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. */
41 /* Value of the -G xx switch, and whether it was passed or not. */
42 unsigned HOST_WIDE_INT g_switch_value;
45 /* True if we should exit after parsing options. */
46 bool exit_after_options;
51 /* Print various extra warnings. -W/-Wextra. */
54 /* Don't print warning messages. -w. */
55 bool inhibit_warnings;
57 /* Treat warnings as errors. -Werror. */
58 bool warnings_are_errors;
60 /* Warn if a function returns an aggregate, since there are often
61 incompatible calling conventions for doing this. */
62 bool warn_aggregate_return;
64 /* Nonzero means warn about pointer casts that increase the required
65 alignment of the target type (and might therefore lead to a crash
66 due to a misaligned access). */
69 /* Nonzero means warn about uses of __attribute__((deprecated))
71 bool warn_deprecated_decl = true;
73 /* Warn when an optimization pass is disabled. */
74 bool warn_disabled_optimization;
76 /* Nonzero means warn if inline function is too large. */
79 /* True to warn about any objects definitions whose size is larger
80 than N bytes. Also want about function definitions whose returned
81 values are larger than N bytes, where N is `larger_than_size'. */
82 bool warn_larger_than;
83 HOST_WIDE_INT larger_than_size;
85 /* Warn about functions which might be candidates for attribute noreturn. */
86 bool warn_missing_noreturn;
88 /* True to warn about code which is never reached. */
91 /* Warn if packed attribute on struct is unnecessary and inefficient. */
94 /* Warn when gcc pads a structure to an alignment boundary. */
97 /* True means warn about all declarations which shadow others. */
100 /* Nonzero means warn about constructs which might not be
101 strict-aliasing safe. */
102 bool warn_strict_aliasing;
104 /* True to warn if a switch on an enum, that does not have a default
105 case, fails to have a case for every enum value. */
108 /* Warn if a switch does not have a default case. */
109 bool warn_switch_default;
111 /* Warn if a switch on an enum fails to have a case for every enum
112 value (regardless of the presence or otherwise of a default case). */
113 bool warn_switch_enum;
115 /* Don't suppress warnings from system headers. -Wsystem-headers. */
116 bool warn_system_headers;
118 /* True to warn about variables used before they are initialized. */
119 int warn_uninitialized;
121 /* True to warn about unused variables, functions et.al. */
122 bool warn_unused_function;
123 bool warn_unused_label;
124 bool warn_unused_parameter;
125 bool warn_unused_variable;
126 bool warn_unused_value;
128 /* Hack for cooperation between set_Wunused and set_Wextra. */
129 static bool maybe_warn_unused_parameter;
131 /* Type(s) of debugging information we are producing (if any). See
132 flags.h for the definitions of the different possible types of
133 debugging information. */
134 enum debug_info_type write_symbols = NO_DEBUG;
136 /* Level of debugging information we are producing. See flags.h for
137 the definitions of the different possible levels. */
138 enum debug_info_level debug_info_level = DINFO_LEVEL_NONE;
140 /* Nonzero means use GNU-only extensions in the generated symbolic
141 debugging information. Currently, this only has an effect when
142 write_symbols is set to DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG. */
143 bool use_gnu_debug_info_extensions;
145 /* Columns of --help display. */
146 static unsigned int columns = 80;
148 /* What to print when a switch has no documentation. */
149 static const char undocumented_msg[] = N_("This switch lacks documentation");
151 /* Used for bookkeeping on whether user set these flags so
152 -fprofile-use/-fprofile-generate does not use them. */
153 static bool profile_arc_flag_set, flag_profile_values_set;
154 static bool flag_unroll_loops_set, flag_tracer_set;
155 static bool flag_value_profile_transformations_set;
156 static bool flag_peel_loops_set, flag_branch_probabilities_set;
158 /* Input file names. */
159 const char **in_fnames;
160 unsigned num_in_fnames;
162 static size_t find_opt (const char *, int);
163 static int common_handle_option (size_t scode, const char *arg, int value);
164 static void handle_param (const char *);
165 static void set_Wextra (int);
166 static unsigned int handle_option (const char **argv, unsigned int lang_mask);
167 static char *write_langs (unsigned int lang_mask);
168 static void complain_wrong_lang (const char *, const struct cl_option *,
169 unsigned int lang_mask);
170 static void handle_options (unsigned int, const char **, unsigned int);
171 static void wrap_help (const char *help, const char *item, unsigned int);
172 static void print_help (void);
173 static void print_param_help (void);
174 static void print_filtered_help (unsigned int flag);
175 static unsigned int print_switch (const char *text, unsigned int indent);
176 static void set_debug_level (enum debug_info_type type, int extended,
179 /* Perform a binary search to find which option the command-line INPUT
180 matches. Returns its index in the option array, and N_OPTS
181 (cl_options_count) on failure.
183 This routine is quite subtle. A normal binary search is not good
184 enough because some options can be suffixed with an argument, and
185 multiple sub-matches can occur, e.g. input of "-pedantic" matching
186 the initial substring of "-pedantic-errors".
