1 /* Command line option handling.
2 Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008
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
= XRESIZEVEC (const char *, in_fnames
, num_in_fnames
);
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;
825 if (!no_unit_at_a_time_default
)
827 flag_unit_at_a_time
= 1;
829 flag_toplevel_reorder
= 0;
836 flag_delayed_branch
= 1;
838 #ifdef CAN_DEBUG_WITHOUT_FP
839 flag_omit_frame_pointer
= 1;
841 flag_guess_branch_prob
= 1;
842 flag_cprop_registers
= 1;
843 flag_if_conversion
= 1;
844 flag_if_conversion2
= 1;
845 flag_ipa_pure_const
= 1;
846 flag_ipa_reference
= 1;
847 flag_split_wide_types
= 1;
854 flag_tree_copyrename
= 1;
856 flag_tree_copy_prop
= 1;
861 /* Loop header copying usually increases size of the code. This used
862 not to be true, since quite often it is possible to verify that
863 the condition is satisfied in the first iteration and therefore
864 to eliminate it. Jump threading handles these cases now. */
871 flag_inline_small_functions
= 1;
872 flag_thread_jumps
= 1;
873 flag_crossjumping
= 1;
874 flag_optimize_sibling_calls
= 1;
875 flag_forward_propagate
= 1;
876 flag_cse_follow_jumps
= 1;
878 flag_expensive_optimizations
= 1;
879 flag_rerun_cse_after_loop
= 1;
880 flag_caller_saves
= 1;
882 #ifdef INSN_SCHEDULING
883 flag_schedule_insns
= 1;
884 flag_schedule_insns_after_reload
= 1;
887 flag_strict_aliasing
= 1;
888 flag_strict_overflow
= 1;
889 flag_delete_null_pointer_checks
= 1;
890 flag_reorder_blocks
= 1;
891 flag_reorder_functions
= 1;
892 flag_tree_store_ccp
= 1;
897 /* Conditional DCE generates bigger code. */
898 flag_tree_builtin_call_dce
= 1;
899 /* PRE tends to generate bigger code. */
903 /* Allow more virtual operators to increase alias precision. */
904 set_param_value ("max-aliased-vops", 500);
909 flag_predictive_commoning
= 1;
910 flag_inline_functions
= 1;
911 flag_unswitch_loops
= 1;
912 flag_gcse_after_reload
= 1;
913 flag_tree_vectorize
= 1;
915 /* Allow even more virtual operators. */
916 set_param_value ("max-aliased-vops", 1000);
917 set_param_value ("avg-aliased-vops", 3);
920 if (optimize
< 2 || optimize_size
)
927 /* Don't reorder blocks when optimizing for size because extra
928 jump insns may be created; also barrier may create extra padding.
930 More correctly we should have a block reordering mode that tried
931 to minimize the combined size of all the jumps. This would more
932 or less automatically remove extra jumps, but would also try to
933 use more short jumps instead of long jumps. */
934 flag_reorder_blocks
= 0;
935 flag_reorder_blocks_and_partition
= 0;
940 /* Inlining of functions reducing size is a good idea regardless
941 of them being declared inline. */
942 flag_inline_functions
= 1;
944 /* We want to crossjump as much as possible. */
945 set_param_value ("min-crossjump-insns", 1);
948 /* Initialize whether `char' is signed. */
949 flag_signed_char
= DEFAULT_SIGNED_CHAR
;
950 /* Set this to a special "uninitialized" value. The actual default is set
951 after target options have been processed. */
952 flag_short_enums
= 2;
954 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
956 target_flags
= targetm
.default_target_flags
;
958 /* Some targets have ABI-specified unwind tables. */
959 flag_unwind_tables
= targetm
.unwind_tables_default
;
961 #ifdef OPTIMIZATION_OPTIONS
962 /* Allow default optimizations to be specified on a per-machine basis. */
963 OPTIMIZATION_OPTIONS (optimize
, optimize_size
);
966 handle_options (argc
, argv
, lang_mask
);
970 if (flag_pic
&& !flag_pie
)
973 if (flag_no_inline
== 2)
976 flag_really_no_inline
= flag_no_inline
;
978 /* Set flag_no_inline before the post_options () hook. The C front
979 ends use it to determine tree inlining defaults. FIXME: such
980 code should be lang-independent when all front ends use tree
981 inlining, in which case it, and this condition, should be moved
982 to the top of process_options() instead. */
985 /* Inlining does not work if not optimizing,
986 so force it not to be done. */
