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;
49 /* Print various extra warnings. -W/-Wextra. */
52 /* True to warn about any objects definitions whose size is larger
53 than N bytes. Also want about function definitions whose returned
54 values are larger than N bytes, where N is `larger_than_size'. */
55 bool warn_larger_than;
56 HOST_WIDE_INT larger_than_size;
58 /* Nonzero means warn about constructs which might not be
59 strict-aliasing safe. */
60 int warn_strict_aliasing;
62 /* Hack for cooperation between set_Wunused and set_Wextra. */
63 static bool maybe_warn_unused_parameter;
65 /* Type(s) of debugging information we are producing (if any). See
66 flags.h for the definitions of the different possible types of
67 debugging information. */
68 enum debug_info_type write_symbols = NO_DEBUG;
70 /* Level of debugging information we are producing. See flags.h for
71 the definitions of the different possible levels. */
72 enum debug_info_level debug_info_level = DINFO_LEVEL_NONE;
74 /* Nonzero means use GNU-only extensions in the generated symbolic
75 debugging information. Currently, this only has an effect when
76 write_symbols is set to DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG. */
77 bool use_gnu_debug_info_extensions;
79 /* Columns of --help display. */
80 static unsigned int columns = 80;
82 /* What to print when a switch has no documentation. */
83 static const char undocumented_msg[] = N_("This switch lacks documentation");
85 /* Used for bookkeeping on whether user set these flags so
86 -fprofile-use/-fprofile-generate does not use them. */
87 static bool profile_arc_flag_set, flag_profile_values_set;
88 static bool flag_unroll_loops_set, flag_tracer_set;
89 static bool flag_value_profile_transformations_set;
90 static bool flag_peel_loops_set, flag_branch_probabilities_set;
92 /* Input file names. */
93 const char **in_fnames;
94 unsigned num_in_fnames;
95 unsigned cur_in_fname;
97 static size_t find_opt (const char *, int);
98 static int common_handle_option (size_t scode, const char *arg, int value);
99 static void handle_param (const char *);
100 static void set_Wextra (int);
101 static unsigned int handle_option (const char **argv, unsigned int lang_mask);
102 static char *write_langs (unsigned int lang_mask);
103 static void complain_wrong_lang (const char *, const struct cl_option *,
104 unsigned int lang_mask);
105 static void handle_options (unsigned int, const char **, unsigned int);
106 static void wrap_help (const char *help, const char *item, unsigned int);
107 static void print_help (void);
108 static void print_param_help (void);
109 static void print_filtered_help (unsigned int flag);
110 static unsigned int print_switch (const char *text, unsigned int indent);
111 static void set_debug_level (enum debug_info_type type, int extended,
114 /* Perform a binary search to find which option the command-line INPUT
115 matches. Returns its index in the option array, and N_OPTS
116 (cl_options_count) on failure.
118 This routine is quite subtle. A normal binary search is not good
119 enough because some options can be suffixed with an argument, and
120 multiple sub-matches can occur, e.g. input of "-pedantic" matching
121 the initial substring of "-pedantic-errors".
123 A more complicated example is -gstabs. It should match "-g" with
124 an argument of "stabs". Suppose, however, that the number and list
125 of switches are such that the binary search tests "-gen-decls"
126 before having tested "-g". This doesn't match, and as "-gen-decls"
127 is less than "-gstabs", it will become the lower bound of the
128 binary search range, and "-g" will never be seen. To resolve this
129 issue, opts.sh makes "-gen-decls" point, via the back_chain member,
130 to "-g" so that failed searches that end between "-gen-decls" and
131 the lexicographically subsequent switch know to go back and see if
132 "-g" causes a match (which it does in this example).