188 A more complicated example is -gstabs. It should match "-g" with
189 an argument of "stabs". Suppose, however, that the number and list
190 of switches are such that the binary search tests "-gen-decls"
191 before having tested "-g". This doesn't match, and as "-gen-decls"
192 is less than "-gstabs", it will become the lower bound of the
193 binary search range, and "-g" will never be seen. To resolve this
194 issue, opts.sh makes "-gen-decls" point, via the back_chain member,
195 to "-g" so that failed searches that end between "-gen-decls" and
196 the lexicographically subsequent switch know to go back and see if
197 "-g" causes a match (which it does in this example).
199 This search is done in such a way that the longest match for the
200 front end in question wins. If there is no match for the current
201 front end, the longest match for a different front end is returned
202 (or N_OPTS if none) and the caller emits an error message. */
204 find_opt (const char *input, int lang_mask)
206 size_t mn, mx, md, opt_len;
207 size_t match_wrong_lang;
211 mx = cl_options_count;
213 /* Find mn such this lexicographical inequality holds:
214 cl_options[mn] <= input < cl_options[mn + 1]. */
218 opt_len = cl_options[md].opt_len;
219 comp = strncmp (input, cl_options[md].opt_text + 1, opt_len);
227 /* This is the switch that is the best match but for a different
228 front end, or cl_options_count if there is no match at all. */
229 match_wrong_lang = cl_options_count;
231 /* Backtrace the chain of possible matches, returning the longest
232 one, if any, that fits best. With current GCC switches, this
233 loop executes at most twice. */
236 const struct cl_option *opt = &cl_options[mn];
238 /* Is this switch a prefix of the input? */
239 if (!strncmp (input, opt->opt_text + 1, opt->opt_len))
241 /* If language is OK, and the match is exact or the switch
242 takes a joined argument, return it. */
243 if ((opt->flags & lang_mask)
244 && (input[opt->opt_len] == '\0' || (opt->flags & CL_JOINED)))
247 /* If we haven't remembered a prior match, remember this
248 one. Any prior match is necessarily better. */
249 if (match_wrong_lang == cl_options_count)
250 match_wrong_lang = mn;
253 /* Try the next possibility. This is cl_options_count if there
255 mn = opt->back_chain;
257 while (mn != cl_options_count);
259 /* Return the best wrong match, or cl_options_count if none. */
260 return match_wrong_lang;
263 /* If ARG is a non-negative integer made up solely of digits, return its
264 value, otherwise return -1. */
266 integral_argument (const char *arg)
270 while (*p && ISDIGIT (*p))
279 /* Return a malloced slash-separated list of languages in MASK. */
281 write_langs (unsigned int mask)
283 unsigned int n = 0, len = 0;
284 const char *lang_name;
287 for (n = 0; (lang_name = lang_names[n]) != 0; n++)
288 if (mask & (1U << n))
289 len += strlen (lang_name) + 1;
291 result = xmalloc (len);
293 for (n = 0; (lang_name = lang_names[n]) != 0; n++)
294 if (mask & (1U << n))
298 strcpy (result + len, lang_name);
299 len += strlen (lang_name);
307 /* Complain that switch OPT_INDEX does not apply to this front end. */
309 complain_wrong_lang (const char *text, const struct cl_option *option,
310 unsigned int lang_mask)
312 char *ok_langs, *bad_lang;
314 ok_langs = write_langs (option->flags);
315 bad_lang = write_langs (lang_mask);
317 /* Eventually this should become a hard error IMO. */
318 warning ("command line option \"%s\" is valid for %s but not for %s",
319 text, ok_langs, bad_lang);
325 /* Handle the switch beginning at ARGV for the language indicated by
326 LANG_MASK. Returns the number of switches consumed. */
328 handle_option (const char **argv, unsigned int lang_mask)
331 const char *opt, *arg = 0;
334 unsigned int result = 0;
335 const struct cl_option *option;
339 /* Drop the "no-" from negative switches. */
340 if ((opt[1] == 'W' || opt[1] == 'f')
341 && opt[2] == 'n' && opt[3] == 'o' && opt[4] == '-')
343 size_t len = strlen (opt) - 3;
345 dup = xmalloc (len + 1);
348 memcpy (dup + 2, opt + 5, len - 2 + 1);
353 opt_index = find_opt (opt + 1, lang_mask | CL_COMMON);
354 if (opt_index == cl_options_count)
357 option = &cl_options[opt_index];