990 /* The c_decode_option function and decode_option hook set
991 this to `2' if -Wall is used, so we can avoid giving out
992 lots of errors for people who don't realize what -Wall does. */
993 if (warn_uninitialized
== 1)
994 warning (OPT_Wuninitialized
,
995 "-Wuninitialized is not supported without -O");
998 if (flag_really_no_inline
== 2)
999 flag_really_no_inline
= flag_no_inline
;
1001 /* Inlining of functions called just once will only work if we can look
1002 at the complete translation unit. */
1003 if (flag_inline_functions_called_once
&& !flag_unit_at_a_time
)
1005 flag_inline_functions_called_once
= 0;
1006 warning (OPT_Wdisabled_optimization
,
1007 "-funit-at-a-time is required for inlining of functions "
1008 "that are only called once");
1011 /* The optimization to partition hot and cold basic blocks into separate
1012 sections of the .o and executable files does not work (currently)
1013 with exception handling. This is because there is no support for
1014 generating unwind info. If flag_exceptions is turned on we need to
1015 turn off the partitioning optimization. */
1017 if (flag_exceptions
&& flag_reorder_blocks_and_partition
)
1020 ("-freorder-blocks-and-partition does not work with exceptions");
1021 flag_reorder_blocks_and_partition
= 0;
1022 flag_reorder_blocks
= 1;
1025 /* If user requested unwind info, then turn off the partitioning
1028 if (flag_unwind_tables
&& ! targetm
.unwind_tables_default
1029 && flag_reorder_blocks_and_partition
)
1031 inform ("-freorder-blocks-and-partition does not support unwind info");
1032 flag_reorder_blocks_and_partition
= 0;
1033 flag_reorder_blocks
= 1;
1036 /* If the target requested unwind info, then turn off the partitioning
1037 optimization with a different message. Likewise, if the target does not
1038 support named sections. */
1040 if (flag_reorder_blocks_and_partition
1041 && (!targetm
.have_named_sections
1042 || (flag_unwind_tables
&& targetm
.unwind_tables_default
)))
1045 ("-freorder-blocks-and-partition does not work on this architecture");
1046 flag_reorder_blocks_and_partition
= 0;
1047 flag_reorder_blocks
= 1;
1051 #define LEFT_COLUMN 27
1053 /* Output ITEM, of length ITEM_WIDTH, in the left column,
1054 followed by word-wrapped HELP in a second column. */
1056 wrap_help (const char *help
,
1058 unsigned int item_width
,
1059 unsigned int columns
)
1061 unsigned int col_width
= LEFT_COLUMN
;
1062 unsigned int remaining
, room
, len
;
1064 remaining
= strlen (help
);
1068 room
= columns
- 3 - MAX (col_width
, item_width
);
1077 for (i
= 0; help
[i
]; i
++)
1079 if (i
>= room
&& len
!= remaining
)
1083 else if ((help
[i
] == '-' || help
[i
] == '/')
1084 && help
[i
+ 1] != ' '
1085 && i
> 0 && ISALPHA (help
[i
- 1]))
1090 printf( " %-*.*s %.*s\n", col_width
, item_width
, item
, len
, help
);
1092 while (help
[len
] == ' ')
1100 /* Print help for a specific front-end, etc. */
1102 print_filtered_help (unsigned int include_flags
,
1103 unsigned int exclude_flags
,
1104 unsigned int any_flags
,
1105 unsigned int columns
)
1109 static char *printed
= NULL
;
1111 bool displayed
= false;
1113 if (include_flags
== CL_PARAMS
)
1115 for (i
= 0; i
< LAST_PARAM
; i
++)
1117 const char *param
= compiler_params
[i
].option
;
1119 help
= compiler_params
[i
].help
;
1120 if (help
== NULL
|| *help
== '\0')
1122 if (exclude_flags
& CL_UNDOCUMENTED
)
1124 help
= undocumented_msg
;
1127 /* Get the translation. */
1130 wrap_help (help
, param
, strlen (param
), columns
);
1137 printed
= XCNEWVAR (char, cl_options_count
);
1139 for (i
= 0; i
< cl_options_count
; i
++)
1141 static char new_help
[128];
1142 const struct cl_option
*option
= cl_options
+ i
;
1147 if (include_flags
== 0
1148 || ((option
->flags
& include_flags
) != include_flags
))
1150 if ((option
->flags
& any_flags
) == 0)
1154 /* Skip unwanted switches. */
1155 if ((option
->flags
& exclude_flags
) != 0)
1159 /* Skip switches that have already been printed. */
1165 help
= option
->help
;
1168 if (exclude_flags
& CL_UNDOCUMENTED
