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 = PARAM_VALUE (PARAM_MIN_CROSSJUMP_INSNS);
673 initial_max_fields_for_field_sensitive
674 = PARAM_VALUE (PARAM_MAX_FIELDS_FOR_FIELD_SENSITIVE);
675 initial_loop_invariant_max_bbs_in_loop
676 = PARAM_VALUE (PARAM_LOOP_INVARIANT_MAX_BBS_IN_LOOP);
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 maybe_set_param_value (PARAM_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 maybe_set_param_value (PARAM_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 maybe_set_param_value (PARAM_MIN_CROSSJUMP_INSNS, 1);
897 maybe_set_param_value (PARAM_MIN_CROSSJUMP_INSNS,
898 initial_min_crossjump_insns);
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 maybe_set_param_value (PARAM_STACK_FRAME_GROWTH, 40);
1121 if (flag_wpa || flag_ltrans)
1123 /* These passes are not WHOPR compatible yet. */
1125 flag_ipa_struct_reorg = 0;
1128 if (flag_lto || flag_whopr)
1131 flag_generate_lto = 1;
1133 /* When generating IL, do not operate in whole-program mode.
1134 Otherwise, symbols will be privatized too early, causing link
1136 flag_whole_program = 0;
1138 error ("LTO support has not been enabled in this configuration");
1141 if (flag_lto_partition_balanced || flag_lto_partition_1to1)
1143 if (flag_lto_partition_balanced && flag_lto_partition_1to1)
1144 error ("Only one -flto-partitoin value can be specified");
1146 error ("-flto-partitoin has effect only with -fwhopr");
1149 /* Reconcile -flto and -fwhopr. Set additional flags as appropriate and
1150 check option consistency. */
1151 if (flag_lto && flag_whopr)
1152 error ("-flto and -fwhopr are mutually exclusive");
1154 /* We initialize flag_split_stack to -1 so that targets can set a
1155 default value if they choose based on other options. */
1156 if (flag_split_stack == -1)
1157 flag_split_stack = 0;
1158 else if (flag_split_stack)
1160 if (!targetm.supports_split_stack (true))
1162 error ("%<-fsplit-stack%> is not supported by "
1163 "this compiler configuration");
1164 flag_split_stack = 0;
1169 #define LEFT_COLUMN 27
1171 /* Output ITEM, of length ITEM_WIDTH, in the left column,
1172 followed by word-wrapped HELP in a second column. */
1174 wrap_help (const char *help,
1176 unsigned int item_width,
1177 unsigned int columns)
1179 unsigned int col_width = LEFT_COLUMN;
1180 unsigned int remaining, room, len;
1182 remaining = strlen (help);
1186 room = columns - 3 - MAX (col_width, item_width);
1195 for (i = 0; help[i]; i++)
1197 if (i >= room && len != remaining)
1201 else if ((help[i] == '-' || help[i] == '/')
1202 && help[i + 1] != ' '
1203 && i > 0 && ISALPHA (help[i - 1]))
1208 printf( " %-*.*s %.*s\n", col_width, item_width, item, len, help);
1210 while (help[len] == ' ')
1218 /* Print help for a specific front-end, etc. */
1220 print_filtered_help (unsigned int include_flags,
1221 unsigned int exclude_flags,
1222 unsigned int any_flags,
1223 unsigned int columns)
1227 static char *printed = NULL;
1229 bool displayed = false;
1231 if (include_flags == CL_PARAMS)
1233 for (i = 0; i < LAST_PARAM; i++)
1235 const char *param = compiler_params[i].option;
1237 help = compiler_params[i].help;
1238 if (help == NULL || *help == '\0')
1240 if (exclude_flags & CL_UNDOCUMENTED)
1242 help = undocumented_msg;
1245 /* Get the translation. */
1248 wrap_help (help, param, strlen (param), columns);
1255 printed = XCNEWVAR (char, cl_options_count);
1257 for (i = 0; i < cl_options_count; i++)
1259 static char new_help[128];
1260 const struct cl_option *option = cl_options + i;
1265 if (include_flags == 0
1266 || ((option->flags & include_flags) != include_flags))
1268 if ((option->flags & any_flags) == 0)
1272 /* Skip unwanted switches. */
1273 if ((option->flags & exclude_flags) != 0)
1276 /* The driver currently prints its own help text. */
1277 if ((option->flags & CL_DRIVER) != 0
1278 && (option->flags & (((1U << cl_lang_count) - 1)
