);
366 static char *write_langs (unsigned int lang_mask);
367 static void complain_wrong_lang (const struct cl_decoded_option *,
368 unsigned int lang_mask);
369 static void set_debug_level (enum debug_info_type type, int extended,
372 /* Return a malloced slash-separated list of languages in MASK. */
374 write_langs (unsigned int mask)
376 unsigned int n = 0, len = 0;
377 const char *lang_name;
380 for (n = 0; (lang_name = lang_names[n]) != 0; n++)
381 if (mask & (1U << n))
382 len += strlen (lang_name) + 1;
384 result = XNEWVEC (char, len);
386 for (n = 0; (lang_name = lang_names[n]) != 0; n++)
387 if (mask & (1U << n))
391 strcpy (result + len, lang_name);
392 len += strlen (lang_name);
400 /* Complain that switch DECODED does not apply to this front end (mask
403 complain_wrong_lang (const struct cl_decoded_option *decoded,
404 unsigned int lang_mask)
406 const struct cl_option *option = &cl_options[decoded->opt_index];
407 const char *text = decoded->orig_option_with_args_text;
408 char *ok_langs = NULL, *bad_lang = NULL;
409 unsigned int opt_flags = option->flags;
411 if (!lang_hooks.complain_wrong_lang_p (option))
414 opt_flags &= ((1U << cl_lang_count) - 1) | CL_DRIVER;
415 if (opt_flags != CL_DRIVER)
416 ok_langs = write_langs (opt_flags);
417 if (lang_mask != CL_DRIVER)
418 bad_lang = write_langs (lang_mask);
420 if (opt_flags == CL_DRIVER)
421 error ("command line option %qs is valid for the driver but not for %s",
423 else if (lang_mask == CL_DRIVER)
426 /* Eventually this should become a hard error IMO. */
427 warning (0, "command line option %qs is valid for %s but not for %s",
428 text, ok_langs, bad_lang);
434 /* Buffer the unknown option described by the string OPT. Currently,
435 we only complain about unknown -Wno-* options if they may have
436 prevented a diagnostic. Otherwise, we just ignore them.
437 Note that if we do complain, it is only as a warning, not an error;
438 passing the compiler an unrecognised -Wno-* option should never
439 change whether the compilation succeeds or fails. */
441 static void postpone_unknown_option_warning(const char *opt)
443 VEC_safe_push (const_char_p, heap, ignored_options, opt);
446 /* Produce a warning for each option previously buffered. */
448 void print_ignored_options (void)
450 location_t saved_loc = input_location;
454 while (!VEC_empty (const_char_p, ignored_options))
457 opt = VEC_pop (const_char_p, ignored_options);
458 warning (0, "unrecognized command line option \"%s\"", opt);
461 input_location = saved_loc;
464 /* Handle an unknown option DECODED, returning true if an error should be
468 unknown_option_callback (const struct cl_decoded_option *decoded)
470 const char *opt = decoded->arg;
472 if (opt[1] == 'W' && opt[2] == 'n' && opt[3] == 'o' && opt[4] == '-'
473 && !(decoded->errors & CL_ERR_NEGATIVE))
475 /* We don't generate warnings for unknown -Wno-* options unless
476 we issue diagnostics. */
477 postpone_unknown_option_warning (opt);
484 /* Note that an option DECODED has been successfully handled with a
485 handler for mask MASK. */
488 post_handling_callback (const struct cl_decoded_option *decoded ATTRIBUTE_UNUSED,
489 unsigned int mask ATTRIBUTE_UNUSED)
492 lto_register_user_option (decoded->opt_index, decoded->arg,
493 decoded->value, mask);
497 /* Handle a front-end option; arguments and return value as for
501 lang_handle_option (struct gcc_options *opts,
502 struct gcc_options *opts_set,
503 const struct cl_decoded_option *decoded,
504 unsigned int lang_mask ATTRIBUTE_UNUSED, int kind,
505 const struct cl_option_handlers *handlers)
507 gcc_assert (opts == &global_options);
508 gcc_assert (opts_set == &global_options_set);
509 gcc_assert (decoded->canonical_option_num_elements <= 2);
510 return lang_hooks.handle_option (decoded->opt_index, decoded->arg,
511 decoded->value, kind, handlers);
514 /* Handle a back-end option; arguments and return value as for
518 target_handle_option (struct gcc_options *opts,
519 struct gcc_options *opts_set,
520 const struct cl_decoded_option *decoded,
521 unsigned int lang_mask ATTRIBUTE_UNUSED, int kind,
522 const struct cl_option_handlers *handlers ATTRIBUTE_UNUSED)
524 gcc_assert (opts == &global_options);
525 gcc_assert (opts_set == &global_options_set);
526 gcc_assert (decoded->canonical_option_num_elements <= 2);
527 gcc_assert (kind == DK_UNSPECIFIED);
528 return targetm.handle_option (decoded->opt_index, decoded->arg,
532 /* Handle FILENAME from the command line. */
534 add_input_filename (const char *filename)
537 in_fnames = XRESIZEVEC (const char *, in_fnames, num_in_fnames);
538 in_fnames[num_in_fnames - 1] = filename;
541 /* Add comma-separated strings to a char_p vector. */
544 add_comma_separated_to_vector (VEC(char_p,heap) **pvec, const char* arg)
551 /* We never free this string. */
564 VEC_safe_push (char_p, heap, *pvec, token_start);
567 if (*r == '\\' && r[1] == ',')
575 if (*token_start != '\0')
576 VEC_safe_push (char_p, heap, *pvec, token_start);
579 /* Return whether we should exclude FNDECL from instrumentation. */
582 flag_instrument_functions_exclude_p (tree fndecl)
584 if (VEC_length (char_p, flag_instrument_functions_exclude_functions) > 0)
590 name = lang_hooks.decl_printable_name (fndecl, 0);
591 FOR_EACH_VEC_ELT (char_p, flag_instrument_functions_exclude_functions,
593 if (strstr (name, s) != NULL)
597 if (VEC_length (char_p, flag_instrument_functions_exclude_files) > 0)
603 name = DECL_SOURCE_FILE (fndecl);
604 FOR_EACH_VEC_ELT (char_p, flag_instrument_functions_exclude_files, i, s)
605 if (strstr (name, s) != NULL)
613 /* Handle the vector of command line options, storing the results of
614 processing DECODED_OPTIONS and DECODED_OPTIONS_COUNT in OPTS and
615 OPTS_SET. LANG_MASK contains has a single bit set representing the
616 current language. HANDLERS describes what functions to call for
619 read_cmdline_options (struct gcc_options *opts, struct gcc_options *opts_set,
620 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 /* Input files should only ever appear on the main command
633 gcc_assert (opts == &global_options);
634 gcc_assert (opts_set == &global_options_set);
636 if (main_input_filename == NULL)
638 main_input_filename = decoded_options[i].arg;
639 main_input_baselength
640 = base_of_path (main_input_filename, &main_input_basename);
642 add_input_filename (decoded_options[i].arg);
646 read_cmdline_option (opts, opts_set,
647 decoded_options + i, lang_mask, handlers,
652 /* Language mask determined at initialization. */
653 static unsigned int initial_lang_mask;
655 /* Initial values of parameters we reset. */