)
1170 help
= undocumented_msg
;
1173 /* Get the translation. */
1176 /* Find the gap between the name of the
1177 option and its descriptive text. */
1178 tab
= strchr (help
, '\t');
1187 opt
= option
->opt_text
;
1191 /* With the -Q option enabled we change the descriptive text associated
1192 with an option to be an indication of its current setting. */
1195 if (len
< (LEFT_COLUMN
+ 2))
1196 strcpy (new_help
, "\t\t");
1198 strcpy (new_help
, "\t");
1200 if (option
->flag_var
!= NULL
)
1202 if (option
->flags
& CL_JOINED
)
1204 if (option
->var_type
== CLVC_STRING
)
1206 if (* (const char **) option
->flag_var
!= NULL
)
1207 snprintf (new_help
+ strlen (new_help
),
1208 sizeof (new_help
) - strlen (new_help
),
1209 * (const char **) option
->flag_var
);
1212 sprintf (new_help
+ strlen (new_help
),
1213 "%#x", * (int *) option
->flag_var
);
1216 strcat (new_help
, option_enabled (i
)
1217 ? _("[enabled]") : _("[disabled]"));
1223 wrap_help (help
, opt
, len
, columns
);
1229 unsigned int langs
= include_flags
& CL_LANG_ALL
;
1232 printf (_(" No options with the desired characteristics were found\n"));
1237 /* PR 31349: Tell the user how to see all of the
1238 options supported by a specific front end. */
1239 for (i
= 0; (1U << i
) < CL_LANG_ALL
; i
++)
1240 if ((1U << i
) & langs
)
1241 printf (_(" None found. Use --help=%s to show *all* the options supported by the %s front-end\n"),
1242 lang_names
[i
], lang_names
[i
]);
1246 else if (! displayed
)
1247 printf (_(" All options with the desired characteristics have already been displayed\n"));
1252 /* Display help for a specified type of option.
1253 The options must have ALL of the INCLUDE_FLAGS set
1254 ANY of the flags in the ANY_FLAGS set
1255 and NONE of the EXCLUDE_FLAGS set. */
1257 print_specific_help (unsigned int include_flags
,
1258 unsigned int exclude_flags
,
1259 unsigned int any_flags
)
1261 unsigned int all_langs_mask
= (1U << cl_lang_count
) - 1;
1262 const char * description
= NULL
;
1263 const char * descrip_extra
= "";
1266 static unsigned int columns
= 0;
1268 /* Sanity check: Make sure that we do not have more
1269 languages than we have bits available to enumerate them. */
1270 gcc_assert ((1U << cl_lang_count
) < CL_MIN_OPTION_CLASS
);
1272 /* If we have not done so already, obtain
1273 the desired maximum width of the output. */
1278 GET_ENVIRONMENT (p
, "COLUMNS");
1281 int value
= atoi (p
);
1288 /* Use a reasonable default. */
1292 /* Decide upon the title for the options that we are going to display. */
1293 for (i
= 0, flag
= 1; flag
<= CL_MAX_OPTION_CLASS
; flag
<<= 1, i
++)
1295 switch (flag
& include_flags
)
1301 description
= _("The following options are target specific");
1304 description
= _("The following options control compiler warning messages");
1306 case CL_OPTIMIZATION
:
1307 description
= _("The following options control optimizations");
1310 description
= _("The following options are language-independent");
1313 description
= _("The --param option recognizes the following as parameters");
1316 if (i
>= cl_lang_count
)
1318 if ((exclude_flags
& ((1U << cl_lang_count
) - 1)) != 0)
1319 description
= _("The following options are specific to just the language ");
1321 description
= _("The following options are supported by the language ");
1322 descrip_extra
= lang_names
[i
];
1327 if (description
== NULL
)
1331 if (include_flags
== CL_UNDOCUMENTED
)
1332 description
= _("The following options are not documented");
1335 internal_error ("unrecognized include_flags 0x%x passed to print_specific_help",
1342 if (any_flags
& all_langs_mask
)
1343 description
= _("The following options are language-related");
1345 description
= _("The following options are language-independent");
1349 printf ("%s%s:\n", description
, descrip_extra
);
1350 print_filtered_help (include_flags
, exclude_flags
, any_flags
, columns
);
1353 /* Handle target- and language-independent options. Return zero to
1354 generate an "unknown option" message. Only options that need