1279 | CL_COMMON | CL_TARGET)) == 0)
1283 /* Skip switches that have already been printed. */
1289 help = option->help;
1292 if (exclude_flags & CL_UNDOCUMENTED)
1294 help = undocumented_msg;
1297 /* Get the translation. */
1300 /* Find the gap between the name of the
1301 option and its descriptive text. */
1302 tab = strchr (help, '\t');
1311 opt = option->opt_text;
1315 /* With the -Q option enabled we change the descriptive text associated
1316 with an option to be an indication of its current setting. */
1319 void *flag_var = option_flag_var (i, &global_options);
1321 if (len < (LEFT_COLUMN + 2))
1322 strcpy (new_help, "\t\t");
1324 strcpy (new_help, "\t");
1326 if (flag_var != NULL)
1328 if (option->flags & CL_JOINED)
1330 if (option->var_type == CLVC_STRING)
1332 if (* (const char **) flag_var != NULL)
1333 snprintf (new_help + strlen (new_help),
1334 sizeof (new_help) - strlen (new_help),
1335 * (const char **) flag_var);
1338 sprintf (new_help + strlen (new_help),
1339 "%#x", * (int *) flag_var);
1342 strcat (new_help, option_enabled (i, &global_options)
1343 ? _("[enabled]") : _("[disabled]"));
1349 wrap_help (help, opt, len, columns);
1355 unsigned int langs = include_flags & CL_LANG_ALL;
1358 printf (_(" No options with the desired characteristics were found\n"));
1363 /* PR 31349: Tell the user how to see all of the
1364 options supported by a specific front end. */
1365 for (i = 0; (1U << i) < CL_LANG_ALL; i ++)
1366 if ((1U << i) & langs)
1367 printf (_(" None found. Use --help=%s to show *all* the options supported by the %s front-end\n"),
1368 lang_names[i], lang_names[i]);
1372 else if (! displayed)
1373 printf (_(" All options with the desired characteristics have already been displayed\n"));
1378 /* Display help for a specified type of option.
1379 The options must have ALL of the INCLUDE_FLAGS set
1380 ANY of the flags in the ANY_FLAGS set
1381 and NONE of the EXCLUDE_FLAGS set. */
1383 print_specific_help (unsigned int include_flags,
1384 unsigned int exclude_flags,
1385 unsigned int any_flags)
1387 unsigned int all_langs_mask = (1U << cl_lang_count) - 1;
1388 const char * description = NULL;
1389 const char * descrip_extra = "";
1392 static unsigned int columns = 0;
1394 /* Sanity check: Make sure that we do not have more
1395 languages than we have bits available to enumerate them. */
1396 gcc_assert ((1U << cl_lang_count) < CL_MIN_OPTION_CLASS);
1398 /* If we have not done so already, obtain
1399 the desired maximum width of the output. */
1404 GET_ENVIRONMENT (p, "COLUMNS");
1407 int value = atoi (p);
1414 /* Use a reasonable default. */
1418 /* Decide upon the title for the options that we are going to display. */
1419 for (i = 0, flag = 1; flag <= CL_MAX_OPTION_CLASS; flag <<= 1, i ++)
1421 switch (flag & include_flags)
1428 description = _("The following options are target specific");
1431 description = _("The following options control compiler warning messages");
1433 case CL_OPTIMIZATION:
1434 description = _("The following options control optimizations");
1437 description = _("The following options are language-independent");
1440 description = _("The --param option recognizes the following as parameters");
1443 if (i >= cl_lang_count)
1445 if (exclude_flags & all_langs_mask)
1446 description = _("The following options are specific to just the language ");
1448 description = _("The following options are supported by the language ");
1449 descrip_extra = lang_names [i];
1454 if (description == NULL)
1458 if (include_flags & CL_UNDOCUMENTED)
1459 description = _("The following options are not documented");
1460 else if (include_flags & CL_SEPARATE)
1461 description = _("The following options take separate arguments");
1462 else if (include_flags & CL_JOINED)
1463 description = _("The following options take joined arguments");
1466 internal_error ("unrecognized include_flags 0x%x passed to print_specific_help",
