1 /* Command line option handling.
2 Copyright (C) 2002, 2003, 2004, 2005, 2006 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, 51 Franklin Street, Fifth Floor, 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 #include "tree-pass.h"
43 /* Value of the -G xx switch, and whether it was passed or not. */
44 unsigned HOST_WIDE_INT g_switch_value;
47 /* True if we should exit after parsing options. */
48 bool exit_after_options;
50 /* Print various extra warnings. -W/-Wextra. */
53 /* True to warn about any objects definitions whose size is larger
54 than N bytes. Also want about function definitions whose returned
55 values are larger than N bytes, where N is `larger_than_size'. */
56 bool warn_larger_than;
57 HOST_WIDE_INT larger_than_size;
59 /* Nonzero means warn about constructs which might not be
60 strict-aliasing safe. */
61 int warn_strict_aliasing;
63 /* Hack for cooperation between set_Wunused and set_Wextra. */
64 static bool maybe_warn_unused_parameter;
66 /* Type(s) of debugging information we are producing (if any). See
67 flags.h for the definitions of the different possible types of
68 debugging information. */
69 enum debug_info_type write_symbols = NO_DEBUG;
71 /* Level of debugging information we are producing. See flags.h for
72 the definitions of the different possible levels. */
73 enum debug_info_level debug_info_level = DINFO_LEVEL_NONE;
75 /* Nonzero means use GNU-only extensions in the generated symbolic
76 debugging information. Currently, this only has an effect when
77 write_symbols is set to DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG. */
78 bool use_gnu_debug_info_extensions;
80 /* The default visibility for all symbols (unless overridden) */
81 enum symbol_visibility default_visibility = VISIBILITY_DEFAULT;
83 /* Disable unit-at-a-time for frontends that might be still broken in this
86 bool no_unit_at_a_time_default;
88 /* Global visibility options. */
89 struct visibility_flags visibility_options;
91 /* Columns of --help display. */
92 static unsigned int columns = 80;
94 /* What to print when a switch has no documentation. */
95 static const char undocumented_msg[] = N_("This switch lacks documentation");
97 /* Used for bookkeeping on whether user set these flags so
98 -fprofile-use/-fprofile-generate does not use them. */
99 static bool profile_arc_flag_set, flag_profile_values_set;
100 static bool flag_unroll_loops_set, flag_tracer_set;
101 static bool flag_value_profile_transformations_set;
102 static bool flag_peel_loops_set, flag_branch_probabilities_set;
104 /* Input file names. */
105 const char **in_fnames;
106 unsigned num_in_fnames;
108 static size_t find_opt (const char *, int);
109 static int common_handle_option (size_t scode, const char *arg, int value,
110 unsigned int lang_mask);
111 static void handle_param (const char *);
112 static void set_Wextra (int);
113 static unsigned int handle_option (const char **argv, unsigned int lang_mask);
114 static char *write_langs (unsigned int lang_mask);
115 static void complain_wrong_lang (const char *, const struct cl_option *,
116 unsigned int lang_mask);
117 static void handle_options (unsigned int, const char **, unsigned int);
118 static void wrap_help (const char *help, const char *item, unsigned int);
119 static void print_target_help (void);
120 static void print_help (void);
121 static void print_param_help (void);
122 static void print_filtered_help (unsigned int);
123 static unsigned int print_switch (const char *text, unsigned int indent);
124 static void set_debug_level (enum debug_info_type type, int extended,
127 /* Perform a binary search to find which option the command-line INPUT
128 matches. Returns its index in the option array, and N_OPTS
129 (cl_options_count) on failure.
131 This routine is quite subtle. A normal binary search is not good
132 enough because some options can be suffixed with an argument, and
133 multiple sub-matches can occur, e.g. input of "-pedantic" matching
134 the initial substring of "-pedantic-errors".
136 A more complicated example is -gstabs. It should match "-g" with
137 an argument of "stabs". Suppose, however, that the number and list
138 of switches are such that the binary search tests "-gen-decls"
139 before having tested "-g". This doesn't match, and as "-gen-decls"
140 is less than "-gstabs", it will become the lower bound of the
141 binary search range, and "-g" will never be seen. To resolve this
142 issue, opts.sh makes "-gen-decls" point, via the back_chain member,
143 to "-g" so that failed searches that end between "-gen-decls" and
144 the lexicographically subsequent switch know to go back and see if
145 "-g" causes a match (which it does in this example).