134 This search is done in such a way that the longest match for the
135 front end in question wins. If there is no match for the current
136 front end, the longest match for a different front end is returned
137 (or N_OPTS if none) and the caller emits an error message. */
139 find_opt (const char *input, int lang_mask)
141 size_t mn, mx, md, opt_len;
142 size_t match_wrong_lang;
146 mx = cl_options_count;
148 /* Find mn such this lexicographical inequality holds:
149 cl_options[mn] <= input < cl_options[mn + 1]. */
153 opt_len = cl_options[md].opt_len;
154 comp = strncmp (input, cl_options[md].opt_text + 1, opt_len);
162 /* This is the switch that is the best match but for a different
163 front end, or cl_options_count if there is no match at all. */
164 match_wrong_lang = cl_options_count;
166 /* Backtrace the chain of possible matches, returning the longest
167 one, if any, that fits best. With current GCC switches, this
168 loop executes at most twice. */
171 const struct cl_option *opt = &cl_options[mn];
173 /* Is this switch a prefix of the input? */
174 if (!strncmp (input, opt->opt_text + 1, opt->opt_len))
176 /* If language is OK, and the match is exact or the switch
177 takes a joined argument, return it. */
178 if ((opt->flags & lang_mask)
179 && (input[opt->opt_len] == '\0' || (opt->flags & CL_JOINED)))
182 /* If we haven't remembered a prior match, remember this
183 one. Any prior match is necessarily better. */
184 if (match_wrong_lang == cl_options_count)
185 match_wrong_lang = mn;
188 /* Try the next possibility. This is cl_options_count if there
190 mn = opt->back_chain;
192 while (mn != cl_options_count);
194 /* Return the best wrong match, or cl_options_count if none. */
195 return match_wrong_lang;
198 /* If ARG is a non-negative integer made up solely of digits, return its
199 value, otherwise return -1. */
201 integral_argument (const char *arg)
205 while (*p && ISDIGIT (*p))
214 /* Return a malloced slash-separated list of languages in MASK. */
216 write_langs (unsigned int mask)
218 unsigned int n = 0, len = 0;
219 const char *lang_name;
222 for (n = 0; (lang_name = lang_names[n]) != 0; n++)
223 if (mask & (1U << n))
224 len += strlen (lang_name) + 1;
226 result = xmalloc (len);
228 for (n = 0; (lang_name = lang_names[n]) != 0; n++)
229 if (mask & (1U << n))
233 strcpy (result + len, lang_name);
234 len += strlen (lang_name);
242 /* Complain that switch OPT_INDEX does not apply to this front end. */
244 complain_wrong_lang (const char *text, const struct cl_option *option,
245 unsigned int lang_mask)
247 char *ok_langs, *bad_lang;
249 ok_langs = write_langs (option->flags);
250 bad_lang = write_langs (lang_mask);
252 /* Eventually this should become a hard error IMO. */
253 warning ("command line option \"%s\" is valid for %s but not for %s",
254 text, ok_langs, bad_lang);
260 /* Handle the switch beginning at ARGV for the language indicated by
261 LANG_MASK. Returns the number of switches consumed. */
263 handle_option (const char **argv, unsigned int lang_mask)
266 const char *opt, *arg = 0;
269 unsigned int result = 0;
270 const struct cl_option *option;
274 /* Drop the "no-" from negative switches. */
275 if ((opt[1] == 'W' || opt[1] == 'f')
276 && opt[2] == 'n' && opt[3] == 'o' && opt[4] == '-')
278 size_t len = strlen (opt) - 3;
280 dup = xmalloc (len + 1);
283 memcpy (dup + 2, opt + 5, len - 2 + 1);
288 opt_index = find_opt (opt + 1, lang_mask | CL_COMMON);
289 if (opt_index == cl_options_count)
292 option = &cl_options[opt_index];
294 /* Reject negative form of switches that don't take negatives as
296 if (!value && (option->flags & CL_REJECT_NEGATIVE))
299 /* We've recognized this switch. */
302 /* Sort out any argument the switch takes. */
303 if (option->flags & CL_JOINED)
305 /* Have arg point to the original switch. This is because
306 some code, such as disable_builtin_function, expects its
307 argument to be persistent until the program exits. */
308 arg = argv[0] + cl_options[opt_index].opt_len + 1;
310 arg += strlen ("no-");
312 if (*arg == '\0' && !(option->flags & CL_MISSING_OK))
314 if (option->flags & CL_SEPARATE)
320 /* Missing argument. */
