1 /* Command line option handling.
2 Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007
3 Free Software Foundation, Inc.
4 Contributed by Neil Booth.
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 3, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
25 #include "coretypes.h"
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"
45 /* Value of the -G xx switch, and whether it was passed or not. */
46 unsigned HOST_WIDE_INT g_switch_value
;
49 /* True if we should exit after parsing options. */
50 bool exit_after_options
;
52 /* Print various extra warnings. -W/-Wextra. */
55 /* True to warn about any objects definitions whose size is larger
56 than N bytes. Also want about function definitions whose returned
57 values are larger than N bytes, where N is `larger_than_size'. */
58 bool warn_larger_than
;
59 HOST_WIDE_INT larger_than_size
;
61 /* Nonzero means warn about constructs which might not be
62 strict-aliasing safe. */
63 int warn_strict_aliasing
;
65 /* Nonzero means warn about optimizations which rely on undefined
67 int warn_strict_overflow
;
69 /* Hack for cooperation between set_Wunused and set_Wextra. */
70 static bool maybe_warn_unused_parameter
;
72 /* Type(s) of debugging information we are producing (if any). See
73 flags.h for the definitions of the different possible types of
74 debugging information. */
75 enum debug_info_type write_symbols
= NO_DEBUG
;
77 /* Level of debugging information we are producing. See flags.h for
78 the definitions of the different possible levels. */
79 enum debug_info_level debug_info_level
= DINFO_LEVEL_NONE
;
81 /* A major contribution to object and executable size is debug
82 information size. A major contribution to debug information size
83 is struct descriptions replicated in several object files. The
84 following flags attempt to reduce this information. The basic
85 idea is to not emit struct debugging information in the current
86 compilation unit when that information will be generated by
87 another compilation unit.
89 Debug information for a struct defined in the current source
90 file should be generated in the object file. Likewise the
91 debug information for a struct defined in a header should be
92 generated in the object file of the corresponding source file.
93 Both of these case are handled when the base name of the file of
94 the struct definition matches the base name of the source file
95 of the current compilation unit. This matching emits minimal
96 struct debugging information.
98 The base file name matching rule above will fail to emit debug
99 information for structs defined in system headers. So a second
100 category of files includes system headers in addition to files
103 The remaining types of files are library headers and application
104 headers. We cannot currently distinguish these two types. */
106 enum debug_struct_file
108 DINFO_STRUCT_FILE_NONE
, /* Debug no structs. */
109 DINFO_STRUCT_FILE_BASE
, /* Debug structs defined in files with the
110 same base name as the compilation unit. */
111 DINFO_STRUCT_FILE_SYS
, /* Also debug structs defined in system
113 DINFO_STRUCT_FILE_ANY
/* Debug structs defined in all files. */
116 /* Generic structs (e.g. templates not explicitly specialized)
117 may not have a compilation unit associated with them, and so
118 may need to be treated differently from ordinary structs.
120 Structs only handled by reference (indirectly), will also usually
121 not need as much debugging information. */
123 static enum debug_struct_file debug_struct_ordinary
[DINFO_USAGE_NUM_ENUMS
]
124 = { DINFO_STRUCT_FILE_ANY
, DINFO_STRUCT_FILE_ANY
, DINFO_STRUCT_FILE_ANY
};
125 static enum debug_struct_file debug_struct_generic
[DINFO_USAGE_NUM_ENUMS
]
126 = { DINFO_STRUCT_FILE_ANY
, DINFO_STRUCT_FILE_ANY
, DINFO_STRUCT_FILE_ANY
};
128 /* Parse the -femit-struct-debug-detailed option value
129 and set the flag variables. */
131 #define MATCH( prefix, string ) \
132 ((strncmp (prefix, string, sizeof prefix - 1) == 0) \
133 ? ((string += sizeof prefix - 1), 1) : 0)
136 set_struct_debug_option (const char *spec
)
138 /* various labels for comparison */
139 static char dfn_lbl
[] = "dfn:", dir_lbl
[] = "dir:", ind_lbl
[] = "ind:";
140 static char ord_lbl
[] = "ord:", gen_lbl
[] = "gen:";
141 static char none_lbl
[] = "none", any_lbl
[] = "any";
142 static char base_lbl
[] = "base", sys_lbl
[] = "sys";
144 enum debug_struct_file files
= DINFO_STRUCT_FILE_ANY
;
145 /* Default is to apply to as much as possible. */
146 enum debug_info_usage usage
= DINFO_USAGE_NUM_ENUMS
;
147 int ord
= 1, gen
= 1;
150 if (MATCH (dfn_lbl
, spec
))
151 usage
= DINFO_USAGE_DFN
;
152 else if (MATCH (dir_lbl
, spec
))
153 usage
= DINFO_USAGE_DIR_USE
;
154 else if (MATCH (ind_lbl
, spec
))
155 usage
= DINFO_USAGE_IND_USE
;
157 /* Generics or not? */
158 if (MATCH (ord_lbl
, spec
))
160 else if (MATCH (gen_lbl
, spec
))
163 /* What allowable environment? */
164 if (MATCH (none_lbl
, spec
))
165 files
= DINFO_STRUCT_FILE_NONE
;
166 else if (MATCH (any_lbl
, spec
))
167 files
= DINFO_STRUCT_FILE_ANY
;
168 else if (MATCH (sys_lbl
, spec
))
169 files
= DINFO_STRUCT_FILE_SYS
;
170 else if (MATCH (base_lbl
, spec
))
171 files
= DINFO_STRUCT_FILE_BASE
;
173 error ("argument %qs to %<-femit-struct-debug-detailed%> not recognized",
176 /* Effect the specification. */
177 if (usage
== DINFO_USAGE_NUM_ENUMS
)
181 debug_struct_ordinary
[DINFO_USAGE_DFN
] = files
;
182 debug_struct_ordinary
[DINFO_USAGE_DIR_USE
] = files
;
183 debug_struct_ordinary
[DINFO_USAGE_IND_USE
] = files
;
187 debug_struct_generic
[DINFO_USAGE_DFN
] = files
;
188 debug_struct_generic
[DINFO_USAGE_DIR_USE
] = files
;
189 debug_struct_generic
[DINFO_USAGE_IND_USE
] = files
;
195 debug_struct_ordinary
[usage
] = files
;
197 debug_struct_generic
[usage
] = files
;
201 set_struct_debug_option (spec
+1);
204 /* No more -femit-struct-debug-detailed specifications.