359 /* Reject negative form of switches that don't take negatives as
361 if (!value && (option->flags & CL_REJECT_NEGATIVE))
364 /* We've recognized this switch. */
367 /* Sort out any argument the switch takes. */
368 if (option->flags & CL_JOINED)
370 /* Have arg point to the original switch. This is because
371 some code, such as disable_builtin_function, expects its
372 argument to be persistent until the program exits. */
373 arg = argv[0] + cl_options[opt_index].opt_len + 1;
375 arg += strlen ("no-");
377 if (*arg == '\0' && !(option->flags & CL_MISSING_OK))
379 if (option->flags & CL_SEPARATE)
385 /* Missing argument. */
389 else if (option->flags & CL_SEPARATE)
395 /* Now we've swallowed any potential argument, complain if this
396 is a switch for a different front end. */
397 if (!(option->flags & (lang_mask | CL_COMMON)))
399 complain_wrong_lang (argv[0], option, lang_mask);
403 if (arg == NULL && (option->flags & (CL_JOINED | CL_SEPARATE)))
405 if (!(*lang_hooks.missing_argument) (opt, opt_index))
406 error ("missing argument to \"%s\"", opt);
410 /* If the switch takes an integer, convert it. */
411 if (arg && (option->flags & CL_UINTEGER))
413 value = integral_argument (arg);
416 error ("argument to \"%s\" should be a non-negative integer",
422 if (option->flags & lang_mask)
423 if ((*lang_hooks.handle_option) (opt_index, arg, value) == 0)
426 if (result && (option->flags & CL_COMMON))
427 if (common_handle_option (opt_index, arg, value) == 0)
436 /* Decode and handle the vector of command line options. LANG_MASK
437 contains has a single bit set representing the current
440 handle_options (unsigned int argc, const char **argv, unsigned int lang_mask)
444 for (i = 1; i < argc; i += n)
446 const char *opt = argv[i];
448 /* Interpret "-" or a non-switch as a file name. */
449 if (opt[0] != '-' || opt[1] == '\0')
451 if (main_input_filename == NULL)
452 main_input_filename = opt;
453 add_input_filename (opt);
458 n = handle_option (argv + i, lang_mask);
463 error ("unrecognized command line option \"%s\"", opt);
468 /* Handle FILENAME from the command line. */
470 add_input_filename (const char *filename)
473 in_fnames = xrealloc (in_fnames, num_in_fnames * sizeof (in_fnames[0]));
474 in_fnames[num_in_fnames - 1] = filename;
477 /* Parse command line options and set default flag values. Do minimal
478 options processing. */
480 decode_options (unsigned int argc, const char **argv)
482 unsigned int i, lang_mask;
484 /* Perform language-specific options initialization. */
485 lang_mask = (*lang_hooks.init_options) (argc, argv);
487 lang_hooks.initialize_diagnostics (global_dc);
489 /* Scan to see what optimization level has been specified. That will
490 determine the default value of many flags. */
491 for (i = 1; i < argc; i++)
493 if (!strcmp (argv[i], "-O"))
498 else if (argv[i][0] == '-' && argv[i][1] == 'O')
500 /* Handle -Os, -O2, -O3, -O69, ... */
501 const char *p = &argv[i][2];
503 if ((p[0] == 's') && (p[1] == 0))
507 /* Optimizing for size forces optimize to be 2. */
512 const int optimize_val = read_integral_parameter (p, p - 2, -1);
513 if (optimize_val != -1)
515 optimize = optimize_val;
524 flag_merge_constants = 0;
530 flag_thread_jumps = 1;
532 flag_delayed_branch = 1;
534 #ifdef CAN_DEBUG_WITHOUT_FP
535 flag_omit_frame_pointer = 1;
537 flag_guess_branch_prob = 1;
538 flag_cprop_registers = 1;
539 flag_loop_optimize = 1;
540 flag_if_conversion = 1;
541 flag_if_conversion2 = 1;
546 flag_crossjumping = 1;
547 flag_optimize_sibling_calls = 1;
548 flag_cse_follow_jumps = 1;
549 flag_cse_skip_blocks = 1;
551 flag_expensive_optimizations = 1;
552 flag_strength_reduce = 1;
553 flag_rerun_cse_after_loop = 1;
554 flag_rerun_loop_opt = 1;
555 flag_caller_saves = 1;
558 #ifdef INSN_SCHEDULING
559 flag_schedule_insns = 1;
560 flag_schedule_insns_after_reload = 1;
563 flag_strict_aliasing = 1;
564 flag_delete_null_pointer_checks = 1;
565 flag_reorder_blocks = 1;
566 flag_reorder_functions = 1;
567 flag_unit_at_a_time = 1;
572 flag_inline_functions = 1;
573 flag_rename_registers = 1;
574 flag_unswitch_loops = 1;
578 if (optimize < 2 || optimize_size)
585 /* Don't reorder blocks when optimizing for size because extra
586 jump insns may be created; also barrier may create extra padding.