324 else if (option->flags & CL_SEPARATE)
330 /* Now we've swallowed any potential argument, complain if this
331 is a switch for a different front end. */
332 if (!(option->flags & (lang_mask | CL_COMMON)))
334 complain_wrong_lang (argv[0], option, lang_mask);
338 if (arg == NULL && (option->flags & (CL_JOINED | CL_SEPARATE)))
340 if (!lang_hooks.missing_argument (opt, opt_index))
341 error ("missing argument to \"%s\"", opt);
345 /* If the switch takes an integer, convert it. */
346 if (arg && (option->flags & CL_UINTEGER))
348 value = integral_argument (arg);
351 error ("argument to \"%s\" should be a non-negative integer",
357 if (option->flag_var)
359 if (option->has_set_value)
362 *option->flag_var = option->set_value;
364 *option->flag_var = !option->set_value;
367 *option->flag_var = value;
370 if (option->flags & lang_mask)
371 if (lang_hooks.handle_option (opt_index, arg, value) == 0)
374 if (result && (option->flags & CL_COMMON))
375 if (common_handle_option (opt_index, arg, value) == 0)
384 /* Decode and handle the vector of command line options. LANG_MASK
385 contains has a single bit set representing the current
388 handle_options (unsigned int argc, const char **argv, unsigned int lang_mask)
392 for (i = 1; i < argc; i += n)
394 const char *opt = argv[i];
396 /* Interpret "-" or a non-switch as a file name. */
397 if (opt[0] != '-' || opt[1] == '\0')
399 if (main_input_filename == NULL)
400 main_input_filename = opt;
401 add_input_filename (opt);
406 n = handle_option (argv + i, lang_mask);
411 error ("unrecognized command line option \"%s\"", opt);
416 /* Handle FILENAME from the command line. */
418 add_input_filename (const char *filename)
421 in_fnames = xrealloc (in_fnames, num_in_fnames * sizeof (in_fnames[0]));
422 in_fnames[num_in_fnames - 1] = filename;
425 /* Parse command line options and set default flag values. Do minimal
426 options processing. */
428 decode_options (unsigned int argc, const char **argv)
430 unsigned int i, lang_mask;
432 /* Perform language-specific options initialization. */
433 lang_mask = lang_hooks.init_options (argc, argv);
435 lang_hooks.initialize_diagnostics (global_dc);
437 /* Scan to see what optimization level has been specified. That will
438 determine the default value of many flags. */
439 for (i = 1; i < argc; i++)
441 if (!strcmp (argv[i], "-O"))
446 else if (argv[i][0] == '-' && argv[i][1] == 'O')
448 /* Handle -Os, -O2, -O3, -O69, ... */
449 const char *p = &argv[i][2];
451 if ((p[0] == 's') && (p[1] == 0))
455 /* Optimizing for size forces optimize to be 2. */
460 const int optimize_val = read_integral_parameter (p, p - 2, -1);
461 if (optimize_val != -1)
463 optimize = optimize_val;
472 flag_merge_constants = 0;
478 flag_thread_jumps = 1;
480 flag_delayed_branch = 1;
482 #ifdef CAN_DEBUG_WITHOUT_FP
483 flag_omit_frame_pointer = 1;
485 flag_guess_branch_prob = 1;
486 flag_cprop_registers = 1;
487 flag_loop_optimize = 1;
488 flag_if_conversion = 1;
489 flag_if_conversion2 = 1;
496 flag_tree_live_range_split = 1;
498 flag_tree_copyrename = 1;
503 /* Loop header copying usually increases size of the code. This used
504 not to be true, since quite often it is possible to verify that
505 the condition is satisfied in the first iteration and therefore
506 to eliminate it. Jump threading handles these cases now. */
513 flag_crossjumping = 1;
514 flag_optimize_sibling_calls = 1;
515 flag_cse_follow_jumps = 1;
516 flag_cse_skip_blocks = 1;
518 flag_expensive_optimizations = 1;
519 flag_strength_reduce = 1;
520 flag_rerun_cse_after_loop = 1;
521 flag_rerun_loop_opt = 1;
522 flag_caller_saves = 1;
525 #ifdef INSN_SCHEDULING
526 flag_schedule_insns = 1;
527 flag_schedule_insns_after_reload = 1;
530 flag_strict_aliasing = 1;
531 flag_delete_null_pointer_checks = 1;
532 flag_reorder_blocks = 1;
533 flag_reorder_functions = 1;
534 flag_unit_at_a_time = 1;
539 flag_inline_functions = 1;
540 flag_unswitch_loops = 1;
541 flag_gcse_after_reload = 1;
544 if (optimize < 2 || optimize_size)
551 /* Don't reorder blocks when optimizing for size because extra
552 jump insns may be created; also barrier may create extra padding.
