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 /* True to warn about any function whose frame size is larger
63 bool warn_frame_larger_than
;
64 HOST_WIDE_INT frame_larger_than_size
;
66 /* Hack for cooperation between set_Wunused and set_Wextra. */
67 static bool maybe_warn_unused_parameter
;
69 /* Type(s) of debugging information we are producing (if any). See
70 flags.h for the definitions of the different possible types of
71 debugging information. */
72 enum debug_info_type write_symbols
= NO_DEBUG
;
74 /* Level of debugging information we are producing. See flags.h for
75 the definitions of the different possible levels. */
76 enum debug_info_level debug_info_level
= DINFO_LEVEL_NONE
;
78 /* A major contribution to object and executable size is debug
79 information size. A major contribution to debug information size
80 is struct descriptions replicated in several object files. The
81 following flags attempt to reduce this information. The basic
82 idea is to not emit struct debugging information in the current
83 compilation unit when that information will be generated by
84 another compilation unit.
86 Debug information for a struct defined in the current source
87 file should be generated in the object file. Likewise the
88 debug information for a struct defined in a header should be
89 generated in the object file of the corresponding source file.
90 Both of these case are handled when the base name of the file of
91 the struct definition matches the base name of the source file
92 of the current compilation unit. This matching emits minimal
93 struct debugging information.
95 The base file name matching rule above will fail to emit debug
96 information for structs defined in system headers. So a second
97 category of files includes system headers in addition to files
100 The remaining types of files are library headers and application
101 headers. We cannot currently distinguish these two types. */
103 enum debug_struct_file
105 DINFO_STRUCT_FILE_NONE
, /* Debug no structs. */
106 DINFO_STRUCT_FILE_BASE
, /* Debug structs defined in files with the
107 same base name as the compilation unit. */
108 DINFO_STRUCT_FILE_SYS
, /* Also debug structs defined in system
110 DINFO_STRUCT_FILE_ANY
/* Debug structs defined in all files. */
113 /* Generic structs (e.g. templates not explicitly specialized)
114 may not have a compilation unit associated with them, and so
115 may need to be treated differently from ordinary structs.
117 Structs only handled by reference (indirectly), will also usually
118 not need as much debugging information. */
120 static enum debug_struct_file debug_struct_ordinary
[DINFO_USAGE_NUM_ENUMS
]
121 = { DINFO_STRUCT_FILE_ANY
, DINFO_STRUCT_FILE_ANY
, DINFO_STRUCT_FILE_ANY
};
122 static enum debug_struct_file debug_struct_generic
[DINFO_USAGE_NUM_ENUMS
]
123 = { DINFO_STRUCT_FILE_ANY
, DINFO_STRUCT_FILE_ANY
, DINFO_STRUCT_FILE_ANY
};
125 /* Parse the -femit-struct-debug-detailed option value
126 and set the flag variables. */
128 #define MATCH( prefix, string ) \
129 ((strncmp (prefix, string, sizeof prefix - 1) == 0) \
130 ? ((string += sizeof prefix - 1), 1) : 0)
133 set_struct_debug_option (const char *spec
)
135 /* various labels for comparison */
136 static char dfn_lbl
[] = "dfn:", dir_lbl
[] = "dir:", ind_lbl
[] = "ind:";
137 static char ord_lbl
[] = "ord:", gen_lbl
[] = "gen:";
138 static char none_lbl
[] = "none", any_lbl
[] = "any";
139 static char base_lbl
[] = "base", sys_lbl
[] = "sys";
141 enum debug_struct_file files
= DINFO_STRUCT_FILE_ANY
;
142 /* Default is to apply to as much as possible. */
143 enum debug_info_usage usage
= DINFO_USAGE_NUM_ENUMS
;
144 int ord
= 1, gen
= 1;
147 if (MATCH (dfn_lbl
, spec
))
148 usage
= DINFO_USAGE_DFN
;
149 else if (MATCH (dir_lbl
, spec
))
150 usage
= DINFO_USAGE_DIR_USE
;
151 else if (MATCH (ind_lbl
, spec
))
152 usage
= DINFO_USAGE_IND_USE
;
154 /* Generics or not? */
155 if (MATCH (ord_lbl
, spec
))
157 else if (MATCH (gen_lbl
, spec
))
160 /* What allowable environment? */
161 if (MATCH (none_lbl
, spec
))
162 files
= DINFO_STRUCT_FILE_NONE
;
163 else if (MATCH (any_lbl
, spec
))
164 files
= DINFO_STRUCT_FILE_ANY
;
165 else if (MATCH (sys_lbl
, spec
))
166 files
= DINFO_STRUCT_FILE_SYS
;
167 else if (MATCH (base_lbl
, spec
))
168 files
= DINFO_STRUCT_FILE_BASE
;
170 error ("argument %qs to %<-femit-struct-debug-detailed%> not recognized",
173 /* Effect the specification. */
174 if (usage
== DINFO_USAGE_NUM_ENUMS
)
178 debug_struct_ordinary
[DINFO_USAGE_DFN
] = files
;
179 debug_struct_ordinary
[DINFO_USAGE_DIR_USE
] = files
;
180 debug_struct_ordinary
[DINFO_USAGE_IND_USE
] = files
;
184 debug_struct_generic
[DINFO_USAGE_DFN
] = files
;
185 debug_struct_generic
[DINFO_USAGE_DIR_USE
] = files
;
186 debug_struct_generic
[DINFO_USAGE_IND_USE
] = files
;
192 debug_struct_ordinary
[usage
] = files
;
194 debug_struct_generic
[usage
] = files
;
198 set_struct_debug_option (spec
+1);
201 /* No more -femit-struct-debug-detailed specifications.
