1 /* Command line option handling.
2 Copyright (C) 2002, 2003, 2004 Free Software Foundation, Inc.
3 Contributed by Neil Booth.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to the Free
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
25 #include "coretypes.h"
31 #include "langhooks.h"
37 #include "diagnostic.h"
38 #include "tm_p.h" /* For OPTIMIZATION_OPTIONS. */
39 #include "insn-attr.h" /* For INSN_SCHEDULING. */
42 /* Value of the -G xx switch, and whether it was passed or not. */
43 unsigned HOST_WIDE_INT g_switch_value;
46 /* True if we should exit after parsing options. */
47 bool exit_after_options;
52 /* Print various extra warnings. -W/-Wextra. */
55 /* Don't print warning messages. -w. */
56 bool inhibit_warnings;
58 /* Treat warnings as errors. -Werror. */
59 bool warnings_are_errors;
61 /* Warn if a function returns an aggregate, since there are often
62 incompatible calling conventions for doing this. */
63 bool warn_aggregate_return;
65 /* Nonzero means warn about pointer casts that increase the required
66 alignment of the target type (and might therefore lead to a crash
67 due to a misaligned access). */
70 /* Nonzero means warn about uses of __attribute__((deprecated))
72 bool warn_deprecated_decl = true;
74 /* Warn when an optimization pass is disabled. */
75 bool warn_disabled_optimization;
77 /* Nonzero means warn if inline function is too large. */
80 /* True to warn about any objects definitions whose size is larger
81 than N bytes. Also want about function definitions whose returned
82 values are larger than N bytes, where N is `larger_than_size'. */
83 bool warn_larger_than;
84 HOST_WIDE_INT larger_than_size;
86 /* Warn about functions which might be candidates for attribute noreturn. */
87 bool warn_missing_noreturn;
89 /* True to warn about code which is never reached. */
92 /* Warn if packed attribute on struct is unnecessary and inefficient. */
95 /* Warn when gcc pads a structure to an alignment boundary. */
98 /* True means warn about all declarations which shadow others. */
101 /* Nonzero means warn about constructs which might not be
102 strict-aliasing safe. */
103 int warn_strict_aliasing;
105 /* True to warn if a switch on an enum, that does not have a default
106 case, fails to have a case for every enum value. */
109 /* Warn if a switch does not have a default case. */
110 bool warn_switch_default;
112 /* Warn if a switch on an enum fails to have a case for every enum
113 value (regardless of the presence or otherwise of a default case). */
114 bool warn_switch_enum;
116 /* Don't suppress warnings from system headers. -Wsystem-headers. */
117 bool warn_system_headers;
119 /* True to warn about variables used before they are initialized. */
120 int warn_uninitialized;
122 /* True to warn about unused variables, functions et.al. */
123 bool warn_unused_function;
124 bool warn_unused_label;
125 bool warn_unused_parameter;
126 bool warn_unused_variable;
127 bool warn_unused_value;
129 /* Hack for cooperation between set_Wunused and set_Wextra. */
130 static bool maybe_warn_unused_parameter;
132 /* Type(s) of debugging information we are producing (if any). See
133 flags.h for the definitions of the different possible types of
134 debugging information. */
135 enum debug_info_type write_symbols = NO_DEBUG;
137 /* Level of debugging information we are producing. See flags.h for
138 the definitions of the different possible levels. */
139 enum debug_info_level debug_info_level = DINFO_LEVEL_NONE;
141 /* Nonzero means use GNU-only extensions in the generated symbolic
142 debugging information. Currently, this only has an effect when
143 write_symbols is set to DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG. */
144 bool use_gnu_debug_info_extensions;
146 /* Columns of --help display. */
147 static unsigned int columns = 80;
149 /* What to print when a switch has no documentation. */
150 static const char undocumented_msg[] = N_("This switch lacks documentation");
152 /* Used for bookkeeping on whether user set these flags so
153 -fprofile-use/-fprofile-generate does not use them. */
154 static bool profile_arc_flag_set, flag_profile_values_set;
155 static bool flag_unroll_loops_set, flag_tracer_set;
156 static bool flag_value_profile_transformations_set;
157 static bool flag_peel_loops_set, flag_branch_probabilities_set;
159 /* Input file names. */
160 const char **in_fnames;
161 unsigned num_in_fnames;
163 static size_t find_opt (const char *, int);
164 static int common_handle_option (size_t scode, const char *arg, int value);
165 static void handle_param (const char *);
166 static void set_Wextra (int);
167 static unsigned int handle_option (const char **argv, unsigned int lang_mask);
168 static char *write_langs (unsigned int lang_mask);
169 static void complain_wrong_lang (const char *, const struct cl_option *,
170 unsigned int lang_mask);
171 static void handle_options (unsigned int, const char **, unsigned int);
172 static void wrap_help (const char *help, const char *item, unsigned int);
173 static void print_help (void);
174 static void print_param_help (void);
175 static void print_filtered_help (unsigned int flag);
176 static unsigned int print_switch (const char *text, unsigned int indent);
177 static void set_debug_level (enum debug_info_type type, int extended,
180 /* Perform a binary search to find which option the command-line INPUT
181 matches. Returns its index in the option array, and N_OPTS
182 (cl_options_count) on failure.
