1 ; Options for the C, ObjC, C++ and ObjC++ front ends.
2 ; Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010,
3 ; 2011 Free Software Foundation, Inc.
5 ; This file is part of GCC.
7 ; GCC is free software; you can redistribute it and/or modify it under
8 ; the terms of the GNU General Public License as published by the Free
9 ; Software Foundation; either version 3, or (at your option) any later
12 ; GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 ; WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 ; FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 ; You should have received a copy of the GNU General Public License
18 ; along with GCC; see the file COPYING3. If not see
19 ; <http://www.gnu.org/licenses/>.
21 ; See the GCC internals manual for a description of this file's format.
23 ; Please try to keep this file in ASCII collating order.
38 C ObjC C++ ObjC++ Warning Alias(Wall)
41 C ObjC C++ ObjC++ Alias(ansi)
44 C ObjC C++ ObjC++ Separate Alias(A) MissingArgError(assertion missing after %qs)
47 C ObjC C++ ObjC++ Joined Alias(A) MissingArgError(assertion missing after %qs)
50 C ObjC C++ ObjC++ Alias(C)
53 C ObjC C++ ObjC++ Alias(CC)
56 C ObjC C++ ObjC++ Separate Alias(D) MissingArgError(macro name missing after %qs)
59 C ObjC C++ ObjC++ Joined Alias(D) MissingArgError(macro name missing after %qs)
62 C ObjC C++ ObjC++ Alias(M)
65 C ObjC C++ ObjC++ Separate Alias(d)
68 C ObjC C++ ObjC++ Joined Alias(d)
71 C ObjC C++ ObjC++ Separate Alias(imacros) MissingArgError(missing filename after %qs)
74 C ObjC C++ ObjC++ Joined Alias(imacros) MissingArgError(missing filename after %qs)
77 C ObjC C++ ObjC++ Separate Alias(include) MissingArgError(missing filename after %qs)
80 C ObjC C++ ObjC++ Joined Alias(include) MissingArgError(missing filename after %qs)
83 C ObjC C++ ObjC++ Alias(I, -)
86 C ObjC C++ ObjC++ Separate Alias(I) MissingArgError(missing path after %qs)
89 C ObjC C++ ObjC++ Joined Alias(I) MissingArgError(missing path after %qs)
91 -include-directory-after
92 C ObjC C++ ObjC++ Separate Alias(idirafter) MissingArgError(missing path after %qs)
94 -include-directory-after=
95 C ObjC C++ ObjC++ Joined Alias(idirafter) MissingArgError(missing path after %qs)
98 C ObjC C++ ObjC++ Separate Alias(iprefix)
101 C ObjC C++ ObjC++ JoinedOrMissing Alias(iprefix)
104 C ObjC C++ ObjC++ Separate Alias(iwithprefix)
106 -include-with-prefix=
107 C ObjC C++ ObjC++ JoinedOrMissing Alias(iwithprefix)
109 -include-with-prefix-after
110 C ObjC C++ ObjC++ Separate Alias(iwithprefix)
112 -include-with-prefix-after=
113 C ObjC C++ ObjC++ JoinedOrMissing Alias(iwithprefix)
115 -include-with-prefix-before
116 C ObjC C++ ObjC++ Separate Alias(iwithprefixbefore)
118 -include-with-prefix-before=
119 C ObjC C++ ObjC++ JoinedOrMissing Alias(iwithprefixbefore)
122 Driver Alias(no-integrated-cpp)
125 C ObjC C++ ObjC++ Alias(P)
127 -no-standard-includes
128 C ObjC C++ ObjC++ Alias(nostdinc)
131 C ObjC C++ ObjC++ Alias(w)
134 C ObjC C++ ObjC++ Separate Alias(o)
137 C ObjC C++ ObjC++ Joined Alias(o)
140 C ObjC C++ ObjC++ Joined Separate
143 C ObjC C++ ObjC++ Alias(pedantic)
146 C ObjC C++ ObjC++ Alias(pedantic-errors)
149 C ObjC C++ ObjC++ Undocumented Alias(E)
151 -print-missing-file-dependencies
152 C ObjC C++ ObjC++ Alias(MG)
155 C ObjC C++ ObjC++ Alias(H)
158 Driver Alias(traditional)
161 C ObjC C++ ObjC++ Alias(traditional-cpp)
164 C ObjC C++ ObjC++ Alias(trigraphs)
167 C ObjC C++ ObjC++ Separate Alias(U) MissingArgError(macro name missing after %qs)
170 C ObjC C++ ObjC++ Joined Alias(U) MissingArgError(macro name missing after %qs)
173 C ObjC C++ ObjC++ Alias(MM)
176 Common C ObjC C++ ObjC++ Alias(v)
179 C ObjC C++ ObjC++ NoDriverArg Separate Alias(MD) MissingArgError(missing filename after %qs)
181 -write-user-dependencies
182 C ObjC C++ ObjC++ NoDriverArg Separate Alias(MMD) MissingArgError(missing filename after %qs)
185 C ObjC C++ ObjC++ Joined Separate MissingArgError(assertion missing after %qs)
186 -A<question>=<answer> Assert the <answer> to <question>. Putting '-' before <question> disables the <answer> to <question>
190 Do not discard comments
194 Do not discard comments in macro expansions
197 C ObjC C++ ObjC++ Joined Separate MissingArgError(macro name missing after %qs)
198 -D<macro>[=<val>] Define a <macro> with <val> as its value. If just <macro> is given, <val> is taken to be 1