204 error ("argument %qs to %<-femit-struct-debug-detailed%> unknown",
206 if (debug_struct_ordinary
[DINFO_USAGE_DIR_USE
]
207 < debug_struct_ordinary
[DINFO_USAGE_IND_USE
]
208 || debug_struct_generic
[DINFO_USAGE_DIR_USE
]
209 < debug_struct_generic
[DINFO_USAGE_IND_USE
])
210 error ("%<-femit-struct-debug-detailed=dir:...%> must allow at least"
211 " as much as %<-femit-struct-debug-detailed=ind:...%>");
215 /* Find the base name of a path, stripping off both directories and
216 a single final extension. */
218 base_of_path (const char *path
, const char **base_out
)
220 const char *base
= path
;
222 const char *p
= path
;
226 if (IS_DIR_SEPARATOR(c
))
241 /* Match the base name of a file to the base name of a compilation unit. */
243 static const char *main_input_basename
;
244 static int main_input_baselength
;
247 matches_main_base (const char *path
)
249 /* Cache the last query. */
250 static const char *last_path
= NULL
;
251 static int last_match
= 0;
252 if (path
!= last_path
)
255 int length
= base_of_path (path
, &base
);
257 last_match
= (length
== main_input_baselength
258 && memcmp (base
, main_input_basename
, length
) == 0);
263 #ifdef DEBUG_DEBUG_STRUCT
266 dump_struct_debug (tree type
, enum debug_info_usage usage
,
267 enum debug_struct_file criterion
, int generic
,
268 int matches
, int result
)
270 /* Find the type name. */
271 tree type_decl
= TYPE_STUB_DECL (type
);
273 const char *name
= 0;
274 if (TREE_CODE (t
) == TYPE_DECL
)
277 name
= IDENTIFIER_POINTER (t
);
279 fprintf (stderr
, " struct %d %s %s %s %s %d %p %s\n",
281 DECL_IN_SYSTEM_HEADER (type_decl
) ? "sys" : "usr",
282 matches
? "bas" : "hdr",
283 generic
? "gen" : "ord",
284 usage
== DINFO_USAGE_DFN
? ";" :
285 usage
== DINFO_USAGE_DIR_USE
? "." : "*",
287 (void*) type_decl
, name
);
290 #define DUMP_GSTRUCT(type, usage, criterion, generic, matches, result) \
291 dump_struct_debug (type, usage, criterion, generic, matches, result)
295 #define DUMP_GSTRUCT(type, usage, criterion, generic, matches, result) \
302 should_emit_struct_debug (tree type
, enum debug_info_usage usage
)
304 enum debug_struct_file criterion
;
306 bool generic
= lang_hooks
.types
.generic_p (type
);
309 criterion
= debug_struct_generic
[usage
];
311 criterion
= debug_struct_ordinary
[usage
];
313 if (criterion
== DINFO_STRUCT_FILE_NONE
)
314 return DUMP_GSTRUCT (type
, usage
, criterion
, generic
, false, false);
315 if (criterion
== DINFO_STRUCT_FILE_ANY
)
316 return DUMP_GSTRUCT (type
, usage
, criterion
, generic
, false, true);
318 type_decl
= TYPE_STUB_DECL (type
);
320 if (criterion
== DINFO_STRUCT_FILE_SYS
&& DECL_IN_SYSTEM_HEADER (type_decl
))
321 return DUMP_GSTRUCT (type
, usage
, criterion
, generic
, false, true);
323 if (matches_main_base (DECL_SOURCE_FILE (type_decl
)))
324 return DUMP_GSTRUCT (type
, usage
, criterion
, generic
, true, true);
325 return DUMP_GSTRUCT (type
, usage
, criterion
, generic
, false, false);
328 /* Nonzero means use GNU-only extensions in the generated symbolic
329 debugging information. Currently, this only has an effect when
330 write_symbols is set to DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG. */
331 bool use_gnu_debug_info_extensions
;
333 /* The default visibility for all symbols (unless overridden) */
334 enum symbol_visibility default_visibility
= VISIBILITY_DEFAULT
;
336 /* Disable unit-at-a-time for frontends that might be still broken in this
339 bool no_unit_at_a_time_default
;
341 /* Global visibility options. */
342 struct visibility_flags visibility_options
;
344 /* What to print when a switch has no documentation. */
345 #ifdef ENABLE_CHECKING
346 static const char undocumented_msg
[] = N_("This switch lacks documentation");
348 static const char undocumented_msg
[] = "";
351 /* Used for bookkeeping on whether user set these flags so
352 -fprofile-use/-fprofile-generate does not use them. */
353 static bool profile_arc_flag_set
, flag_profile_values_set
;
354 static bool flag_unroll_loops_set
, flag_tracer_set
;
355 static bool flag_value_profile_transformations_set
;
356 static bool flag_peel_loops_set
, flag_branch_probabilities_set
;
357 static bool flag_inline_functions_set
;
359 /* Functions excluded from profiling. */
361 typedef char *char_p
; /* For DEF_VEC_P. */
363 DEF_VEC_ALLOC_P(char_p
,heap
);
365 static VEC(char_p
,heap
) *flag_instrument_functions_exclude_functions
;
366 static VEC(char_p
,heap
) *flag_instrument_functions_exclude_files
;
368 typedef const char *const_char_p
; /* For DEF_VEC_P. */
369 DEF_VEC_P(const_char_p
);
370 DEF_VEC_ALLOC_P(const_char_p
,heap
);
372 static VEC(const_char_p
,heap
) *ignored_options
;
374 /* Input file names. */
375 const char **in_fnames
;
376 unsigned num_in_fnames
;
378 static int common_handle_option (size_t scode
, const char *arg
, int value
,
379 unsigned int lang_mask
);
380 static void handle_param (const char *);
381 static void set_Wextra (int);
382 static unsigned int handle_option (const char **argv
, unsigned int lang_mask
);
383 static char *write_langs (unsigned int lang_mask
);
384 static void complain_wrong_lang (const char *, const struct cl_option
*,
385 unsigned int lang_mask
);
386 static void handle_options (unsigned int, const char **, unsigned int);
387 static void set_debug_level (enum debug_info_type type
, int extended
,
390 /* If ARG is a non-negative integer made up solely of digits, return its
391 value, otherwise return -1. */
393 integral_argument (const char *arg
)
397 while (*p
&& ISDIGIT (*p
))
406 /* Return a malloced slash-separated list of languages in MASK. */
408 write_langs (unsigned int mask
)
410 unsigned int n
= 0, len
= 0;
411 const char *lang_name
;
414 for (n
= 0; (lang_name
= lang_names
[n
]) != 0; n
++)
415 if (mask
& (1U << n
))
416 len
+= strlen (lang_name
) + 1;
418 result
= XNEWVEC (char, len
);
420 for (n
= 0; (lang_name
= lang_names
[n
]) != 0; n
++)
421 if (mask
& (1U << n
))
425 strcpy (result
+ len
, lang_name
);
426 len
+= strlen (lang_name
);
434 /* Complain that switch OPT_INDEX does not apply to this front end. */
436 complain_wrong_lang (const char *text
, const struct cl_option
*option
,
437 unsigned int lang_mask
)
439 char *ok_langs
, *bad_lang
;
441 ok_langs
= write_langs (option
->flags
);
442 bad_lang
= write_langs (lang_mask
);
444 /* Eventually this should become a hard error IMO. */
445 warning (0, "command line option \"%s\" is valid for %s but not for %s",
446 text
, ok_langs
, bad_lang
);
452 /* Buffer the unknown option described by the string OPT. Currently,
453 we only complain about unknown -Wno-* options if they may have
454 prevented a diagnostic. Otherwise, we just ignore them. */
456 static void postpone_unknown_option_error(const char *opt
)