588 More correctly we should have a block reordering mode that tried
589 to minimize the combined size of all the jumps. This would more
590 or less automatically remove extra jumps, but would also try to
591 use more short jumps instead of long jumps. */
592 flag_reorder_blocks = 0;
595 /* Initialize whether `char' is signed. */
596 flag_signed_char = DEFAULT_SIGNED_CHAR;
597 #ifdef DEFAULT_SHORT_ENUMS
598 /* Initialize how much space enums occupy, by default. */
599 flag_short_enums = DEFAULT_SHORT_ENUMS;
602 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
605 set_target_switch ("");
607 /* Unwind tables are always present in an ABI-conformant IA-64
608 object file, so the default should be ON. */
609 #ifdef IA64_UNWIND_INFO
610 flag_unwind_tables = IA64_UNWIND_INFO;
613 #ifdef OPTIMIZATION_OPTIONS
614 /* Allow default optimizations to be specified on a per-machine basis. */
615 OPTIMIZATION_OPTIONS (optimize, optimize_size);
618 handle_options (argc, argv, lang_mask);
622 if (flag_pic && !flag_pie)
625 if (flag_no_inline == 2)
628 flag_really_no_inline = flag_no_inline;
630 /* Set flag_no_inline before the post_options () hook. The C front
631 ends use it to determine tree inlining defaults. FIXME: such
632 code should be lang-independent when all front ends use tree
633 inlining, in which case it, and this condition, should be moved
634 to the top of process_options() instead. */
637 /* Inlining does not work if not optimizing,
638 so force it not to be done. */
642 /* The c_decode_option function and decode_option hook set
643 this to `2' if -Wall is used, so we can avoid giving out
644 lots of errors for people who don't realize what -Wall does. */
645 if (warn_uninitialized == 1)
646 warning ("-Wuninitialized is not supported without -O");
649 if (flag_really_no_inline == 2)
650 flag_really_no_inline = flag_no_inline;
653 /* Handle target- and language-independent options. Return zero to
654 generate an "unknown option" message. */
656 common_handle_option (size_t scode, const char *arg,
657 int value ATTRIBUTE_UNUSED)
659 enum opt_code code = (enum opt_code) scode;
668 exit_after_options = true;
675 case OPT__target_help:
676 display_target_options ();
677 exit_after_options = true;
681 print_version (stderr, "");
682 exit_after_options = true;
686 g_switch_value = value;
692 /* Currently handled in a prescan. */
696 /* For backward compatibility, -W is the same as -Wextra. */
700 case OPT_Waggregate_return:
701 warn_aggregate_return = value;
704 case OPT_Wcast_align:
705 warn_cast_align = value;
708 case OPT_Wdeprecated_declarations:
709 warn_deprecated_decl = value;
712 case OPT_Wdisabled_optimization:
713 warn_disabled_optimization = value;
717 warnings_are_errors = value;
728 case OPT_Wlarger_than_:
729 larger_than_size = value;
730 warn_larger_than = value != -1;
733 case OPT_Wmissing_noreturn:
734 warn_missing_noreturn = value;
749 case OPT_Wstrict_aliasing:
750 warn_strict_aliasing = value;
757 case OPT_Wswitch_default:
758 warn_switch_default = value;
761 case OPT_Wswitch_enum:
762 warn_switch_enum = value;
765 case OPT_Wsystem_headers:
766 warn_system_headers = value;
769 case OPT_Wuninitialized:
770 warn_uninitialized = value;
773 case OPT_Wunreachable_code:
774 warn_notreached = value;
781 case OPT_Wunused_function:
782 warn_unused_function = value;
785 case OPT_Wunused_label:
786 warn_unused_label = value;
789 case OPT_Wunused_parameter:
790 warn_unused_parameter = value;
793 case OPT_Wunused_value:
794 warn_unused_value = value;
797 case OPT_Wunused_variable:
798 warn_unused_variable = value;
803 aux_info_file_name = arg;
804 flag_gen_aux_info = 1;
811 case OPT_auxbase_strip:
813 char *tmp = xstrdup (arg);
814 strip_off_ending (tmp, strlen (tmp));
821 decode_d_option (arg);
825 dump_base_name = arg;
829 flag_pic = value + value;
833 flag_pie = value + value;
836 case OPT_fabi_version_:
837 flag_abi_version = value;
840 case OPT_falign_functions:
841 align_functions = !value;
844 case OPT_falign_functions_:
845 align_functions = value;