1355 extra handling need to be listed here; if you simply want
1356 VALUE assigned to a variable, it happens automatically. */
1359 common_handle_option (size_t scode
, const char *arg
, int value
,
1360 unsigned int lang_mask
)
1362 static bool verbose
= false;
1363 enum opt_code code
= (enum opt_code
) scode
;
1378 unsigned int all_langs_mask
= (1U << cl_lang_count
) - 1;
1379 unsigned int undoc_mask
;
1382 undoc_mask
= (verbose
| extra_warnings
) ? 0 : CL_UNDOCUMENTED
;
1383 /* First display any single language specific options. */
1384 for (i
= 0; i
< cl_lang_count
; i
++)
1386 (1U << i
, (all_langs_mask
& (~ (1U << i
))) | undoc_mask
, 0);
1387 /* Next display any multi language specific options. */
1388 print_specific_help (0, undoc_mask
, all_langs_mask
);
1389 /* Then display any remaining, non-language options. */
1390 for (i
= CL_MIN_OPTION_CLASS
; i
<= CL_MAX_OPTION_CLASS
; i
<<= 1)
1391 print_specific_help (i
, undoc_mask
, 0);
1392 exit_after_options
= true;
1396 case OPT_ftarget_help
:
1397 case OPT__target_help
:
1398 print_specific_help (CL_TARGET
, CL_UNDOCUMENTED
, 0);
1399 exit_after_options
= true;
1401 /* Allow the target a chance to give the user some additional information. */
1402 if (targetm
.target_help
)
1403 targetm
.target_help ();
1409 const char * a
= arg
;
1410 unsigned int include_flags
= 0;
1411 /* Note - by default we include undocumented options when listing
1412 specific classes. If you only want to see documented options
1413 then add ",^undocumented" to the --help= option. E.g.:
1415 --help=target,^undocumented */
1416 unsigned int exclude_flags
= 0;
1418 /* Walk along the argument string, parsing each word in turn.
1420 arg = [^]{word}[,{arg}]
1421 word = {optimizers|target|warnings|undocumented|
1422 params|common|<language>} */
1427 const char * string
;
1432 { "optimizers", CL_OPTIMIZATION
},
1433 { "target", CL_TARGET
},
1434 { "warnings", CL_WARNING
},
1435 { "undocumented", CL_UNDOCUMENTED
},
1436 { "params", CL_PARAMS
},
1437 { "joined", CL_JOINED
},
1438 { "separate", CL_SEPARATE
},
1439 { "common", CL_COMMON
},
1442 unsigned int * pflags
;
1444 unsigned int lang_flag
, specific_flag
;
1451 pflags
= & exclude_flags
;
1454 pflags
= & include_flags
;
1456 comma
= strchr (a
, ',');
1462 /* Check to see if the string matches an option class name. */
1463 for (i
= 0, specific_flag
= 0; specifics
[i
].string
!= NULL
; i
++)
1464 if (strncasecmp (a
, specifics
[i
].string
, len
) == 0)
1466 specific_flag
= specifics
[i
].flag
;
1470 /* Check to see if the string matches a language name.
1471 Note - we rely upon the alpha-sorted nature of the entries in
1472 the lang_names array, specifically that shorter names appear
1473 before their longer variants. (i.e. C before C++). That way
1474 when we are attempting to match --help=c for example we will
1475 match with C first and not C++. */
1476 for (i
= 0, lang_flag
= 0; i
< cl_lang_count
; i
++)
1477 if (strncasecmp (a
, lang_names
[i
], len
) == 0)
1479 lang_flag
= 1U << i
;
1483 if (specific_flag
!= 0)
1486 * pflags
|= specific_flag
;
1489 /* The option's argument matches both the start of a
1490 language name and the start of an option class name.
1491 We have a special case for when the user has
1492 specified "--help=c", but otherwise we have to issue
1494 if (strncasecmp (a
, "c", len
) == 0)
1495 * pflags
|= lang_flag
;
1498 "warning: --help argument %.*s is ambiguous, please be more specific\n",
1502 else if (lang_flag
!= 0)
1503 * pflags
|= lang_flag
;
1506 "warning: unrecognized argument to --help= option: %.*s\n",
1515 print_specific_help (include_flags
, exclude_flags
, 0);
1516 exit_after_options
= true;
1521 print_version (stderr
, "");
1522 exit_after_options
= true;
1526 g_switch_value
= value
;
1527 g_switch_set
= true;
1532 /* Currently handled in a prescan. */
1536 /* For backward compatibility, -W is the same as -Wextra. */
1541 enable_warning_as_error (arg
, value
, lang_mask
);
1548 case OPT_Wlarger_than_
:
1549 /* This form corresponds to -Wlarger-than-.