458 VEC_safe_push (const_char_p
, heap
, ignored_options
, opt
);
461 /* Produce an error for each option previously buffered. */
463 void print_ignored_options (void)
465 location_t saved_loc
= input_location
;
469 while (!VEC_empty (const_char_p
, ignored_options
))
472 opt
= VEC_pop (const_char_p
, ignored_options
);
473 error ("unrecognized command line option \"%s\"", opt
);
476 input_location
= saved_loc
;
479 /* Handle the switch beginning at ARGV for the language indicated by
480 LANG_MASK. Returns the number of switches consumed. */
482 handle_option (const char **argv
, unsigned int lang_mask
)
485 const char *opt
, *arg
= 0;
488 unsigned int result
= 0;
489 const struct cl_option
*option
;
493 opt_index
= find_opt (opt
+ 1, lang_mask
| CL_COMMON
| CL_TARGET
);
494 if (opt_index
== cl_options_count
495 && (opt
[1] == 'W' || opt
[1] == 'f' || opt
[1] == 'm')
496 && opt
[2] == 'n' && opt
[3] == 'o' && opt
[4] == '-')
498 /* Drop the "no-" from negative switches. */
499 size_t len
= strlen (opt
) - 3;
501 dup
= XNEWVEC (char, len
+ 1);
504 memcpy (dup
+ 2, opt
+ 5, len
- 2 + 1);
507 opt_index
= find_opt (opt
+ 1, lang_mask
| CL_COMMON
| CL_TARGET
);
508 if (opt_index
== cl_options_count
&& opt
[1] == 'W')
510 /* We don't generate errors for unknown -Wno-* options
511 unless we issue diagnostics. */
512 postpone_unknown_option_error (argv
[0]);
518 if (opt_index
== cl_options_count
)
521 option
= &cl_options
[opt_index
];
523 /* Reject negative form of switches that don't take negatives as
525 if (!value
&& (option
->flags
& CL_REJECT_NEGATIVE
))
528 /* We've recognized this switch. */
531 /* Check to see if the option is disabled for this configuration. */
532 if (option
->flags
& CL_DISABLED
)
534 error ("command line option %qs"
535 " is not supported by this configuration", opt
);
539 /* Sort out any argument the switch takes. */
540 if (option
->flags
& CL_JOINED
)
542 /* Have arg point to the original switch. This is because
543 some code, such as disable_builtin_function, expects its
544 argument to be persistent until the program exits. */
545 arg
= argv
[0] + cl_options
[opt_index
].opt_len
+ 1;
547 arg
+= strlen ("no-");
549 if (*arg
== '\0' && !(option
->flags
& CL_MISSING_OK
))
551 if (option
->flags
& CL_SEPARATE
)
557 /* Missing argument. */
561 else if (option
->flags
& CL_SEPARATE
)
567 /* Now we've swallowed any potential argument, complain if this
568 is a switch for a different front end. */
569 if (!(option
->flags
& (lang_mask
| CL_COMMON
| CL_TARGET
)))
571 complain_wrong_lang (argv
[0], option
, lang_mask
);
574 else if ((option
->flags
& CL_TARGET
)
575 && (option
->flags
& CL_LANG_ALL
)
576 && !(option
->flags
& lang_mask
))
578 /* Complain for target flag language mismatches if any languages
580 complain_wrong_lang (argv
[0], option
, lang_mask
);
584 if (arg
== NULL
&& (option
->flags
& (CL_JOINED
| CL_SEPARATE
)))
586 if (!lang_hooks
.missing_argument (opt
, opt_index
))
587 error ("missing argument to \"%s\"", opt
);
591 /* If the switch takes an integer, convert it. */
592 if (arg
&& (option
->flags
& CL_UINTEGER
))
594 value
= integral_argument (arg
);
597 error ("argument to \"%s\" should be a non-negative integer",
603 if (option
->flag_var
)
604 switch (option
->var_type
)
607 *(int *) option
->flag_var
= value
;
611 *(int *) option
->flag_var
= (value
613 : !option
->var_value
);
618 if ((value
!= 0) == (option
->var_type
== CLVC_BIT_SET
))
619 *(int *) option
->flag_var
|= option
->var_value
;
621 *(int *) option
->flag_var
&= ~option
->var_value
;
622 if (option
->flag_var
== &target_flags
)
623 target_flags_explicit
|= option
->var_value
;
627 *(const char **) option
->flag_var
= arg
;
631 if (option
->flags
& lang_mask
)
632 if (lang_hooks
.handle_option (opt_index
, arg
, value
) == 0)
635 if (result
&& (option
->flags
& CL_COMMON
))
636 if (common_handle_option (opt_index
, arg
, value
, lang_mask
) == 0)
639 if (result
&& (option
->flags
& CL_TARGET
))
640 if (!targetm
.handle_option (opt_index
, arg
, value
))
649 /* Handle FILENAME from the command line. */
651 add_input_filename (const char *filename
)
654 in_fnames
= xrealloc (in_fnames
, num_in_fnames
* sizeof (in_fnames
[0]));
655 in_fnames
[num_in_fnames
- 1] = filename
;
658 /* Add functions or file names to a vector of names to exclude from
662 add_instrument_functions_exclude_list (VEC(char_p
,heap
) **pvec
,
670 /* We never free this string. */
683 VEC_safe_push (char_p
, heap
, *pvec
, token_start
);
686 if (*r
== '\\' && r
[1] == ',')
694 if (*token_start
!= '\0')
695 VEC_safe_push (char_p
, heap
, *pvec
, token_start
);
698 /* Return whether we should exclude FNDECL from instrumentation. */
701 flag_instrument_functions_exclude_p (tree fndecl
)
703 if (VEC_length (char_p
, flag_instrument_functions_exclude_functions
) > 0)
709 name
= lang_hooks
.decl_printable_name (fndecl
, 0);
711 VEC_iterate (char_p
, flag_instrument_functions_exclude_functions
,
715 if (strstr (name
, s
) != NULL
)
720 if (VEC_length (char_p
, flag_instrument_functions_exclude_files
) > 0)
726 name
= DECL_SOURCE_FILE (fndecl
);
728 VEC_iterate (char_p
, flag_instrument_functions_exclude_files
, i
, s
);
731 if (strstr (name
, s
) != NULL
)
739 /* Decode and handle the vector of command line options. LANG_MASK
740 contains has a single bit set representing the current
743 handle_options (unsigned int argc
, const char **argv
, unsigned int lang_mask
)
747 for (i
= 1; i
< argc
; i
+= n
)
749 const char *opt
= argv
[i
];
751 /* Interpret "-" or a non-switch as a file name. */
752 if (opt
[0] != '-' || opt
[1] == '\0')
754 if (main_input_filename
== NULL
)
756 main_input_filename
= opt
;
757 main_input_baselength
758 = base_of_path (main_input_filename
, &main_input_basename
);
760 add_input_filename (opt
);
765 n
= handle_option (argv
+ i
, lang_mask
);
770 error ("unrecognized command line option \"%s\"", opt
);
775 /* Parse command line options and set default flag values. Do minimal
776 options processing. */
778 decode_options (unsigned int argc
, const char **argv
)
780 unsigned int i
, lang_mask
;
782 /* Perform language-specific options initialization. */
783 lang_mask
= lang_hooks
.init_options (argc
, argv
);
785 lang_hooks
.initialize_diagnostics (global_dc
);
787 /* Scan to see what optimization level has been specified. That will
788 determine the default value of many flags. */
789 for (i
= 1; i
< argc
; i
++)
791 if (!strcmp (argv
[i
], "-O"))
796 else if (argv
[i
][0] == '-' && argv
[i
][1] == 'O')
798 /* Handle -Os, -O2, -O3, -O69, ... */
799 const char *p
= &argv
[i
][2];
801 if ((p
[0] == 's') && (p
[1] == 0))
805 /* Optimizing for size forces optimize to be 2. */
810 const int optimize_val
= read_integral_parameter (p
, p
- 2, -1);