656 static int initial_min_crossjump_insns;
657 static int initial_max_fields_for_field_sensitive;
658 static int initial_loop_invariant_max_bbs_in_loop;
660 /* Initialize global options-related settings at start-up. */
663 init_options_once (void)
665 /* Perform language-specific options initialization. */
666 initial_lang_mask = lang_hooks.option_lang_mask ();
668 lang_hooks.initialize_diagnostics (global_dc);
670 /* Save initial values of parameters we reset. */
671 initial_min_crossjump_insns
672 = compiler_params[PARAM_MIN_CROSSJUMP_INSNS].value;
673 initial_max_fields_for_field_sensitive
674 = compiler_params[PARAM_MAX_FIELDS_FOR_FIELD_SENSITIVE].value;
675 initial_loop_invariant_max_bbs_in_loop
676 = compiler_params[PARAM_LOOP_INVARIANT_MAX_BBS_IN_LOOP].value;
679 /* Initialize OPTS and OPTS_SET before using them in parsing options. */
682 init_options_struct (struct gcc_options *opts, struct gcc_options *opts_set)
684 *opts = global_options_init;
685 memset (opts_set, 0, sizeof (*opts_set));
687 /* Use priority coloring if cover classes is not defined for the
689 if (targetm.ira_cover_classes == NULL)
690 opts->x_flag_ira_algorithm = IRA_ALGORITHM_PRIORITY;
692 /* Initialize whether `char' is signed. */
693 opts->x_flag_signed_char = DEFAULT_SIGNED_CHAR;
694 /* Set this to a special "uninitialized" value. The actual default
695 is set after target options have been processed. */
696 opts->x_flag_short_enums = 2;
698 /* Initialize target_flags before targetm.target_option.optimization
699 so the latter can modify it. */
700 opts->x_target_flags = targetm.default_target_flags;
702 /* Some targets have ABI-specified unwind tables. */
703 opts->x_flag_unwind_tables = targetm.unwind_tables_default;
706 /* Decode command-line options to an array, like
707 decode_cmdline_options_to_array and with the same arguments but
708 using the default lang_mask. */
711 decode_cmdline_options_to_array_default_mask (unsigned int argc,
713 struct cl_decoded_option **decoded_options,
714 unsigned int *decoded_options_count)
716 decode_cmdline_options_to_array (argc, argv,
717 initial_lang_mask | CL_COMMON | CL_TARGET,
718 decoded_options, decoded_options_count);
721 /* Default the options in OPTS and OPTS_SET based on the optimization
722 settings in DECODED_OPTIONS and DECODED_OPTIONS_COUNT. */
724 default_options_optimization (struct gcc_options *opts,
725 struct gcc_options *opts_set,
726 struct cl_decoded_option *decoded_options,
727 unsigned int decoded_options_count)
736 gcc_assert (opts == &global_options);
737 gcc_assert (opts_set = &global_options_set);
739 /* Scan to see what optimization level has been specified. That will
740 determine the default value of many flags. */
741 for (i = 1; i < decoded_options_count; i++)
743 struct cl_decoded_option *opt = &decoded_options[i];
744 switch (opt->opt_index)
747 if (*opt->arg == '\0')
755 const int optimize_val = integral_argument (opt->arg);
756 if (optimize_val == -1)
757 error ("argument to %qs should be a non-negative integer",
761 optimize = optimize_val;
762 if ((unsigned int) optimize > 255)
773 /* Optimizing for size forces optimize to be 2. */
779 /* -Ofast only adds flags to -O3. */
786 /* Ignore other options in this prescan. */
791 /* -O1 optimizations. */
792 opt1 = (optimize >= 1);
793 flag_defer_pop = opt1;
795 flag_delayed_branch = opt1;
797 #ifdef CAN_DEBUG_WITHOUT_FP
798 flag_omit_frame_pointer = opt1;
800 flag_guess_branch_prob = opt1;
801 flag_cprop_registers = opt1;
802 flag_forward_propagate = opt1;
803 flag_if_conversion = opt1;
804 flag_if_conversion2 = opt1;
805 flag_ipa_pure_const = opt1;
806 flag_ipa_reference = opt1;
807 flag_ipa_profile = opt1;
808 flag_merge_constants = opt1;
809 flag_split_wide_types = opt1;
810 flag_tree_ccp = opt1;
811 flag_tree_bit_ccp = opt1;
812 flag_tree_dce = opt1;
813 flag_tree_dom = opt1;
814 flag_tree_dse = opt1;
815 flag_tree_ter = opt1;
816 flag_tree_sra = opt1;
817 flag_tree_copyrename = opt1;
818 flag_tree_fre = opt1;
819 flag_tree_copy_prop = opt1;
820 flag_tree_sink = opt1;
822 flag_combine_stack_adjustments = opt1;
824 /* -O2 optimizations. */
825 opt2 = (optimize >= 2);
826 flag_inline_small_functions = opt2;
827 flag_indirect_inlining = opt2;
828 flag_partial_inlining = opt2;
829 flag_thread_jumps = opt2;
830 flag_crossjumping = opt2;
831 flag_optimize_sibling_calls = opt2;
832 flag_cse_follow_jumps = opt2;
834 flag_expensive_optimizations = opt2;
835 flag_rerun_cse_after_loop = opt2;
836 flag_caller_saves = opt2;
837 flag_peephole2 = opt2;
838 #ifdef INSN_SCHEDULING
839 /* Only run the pre-regalloc scheduling pass if optimizing for speed. */
840 flag_schedule_insns = opt2 && ! optimize_size;
841 flag_schedule_insns_after_reload = opt2;
844 flag_strict_aliasing = opt2;
845 flag_strict_overflow = opt2;
846 flag_reorder_blocks = opt2;
847 flag_reorder_functions = opt2;
848 flag_tree_vrp = opt2;
849 flag_tree_builtin_call_dce = opt2;
850 flag_tree_pre = opt2;
851 flag_tree_switch_conversion = opt2;
855 /* Track fields in field-sensitive alias analysis. */
856 set_param_value ("max-fields-for-field-sensitive",
857 (opt2) ? 100 : initial_max_fields_for_field_sensitive);
859 /* For -O1 only do loop invariant motion for very small loops. */
860 set_param_value ("loop-invariant-max-bbs-in-loop",
861 (opt2) ? initial_loop_invariant_max_bbs_in_loop : 1000);
863 /* -O3 optimizations. */
864 opt3 = (optimize >= 3);
865 flag_tree_loop_distribute_patterns = opt3;
866 flag_predictive_commoning = opt3;
867 flag_inline_functions = opt3;
868 flag_unswitch_loops = opt3;
869 flag_gcse_after_reload = opt3;
870 flag_tree_vectorize = opt3;
871 flag_ipa_cp_clone = opt3;
872 if (flag_ipa_cp_clone)
875 /* Just -O1/-O0 optimizations. */
876 opt1_max = (optimize <= 1);
877 align_loops = opt1_max;
878 align_jumps = opt1_max;
879 align_labels = opt1_max;
880 align_functions = opt1_max;
884 /* Inlining of functions reducing size is a good idea regardless of them
885 being declared inline. */
886 flag_inline_functions = 1;
888 /* Basic optimization options. */
893 /* We want to crossjump as much as possible. */
894 set_param_value ("min-crossjump-insns", 1);
897 set_param_value ("min-crossjump-insns", initial_min_crossjump_insns);
899 /* -Ofast adds optimizations to -O3. */
902 /* Which is -ffast-math for now. */
903 set_fast_math_flags (1);
904 /* Allow targets to enable extra options with -Ofast
905 before general options processing so disabling them
906 again afterwards works. */
907 targetm.handle_ofast ();
910 /* Allow default optimizations to be specified on a per-machine basis. */