207 error ("argument %qs to %<-femit-struct-debug-detailed%> unknown",
209 if (debug_struct_ordinary
[DINFO_USAGE_DIR_USE
]
210 < debug_struct_ordinary
[DINFO_USAGE_IND_USE
]
211 || debug_struct_generic
[DINFO_USAGE_DIR_USE
]
212 < debug_struct_generic
[DINFO_USAGE_IND_USE
])
213 error ("%<-femit-struct-debug-detailed=dir:...%> must allow at least"
214 " as much as %<-femit-struct-debug-detailed=ind:...%>");
218 /* Find the base name of a path, stripping off both directories and
219 a single final extension. */
221 base_of_path (const char *path
, const char **base_out
)
223 const char *base
= path
;
225 const char *p
= path
;
229 if (IS_DIR_SEPARATOR(c
))
244 /* Match the base name of a file to the base name of a compilation unit. */
246 static const char *main_input_basename
;
247 static int main_input_baselength
;
250 matches_main_base (const char *path
)
252 /* Cache the last query. */
253 static const char *last_path
= NULL
;
254 static int last_match
= 0;
255 if (path
!= last_path
)
258 int length
= base_of_path (path
, &base
);
260 last_match
= (length
== main_input_baselength
261 && memcmp (base
, main_input_basename
, length
) == 0);
266 #ifdef DEBUG_DEBUG_STRUCT
269 dump_struct_debug (tree type
, enum debug_info_usage usage
,
270 enum debug_struct_file criterion
, int generic
,
271 int matches
, int result
)
273 /* Find the type name. */
274 tree type_decl
= TYPE_STUB_DECL (type
);
276 const char *name
= 0;
277 if (TREE_CODE (t
) == TYPE_DECL
)
280 name
= IDENTIFIER_POINTER (t
);
282 fprintf (stderr
, " struct %d %s %s %s %s %d %p %s\n",
284 DECL_IN_SYSTEM_HEADER (type_decl
) ? "sys" : "usr",
285 matches
? "bas" : "hdr",
286 generic
? "gen" : "ord",
287 usage
== DINFO_USAGE_DFN
? ";" :
288 usage
== DINFO_USAGE_DIR_USE
? "." : "*",
290 (void*) type_decl
, name
);
293 #define DUMP_GSTRUCT(type, usage, criterion, generic, matches, result) \
294 dump_struct_debug (type, usage, criterion, generic, matches, result)
298 #define DUMP_GSTRUCT(type, usage, criterion, generic, matches, result) \
305 should_emit_struct_debug (tree type
, enum debug_info_usage usage
)
307 enum debug_struct_file criterion
;
309 bool generic
= lang_hooks
.types
.generic_p (type
);
312 criterion
= debug_struct_generic
[usage
];
314 criterion
= debug_struct_ordinary
[usage
];
316 if (criterion
== DINFO_STRUCT_FILE_NONE
)
317 return DUMP_GSTRUCT (type
, usage
, criterion
, generic
, false, false);
318 if (criterion
== DINFO_STRUCT_FILE_ANY
)
319 return DUMP_GSTRUCT (type
, usage
, criterion
, generic
, false, true);
321 type_decl
= TYPE_STUB_DECL (type
);
323 if (criterion
== DINFO_STRUCT_FILE_SYS
&& DECL_IN_SYSTEM_HEADER (type_decl
))
324 return DUMP_GSTRUCT (type
, usage
, criterion
, generic
, false, true);
326 if (matches_main_base (DECL_SOURCE_FILE (type_decl
)))
327 return DUMP_GSTRUCT (type
, usage
, criterion
, generic
, true, true);
328 return DUMP_GSTRUCT (type
, usage
, criterion
, generic
, false, false);
331 /* Nonzero means use GNU-only extensions in the generated symbolic
332 debugging information. Currently, this only has an effect when
333 write_symbols is set to DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG. */
334 bool use_gnu_debug_info_extensions
;
336 /* The default visibility for all symbols (unless overridden) */
337 enum symbol_visibility default_visibility
= VISIBILITY_DEFAULT
;
339 /* Disable unit-at-a-time for frontends that might be still broken in this
342 bool no_unit_at_a_time_default
;
344 /* Global visibility options. */
345 struct visibility_flags visibility_options
;
347 /* What to print when a switch has no documentation. */
348 static const char undocumented_msg
[] = N_("This switch lacks documentation");
350 /* Used for bookkeeping on whether user set these flags so
351 -fprofile-use/-fprofile-generate does not use them. */
352 static bool profile_arc_flag_set
, flag_profile_values_set
;
353 static bool flag_unroll_loops_set
, flag_tracer_set
;
354 static bool flag_value_profile_transformations_set
;
355 static bool flag_peel_loops_set
, flag_branch_probabilities_set
;
357 /* Functions excluded from profiling. */
359 typedef char *char_p
; /* For DEF_VEC_P. */
361 DEF_VEC_ALLOC_P(char_p
,heap
);
363 static VEC(char_p
,heap
) *flag_instrument_functions_exclude_functions
;
364 static VEC(char_p
,heap
) *flag_instrument_functions_exclude_files
;
366 /* Input file names. */
367 const char **in_fnames
;
368 unsigned num_in_fnames
;
370 static int common_handle_option (size_t scode
, const char *arg
, int value
,
371 unsigned int lang_mask
);
372 static void handle_param (const char *);
373 static void set_Wextra (int);
374 static unsigned int handle_option (const char **argv
, unsigned int lang_mask
);
375 static char *write_langs (unsigned int lang_mask
);
376 static void complain_wrong_lang (const char *, const struct cl_option
*,
377 unsigned int lang_mask
);
378 static void handle_options (unsigned int, const char **, unsigned int);
379 static void set_debug_level (enum debug_info_type type
, int extended
,
382 /* If ARG is a non-negative integer made up solely of digits, return its
383 value, otherwise return -1. */
385 integral_argument (const char *arg
)
389 while (*p
&& ISDIGIT (*p
))
398 /* Return a malloced slash-separated list of languages in MASK. */
400 write_langs (unsigned int mask
)
402 unsigned int n
= 0, len
= 0;
403 const char *lang_name
;
406 for (n
= 0; (lang_name
= lang_names
[n
]) != 0; n
++)
407 if (mask
& (1U << n
))
408 len
+= strlen (lang_name
) + 1;
410 result
= XNEWVEC (char, len
);
412 for (n
= 0; (lang_name
= lang_names
[n
]) != 0; n
++)
413 if (mask
& (1U << n
))
417 strcpy (result
+ len
, lang_name
);
418 len
+= strlen (lang_name
);
426 /* Complain that switch OPT_INDEX does not apply to this front end. */
428 complain_wrong_lang (const char *text
, const struct cl_option
*option
,
429 unsigned int lang_mask
)
431 char *ok_langs
, *bad_lang
;
433 ok_langs
= write_langs (option
->flags
);
434 bad_lang
= write_langs (lang_mask
);
436 /* Eventually this should become a hard error IMO. */
437 warning (0, "command line option \"%s\" is valid for %s but not for %s",
438 text
, ok_langs
, bad_lang
);
444 /* Handle the switch beginning at ARGV for the language indicated by
445 LANG_MASK. Returns the number of switches consumed. */