811 if (optimize_val
!= -1)
813 optimize
= optimize_val
;
822 flag_merge_constants
= 0;
829 flag_delayed_branch
= 1;
831 #ifdef CAN_DEBUG_WITHOUT_FP
832 flag_omit_frame_pointer
= 1;
834 flag_guess_branch_prob
= 1;
835 flag_cprop_registers
= 1;
836 flag_if_conversion
= 1;
837 flag_if_conversion2
= 1;
838 flag_ipa_pure_const
= 1;
839 flag_ipa_reference
= 1;
840 flag_split_wide_types
= 1;
847 flag_tree_copyrename
= 1;
849 flag_tree_copy_prop
= 1;
851 flag_tree_salias
= 1;
852 if (!no_unit_at_a_time_default
)
853 flag_unit_at_a_time
= 1;
857 /* Loop header copying usually increases size of the code. This used
858 not to be true, since quite often it is possible to verify that
859 the condition is satisfied in the first iteration and therefore
860 to eliminate it. Jump threading handles these cases now. */
867 flag_inline_small_functions
= 1;
868 flag_thread_jumps
= 1;
869 flag_crossjumping
= 1;
870 flag_optimize_sibling_calls
= 1;
871 flag_forward_propagate
= 1;
872 flag_cse_follow_jumps
= 1;
874 flag_expensive_optimizations
= 1;
875 flag_rerun_cse_after_loop
= 1;
876 flag_caller_saves
= 1;
878 #ifdef INSN_SCHEDULING
879 flag_schedule_insns
= 1;
880 flag_schedule_insns_after_reload
= 1;
883 flag_strict_aliasing
= 1;
884 flag_strict_overflow
= 1;
885 flag_delete_null_pointer_checks
= 1;
886 flag_reorder_blocks
= 1;
887 flag_reorder_functions
= 1;
888 flag_tree_store_ccp
= 1;
893 /* PRE tends to generate bigger code. */
897 /* Allow more virtual operators to increase alias precision. */
898 set_param_value ("max-aliased-vops", 500);
903 flag_predictive_commoning
= 1;
904 flag_inline_functions
= 1;
905 flag_unswitch_loops
= 1;
906 flag_gcse_after_reload
= 1;
907 flag_tree_vectorize
= 1;
909 /* Allow even more virtual operators. */
910 set_param_value ("max-aliased-vops", 1000);
911 set_param_value ("avg-aliased-vops", 3);
914 if (optimize
< 2 || optimize_size
)
921 /* Don't reorder blocks when optimizing for size because extra
922 jump insns may be created; also barrier may create extra padding.
924 More correctly we should have a block reordering mode that tried
925 to minimize the combined size of all the jumps. This would more
926 or less automatically remove extra jumps, but would also try to
927 use more short jumps instead of long jumps. */
928 flag_reorder_blocks
= 0;
929 flag_reorder_blocks_and_partition
= 0;
934 /* Inlining of functions reducing size is a good idea regardless
935 of them being declared inline. */
936 flag_inline_functions
= 1;
938 /* We want to crossjump as much as possible. */
939 set_param_value ("min-crossjump-insns", 1);
942 /* Initialize whether `char' is signed. */
943 flag_signed_char
= DEFAULT_SIGNED_CHAR
;
944 /* Set this to a special "uninitialized" value. The actual default is set
945 after target options have been processed. */
946 flag_short_enums
= 2;
948 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
950 target_flags
= targetm
.default_target_flags
;
952 /* Some tagets have ABI-specified unwind tables. */
953 flag_unwind_tables
= targetm
.unwind_tables_default
;
955 #ifdef OPTIMIZATION_OPTIONS
956 /* Allow default optimizations to be specified on a per-machine basis. */
957 OPTIMIZATION_OPTIONS (optimize
, optimize_size
);
960 handle_options (argc
, argv
, lang_mask
);
964 if (flag_pic
&& !flag_pie
)
967 if (flag_no_inline
== 2)
970 flag_really_no_inline
= flag_no_inline
;
972 /* Set flag_no_inline before the post_options () hook. The C front
973 ends use it to determine tree inlining defaults. FIXME: such
974 code should be lang-independent when all front ends use tree
975 inlining, in which case it, and this condition, should be moved
976 to the top of process_options() instead. */
979 /* Inlining does not work if not optimizing,
980 so force it not to be done. */
984 /* The c_decode_option function and decode_option hook set
985 this to `2' if -Wall is used, so we can avoid giving out
986 lots of errors for people who don't realize what -Wall does. */
987 if (warn_uninitialized
== 1)
988 warning (OPT_Wuninitialized
,
989 "-Wuninitialized is not supported without -O");
992 if (flag_really_no_inline
== 2)
993 flag_really_no_inline
= flag_no_inline
;
995 /* Inlining of functions called just once will only work if we can look
996 at the complete translation unit. */
997 if (flag_inline_functions_called_once
&& !flag_unit_at_a_time
)
999 flag_inline_functions_called_once
= 0;
1000 warning (OPT_Wdisabled_optimization
,
1001 "-funit-at-a-time is required for inlining of functions "
1002 "that are only called once");
1005 /* The optimization to partition hot and cold basic blocks into separate
1006 sections of the .o and executable files does not work (currently)
1007 with exception handling. This is because there is no support for
1008 generating unwind info. If flag_exceptions is turned on we need to
1009 turn off the partitioning optimization. */
1011 if (flag_exceptions
&& flag_reorder_blocks_and_partition
)
1014 ("-freorder-blocks-and-partition does not work with exceptions");
1015 flag_reorder_blocks_and_partition
= 0;
1016 flag_reorder_blocks
= 1;
1019 /* If user requested unwind info, then turn off the partitioning
1022 if (flag_unwind_tables
&& ! targetm
.unwind_tables_default
1023 && flag_reorder_blocks_and_partition
)
1025 inform ("-freorder-blocks-and-partition does not support unwind info");
1026 flag_reorder_blocks_and_partition
= 0;
1027 flag_reorder_blocks
= 1;
1030 /* If the target requested unwind info, then turn off the partitioning
1031 optimization with a different message. Likewise, if the target does not
1032 support named sections. */
1034 if (flag_reorder_blocks_and_partition
1035 && (!targetm
.have_named_sections
1036 || (flag_unwind_tables
&& targetm
.unwind_tables_default
)))
1039 ("-freorder-blocks-and-partition does not work on this architecture");
1040 flag_reorder_blocks_and_partition
= 0;
1041 flag_reorder_blocks
= 1;
1045 #define LEFT_COLUMN 27
1047 /* Output ITEM, of length ITEM_WIDTH, in the left column,
1048 followed by word-wrapped HELP in a second column. */
1050 wrap_help (const char *help
,
1052 unsigned int item_width
,
1053 unsigned int columns
)
1055 unsigned int col_width
= LEFT_COLUMN
;
1056 unsigned int remaining
, room
, len
;
1058 remaining
= strlen (help
);
1062 room
= columns
- 3 - MAX (col_width
, item_width
);
1071 for (i
= 0; help
[i
]; i
++)
1073 if (i
>= room
&& len
!= remaining
)
1077 else if ((help
[i
] == '-' || help
[i
] == '/')
1078 && help
[i
+ 1] != ' '
1079 && i
> 0 && ISALPHA (help
[i
- 1]))
1084 printf( " %-*.*s %.*s\n", col_width
, item_width
, item
, len
, help
);
1086 while (help
[len
] == ' ')
1094 /* Print help for a specific front-end, etc. */
1096 print_filtered_help (unsigned int include_flags
,