848 case OPT_falign_jumps:
849 align_jumps = !value;
852 case OPT_falign_jumps_:
856 case OPT_falign_labels:
857 align_labels = !value;
860 case OPT_falign_labels_:
861 align_labels = value;
864 case OPT_falign_loops:
865 align_loops = !value;
868 case OPT_falign_loops_:
872 case OPT_fargument_alias:
873 flag_argument_noalias = !value;
876 case OPT_fargument_noalias:
877 flag_argument_noalias = value;
880 case OPT_fargument_noalias_global:
881 flag_argument_noalias = value + value;
884 case OPT_fasynchronous_unwind_tables:
885 flag_asynchronous_unwind_tables = value;
888 case OPT_fbounds_check:
889 flag_bounds_check = value;
892 case OPT_fbranch_count_reg:
893 flag_branch_on_count_reg = value;
896 case OPT_fbranch_probabilities:
897 flag_branch_probabilities_set = true;
898 flag_branch_probabilities = value;
901 case OPT_fbranch_target_load_optimize:
902 flag_branch_target_load_optimize = value;
905 case OPT_fbranch_target_load_optimize2:
906 flag_branch_target_load_optimize2 = value;
909 case OPT_fcall_used_:
910 fix_register (arg, 0, 1);
913 case OPT_fcall_saved_:
914 fix_register (arg, 0, 0);
917 case OPT_fcaller_saves:
918 flag_caller_saves = value;
922 flag_no_common = !value;
925 case OPT_fcprop_registers:
926 flag_cprop_registers = value;
929 case OPT_fcrossjumping:
930 flag_crossjumping = value;
933 case OPT_fcse_follow_jumps:
934 flag_cse_follow_jumps = value;
937 case OPT_fcse_skip_blocks:
938 flag_cse_skip_blocks = value;
941 case OPT_fdata_sections:
942 flag_data_sections = value;
946 flag_defer_pop = value;
949 case OPT_fdelayed_branch:
950 flag_delayed_branch = value;
953 case OPT_fdelete_null_pointer_checks:
954 flag_delete_null_pointer_checks = value;
957 case OPT_fdiagnostics_show_location_:
958 if (!strcmp (arg, "once"))
959 diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
960 else if (!strcmp (arg, "every-line"))
961 diagnostic_prefixing_rule (global_dc)
962 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE;
967 case OPT_fdump_unnumbered:
968 flag_dump_unnumbered = value;
971 case OPT_feliminate_dwarf2_dups:
972 flag_eliminate_dwarf2_dups = value;
975 case OPT_feliminate_unused_debug_types:
976 flag_eliminate_unused_debug_types = value;
979 case OPT_feliminate_unused_debug_symbols:
980 flag_debug_only_used_symbols = value;
983 case OPT_fexceptions:
984 flag_exceptions = value;
987 case OPT_fexpensive_optimizations:
988 flag_expensive_optimizations = value;
992 set_fast_math_flags (value);
995 case OPT_ffinite_math_only:
996 flag_finite_math_only = value;
1000 fix_register (arg, 1, 1);
1003 case OPT_ffunction_cse:
1004 flag_no_function_cse = !value;
1007 case OPT_ffloat_store:
1008 flag_float_store = value;
1011 case OPT_fforce_addr:
1012 flag_force_addr = value;
1015 case OPT_fforce_mem:
1016 flag_force_mem = value;
1019 case OPT_ffunction_sections:
1020 flag_function_sections = value;
1028 flag_gcse_lm = value;
1032 flag_gcse_sm = value;
1036 flag_gcse_las = value;
1039 case OPT_fguess_branch_probability:
1040 flag_guess_branch_prob = value;
1044 flag_no_ident = !value;
1047 case OPT_fif_conversion:
1048 flag_if_conversion = value;
1051 case OPT_fif_conversion2:
1052 flag_if_conversion2 = value;
1055 case OPT_finhibit_size_directive:
1056 flag_inhibit_size_directive = value;
1060 flag_no_inline = !value;
1063 case OPT_finline_functions:
1064 flag_inline_functions = value;
1067 case OPT_finline_limit_:
1068 case OPT_finline_limit_eq:
1069 set_param_value ("max-inline-insns-single", value / 2);
1070 set_param_value ("max-inline-insns-auto", value / 2);
1071 set_param_value ("max-inline-insns-rtl", value);
1074 case OPT_finstrument_functions:
1075 flag_instrument_function_entry_exit = value;
1078 case OPT_fkeep_inline_functions:
1079 flag_keep_inline_functions =value;
1082 case OPT_fkeep_static_consts:
1083 flag_keep_static_consts = value;
1086 case OPT_fleading_underscore:
1087 flag_leading_underscore = value;
1090 case OPT_floop_optimize:
1091 flag_loop_optimize = value;
1094 case OPT_fmath_errno:
1095 flag_errno_math = value;
1098 case OPT_fmem_report:
1102 case OPT_fmerge_all_constants:
1103 flag_merge_constants = value + value;
1106 case OPT_fmerge_constants:
1107 flag_merge_constants = value;
1110 case OPT_fmessage_length_:
1111 pp_set_line_maximum_length (global_dc->printer, value);
1114 case OPT_fmove_all_movables:
1115 flag_move_all_movables = value;
1119 flag_new_regalloc = value;
1122 case OPT_fnon_call_exceptions:
1123 flag_non_call_exceptions = value;
1126 case OPT_fold_unroll_all_loops:
1127 flag_old_unroll_all_loops = value;
1130 case OPT_fold_unroll_loops:
1131 flag_old_unroll_loops = value;
1134 case OPT_fomit_frame_pointer:
1135 flag_omit_frame_pointer = value;
1138 case OPT_foptimize_register_move:
1139 flag_regmove = value;
1142 case OPT_foptimize_sibling_calls:
1143 flag_optimize_sibling_calls = value;
1146 case OPT_fpack_struct:
1147 flag_pack_struct = value;
1150 case OPT_fpeel_loops:
1151 flag_peel_loops_set = true;
1152 flag_peel_loops = value;
1155 case OPT_fpcc_struct_return:
1156 flag_pcc_struct_return = value;
1160 flag_no_peephole = !value;
1163 case OPT_fpeephole2:
1164 flag_peephole2 = value;
1175 case OPT_fprefetch_loop_arrays:
1176 flag_prefetch_loop_arrays = value;
1180 profile_flag = value;
1183 case OPT_fprofile_arcs:
1184 profile_arc_flag_set = true;
1185 profile_arc_flag = value;
1188 case OPT_fprofile_use:
1189 if (!flag_branch_probabilities_set)
1190 flag_branch_probabilities = value;
1191 if (!flag_profile_values_set)
1192 flag_profile_values = value;
1193 if (!flag_unroll_loops_set)
1194 flag_unroll_loops = value;
1195 if (!flag_peel_loops_set)
1196 flag_peel_loops = value;
1197 if (!flag_tracer_set)
1198 flag_tracer = value;
1199 if (!flag_value_profile_transformations_set)
1200 flag_value_profile_transformations = value;
1203 case OPT_fprofile_generate:
1204 if (!profile_arc_flag_set)
1205 profile_arc_flag = value;
1206 if (!flag_profile_values_set)
1207 flag_profile_values = value;
1208 if (!flag_value_profile_transformations_set)
1209 flag_value_profile_transformations = value;
1212 case OPT_fprofile_values:
1213 flag_profile_values_set = true;
1214 flag_profile_values = value;
1218 flag_value_profile_transformations_set = value;
1219 flag_value_profile_transformations = value;
1222 case OPT_frandom_seed:
1223 /* The real switch is -fno-random-seed. */
1226 flag_random_seed = NULL;
1229 case OPT_frandom_seed_:
1230 flag_random_seed = arg;
1233 case OPT_freduce_all_givs:
1234 flag_reduce_all_givs = value;
1237 case OPT_freg_struct_return:
1238 flag_pcc_struct_return = !value;
1242 flag_regmove = value;
1245 case OPT_frename_registers:
1246 flag_rename_registers = value;
1249 case OPT_freorder_blocks:
1250 flag_reorder_blocks = value;
1253 case OPT_freorder_functions:
1254 flag_reorder_functions = value;
1257 case OPT_frerun_cse_after_loop:
1258 flag_rerun_cse_after_loop = value;
1261 case OPT_frerun_loop_opt:
1262 flag_rerun_loop_opt = value;
1265 case OPT_frounding_math:
1266 flag_rounding_math = value;
1269 case OPT_fsched_interblock:
1270 flag_schedule_interblock = value;
1273 case OPT_fsched_spec:
1274 flag_schedule_speculative = value;
1277 case OPT_fsched_spec_load:
1278 flag_schedule_speculative_load = value;
1281 case OPT_fsched_spec_load_dangerous:
1282 flag_schedule_speculative_load_dangerous = value;
1285 case OPT_fsched_verbose_:
1286 #ifdef INSN_SCHEDULING
1287 fix_sched_param ("verbose", arg);
1293 case OPT_fsched2_use_superblocks:
1294 flag_sched2_use_superblocks = value;
1297 case OPT_fsched2_use_traces:
1298 flag_sched2_use_traces = value;
1301 case OPT_fschedule_insns:
1302 flag_schedule_insns = value;
1305 case OPT_fschedule_insns2:
1306 flag_schedule_insns_after_reload = value;
1309 case OPT_fsched_stalled_insns:
1310 flag_sched_stalled_insns = value;
1313 case OPT_fsched_stalled_insns_:
1314 flag_sched_stalled_insns = value;
1315 if (flag_sched_stalled_insns == 0)
1316 flag_sched_stalled_insns = -1;
1319 case OPT_fsched_stalled_insns_dep:
1320 flag_sched_stalled_insns_dep = 1;
1323 case OPT_fsched_stalled_insns_dep_:
1324 flag_sched_stalled_insns_dep = value;