147 This search is done in such a way that the longest match for the
148 front end in question wins. If there is no match for the current
149 front end, the longest match for a different front end is returned
150 (or N_OPTS if none) and the caller emits an error message. */
152 find_opt (const char *input, int lang_mask)
154 size_t mn, mx, md, opt_len;
155 size_t match_wrong_lang;
159 mx = cl_options_count;
161 /* Find mn such this lexicographical inequality holds:
162 cl_options[mn] <= input < cl_options[mn + 1]. */
166 opt_len = cl_options[md].opt_len;
167 comp = strncmp (input, cl_options[md].opt_text + 1, opt_len);
175 /* This is the switch that is the best match but for a different
176 front end, or cl_options_count if there is no match at all. */
177 match_wrong_lang = cl_options_count;
179 /* Backtrace the chain of possible matches, returning the longest
180 one, if any, that fits best. With current GCC switches, this
181 loop executes at most twice. */
184 const struct cl_option *opt = &cl_options[mn];
186 /* Is the input either an exact match or a prefix that takes a
188 if (!strncmp (input, opt->opt_text + 1, opt->opt_len)
189 && (input[opt->opt_len] == '\0' || (opt->flags & CL_JOINED)))
191 /* If language is OK, return it. */
192 if (opt->flags & lang_mask)
195 /* If we haven't remembered a prior match, remember this
196 one. Any prior match is necessarily better. */
197 if (match_wrong_lang == cl_options_count)
198 match_wrong_lang = mn;
201 /* Try the next possibility. This is cl_options_count if there
203 mn = opt->back_chain;
205 while (mn != cl_options_count);
207 /* Return the best wrong match, or cl_options_count if none. */
208 return match_wrong_lang;
211 /* If ARG is a non-negative integer made up solely of digits, return its
212 value, otherwise return -1. */
214 integral_argument (const char *arg)
218 while (*p && ISDIGIT (*p))
227 /* Return a malloced slash-separated list of languages in MASK. */
229 write_langs (unsigned int mask)
231 unsigned int n = 0, len = 0;
232 const char *lang_name;
235 for (n = 0; (lang_name = lang_names[n]) != 0; n++)
236 if (mask & (1U << n))
237 len += strlen (lang_name) + 1;
239 result = XNEWVEC (char, len);
241 for (n = 0; (lang_name = lang_names[n]) != 0; n++)
242 if (mask & (1U << n))
246 strcpy (result + len, lang_name);
247 len += strlen (lang_name);
255 /* Complain that switch OPT_INDEX does not apply to this front end. */
257 complain_wrong_lang (const char *text, const struct cl_option *option,
258 unsigned int lang_mask)
260 char *ok_langs, *bad_lang;
262 ok_langs = write_langs (option->flags);
263 bad_lang = write_langs (lang_mask);
265 /* Eventually this should become a hard error IMO. */
266 warning (0, "command line option \"%s\" is valid for %s but not for %s",
267 text, ok_langs, bad_lang);
273 /* Handle the switch beginning at ARGV for the language indicated by
274 LANG_MASK. Returns the number of switches consumed. */
276 handle_option (const char **argv, unsigned int lang_mask)
279 const char *opt, *arg = 0;
282 unsigned int result = 0;
283 const struct cl_option *option;
287 opt_index = find_opt (opt + 1, lang_mask | CL_COMMON | CL_TARGET);
288 if (opt_index == cl_options_count
289 && (opt[1] == 'W' || opt[1] == 'f' || opt[1] == 'm')
290 && opt[2] == 'n' && opt[3] == 'o' && opt[4] == '-')
292 /* Drop the "no-" from negative switches. */
293 size_t len = strlen (opt) - 3;
295 dup = XNEWVEC (char, len + 1);
298 memcpy (dup + 2, opt + 5, len - 2 + 1);
301 opt_index = find_opt (opt + 1, lang_mask | CL_COMMON | CL_TARGET);
304 if (opt_index == cl_options_count)
307 option = &cl_options[opt_index];
309 /* Reject negative form of switches that don't take negatives as
311 if (!value && (option->flags & CL_REJECT_NEGATIVE))
314 /* We've recognized this switch. */
317 /* Check to see if the option is disabled for this configuration. */
318 if (option->flags & CL_DISABLED)
320 error ("command line option %qs"
321 " is not supported by this configuration", opt);
325 /* Sort out any argument the switch takes. */
326 if (option->flags & CL_JOINED)