201 C ObjC C++ ObjC++ Undocumented Var(flag_preprocess_only)
204 Driver C ObjC C++ ObjC++ Joined Separate MissingArgError(missing path after %qs)
205 -F <dir> Add <dir> to the end of the main framework include path
209 Print the name of header files as they are used
212 C ObjC C++ ObjC++ Joined Separate MissingArgError(missing path after %qs)
213 -I <dir> Add <dir> to the end of the main include path
217 Generate make dependencies
220 C ObjC C++ ObjC++ NoDriverArg Separate MissingArgError(missing filename after %qs)
221 Generate make dependencies and compile
224 C ObjC C++ ObjC++ Joined Separate MissingArgError(missing filename after %qs)
225 -MF <file> Write dependency output to the given file
229 Treat missing header files as generated files
233 Like -M but ignore system header files
236 C ObjC C++ ObjC++ NoDriverArg Separate MissingArgError(missing filename after %qs)
237 Like -MD but ignore system header files
241 Generate phony targets for all headers
244 C ObjC C++ ObjC++ Joined Separate MissingArgError(missing makefile target after %qs)
245 -MQ <target> Add a MAKE-quoted target
248 C ObjC C++ ObjC++ Joined Separate MissingArgError(missing makefile target after %qs)
249 -MT <target> Add an unquoted target
253 Do not generate #line directives
256 C ObjC C++ ObjC++ Joined Separate MissingArgError(macro name missing after %qs)
257 -U<macro> Undefine <macro>
260 C ObjC C++ ObjC++ LTO Var(warn_abi) Warning
261 Warn about things that will change when compiling with an ABI-compliant compiler
264 C ObjC C++ ObjC++ LTO Var(warn_psabi) Init(1) Undocumented
267 C ObjC C++ ObjC++ Var(warn_address) Warning
268 Warn about suspicious uses of memory addresses
271 C ObjC C++ ObjC++ Warning
272 Enable most warning messages
275 ObjC ObjC++ Var(warn_assign_intercept) Warning
276 Warn whenever an Objective-C assignment is being intercepted by the garbage collector
279 C ObjC Var(warn_bad_function_cast) Warning
280 Warn about casting functions to incompatible types
282 Wbuiltin-macro-redefined
283 C ObjC C++ ObjC++ Warning
284 Warn when a built-in preprocessor macro is undefined or redefined
287 C ObjC Var(warn_cxx_compat) Warning
288 Warn about C constructs that are not in the common subset of C and C++
291 C++ ObjC++ Var(warn_cxx0x_compat) Warning
292 Warn about C++ constructs whose meaning differs between ISO C++ 1998 and ISO C++ 200x
295 C ObjC C++ ObjC++ Var(warn_cast_qual) Warning
296 Warn about casts which discard qualifiers
299 C ObjC C++ ObjC++ Var(warn_char_subscripts) Warning
300 Warn about subscripts whose type is \"char\"
303 C ObjC C++ ObjC++ Var(warn_clobbered) Init(-1) Warning
304 Warn about variables that might be changed by \"longjmp\" or \"vfork\"
307 C ObjC C++ ObjC++ Warning
308 Warn about possibly nested block comments, and C++ comments spanning more than one physical line
311 C ObjC C++ ObjC++ Warning Alias(Wcomment)
312 Synonym for -Wcomment
315 C ObjC C++ ObjC++ Var(warn_conversion) Warning
316 Warn for implicit type conversions that may change a value
319 C++ ObjC++ Var(warn_conversion_null) Init(1) Warning
320 Warn for converting NULL from/to a non-pointer type
323 C ObjC C++ ObjC++ Var(warn_sign_conversion) Init(-1)
324 Warn for implicit type conversions between signed and unsigned integers
327 C++ ObjC++ Var(warn_ctor_dtor_privacy) Warning
328 Warn when all constructors and destructors are private
330 Wdeclaration-after-statement
331 C ObjC Var(warn_declaration_after_statement) Warning
332 Warn when a declaration is found after a statement