1473 if (any_flags & all_langs_mask)
1474 description = _("The following options are language-related");
1476 description = _("The following options are language-independent");
1480 printf ("%s%s:\n", description, descrip_extra);
1481 print_filtered_help (include_flags, exclude_flags, any_flags, columns);
1484 /* Handle target- and language-independent options. Return zero to
1485 generate an "unknown option" message. Only options that need
1486 extra handling need to be listed here; if you simply want
1487 DECODED->value assigned to a variable, it happens automatically. */
1490 common_handle_option (struct gcc_options *opts,
1491 struct gcc_options *opts_set,
1492 const struct cl_decoded_option *decoded,
1493 unsigned int lang_mask, int kind ATTRIBUTE_UNUSED,
1494 const struct cl_option_handlers *handlers)
1496 size_t scode = decoded->opt_index;
1497 const char *arg = decoded->arg;
1498 int value = decoded->value;
1499 static bool verbose = false;
1500 enum opt_code code = (enum opt_code) scode;
1502 gcc_assert (opts == &global_options);
1503 gcc_assert (opts_set == &global_options_set);
1504 gcc_assert (decoded->canonical_option_num_elements <= 2);
1518 unsigned int all_langs_mask = (1U << cl_lang_count) - 1;
1519 unsigned int undoc_mask;
1522 undoc_mask = (verbose | extra_warnings) ? 0 : CL_UNDOCUMENTED;
1523 /* First display any single language specific options. */
1524 for (i = 0; i < cl_lang_count; i++)
1526 (1U << i, (all_langs_mask & (~ (1U << i))) | undoc_mask, 0);
1527 /* Next display any multi language specific options. */
1528 print_specific_help (0, undoc_mask, all_langs_mask);
1529 /* Then display any remaining, non-language options. */
1530 for (i = CL_MIN_OPTION_CLASS; i <= CL_MAX_OPTION_CLASS; i <<= 1)
1532 print_specific_help (i, undoc_mask, 0);
1533 exit_after_options = true;
1537 case OPT__target_help:
1538 print_specific_help (CL_TARGET, CL_UNDOCUMENTED, 0);
1539 exit_after_options = true;
1541 /* Allow the target a chance to give the user some additional information. */
1548 const char * a = arg;
1549 unsigned int include_flags = 0;
1550 /* Note - by default we include undocumented options when listing
1551 specific classes. If you only want to see documented options
1552 then add ",^undocumented" to the --help= option. E.g.:
1554 --help=target,^undocumented */
1555 unsigned int exclude_flags = 0;
1557 /* Walk along the argument string, parsing each word in turn.
1559 arg = [^]{word}[,{arg}]
1560 word = {optimizers|target|warnings|undocumented|
1561 params|common|<language>} */
1566 const char * string;
1571 { "optimizers", CL_OPTIMIZATION },
1572 { "target", CL_TARGET },
1573 { "warnings", CL_WARNING },
1574 { "undocumented", CL_UNDOCUMENTED },
1575 { "params", CL_PARAMS },
1576 { "joined", CL_JOINED },
1577 { "separate", CL_SEPARATE },
1578 { "common", CL_COMMON },
1581 unsigned int * pflags;
1583 unsigned int lang_flag, specific_flag;
1590 pflags = & exclude_flags;
1593 pflags = & include_flags;
1595 comma = strchr (a, ',');
1606 /* Check to see if the string matches an option class name. */
1607 for (i = 0, specific_flag = 0; specifics[i].string != NULL; i++)
1608 if (strncasecmp (a, specifics[i].string, len) == 0)
1610 specific_flag = specifics[i].flag;
1614 /* Check to see if the string matches a language name.
1615 Note - we rely upon the alpha-sorted nature of the entries in
1616 the lang_names array, specifically that shorter names appear
1617 before their longer variants. (i.e. C before C++). That way
1618 when we are attempting to match --help=c for example we will
1619 match with C first and not C++. */
1620 for (i = 0, lang_flag = 0; i < cl_lang_count; i++)
1621 if (strncasecmp (a, lang_names[i], len) == 0)
1623 lang_flag = 1U << i;
1627 if (specific_flag != 0)
1630 * pflags |= specific_flag;
1633 /* The option's argument matches both the start of a
1634 language name and the start of an option class name.