328 /* Have arg point to the original switch. This is because
329 some code, such as disable_builtin_function, expects its
330 argument to be persistent until the program exits. */
331 arg = argv[0] + cl_options[opt_index].opt_len + 1;
333 arg += strlen ("no-");
335 if (*arg == '\0' && !(option->flags & CL_MISSING_OK))
337 if (option->flags & CL_SEPARATE)
343 /* Missing argument. */
347 else if (option->flags & CL_SEPARATE)
353 /* Now we've swallowed any potential argument, complain if this
354 is a switch for a different front end. */
355 if (!(option->flags & (lang_mask | CL_COMMON | CL_TARGET)))
357 complain_wrong_lang (argv[0], option, lang_mask);
361 if (arg == NULL && (option->flags & (CL_JOINED | CL_SEPARATE)))
363 if (!lang_hooks.missing_argument (opt, opt_index))
364 error ("missing argument to \"%s\"", opt);
368 /* If the switch takes an integer, convert it. */
369 if (arg && (option->flags & CL_UINTEGER))
371 value = integral_argument (arg);
374 error ("argument to \"%s\" should be a non-negative integer",
380 if (option->flag_var)
381 switch (option->var_type)
384 *(int *) option->flag_var = value;
388 *(int *) option->flag_var = (value
390 : !option->var_value);
395 if ((value != 0) == (option->var_type == CLVC_BIT_SET))
396 *(int *) option->flag_var |= option->var_value;
398 *(int *) option->flag_var &= ~option->var_value;
399 if (option->flag_var == &target_flags)
400 target_flags_explicit |= option->var_value;
404 *(const char **) option->flag_var = arg;
408 if (option->flags & lang_mask)
409 if (lang_hooks.handle_option (opt_index, arg, value) == 0)
412 if (result && (option->flags & CL_COMMON))
413 if (common_handle_option (opt_index, arg, value, lang_mask) == 0)
416 if (result && (option->flags & CL_TARGET))
417 if (!targetm.handle_option (opt_index, arg, value))
426 /* Handle FILENAME from the command line. */
428 add_input_filename (const char *filename)
431 in_fnames = xrealloc (in_fnames, num_in_fnames * sizeof (in_fnames[0]));
432 in_fnames[num_in_fnames - 1] = filename;
435 /* Decode and handle the vector of command line options. LANG_MASK
436 contains has a single bit set representing the current
439 handle_options (unsigned int argc, const char **argv, unsigned int lang_mask)
443 for (i = 1; i < argc; i += n)
445 const char *opt = argv[i];
447 /* Interpret "-" or a non-switch as a file name. */
448 if (opt[0] != '-' || opt[1] == '\0')
450 if (main_input_filename == NULL)
451 main_input_filename = opt;
452 add_input_filename (opt);
457 n = handle_option (argv + i, lang_mask);
462 error ("unrecognized command line option \"%s\"", opt);
467 /* Parse command line options and set default flag values. Do minimal
468 options processing. */
470 decode_options (unsigned int argc, const char **argv)
472 unsigned int i, lang_mask;
474 /* Perform language-specific options initialization. */
475 lang_mask = lang_hooks.init_options (argc, argv);
477 lang_hooks.initialize_diagnostics (global_dc);
479 /* Scan to see what optimization level has been specified. That will
480 determine the default value of many flags. */
481 for (i = 1; i < argc; i++)
483 if (!strcmp (argv[i], "-O"))
488 else if (argv[i][0] == '-' && argv[i][1] == 'O')
490 /* Handle -Os, -O2, -O3, -O69, ... */
491 const char *p = &argv[i][2];
493 if ((p[0] == 's') && (p[1] == 0))
497 /* Optimizing for size forces optimize to be 2. */
502 const int optimize_val = read_integral_parameter (p, p - 2, -1);
503 if (optimize_val != -1)
505 optimize = optimize_val;
514 flag_merge_constants = 0;
521 flag_delayed_branch = 1;
523 #ifdef CAN_DEBUG_WITHOUT_FP
524 flag_omit_frame_pointer = 1;
526 flag_guess_branch_prob = 1;
527 flag_cprop_registers = 1;
528 flag_if_conversion = 1;
529 flag_if_conversion2 = 1;
530 flag_ipa_pure_const = 1;
531 flag_ipa_reference = 1;
537 flag_tree_live_range_split = 1;
539 flag_tree_copyrename = 1;
541 flag_tree_copy_prop = 1;
543 flag_tree_salias = 1;
544 if (!no_unit_at_a_time_default)
545 flag_unit_at_a_time = 1;
549 /* Loop header copying usually increases size of the code. This used
550 not to be true, since quite often it is possible to verify that