554 More correctly we should have a block reordering mode that tried
555 to minimize the combined size of all the jumps. This would more
556 or less automatically remove extra jumps, but would also try to
557 use more short jumps instead of long jumps. */
558 flag_reorder_blocks = 0;
559 flag_reorder_blocks_and_partition = 0;
564 /* Inlining of very small functions usually reduces total size. */
565 set_param_value ("max-inline-insns-single", 5);
566 set_param_value ("max-inline-insns-auto", 5);
567 set_param_value ("max-inline-insns-rtl", 10);
568 flag_inline_functions = 1;
571 /* Initialize whether `char' is signed. */
572 flag_signed_char = DEFAULT_SIGNED_CHAR;
573 /* Set this to a special "uninitialized" value. The actual default is set
574 after target options have been processed. */
575 flag_short_enums = 2;
577 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
580 set_target_switch ("");
582 /* Unwind tables are always present in an ABI-conformant IA-64
583 object file, so the default should be ON. */
584 #ifdef IA64_UNWIND_INFO
585 flag_unwind_tables = IA64_UNWIND_INFO;
588 #ifdef OPTIMIZATION_OPTIONS
589 /* Allow default optimizations to be specified on a per-machine basis. */
590 OPTIMIZATION_OPTIONS (optimize, optimize_size);
593 handle_options (argc, argv, lang_mask);
597 if (flag_pic && !flag_pie)
600 if (flag_no_inline == 2)
603 flag_really_no_inline = flag_no_inline;
605 /* Set flag_no_inline before the post_options () hook. The C front
606 ends use it to determine tree inlining defaults. FIXME: such
607 code should be lang-independent when all front ends use tree
608 inlining, in which case it, and this condition, should be moved
609 to the top of process_options() instead. */
612 /* Inlining does not work if not optimizing,
613 so force it not to be done. */
617 /* The c_decode_option function and decode_option hook set
618 this to `2' if -Wall is used, so we can avoid giving out
619 lots of errors for people who don't realize what -Wall does. */
620 if (warn_uninitialized == 1)
621 warning ("-Wuninitialized is not supported without -O");
624 if (flag_really_no_inline == 2)
625 flag_really_no_inline = flag_no_inline;
627 /* The optimization to partition hot and cold basic blocks into separate
628 sections of the .o and executable files does not work (currently)
629 with exception handling. If flag_exceptions is turned on we need to
630 turn off the partitioning optimization. */
632 if (flag_exceptions && flag_reorder_blocks_and_partition)
635 ("-freorder-blocks-and-partition does not work with exceptions");
636 flag_reorder_blocks_and_partition = 0;
637 flag_reorder_blocks = 1;
641 /* Handle target- and language-independent options. Return zero to
642 generate an "unknown option" message. Only options that need
643 extra handling need to be listed here; if you simply want
644 VALUE assigned to a variable, it happens automatically. */
647 common_handle_option (size_t scode, const char *arg, int value)
649 enum opt_code code = (enum opt_code) scode;
655 exit_after_options = true;
662 case OPT__target_help:
663 display_target_options ();
664 exit_after_options = true;
668 print_version (stderr, "");
669 exit_after_options = true;
673 g_switch_value = value;
679 /* Currently handled in a prescan. */
683 /* For backward compatibility, -W is the same as -Wextra. */
691 case OPT_Wlarger_than_:
692 larger_than_size = value;
693 warn_larger_than = value != -1;
696 case OPT_Wstrict_aliasing:
697 case OPT_Wstrict_aliasing_:
698 warn_strict_aliasing = value;
707 aux_info_file_name = arg;
708 flag_gen_aux_info = 1;