1327 case OPT_fshared_data:
1328 flag_shared_data = value;
1331 case OPT_fsignaling_nans:
1332 flag_signaling_nans = value;
1335 case OPT_fsingle_precision_constant:
1336 flag_single_precision_constant = value;
1339 case OPT_fstack_check:
1340 flag_stack_check = value;
1343 case OPT_fstack_limit:
1344 /* The real switch is -fno-stack-limit. */
1347 stack_limit_rtx = NULL_RTX;
1350 case OPT_fstack_limit_register_:
1352 int reg = decode_reg_name (arg);
1354 error ("unrecognized register name \"%s\"", arg);
1356 stack_limit_rtx = gen_rtx_REG (Pmode, reg);
1360 case OPT_fstack_limit_symbol_:
1361 stack_limit_rtx = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (arg));
1364 case OPT_fstrength_reduce:
1365 flag_strength_reduce = value;
1368 case OPT_fstrict_aliasing:
1369 flag_strict_aliasing = value;
1372 case OPT_fsyntax_only:
1373 flag_syntax_only = value;
1376 case OPT_ftest_coverage:
1377 flag_test_coverage = value;
1380 case OPT_fthread_jumps:
1381 flag_thread_jumps = value;
1384 case OPT_ftime_report:
1385 time_report = value;
1388 case OPT_ftls_model_:
1389 if (!strcmp (arg, "global-dynamic"))
1390 flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC;
1391 else if (!strcmp (arg, "local-dynamic"))
1392 flag_tls_default = TLS_MODEL_LOCAL_DYNAMIC;
1393 else if (!strcmp (arg, "initial-exec"))
1394 flag_tls_default = TLS_MODEL_INITIAL_EXEC;
1395 else if (!strcmp (arg, "local-exec"))
1396 flag_tls_default = TLS_MODEL_LOCAL_EXEC;
1398 warning ("unknown tls-model \"%s\"", arg);
1402 flag_tracer_set = true;
1403 flag_tracer = value;
1406 case OPT_ftrapping_math:
1407 flag_trapping_math = value;
1414 case OPT_funit_at_a_time:
1415 flag_unit_at_a_time = value;
1418 case OPT_funroll_all_loops:
1419 flag_unroll_all_loops = value;
1422 case OPT_funroll_loops:
1423 flag_unroll_loops_set = true;
1424 flag_unroll_loops = value;
1427 case OPT_funsafe_math_optimizations:
1428 flag_unsafe_math_optimizations = value;
1431 case OPT_funswitch_loops:
1432 flag_unswitch_loops = value;
1435 case OPT_funwind_tables:
1436 flag_unwind_tables = value;
1439 case OPT_fverbose_asm:
1440 flag_verbose_asm = value;
1451 case OPT_fwritable_strings:
1452 flag_writable_strings = value;
1453 if (flag_writable_strings)
1454 inform ("-fwritable-strings is deprecated; "
1455 "see documentation for details");
1458 case OPT_fzero_initialized_in_bss:
1459 flag_zero_initialized_in_bss = value;
1463 set_debug_level (NO_DEBUG, DEFAULT_GDB_EXTENSIONS, arg);
1467 set_debug_level (SDB_DEBUG, false, arg);
1471 set_debug_level (DWARF2_DEBUG, false, arg);
1475 set_debug_level (NO_DEBUG, 2, arg);
1480 set_debug_level (DBX_DEBUG, code == OPT_gstabs_, arg);
1484 set_debug_level (VMS_DEBUG, false, arg);
1489 set_debug_level (XCOFF_DEBUG, code == OPT_gxcoff_, arg);
1493 set_target_switch (arg);
1497 asm_file_name = arg;
1508 case OPT_pedantic_errors:
1509 flag_pedantic_errors = pedantic = 1;
1521 inhibit_warnings = true;
1528 /* Handle --param NAME=VALUE. */
1530 handle_param (const char *carg)
1535 arg = xstrdup (carg);
1536 equal = strchr (arg, '=');
1538 error ("%s: --param arguments should be of the form NAME=VALUE", arg);
1541 value = integral_argument (equal + 1);
1543 error ("invalid --param value `%s'", equal + 1);
1547 set_param_value (arg, value);
1554 /* Handle -W and -Wextra. */
1556 set_Wextra (int setting)
1558 extra_warnings = setting;
1559 warn_unused_value = setting;
1560 warn_unused_parameter = (setting && maybe_warn_unused_parameter);
1562 /* We save the value of warn_uninitialized, since if they put
1563 -Wuninitialized on the command line, we need to generate a
1564 warning about not using it without also specifying -O. */
1566 warn_uninitialized = 0;
1567 else if (warn_uninitialized != 1)
1568 warn_uninitialized = 2;
1571 /* Initialize unused warning flags. */
1573 set_Wunused (int setting)
1575 warn_unused_function = setting;
1576 warn_unused_label = setting;
1577 /* Unused function parameter warnings are reported when either
1578 ``-Wextra -Wunused'' or ``-Wunused-parameter'' is specified.