551 the condition is satisfied in the first iteration and therefore
552 to eliminate it. Jump threading handles these cases now. */
559 flag_thread_jumps = 1;
560 flag_crossjumping = 1;
561 flag_optimize_sibling_calls = 1;
562 flag_cse_follow_jumps = 1;
563 flag_cse_skip_blocks = 1;
565 flag_expensive_optimizations = 1;
566 flag_ipa_type_escape = 1;
567 flag_strength_reduce = 1;
568 flag_rerun_cse_after_loop = 1;
569 flag_caller_saves = 1;
571 #ifdef INSN_SCHEDULING
572 flag_schedule_insns = 1;
573 flag_schedule_insns_after_reload = 1;
576 flag_strict_aliasing = 1;
577 flag_delete_null_pointer_checks = 1;
578 flag_reorder_blocks = 1;
579 flag_reorder_functions = 1;
580 flag_tree_store_ccp = 1;
581 flag_tree_store_copy_prop = 1;
586 /* PRE tends to generate bigger code. */
593 flag_inline_functions = 1;
594 flag_unswitch_loops = 1;
595 flag_gcse_after_reload = 1;
598 if (optimize < 2 || optimize_size)
605 /* Don't reorder blocks when optimizing for size because extra
606 jump insns may be created; also barrier may create extra padding.
608 More correctly we should have a block reordering mode that tried
609 to minimize the combined size of all the jumps. This would more
610 or less automatically remove extra jumps, but would also try to
611 use more short jumps instead of long jumps. */
612 flag_reorder_blocks = 0;
613 flag_reorder_blocks_and_partition = 0;
618 /* Inlining of very small functions usually reduces total size. */
619 set_param_value ("max-inline-insns-single", 5);
620 set_param_value ("max-inline-insns-auto", 5);
621 flag_inline_functions = 1;
623 /* We want to crossjump as much as possible. */
624 set_param_value ("min-crossjump-insns", 1);
627 /* Initialize whether `char' is signed. */
628 flag_signed_char = DEFAULT_SIGNED_CHAR;
629 /* Set this to a special "uninitialized" value. The actual default is set
630 after target options have been processed. */
631 flag_short_enums = 2;
633 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
635 target_flags = targetm.default_target_flags;
637 /* Some tagets have ABI-specified unwind tables. */
638 flag_unwind_tables = targetm.unwind_tables_default;
640 #ifdef OPTIMIZATION_OPTIONS
641 /* Allow default optimizations to be specified on a per-machine basis. */
642 OPTIMIZATION_OPTIONS (optimize, optimize_size);
645 handle_options (argc, argv, lang_mask);
649 if (flag_pic && !flag_pie)
652 if (flag_no_inline == 2)
655 flag_really_no_inline = flag_no_inline;
657 /* Set flag_no_inline before the post_options () hook. The C front
658 ends use it to determine tree inlining defaults. FIXME: such
659 code should be lang-independent when all front ends use tree
660 inlining, in which case it, and this condition, should be moved
661 to the top of process_options() instead. */
664 /* Inlining does not work if not optimizing,
665 so force it not to be done. */
669 /* The c_decode_option function and decode_option hook set
670 this to `2' if -Wall is used, so we can avoid giving out
671 lots of errors for people who don't realize what -Wall does. */
672 if (warn_uninitialized == 1)
673 warning (OPT_Wuninitialized,
674 "-Wuninitialized is not supported without -O");
677 if (flag_really_no_inline == 2)
678 flag_really_no_inline = flag_no_inline;
680 /* The optimization to partition hot and cold basic blocks into separate
681 sections of the .o and executable files does not work (currently)
682 with exception handling. This is because there is no support for
683 generating unwind info. If flag_exceptions is turned on we need to
684 turn off the partitioning optimization. */
686 if (flag_exceptions && flag_reorder_blocks_and_partition)
689 ("-freorder-blocks-and-partition does not work with exceptions");
690 flag_reorder_blocks_and_partition = 0;
691 flag_reorder_blocks = 1;
694 /* If user requested unwind info, then turn off the partitioning
697 if (flag_unwind_tables && ! targetm.unwind_tables_default
698 && flag_reorder_blocks_and_partition)
700 inform ("-freorder-blocks-and-partition does not support unwind info");
701 flag_reorder_blocks_and_partition = 0;