335 C C++ ObjC ObjC++ Var(warn_deprecated) Init(1) Warning
336 Warn if a deprecated compiler feature, class, method, or field is used
339 C ObjC C++ ObjC++ Var(warn_div_by_zero) Init(1) Warning
340 Warn about compile-time integer division by zero
343 C++ ObjC++ Var(warn_ecpp) Warning
344 Warn about violations of Effective C++ style rules
347 C ObjC C++ ObjC++ Var(warn_empty_body) Init(-1) Warning
348 Warn about an empty body in an if or else statement
351 C ObjC C++ ObjC++ Warning
352 Warn about stray tokens after #elif and #endif
355 C ObjC C++ ObjC++ Var(warn_enum_compare) Init(-1) Warning
356 Warn about comparison of different enum types
360 ; Documented in common.opt
362 Werror-implicit-function-declaration
363 C ObjC RejectNegative Warning Alias(Werror=, implicit-function-declaration)
364 This switch is deprecated; use -Werror=implicit-function-declaration instead
367 C ObjC C++ ObjC++ Var(warn_float_equal) Warning
368 Warn if testing floating point numbers for equality
371 C ObjC C++ ObjC++ Warning
372 Warn about printf/scanf/strftime/strfmon format string anomalies
375 C ObjC C++ ObjC++ Var(warn_format_extra_args) Warning
376 Warn if passing too many arguments to a function for its format string
379 C ObjC C++ ObjC++ Var(warn_format_nonliteral) Warning
380 Warn about format strings that are not literals
383 C ObjC C++ ObjC++ Var(warn_format_contains_nul) Warning
384 Warn about format strings that contain NUL bytes
387 C ObjC C++ ObjC++ Var(warn_format_security) Warning
388 Warn about possible security problems with format functions
391 C ObjC C++ ObjC++ Var(warn_format_y2k) Warning
392 Warn about strftime formats yielding 2-digit years
395 C ObjC Var(warn_format_zero_length) Warning
396 Warn about zero-length formats
399 C ObjC C++ ObjC++ Joined Warning
402 C C++ Var(warn_ignored_qualifiers) Init(-1) Warning
403 Warn whenever type qualifiers are ignored.
406 C ObjC C++ ObjC++ Var(warn_init_self) Warning
407 Warn about variables which are initialized to themselves
410 C ObjC Var(warn_implicit) Init(-1) Warning
411 Warn about implicit declarations
414 C ObjC C++ ObjC++ Var(warn_double_promotion) Warning
415 Warn about implicit conversions from \"float\" to \"double\"
417 Wimplicit-function-declaration
418 C ObjC Var(warn_implicit_function_declaration) Init(-1) Warning
419 Warn about implicit function declarations
422 C ObjC Var(warn_implicit_int) Init(-1) Warning
423 Warn when a declaration does not specify a type
426 C ObjC C++ ObjC++ Undocumented Ignore
429 C ObjC C++ ObjC++ Var(warn_int_to_pointer_cast) Init(1) Warning
430 Warn when there is a cast to a pointer from an integer of a different size
433 C++ ObjC++ Var(warn_invalid_offsetof) Init(1) Warning
434 Warn about invalid uses of the \"offsetof\" macro
437 C ObjC C++ ObjC++ Warning
438 Warn about PCH files that are found but not used
441 C ObjC Var(warn_jump_misses_init) Init(-1) Warning
442 Warn when a jump misses a variable initialization
445 C ObjC C++ ObjC++ Var(warn_logical_op) Init(0) Warning
446 Warn when a logical operator is suspiciously always evaluating to true or false
449 C ObjC C++ ObjC++ Var(warn_long_long) Init(-1) Warning
450 Do not warn about using \"long long\" when -pedantic
453 C ObjC C++ ObjC++ Var(warn_main) Init(-1) Warning
454 Warn about suspicious declarations of \"main\"
457 C ObjC C++ ObjC++ Var(warn_missing_braces) Warning
458 Warn about possibly missing braces around initializers
460 Wmissing-declarations