1550 Kept for backward compatibility.
1551 Don't use it as the first argument of warning(). */
1553 case OPT_Wlarger_than_eq
:
1554 larger_than_size
= value
;
1555 warn_larger_than
= value
!= -1;
1558 case OPT_Wframe_larger_than_
:
1559 frame_larger_than_size
= value
;
1560 warn_frame_larger_than
= value
!= -1;
1563 case OPT_Wstrict_aliasing
:
1564 set_Wstrict_aliasing (value
);
1567 case OPT_Wstrict_aliasing_
:
1568 warn_strict_aliasing
= value
;
1571 case OPT_Wstrict_overflow
:
1572 warn_strict_overflow
= (value
1573 ? (int) WARN_STRICT_OVERFLOW_CONDITIONAL
1577 case OPT_Wstrict_overflow_
:
1578 warn_strict_overflow
= value
;
1582 set_Wunused (value
);
1587 aux_info_file_name
= arg
;
1588 flag_gen_aux_info
= 1;
1592 aux_base_name
= arg
;
1595 case OPT_auxbase_strip
:
1597 char *tmp
= xstrdup (arg
);
1598 strip_off_ending (tmp
, strlen (tmp
));
1600 aux_base_name
= tmp
;
1605 decode_d_option (arg
);
1609 dump_base_name
= arg
;
1612 case OPT_falign_functions_
:
1613 align_functions
= value
;
1616 case OPT_falign_jumps_
:
1617 align_jumps
= value
;
1620 case OPT_falign_labels_
:
1621 align_labels
= value
;
1624 case OPT_falign_loops_
:
1625 align_loops
= value
;
1628 case OPT_fbranch_probabilities
:
1629 flag_branch_probabilities_set
= true;
1632 case OPT_fcall_used_
:
1633 fix_register (arg
, 0, 1);
1636 case OPT_fcall_saved_
:
1637 fix_register (arg
, 0, 0);
1641 dbg_cnt_process_opt (arg
);
1644 case OPT_fdbg_cnt_list
:
1645 dbg_cnt_list_all_counters ();
1648 case OPT_fdebug_prefix_map_
:
1649 add_debug_prefix_map (arg
);
1652 case OPT_fdiagnostics_show_location_
:
1653 if (!strcmp (arg
, "once"))
1654 diagnostic_prefixing_rule (global_dc
) = DIAGNOSTICS_SHOW_PREFIX_ONCE
;
1655 else if (!strcmp (arg
, "every-line"))
1656 diagnostic_prefixing_rule (global_dc
)
1657 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE
;
1662 case OPT_fdiagnostics_show_option
:
1663 global_dc
->show_option_requested
= true;
1667 if (!dump_switch_p (arg
))
1671 case OPT_ffast_math
:
1672 set_fast_math_flags (value
);
1675 case OPT_funsafe_math_optimizations
:
1676 set_unsafe_math_optimizations_flags (value
);
1680 fix_register (arg
, 1, 1);
1683 case OPT_finline_limit_
:
1684 case OPT_finline_limit_eq
:
1685 set_param_value ("max-inline-insns-single", value
/ 2);
1686 set_param_value ("max-inline-insns-auto", value
/ 2);
1689 case OPT_finstrument_functions_exclude_function_list_
:
1690 add_instrument_functions_exclude_list
1691 (&flag_instrument_functions_exclude_functions
, arg
);
1694 case OPT_finstrument_functions_exclude_file_list_
:
1695 add_instrument_functions_exclude_list
1696 (&flag_instrument_functions_exclude_files
, arg
);
1699 case OPT_fmessage_length_
:
1700 pp_set_line_maximum_length (global_dc
->printer
, value
);
1703 case OPT_fpack_struct_
:
1704 if (value
<= 0 || (value
& (value
- 1)) || value
> 16)
1705 error ("structure alignment must be a small power of two, not %d", value
);
1708 initial_max_fld_align
= value
;
1709 maximum_field_alignment
= value
* BITS_PER_UNIT
;