702 flag_reorder_blocks = 1;
705 /* If the target requested unwind info, then turn off the partitioning
706 optimization with a different message. Likewise, if the target does not
707 support named sections. */
709 if (flag_reorder_blocks_and_partition
710 && (!targetm.have_named_sections
711 || (flag_unwind_tables && targetm.unwind_tables_default)))
714 ("-freorder-blocks-and-partition does not work on this architecture");
715 flag_reorder_blocks_and_partition = 0;
716 flag_reorder_blocks = 1;
720 /* Handle target- and language-independent options. Return zero to
721 generate an "unknown option" message. Only options that need
722 extra handling need to be listed here; if you simply want
723 VALUE assigned to a variable, it happens automatically. */
726 common_handle_option (size_t scode, const char *arg, int value,
727 unsigned int lang_mask)
729 enum opt_code code = (enum opt_code) scode;
735 exit_after_options = true;
742 case OPT__target_help:
743 print_target_help ();
744 exit_after_options = true;
748 print_version (stderr, "");
749 exit_after_options = true;
753 g_switch_value = value;
759 /* Currently handled in a prescan. */
763 /* For backward compatibility, -W is the same as -Wextra. */
771 new_option = XNEWVEC (char, strlen (arg) + 2);
773 strcpy (new_option+1, arg);
774 option_index = find_opt (new_option, lang_mask);
775 if (option_index == N_OPTS)
777 error ("-Werror-%s: No option -%s", arg, new_option);
781 int kind = value ? DK_ERROR : DK_WARNING;
782 diagnostic_classify_diagnostic (global_dc, option_index, kind);
784 /* -Werror=foo implies -Wfoo. */
785 if (cl_options[option_index].var_type == CLVC_BOOLEAN
786 && cl_options[option_index].flag_var
788 *(int *) cl_options[option_index].flag_var = 1;
798 case OPT_Wlarger_than_:
799 larger_than_size = value;
800 warn_larger_than = value != -1;
803 case OPT_Wstrict_aliasing:
804 case OPT_Wstrict_aliasing_:
805 warn_strict_aliasing = value;
814 aux_info_file_name = arg;
815 flag_gen_aux_info = 1;
822 case OPT_auxbase_strip:
824 char *tmp = xstrdup (arg);
825 strip_off_ending (tmp, strlen (tmp));
832 decode_d_option (arg);
836 dump_base_name = arg;
839 case OPT_falign_functions_:
840 align_functions = value;
843 case OPT_falign_jumps_:
847 case OPT_falign_labels_:
848 align_labels = value;
851 case OPT_falign_loops_:
855 case OPT_fbranch_probabilities:
856 flag_branch_probabilities_set = true;
859 case OPT_fcall_used_:
860 fix_register (arg, 0, 1);
863 case OPT_fcall_saved_:
864 fix_register (arg, 0, 0);
867 case OPT_fdiagnostics_show_location_:
868 if (!strcmp (arg, "once"))
869 diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
870 else if (!strcmp (arg, "every-line"))
871 diagnostic_prefixing_rule (global_dc)
872 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE;
877 case OPT_fdiagnostics_show_option:
878 global_dc->show_option_requested = true;
882 if (!dump_switch_p (arg))
887 set_fast_math_flags (value);
891 fix_register (arg, 1, 1);
894 case OPT_finline_limit_:
895 case OPT_finline_limit_eq:
896 set_param_value ("max-inline-insns-single", value / 2);
897 set_param_value ("max-inline-insns-auto", value / 2);
900 case OPT_fmessage_length_:
901 pp_set_line_maximum_length (global_dc->printer, value);
904 case OPT_fpack_struct_:
905 if (value <= 0 || (value & (value - 1)) || value > 16)
906 error("structure alignment must be a small power of two, not %d", value);
909 initial_max_fld_align = value;
910 maximum_field_alignment = value * BITS_PER_UNIT;
914 case OPT_fpeel_loops:
915 flag_peel_loops_set = true;
918 case OPT_fprofile_arcs:
919 profile_arc_flag_set = true;
922 case OPT_fprofile_use:
923 if (!flag_branch_probabilities_set)
924 flag_branch_probabilities = value;
925 if (!flag_profile_values_set)
926 flag_profile_values = value;
927 if (!flag_unroll_loops_set)
928 flag_unroll_loops = value;
929 if (!flag_peel_loops_set)
930 flag_peel_loops = value;
931 if (!flag_tracer_set)
933 if (!flag_value_profile_transformations_set)
934 flag_value_profile_transformations = value;
937 case OPT_fprofile_generate:
938 if (!profile_arc_flag_set)