1097 unsigned int exclude_flags
,
1098 unsigned int any_flags
,
1099 unsigned int columns
)
1103 static char *printed
= NULL
;
1105 bool displayed
= false;
1107 if (include_flags
== CL_PARAMS
)
1109 for (i
= 0; i
< LAST_PARAM
; i
++)
1111 const char *param
= compiler_params
[i
].option
;
1113 help
= compiler_params
[i
].help
;
1114 if (help
== NULL
|| *help
== '\0')
1116 if (exclude_flags
& CL_UNDOCUMENTED
)
1118 help
= undocumented_msg
;
1121 /* Get the translation. */
1124 wrap_help (help
, param
, strlen (param
), columns
);
1131 printed
= xcalloc (1, cl_options_count
);
1133 for (i
= 0; i
< cl_options_count
; i
++)
1135 static char new_help
[128];
1136 const struct cl_option
*option
= cl_options
+ i
;
1141 if (include_flags
== 0
1142 || ((option
->flags
& include_flags
) != include_flags
))
1144 if ((option
->flags
& any_flags
) == 0)
1148 /* Skip unwanted switches. */
1149 if ((option
->flags
& exclude_flags
) != 0)
1153 /* Skip switches that have already been printed. */
1159 help
= option
->help
;
1162 if (exclude_flags
& CL_UNDOCUMENTED
)
1164 help
= undocumented_msg
;
1167 /* Get the translation. */
1170 /* Find the gap between the name of the
1171 option and its descriptive text. */
1172 tab
= strchr (help
, '\t');
1181 opt
= option
->opt_text
;
1185 /* With the -Q option enabled we change the descriptive text associated
1186 with an option to be an indication of its current setting. */
1189 if (len
< (LEFT_COLUMN
+ 2))
1190 strcpy (new_help
, "\t\t");
1192 strcpy (new_help
, "\t");
1194 if (option
->flag_var
!= NULL
)
1196 if (option
->flags
& CL_JOINED
)
1198 if (option
->var_type
== CLVC_STRING
)
1200 if (* (const char **) option
->flag_var
!= NULL
)
1201 snprintf (new_help
+ strlen (new_help
),
1202 sizeof (new_help
) - strlen (new_help
),
1203 * (const char **) option
->flag_var
);
1206 sprintf (new_help
+ strlen (new_help
),
1207 "%#x", * (int *) option
->flag_var
);
1210 strcat (new_help
, option_enabled (i
)
1211 ? _("[enabled]") : _("[disabled]"));
1217 wrap_help (help
, opt
, len
, columns
);
1223 unsigned int langs
= include_flags
& CL_LANG_ALL
;
1226 printf (_(" No options with the desired characteristics were found\n"));
1231 /* PR 31349: Tell the user how to see all of the
1232 options supported by a specific front end. */
1233 for (i
= 0; (1U << i
) < CL_LANG_ALL
; i
++)
1234 if ((1U << i
) & langs
)
1235 printf (_(" None found. Use --help=%s to show *all* the options supported by the %s front-end\n"),
1236 lang_names
[i
], lang_names
[i
]);
1240 else if (! displayed
)
1241 printf (_(" All options with the desired characteristics have already been displayed\n"));
1246 /* Display help for a specified type of option.
1247 The options must have ALL of the INCLUDE_FLAGS set
1248 ANY of the flags in the ANY_FLAGS set
1249 and NONE of the EXCLUDE_FLAGS set. */
1251 print_specific_help (unsigned int include_flags
,
1252 unsigned int exclude_flags
,
1253 unsigned int any_flags
)
1255 unsigned int all_langs_mask
= (1U << cl_lang_count
) - 1;
1256 const char * description
= NULL
;
1257 const char * descrip_extra
= "";
1260 static unsigned int columns
= 0;
1262 /* Sanity check: Make sure that we do not have more
1263 languages than we have bits available to enumerate them. */
1264 gcc_assert ((1U << cl_lang_count
) < CL_MIN_OPTION_CLASS
);
1266 /* If we have not done so already, obtain
1267 the desired maximum width of the output. */
1272 GET_ENVIRONMENT (p
, "COLUMNS");
1275 int value
= atoi (p
);
1282 /* Use a reasonable default. */
1286 /* Decide upon the title for the options that we are going to display. */
1287 for (i
= 0, flag
= 1; flag
<= CL_MAX_OPTION_CLASS
; flag
<<= 1, i
++)
1289 switch (flag
& include_flags
)
1295 description
= _("The following options are target specific");
1298 description
= _("The following options control compiler warning messages");
1300 case CL_OPTIMIZATION
:
1301 description
= _("The following options control optimizations");
1304 description
= _("The following options are language-independent");
1307 description
= _("The --param option recognizes the following as parameters");
1310 if (i
>= cl_lang_count
)
1312 if ((exclude_flags
& ((1U << cl_lang_count
) - 1)) != 0)
1313 description
= _("The following options are specific to just the language ");
1315 description
= _("The following options are supported by the language ");
1316 descrip_extra
= lang_names
[i
];
1321 if (description
== NULL
)
1325 if (include_flags
== CL_UNDOCUMENTED
)
1326 description
= _("The following options are not documented");
1329 internal_error ("unrecognized include_flags 0x%x passed to print_specific_help",
1336 if (any_flags
& all_langs_mask
)
1337 description
= _("The following options are language-related");
1339 description
= _("The following options are language-independent");
1343 printf ("%s%s:\n", description
, descrip_extra
);
1344 print_filtered_help (include_flags
, exclude_flags
, any_flags
, columns
);
1347 /* Handle target- and language-independent options. Return zero to
1348 generate an "unknown option" message. Only options that need
1349 extra handling need to be listed here; if you simply want
1350 VALUE assigned to a variable, it happens automatically. */
1353 common_handle_option (size_t scode
, const char *arg
, int value
,
1354 unsigned int lang_mask
)
1356 static bool verbose
= false;
1357 enum opt_code code
= (enum opt_code
) scode
;
1372 unsigned int all_langs_mask
= (1U << cl_lang_count
) - 1;
1373 unsigned int undoc_mask
;
1376 undoc_mask
= (verbose
| extra_warnings
) ? 0 : CL_UNDOCUMENTED
;
1377 /* First display any single language specific options. */
1378 for (i
= 0; i
< cl_lang_count
; i
++)
1380 (1U << i
, (all_langs_mask
& (~ (1U << i
))) | undoc_mask
, 0);
1381 /* Next display any multi language specific options. */
1382 print_specific_help (0, undoc_mask
, all_langs_mask
);
1383 /* Then display any remaining, non-language options. */
1384 for (i
= CL_MIN_OPTION_CLASS
; i
<= CL_MAX_OPTION_CLASS
; i
<<= 1)
1385 print_specific_help (i
, undoc_mask
, 0);
1386 exit_after_options
= true;
1390 case OPT_ftarget_help
:
1391 case OPT__target_help
:
1392 print_specific_help (CL_TARGET
, CL_UNDOCUMENTED
, 0);
1393 exit_after_options
= true;
1395 /* Allow the target a chance to give the user some additional information. */
1396 if (targetm
.target_help
)
1397 targetm
.target_help ();
1403 const char * a
= arg
;
1404 unsigned int include_flags
= 0;
1405 /* Note - by default we include undocumented options when listing
1406 specific classes. If you only want to see documented options
1407 then add ",^undocumented" to the --help= option. e.g.:
1409 --help=target,^undocumented */
1410 unsigned int exclude_flags
= 0;
1412 /* Walk along the argument string, parsing each word in turn.