447 handle_option (const char **argv
, unsigned int lang_mask
)
450 const char *opt
, *arg
= 0;
453 unsigned int result
= 0;
454 const struct cl_option
*option
;
458 opt_index
= find_opt (opt
+ 1, lang_mask
| CL_COMMON
| CL_TARGET
);
459 if (opt_index
== cl_options_count
460 && (opt
[1] == 'W' || opt
[1] == 'f' || opt
[1] == 'm')
461 && opt
[2] == 'n' && opt
[3] == 'o' && opt
[4] == '-')
463 /* Drop the "no-" from negative switches. */
464 size_t len
= strlen (opt
) - 3;
466 dup
= XNEWVEC (char, len
+ 1);
469 memcpy (dup
+ 2, opt
+ 5, len
- 2 + 1);
472 opt_index
= find_opt (opt
+ 1, lang_mask
| CL_COMMON
| CL_TARGET
);
475 if (opt_index
== cl_options_count
)
478 option
= &cl_options
[opt_index
];
480 /* Reject negative form of switches that don't take negatives as
482 if (!value
&& (option
->flags
& CL_REJECT_NEGATIVE
))
485 /* We've recognized this switch. */
488 /* Check to see if the option is disabled for this configuration. */
489 if (option
->flags
& CL_DISABLED
)
491 error ("command line option %qs"
492 " is not supported by this configuration", opt
);
496 /* Sort out any argument the switch takes. */
497 if (option
->flags
& CL_JOINED
)
499 /* Have arg point to the original switch. This is because
500 some code, such as disable_builtin_function, expects its
501 argument to be persistent until the program exits. */
502 arg
= argv
[0] + cl_options
[opt_index
].opt_len
+ 1;
504 arg
+= strlen ("no-");
506 if (*arg
== '\0' && !(option
->flags
& CL_MISSING_OK
))
508 if (option
->flags
& CL_SEPARATE
)
514 /* Missing argument. */
518 else if (option
->flags
& CL_SEPARATE
)
524 /* Now we've swallowed any potential argument, complain if this
525 is a switch for a different front end. */
526 if (!(option
->flags
& (lang_mask
| CL_COMMON
| CL_TARGET
)))
528 complain_wrong_lang (argv
[0], option
, lang_mask
);
531 else if ((option
->flags
& CL_TARGET
)
532 && (option
->flags
& CL_LANG_ALL
)
533 && !(option
->flags
& lang_mask
))
535 /* Complain for target flag language mismatches if any languages
537 complain_wrong_lang (argv
[0], option
, lang_mask
);
541 if (arg
== NULL
&& (option
->flags
& (CL_JOINED
| CL_SEPARATE
)))
543 if (!lang_hooks
.missing_argument (opt
, opt_index
))
544 error ("missing argument to \"%s\"", opt
);
548 /* If the switch takes an integer, convert it. */
549 if (arg
&& (option
->flags
& CL_UINTEGER
))
551 value
= integral_argument (arg
);
554 error ("argument to \"%s\" should be a non-negative integer",
560 if (option
->flag_var
)
561 switch (option
->var_type
)
564 *(int *) option
->flag_var
= value
;
568 *(int *) option
->flag_var
= (value
570 : !option
->var_value
);
575 if ((value
!= 0) == (option
->var_type
== CLVC_BIT_SET
))
576 *(int *) option
->flag_var
|= option
->var_value
;
578 *(int *) option
->flag_var
&= ~option
->var_value
;
579 if (option
->flag_var
== &target_flags
)
580 target_flags_explicit
|= option
->var_value
;
584 *(const char **) option
->flag_var
= arg
;
588 if (option
->flags
& lang_mask
)
589 if (lang_hooks
.handle_option (opt_index
, arg
, value
) == 0)
592 if (result
&& (option
->flags
& CL_COMMON
))
593 if (common_handle_option (opt_index
, arg
, value
, lang_mask
) == 0)
596 if (result
&& (option
->flags
& CL_TARGET
))
597 if (!targetm
.handle_option (opt_index
, arg
, value
))
606 /* Handle FILENAME from the command line. */
608 add_input_filename (const char *filename
)
611 in_fnames
= xrealloc (in_fnames
, num_in_fnames
* sizeof (in_fnames
[0]));
612 in_fnames
[num_in_fnames
- 1] = filename
;
615 /* Add functions or file names to a vector of names to exclude from
619 add_instrument_functions_exclude_list (VEC(char_p
,heap
) **pvec
,
627 /* We never free this string. */
640 VEC_safe_push (char_p
, heap
, *pvec
, token_start
);
643 if (*r
== '\\' && r
[1] == ',')
651 if (*token_start
!= '\0')
652 VEC_safe_push (char_p
, heap
, *pvec
, token_start
);
655 /* Return whether we should exclude FNDECL from instrumentation. */
658 flag_instrument_functions_exclude_p (tree fndecl
)
660 if (VEC_length (char_p
, flag_instrument_functions_exclude_functions
) > 0)
666 name
= lang_hooks
.decl_printable_name (fndecl
, 0);
668 VEC_iterate (char_p
, flag_instrument_functions_exclude_functions
,
672 if (strstr (name
, s
) != NULL
)
677 if (VEC_length (char_p
, flag_instrument_functions_exclude_files
) > 0)
683 name
= DECL_SOURCE_FILE (fndecl
);
685 VEC_iterate (char_p
, flag_instrument_functions_exclude_files
, i
, s
);
688 if (strstr (name
, s
) != NULL
)
696 /* Decode and handle the vector of command line options. LANG_MASK
697 contains has a single bit set representing the current
700 handle_options (unsigned int argc
, const char **argv
, unsigned int lang_mask
)
704 for (i
= 1; i
< argc
; i
+= n
)
706 const char *opt
= argv
[i
];
708 /* Interpret "-" or a non-switch as a file name. */
709 if (opt
[0] != '-' || opt
[1] == '\0')
711 if (main_input_filename
== NULL
)
713 main_input_filename
= opt
;
714 main_input_baselength
715 = base_of_path (main_input_filename
, &main_input_basename
);
717 add_input_filename (opt
);
722 n
= handle_option (argv
+ i
, lang_mask
);
727 error ("unrecognized command line option \"%s\"", opt
);
732 /* Parse command line options and set default flag values. Do minimal
733 options processing. */
735 decode_options (unsigned int argc
, const char **argv
)
737 unsigned int i
, lang_mask
;
739 /* Perform language-specific options initialization. */
740 lang_mask
= lang_hooks
.init_options (argc
, argv
);
742 lang_hooks
.initialize_diagnostics (global_dc
);
744 /* Scan to see what optimization level has been specified. That will
745 determine the default value of many flags. */
746 for (i
= 1; i
< argc
; i
++)
748 if (!strcmp (argv
[i
], "-O"))
753 else if (argv
[i
][0] == '-' && argv
[i
][1] == 'O')
755 /* Handle -Os, -O2, -O3, -O69, ... */
756 const char *p
= &argv
[i
][2];
758 if ((p
[0] == 's') && (p
[1] == 0))
762 /* Optimizing for size forces optimize to be 2. */
767 const int optimize_val
= read_integral_parameter (p
, p
- 2, -1);
768 if (optimize_val
!= -1)
770 optimize
= optimize_val
;
779 flag_merge_constants
= 0;
786 flag_delayed_branch
= 1;
788 #ifdef CAN_DEBUG_WITHOUT_FP
789 flag_omit_frame_pointer
= 1;
791 flag_guess_branch_prob
= 1;
792 flag_cprop_registers