939 profile_arc_flag = value;
940 if (!flag_profile_values_set)
941 flag_profile_values = value;
942 if (!flag_value_profile_transformations_set)
943 flag_value_profile_transformations = value;
946 case OPT_fprofile_values:
947 flag_profile_values_set = true;
950 case OPT_fvisibility_:
952 if (!strcmp(arg, "default"))
953 default_visibility = VISIBILITY_DEFAULT;
954 else if (!strcmp(arg, "internal"))
955 default_visibility = VISIBILITY_INTERNAL;
956 else if (!strcmp(arg, "hidden"))
957 default_visibility = VISIBILITY_HIDDEN;
958 else if (!strcmp(arg, "protected"))
959 default_visibility = VISIBILITY_PROTECTED;
961 error ("unrecognized visibility value \"%s\"", arg);
966 flag_value_profile_transformations_set = true;
969 case OPT_frandom_seed:
970 /* The real switch is -fno-random-seed. */
973 flag_random_seed = NULL;
976 case OPT_frandom_seed_:
977 flag_random_seed = arg;
980 case OPT_fsched_verbose_:
981 #ifdef INSN_SCHEDULING
982 fix_sched_param ("verbose", arg);
988 case OPT_fsched_stalled_insns_:
989 flag_sched_stalled_insns = value;
990 if (flag_sched_stalled_insns == 0)
991 flag_sched_stalled_insns = -1;
994 case OPT_fsched_stalled_insns_dep_:
995 flag_sched_stalled_insns_dep = value;
998 case OPT_fstack_limit:
999 /* The real switch is -fno-stack-limit. */
1002 stack_limit_rtx = NULL_RTX;
1005 case OPT_fstack_limit_register_:
1007 int reg = decode_reg_name (arg);
1009 error ("unrecognized register name \"%s\"", arg);
1011 stack_limit_rtx = gen_rtx_REG (Pmode, reg);
1015 case OPT_fstack_limit_symbol_:
1016 stack_limit_rtx = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (arg));
1019 case OPT_ftree_vectorizer_verbose_:
1020 vect_set_verbosity_level (arg);
1023 case OPT_ftls_model_:
1024 if (!strcmp (arg, "global-dynamic"))
1025 flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC;
1026 else if (!strcmp (arg, "local-dynamic"))
1027 flag_tls_default = TLS_MODEL_LOCAL_DYNAMIC;
1028 else if (!strcmp (arg, "initial-exec"))
1029 flag_tls_default = TLS_MODEL_INITIAL_EXEC;
1030 else if (!strcmp (arg, "local-exec"))
1031 flag_tls_default = TLS_MODEL_LOCAL_EXEC;
1033 warning (0, "unknown tls-model \"%s\"", arg);
1037 flag_tracer_set = true;
1040 case OPT_funroll_loops:
1041 flag_unroll_loops_set = true;
1045 set_debug_level (NO_DEBUG, DEFAULT_GDB_EXTENSIONS, arg);
1049 set_debug_level (SDB_DEBUG, false, arg);
1053 set_debug_level (DWARF2_DEBUG, false, arg);
1057 set_debug_level (NO_DEBUG, 2, arg);
1062 set_debug_level (DBX_DEBUG, code == OPT_gstabs_, arg);
1066 set_debug_level (VMS_DEBUG, false, arg);
1071 set_debug_level (XCOFF_DEBUG, code == OPT_gxcoff_, arg);
1075 asm_file_name = arg;
1078 case OPT_pedantic_errors:
1079 flag_pedantic_errors = pedantic = 1;
1082 case OPT_fforce_mem:
1083 warning (0, "-f[no-]force-mem is nop and option will be removed in 4.2");
1087 /* If the flag was handled in a standard way, assume the lack of
1088 processing here is intentional. */
1089 gcc_assert (cl_options[scode].flag_var);
1096 /* Handle --param NAME=VALUE. */
1098 handle_param (const char *carg)
1103 arg = xstrdup (carg);
1104 equal = strchr (arg, '=');
1106 error ("%s: --param arguments should be of the form NAME=VALUE", arg);
1109 value = integral_argument (equal + 1);
1111 error ("invalid --param value %qs", equal + 1);
1115 set_param_value (arg, value);
1122 /* Handle -W and -Wextra. */
1124 set_Wextra (int setting)
1126 extra_warnings = setting;
1127 warn_unused_value = setting;
1128 warn_unused_parameter = (setting && maybe_warn_unused_parameter);
1130 /* We save the value of warn_uninitialized, since if they put
1131 -Wuninitialized on the command line, we need to generate a
1132 warning about not using it without also specifying -O. */
1134 warn_uninitialized = 0;
1135 else if (warn_uninitialized != 1)
1136 warn_uninitialized = 2;
1139 /* Initialize unused warning flags. */
1141 set_Wunused (int setting)
1143 warn_unused_function = setting;
1144 warn_unused_label = setting;
1145 /* Unused function parameter warnings are reported when either
1146 ``-Wextra -Wunused'' or ``-Wunused-parameter'' is specified.