1414 arg = [^]{word}[,{arg}]
1415 word = {optimizers|target|warnings|undocumented|
1416 params|common|<language>} */
1421 const char * string
;
1426 { "optimizers", CL_OPTIMIZATION
},
1427 { "target", CL_TARGET
},
1428 { "warnings", CL_WARNING
},
1429 { "undocumented", CL_UNDOCUMENTED
},
1430 { "params", CL_PARAMS
},
1431 { "joined", CL_JOINED
},
1432 { "separate", CL_SEPARATE
},
1433 { "common", CL_COMMON
},
1436 unsigned int * pflags
;
1438 unsigned int lang_flag
, specific_flag
;
1445 pflags
= & exclude_flags
;
1448 pflags
= & include_flags
;
1450 comma
= strchr (a
, ',');
1456 /* Check to see if the string matches an option class name. */
1457 for (i
= 0, specific_flag
= 0; specifics
[i
].string
!= NULL
; i
++)
1458 if (strncasecmp (a
, specifics
[i
].string
, len
) == 0)
1460 specific_flag
= specifics
[i
].flag
;
1464 /* Check to see if the string matches a language name.
1465 Note - we rely upon the alpha-sorted nature of the entries in
1466 the lang_names array, specifically that shorter names appear
1467 before their longer variants. (ie C before C++). That way
1468 when we are attempting to match --help=c for example we will
1469 match with C first and not C++. */
1470 for (i
= 0, lang_flag
= 0; i
< cl_lang_count
; i
++)
1471 if (strncasecmp (a
, lang_names
[i
], len
) == 0)
1473 lang_flag
= 1U << i
;
1477 if (specific_flag
!= 0)
1480 * pflags
|= specific_flag
;
1483 /* The option's argument matches both the start of a
1484 language name and the start of an option class name.
1485 We have a special case for when the user has
1486 specified "--help=c", but otherwise we have to issue
1488 if (strncasecmp (a
, "c", len
) == 0)
1489 * pflags
|= lang_flag
;
1492 "warning: --help argument %.*s is ambiguous, please be more specific\n",
1496 else if (lang_flag
!= 0)
1497 * pflags
|= lang_flag
;
1500 "warning: unrecognized argument to --help= option: %.*s\n",
1509 print_specific_help (include_flags
, exclude_flags
, 0);
1510 exit_after_options
= true;
1515 print_version (stderr
, "");
1516 exit_after_options
= true;
1520 g_switch_value
= value
;
1521 g_switch_set
= true;
1526 /* Currently handled in a prescan. */
1530 /* For backward compatibility, -W is the same as -Wextra. */
1535 enable_warning_as_error (arg
, value
, lang_mask
);
1542 case OPT_Wlarger_than_
:
1543 /* This form corresponds to -Wlarger-than-.
1544 Kept for backward compatibility.
1545 Don't use it as the first argument of warning(). */
1547 case OPT_Wlarger_than_eq
:
1548 larger_than_size
= value
;
1549 warn_larger_than
= value
!= -1;
1552 case OPT_Wframe_larger_than_
:
1553 frame_larger_than_size
= value
;
1554 warn_frame_larger_than
= value
!= -1;
1557 case OPT_Wstrict_aliasing
:
1558 set_Wstrict_aliasing (value
);
1561 case OPT_Wstrict_aliasing_
:
1562 warn_strict_aliasing
= value
;
1565 case OPT_Wstrict_overflow
:
1566 warn_strict_overflow
= (value
1567 ? (int) WARN_STRICT_OVERFLOW_CONDITIONAL
1571 case OPT_Wstrict_overflow_
:
1572 warn_strict_overflow
= value
;
1576 set_Wunused (value
);
1581 aux_info_file_name
= arg
;
1582 flag_gen_aux_info
= 1;
1586 aux_base_name
= arg
;
1589 case OPT_auxbase_strip
:
1591 char *tmp
= xstrdup (arg
);
1592 strip_off_ending (tmp
, strlen (tmp
));
1594 aux_base_name
= tmp
;
1599 decode_d_option (arg
);
1603 dump_base_name
= arg
;
1606 case OPT_falign_functions_
:
1607 align_functions
= value
;
1610 case OPT_falign_jumps_
:
1611 align_jumps
= value
;
1614 case OPT_falign_labels_
:
1615 align_labels
= value
;
1618 case OPT_falign_loops_
:
1619 align_loops
= value
;
1622 case OPT_fbranch_probabilities
:
1623 flag_branch_probabilities_set
= true;
1626 case OPT_fcall_used_
:
1627 fix_register (arg
, 0, 1);
1630 case OPT_fcall_saved_
:
1631 fix_register (arg
, 0, 0);
1635 dbg_cnt_process_opt (arg
);
1638 case OPT_fdbg_cnt_list
:
1639 dbg_cnt_list_all_counters ();
1642 case OPT_fdebug_prefix_map_
:
1643 add_debug_prefix_map (arg
);
1646 case OPT_fdiagnostics_show_location_
:
1647 if (!strcmp (arg
, "once"))
1648 diagnostic_prefixing_rule (global_dc
) = DIAGNOSTICS_SHOW_PREFIX_ONCE
;
1649 else if (!strcmp (arg
, "every-line"))
1650 diagnostic_prefixing_rule (global_dc
)
1651 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE
;
1656 case OPT_fdiagnostics_show_option
:
1657 global_dc
->show_option_requested
= true;
1661 if (!dump_switch_p (arg
))
1665 case OPT_ffast_math
:
1666 set_fast_math_flags (value
);
1669 case OPT_funsafe_math_optimizations
:
1670 set_unsafe_math_optimizations_flags (value
);
1674 fix_register (arg
, 1, 1);
1677 case OPT_finline_limit_
:
1678 case OPT_finline_limit_eq
:
1679 set_param_value ("max-inline-insns-single", value
/ 2);
1680 set_param_value ("max-inline-insns-auto", value
/ 2);
1683 case OPT_finstrument_functions_exclude_function_list_
:
1684 add_instrument_functions_exclude_list
1685 (&flag_instrument_functions_exclude_functions
, arg
);
1688 case OPT_finstrument_functions_exclude_file_list_
:
1689 add_instrument_functions_exclude_list
1690 (&flag_instrument_functions_exclude_files
, arg
);
1693 case OPT_fmessage_length_
:
1694 pp_set_line_maximum_length (global_dc
->printer
, value
);
1697 case OPT_fpack_struct_
:
1698 if (value
<= 0 || (value
& (value
- 1)) || value
> 16)
1699 error ("structure alignment must be a small power of two, not %d", value
);
1702 initial_max_fld_align
= value
;
1703 maximum_field_alignment
= value
* BITS_PER_UNIT
;
1707 case OPT_fpeel_loops
:
1708 flag_peel_loops_set
= true;
1711 case OPT_fprofile_arcs