184 This routine is quite subtle. A normal binary search is not good
185 enough because some options can be suffixed with an argument, and
186 multiple sub-matches can occur, e.g. input of "-pedantic" matching
187 the initial substring of "-pedantic-errors".
189 A more complicated example is -gstabs. It should match "-g" with
190 an argument of "stabs". Suppose, however, that the number and list
191 of switches are such that the binary search tests "-gen-decls"
192 before having tested "-g". This doesn't match, and as "-gen-decls"
193 is less than "-gstabs", it will become the lower bound of the
194 binary search range, and "-g" will never be seen. To resolve this
195 issue, opts.sh makes "-gen-decls" point, via the back_chain member,
196 to "-g" so that failed searches that end between "-gen-decls" and
197 the lexicographically subsequent switch know to go back and see if
198 "-g" causes a match (which it does in this example).
200 This search is done in such a way that the longest match for the
201 front end in question wins. If there is no match for the current
202 front end, the longest match for a different front end is returned
203 (or N_OPTS if none) and the caller emits an error message. */
205 find_opt (const char *input, int lang_mask)
207 size_t mn, mx, md, opt_len;
208 size_t match_wrong_lang;
212 mx = cl_options_count;
214 /* Find mn such this lexicographical inequality holds:
215 cl_options[mn] <= input < cl_options[mn + 1]. */
219 opt_len = cl_options[md].opt_len;
220 comp = strncmp (input, cl_options[md].opt_text + 1, opt_len);
228 /* This is the switch that is the best match but for a different
229 front end, or cl_options_count if there is no match at all. */
230 match_wrong_lang = cl_options_count;
232 /* Backtrace the chain of possible matches, returning the longest
233 one, if any, that fits best. With current GCC switches, this
234 loop executes at most twice. */
237 const struct cl_option *opt = &cl_options[mn];
239 /* Is this switch a prefix of the input? */
240 if (!strncmp (input, opt->opt_text + 1, opt->opt_len))
242 /* If language is OK, and the match is exact or the switch
243 takes a joined argument, return it. */
244 if ((opt->flags & lang_mask)
245 && (input[opt->opt_len] == '\0' || (opt->flags & CL_JOINED)))
248 /* If we haven't remembered a prior match, remember this
249 one. Any prior match is necessarily better. */
250 if (match_wrong_lang == cl_options_count)
251 match_wrong_lang = mn;
254 /* Try the next possibility. This is cl_options_count if there
256 mn = opt->back_chain;
258 while (mn != cl_options_count);
260 /* Return the best wrong match, or cl_options_count if none. */
261 return match_wrong_lang;
264 /* If ARG is a non-negative integer made up solely of digits, return its
265 value, otherwise return -1. */
267 integral_argument (const char *arg)
271 while (*p && ISDIGIT (*p))
280 /* Return a malloced slash-separated list of languages in MASK. */
282 write_langs (unsigned int mask)
284 unsigned int n = 0, len = 0;
285 const char *lang_name;
288 for (n = 0; (lang_name = lang_names[n]) != 0; n++)
289 if (mask & (1U << n))
290 len += strlen (lang_name) + 1;
292 result = xmalloc (len);
294 for (n = 0; (lang_name = lang_names[n]) != 0; n++)
295 if (mask & (1U << n))
299 strcpy (result + len, lang_name);
300 len += strlen (lang_name);
308 /* Complain that switch OPT_INDEX does not apply to this front end. */
310 complain_wrong_lang (const char *text, const struct cl_option *option,
311 unsigned int lang_mask)
313 char *ok_langs, *bad_lang;
315 ok_langs = write_langs (option->flags);
316 bad_lang = write_langs (lang_mask);
318 /* Eventually this should become a hard error IMO. */
319 warning ("command line option \"%s\" is valid for %s but not for %s",
320 text, ok_langs, bad_lang);
326 /* Handle the switch beginning at ARGV for the language indicated by
327 LANG_MASK. Returns the number of switches consumed. */
329 handle_option (const char **argv, unsigned int lang_mask)
332 const char *opt, *arg = 0;
335 unsigned int result = 0;
336 const struct cl_option *option;
340 /* Drop the "no-" from negative switches. */
341 if ((opt[1] == 'W' || opt[1] == 'f')
342 && opt[2] == 'n' && opt[3] == 'o' && opt[4] == '-')
344 size_t len = strlen (opt) - 3;
346 dup = xmalloc (len + 1);
349 memcpy (dup + 2, opt + 5, len - 2 + 1);
354 opt_index = find_opt (opt + 1, lang_mask | CL_COMMON);