715 case OPT_auxbase_strip:
717 char *tmp = xstrdup (arg);
718 strip_off_ending (tmp, strlen (tmp));
725 decode_d_option (arg);
729 dump_base_name = arg;
732 case OPT_falign_functions_:
733 align_functions = value;
736 case OPT_falign_jumps_:
740 case OPT_falign_labels_:
741 align_labels = value;
744 case OPT_falign_loops_:
748 case OPT_fbranch_probabilities:
749 flag_branch_probabilities_set = true;
752 case OPT_fcall_used_:
753 fix_register (arg, 0, 1);
756 case OPT_fcall_saved_:
757 fix_register (arg, 0, 0);
760 case OPT_fdiagnostics_show_location_:
761 if (!strcmp (arg, "once"))
762 diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
763 else if (!strcmp (arg, "every-line"))
764 diagnostic_prefixing_rule (global_dc)
765 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE;
771 if (!dump_switch_p (arg))
776 set_fast_math_flags (value);
780 fix_register (arg, 1, 1);
783 case OPT_finline_limit_:
784 case OPT_finline_limit_eq:
785 set_param_value ("max-inline-insns-single", value / 2);
786 set_param_value ("max-inline-insns-auto", value / 2);
787 set_param_value ("max-inline-insns-rtl", value);
790 case OPT_fmessage_length_:
791 pp_set_line_maximum_length (global_dc->printer, value);
794 case OPT_fpeel_loops:
795 flag_peel_loops_set = true;
798 case OPT_fprofile_arcs:
799 profile_arc_flag_set = true;
802 case OPT_fprofile_use:
803 if (!flag_branch_probabilities_set)
804 flag_branch_probabilities = value;
805 if (!flag_profile_values_set)
806 flag_profile_values = value;
807 if (!flag_unroll_loops_set)
808 flag_unroll_loops = value;
809 if (!flag_peel_loops_set)
810 flag_peel_loops = value;
811 if (!flag_tracer_set)
813 if (!flag_value_profile_transformations_set)
814 flag_value_profile_transformations = value;
817 case OPT_fprofile_generate:
818 if (!profile_arc_flag_set)
819 profile_arc_flag = value;
820 if (!flag_profile_values_set)
821 flag_profile_values = value;
822 if (!flag_value_profile_transformations_set)
823 flag_value_profile_transformations = value;
826 case OPT_fprofile_values:
827 flag_profile_values_set = true;
831 flag_value_profile_transformations_set = value;
834 case OPT_frandom_seed:
835 /* The real switch is -fno-random-seed. */
838 flag_random_seed = NULL;
841 case OPT_frandom_seed_:
842 flag_random_seed = arg;
845 case OPT_fsched_verbose_:
846 #ifdef INSN_SCHEDULING
847 fix_sched_param ("verbose", arg);
853 case OPT_fsched_stalled_insns_:
854 flag_sched_stalled_insns = value;
855 if (flag_sched_stalled_insns == 0)
856 flag_sched_stalled_insns = -1;
859 case OPT_fsched_stalled_insns_dep_:
860 flag_sched_stalled_insns_dep = value;
863 case OPT_fstack_limit:
864 /* The real switch is -fno-stack-limit. */
867 stack_limit_rtx = NULL_RTX;
870 case OPT_fstack_limit_register_:
872 int reg = decode_reg_name (arg);
874 error ("unrecognized register name \"%s\"", arg);
876 stack_limit_rtx = gen_rtx_REG (Pmode, reg);
880 case OPT_fstack_limit_symbol_:
881 stack_limit_rtx = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (arg));
884 case OPT_ftls_model_:
885 if (!strcmp (arg, "global-dynamic"))
886 flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC;
887 else if (!strcmp (arg, "local-dynamic"))
888 flag_tls_default = TLS_MODEL_LOCAL_DYNAMIC;
889 else if (!strcmp (arg, "initial-exec"))
890 flag_tls_default = TLS_MODEL_INITIAL_EXEC;
891 else if (!strcmp (arg, "local-exec"))
892 flag_tls_default = TLS_MODEL_LOCAL_EXEC;
894 warning ("unknown tls-model \"%s\"", arg);
898 flag_tracer_set = true;
901 case OPT_ftree_points_to_:
902 if (!strcmp (arg, "andersen"))
904 flag_tree_points_to = PTA_ANDERSEN;