461 C ObjC C++ ObjC++ Var(warn_missing_declarations) Warning
462 Warn about global functions without previous declarations
464 Wmissing-field-initializers
465 C ObjC C++ ObjC++ Var(warn_missing_field_initializers) Init(-1) Warning
466 Warn about missing fields in struct initializers
468 Wmissing-format-attribute
469 C ObjC C++ ObjC++ Var(warn_missing_format_attribute) Warning
470 Warn about functions which might be candidates for format attributes
472 Wmissing-include-dirs
473 C ObjC C++ ObjC++ Warning
474 Warn about user-specified include directories that do not exist
476 Wmissing-parameter-type
477 C ObjC Var(warn_missing_parameter_type) Init(-1) Warning
478 Warn about function parameters declared without a type specifier in K&R-style functions
481 C ObjC Var(warn_missing_prototypes) Warning
482 Warn about global functions without prototypes
485 C ObjC C++ ObjC++ Warning
486 Warn about use of multi-character character constants
489 C ObjC Var(warn_nested_externs) Warning
490 Warn about \"extern\" declarations not at file scope
493 C++ ObjC++ Var(warn_noexcept) Warning
494 Warn when a noexcept expression evaluates to false even though the expression can't actually throw
497 C++ ObjC++ Var(warn_nontemplate_friend) Init(1) Warning
498 Warn when non-templatized friend functions are declared within a template
501 C++ ObjC++ Var(warn_nonvdtor) Warning
502 Warn about non-virtual destructors
505 C ObjC Var(warn_nonnull) Warning
506 Warn about NULL being passed to argument slots marked as requiring non-NULL
509 C ObjC C++ ObjC++ Joined Warning
510 -Wnormalized=<id|nfc|nfkc> Warn about non-normalised Unicode strings
513 C++ ObjC++ Var(warn_old_style_cast) Warning
514 Warn if a C-style cast is used in a program
516 Wold-style-declaration
517 C ObjC Var(warn_old_style_declaration) Init(-1) Warning
518 Warn for obsolescent usage in a declaration
520 Wold-style-definition
521 C ObjC Var(warn_old_style_definition) Warning
522 Warn if an old-style parameter definition is used
525 C ObjC C++ ObjC++ Var(warn_overlength_strings) Init(-1) Warning
526 Warn if a string is longer than the maximum portable length specified by the standard
529 C++ ObjC++ Var(warn_overloaded_virtual) Warning
530 Warn about overloaded virtual function names
533 C ObjC Var(warn_override_init) Init(-1) Warning
534 Warn about overriding initializers without side effects
536 Wpacked-bitfield-compat
537 C ObjC C++ ObjC++ Var(warn_packed_bitfield_compat) Init(-1) Warning
538 Warn about packed bit-fields whose offset changed in GCC 4.4
541 C ObjC C++ ObjC++ Var(warn_parentheses) Warning
542 Warn about possibly missing parentheses
545 C++ ObjC++ Var(warn_pmf2ptr) Init(1) Warning
546 Warn when converting the type of pointers to member functions
549 C ObjC C++ ObjC++ Var(warn_pointer_arith) Warning
550 Warn about function pointer arithmetic
553 C ObjC Var(warn_pointer_to_int_cast) Init(1) Warning
554 Warn when a pointer is cast to an integer of a different size
557 C ObjC C++ ObjC++ Var(warn_pragmas) Init(1) Warning
558 Warn about misuses of pragmas
560 Wproperty-assign-default
561 ObjC ObjC++ Var(warn_property_assign_default) Init(1) Warning
562 Warn if a property for an Objective-C object has no assign semantics specified
565 ObjC ObjC++ Var(warn_protocol) Init(1) Warning
566 Warn if inherited methods are unimplemented
569 C ObjC C++ ObjC++ Var(warn_redundant_decls) Warning
570 Warn about multiple declarations of the same object
573 C++ ObjC++ Var(warn_reorder) Warning
574 Warn when the compiler reorders code