1635 We have a special case for when the user has
1636 specified "--help=c", but otherwise we have to issue
1638 if (strncasecmp (a, "c", len) == 0)
1639 * pflags |= lang_flag;
1642 "warning: --help argument %.*s is ambiguous, please be more specific\n",
1646 else if (lang_flag != 0)
1647 * pflags |= lang_flag;
1650 "warning: unrecognized argument to --help= option: %.*s\n",
1659 print_specific_help (include_flags, exclude_flags, 0);
1660 exit_after_options = true;
1665 exit_after_options = true;
1671 /* Currently handled in a prescan. */
1675 enable_warning_as_error (arg, value, lang_mask, handlers, global_dc);
1678 case OPT_Wlarger_than_:
1679 larger_than_size = value;
1680 warn_larger_than = value != -1;
1683 case OPT_Wfatal_errors:
1684 global_dc->fatal_errors = value;
1687 case OPT_Wframe_larger_than_:
1688 frame_larger_than_size = value;
1689 warn_frame_larger_than = value != -1;
1692 case OPT_Wstrict_aliasing:
1693 set_Wstrict_aliasing (value);
1696 case OPT_Wstrict_aliasing_:
1697 warn_strict_aliasing = value;
1700 case OPT_Wstrict_overflow:
1701 warn_strict_overflow = (value
1702 ? (int) WARN_STRICT_OVERFLOW_CONDITIONAL
1706 case OPT_Wstrict_overflow_:
1707 warn_strict_overflow = value;
1710 case OPT_Wsystem_headers:
1711 global_dc->dc_warn_system_headers = value;
1715 warn_unused = value;
1719 aux_info_file_name = arg;
1720 flag_gen_aux_info = 1;
1724 aux_base_name = arg;
1727 case OPT_auxbase_strip:
1729 char *tmp = xstrdup (arg);
1730 strip_off_ending (tmp, strlen (tmp));
1732 aux_base_name = tmp;
1737 decode_d_option (arg);
1741 dump_base_name = arg;
1745 dump_dir_name = arg;
1748 case OPT_falign_functions_:
1749 align_functions = value;
1752 case OPT_falign_jumps_:
1753 align_jumps = value;
1756 case OPT_falign_labels_:
1757 align_labels = value;
1760 case OPT_falign_loops_:
1761 align_loops = value;
1764 case OPT_fcall_used_:
1765 fix_register (arg, 0, 1);
1768 case OPT_fcall_saved_:
1769 fix_register (arg, 0, 0);
1772 case OPT_fcompare_debug_second:
1773 flag_compare_debug = value;
1777 dbg_cnt_process_opt (arg);
1780 case OPT_fdbg_cnt_list:
1781 dbg_cnt_list_all_counters ();
1784 case OPT_fdebug_prefix_map_:
1785 add_debug_prefix_map (arg);
1788 case OPT_fdiagnostics_show_location_:
1789 if (!strcmp (arg, "once"))
1790 diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
1791 else if (!strcmp (arg, "every-line"))
1792 diagnostic_prefixing_rule (global_dc)
1793 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE;
1798 case OPT_fdiagnostics_show_option:
1799 global_dc->show_option_requested = value;
1803 if (!dump_switch_p (arg))
1807 case OPT_fexcess_precision_:
1808 if (!strcmp (arg, "fast"))
1809 flag_excess_precision_cmdline = EXCESS_PRECISION_FAST;
1810 else if (!strcmp (arg, "standard"))
1811 flag_excess_precision_cmdline = EXCESS_PRECISION_STANDARD;
1813 error ("unknown excess precision style \"%s\"", arg);
1816 case OPT_ffast_math:
1817 set_fast_math_flags (value);
1820 case OPT_funsafe_math_optimizations:
1821 set_unsafe_math_optimizations_flags (value);
1825 fix_register (arg, 1, 1);
1828 case OPT_finline_limit_:
1829 set_param_value ("max-inline-insns-single", value / 2);
1830 set_param_value ("max-inline-insns-auto", value / 2);
1833 case OPT_finstrument_functions_exclude_function_list_:
1834 add_comma_separated_to_vector
1835 (&flag_instrument_functions_exclude_functions, arg);
1838 case OPT_finstrument_functions_exclude_file_list_:
1839 add_comma_separated_to_vector
1840 (&flag_instrument_functions_exclude_files, arg);