1713 case OPT_fpeel_loops
:
1714 flag_peel_loops_set
= true;
1717 case OPT_fprofile_arcs
:
1718 profile_arc_flag_set
= true;
1721 case OPT_finline_functions
:
1722 flag_inline_functions_set
= true;
1725 case OPT_fprofile_dir_
:
1726 profile_data_prefix
= xstrdup (arg
);
1729 case OPT_fprofile_use_
:
1730 profile_data_prefix
= xstrdup (arg
);
1731 flag_profile_use
= true;
1733 /* No break here - do -fprofile-use processing. */
1734 case OPT_fprofile_use
:
1735 if (!flag_branch_probabilities_set
)
1736 flag_branch_probabilities
= value
;
1737 if (!flag_profile_values_set
)
1738 flag_profile_values
= value
;
1739 if (!flag_unroll_loops_set
)
1740 flag_unroll_loops
= value
;
1741 if (!flag_peel_loops_set
)
1742 flag_peel_loops
= value
;
1743 if (!flag_tracer_set
)
1744 flag_tracer
= value
;
1745 if (!flag_value_profile_transformations_set
)
1746 flag_value_profile_transformations
= value
;
1747 if (!flag_inline_functions_set
)
1748 flag_inline_functions
= value
;
1751 case OPT_fprofile_generate_
:
1752 profile_data_prefix
= xstrdup (arg
);
1754 /* No break here - do -fprofile-generate processing. */
1755 case OPT_fprofile_generate
:
1756 if (!profile_arc_flag_set
)
1757 profile_arc_flag
= value
;
1758 if (!flag_profile_values_set
)
1759 flag_profile_values
= value
;
1760 if (!flag_value_profile_transformations_set
)
1761 flag_value_profile_transformations
= value
;
1762 if (!flag_inline_functions_set
)
1763 flag_inline_functions
= value
;
1766 case OPT_fprofile_values
:
1767 flag_profile_values_set
= true;
1770 case OPT_fvisibility_
:
1772 if (!strcmp(arg
, "default"))
1773 default_visibility
= VISIBILITY_DEFAULT
;
1774 else if (!strcmp(arg
, "internal"))
1775 default_visibility
= VISIBILITY_INTERNAL
;
1776 else if (!strcmp(arg
, "hidden"))
1777 default_visibility
= VISIBILITY_HIDDEN
;
1778 else if (!strcmp(arg
, "protected"))
1779 default_visibility
= VISIBILITY_PROTECTED
;
1781 error ("unrecognized visibility value \"%s\"", arg
);
1786 flag_value_profile_transformations_set
= true;
1789 case OPT_frandom_seed
:
1790 /* The real switch is -fno-random-seed. */
1793 set_random_seed (NULL
);
1796 case OPT_frandom_seed_
:
1797 set_random_seed (arg
);
1800 case OPT_fsched_verbose_
:
1801 #ifdef INSN_SCHEDULING
1802 fix_sched_param ("verbose", arg
);
1808 case OPT_fsched_stalled_insns_
:
1809 flag_sched_stalled_insns
= value
;
1810 if (flag_sched_stalled_insns
== 0)
1811 flag_sched_stalled_insns
= -1;
1814 case OPT_fsched_stalled_insns_dep_
:
1815 flag_sched_stalled_insns_dep
= value
;
1818 case OPT_fstack_limit
:
1819 /* The real switch is -fno-stack-limit. */
1822 stack_limit_rtx
= NULL_RTX
;
1825 case OPT_fstack_limit_register_
:
1827 int reg
= decode_reg_name (arg
);
1829 error ("unrecognized register name \"%s\"", arg
);
1831 stack_limit_rtx
= gen_rtx_REG (Pmode
, reg
);
1835 case OPT_fstack_limit_symbol_
:
1836 stack_limit_rtx
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (arg
));
1839 case OPT_ftree_vectorizer_verbose_
:
1840 vect_set_verbosity_level (arg
);