355 if (opt_index == cl_options_count)
358 option = &cl_options[opt_index];
360 /* Reject negative form of switches that don't take negatives as
362 if (!value && (option->flags & CL_REJECT_NEGATIVE))
365 /* We've recognized this switch. */
368 /* Sort out any argument the switch takes. */
369 if (option->flags & CL_JOINED)
371 /* Have arg point to the original switch. This is because
372 some code, such as disable_builtin_function, expects its
373 argument to be persistent until the program exits. */
374 arg = argv[0] + cl_options[opt_index].opt_len + 1;
376 arg += strlen ("no-");
378 if (*arg == '\0' && !(option->flags & CL_MISSING_OK))
380 if (option->flags & CL_SEPARATE)
386 /* Missing argument. */
390 else if (option->flags & CL_SEPARATE)
396 /* Now we've swallowed any potential argument, complain if this
397 is a switch for a different front end. */
398 if (!(option->flags & (lang_mask | CL_COMMON)))
400 complain_wrong_lang (argv[0], option, lang_mask);
404 if (arg == NULL && (option->flags & (CL_JOINED | CL_SEPARATE)))
406 if (!lang_hooks.missing_argument (opt, opt_index))
407 error ("missing argument to \"%s\"", opt);
411 /* If the switch takes an integer, convert it. */
412 if (arg && (option->flags & CL_UINTEGER))
414 value = integral_argument (arg);
417 error ("argument to \"%s\" should be a non-negative integer",
423 if (option->flags & lang_mask)
424 if (lang_hooks.handle_option (opt_index, arg, value) == 0)
427 if (result && (option->flags & CL_COMMON))
428 if (common_handle_option (opt_index, arg, value) == 0)
437 /* Decode and handle the vector of command line options. LANG_MASK
438 contains has a single bit set representing the current
441 handle_options (unsigned int argc, const char **argv, unsigned int lang_mask)
445 for (i = 1; i < argc; i += n)
447 const char *opt = argv[i];
449 /* Interpret "-" or a non-switch as a file name. */
450 if (opt[0] != '-' || opt[1] == '\0')
452 if (main_input_filename == NULL)
453 main_input_filename = opt;
454 add_input_filename (opt);
459 n = handle_option (argv + i, lang_mask);
464 error ("unrecognized command line option \"%s\"", opt);
469 /* Handle FILENAME from the command line. */
471 add_input_filename (const char *filename)
474 in_fnames = xrealloc (in_fnames, num_in_fnames * sizeof (in_fnames[0]));
475 in_fnames[num_in_fnames - 1] = filename;
478 /* Parse command line options and set default flag values. Do minimal
479 options processing. */
481 decode_options (unsigned int argc, const char **argv)
483 unsigned int i, lang_mask;
485 /* Perform language-specific options initialization. */
486 lang_mask = lang_hooks.init_options (argc, argv);
488 lang_hooks.initialize_diagnostics (global_dc);
490 /* Scan to see what optimization level has been specified. That will
491 determine the default value of many flags. */
492 for (i = 1; i < argc; i++)
494 if (!strcmp (argv[i], "-O"))
499 else if (argv[i][0] == '-' && argv[i][1] == 'O')
501 /* Handle -Os, -O2, -O3, -O69, ... */
502 const char *p = &argv[i][2];
504 if ((p[0] == 's') && (p[1] == 0))
508 /* Optimizing for size forces optimize to be 2. */
513 const int optimize_val = read_integral_parameter (p, p - 2, -1);
514 if (optimize_val != -1)
516 optimize = optimize_val;
525 flag_merge_constants = 0;
531 flag_thread_jumps = 1;
533 flag_delayed_branch = 1;
535 #ifdef CAN_DEBUG_WITHOUT_FP
536 flag_omit_frame_pointer = 1;
538 flag_guess_branch_prob = 1;
539 flag_cprop_registers = 1;
540 flag_loop_optimize = 1;
541 flag_if_conversion = 1;
542 flag_if_conversion2 = 1;
547 flag_crossjumping = 1;
548 flag_optimize_sibling_calls = 1;
549 flag_cse_follow_jumps = 1;
550 flag_cse_skip_blocks = 1;
552 flag_expensive_optimizations = 1;
553 flag_strength_reduce = 1;
554 flag_rerun_cse_after_loop = 1;
555 flag_rerun_loop_opt = 1;
556 flag_caller_saves = 1;
559 #ifdef INSN_SCHEDULING
560 flag_schedule_insns = 1;
561 flag_schedule_insns_after_reload = 1;
564 flag_strict_aliasing = 1;
565 flag_delete_null_pointer_checks = 1;
566 flag_reorder_blocks = 1;
567 flag_reorder_functions = 1;
568 flag_unit_at_a_time = 1;
573 flag_inline_functions = 1;
574 flag_rename_registers = 1;
575 flag_unswitch_loops = 1;
577 flag_gcse_after_reload = 1;
580 if (optimize < 2 || optimize_size)
587 /* Don't reorder blocks when optimizing for size because extra
588 jump insns may be created; also barrier may create extra padding.