:
1712 profile_arc_flag_set
= true;
1715 case OPT_finline_functions
:
1716 flag_inline_functions_set
= true;
1719 case OPT_fprofile_dir_
:
1720 profile_data_prefix
= xstrdup (arg
);
1723 case OPT_fprofile_use_
:
1724 profile_data_prefix
= xstrdup (arg
);
1725 flag_profile_use
= true;
1727 /* No break here - do -fprofile-use processing. */
1728 case OPT_fprofile_use
:
1729 if (!flag_branch_probabilities_set
)
1730 flag_branch_probabilities
= value
;
1731 if (!flag_profile_values_set
)
1732 flag_profile_values
= value
;
1733 if (!flag_unroll_loops_set
)
1734 flag_unroll_loops
= value
;
1735 if (!flag_peel_loops_set
)
1736 flag_peel_loops
= value
;
1737 if (!flag_tracer_set
)
1738 flag_tracer
= value
;
1739 if (!flag_value_profile_transformations_set
)
1740 flag_value_profile_transformations
= value
;
1741 if (!flag_inline_functions_set
)
1742 flag_inline_functions
= value
;
1745 case OPT_fprofile_generate_
:
1746 profile_data_prefix
= xstrdup (arg
);
1748 /* No break here - do -fprofile-generate processing. */
1749 case OPT_fprofile_generate
:
1750 if (!profile_arc_flag_set
)
1751 profile_arc_flag
= value
;
1752 if (!flag_profile_values_set
)
1753 flag_profile_values
= value
;
1754 if (!flag_value_profile_transformations_set
)
1755 flag_value_profile_transformations
= value
;
1756 if (!flag_inline_functions_set
)
1757 flag_inline_functions
= value
;
1760 case OPT_fprofile_values
:
1761 flag_profile_values_set
= true;
1764 case OPT_fvisibility_
:
1766 if (!strcmp(arg
, "default"))
1767 default_visibility
= VISIBILITY_DEFAULT
;
1768 else if (!strcmp(arg
, "internal"))
1769 default_visibility
= VISIBILITY_INTERNAL
;
1770 else if (!strcmp(arg
, "hidden"))
1771 default_visibility
= VISIBILITY_HIDDEN
;
1772 else if (!strcmp(arg
, "protected"))
1773 default_visibility
= VISIBILITY_PROTECTED
;
1775 error ("unrecognized visibility value \"%s\"", arg
);
1780 flag_value_profile_transformations_set
= true;
1783 case OPT_frandom_seed
:
1784 /* The real switch is -fno-random-seed. */
1787 set_random_seed (NULL
);
1790 case OPT_frandom_seed_
:
1791 set_random_seed (arg
);
1794 case OPT_fsched_verbose_
:
1795 #ifdef INSN_SCHEDULING
1796 fix_sched_param ("verbose", arg
);
1802 case OPT_fsched_stalled_insns_
:
1803 flag_sched_stalled_insns
= value
;
1804 if (flag_sched_stalled_insns
== 0)
1805 flag_sched_stalled_insns
= -1;
1808 case OPT_fsched_stalled_insns_dep_
:
1809 flag_sched_stalled_insns_dep
= value
;
1812 case OPT_fstack_limit
:
1813 /* The real switch is -fno-stack-limit. */
1816 stack_limit_rtx
= NULL_RTX
;
1819 case OPT_fstack_limit_register_
:
1821 int reg
= decode_reg_name (arg
);
1823 error ("unrecognized register name \"%s\"", arg
);
1825 stack_limit_rtx
= gen_rtx_REG (Pmode
, reg
);
1829 case OPT_fstack_limit_symbol_
:
1830 stack_limit_rtx
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (arg
));
1833 case OPT_ftree_vectorizer_verbose_
:
1834 vect_set_verbosity_level (arg
);
1837 case OPT_ftls_model_
:
1838 if (!strcmp (arg
, "global-dynamic"))
1839 flag_tls_default
= TLS_MODEL_GLOBAL_DYNAMIC
;
1840 else if (!strcmp (arg
, "local-dynamic"))
1841 flag_tls_default
= TLS_MODEL_LOCAL_DYNAMIC
;
1842 else if (!strcmp (arg
, "initial-exec"))
1843 flag_tls_default
= TLS_MODEL_INITIAL_EXEC
;
1844 else if (!strcmp (arg
, "local-exec"))
1845 flag_tls_default
= TLS_MODEL_LOCAL_EXEC
;
1847 warning (0, "unknown tls-model \"%s\"", arg
);
1851 flag_tracer_set
= true;
1854 case OPT_funroll_loops
:
1855 flag_unroll_loops_set
= true;
1859 set_debug_level (NO_DEBUG
, DEFAULT_GDB_EXTENSIONS
, arg
);
1863 set_debug_level (SDB_DEBUG
, false, arg
);
1867 set_debug_level (DWARF2_DEBUG
, false, arg
);
1871 set_debug_level (NO_DEBUG
, 2, arg
);
1876 set_debug_level (DBX_DEBUG
, code
== OPT_gstabs_
, arg
);
1880 set_debug_level (VMS_DEBUG
, false, arg
);
1885 set_debug_level (XCOFF_DEBUG
, code
== OPT_gxcoff_
, arg
);
1889 asm_file_name
= arg
;
1892 case OPT_pedantic_errors
:
1893 flag_pedantic_errors
= pedantic
= 1;
1896 case OPT_floop_optimize
:
1897 case OPT_frerun_loop_opt
:
1898 case OPT_fstrength_reduce
:
1899 case OPT_ftree_store_copy_prop
:
1900 case OPT_fforce_addr
:
1901 /* These are no-ops, preserved for backward compatibility. */
1905 /* If the flag was handled in a standard way, assume the lack of
1906 processing here is intentional. */
1907 gcc_assert (cl_options
[scode
].flag_var
);
1914 /* Handle --param NAME=VALUE. */
1916 handle_param (const char *carg
)
1921 arg
= xstrdup (carg
);
1922 equal
= strchr (arg
, '=');
1924 error ("%s: --param arguments should be of the form NAME=VALUE", arg
);
1927 value
= integral_argument (equal
+ 1);
1929 error ("invalid --param value %qs", equal
+ 1);
1933 set_param_value (arg
, value
);
1940 /* Handle -W and -Wextra. */
1942 set_Wextra (int setting
)
1944 extra_warnings
= setting
;
1945 warn_unused_parameter
= (setting
&& maybe_warn_unused_parameter
);
1947 /* We save the value of warn_uninitialized, since if they put
1948 -Wuninitialized on the command line, we need to generate a
1949 warning about not using it without also specifying -O. */
1951 warn_uninitialized
= 0;
1952 else if (warn_uninitialized
!= 1)
1953 warn_uninitialized
= 2;
1956 /* Initialize unused warning flags. */
1958 set_Wunused (int setting
)
1960 warn_unused_function
= setting
;
1961 warn_unused_label
= setting
;
1962 /* Unused function parameter warnings are reported when either
1963 ``-Wextra -Wunused'' or ``-Wunused-parameter'' is specified.