911 targetm.target_option.optimization (optimize, optimize_size);
914 static void finish_options (struct gcc_options *, struct gcc_options *);
916 /* Parse command line options and set default flag values. Do minimal
917 options processing. The decoded options are in *DECODED_OPTIONS
918 and *DECODED_OPTIONS_COUNT. */
920 decode_options (struct gcc_options *opts, struct gcc_options *opts_set,
921 struct cl_decoded_option *decoded_options,
922 unsigned int decoded_options_count)
924 struct cl_option_handlers handlers;
926 unsigned int lang_mask;
928 lang_mask = initial_lang_mask;
930 handlers.unknown_option_callback = unknown_option_callback;
931 handlers.wrong_lang_callback = complain_wrong_lang;
932 handlers.post_handling_callback = post_handling_callback;
933 handlers.num_handlers = 3;
934 handlers.handlers[0].handler = lang_handle_option;
935 handlers.handlers[0].mask = lang_mask;
936 handlers.handlers[1].handler = common_handle_option;
937 handlers.handlers[1].mask = CL_COMMON;
938 handlers.handlers[2].handler = target_handle_option;
939 handlers.handlers[2].mask = CL_TARGET;
941 /* Enable -Werror=coverage-mismatch by default */
942 enable_warning_as_error ("coverage-mismatch", 1, lang_mask, &handlers,
945 default_options_optimization (opts, opts_set,
946 decoded_options, decoded_options_count);
949 /* Clear any options currently held for LTO. */
950 lto_clear_user_options ();
953 read_cmdline_options (opts, opts_set,
954 decoded_options, decoded_options_count, lang_mask,
957 finish_options (opts, opts_set);
960 /* After all options have been read into OPTS and OPTS_SET, finalize
961 settings of those options and diagnose incompatible
964 finish_options (struct gcc_options *opts, struct gcc_options *opts_set)
966 static bool first_time_p = true;
967 enum unwind_info_type ui_except;
969 gcc_assert (opts == &global_options);
970 gcc_assert (opts_set = &global_options_set);
972 if (dump_base_name && ! IS_ABSOLUTE_PATH (dump_base_name))
974 /* First try to make DUMP_BASE_NAME relative to the DUMP_DIR_NAME
975 directory. Then try to make DUMP_BASE_NAME relative to the
976 AUX_BASE_NAME directory, typically the directory to contain
979 dump_base_name = concat (dump_dir_name, dump_base_name, NULL);
980 else if (aux_base_name)
982 const char *aux_base;
984 base_of_path (aux_base_name, &aux_base);
985 if (aux_base_name != aux_base)
987 int dir_len = aux_base - aux_base_name;
988 char *new_dump_base_name =
989 XNEWVEC (char, strlen(dump_base_name) + dir_len + 1);
991 /* Copy directory component from AUX_BASE_NAME. */
992 memcpy (new_dump_base_name, aux_base_name, dir_len);
993 /* Append existing DUMP_BASE_NAME. */
994 strcpy (new_dump_base_name + dir_len, dump_base_name);
995 dump_base_name = new_dump_base_name;
1000 /* Handle related options for unit-at-a-time, toplevel-reorder, and
1002 if (!flag_unit_at_a_time)
1004 if (flag_section_anchors == 1)
1005 error ("Section anchors must be disabled when unit-at-a-time "
1007 flag_section_anchors = 0;
1008 if (flag_toplevel_reorder == 1)
1009 error ("Toplevel reorder must be disabled when unit-at-a-time "
1011 flag_toplevel_reorder = 0;
1014 /* -Wmissing-noreturn is alias for -Wsuggest-attribute=noreturn. */
1015 if (warn_missing_noreturn)
1016 warn_suggest_attribute_noreturn = true;
1018 /* Unless the user has asked for section anchors, we disable toplevel
1019 reordering at -O0 to disable transformations that might be surprising
1020 to end users and to get -fno-toplevel-reorder tested. */
1021 if (!optimize && flag_toplevel_reorder == 2 && flag_section_anchors != 1)
1023 flag_toplevel_reorder = 0;
1024 flag_section_anchors = 0;
1026 if (!flag_toplevel_reorder)
1028 if (flag_section_anchors == 1)
1029 error ("section anchors must be disabled when toplevel reorder"
1031 flag_section_anchors = 0;
1037 flag_pic = flag_pie;
1038 if (flag_pic && !flag_pie)
1040 first_time_p = false;
1045 /* Inlining does not work if not optimizing,
1046 so force it not to be done. */
1051 /* The optimization to partition hot and cold basic blocks into separate
1052 sections of the .o and executable files does not work (currently)
1053 with exception handling. This is because there is no support for
1054 generating unwind info. If flag_exceptions is turned on we need to
1055 turn off the partitioning optimization. */
1057 ui_except = targetm.except_unwind_info ();
1060 && flag_reorder_blocks_and_partition
1061 && (ui_except == UI_SJLJ || ui_except == UI_TARGET))
1063 inform (input_location,
1064 "-freorder-blocks-and-partition does not work "
1065 "with exceptions on this architecture");
1066 flag_reorder_blocks_and_partition = 0;
1067 flag_reorder_blocks = 1;
1070 /* If user requested unwind info, then turn off the partitioning
1073 if (flag_unwind_tables
1074 && !targetm.unwind_tables_default
1075 && flag_reorder_blocks_and_partition
1076 && (ui_except == UI_SJLJ || ui_except == UI_TARGET))
1078 inform (input_location,
1079 "-freorder-blocks-and-partition does not support "
1080 "unwind info on this architecture");
1081 flag_reorder_blocks_and_partition = 0;
1082 flag_reorder_blocks = 1;
1085 /* If the target requested unwind info, then turn off the partitioning
1086 optimization with a different message. Likewise, if the target does not
1087 support named sections. */
1089 if (flag_reorder_blocks_and_partition
1090 && (!targetm.have_named_sections
1091 || (flag_unwind_tables
1092 && targetm.unwind_tables_default
1093 && (ui_except == UI_SJLJ || ui_except == UI_TARGET))))
1095 inform (input_location,
1096 "-freorder-blocks-and-partition does not work "
1097 "on this architecture");
1098 flag_reorder_blocks_and_partition = 0;
1099 flag_reorder_blocks = 1;
1102 /* Pipelining of outer loops is only possible when general pipelining
1103 capabilities are requested. */
1104 if (!flag_sel_sched_pipelining)
1105 flag_sel_sched_pipelining_outer_loops = 0;
1107 if (!targetm.ira_cover_classes
1108 && flag_ira_algorithm == IRA_ALGORITHM_CB)
1110 inform (input_location,
1111 "-fira-algorithm=CB does not work on this architecture");
1112 flag_ira_algorithm = IRA_ALGORITHM_PRIORITY;
1115 if (flag_conserve_stack)
1117 if (!PARAM_SET_P (PARAM_LARGE_STACK_FRAME))
1118 PARAM_VALUE (PARAM_LARGE_STACK_FRAME) = 100;
1119 if (!PARAM_SET_P (PARAM_STACK_FRAME_GROWTH))
1120 PARAM_VALUE (PARAM_STACK_FRAME_GROWTH) = 40;
1122 if (flag_wpa || flag_ltrans)
1124 /* These passes are not WHOPR compatible yet. */
1126 flag_ipa_struct_reorg = 0;
1129 if (flag_lto || flag_whopr)
1132 flag_generate_lto = 1;
1134 /* When generating IL, do not operate in whole-program mode.