1843 case OPT_fmessage_length_:
1844 pp_set_line_maximum_length (global_dc->printer, value);
1847 case OPT_fpack_struct_:
1848 if (value <= 0 || (value & (value - 1)) || value > 16)
1849 error ("structure alignment must be a small power of two, not %d", value);
1852 initial_max_fld_align = value;
1853 maximum_field_alignment = value * BITS_PER_UNIT;
1858 #ifdef ENABLE_PLUGIN
1859 add_new_plugin (arg);
1861 error ("Plugin support is disabled. Configure with --enable-plugin.");
1865 case OPT_fplugin_arg_:
1866 #ifdef ENABLE_PLUGIN
1867 parse_plugin_arg_opt (arg);
1869 error ("Plugin support is disabled. Configure with --enable-plugin.");
1873 case OPT_fprofile_dir_:
1874 profile_data_prefix = xstrdup (arg);
1877 case OPT_fprofile_use_:
1878 profile_data_prefix = xstrdup (arg);
1879 flag_profile_use = true;
1881 /* No break here - do -fprofile-use processing. */
1882 case OPT_fprofile_use:
1883 if (!opts_set->x_flag_branch_probabilities)
1884 flag_branch_probabilities = value;
1885 if (!opts_set->x_flag_profile_values)
1886 flag_profile_values = value;
1887 if (!opts_set->x_flag_unroll_loops)
1888 flag_unroll_loops = value;
1889 if (!opts_set->x_flag_peel_loops)
1890 flag_peel_loops = value;
1891 if (!opts_set->x_flag_tracer)
1892 flag_tracer = value;
1893 if (!opts_set->x_flag_value_profile_transformations)
1894 flag_value_profile_transformations = value;
1895 if (!opts_set->x_flag_inline_functions)
1896 flag_inline_functions = value;
1897 if (!opts_set->x_flag_ipa_cp)
1898 flag_ipa_cp = value;
1899 if (!opts_set->x_flag_ipa_cp_clone
1900 && value && flag_ipa_cp)
1901 flag_ipa_cp_clone = value;
1902 if (!opts_set->x_flag_predictive_commoning)
1903 flag_predictive_commoning = value;
1904 if (!opts_set->x_flag_unswitch_loops)
1905 flag_unswitch_loops = value;
1906 if (!opts_set->x_flag_gcse_after_reload)
1907 flag_gcse_after_reload = value;
1910 case OPT_fprofile_generate_:
1911 profile_data_prefix = xstrdup (arg);
1913 /* No break here - do -fprofile-generate processing. */
1914 case OPT_fprofile_generate:
1915 if (!opts_set->x_profile_arc_flag)
1916 profile_arc_flag = value;
1917 if (!opts_set->x_flag_profile_values)
1918 flag_profile_values = value;
1919 if (!opts_set->x_flag_value_profile_transformations)
1920 flag_value_profile_transformations = value;
1921 if (!opts_set->x_flag_inline_functions)
1922 flag_inline_functions = value;
1925 case OPT_fshow_column:
1926 global_dc->show_column = value;
1929 case OPT_fvisibility_:
1931 if (!strcmp(arg, "default"))
1932 default_visibility = VISIBILITY_DEFAULT;
1933 else if (!strcmp(arg, "internal"))
1934 default_visibility = VISIBILITY_INTERNAL;
1935 else if (!strcmp(arg, "hidden"))
1936 default_visibility = VISIBILITY_HIDDEN;
1937 else if (!strcmp(arg, "protected"))
1938 default_visibility = VISIBILITY_PROTECTED;
1940 error ("unrecognized visibility value \"%s\"", arg);
1944 case OPT_frandom_seed:
1945 /* The real switch is -fno-random-seed. */
1948 set_random_seed (NULL);
1951 case OPT_frandom_seed_:
1952 set_random_seed (arg);
1955 case OPT_fsched_verbose_:
1956 #ifdef INSN_SCHEDULING
1957 fix_sched_param ("verbose", arg);
1963 case OPT_fsched_stalled_insns_:
1964 flag_sched_stalled_insns = value;
1965 if (flag_sched_stalled_insns == 0)
1966 flag_sched_stalled_insns = -1;
1969 case OPT_fsched_stalled_insns_dep_:
1970 flag_sched_stalled_insns_dep = value;
1973 case OPT_fstack_check_:
1974 if (!strcmp (arg, "no"))
1975 flag_stack_check = NO_STACK_CHECK;
1976 else if (!strcmp (arg, "generic"))