590 More correctly we should have a block reordering mode that tried
591 to minimize the combined size of all the jumps. This would more
592 or less automatically remove extra jumps, but would also try to
593 use more short jumps instead of long jumps. */
594 flag_reorder_blocks = 0;
599 /* Inlining of very small functions usually reduces total size. */
600 set_param_value ("max-inline-insns-single", 5);
601 set_param_value ("max-inline-insns-auto", 5);
602 set_param_value ("max-inline-insns-rtl", 10);
603 flag_inline_functions = 1;
606 /* Initialize whether `char' is signed. */
607 flag_signed_char = DEFAULT_SIGNED_CHAR;
608 /* Initialize how much space enums occupy, by default. */
609 flag_short_enums = targetm.default_short_enums ();
611 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
614 set_target_switch ("");
616 /* Unwind tables are always present in an ABI-conformant IA-64
617 object file, so the default should be ON. */
618 #ifdef IA64_UNWIND_INFO
619 flag_unwind_tables = IA64_UNWIND_INFO;
622 #ifdef OPTIMIZATION_OPTIONS
623 /* Allow default optimizations to be specified on a per-machine basis. */
624 OPTIMIZATION_OPTIONS (optimize, optimize_size);
627 handle_options (argc, argv, lang_mask);
631 if (flag_pic && !flag_pie)
634 if (flag_no_inline == 2)
637 flag_really_no_inline = flag_no_inline;
639 /* Set flag_no_inline before the post_options () hook. The C front
640 ends use it to determine tree inlining defaults. FIXME: such
641 code should be lang-independent when all front ends use tree
642 inlining, in which case it, and this condition, should be moved
643 to the top of process_options() instead. */
646 /* Inlining does not work if not optimizing,
647 so force it not to be done. */
651 /* The c_decode_option function and decode_option hook set
652 this to `2' if -Wall is used, so we can avoid giving out
653 lots of errors for people who don't realize what -Wall does. */
654 if (warn_uninitialized == 1)
655 warning ("-Wuninitialized is not supported without -O");
658 if (flag_really_no_inline == 2)
659 flag_really_no_inline = flag_no_inline;
662 /* Handle target- and language-independent options. Return zero to
663 generate an "unknown option" message. */
665 common_handle_option (size_t scode, const char *arg,
666 int value ATTRIBUTE_UNUSED)
668 enum opt_code code = (enum opt_code) scode;
677 exit_after_options = true;
684 case OPT__target_help:
685 display_target_options ();
686 exit_after_options = true;
690 print_version (stderr, "");
691 exit_after_options = true;
695 g_switch_value = value;
701 /* Currently handled in a prescan. */
705 /* For backward compatibility, -W is the same as -Wextra. */
709 case OPT_Waggregate_return:
710 warn_aggregate_return = value;
713 case OPT_Wcast_align:
714 warn_cast_align = value;
717 case OPT_Wdeprecated_declarations:
718 warn_deprecated_decl = value;
721 case OPT_Wdisabled_optimization:
722 warn_disabled_optimization = value;
726 warnings_are_errors = value;
737 case OPT_Wlarger_than_:
738 larger_than_size = value;
739 warn_larger_than = value != -1;
742 case OPT_Wmissing_noreturn:
743 warn_missing_noreturn = value;
758 case OPT_Wstrict_aliasing:
759 case OPT_Wstrict_aliasing_:
760 warn_strict_aliasing = value;
767 case OPT_Wswitch_default:
768 warn_switch_default = value;
771 case OPT_Wswitch_enum:
772 warn_switch_enum = value;
775 case OPT_Wsystem_headers:
776 warn_system_headers = value;
779 case OPT_Wuninitialized:
780 warn_uninitialized = value;
783 case OPT_Wunreachable_code:
784 warn_notreached = value;
791 case OPT_Wunused_function:
792 warn_unused_function = value;
795 case OPT_Wunused_label:
796 warn_unused_label = value;
799 case OPT_Wunused_parameter:
800 warn_unused_parameter = value;
803 case OPT_Wunused_value:
804 warn_unused_value = value;
807 case OPT_Wunused_variable:
808 warn_unused_variable = value;
813 aux_info_file_name = arg;
814 flag_gen_aux_info = 1;
821 case OPT_auxbase_strip:
823 char *tmp = xstrdup (arg);
824 strip_off_ending (tmp, strlen (tmp));
831 decode_d_option (arg);
835 dump_base_name = arg;
839 flag_pic = value + value;
843 flag_pie = value + value;