1147 Thus, if -Wextra has already been seen, set warn_unused_parameter;
1148 otherwise set maybe_warn_extra_parameter, which will be picked up
1150 maybe_warn_unused_parameter = setting;
1151 warn_unused_parameter = (setting && extra_warnings);
1152 warn_unused_variable = setting;
1153 warn_unused_value = setting;
1156 /* The following routines are useful in setting all the flags that
1157 -ffast-math and -fno-fast-math imply. */
1159 set_fast_math_flags (int set)
1161 flag_trapping_math = !set;
1162 flag_unsafe_math_optimizations = set;
1163 flag_finite_math_only = set;
1164 flag_errno_math = !set;
1167 flag_signaling_nans = 0;
1168 flag_rounding_math = 0;
1169 flag_cx_limited_range = 1;
1173 /* Return true iff flags are set as if -ffast-math. */
1175 fast_math_flags_set_p (void)
1177 return (!flag_trapping_math
1178 && flag_unsafe_math_optimizations
1179 && flag_finite_math_only
1180 && !flag_errno_math);
1183 /* Handle a debug output -g switch. EXTENDED is true or false to support
1184 extended output (2 is special and means "-ggdb" was given). */
1186 set_debug_level (enum debug_info_type type, int extended, const char *arg)
1188 static bool type_explicit;
1190 use_gnu_debug_info_extensions = extended;
1192 if (type == NO_DEBUG)
1194 if (write_symbols == NO_DEBUG)
1196 write_symbols = PREFERRED_DEBUGGING_TYPE;
1200 #ifdef DWARF2_DEBUGGING_INFO
1201 write_symbols = DWARF2_DEBUG;
1202 #elif defined DBX_DEBUGGING_INFO
1203 write_symbols = DBX_DEBUG;
1207 if (write_symbols == NO_DEBUG)
1208 warning (0, "target system does not support debug output");
1213 /* Does it conflict with an already selected type? */
1214 if (type_explicit && write_symbols != NO_DEBUG && type != write_symbols)
1215 error ("debug format \"%s\" conflicts with prior selection",
1216 debug_type_names[type]);
1217 write_symbols = type;
1218 type_explicit = true;
1221 /* A debug flag without a level defaults to level 2. */
1224 if (!debug_info_level)
1225 debug_info_level = 2;
1229 debug_info_level = integral_argument (arg);
1230 if (debug_info_level == (unsigned int) -1)
1231 error ("unrecognised debug output level \"%s\"", arg);
1232 else if (debug_info_level > 3)
1233 error ("debug output level %s is too high", arg);
1237 /* Display help for target options. */
1239 print_target_help (void)
1242 static bool displayed = false;
1244 /* Avoid double printing for --help --target-help. */
1249 for (i = 0; i < cl_options_count; i++)
1250 if ((cl_options[i].flags & (CL_TARGET | CL_UNDOCUMENTED)) == CL_TARGET)
1252 printf (_("\nTarget specific options:\n"));
1253 print_filtered_help (CL_TARGET);
1258 /* Output --help text. */
1265 GET_ENVIRONMENT (p, "COLUMNS");
1268 int value = atoi (p);
1273 puts (_("The following options are language-independent:\n"));
1275 print_filtered_help (CL_COMMON);
1276 print_param_help ();
1278 for (i = 0; lang_names[i]; i++)
1280 printf (_("The %s front end recognizes the following options:\n\n"),
1282 print_filtered_help (1U << i);
1284 print_target_help ();
1287 /* Print the help for --param. */
1289 print_param_help (void)
1293 puts (_("The --param option recognizes the following as parameters:\n"));
1295 for (i = 0; i < LAST_PARAM; i++)
1297 const char *help = compiler_params[i].help;
1298 const char *param = compiler_params[i].option;
1300 if (help == NULL || *help == '\0')
1301 help = undocumented_msg;