906 warning ("Andersen's PTA not available - libbanshee not compiled.");
908 else if (!strcmp (arg, "none"))
909 flag_tree_points_to = PTA_NONE;
912 warning ("`%s`: unknown points-to analysis algorithm", arg);
917 case OPT_funroll_loops:
918 flag_unroll_loops_set = true;
922 set_debug_level (NO_DEBUG, DEFAULT_GDB_EXTENSIONS, arg);
926 set_debug_level (SDB_DEBUG, false, arg);
930 set_debug_level (DWARF2_DEBUG, false, arg);
934 set_debug_level (NO_DEBUG, 2, arg);
939 set_debug_level (DBX_DEBUG, code == OPT_gstabs_, arg);
943 set_debug_level (VMS_DEBUG, false, arg);
948 set_debug_level (XCOFF_DEBUG, code == OPT_gxcoff_, arg);
952 set_target_switch (arg);
959 case OPT_pedantic_errors:
960 flag_pedantic_errors = pedantic = 1;
964 /* If the flag was handled in a standard way, assume the lack of
965 processing here is intentional. */
966 if (cl_options[scode].flag_var)
975 /* Handle --param NAME=VALUE. */
977 handle_param (const char *carg)
982 arg = xstrdup (carg);
983 equal = strchr (arg, '=');
985 error ("%s: --param arguments should be of the form NAME=VALUE", arg);
988 value = integral_argument (equal + 1);
990 error ("invalid --param value `%s'", equal + 1);
994 set_param_value (arg, value);
1001 /* Handle -W and -Wextra. */
1003 set_Wextra (int setting)
1005 extra_warnings = setting;
1006 warn_unused_value = setting;
1007 warn_unused_parameter = (setting && maybe_warn_unused_parameter);
1009 /* We save the value of warn_uninitialized, since if they put
1010 -Wuninitialized on the command line, we need to generate a
1011 warning about not using it without also specifying -O. */
1013 warn_uninitialized = 0;
1014 else if (warn_uninitialized != 1)
1015 warn_uninitialized = 2;
1018 /* Initialize unused warning flags. */
1020 set_Wunused (int setting)
1022 warn_unused_function = setting;
1023 warn_unused_label = setting;
1024 /* Unused function parameter warnings are reported when either
1025 ``-Wextra -Wunused'' or ``-Wunused-parameter'' is specified.
1026 Thus, if -Wextra has already been seen, set warn_unused_parameter;
1027 otherwise set maybe_warn_extra_parameter, which will be picked up
1029 maybe_warn_unused_parameter = setting;
1030 warn_unused_parameter = (setting && extra_warnings);
1031 warn_unused_variable = setting;
1032 warn_unused_value = setting;
1035 /* The following routines are useful in setting all the flags that
1036 -ffast-math and -fno-fast-math imply. */
1038 set_fast_math_flags (int set)
1040 flag_trapping_math = !set;
1041 flag_unsafe_math_optimizations = set;
1042 flag_finite_math_only = set;
1043 flag_errno_math = !set;
1046 flag_signaling_nans = 0;
1047 flag_rounding_math = 0;
1051 /* Return true iff flags are set as if -ffast-math. */
1053 fast_math_flags_set_p (void)
1055 return (!flag_trapping_math
1056 && flag_unsafe_math_optimizations
1057 && flag_finite_math_only
1058 && !flag_errno_math);
1061 /* Handle a debug output -g switch. EXTENDED is true or false to support
1062 extended output (2 is special and means "-ggdb" was given). */
1064 set_debug_level (enum debug_info_type type, int extended, const char *arg)
1066 static bool type_explicit;
1068 use_gnu_debug_info_extensions = extended;
1070 if (type == NO_DEBUG)
1072 if (write_symbols == NO_DEBUG)
1074 write_symbols = PREFERRED_DEBUGGING_TYPE;
1078 #ifdef DWARF2_DEBUGGING_INFO
1079 write_symbols = DWARF2_DEBUG;
1080 #elif defined DBX_DEBUGGING_INFO
1081 write_symbols = DBX_DEBUG;
1085 if (write_symbols == NO_DEBUG)
1086 warning ("target system does not support debug output");
1091 /* Does it conflict with an already selected type? */