846 case OPT_fabi_version_:
847 flag_abi_version = value;
850 case OPT_falign_functions:
851 align_functions = !value;
854 case OPT_falign_functions_:
855 align_functions = value;
858 case OPT_falign_jumps:
859 align_jumps = !value;
862 case OPT_falign_jumps_:
866 case OPT_falign_labels:
867 align_labels = !value;
870 case OPT_falign_labels_:
871 align_labels = value;
874 case OPT_falign_loops:
875 align_loops = !value;
878 case OPT_falign_loops_:
882 case OPT_fargument_alias:
883 flag_argument_noalias = !value;
886 case OPT_fargument_noalias:
887 flag_argument_noalias = value;
890 case OPT_fargument_noalias_global:
891 flag_argument_noalias = value + value;
894 case OPT_fasynchronous_unwind_tables:
895 flag_asynchronous_unwind_tables = value;
898 case OPT_fbounds_check:
899 flag_bounds_check = value;
902 case OPT_fbranch_count_reg:
903 flag_branch_on_count_reg = value;
906 case OPT_fbranch_probabilities:
907 flag_branch_probabilities_set = true;
908 flag_branch_probabilities = value;
911 case OPT_fbranch_target_load_optimize:
912 flag_branch_target_load_optimize = value;
915 case OPT_fbranch_target_load_optimize2:
916 flag_branch_target_load_optimize2 = value;
919 case OPT_fbtr_bb_exclusive:
920 flag_btr_bb_exclusive = value;
923 case OPT_fcall_used_:
924 fix_register (arg, 0, 1);
927 case OPT_fcall_saved_:
928 fix_register (arg, 0, 0);
931 case OPT_fcaller_saves:
932 flag_caller_saves = value;
936 flag_no_common = !value;
939 case OPT_fcprop_registers:
940 flag_cprop_registers = value;
943 case OPT_fcrossjumping:
944 flag_crossjumping = value;
947 case OPT_fcse_follow_jumps:
948 flag_cse_follow_jumps = value;
951 case OPT_fcse_skip_blocks:
952 flag_cse_skip_blocks = value;
955 case OPT_fdata_sections:
956 flag_data_sections = value;
960 flag_defer_pop = value;
963 case OPT_fdelayed_branch:
964 flag_delayed_branch = value;
967 case OPT_fdelete_null_pointer_checks:
968 flag_delete_null_pointer_checks = value;
971 case OPT_fdiagnostics_show_location_:
972 if (!strcmp (arg, "once"))
973 diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
974 else if (!strcmp (arg, "every-line"))
975 diagnostic_prefixing_rule (global_dc)
976 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE;
981 case OPT_fdump_unnumbered:
982 flag_dump_unnumbered = value;
985 case OPT_feliminate_dwarf2_dups:
986 flag_eliminate_dwarf2_dups = value;
989 case OPT_feliminate_unused_debug_types:
990 flag_eliminate_unused_debug_types = value;
993 case OPT_feliminate_unused_debug_symbols:
994 flag_debug_only_used_symbols = value;
997 case OPT_fexceptions:
998 flag_exceptions = value;
1001 case OPT_fexpensive_optimizations:
1002 flag_expensive_optimizations = value;
1005 case OPT_ffast_math:
1006 set_fast_math_flags (value);
1009 case OPT_ffinite_math_only:
1010 flag_finite_math_only = value;
1014 fix_register (arg, 1, 1);
1017 case OPT_ffunction_cse:
1018 flag_no_function_cse = !value;
1021 case OPT_ffloat_store:
1022 flag_float_store = value;
1025 case OPT_fforce_addr:
1026 flag_force_addr = value;
1029 case OPT_fforce_mem:
1030 flag_force_mem = value;
1033 case OPT_ffunction_sections:
1034 flag_function_sections = value;
1042 flag_gcse_lm = value;
1046 flag_gcse_sm = value;
1049 case OPT_fgcse_after_reload:
1050 flag_gcse_after_reload = value;
1054 flag_gcse_las = value;
1057 case OPT_fguess_branch_probability:
1058 flag_guess_branch_prob = value;
1062 flag_no_ident = !value;
1065 case OPT_fif_conversion:
1066 flag_if_conversion = value;
1069 case OPT_fif_conversion2:
1070 flag_if_conversion2 = value;
1073 case OPT_finhibit_size_directive:
1074 flag_inhibit_size_directive = value;
1078 flag_no_inline = !value;
1081 case OPT_finline_functions:
1082 flag_inline_functions = value;
1085 case OPT_finline_limit_:
1086 case OPT_finline_limit_eq:
1087 set_param_value ("max-inline-insns-single", value / 2);
1088 set_param_value ("max-inline-insns-auto", value / 2);
1089 set_param_value ("max-inline-insns-rtl", value);
1092 case OPT_finstrument_functions:
1093 flag_instrument_function_entry_exit = value;
1096 case OPT_fkeep_inline_functions:
1097 flag_keep_inline_functions =value;