1135 Otherwise, symbols will be privatized too early, causing link
1137 flag_whole_program = 0;
1139 error ("LTO support has not been enabled in this configuration");
1142 if (flag_lto_partition_balanced || flag_lto_partition_1to1)
1144 if (flag_lto_partition_balanced && flag_lto_partition_1to1)
1145 error ("Only one -flto-partitoin value can be specified");
1147 error ("-flto-partitoin has effect only with -fwhopr");
1150 /* Reconcile -flto and -fwhopr. Set additional flags as appropriate and
1151 check option consistency. */
1152 if (flag_lto && flag_whopr)
1153 error ("-flto and -fwhopr are mutually exclusive");
1155 /* We initialize flag_split_stack to -1 so that targets can set a
1156 default value if they choose based on other options. */
1157 if (flag_split_stack == -1)
1158 flag_split_stack = 0;
1159 else if (flag_split_stack)
1161 if (!targetm.supports_split_stack (true))
1163 error ("%<-fsplit-stack%> is not supported by "
1164 "this compiler configuration");
1165 flag_split_stack = 0;
1170 #define LEFT_COLUMN 27
1172 /* Output ITEM, of length ITEM_WIDTH, in the left column,
1173 followed by word-wrapped HELP in a second column. */
1175 wrap_help (const char *help,
1177 unsigned int item_width,
1178 unsigned int columns)
1180 unsigned int col_width = LEFT_COLUMN;
1181 unsigned int remaining, room, len;
1183 remaining = strlen (help);
1187 room = columns - 3 - MAX (col_width, item_width);
1196 for (i = 0; help[i]; i++)
1198 if (i >= room && len != remaining)
1202 else if ((help[i] == '-' || help[i] == '/')
1203 && help[i + 1] != ' '
1204 && i > 0 && ISALPHA (help[i - 1]))
1209 printf( " %-*.*s %.*s\n", col_width, item_width, item, len, help);
1211 while (help[len] == ' ')
1219 /* Print help for a specific front-end, etc. */
1221 print_filtered_help (unsigned int include_flags,
1222 unsigned int exclude_flags,
1223 unsigned int any_flags,
1224 unsigned int columns)
1228 static char *printed = NULL;
1230 bool displayed = false;
1232 if (include_flags == CL_PARAMS)
1234 for (i = 0; i < LAST_PARAM; i++)
1236 const char *param = compiler_params[i].option;
1238 help = compiler_params[i].help;
1239 if (help == NULL || *help == '\0')
1241 if (exclude_flags & CL_UNDOCUMENTED)
1243 help = undocumented_msg;
1246 /* Get the translation. */
1249 wrap_help (help, param, strlen (param), columns);
1256 printed = XCNEWVAR (char, cl_options_count);
1258 for (i = 0; i < cl_options_count; i++)
1260 static char new_help[128];
1261 const struct cl_option *option = cl_options + i;
1266 if (include_flags == 0
1267 || ((option->flags & include_flags) != include_flags))
1269 if ((option->flags & any_flags) == 0)
1273 /* Skip unwanted switches. */
1274 if ((option->flags & exclude_flags) != 0)
1277 /* The driver currently prints its own help text. */
1278 if ((option->flags & CL_DRIVER) != 0
1279 && (option->flags & (((1U << cl_lang_count) - 1)
1280 | CL_COMMON | CL_TARGET)) == 0)
1284 /* Skip switches that have already been printed. */
1290 help = option->help;
1293 if (exclude_flags & CL_UNDOCUMENTED)
1295 help = undocumented_msg;
1298 /* Get the translation. */
1301 /* Find the gap between the name of the
1302 option and its descriptive text. */
1303 tab = strchr (help, '\t');
1312 opt = option->opt_text;
1316 /* With the -Q option enabled we change the descriptive text associated
1317 with an option to be an indication of its current setting. */
1320 void *flag_var = option_flag_var (i, &global_options);
1322 if (len < (LEFT_COLUMN + 2))
1323 strcpy (new_help, "\t\t");
1325 strcpy (new_help, "\t");
1327 if (flag_var != NULL)
1329 if (option->flags & CL_JOINED)
1331 if (option->var_type == CLVC_STRING)
1333 if (* (const char **) flag_var != NULL)
1334 snprintf (new_help + strlen (new_help),
1335 sizeof (new_help) - strlen (new_help),
1336 * (const char **) flag_var);
1339 sprintf (new_help + strlen (new_help),
1340 "%#x", * (int *) flag_var);
1343 strcat (new_help, option_enabled (i, &global_options)
1344 ? _("[enabled]") : _("[disabled]"));
1350 wrap_help (help, opt, len, columns);
1356 unsigned int langs = include_flags & CL_LANG_ALL;
1359 printf (_(" No options with the desired characteristics were found\n"));
1364 /* PR 31349: Tell the user how to see all of the
1365 options supported by a specific front end. */
1366 for (i = 0; (1U << i) < CL_LANG_ALL; i ++)
1367 if ((1U << i) & langs)
1368 printf (_(" None found. Use --help=%s to show *all* the options supported by the %s front-end\n"),
1369 lang_names[i], lang_names[i]);
1373 else if (! displayed)
1374 printf (_(" All options with the desired characteristics have already been displayed\n"));
1379 /* Display help for a specified type of option.