= 1;
793 flag_if_conversion
= 1;
794 flag_if_conversion2
= 1;
795 flag_ipa_pure_const
= 1;
796 flag_ipa_reference
= 1;
797 flag_split_wide_types
= 1;
804 flag_tree_copyrename
= 1;
806 flag_tree_copy_prop
= 1;
808 flag_tree_salias
= 1;
809 if (!no_unit_at_a_time_default
)
810 flag_unit_at_a_time
= 1;
814 /* Loop header copying usually increases size of the code. This used
815 not to be true, since quite often it is possible to verify that
816 the condition is satisfied in the first iteration and therefore
817 to eliminate it. Jump threading handles these cases now. */
824 flag_thread_jumps
= 1;
825 flag_crossjumping
= 1;
826 flag_optimize_sibling_calls
= 1;
827 flag_forward_propagate
= 1;
828 flag_cse_follow_jumps
= 1;
830 flag_expensive_optimizations
= 1;
831 flag_ipa_type_escape
= 1;
832 flag_rerun_cse_after_loop
= 1;
833 flag_caller_saves
= 1;
835 #ifdef INSN_SCHEDULING
836 flag_schedule_insns
= 1;
837 flag_schedule_insns_after_reload
= 1;
840 flag_strict_aliasing
= 1;
841 flag_strict_overflow
= 1;
842 flag_delete_null_pointer_checks
= 1;
843 flag_reorder_blocks
= 1;
844 flag_reorder_functions
= 1;
845 flag_tree_store_ccp
= 1;
846 flag_tree_store_copy_prop
= 1;
851 /* PRE tends to generate bigger code. */
855 /* Allow more virtual operators to increase alias precision. */
856 set_param_value ("max-aliased-vops", 500);
861 flag_predictive_commoning
= 1;
862 flag_inline_functions
= 1;
863 flag_unswitch_loops
= 1;
864 flag_gcse_after_reload
= 1;
866 /* Allow even more virtual operators. */
867 set_param_value ("max-aliased-vops", 1000);
868 set_param_value ("avg-aliased-vops", 3);
871 if (optimize
< 2 || optimize_size
)
878 /* Don't reorder blocks when optimizing for size because extra
879 jump insns may be created; also barrier may create extra padding.
881 More correctly we should have a block reordering mode that tried
882 to minimize the combined size of all the jumps. This would more
883 or less automatically remove extra jumps, but would also try to
884 use more short jumps instead of long jumps. */
885 flag_reorder_blocks
= 0;
886 flag_reorder_blocks_and_partition
= 0;
891 /* Inlining of functions reducing size is a good idea regardless
892 of them being declared inline. */
893 flag_inline_functions
= 1;
895 /* We want to crossjump as much as possible. */
896 set_param_value ("min-crossjump-insns", 1);
899 /* Initialize whether `char' is signed. */
900 flag_signed_char
= DEFAULT_SIGNED_CHAR
;
901 /* Set this to a special "uninitialized" value. The actual default is set
902 after target options have been processed. */
903 flag_short_enums
= 2;
905 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
907 target_flags
= targetm
.default_target_flags
;
909 /* Some tagets have ABI-specified unwind tables. */
910 flag_unwind_tables
= targetm
.unwind_tables_default
;
912 #ifdef OPTIMIZATION_OPTIONS
913 /* Allow default optimizations to be specified on a per-machine basis. */
914 OPTIMIZATION_OPTIONS (optimize
, optimize_size
);
917 handle_options (argc
, argv
, lang_mask
);
921 if (flag_pic
&& !flag_pie
)
924 if (flag_no_inline
== 2)
927 flag_really_no_inline
= flag_no_inline
;
929 /* Set flag_no_inline before the post_options () hook. The C front
930 ends use it to determine tree inlining defaults. FIXME: such
931 code should be lang-independent when all front ends use tree
932 inlining, in which case it, and this condition, should be moved
933 to the top of process_options() instead. */
936 /* Inlining does not work if not optimizing,
937 so force it not to be done. */
941 /* The c_decode_option function and decode_option hook set
942 this to `2' if -Wall is used, so we can avoid giving out
943 lots of errors for people who don't realize what -Wall does. */
944 if (warn_uninitialized
== 1)
945 warning (OPT_Wuninitialized
,
946 "-Wuninitialized is not supported without -O");
949 if (flag_really_no_inline
== 2)
950 flag_really_no_inline
= flag_no_inline
;
952 /* The optimization to partition hot and cold basic blocks into separate
953 sections of the .o and executable files does not work (currently)
954 with exception handling. This is because there is no support for
955 generating unwind info. If flag_exceptions is turned on we need to
956 turn off the partitioning optimization. */
958 if (flag_exceptions
&& flag_reorder_blocks_and_partition
)
961 ("-freorder-blocks-and-partition does not work with exceptions");
962 flag_reorder_blocks_and_partition
= 0;
963 flag_reorder_blocks
= 1;
966 /* If user requested unwind info, then turn off the partitioning
969 if (flag_unwind_tables
&& ! targetm
.unwind_tables_default
970 && flag_reorder_blocks_and_partition
)
972 inform ("-freorder-blocks-and-partition does not support unwind info");
973 flag_reorder_blocks_and_partition
= 0;
974 flag_reorder_blocks
= 1;
977 /* If the target requested unwind info, then turn off the partitioning
978 optimization with a different message. Likewise, if the target does not
979 support named sections. */
981 if (flag_reorder_blocks_and_partition
982 && (!targetm
.have_named_sections
983 || (flag_unwind_tables
&& targetm
.unwind_tables_default
)))
986 ("-freorder-blocks-and-partition does not work on this architecture");
987 flag_reorder_blocks_and_partition
= 0;
988 flag_reorder_blocks
= 1;
991 #ifndef IRA_COVER_CLASSES
994 inform ("-fira does not work on this architecture");
1000 #define LEFT_COLUMN 27
1002 /* Output ITEM, of length ITEM_WIDTH, in the left column,
1003 followed by word-wrapped HELP in a second column. */
1005 wrap_help (const char *help
,
1007 unsigned int item_width
,
1008 unsigned int columns
)
1010 unsigned int col_width
= LEFT_COLUMN
;
1011 unsigned int remaining
, room
, len
;
1013 remaining
= strlen (help
);
1017 room
= columns
- 3 - MAX (col_width
, item_width
);
1026 for (i
= 0; help
[i
]; i
++)
1028 if (i
>= room
&& len
!= remaining
)
1032 else if ((help
[i
] == '-' || help
[i
] == '/')
1033 && help
[i
+ 1] != ' '
1034 && i
> 0 && ISALPHA (help
[i
- 1]))
1039 printf( " %-*.*s %.*s\n", col_width
, item_width
, item
, len
, help
);
1041 while (help
[len
] == ' ')
1049 /* Print help for a specific front-end, etc. */
1051 print_filtered_help (unsigned int include_flags
,
1052 unsigned int exclude_flags
,
1053 unsigned int any_flags
,
1054 unsigned int columns