1100 case OPT_fkeep_static_consts:
1101 flag_keep_static_consts = value;
1104 case OPT_fleading_underscore:
1105 flag_leading_underscore = value;
1108 case OPT_floop_optimize:
1109 flag_loop_optimize = value;
1112 case OPT_fmath_errno:
1113 flag_errno_math = value;
1116 case OPT_fmem_report:
1120 case OPT_fmerge_all_constants:
1121 flag_merge_constants = value + value;
1124 case OPT_fmerge_constants:
1125 flag_merge_constants = value;
1128 case OPT_fmessage_length_:
1129 pp_set_line_maximum_length (global_dc->printer, value);
1132 case OPT_fmove_all_movables:
1133 flag_move_all_movables = value;
1137 flag_new_regalloc = value;
1140 case OPT_fnon_call_exceptions:
1141 flag_non_call_exceptions = value;
1144 case OPT_fold_unroll_all_loops:
1145 flag_old_unroll_all_loops = value;
1148 case OPT_fold_unroll_loops:
1149 flag_old_unroll_loops = value;
1152 case OPT_fomit_frame_pointer:
1153 flag_omit_frame_pointer = value;
1156 case OPT_foptimize_register_move:
1157 flag_regmove = value;
1160 case OPT_foptimize_sibling_calls:
1161 flag_optimize_sibling_calls = value;
1164 case OPT_fpack_struct:
1165 flag_pack_struct = value;
1168 case OPT_fpeel_loops:
1169 flag_peel_loops_set = true;
1170 flag_peel_loops = value;
1173 case OPT_fpcc_struct_return:
1174 flag_pcc_struct_return = value;
1178 flag_no_peephole = !value;
1181 case OPT_fpeephole2:
1182 flag_peephole2 = value;
1193 case OPT_fprefetch_loop_arrays:
1194 flag_prefetch_loop_arrays = value;
1198 profile_flag = value;
1201 case OPT_fprofile_arcs:
1202 profile_arc_flag_set = true;
1203 profile_arc_flag = value;
1206 case OPT_fprofile_use:
1207 if (!flag_branch_probabilities_set)
1208 flag_branch_probabilities = value;
1209 if (!flag_profile_values_set)
1210 flag_profile_values = value;
1211 if (!flag_unroll_loops_set)
1212 flag_unroll_loops = value;
1213 if (!flag_peel_loops_set)
1214 flag_peel_loops = value;
1215 if (!flag_tracer_set)
1216 flag_tracer = value;
1217 if (!flag_value_profile_transformations_set)
1218 flag_value_profile_transformations = value;
1221 case OPT_fprofile_generate:
1222 if (!profile_arc_flag_set)
1223 profile_arc_flag = value;
1224 if (!flag_profile_values_set)
1225 flag_profile_values = value;
1226 if (!flag_value_profile_transformations_set)
1227 flag_value_profile_transformations = value;
1230 case OPT_fprofile_values:
1231 flag_profile_values_set = true;
1232 flag_profile_values = value;
1236 flag_value_profile_transformations_set = value;
1237 flag_value_profile_transformations = value;
1240 case OPT_frandom_seed:
1241 /* The real switch is -fno-random-seed. */
1244 flag_random_seed = NULL;
1247 case OPT_frandom_seed_:
1248 flag_random_seed = arg;
1251 case OPT_freduce_all_givs:
1252 flag_reduce_all_givs = value;
1255 case OPT_freg_struct_return:
1256 flag_pcc_struct_return = !value;
1260 flag_regmove = value;
1263 case OPT_frename_registers:
1264 flag_rename_registers = value;
1267 case OPT_freorder_blocks:
1268 flag_reorder_blocks = value;
1271 case OPT_freorder_functions:
1272 flag_reorder_functions = value;
1275 case OPT_frerun_cse_after_loop:
1276 flag_rerun_cse_after_loop = value;
1279 case OPT_frerun_loop_opt:
1280 flag_rerun_loop_opt = value;
1283 case OPT_frounding_math:
1284 flag_rounding_math = value;
1287 case OPT_fsched_interblock:
1288 flag_schedule_interblock = value;
1291 case OPT_fsched_spec:
1292 flag_schedule_speculative = value;
1295 case OPT_fsched_spec_load:
1296 flag_schedule_speculative_load = value;
1299 case OPT_fsched_spec_load_dangerous:
1300 flag_schedule_speculative_load_dangerous = value;
1303 case OPT_fsched_verbose_:
1304 #ifdef INSN_SCHEDULING
1305 fix_sched_param ("verbose", arg);
1311 case OPT_fsched2_use_superblocks:
1312 flag_sched2_use_superblocks = value;
1315 case OPT_fsched2_use_traces:
1316 flag_sched2_use_traces = value;
1319 case OPT_fschedule_insns:
1320 flag_schedule_insns = value;
1323 case OPT_fschedule_insns2:
1324 flag_schedule_insns_after_reload = value;
1327 case OPT_fsched_stalled_insns:
1328 flag_sched_stalled_insns = value;
1331 case OPT_fsched_stalled_insns_:
1332 flag_sched_stalled_insns = value;
1333 if (flag_sched_stalled_insns == 0)