1303 /* Get the translation. */
1306 wrap_help (help, param, strlen (param));
1312 /* Print help for a specific front-end, etc. */
1314 print_filtered_help (unsigned int flag)
1316 unsigned int i, len, filter, indent = 0;
1317 bool duplicates = false;
1318 const char *help, *opt, *tab;
1319 static char *printed;
1321 if (flag == CL_COMMON || flag == CL_TARGET)
1325 printed = xmalloc (cl_options_count);
1326 memset (printed, 0, cl_options_count);
1330 /* Don't print COMMON options twice. */
1331 filter = flag | CL_COMMON;
1333 for (i = 0; i < cl_options_count; i++)
1335 if ((cl_options[i].flags & filter) != flag)
1338 /* Skip help for internal switches. */
1339 if (cl_options[i].flags & CL_UNDOCUMENTED)
1342 /* Skip switches that have already been printed, mark them to be
1347 indent = print_switch (cl_options[i].opt_text, indent);
1358 for (i = 0; i < cl_options_count; i++)
1360 if ((cl_options[i].flags & filter) != flag)
1363 /* Skip help for internal switches. */
1364 if (cl_options[i].flags & CL_UNDOCUMENTED)
1367 /* Skip switches that have already been printed. */
1373 help = cl_options[i].help;
1375 help = undocumented_msg;
1377 /* Get the translation. */
1380 tab = strchr (help, '\t');
1389 opt = cl_options[i].opt_text;
1393 wrap_help (help, opt, len);
1399 /* Output ITEM, of length ITEM_WIDTH, in the left column, followed by
1400 word-wrapped HELP in a second column. */
1402 print_switch (const char *text, unsigned int indent)
1404 unsigned int len = strlen (text) + 1; /* trailing comma */
1409 if (indent + len > columns)
1420 fputs (text, stdout);
1422 return indent + len + 1;
1425 /* Output ITEM, of length ITEM_WIDTH, in the left column, followed by
1426 word-wrapped HELP in a second column. */
1428 wrap_help (const char *help, const char *item, unsigned int item_width)
1430 unsigned int col_width = 27;
1431 unsigned int remaining, room, len;
1433 remaining = strlen (help);
1437 room = columns - 3 - MAX (col_width, item_width);
1446 for (i = 0; help[i]; i++)
1448 if (i >= room && len != remaining)
1452 else if ((help[i] == '-' || help[i] == '/')
1453 && help[i + 1] != ' '
1454 && i > 0 && ISALPHA (help[i - 1]))
1459 printf( " %-*.*s %.*s\n", col_width, item_width, item, len, help);
1461 while (help[len] == ' ')
1469 /* Return 1 if OPTION is enabled, 0 if it is disabled, or -1 if it isn't
1470 a simple on-off switch. */
1473 option_enabled (int opt_idx)
1475 const struct cl_option *option = &(cl_options[opt_idx]);
1476 if (option->flag_var)
1477 switch (option->var_type)
1480 return *(int *) option->flag_var != 0;
1483 return *(int *) option->flag_var == option->var_value;
1485 case CLVC_BIT_CLEAR:
1486 return (*(int *) option->flag_var & option->var_value) == 0;
1489 return (*(int *) option->flag_var & option->var_value) != 0;
1497 /* Fill STATE with the current state of option OPTION. Return true if
1498 there is some state to store. */
1501 get_option_state (int option, struct cl_option_state *state)
1503 if (cl_options[option].flag_var == 0)
1506 switch (cl_options[option].var_type)
1510 state->data = cl_options[option].flag_var;
1511 state->size = sizeof (int);
1514 case CLVC_BIT_CLEAR:
1516 state->ch = option_enabled (option);
1517 state->data = &state->ch;
1522 state->data = *(const char **) cl_options[option].flag_var;
1523 if (state->data == 0)
1525 state->size = strlen (state->data) + 1;