)
1058 static char *printed
= NULL
;
1060 bool displayed
= false;
1062 if (include_flags
== CL_PARAMS
)
1064 for (i
= 0; i
< LAST_PARAM
; i
++)
1066 const char *param
= compiler_params
[i
].option
;
1068 help
= compiler_params
[i
].help
;
1069 if (help
== NULL
|| *help
== '\0')
1071 if (exclude_flags
& CL_UNDOCUMENTED
)
1073 help
= undocumented_msg
;
1076 /* Get the translation. */
1079 wrap_help (help
, param
, strlen (param
), columns
);
1086 printed
= xcalloc (1, cl_options_count
);
1088 for (i
= 0; i
< cl_options_count
; i
++)
1090 static char new_help
[128];
1091 const struct cl_option
*option
= cl_options
+ i
;
1096 if (include_flags
== 0
1097 || ((option
->flags
& include_flags
) != include_flags
))
1099 if ((option
->flags
& any_flags
) == 0)
1103 /* Skip unwanted switches. */
1104 if ((option
->flags
& exclude_flags
) != 0)
1108 /* Skip switches that have already been printed. */
1114 help
= option
->help
;
1117 if (exclude_flags
& CL_UNDOCUMENTED
)
1119 help
= undocumented_msg
;
1122 /* Get the translation. */
1125 /* Find the gap between the name of the
1126 option and its descriptive text. */
1127 tab
= strchr (help
, '\t');
1136 opt
= option
->opt_text
;
1140 /* With the -Q option enabled we change the descriptive text associated
1141 with an option to be an indication of its current setting. */
1144 if (len
< (LEFT_COLUMN
+ 2))
1145 strcpy (new_help
, "\t\t");
1147 strcpy (new_help
, "\t");
1149 if (option
->flag_var
!= NULL
)
1151 if (option
->flags
& CL_JOINED
)
1153 if (option
->var_type
== CLVC_STRING
)
1155 if (* (const char **) option
->flag_var
!= NULL
)
1156 snprintf (new_help
+ strlen (new_help
),
1157 sizeof (new_help
) - strlen (new_help
),
1158 * (const char **) option
->flag_var
);
1161 sprintf (new_help
+ strlen (new_help
),
1162 "%#x", * (int *) option
->flag_var
);
1165 strcat (new_help
, option_enabled (i
)
1166 ? _("[enabled]") : _("[disabled]"));
1172 wrap_help (help
, opt
, len
, columns
);
1177 printf (_(" No options with the desired characteristics were found\n"));
1178 else if (! displayed
)
1179 printf (_(" All options with the desired characteristics have already been displayed\n"));
1184 /* Display help for a specified type of option.
1185 The options must have ALL of the INCLUDE_FLAGS set
1186 ANY of the flags in the ANY_FLAGS set
1187 and NONE of the EXCLUDE_FLAGS set. */
1189 print_specific_help (unsigned int include_flags
,
1190 unsigned int exclude_flags
,
1191 unsigned int any_flags
)
1193 unsigned int all_langs_mask
= (1U << cl_lang_count
) - 1;
1194 const char * description
= NULL
;
1195 const char * descrip_extra
= "";
1198 static unsigned int columns
= 0;
1200 /* Sanity check: Make sure that we do not have more
1201 languages than we have bits available to enumerate them. */
1202 gcc_assert ((1U << cl_lang_count
) < CL_MIN_OPTION_CLASS
);
1204 /* If we have not done so already, obtain
1205 the desired maximum width of the output. */
1210 GET_ENVIRONMENT (p
, "COLUMNS");
1213 int value
= atoi (p
);
1220 /* Use a reasonable default. */
1224 /* Decide upon the title for the options that we are going to display. */
1225 for (i
= 0, flag
= 1; flag
<= CL_MAX_OPTION_CLASS
; flag
<<= 1, i
++)
1227 switch (flag
& include_flags
)
1233 description
= _("The following options are target specific");
1236 description
= _("The following options control compiler warning messages");
1238 case CL_OPTIMIZATION
:
1239 description
= _("The following options control optimizations");
1242 description
= _("The following options are language-independent");
1245 description
= _("The --param option recognizes the following as parameters");
1248 if (i
>= cl_lang_count
)
1250 if ((exclude_flags
& ((1U << cl_lang_count
) - 1)) != 0)
1252 description
= _("The following options are specific to the language ");
1253 descrip_extra
= lang_names
[i
];
1256 description
= _("The following options are supported by the language ");
1257 descrip_extra
= lang_names
[i
];
1262 if (description
== NULL
)
1266 if (include_flags
== CL_UNDOCUMENTED
)
1267 description
= _("The following options are not documented");
1270 internal_error ("unrecognized include_flags 0x%x passed to print_specific_help",
1277 if (any_flags
& all_langs_mask
)
1278 description
= _("The following options are language-related");
1280 description
= _("The following options are language-independent");
1284 printf ("%s%s:\n", description
, descrip_extra
);
1285 print_filtered_help (include_flags
, exclude_flags
, any_flags
, columns
);
1288 /* Handle target- and language-independent options. Return zero to
1289 generate an "unknown option" message. Only options that need
1290 extra handling need to be listed here; if you simply want
1291 VALUE assigned to a variable, it happens automatically. */
1294 common_handle_option (size_t scode
, const char *arg
, int value
,
1295 unsigned int lang_mask
)
1297 enum opt_code code
= (enum opt_code
) scode
;
1308 unsigned int all_langs_mask
= (1U << cl_lang_count
) - 1;
1309 unsigned int undoc_mask
;
1312 undoc_mask
= extra_warnings
? 0 : CL_UNDOCUMENTED
;
1313 /* First display any single language specific options. */
1314 for (i
= 0; i
< cl_lang_count
; i
++)
1316 (1U << i
, (all_langs_mask
& (~ (1U << i
))) | undoc_mask
, 0);
1317 /* Next display any multi language specific options. */
1318 print_specific_help (0, undoc_mask
, all_langs_mask
);
1319 /* Then display any remaining, non-language options. */
1320 for (i
= CL_MIN_OPTION_CLASS
; i
<= CL_MAX_OPTION_CLASS
; i
<<= 1)
1321 print_specific_help (i
, undoc_mask
, 0);
1322 exit_after_options
= true;
1326 case OPT_ftarget_help
:
1327 case OPT__target_help
:
1328 print_specific_help (CL_TARGET
, CL_UNDOCUMENTED
, 0);
1329 exit_after_options
= true;
1331 /* Allow the target a chance to give the user some additional information. */
1332 if (targetm
.target_help
)
1333 targetm
.target_help ();
1339 const char * a
= arg
;
1340 unsigned int include_flags
= 0;
1341 /* Note - by default we include undocumented options when listing
1342 specific classes. If you only want to see documented options
1343 then add ",^undocumented" to the --help= option. e.g.:
1345 --help=target,^undocumented */
1346 unsigned int exclude_flags
= 0;
1348 /* Walk along the argument string, parsing each word in turn.