1334 flag_sched_stalled_insns = -1;
1337 case OPT_fsched_stalled_insns_dep:
1338 flag_sched_stalled_insns_dep = 1;
1341 case OPT_fsched_stalled_insns_dep_:
1342 flag_sched_stalled_insns_dep = value;
1345 case OPT_fshared_data:
1346 flag_shared_data = value;
1349 case OPT_fsignaling_nans:
1350 flag_signaling_nans = value;
1353 case OPT_fsingle_precision_constant:
1354 flag_single_precision_constant = value;
1357 case OPT_fstack_check:
1358 flag_stack_check = value;
1361 case OPT_fstack_limit:
1362 /* The real switch is -fno-stack-limit. */
1365 stack_limit_rtx = NULL_RTX;
1368 case OPT_fstack_limit_register_:
1370 int reg = decode_reg_name (arg);
1372 error ("unrecognized register name \"%s\"", arg);
1374 stack_limit_rtx = gen_rtx_REG (Pmode, reg);
1378 case OPT_fstack_limit_symbol_:
1379 stack_limit_rtx = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (arg));
1382 case OPT_fstrength_reduce:
1383 flag_strength_reduce = value;
1386 case OPT_fstrict_aliasing:
1387 flag_strict_aliasing = value;
1390 case OPT_fsyntax_only:
1391 flag_syntax_only = value;
1394 case OPT_ftest_coverage:
1395 flag_test_coverage = value;
1398 case OPT_fthread_jumps:
1399 flag_thread_jumps = value;
1402 case OPT_ftime_report:
1403 time_report = value;
1406 case OPT_ftls_model_:
1407 if (!strcmp (arg, "global-dynamic"))
1408 flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC;
1409 else if (!strcmp (arg, "local-dynamic"))
1410 flag_tls_default = TLS_MODEL_LOCAL_DYNAMIC;
1411 else if (!strcmp (arg, "initial-exec"))
1412 flag_tls_default = TLS_MODEL_INITIAL_EXEC;
1413 else if (!strcmp (arg, "local-exec"))
1414 flag_tls_default = TLS_MODEL_LOCAL_EXEC;
1416 warning ("unknown tls-model \"%s\"", arg);
1420 flag_tracer_set = true;
1421 flag_tracer = value;
1424 case OPT_ftrapping_math:
1425 flag_trapping_math = value;
1432 case OPT_funit_at_a_time:
1433 flag_unit_at_a_time = value;
1436 case OPT_funroll_all_loops:
1437 flag_unroll_all_loops = value;
1440 case OPT_funroll_loops:
1441 flag_unroll_loops_set = true;
1442 flag_unroll_loops = value;
1445 case OPT_funsafe_math_optimizations:
1446 flag_unsafe_math_optimizations = value;
1449 case OPT_funswitch_loops:
1450 flag_unswitch_loops = value;
1453 case OPT_funwind_tables:
1454 flag_unwind_tables = value;
1457 case OPT_fvar_tracking:
1458 flag_var_tracking = value;
1461 case OPT_fverbose_asm:
1462 flag_verbose_asm = value;
1473 case OPT_fzero_initialized_in_bss:
1474 flag_zero_initialized_in_bss = value;
1478 set_debug_level (NO_DEBUG, DEFAULT_GDB_EXTENSIONS, arg);
1482 set_debug_level (SDB_DEBUG, false, arg);
1486 set_debug_level (DWARF2_DEBUG, false, arg);
1490 set_debug_level (NO_DEBUG, 2, arg);
1495 set_debug_level (DBX_DEBUG, code == OPT_gstabs_, arg);
1499 set_debug_level (VMS_DEBUG, false, arg);
1504 set_debug_level (XCOFF_DEBUG, code == OPT_gxcoff_, arg);
1508 set_target_switch (arg);
1512 asm_file_name = arg;
1523 case OPT_pedantic_errors:
1524 flag_pedantic_errors = pedantic = 1;
1536 inhibit_warnings = true;
1543 /* Handle --param NAME=VALUE. */
1545 handle_param (const char *carg)
1550 arg = xstrdup (carg);
1551 equal = strchr (arg, '=');
1553 error ("%s: --param arguments should be of the form NAME=VALUE", arg);
1556 value = integral_argument (equal + 1);
1558 error ("invalid --param value `%s'", equal + 1);
1562 set_param_value (arg, value);
1569 /* Handle -W and -Wextra. */
1571 set_Wextra (int setting)
1573 extra_warnings = setting;
1574 warn_unused_value = setting;
1575 warn_unused_parameter = (setting && maybe_warn_unused_parameter);
1577 /* We save the value of warn_uninitialized, since if they put
1578 -Wuninitialized on the command line, we need to generate a
1579 warning about not using it without also specifying -O. */
1581 warn_uninitialized = 0;
1582 else if (warn_uninitialized != 1)
1583 warn_uninitialized = 2;
1586 /* Initialize unused warning flags. */
1588 set_Wunused (int setting)
1590 warn_unused_function = setting;
1591 warn_unused_label = setting;
1592 /* Unused function parameter warnings are reported when either
1593 ``-Wextra -Wunused'' or ``-Wunused-parameter'' is specified.