1843 case OPT_ftls_model_
:
1844 if (!strcmp (arg
, "global-dynamic"))
1845 flag_tls_default
= TLS_MODEL_GLOBAL_DYNAMIC
;
1846 else if (!strcmp (arg
, "local-dynamic"))
1847 flag_tls_default
= TLS_MODEL_LOCAL_DYNAMIC
;
1848 else if (!strcmp (arg
, "initial-exec"))
1849 flag_tls_default
= TLS_MODEL_INITIAL_EXEC
;
1850 else if (!strcmp (arg
, "local-exec"))
1851 flag_tls_default
= TLS_MODEL_LOCAL_EXEC
;
1853 warning (0, "unknown tls-model \"%s\"", arg
);
1857 flag_tracer_set
= true;
1860 case OPT_funroll_loops
:
1861 flag_unroll_loops_set
= true;
1865 set_debug_level (NO_DEBUG
, DEFAULT_GDB_EXTENSIONS
, arg
);
1869 set_debug_level (SDB_DEBUG
, false, arg
);
1873 set_debug_level (DWARF2_DEBUG
, false, arg
);
1877 set_debug_level (NO_DEBUG
, 2, arg
);
1882 set_debug_level (DBX_DEBUG
, code
== OPT_gstabs_
, arg
);
1886 set_debug_level (VMS_DEBUG
, false, arg
);
1891 set_debug_level (XCOFF_DEBUG
, code
== OPT_gxcoff_
, arg
);
1895 asm_file_name
= arg
;
1898 case OPT_pedantic_errors
:
1899 flag_pedantic_errors
= pedantic
= 1;
1902 case OPT_floop_optimize
:
1903 case OPT_frerun_loop_opt
:
1904 case OPT_fstrength_reduce
:
1905 case OPT_ftree_store_copy_prop
:
1906 case OPT_fforce_addr
:
1907 case OPT_ftree_salias
:
1908 /* These are no-ops, preserved for backward compatibility. */
1912 /* If the flag was handled in a standard way, assume the lack of
1913 processing here is intentional. */
1914 gcc_assert (cl_options
[scode
].flag_var
);
1921 /* Handle --param NAME=VALUE. */
1923 handle_param (const char *carg
)
1928 arg
= xstrdup (carg
);
1929 equal
= strchr (arg
, '=');
1931 error ("%s: --param arguments should be of the form NAME=VALUE", arg
);
1934 value
= integral_argument (equal
+ 1);
1936 error ("invalid --param value %qs", equal
+ 1);
1940 set_param_value (arg
, value
);
1947 /* Handle -W and -Wextra. */
1949 set_Wextra (int setting
)
1951 extra_warnings
= setting
;
1952 warn_unused_parameter
= (setting
&& maybe_warn_unused_parameter
);
1954 /* We save the value of warn_uninitialized, since if they put
1955 -Wuninitialized on the command line, we need to generate a
1956 warning about not using it without also specifying -O. */
1958 warn_uninitialized
= 0;
1959 else if (warn_uninitialized
!= 1)
1960 warn_uninitialized
= 2;
1963 /* Initialize unused warning flags. */
1965 set_Wunused (int setting
)
1967 warn_unused_function
= setting
;
1968 warn_unused_label
= setting
;
1969 /* Unused function parameter warnings are reported when either
1970 ``-Wextra -Wunused'' or ``-Wunused-parameter'' is specified.
1971 Thus, if -Wextra has already been seen, set warn_unused_parameter;
1972 otherwise set maybe_warn_extra_parameter, which will be picked up
1974 maybe_warn_unused_parameter
= setting
;
1975 warn_unused_parameter
= (setting
&& extra_warnings
);
1976 warn_unused_variable
= setting
;
1977 warn_unused_value
= setting
;
1980 /* Used to set the level of strict aliasing warnings,
1981 when no level is specified (i.e., when -Wstrict-aliasing, and not
1982 -Wstrict-aliasing=level was given).