1380 The options must have ALL of the INCLUDE_FLAGS set
1381 ANY of the flags in the ANY_FLAGS set
1382 and NONE of the EXCLUDE_FLAGS set. */
1384 print_specific_help (unsigned int include_flags,
1385 unsigned int exclude_flags,
1386 unsigned int any_flags)
1388 unsigned int all_langs_mask = (1U << cl_lang_count) - 1;
1389 const char * description = NULL;
1390 const char * descrip_extra = "";
1393 static unsigned int columns = 0;
1395 /* Sanity check: Make sure that we do not have more
1396 languages than we have bits available to enumerate them. */
1397 gcc_assert ((1U << cl_lang_count) < CL_MIN_OPTION_CLASS);
1399 /* If we have not done so already, obtain
1400 the desired maximum width of the output. */
1405 GET_ENVIRONMENT (p, "COLUMNS");
1408 int value = atoi (p);
1415 /* Use a reasonable default. */
1419 /* Decide upon the title for the options that we are going to display. */
1420 for (i = 0, flag = 1; flag <= CL_MAX_OPTION_CLASS; flag <<= 1, i ++)
1422 switch (flag & include_flags)
1429 description = _("The following options are target specific");
1432 description = _("The following options control compiler warning messages");
1434 case CL_OPTIMIZATION:
1435 description = _("The following options control optimizations");
1438 description = _("The following options are language-independent");
1441 description = _("The --param option recognizes the following as parameters");
1444 if (i >= cl_lang_count)
1446 if (exclude_flags & all_langs_mask)
1447 description = _("The following options are specific to just the language ");
1449 description = _("The following options are supported by the language ");
1450 descrip_extra = lang_names [i];
1455 if (description == NULL)
1459 if (include_flags & CL_UNDOCUMENTED)
1460 description = _("The following options are not documented");
1461 else if (include_flags & CL_SEPARATE)
1462 description = _("The following options take separate arguments");
1463 else if (include_flags & CL_JOINED)
1464 description = _("The following options take joined arguments");
1467 internal_error ("unrecognized include_flags 0x%x passed to print_specific_help",
1474 if (any_flags & all_langs_mask)
1475 description = _("The following options are language-related");
1477 description = _("The following options are language-independent");
1481 printf ("%s%s:\n", description, descrip_extra);
1482 print_filtered_help (include_flags, exclude_flags, any_flags, columns);
1485 /* Handle target- and language-independent options. Return zero to
1486 generate an "unknown option" message. Only options that need
1487 extra handling need to be listed here; if you simply want
1488 DECODED->value assigned to a variable, it happens automatically. */
1491 common_handle_option (struct gcc_options *opts,
1492 struct gcc_options *opts_set,
1493 const struct cl_decoded_option *decoded,
1494 unsigned int lang_mask, int kind ATTRIBUTE_UNUSED,
1495 const struct cl_option_handlers *handlers)
1497 size_t scode = decoded->opt_index;
1498 const char *arg = decoded->arg;
1499 int value = decoded->value;
1500 static bool verbose = false;
1501 enum opt_code code = (enum opt_code) scode;
1503 gcc_assert (opts == &global_options);
1504 gcc_assert (opts_set == &global_options_set);
1505 gcc_assert (decoded->canonical_option_num_elements <= 2);
1519 unsigned int all_langs_mask = (1U << cl_lang_count) - 1;
1520 unsigned int undoc_mask;
1523 undoc_mask = (verbose | extra_warnings) ? 0 : CL_UNDOCUMENTED;
1524 /* First display any single language specific options. */
1525 for (i = 0; i < cl_lang_count; i++)
1527 (1U << i, (all_langs_mask & (~ (1U << i))) | undoc_mask, 0);
1528 /* Next display any multi language specific options. */
1529 print_specific_help (0, undoc_mask, all_langs_mask);
1530 /* Then display any remaining, non-language options. */
1531 for (i = CL_MIN_OPTION_CLASS; i <= CL_MAX_OPTION_CLASS; i <<= 1)
1533 print_specific_help (i, undoc_mask, 0);
1534 exit_after_options = true;
1538 case OPT__target_help:
1539 print_specific_help (CL_TARGET, CL_UNDOCUMENTED, 0);
1540 exit_after_options = true;
1542 /* Allow the target a chance to give the user some additional information. */
1549 const char * a = arg;
1550 unsigned int include_flags = 0;
1551 /* Note - by default we include undocumented options when listing
1552 specific classes. If you only want to see documented options
1553 then add ",^undocumented" to the --help= option. E.g.:
1555 --help=target,^undocumented */
1556 unsigned int exclude_flags = 0;
1558 /* Walk along the argument string, parsing each word in turn.
1560 arg = [^]{word}[,{arg}]
1561 word = {optimizers|target|warnings|undocumented|
1562 params|common|<language>} */
1567 const char * string;
1572 { "optimizers", CL_OPTIMIZATION },
1573 { "target", CL_TARGET },
1574 { "warnings", CL_WARNING },
1575 { "undocumented", CL_UNDOCUMENTED },
1576 { "params", CL_PARAMS },
1577 { "joined", CL_JOINED },
1578 { "separate", CL_SEPARATE },
1579 { "common", CL_COMMON },
1582 unsigned int * pflags;
1584 unsigned int lang_flag, specific_flag;
1591 pflags = & exclude_flags;
1594 pflags = & include_flags;
1596 comma = strchr (a, ',');
1607 /* Check to see if the string matches an option class name. */
1608 for (i = 0, specific_flag = 0; specifics[i].string != NULL; i++)
1609 if (strncasecmp (a, specifics[i].string, len) == 0)
1611 specific_flag = specifics[i].flag;
1615 /* Check to see if the string matches a language name.
1616 Note - we rely upon the alpha-sorted nature of the entries in
1617 the lang_names array, specifically that shorter names appear
1618 before their longer variants. (i.e. C before C++). That way
1619 when we are attempting to match --help=c for example we will
1620 match with C first and not C++. */
1621 for (i = 0, lang_flag = 0; i < cl_lang_count; i++)
1622 if (strncasecmp (a, lang_names[i], len) == 0)
1624 lang_flag = 1U << i;
1628 if (specific_flag != 0)
1631 * pflags |= specific_flag;
1634 /* The option's argument matches both the start of a
1635 language name and the start of an option class name.