1350 arg = [^]{word}[,{arg}]
1351 word = {optimizers|target|warnings|undocumented|
1352 params|common|<language>} */
1357 const char * string
;
1362 { "optimizers", CL_OPTIMIZATION
},
1363 { "target", CL_TARGET
},
1364 { "warnings", CL_WARNING
},
1365 { "undocumented", CL_UNDOCUMENTED
},
1366 { "params", CL_PARAMS
},
1367 { "joined", CL_JOINED
},
1368 { "separate", CL_SEPARATE
},
1369 { "common", CL_COMMON
},
1372 unsigned int * pflags
;
1380 pflags
= & exclude_flags
;
1383 pflags
= & include_flags
;
1385 comma
= strchr (a
, ',');
1391 for (i
= 0; specifics
[i
].string
!= NULL
; i
++)
1392 if (strncasecmp (a
, specifics
[i
].string
, len
) == 0)
1394 * pflags
|= specifics
[i
].flag
;
1398 if (specifics
[i
].string
== NULL
)
1400 /* Check to see if the string matches a language name. */
1401 for (i
= 0; i
< cl_lang_count
; i
++)
1402 if (strncasecmp (a
, lang_names
[i
], len
) == 0)
1404 * pflags
|= 1U << i
;
1408 if (i
== cl_lang_count
)
1410 "warning: unrecognized argument to --help= switch: %.*s\n",
1420 print_specific_help (include_flags
, exclude_flags
, 0);
1421 exit_after_options
= true;
1426 print_version (stderr
, "");
1427 exit_after_options
= true;
1431 g_switch_value
= value
;
1432 g_switch_set
= true;
1437 /* Currently handled in a prescan. */
1441 /* For backward compatibility, -W is the same as -Wextra. */
1446 enable_warning_as_error (arg
, value
, lang_mask
);
1453 case OPT_Wlarger_than_
:
1454 larger_than_size
= value
;
1455 warn_larger_than
= value
!= -1;
1458 case OPT_Wstrict_aliasing
:
1459 set_Wstrict_aliasing (value
);
1462 case OPT_Wstrict_aliasing_
:
1463 warn_strict_aliasing
= value
;
1466 case OPT_Wstrict_overflow
:
1467 warn_strict_overflow
= (value
1468 ? (int) WARN_STRICT_OVERFLOW_CONDITIONAL
1472 case OPT_Wstrict_overflow_
:
1473 warn_strict_overflow
= value
;
1477 set_Wunused (value
);
1482 aux_info_file_name
= arg
;
1483 flag_gen_aux_info
= 1;
1487 aux_base_name
= arg
;
1490 case OPT_auxbase_strip
:
1492 char *tmp
= xstrdup (arg
);
1493 strip_off_ending (tmp
, strlen (tmp
));
1495 aux_base_name
= tmp
;
1500 decode_d_option (arg
);
1504 dump_base_name
= arg
;
1507 case OPT_falign_functions_
:
1508 align_functions
= value
;
1511 case OPT_falign_jumps_
:
1512 align_jumps
= value
;
1515 case OPT_falign_labels_
:
1516 align_labels
= value
;
1519 case OPT_falign_loops_
:
1520 align_loops
= value
;
1523 case OPT_fbranch_probabilities
:
1524 flag_branch_probabilities_set
= true;
1527 case OPT_fcall_used_
:
1528 fix_register (arg
, 0, 1);
1531 case OPT_fcall_saved_
:
1532 fix_register (arg
, 0, 0);
1536 dbg_cnt_process_opt (arg
);
1539 case OPT_fdbg_cnt_list
:
1540 dbg_cnt_list_all_counters ();
1543 case OPT_fdebug_prefix_map_
:
1544 add_debug_prefix_map (arg
);
1547 case OPT_fdiagnostics_show_location_
:
1548 if (!strcmp (arg
, "once"))
1549 diagnostic_prefixing_rule (global_dc
) = DIAGNOSTICS_SHOW_PREFIX_ONCE
;
1550 else if (!strcmp (arg
, "every-line"))
1551 diagnostic_prefixing_rule (global_dc
)
1552 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE
;
1557 case OPT_fdiagnostics_show_option
:
1558 global_dc
->show_option_requested
= true;
1562 if (!dump_switch_p (arg
))
1566 case OPT_ffast_math
:
1567 set_fast_math_flags (value
);
1571 fix_register (arg
, 1, 1);
1574 case OPT_finline_limit_
:
1575 case OPT_finline_limit_eq
:
1576 set_param_value ("max-inline-insns-single", value
/ 2);
1577 set_param_value ("max-inline-insns-auto", value
/ 2);
1580 case OPT_finstrument_functions_exclude_function_list_
:
1581 add_instrument_functions_exclude_list
1582 (&flag_instrument_functions_exclude_functions
, arg
);
1585 case OPT_finstrument_functions_exclude_file_list_
:
1586 add_instrument_functions_exclude_list
1587 (&flag_instrument_functions_exclude_files
, arg
);
1590 case OPT_fmessage_length_
:
1591 pp_set_line_maximum_length (global_dc
->printer
, value
);
1594 case OPT_fpack_struct_
:
1595 if (value
<= 0 || (value
& (value
- 1)) || value
> 16)
1596 error ("structure alignment must be a small power of two, not %d", value
);
1599 initial_max_fld_align
= value
;
1600 maximum_field_alignment
= value
* BITS_PER_UNIT
;
1604 case OPT_fpeel_loops
:
1605 flag_peel_loops_set
= true;
1608 case OPT_fprofile_arcs
:
1609 profile_arc_flag_set
= true;
1612 case OPT_fprofile_use
:
1613 if (!flag_branch_probabilities_set
)
1614 flag_branch_probabilities
= value
;
1615 if (!flag_profile_values_set
)
1616 flag_profile_values
= value
;
1617 if (!flag_unroll_loops_set
)
1618 flag_unroll_loops
= value
;
1619 if (!flag_peel_loops_set
)
1620 flag_peel_loops
= value
;
1621 if (!flag_tracer_set
)
1622 flag_tracer
= value
;
1623 if (!flag_value_profile_transformations_set
)
1624 flag_value_profile_transformations
= value
;
1627 case OPT_fprofile_generate