1092 if (type_explicit && write_symbols != NO_DEBUG && type != write_symbols)
1093 error ("debug format \"%s\" conflicts with prior selection",
1094 debug_type_names[type]);
1095 write_symbols = type;
1096 type_explicit = true;
1099 /* A debug flag without a level defaults to level 2. */
1102 if (!debug_info_level)
1103 debug_info_level = 2;
1107 debug_info_level = integral_argument (arg);
1108 if (debug_info_level == (unsigned int) -1)
1109 error ("unrecognised debug output level \"%s\"", arg);
1110 else if (debug_info_level > 3)
1111 error ("debug output level %s is too high", arg);
1115 /* Output --help text. */
1122 GET_ENVIRONMENT (p, "COLUMNS");
1125 int value = atoi (p);
1130 puts (_("The following options are language-independent:\n"));
1132 print_filtered_help (CL_COMMON);
1133 print_param_help ();
1135 for (i = 0; lang_names[i]; i++)
1137 printf (_("The %s front end recognizes the following options:\n\n"),
1139 print_filtered_help (1U << i);
1142 display_target_options ();
1145 /* Print the help for --param. */
1147 print_param_help (void)
1151 puts (_("The --param option recognizes the following as parameters:\n"));
1153 for (i = 0; i < LAST_PARAM; i++)
1155 const char *help = compiler_params[i].help;
1156 const char *param = compiler_params[i].option;
1158 if (help == NULL || *help == '\0')
1159 help = undocumented_msg;
1161 /* Get the translation. */
1164 wrap_help (help, param, strlen (param));
1170 /* Print help for a specific front-end, etc. */
1172 print_filtered_help (unsigned int flag)
1174 unsigned int i, len, filter, indent = 0;
1175 bool duplicates = false;
1176 const char *help, *opt, *tab;
1177 static char *printed;
1179 if (flag == CL_COMMON)
1183 printed = xmalloc (cl_options_count);
1184 memset (printed, 0, cl_options_count);
1188 /* Don't print COMMON options twice. */
1189 filter = flag | CL_COMMON;
1191 for (i = 0; i < cl_options_count; i++)
1193 if ((cl_options[i].flags & filter) != flag)
1196 /* Skip help for internal switches. */
1197 if (cl_options[i].flags & CL_UNDOCUMENTED)
1200 /* Skip switches that have already been printed, mark them to be
1205 indent = print_switch (cl_options[i].opt_text, indent);
1216 for (i = 0; i < cl_options_count; i++)
1218 if ((cl_options[i].flags & filter) != flag)
1221 /* Skip help for internal switches. */
1222 if (cl_options[i].flags & CL_UNDOCUMENTED)
1225 /* Skip switches that have already been printed. */
1231 help = cl_options[i].help;
1233 help = undocumented_msg;
1235 /* Get the translation. */
1238 tab = strchr (help, '\t');
1247 opt = cl_options[i].opt_text;
1251 wrap_help (help, opt, len);
1257 /* Output ITEM, of length ITEM_WIDTH, in the left column, followed by
1258 word-wrapped HELP in a second column. */
1260 print_switch (const char *text, unsigned int indent)
1262 unsigned int len = strlen (text) + 1; /* trailing comma */
1267 if (indent + len > columns)
1278 fputs (text, stdout);
1280 return indent + len + 1;
1283 /* Output ITEM, of length ITEM_WIDTH, in the left column, followed by
1284 word-wrapped HELP in a second column. */
1286 wrap_help (const char *help, const char *item, unsigned int item_width)
1288 unsigned int col_width = 27;
1289 unsigned int remaining, room, len;
1291 remaining = strlen (help);
1295 room = columns - 3 - MAX (col_width, item_width);
1304 for (i = 0; help[i]; i++)
1306 if (i >= room && len != remaining)
1310 else if ((help[i] == '-' || help[i] == '/')
1311 && help[i + 1] != ' '
1312 && i > 0 && ISALPHA (help[i - 1]))
1317 printf( " %-*.*s %.*s\n", col_width, item_width, item, len, help);
1319 while (help[len] == ' ')