1636 We have a special case for when the user has
1637 specified "--help=c", but otherwise we have to issue
1639 if (strncasecmp (a, "c", len) == 0)
1640 * pflags |= lang_flag;
1643 "warning: --help argument %.*s is ambiguous, please be more specific\n",
1647 else if (lang_flag != 0)
1648 * pflags |= lang_flag;
1651 "warning: unrecognized argument to --help= option: %.*s\n",
1660 print_specific_help (include_flags, exclude_flags, 0);
1661 exit_after_options = true;
1666 exit_after_options = true;
1672 /* Currently handled in a prescan. */
1676 enable_warning_as_error (arg, value, lang_mask, handlers, global_dc);
1679 case OPT_Wlarger_than_:
1680 larger_than_size = value;
1681 warn_larger_than = value != -1;
1684 case OPT_Wfatal_errors:
1685 global_dc->fatal_errors = value;
1688 case OPT_Wframe_larger_than_:
1689 frame_larger_than_size = value;
1690 warn_frame_larger_than = value != -1;
1693 case OPT_Wstrict_aliasing:
1694 set_Wstrict_aliasing (value);
1697 case OPT_Wstrict_aliasing_:
1698 warn_strict_aliasing = value;
1701 case OPT_Wstrict_overflow:
1702 warn_strict_overflow = (value
1703 ? (int) WARN_STRICT_OVERFLOW_CONDITIONAL
1707 case OPT_Wstrict_overflow_:
1708 warn_strict_overflow = value;
1711 case OPT_Wsystem_headers:
1712 global_dc->dc_warn_system_headers = value;
1716 warn_unused = value;
1720 aux_info_file_name = arg;
1721 flag_gen_aux_info = 1;
1725 aux_base_name = arg;
1728 case OPT_auxbase_strip:
1730 char *tmp = xstrdup (arg);
1731 strip_off_ending (tmp, strlen (tmp));
1733 aux_base_name = tmp;
1738 decode_d_option (arg);
1742 dump_base_name = arg;
1746 dump_dir_name = arg;
1749 case OPT_falign_functions_:
1750 align_functions = value;
1753 case OPT_falign_jumps_:
1754 align_jumps = value;
1757 case OPT_falign_labels_:
1758 align_labels = value;
1761 case OPT_falign_loops_:
1762 align_loops = value;
1765 case OPT_fcall_used_:
1766 fix_register (arg, 0, 1);
1769 case OPT_fcall_saved_:
1770 fix_register (arg, 0, 0);
1773 case OPT_fcompare_debug_second:
1774 flag_compare_debug = value;
1778 dbg_cnt_process_opt (arg);
1781 case OPT_fdbg_cnt_list:
1782 dbg_cnt_list_all_counters ();
1785 case OPT_fdebug_prefix_map_:
1786 add_debug_prefix_map (arg);
1789 case OPT_fdiagnostics_show_location_:
1790 if (!strcmp (arg, "once"))
1791 diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
1792 else if (!strcmp (arg, "every-line"))
1793 diagnostic_prefixing_rule (global_dc)
1794 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE;
1799 case OPT_fdiagnostics_show_option:
1800 global_dc->show_option_requested = value;
1804 if (!dump_switch_p (arg))
1808 case OPT_fexcess_precision_:
1809 if (!strcmp (arg, "fast"))
1810 flag_excess_precision_cmdline = EXCESS_PRECISION_FAST;
1811 else if (!strcmp (arg, "standard"))
1812 flag_excess_precision_cmdline = EXCESS_PRECISION_STANDARD;
1814 error ("unknown excess precision style \"%s\"", arg);
1817 case OPT_ffast_math:
1818 set_fast_math_flags (value);
1821 case OPT_funsafe_math_optimizations:
1822 set_unsafe_math_optimizations_flags (value);
1826 fix_register (arg, 1, 1);
1829 case OPT_finline_limit_:
1830 set_param_value ("max-inline-insns-single", value / 2);
1831 set_param_value ("max-inline-insns-auto", value / 2);
1834 case OPT_finstrument_functions_exclude_function_list_:
1835 add_comma_separated_to_vector
1836 (&flag_instrument_functions_exclude_functions, arg);
1839 case OPT_finstrument_functions_exclude_file_list_:
1840 add_comma_separated_to_vector
1841 (&flag_instrument_functions_exclude_files, arg);
1844 case OPT_fmessage_length_:
1845 pp_set_line_maximum_length (global_dc->printer, value);
1848 case OPT_fpack_struct_:
1849 if (value <= 0 || (value & (value - 1)) || value > 16)
1850 error ("structure alignment must be a small power of two, not %d", value);
1853 initial_max_fld_align = value;
1854 maximum_field_alignment = value * BITS_PER_UNIT;
1859 #ifdef ENABLE_PLUGIN
1860 add_new_plugin (arg);
1862 error ("Plugin support is disabled. Configure with --enable-plugin.");
1866 case OPT_fplugin_arg_:
1867 #ifdef ENABLE_PLUGIN
1868 parse_plugin_arg_opt (arg);
1870 error ("Plugin support is disabled. Configure with --enable-plugin.");
1874 case OPT_fprofile_dir_:
1875 profile_data_prefix = xstrdup (arg);
1878 case OPT_fprofile_use_:
1879 profile_data_prefix = xstrdup (arg);
1880 flag_profile_use = true;
1882 /* No break here - do -fprofile-use processing. */
1883 case OPT_fprofile_use:
1884 if (!opts_set->x_flag_branch_probabilities)
1885 flag_branch_probabilities = value;
1886 if (!opts_set->x_flag_profile_values)
1887 flag_profile_values = value;
1888 if (!opts_set->x_flag_unroll_loops)
1889 flag_unroll_loops = value;
1890 if (!opts_set->x_flag_peel_loops)
1891 flag_peel_loops = value;
1892 if (!opts_set->x_flag_tracer)
1893 flag_tracer = value;
1894 if (!opts_set->x_flag_value_profile_transformations)
1895 flag_value_profile_transformations = value;
1896 if (!opts_set->x_flag_inline_functions)
1897 flag_inline_functions = value;
1898 if (!opts_set->x_flag_ipa_cp)
1899 flag_ipa_cp = value;
1900 if (!opts_set->x_flag_ipa_cp_clone
1901 && value && flag_ipa_cp)
1902 flag_ipa_cp_clone = value;
1903 if (!opts_set->x_flag_predictive_commoning)
1904 flag_predictive_commoning = value;
1905 if (!opts_set->x_flag_unswitch_loops)