:
1628 if (!profile_arc_flag_set
)
1629 profile_arc_flag
= value
;
1630 if (!flag_profile_values_set
)
1631 flag_profile_values
= value
;
1632 if (!flag_value_profile_transformations_set
)
1633 flag_value_profile_transformations
= value
;
1636 case OPT_fprofile_values
:
1637 flag_profile_values_set
= true;
1640 case OPT_fvisibility_
:
1642 if (!strcmp(arg
, "default"))
1643 default_visibility
= VISIBILITY_DEFAULT
;
1644 else if (!strcmp(arg
, "internal"))
1645 default_visibility
= VISIBILITY_INTERNAL
;
1646 else if (!strcmp(arg
, "hidden"))
1647 default_visibility
= VISIBILITY_HIDDEN
;
1648 else if (!strcmp(arg
, "protected"))
1649 default_visibility
= VISIBILITY_PROTECTED
;
1651 error ("unrecognized visibility value \"%s\"", arg
);
1656 flag_value_profile_transformations_set
= true;
1659 case OPT_frandom_seed
:
1660 /* The real switch is -fno-random-seed. */
1663 set_random_seed (NULL
);
1666 case OPT_frandom_seed_
:
1667 set_random_seed (arg
);
1670 case OPT_fsched_verbose_
:
1671 #ifdef INSN_SCHEDULING
1672 fix_sched_param ("verbose", arg
);
1678 case OPT_fsched_stalled_insns_
:
1679 flag_sched_stalled_insns
= value
;
1680 if (flag_sched_stalled_insns
== 0)
1681 flag_sched_stalled_insns
= -1;
1684 case OPT_fsched_stalled_insns_dep_
:
1685 flag_sched_stalled_insns_dep
= value
;
1688 case OPT_fstack_limit
:
1689 /* The real switch is -fno-stack-limit. */
1692 stack_limit_rtx
= NULL_RTX
;
1695 case OPT_fstack_limit_register_
:
1697 int reg
= decode_reg_name (arg
);
1699 error ("unrecognized register name \"%s\"", arg
);
1701 stack_limit_rtx
= gen_rtx_REG (Pmode
, reg
);
1705 case OPT_fstack_limit_symbol_
:
1706 stack_limit_rtx
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (arg
));
1709 case OPT_ftree_vectorizer_verbose_
:
1710 vect_set_verbosity_level (arg
);
1713 case OPT_ftls_model_
:
1714 if (!strcmp (arg
, "global-dynamic"))
1715 flag_tls_default
= TLS_MODEL_GLOBAL_DYNAMIC
;
1716 else if (!strcmp (arg
, "local-dynamic"))
1717 flag_tls_default
= TLS_MODEL_LOCAL_DYNAMIC
;
1718 else if (!strcmp (arg
, "initial-exec"))
1719 flag_tls_default
= TLS_MODEL_INITIAL_EXEC
;
1720 else if (!strcmp (arg
, "local-exec"))
1721 flag_tls_default
= TLS_MODEL_LOCAL_EXEC
;
1723 warning (0, "unknown tls-model \"%s\"", arg
);
1726 case OPT_fira_algorithm_
:
1727 if (!strcmp (arg
, "regional"))
1728 flag_ira_algorithm
= IRA_ALGORITHM_REGIONAL
;
1729 else if (!strcmp (arg
, "CB"))
1730 flag_ira_algorithm
= IRA_ALGORITHM_CB
;
1731 else if (!strcmp (arg
, "mixed"))
1732 flag_ira_algorithm
= IRA_ALGORITHM_MIXED
;
1733 else if (!strcmp (arg
, "priority"))
1734 flag_ira_algorithm
= IRA_ALGORITHM_PRIORITY
;
1736 warning (0, "unknown ira algorithm \"%s\"", arg
);
1739 case OPT_fira_verbose_
:
1740 flag_ira_verbose
= value
;
1744 flag_tracer_set
= true;
1747 case OPT_funroll_loops
:
1748 flag_unroll_loops_set
= true;
1752 set_debug_level (NO_DEBUG
, DEFAULT_GDB_EXTENSIONS
, arg
);
1756 set_debug_level (SDB_DEBUG
, false, arg
);
1760 set_debug_level (DWARF2_DEBUG
, false, arg
);
1764 set_debug_level (NO_DEBUG
, 2, arg
);
1769 set_debug_level (DBX_DEBUG
, code
== OPT_gstabs_
, arg
);
1773 set_debug_level (VMS_DEBUG
, false, arg
);
1778 set_debug_level (XCOFF_DEBUG
, code
== OPT_gxcoff_
, arg
);
1782 asm_file_name
= arg
;
1785 case OPT_pedantic_errors
:
1786 flag_pedantic_errors
= pedantic
= 1;
1789 case OPT_floop_optimize
:
1790 case OPT_frerun_loop_opt
:
1791 case OPT_fstrength_reduce
:
1792 /* These are no-ops, preserved for backward compatibility. */
1796 /* If the flag was handled in a standard way, assume the lack of
1797 processing here is intentional. */
1798 gcc_assert (cl_options
[scode
].flag_var
);
1805 /* Handle --param NAME=VALUE. */
1807 handle_param (const char *carg
)
1812 arg
= xstrdup (carg
);
1813 equal
= strchr (arg
, '=');
1815 error ("%s: --param arguments should be of the form NAME=VALUE", arg
);
1818 value
= integral_argument (equal
+ 1);
1820 error ("invalid --param value %qs", equal
+ 1);
1824 set_param_value (arg
, value
);
1831 /* Handle -W and -Wextra. */
1833 set_Wextra (int setting
)
1835 extra_warnings
= setting
;
1836 warn_unused_parameter
= (setting
&& maybe_warn_unused_parameter
);
1838 /* We save the value of warn_uninitialized, since if they put
1839 -Wuninitialized on the command line, we need to generate a
1840 warning about not using it without also specifying -O. */
1842 warn_uninitialized
= 0;
1843 else if (warn_uninitialized
!= 1)
1844 warn_uninitialized
= 2;
1847 /* Initialize unused warning flags. */
1849 set_Wunused (int setting
)
1851 warn_unused_function
= setting
;
1852 warn_unused_label
= setting
;
1853 /* Unused function parameter warnings are reported when either
1854 ``-Wextra -Wunused'' or ``-Wunused-parameter'' is specified.