1977 /* This is the old stack checking method. */
1978 flag_stack_check = STACK_CHECK_BUILTIN
1979 ? FULL_BUILTIN_STACK_CHECK
1980 : GENERIC_STACK_CHECK;
1981 else if (!strcmp (arg, "specific"))
1982 /* This is the new stack checking method. */
1983 flag_stack_check = STACK_CHECK_BUILTIN
1984 ? FULL_BUILTIN_STACK_CHECK
1985 : STACK_CHECK_STATIC_BUILTIN
1986 ? STATIC_BUILTIN_STACK_CHECK
1987 : GENERIC_STACK_CHECK;
1989 warning (0, "unknown stack check parameter \"%s\"", arg);
1992 case OPT_fstack_limit:
1993 /* The real switch is -fno-stack-limit. */
1996 stack_limit_rtx = NULL_RTX;
1999 case OPT_fstack_limit_register_:
2001 int reg = decode_reg_name (arg);
2003 error ("unrecognized register name \"%s\"", arg);
2005 stack_limit_rtx = gen_rtx_REG (Pmode, reg);
2009 case OPT_fstack_limit_symbol_:
2010 stack_limit_rtx = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (arg));
2013 case OPT_ftree_vectorizer_verbose_:
2014 vect_set_verbosity_level (arg);
2017 case OPT_ftls_model_:
2018 if (!strcmp (arg, "global-dynamic"))
2019 flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC;
2020 else if (!strcmp (arg, "local-dynamic"))
2021 flag_tls_default = TLS_MODEL_LOCAL_DYNAMIC;
2022 else if (!strcmp (arg, "initial-exec"))
2023 flag_tls_default = TLS_MODEL_INITIAL_EXEC;
2024 else if (!strcmp (arg, "local-exec"))
2025 flag_tls_default = TLS_MODEL_LOCAL_EXEC;
2027 warning (0, "unknown tls-model \"%s\"", arg);
2030 case OPT_fira_algorithm_:
2031 if (!strcmp (arg, "CB"))
2032 flag_ira_algorithm = IRA_ALGORITHM_CB;
2033 else if (!strcmp (arg, "priority"))
2034 flag_ira_algorithm = IRA_ALGORITHM_PRIORITY;
2036 warning (0, "unknown ira algorithm \"%s\"", arg);
2039 case OPT_fira_region_:
2040 if (!strcmp (arg, "one"))
2041 flag_ira_region = IRA_REGION_ONE;
2042 else if (!strcmp (arg, "all"))
2043 flag_ira_region = IRA_REGION_ALL;
2044 else if (!strcmp (arg, "mixed"))
2045 flag_ira_region = IRA_REGION_MIXED;
2047 warning (0, "unknown ira region \"%s\"", arg);
2050 case OPT_fira_verbose_:
2051 flag_ira_verbose = value;
2055 set_debug_level (NO_DEBUG, DEFAULT_GDB_EXTENSIONS, arg);
2059 set_debug_level (SDB_DEBUG, false, arg);
2063 if (value < 2 || value > 4)
2064 error ("dwarf version %d is not supported", value);
2066 dwarf_version = value;
2067 set_debug_level (DWARF2_DEBUG, false, "");
2071 set_debug_level (NO_DEBUG, 2, arg);
2076 set_debug_level (DBX_DEBUG, code == OPT_gstabs_, arg);
2080 set_debug_level (VMS_DEBUG, false, arg);
2085 set_debug_level (XCOFF_DEBUG, code == OPT_gxcoff_, arg);
2089 asm_file_name = arg;
2092 case OPT_pedantic_errors:
2093 flag_pedantic_errors = pedantic = 1;
2094 global_dc->pedantic_errors = 1;
2106 global_dc->dc_inhibit_warnings = true;
2109 case OPT_fuse_linker_plugin:
2110 /* No-op. Used by the driver and passed to us because it starts with f.*/
2114 /* If the flag was handled in a standard way, assume the lack of
2115 processing here is intentional. */
2116 gcc_assert (option_flag_var (scode, opts));
2123 /* Handle --param NAME=VALUE. */
2125 handle_param (const char *carg)
2130 arg = xstrdup (carg);
2131 equal = strchr (arg, '=');
2133 error ("%s: --param arguments should be of the form NAME=VALUE", arg);
2136 value = integral_argument (equal + 1);
2138 error ("invalid --param value %qs", equal + 1);
2142 set_param_value (arg, value);
2149 /* Used to set the level of strict aliasing warnings,
2150 when no level is specified (i.e., when -Wstrict-aliasing, and not
2151 -Wstrict-aliasing=level was given).