1906 flag_unswitch_loops = value;
1907 if (!opts_set->x_flag_gcse_after_reload)
1908 flag_gcse_after_reload = value;
1911 case OPT_fprofile_generate_:
1912 profile_data_prefix = xstrdup (arg);
1914 /* No break here - do -fprofile-generate processing. */
1915 case OPT_fprofile_generate:
1916 if (!opts_set->x_profile_arc_flag)
1917 profile_arc_flag = value;
1918 if (!opts_set->x_flag_profile_values)
1919 flag_profile_values = value;
1920 if (!opts_set->x_flag_value_profile_transformations)
1921 flag_value_profile_transformations = value;
1922 if (!opts_set->x_flag_inline_functions)
1923 flag_inline_functions = value;
1926 case OPT_fshow_column:
1927 global_dc->show_column = value;
1930 case OPT_fvisibility_:
1932 if (!strcmp(arg, "default"))
1933 default_visibility = VISIBILITY_DEFAULT;
1934 else if (!strcmp(arg, "internal"))
1935 default_visibility = VISIBILITY_INTERNAL;
1936 else if (!strcmp(arg, "hidden"))
1937 default_visibility = VISIBILITY_HIDDEN;
1938 else if (!strcmp(arg, "protected"))
1939 default_visibility = VISIBILITY_PROTECTED;
1941 error ("unrecognized visibility value \"%s\"", arg);
1945 case OPT_frandom_seed:
1946 /* The real switch is -fno-random-seed. */
1949 set_random_seed (NULL);
1952 case OPT_frandom_seed_:
1953 set_random_seed (arg);
1956 case OPT_fsched_verbose_:
1957 #ifdef INSN_SCHEDULING
1958 fix_sched_param ("verbose", arg);
1964 case OPT_fsched_stalled_insns_:
1965 flag_sched_stalled_insns = value;
1966 if (flag_sched_stalled_insns == 0)
1967 flag_sched_stalled_insns = -1;
1970 case OPT_fsched_stalled_insns_dep_:
1971 flag_sched_stalled_insns_dep = value;
1974 case OPT_fstack_check_:
1975 if (!strcmp (arg, "no"))
1976 flag_stack_check = NO_STACK_CHECK;
1977 else if (!strcmp (arg, "generic"))
1978 /* This is the old stack checking method. */
1979 flag_stack_check = STACK_CHECK_BUILTIN
1980 ? FULL_BUILTIN_STACK_CHECK
1981 : GENERIC_STACK_CHECK;
1982 else if (!strcmp (arg, "specific"))
1983 /* This is the new stack checking method. */
1984 flag_stack_check = STACK_CHECK_BUILTIN
1985 ? FULL_BUILTIN_STACK_CHECK
1986 : STACK_CHECK_STATIC_BUILTIN
1987 ? STATIC_BUILTIN_STACK_CHECK
1988 : GENERIC_STACK_CHECK;
1990 warning (0, "unknown stack check parameter \"%s\"", arg);
1993 case OPT_fstack_limit:
1994 /* The real switch is -fno-stack-limit. */
1997 stack_limit_rtx = NULL_RTX;
2000 case OPT_fstack_limit_register_:
2002 int reg = decode_reg_name (arg);
2004 error ("unrecognized register name \"%s\"", arg);
2006 stack_limit_rtx = gen_rtx_REG (Pmode, reg);
2010 case OPT_fstack_limit_symbol_:
2011 stack_limit_rtx = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (arg));
2014 case OPT_ftree_vectorizer_verbose_:
2015 vect_set_verbosity_level (arg);
2018 case OPT_ftls_model_:
2019 if (!strcmp (arg, "global-dynamic"))
2020 flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC;
2021 else if (!strcmp (arg, "local-dynamic"))
2022 flag_tls_default = TLS_MODEL_LOCAL_DYNAMIC;
2023 else if (!strcmp (arg, "initial-exec"))
2024 flag_tls_default = TLS_MODEL_INITIAL_EXEC;
2025 else if (!strcmp (arg, "local-exec"))
2026 flag_tls_default = TLS_MODEL_LOCAL_EXEC;
2028 warning (0, "unknown tls-model \"%s\"", arg);
2031 case OPT_fira_algorithm_:
2032 if (!strcmp (arg, "CB"))
2033 flag_ira_algorithm = IRA_ALGORITHM_CB;
2034 else if (!strcmp (arg, "priority"))
2035 flag_ira_algorithm = IRA_ALGORITHM_PRIORITY;
2037 warning (0, "unknown ira algorithm \"%s\"", arg);
2040 case OPT_fira_region_:
2041 if (!strcmp (arg, "one"))
2042 flag_ira_region = IRA_REGION_ONE;
2043 else if (!strcmp (arg, "all"))
2044 flag_ira_region = IRA_REGION_ALL;
2045 else if (!strcmp (arg, "mixed"))
2046 flag_ira_region = IRA_REGION_MIXED;
2048 warning (0, "unknown ira region \"%s\"", arg);
2051 case OPT_fira_verbose_:
2052 flag_ira_verbose = value;
2056 set_debug_level (NO_DEBUG, DEFAULT_GDB_EXTENSIONS, arg);
2060 set_debug_level (SDB_DEBUG, false, arg);
2064 if (value < 2 || value > 4)
2065 error ("dwarf version %d is not supported", value);
2067 dwarf_version = value;
2068 set_debug_level (DWARF2_DEBUG, false, "");
2072 set_debug_level (NO_DEBUG, 2, arg);
2077 set_debug_level (DBX_DEBUG, code == OPT_gstabs_, arg);
2081 set_debug_level (VMS_DEBUG, false, arg);
2086 set_debug_level (XCOFF_DEBUG, code == OPT_gxcoff_, arg);
2090 asm_file_name = arg;
2093 case OPT_pedantic_errors:
2094 flag_pedantic_errors = pedantic = 1;
2095 global_dc->pedantic_errors = 1;
2107 global_dc->dc_inhibit_warnings = true;
2110 case OPT_fuse_linker_plugin:
2111 /* No-op. Used by the driver and passed to us because it starts with f.*/
2115 /* If the flag was handled in a standard way, assume the lack of
2116 processing here is intentional. */
2117 gcc_assert (option_flag_var (scode, opts));
2124 /* Handle --param NAME=VALUE. */
2126 handle_param (const char *carg)
2131 arg = xstrdup (carg);
2132 equal = strchr (arg, '=');
2134 error ("%s: --param arguments should be of the form NAME=VALUE", arg);
2137 value = integral_argument (equal + 1);
2139 error ("invalid --param value %qs", equal + 1);
2143 set_param_value (arg, value);
2150 /* Used to set the level of strict aliasing warnings,
2151 when no level is specified (i.e., when -Wstrict-aliasing, and not
2152 -Wstrict-aliasing=level was given).