1855 Thus, if -Wextra has already been seen, set warn_unused_parameter;
1856 otherwise set maybe_warn_extra_parameter, which will be picked up
1858 maybe_warn_unused_parameter
= setting
;
1859 warn_unused_parameter
= (setting
&& extra_warnings
);
1860 warn_unused_variable
= setting
;
1861 warn_unused_value
= setting
;
1864 /* Used to set the level of strict aliasing warnings,
1865 when no level is specified (i.e., when -Wstrict-aliasing, and not
1866 -Wstrict-aliasing=level was given).
1867 ONOFF is assumed to take value 1 when -Wstrict-aliasing is specified,
1868 and 0 otherwise. After calling this function, wstrict_aliasing will be
1869 set to the default value of -Wstrict_aliasing=level, currently 3. */
1871 set_Wstrict_aliasing (int onoff
)
1873 gcc_assert (onoff
== 0 || onoff
== 1);
1875 warn_strict_aliasing
= 3;
1878 /* The following routines are useful in setting all the flags that
1879 -ffast-math and -fno-fast-math imply. */
1881 set_fast_math_flags (int set
)
1883 flag_trapping_math
= !set
;
1884 flag_unsafe_math_optimizations
= set
;
1885 flag_finite_math_only
= set
;
1886 flag_signed_zeros
= !set
;
1887 flag_errno_math
= !set
;
1890 flag_signaling_nans
= 0;
1891 flag_rounding_math
= 0;
1892 flag_cx_limited_range
= 1;
1896 /* Return true iff flags are set as if -ffast-math. */
1898 fast_math_flags_set_p (void)
1900 return (!flag_trapping_math
1901 && flag_unsafe_math_optimizations
1902 && flag_finite_math_only
1903 && !flag_signed_zeros
1904 && !flag_errno_math
);
1907 /* Handle a debug output -g switch. EXTENDED is true or false to support
1908 extended output (2 is special and means "-ggdb" was given). */
1910 set_debug_level (enum debug_info_type type
, int extended
, const char *arg
)
1912 static bool type_explicit
;
1914 use_gnu_debug_info_extensions
= extended
;
1916 if (type
== NO_DEBUG
)
1918 if (write_symbols
== NO_DEBUG
)
1920 write_symbols
= PREFERRED_DEBUGGING_TYPE
;
1924 #ifdef DWARF2_DEBUGGING_INFO
1925 write_symbols
= DWARF2_DEBUG
;
1926 #elif defined DBX_DEBUGGING_INFO
1927 write_symbols
= DBX_DEBUG
;
1931 if (write_symbols
== NO_DEBUG
)
1932 warning (0, "target system does not support debug output");
1937 /* Does it conflict with an already selected type? */
1938 if (type_explicit
&& write_symbols
!= NO_DEBUG
&& type
!= write_symbols
)
1939 error ("debug format \"%s\" conflicts with prior selection",
1940 debug_type_names
[type
]);
1941 write_symbols
= type
;
1942 type_explicit
= true;
1945 /* A debug flag without a level defaults to level 2. */
1948 if (!debug_info_level
)
1949 debug_info_level
= 2;
1953 debug_info_level
= integral_argument (arg
);
1954 if (debug_info_level
== (unsigned int) -1)
1955 error ("unrecognised debug output level \"%s\"", arg
);
1956 else if (debug_info_level
> 3)
1957 error ("debug output level %s is too high", arg
);
1961 /* Return 1 if OPTION is enabled, 0 if it is disabled, or -1 if it isn't
1962 a simple on-off switch. */
1965 option_enabled (int opt_idx
)
1967 const struct cl_option
*option
= &(cl_options
[opt_idx
]);
1969 if (option
->flag_var
)
1970 switch (option
->var_type
)
1973 return *(int *) option
->flag_var
!= 0;
1976 return *(int *) option
->flag_var
== option
->var_value
;
1978 case CLVC_BIT_CLEAR
:
1979 return (*(int *) option
->flag_var
& option
->var_value
) == 0;
1982 return (*(int *) option
->flag_var
& option
->var_value
) != 0;
1990 /* Fill STATE with the current state of option OPTION. Return true if
1991 there is some state to store. */
1994 get_option_state (int option
, struct cl_option_state
*state
)
1996 if (cl_options
[option
].flag_var
== 0)
1999 switch (cl_options
[option
].var_type
)
2003 state
->data
= cl_options
[option
].flag_var
;
2004 state
->size
= sizeof (int);
2007 case CLVC_BIT_CLEAR
:
2009 state
->ch
= option_enabled (option
);
2010 state
->data
= &state
->ch
;
2015 state
->data
= *(const char **) cl_options
[option
].flag_var
;
2016 if (state
->data
== 0)
2018 state
->size
= strlen (state
->data
) + 1;
2024 /* Enable a warning option as an error. This is used by -Werror= and
2025 also by legacy Werror-implicit-function-declaration. */
2028 enable_warning_as_error (const char *arg
, int value
, unsigned int lang_mask
)
2033 new_option
= XNEWVEC (char, strlen (arg
) + 2);
2034 new_option
[0] = 'W';
2035 strcpy (new_option
+ 1, arg
);
2036 option_index
= find_opt (new_option
, lang_mask
);
2037 if (option_index
== N_OPTS
)
2039 error ("-Werror=%s: No option -%s", arg
, new_option
);
2043 int kind
= value
? DK_ERROR
: DK_WARNING
;
2044 diagnostic_classify_diagnostic (global_dc
, option_index
, kind
);
2046 /* -Werror=foo implies -Wfoo. */
2047 if (cl_options
[option_index
].var_type
== CLVC_BOOLEAN
2048 && cl_options
[option_index
].flag_var
2049 && kind
== DK_ERROR
)
2050 *(int *) cl_options
[option_index
].flag_var
= 1;