1983 ONOFF is assumed to take value 1 when -Wstrict-aliasing is specified,
1984 and 0 otherwise. After calling this function, wstrict_aliasing will be
1985 set to the default value of -Wstrict_aliasing=level, currently 3. */
1987 set_Wstrict_aliasing (int onoff
)
1989 gcc_assert (onoff
== 0 || onoff
== 1);
1991 warn_strict_aliasing
= 3;
1993 warn_strict_aliasing
= 0;
1996 /* The following routines are useful in setting all the flags that
1997 -ffast-math and -fno-fast-math imply. */
1999 set_fast_math_flags (int set
)
2001 flag_unsafe_math_optimizations
= set
;
2002 set_unsafe_math_optimizations_flags (set
);
2003 flag_finite_math_only
= set
;
2004 flag_errno_math
= !set
;
2007 flag_signaling_nans
= 0;
2008 flag_rounding_math
= 0;
2009 flag_cx_limited_range
= 1;
2013 /* When -funsafe-math-optimizations is set the following
2014 flags are set as well. */
2016 set_unsafe_math_optimizations_flags (int set
)
2018 flag_trapping_math
= !set
;
2019 flag_signed_zeros
= !set
;
2020 flag_associative_math
= set
;
2021 flag_reciprocal_math
= set
;
2024 /* Return true iff flags are set as if -ffast-math. */
2026 fast_math_flags_set_p (void)
2028 return (!flag_trapping_math
2029 && flag_unsafe_math_optimizations
2030 && flag_finite_math_only
2031 && !flag_signed_zeros
2032 && !flag_errno_math
);
2035 /* Handle a debug output -g switch. EXTENDED is true or false to support
2036 extended output (2 is special and means "-ggdb" was given). */
2038 set_debug_level (enum debug_info_type type
, int extended
, const char *arg
)
2040 static bool type_explicit
;
2042 use_gnu_debug_info_extensions
= extended
;
2044 if (type
== NO_DEBUG
)
2046 if (write_symbols
== NO_DEBUG
)
2048 write_symbols
= PREFERRED_DEBUGGING_TYPE
;
2052 #ifdef DWARF2_DEBUGGING_INFO
2053 write_symbols
= DWARF2_DEBUG
;
2054 #elif defined DBX_DEBUGGING_INFO
2055 write_symbols
= DBX_DEBUG
;
2059 if (write_symbols
== NO_DEBUG
)
2060 warning (0, "target system does not support debug output");
2065 /* Does it conflict with an already selected type? */
2066 if (type_explicit
&& write_symbols
!= NO_DEBUG
&& type
!= write_symbols
)
2067 error ("debug format \"%s\" conflicts with prior selection",
2068 debug_type_names
[type
]);
2069 write_symbols
= type
;
2070 type_explicit
= true;
2073 /* A debug flag without a level defaults to level 2. */
2076 if (!debug_info_level
)
2077 debug_info_level
= 2;
2081 debug_info_level
= integral_argument (arg
);
2082 if (debug_info_level
== (unsigned int) -1)
2083 error ("unrecognised debug output level \"%s\"", arg
);
2084 else if (debug_info_level
> 3)
2085 error ("debug output level %s is too high", arg
);
2089 /* Return 1 if OPTION is enabled, 0 if it is disabled, or -1 if it isn't
2090 a simple on-off switch. */
2093 option_enabled (int opt_idx
)
2095 const struct cl_option
*option
= &(cl_options
[opt_idx
]);
2097 if (option
->flag_var
)
2098 switch (option
->var_type
)
2101 return *(int *) option
->flag_var
!= 0;
2104 return *(int *) option
->flag_var
== option
->var_value
;
2106 case CLVC_BIT_CLEAR
:
2107 return (*(int *) option
->flag_var
& option
->var_value
) == 0;
2110 return (*(int *) option
->flag_var
& option
->var_value
) != 0;
2118 /* Fill STATE with the current state of option OPTION. Return true if
2119 there is some state to store. */
2122 get_option_state (int option
, struct cl_option_state
*state
)
2124 if (cl_options
[option
].flag_var
== 0)
2127 switch (cl_options
[option
].var_type
)
2131 state
->data
= cl_options
[option
].flag_var
;
2132 state
->size
= sizeof (int);
2135 case CLVC_BIT_CLEAR
:
2137 state
->ch
= option_enabled (option
);
2138 state
->data
= &state
->ch
;
2143 state
->data
= *(const char **) cl_options
[option
].flag_var
;
2144 if (state
->data
== 0)
2146 state
->size
= strlen ((const char *) state
->data
) + 1;
2152 /* Enable a warning option as an error. This is used by -Werror= and
2153 also by legacy Werror-implicit-function-declaration. */
2156 enable_warning_as_error (const char *arg
, int value
, unsigned int lang_mask
)
2161 new_option
= XNEWVEC (char, strlen (arg
) + 2);
2162 new_option
[0] = 'W';
2163 strcpy (new_option
+ 1, arg
);
2164 option_index
= find_opt (new_option
, lang_mask
);
2165 if (option_index
== N_OPTS
)
2167 error ("-Werror=%s: No option -%s", arg
, new_option
);
2171 int kind
= value
? DK_ERROR
: DK_WARNING
;
2172 diagnostic_classify_diagnostic (global_dc
, option_index
, kind
);
2174 /* -Werror=foo implies -Wfoo. */
2175 if (cl_options
[option_index
].var_type
== CLVC_BOOLEAN
2176 && cl_options
[option_index
].flag_var
2177 && kind
== DK_ERROR
)
2178 *(int *) cl_options
[option_index
].flag_var
= 1;