2153 ONOFF is assumed to take value 1 when -Wstrict-aliasing is specified,
2154 and 0 otherwise. After calling this function, wstrict_aliasing will be
2155 set to the default value of -Wstrict_aliasing=level, currently 3. */
2157 set_Wstrict_aliasing (int onoff)
2159 gcc_assert (onoff == 0 || onoff == 1);
2161 warn_strict_aliasing = 3;
2163 warn_strict_aliasing = 0;
2166 /* The following routines are useful in setting all the flags that
2167 -ffast-math and -fno-fast-math imply. */
2169 set_fast_math_flags (int set)
2171 flag_unsafe_math_optimizations = set;
2172 set_unsafe_math_optimizations_flags (set);
2173 flag_finite_math_only = set;
2174 flag_errno_math = !set;
2177 flag_signaling_nans = 0;
2178 flag_rounding_math = 0;
2179 flag_cx_limited_range = 1;
2183 /* When -funsafe-math-optimizations is set the following
2184 flags are set as well. */
2186 set_unsafe_math_optimizations_flags (int set)
2188 flag_trapping_math = !set;
2189 flag_signed_zeros = !set;
2190 flag_associative_math = set;
2191 flag_reciprocal_math = set;
2194 /* Return true iff flags are set as if -ffast-math. */
2196 fast_math_flags_set_p (void)
2198 return (!flag_trapping_math
2199 && flag_unsafe_math_optimizations
2200 && flag_finite_math_only
2201 && !flag_signed_zeros
2202 && !flag_errno_math);
2205 /* Return true iff flags are set as if -ffast-math but using the flags stored
2206 in the struct cl_optimization structure. */
2208 fast_math_flags_struct_set_p (struct cl_optimization *opt)
2210 return (!opt->x_flag_trapping_math
2211 && opt->x_flag_unsafe_math_optimizations
2212 && opt->x_flag_finite_math_only
2213 && !opt->x_flag_signed_zeros
2214 && !opt->x_flag_errno_math);
2217 /* Handle a debug output -g switch. EXTENDED is true or false to support
2218 extended output (2 is special and means "-ggdb" was given). */
2220 set_debug_level (enum debug_info_type type, int extended, const char *arg)
2222 static bool type_explicit;
2224 use_gnu_debug_info_extensions = extended;
2226 if (type == NO_DEBUG)
2228 if (write_symbols == NO_DEBUG)
2230 write_symbols = PREFERRED_DEBUGGING_TYPE;
2234 #ifdef DWARF2_DEBUGGING_INFO
2235 write_symbols = DWARF2_DEBUG;
2236 #elif defined DBX_DEBUGGING_INFO
2237 write_symbols = DBX_DEBUG;
2241 if (write_symbols == NO_DEBUG)
2242 warning (0, "target system does not support debug output");
2247 /* Does it conflict with an already selected type? */
2248 if (type_explicit && write_symbols != NO_DEBUG && type != write_symbols)
2249 error ("debug format \"%s\" conflicts with prior selection",
2250 debug_type_names[type]);
2251 write_symbols = type;
2252 type_explicit = true;
2255 /* A debug flag without a level defaults to level 2. */
2258 if (!debug_info_level)
2259 debug_info_level = DINFO_LEVEL_NORMAL;
2263 int argval = integral_argument (arg);
2265 error ("unrecognised debug output level \"%s\"", arg);
2266 else if (argval > 3)
2267 error ("debug output level %s is too high", arg);
2269 debug_info_level = (enum debug_info_level) argval;
2273 /* Return 1 if option OPT_IDX is enabled in OPTS, 0 if it is disabled,
2274 or -1 if it isn't a simple on-off switch. */
2277 option_enabled (int opt_idx, void *opts)
2279 const struct cl_option *option = &(cl_options[opt_idx]);
2280 struct gcc_options *optsg = (struct gcc_options *) opts;
2281 void *flag_var = option_flag_var (opt_idx, optsg);
2284 switch (option->var_type)
2287 return *(int *) flag_var != 0;
2290 return *(int *) flag_var == option->var_value;
2292 case CLVC_BIT_CLEAR:
2293 return (*(int *) flag_var & option->var_value) == 0;
2296 return (*(int *) flag_var & option->var_value) != 0;
2304 /* Fill STATE with the current state of option OPTION in OPTS. Return
2305 true if there is some state to store. */
2308 get_option_state (struct gcc_options *opts, int option,
2309 struct cl_option_state *state)
2311 void *flag_var = option_flag_var (option, opts);
2316 switch (cl_options[option].var_type)
2320 state->data = flag_var;
2321 state->size = sizeof (int);
2324 case CLVC_BIT_CLEAR:
2326 state->ch = option_enabled (option, opts);
2327 state->data = &state->ch;
2332 state->data = *(const char **) flag_var;
2333 if (state->data == 0)
2335 state->size = strlen ((const char *) state->data) + 1;
2341 /* Callback function, called when -Werror= enables a warning. */
2343 static void (*warning_as_error_callback) (int) = NULL;
2345 /* Register a callback for enable_warning_as_error calls. */
2348 register_warning_as_error_callback (void (*callback) (int))
2350 gcc_assert (warning_as_error_callback == NULL || callback == NULL);
2351 warning_as_error_callback = callback;
2354 /* Enable (or disable if VALUE is 0) a warning option ARG (language
2355 mask LANG_MASK, option handlers HANDLERS) as an error for
2356 diagnostic context DC (possibly NULL). This is used by
2360 enable_warning_as_error (const char *arg, int value, unsigned int lang_mask,
2361 const struct cl_option_handlers *handlers,
2362 diagnostic_context *dc)
2367 new_option = XNEWVEC (char, strlen (arg) + 2);
2368 new_option[0] = 'W';
2369 strcpy (new_option + 1, arg);
2370 option_index = find_opt (new_option, lang_mask);
2371 if (option_index == OPT_SPECIAL_unknown)
2373 error ("-Werror=%s: No option -%s", arg, new_option);
2377 const struct cl_option *option = &cl_options[option_index];
2378 const diagnostic_t kind = value ? DK_ERROR : DK_WARNING;
2380 if (option->alias_target != N_OPTS)
2381 option_index = option->alias_target;
2382 if (option_index == OPT_SPECIAL_ignore)
2385 diagnostic_classify_diagnostic (dc, option_index, kind,
2387 if (kind == DK_ERROR)
2389 const struct cl_option * const option = cl_options + option_index;
2391 /* -Werror=foo implies -Wfoo. */
2392 if (option->var_type == CLVC_BOOLEAN)
2393 handle_generated_option (&global_options, &global_options_set,
2394 option_index, NULL, value, lang_mask,
2395 (int)kind, handlers,
2398 if (warning_as_error_callback)
2399 warning_as_error_callback (option_index);
2405 /* Return malloced memory for the name of the option OPTION_INDEX
2406 which enabled a diagnostic (context CONTEXT), originally of type
2407 ORIG_DIAG_KIND but possibly converted to DIAG_KIND by options such
2411 option_name (diagnostic_context *context, int option_index,
2412 diagnostic_t orig_diag_kind, diagnostic_t diag_kind)
2416 /* A warning classified as an error. */
2417 if ((orig_diag_kind == DK_WARNING || orig_diag_kind == DK_PEDWARN)
2418 && diag_kind == DK_ERROR)
2419 return concat (cl_options[OPT_Werror_].opt_text,
2420 /* Skip over "-W". */
2421 cl_options[option_index].opt_text + 2,
2423 /* A warning with option. */
2425 return xstrdup (cl_options[option_index].opt_text);
2427 /* A warning without option classified as an error. */
2428 else if (orig_diag_kind == DK_WARNING || orig_diag_kind == DK_PEDWARN
2429 || diag_kind == DK_WARNING)
2431 if (context->warning_as_error_requested)
2432 return xstrdup (cl_options[OPT_Werror].opt_text);
2434 return xstrdup (_("enabled by default"));