1594 Thus, if -Wextra has already been seen, set warn_unused_parameter;
1595 otherwise set maybe_warn_extra_parameter, which will be picked up
1597 maybe_warn_unused_parameter = setting;
1598 warn_unused_parameter = (setting && extra_warnings);
1599 warn_unused_variable = setting;
1600 warn_unused_value = setting;
1603 /* The following routines are useful in setting all the flags that
1604 -ffast-math and -fno-fast-math imply. */
1606 set_fast_math_flags (int set)
1608 flag_trapping_math = !set;
1609 flag_unsafe_math_optimizations = set;
1610 flag_finite_math_only = set;
1611 flag_errno_math = !set;
1614 flag_signaling_nans = 0;
1615 flag_rounding_math = 0;
1619 /* Return true iff flags are set as if -ffast-math. */
1621 fast_math_flags_set_p (void)
1623 return (!flag_trapping_math
1624 && flag_unsafe_math_optimizations
1625 && flag_finite_math_only
1626 && !flag_errno_math);
1629 /* Handle a debug output -g switch. EXTENDED is true or false to support
1630 extended output (2 is special and means "-ggdb" was given). */
1632 set_debug_level (enum debug_info_type type, int extended, const char *arg)
1634 static bool type_explicit;
1636 use_gnu_debug_info_extensions = extended;
1638 if (type == NO_DEBUG)
1640 if (write_symbols == NO_DEBUG)
1642 write_symbols = PREFERRED_DEBUGGING_TYPE;
1646 #ifdef DWARF2_DEBUGGING_INFO
1647 write_symbols = DWARF2_DEBUG;
1648 #elif defined DBX_DEBUGGING_INFO
1649 write_symbols = DBX_DEBUG;
1653 if (write_symbols == NO_DEBUG)
1654 warning ("target system does not support debug output");
1659 /* Does it conflict with an already selected type? */
1660 if (type_explicit && write_symbols != NO_DEBUG && type != write_symbols)
1661 error ("debug format \"%s\" conflicts with prior selection",
1662 debug_type_names[type]);
1663 write_symbols = type;
1664 type_explicit = true;
1667 /* A debug flag without a level defaults to level 2. */
1670 if (!debug_info_level)
1671 debug_info_level = 2;
1675 debug_info_level = integral_argument (arg);
1676 if (debug_info_level == (unsigned int) -1)
1677 error ("unrecognised debug output level \"%s\"", arg);
1678 else if (debug_info_level > 3)
1679 error ("debug output level %s is too high", arg);
1683 /* Output --help text. */
1690 GET_ENVIRONMENT (p, "COLUMNS");
1693 int value = atoi (p);
1698 puts (_("The following options are language-independent:\n"));
1700 print_filtered_help (CL_COMMON);
1701 print_param_help ();
1703 for (i = 0; lang_names[i]; i++)
1705 printf (_("The %s front end recognizes the following options:\n\n"),
1707 print_filtered_help (1U << i);
1710 display_target_options ();
1713 /* Print the help for --param. */
1715 print_param_help (void)
1719 puts (_("The --param option recognizes the following as parameters:\n"));
1721 for (i = 0; i < LAST_PARAM; i++)
1723 const char *help = compiler_params[i].help;
1724 const char *param = compiler_params[i].option;
1726 if (help == NULL || *help == '\0')
1727 help = undocumented_msg;
1729 /* Get the translation. */
1732 wrap_help (help, param, strlen (param));
1738 /* Print help for a specific front-end, etc. */
1740 print_filtered_help (unsigned int flag)
1742 unsigned int i, len, filter, indent = 0;
1743 bool duplicates = false;
1744 const char *help, *opt, *tab;
1745 static char *printed;
1747 if (flag == CL_COMMON)
1751 printed = xmalloc (cl_options_count);
1752 memset (printed, 0, cl_options_count);
1756 /* Don't print COMMON options twice. */
1757 filter = flag | CL_COMMON;
1759 for (i = 0; i < cl_options_count; i++)
1761 if ((cl_options[i].flags & filter) != flag)
1764 /* Skip help for internal switches. */
1765 if (cl_options[i].flags & CL_UNDOCUMENTED)
1768 /* Skip switches that have already been printed, mark them to be
1773 indent = print_switch (cl_options[i].opt_text, indent);
1784 for (i = 0; i < cl_options_count; i++)
1786 if ((cl_options[i].flags & filter) != flag)
1789 /* Skip help for internal switches. */
1790 if (cl_options[i].flags & CL_UNDOCUMENTED)
1793 /* Skip switches that have already been printed. */
1799 help = cl_options[i].help;
1801 help = undocumented_msg;
1803 /* Get the translation. */
1806 tab = strchr (help, '\t');
1815 opt = cl_options[i].opt_text;
1819 wrap_help (help, opt, len);
1825 /* Output ITEM, of length ITEM_WIDTH, in the left column, followed by
1826 word-wrapped HELP in a second column. */
1828 print_switch (const char *text, unsigned int indent)
1830 unsigned int len = strlen (text) + 1; /* trailing comma */
1835 if (indent + len > columns)
1846 fputs (text, stdout);
1848 return indent + len + 1;
1851 /* Output ITEM, of length ITEM_WIDTH, in the left column, followed by
1852 word-wrapped HELP in a second column. */
1854 wrap_help (const char *help, const char *item, unsigned int item_width)
1856 unsigned int col_width = 27;
1857 unsigned int remaining, room, len;
1859 remaining = strlen (help);
1863 room = columns - 3 - MAX (col_width, item_width);
1872 for (i = 0; help[i]; i++)
1874 if (i >= room && len != remaining)
1878 else if ((help[i] == '-' || help[i] == '/')
1879 && help[i + 1] != ' '
1880 && i > 0 && ISALPHA (help[i - 1]))
1885 printf( " %-*.*s %.*s\n", col_width, item_width, item, len, help);
1887 while (help[len] == ' ')