1964 Thus, if -Wextra has already been seen, set warn_unused_parameter;
1965 otherwise set maybe_warn_extra_parameter, which will be picked up
1967 maybe_warn_unused_parameter
= setting
;
1968 warn_unused_parameter
= (setting
&& extra_warnings
);
1969 warn_unused_variable
= setting
;
1970 warn_unused_value
= setting
;
1973 /* Used to set the level of strict aliasing warnings,
1974 when no level is specified (i.e., when -Wstrict-aliasing, and not
1975 -Wstrict-aliasing=level was given).
1976 ONOFF is assumed to take value 1 when -Wstrict-aliasing is specified,
1977 and 0 otherwise. After calling this function, wstrict_aliasing will be
1978 set to the default value of -Wstrict_aliasing=level, currently 3. */
1980 set_Wstrict_aliasing (int onoff
)
1982 gcc_assert (onoff
== 0 || onoff
== 1);
1984 warn_strict_aliasing
= 3;
1987 /* The following routines are useful in setting all the flags that
1988 -ffast-math and -fno-fast-math imply. */
1990 set_fast_math_flags (int set
)
1992 flag_unsafe_math_optimizations
= set
;
1993 set_unsafe_math_optimizations_flags (set
);
1994 flag_finite_math_only
= set
;
1995 flag_errno_math
= !set
;
1998 flag_signaling_nans
= 0;
1999 flag_rounding_math
= 0;
2000 flag_cx_limited_range
= 1;
2004 /* When -funsafe-math-optimizations is set the following
2005 flags are set as well. */
2007 set_unsafe_math_optimizations_flags (int set
)
2009 flag_trapping_math
= !set
;
2010 flag_signed_zeros
= !set
;
2011 flag_associative_math
= set
;
2012 flag_reciprocal_math
= set
;
2015 /* Return true iff flags are set as if -ffast-math. */
2017 fast_math_flags_set_p (void)
2019 return (!flag_trapping_math
2020 && flag_unsafe_math_optimizations
2021 && flag_finite_math_only
2022 && !flag_signed_zeros
2023 && !flag_errno_math
);
2026 /* Handle a debug output -g switch. EXTENDED is true or false to support
2027 extended output (2 is special and means "-ggdb" was given). */
2029 set_debug_level (enum debug_info_type type
, int extended
, const char *arg
)
2031 static bool type_explicit
;
2033 use_gnu_debug_info_extensions
= extended
;
2035 if (type
== NO_DEBUG
)
2037 if (write_symbols
== NO_DEBUG
)
2039 write_symbols
= PREFERRED_DEBUGGING_TYPE
;
2043 #ifdef DWARF2_DEBUGGING_INFO
2044 write_symbols
= DWARF2_DEBUG
;
2045 #elif defined DBX_DEBUGGING_INFO
2046 write_symbols
= DBX_DEBUG
;
2050 if (write_symbols
== NO_DEBUG
)
2051 warning (0, "target system does not support debug output");
2056 /* Does it conflict with an already selected type? */
2057 if (type_explicit
&& write_symbols
!= NO_DEBUG
&& type
!= write_symbols
)
2058 error ("debug format \"%s\" conflicts with prior selection",
2059 debug_type_names
[type
]);
2060 write_symbols
= type
;
2061 type_explicit
= true;
2064 /* A debug flag without a level defaults to level 2. */
2067 if (!debug_info_level
)
2068 debug_info_level
= 2;
2072 debug_info_level
= integral_argument (arg
);
2073 if (debug_info_level
== (unsigned int) -1)
2074 error ("unrecognised debug output level \"%s\"", arg
);
2075 else if (debug_info_level
> 3)
2076 error ("debug output level %s is too high", arg
);
2080 /* Return 1 if OPTION is enabled, 0 if it is disabled, or -1 if it isn't
2081 a simple on-off switch. */
2084 option_enabled (int opt_idx
)
2086 const struct cl_option
*option
= &(cl_options
[opt_idx
]);
2088 if (option
->flag_var
)
2089 switch (option
->var_type
)
2092 return *(int *) option
->flag_var
!= 0;
2095 return *(int *) option
->flag_var
== option
->var_value
;
2097 case CLVC_BIT_CLEAR
:
2098 return (*(int *) option
->flag_var
& option
->var_value
) == 0;
2101 return (*(int *) option
->flag_var
& option
->var_value
) != 0;
2109 /* Fill STATE with the current state of option OPTION. Return true if
2110 there is some state to store. */
2113 get_option_state (int option
, struct cl_option_state
*state
)
2115 if (cl_options
[option
].flag_var
== 0)
2118 switch (cl_options
[option
].var_type
)
2122 state
->data
= cl_options
[option
].flag_var
;
2123 state
->size
= sizeof (int);
2126 case CLVC_BIT_CLEAR
:
2128 state
->ch
= option_enabled (option
);
2129 state
->data
= &state
->ch
;
2134 state
->data
= *(const char **) cl_options
[option
].flag_var
;
2135 if (state
->data
== 0)
2137 state
->size
= strlen (state
->data
) + 1;
2143 /* Enable a warning option as an error. This is used by -Werror= and
2144 also by legacy Werror-implicit-function-declaration. */
2147 enable_warning_as_error (const char *arg
, int value
, unsigned int lang_mask
)
2152 new_option
= XNEWVEC (char, strlen (arg
) + 2);
2153 new_option
[0] = 'W';
2154 strcpy (new_option
+ 1, arg
);
2155 option_index
= find_opt (new_option
, lang_mask
);
2156 if (option_index
== N_OPTS
)
2158 error ("-Werror=%s: No option -%s", arg
, new_option
);
2162 int kind
= value
? DK_ERROR
: DK_WARNING
;
2163 diagnostic_classify_diagnostic (global_dc
, option_index
, kind
);
2165 /* -Werror=foo implies -Wfoo. */
2166 if (cl_options
[option_index
].var_type
== CLVC_BOOLEAN
2167 && cl_options
[option_index
].flag_var
2168 && kind
== DK_ERROR
)
2169 *(int *) cl_options
[option_index
].flag_var
= 1;