1579 Thus, if -Wextra has already been seen, set warn_unused_parameter;
1580 otherwise set maybe_warn_extra_parameter, which will be picked up
1582 maybe_warn_unused_parameter = setting;
1583 warn_unused_parameter = (setting && extra_warnings);
1584 warn_unused_variable = setting;
1585 warn_unused_value = setting;
1588 /* The following routines are useful in setting all the flags that
1589 -ffast-math and -fno-fast-math imply. */
1591 set_fast_math_flags (int set)
1593 flag_trapping_math = !set;
1594 flag_unsafe_math_optimizations = set;
1595 flag_finite_math_only = set;
1596 flag_errno_math = !set;
1599 flag_signaling_nans = 0;
1600 flag_rounding_math = 0;
1604 /* Return true iff flags are set as if -ffast-math. */
1606 fast_math_flags_set_p (void)
1608 return (!flag_trapping_math
1609 && flag_unsafe_math_optimizations
1610 && flag_finite_math_only
1611 && !flag_errno_math);
1614 /* Handle a debug output -g switch. EXTENDED is true or false to support
1615 extended output (2 is special and means "-ggdb" was given). */
1617 set_debug_level (enum debug_info_type type, int extended, const char *arg)
1619 static bool type_explicit;
1621 use_gnu_debug_info_extensions = extended;
1623 if (type == NO_DEBUG)
1625 if (write_symbols == NO_DEBUG)
1627 write_symbols = PREFERRED_DEBUGGING_TYPE;
1631 #ifdef DWARF2_DEBUGGING_INFO
1632 write_symbols = DWARF2_DEBUG;
1633 #elif defined DBX_DEBUGGING_INFO
1634 write_symbols = DBX_DEBUG;
1638 if (write_symbols == NO_DEBUG)
1639 warning ("target system does not support debug output");
1644 /* Does it conflict with an already selected type? */
1645 if (type_explicit && write_symbols != NO_DEBUG && type != write_symbols)
1646 error ("debug format \"%s\" conflicts with prior selection",
1647 debug_type_names[type]);
1648 write_symbols = type;
1649 type_explicit = true;
1652 /* A debug flag without a level defaults to level 2. */
1655 if (!debug_info_level)
1656 debug_info_level = 2;
1660 debug_info_level = integral_argument (arg);
1661 if (debug_info_level == (unsigned int) -1)
1662 error ("unrecognised debug output level \"%s\"", arg);
1663 else if (debug_info_level > 3)
1664 error ("debug output level %s is too high", arg);
1668 /* Output --help text. */
1675 GET_ENVIRONMENT (p, "COLUMNS");
1678 int value = atoi (p);
1683 puts (_("The following options are language-independent:\n"));
1685 print_filtered_help (CL_COMMON);
1686 print_param_help ();
1688 for (i = 0; lang_names[i]; i++)
1690 printf (_("The %s front end recognizes the following options:\n\n"),
1692 print_filtered_help (1U << i);
1695 display_target_options ();
1698 /* Print the help for --param. */
1700 print_param_help (void)
1704 puts (_("The --param option recognizes the following as parameters:\n"));
1706 for (i = 0; i < LAST_PARAM; i++)
1708 const char *help = compiler_params[i].help;
1709 const char *param = compiler_params[i].option;
1711 if (help == NULL || *help == '\0')
1712 help = undocumented_msg;
1714 /* Get the translation. */
1717 wrap_help (help, param, strlen (param));
1723 /* Print help for a specific front-end, etc. */
1725 print_filtered_help (unsigned int flag)
1727 unsigned int i, len, filter, indent = 0;
1728 bool duplicates = false;
1729 const char *help, *opt, *tab;
1730 static char *printed;
1732 if (flag == CL_COMMON)
1736 printed = xmalloc (cl_options_count);
1737 memset (printed, 0, cl_options_count);
1741 /* Don't print COMMON options twice. */
1742 filter = flag | CL_COMMON;
1744 for (i = 0; i < cl_options_count; i++)
1746 if ((cl_options[i].flags & filter) != flag)
1749 /* Skip help for internal switches. */
1750 if (cl_options[i].flags & CL_UNDOCUMENTED)
1753 /* Skip switches that have already been printed, mark them to be
1758 indent = print_switch (cl_options[i].opt_text, indent);
1769 for (i = 0; i < cl_options_count; i++)
1771 if ((cl_options[i].flags & filter) != flag)
1774 /* Skip help for internal switches. */
1775 if (cl_options[i].flags & CL_UNDOCUMENTED)
1778 /* Skip switches that have already been printed. */
1784 help = cl_options[i].help;
1786 help = undocumented_msg;
1788 /* Get the translation. */
1791 tab = strchr (help, '\t');
1800 opt = cl_options[i].opt_text;
1804 wrap_help (help, opt, len);
1810 /* Output ITEM, of length ITEM_WIDTH, in the left column, followed by
1811 word-wrapped HELP in a second column. */
1813 print_switch (const char *text, unsigned int indent)
1815 unsigned int len = strlen (text) + 1; /* trailing comma */
1820 if (indent + len > columns)
1831 fputs (text, stdout);
1833 return indent + len + 1;
1836 /* Output ITEM, of length ITEM_WIDTH, in the left column, followed by
1837 word-wrapped HELP in a second column. */
1839 wrap_help (const char *help, const char *item, unsigned int item_width)
1841 unsigned int col_width = 27;
1842 unsigned int remaining, room, len;
1844 remaining = strlen (help);
1848 room = columns - 3 - MAX (col_width, item_width);
1857 for (i = 0; help[i]; i++)
1859 if (i >= room && len != remaining)
1863 else if ((help[i] == '-' || help[i] == '/')
1864 && help[i + 1] != ' '
1865 && i > 0 && ISALPHA (help[i - 1]))
1870 printf( " %-*.*s %.*s\n", col_width, item_width, item, len, help);
1872 while (help[len] == ' ')