2152 ONOFF is assumed to take value 1 when -Wstrict-aliasing is specified,
2153 and 0 otherwise. After calling this function, wstrict_aliasing will be
2154 set to the default value of -Wstrict_aliasing=level, currently 3. */
2156 set_Wstrict_aliasing (int onoff)
2158 gcc_assert (onoff == 0 || onoff == 1);
2160 warn_strict_aliasing = 3;
2162 warn_strict_aliasing = 0;
2165 /* The following routines are useful in setting all the flags that
2166 -ffast-math and -fno-fast-math imply. */
2168 set_fast_math_flags (int set)
2170 flag_unsafe_math_optimizations = set;
2171 set_unsafe_math_optimizations_flags (set);
2172 flag_finite_math_only = set;
2173 flag_errno_math = !set;
2176 flag_signaling_nans = 0;
2177 flag_rounding_math = 0;
2178 flag_cx_limited_range = 1;
2182 /* When -funsafe-math-optimizations is set the following
2183 flags are set as well. */
2185 set_unsafe_math_optimizations_flags (int set)
2187 flag_trapping_math = !set;
2188 flag_signed_zeros = !set;
2189 flag_associative_math = set;
2190 flag_reciprocal_math = set;
2193 /* Return true iff flags are set as if -ffast-math. */
2195 fast_math_flags_set_p (void)
2197 return (!flag_trapping_math
2198 && flag_unsafe_math_optimizations
2199 && flag_finite_math_only
2200 && !flag_signed_zeros
2201 && !flag_errno_math);
2204 /* Return true iff flags are set as if -ffast-math but using the flags stored
2205 in the struct cl_optimization structure. */
2207 fast_math_flags_struct_set_p (struct cl_optimization *opt)
2209 return (!opt->x_flag_trapping_math
2210 && opt->x_flag_unsafe_math_optimizations
2211 && opt->x_flag_finite_math_only
2212 && !opt->x_flag_signed_zeros
2213 && !opt->x_flag_errno_math);
2216 /* Handle a debug output -g switch. EXTENDED is true or false to support
2217 extended output (2 is special and means "-ggdb" was given). */
2219 set_debug_level (enum debug_info_type type, int extended, const char *arg)
2221 static bool type_explicit;
2223 use_gnu_debug_info_extensions = extended;
2225 if (type == NO_DEBUG)
2227 if (write_symbols == NO_DEBUG)
2229 write_symbols = PREFERRED_DEBUGGING_TYPE;
2233 #ifdef DWARF2_DEBUGGING_INFO
2234 write_symbols = DWARF2_DEBUG;
2235 #elif defined DBX_DEBUGGING_INFO
2236 write_symbols = DBX_DEBUG;
2240 if (write_symbols == NO_DEBUG)
2241 warning (0, "target system does not support debug output");
2246 /* Does it conflict with an already selected type? */
2247 if (type_explicit && write_symbols != NO_DEBUG && type != write_symbols)
2248 error ("debug format \"%s\" conflicts with prior selection",
2249 debug_type_names[type]);
2250 write_symbols = type;
2251 type_explicit = true;
2254 /* A debug flag without a level defaults to level 2. */
2257 if (!debug_info_level)
2258 debug_info_level = DINFO_LEVEL_NORMAL;
2262 int argval = integral_argument (arg);
2264 error ("unrecognised debug output level \"%s\"", arg);
2265 else if (argval > 3)
2266 error ("debug output level %s is too high", arg);
2268 debug_info_level = (enum debug_info_level) argval;
2272 /* Return 1 if option OPT_IDX is enabled in OPTS, 0 if it is disabled,
2273 or -1 if it isn't a simple on-off switch. */
2276 option_enabled (int opt_idx, void *opts)
2278 const struct cl_option *option = &(cl_options[opt_idx]);
2279 struct gcc_options *optsg = (struct gcc_options *) opts;
2280 void *flag_var = option_flag_var (opt_idx, optsg);
2283 switch (option->var_type)
2286 return *(int *) flag_var != 0;
2289 return *(int *) flag_var == option->var_value;
2291 case CLVC_BIT_CLEAR:
2292 return (*(int *) flag_var & option->var_value) == 0;
2295 return (*(int *) flag_var & option->var_value) != 0;
2303 /* Fill STATE with the current state of option OPTION in OPTS. Return
2304 true if there is some state to store. */
2307 get_option_state (struct gcc_options *opts, int option,
2308 struct cl_option_state *state)
2310 void *flag_var = option_flag_var (option, opts);
2315 switch (cl_options[option].var_type)
2319 state->data = flag_var;
2320 state->size = sizeof (int);
2323 case CLVC_BIT_CLEAR:
2325 state->ch = option_enabled (option, opts);
2326 state->data = &state->ch;
2331 state->data = *(const char **) flag_var;
2332 if (state->data == 0)
2334 state->size = strlen ((const char *) state->data) + 1;
2340 /* Callback function, called when -Werror= enables a warning. */
2342 static void (*warning_as_error_callback) (int) = NULL;
2344 /* Register a callback for enable_warning_as_error calls. */
2347 register_warning_as_error_callback (void (*callback) (int))
2349 gcc_assert (warning_as_error_callback == NULL || callback == NULL);
2350 warning_as_error_callback = callback;
2353 /* Enable (or disable if VALUE is 0) a warning option ARG (language
2354 mask LANG_MASK, option handlers HANDLERS) as an error for
2355 diagnostic context DC (possibly NULL). This is used by
2359 enable_warning_as_error (const char *arg, int value, unsigned int lang_mask,
2360 const struct cl_option_handlers *handlers,
2361 diagnostic_context *dc)
2366 new_option = XNEWVEC (char, strlen (arg) + 2);
2367 new_option[0] = 'W';
2368 strcpy (new_option + 1, arg);
2369 option_index = find_opt (new_option, lang_mask);
2370 if (option_index == OPT_SPECIAL_unknown)
2372 error ("-Werror=%s: No option -%s", arg, new_option);
2376 const struct cl_option *option = &cl_options[option_index];
2377 const diagnostic_t kind = value ? DK_ERROR : DK_WARNING;
2379 if (option->alias_target != N_OPTS)
2380 option_index = option->alias_target;
2381 if (option_index == OPT_SPECIAL_ignore)
2384 diagnostic_classify_diagnostic (dc, option_index, kind,
2386 if (kind == DK_ERROR)
2388 const struct cl_option * const option = cl_options + option_index;
2390 /* -Werror=foo implies -Wfoo. */
2391 if (option->var_type == CLVC_BOOLEAN)
2392 handle_generated_option (&global_options, &global_options_set,
2393 option_index, NULL, value, lang_mask,
2394 (int)kind, handlers,
2397 if (warning_as_error_callback)
2398 warning_as_error_callback (option_index);
2404 /* Return malloced memory for the name of the option OPTION_INDEX
2405 which enabled a diagnostic (context CONTEXT), originally of type
2406 ORIG_DIAG_KIND but possibly converted to DIAG_KIND by options such
2410 option_name (diagnostic_context *context, int option_index,
2411 diagnostic_t orig_diag_kind, diagnostic_t diag_kind)
2415 /* A warning classified as an error. */
2416 if ((orig_diag_kind == DK_WARNING || orig_diag_kind == DK_PEDWARN)
2417 && diag_kind == DK_ERROR)
2418 return concat (cl_options[OPT_Werror_].opt_text,
2419 /* Skip over "-W". */
2420 cl_options[option_index].opt_text + 2,
2422 /* A warning with option. */
2424 return xstrdup (cl_options[option_index].opt_text);
2426 /* A warning without option classified as an error. */
2427 else if (orig_diag_kind == DK_WARNING || orig_diag_kind == DK_PEDWARN
2428 || diag_kind == DK_WARNING)
2430 if (context->warning_as_error_requested)
2431 return xstrdup (cl_options[OPT_Werror].opt_text);
2433 return xstrdup (_("enabled by default"));