577 C ObjC C++ ObjC++ Var(warn_return_type) Warning
578 Warn whenever a function's return type defaults to \"int\" (C), or about inconsistent return types (C++)
581 ObjC ObjC++ Var(warn_selector) Warning
582 Warn if a selector has multiple methods
585 C ObjC C++ ObjC++ Var(warn_sequence_point) Warning
586 Warn about possible violations of sequence point rules
589 C ObjC C++ ObjC++ Var(warn_sign_compare) Init(-1) Warning
590 Warn about signed-unsigned comparisons
593 C++ ObjC++ Var(warn_sign_promo) Warning
594 Warn when overload promotes from unsigned to signed
596 Wstrict-null-sentinel
597 C++ ObjC++ Warning Var(warn_strict_null_sentinel)
598 Warn about uncasted NULL used as sentinel
601 C ObjC Var(warn_strict_prototypes) Warning
602 Warn about unprototyped function declarations
604 Wstrict-selector-match
605 ObjC ObjC++ Var(warn_strict_selector_match) Warning
606 Warn if type signatures of candidate methods do not match exactly
609 C C++ Var(warn_sync_nand) Init(1) Warning
610 Warn when __sync_fetch_and_nand and __sync_nand_and_fetch built-in functions are used
613 C++ ObjC++ Var(warn_synth) Warning
614 Deprecated. This switch has no effect
617 C ObjC C++ ObjC++ Warning
618 ; Documented in common.opt
621 C ObjC Var(warn_traditional) Warning
622 Warn about features not present in traditional C
624 Wtraditional-conversion
625 C ObjC Var(warn_traditional_conversion) Warning
626 Warn of prototypes causing type conversions different from what would happen in the absence of prototype
629 C ObjC C++ ObjC++ Warning
630 Warn if trigraphs are encountered that might affect the meaning of the program
633 ObjC ObjC++ Var(warn_undeclared_selector) Warning
634 Warn about @selector()s without previously declared methods
637 C ObjC C++ ObjC++ Warning
638 Warn if an undefined macro is used in an #if directive
641 C ObjC C++ ObjC++ Warning
642 Warn about unrecognized pragmas
644 Wunsuffixed-float-constants
645 C ObjC Var(warn_unsuffixed_float_constants) Warning
646 Warn about unsuffixed float constants
649 C ObjC C++ ObjC++ Warning
650 Warn about macros defined in the main file that are not used
653 C ObjC C++ ObjC++ Var(warn_unused_result) Init(1) Warning
654 Warn if a caller of a function, marked with attribute warn_unused_result, does not use its return value
657 C ObjC C++ ObjC++ Warning
658 Do not warn about using variadic macros when -pedantic
661 C ObjC C++ ObjC++ Var(warn_vla) Init(-1) Warning
662 Warn if a variable length array is used
664 Wvolatile-register-var
665 C ObjC C++ ObjC++ Var(warn_volatile_register_var) Warning
666 Warn when a register variable is declared volatile
669 C ObjC C++ ObjC++ Var(warn_write_strings) Warning
670 In C++, nonzero means warn about deprecated conversion from string literals to 'char *'. In C, similar warning, except that the conversion is of course not deprecated by the ISO C standard.
673 C ObjC Var(warn_pointer_sign) Init(-1) Warning
674 Warn when a pointer differs in signedness in an assignment
678 A synonym for -std=c89 (for C) or -std=c++98 (for C++)
681 C ObjC C++ ObjC++ Joined
682 ; Documented in common.opt. FIXME - what about -dI, -dD, -dN and -dD?
685 C++ ObjC++ Var(flag_access_control) Init(1)
686 Enforce class member access control semantics
689 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
691 falt-external-templates
692 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
696 C ObjC C++ ObjC++ Var(flag_no_asm, 0)
697 Recognize the \"asm\" keyword
700 C ObjC C++ ObjC++ Var(flag_no_builtin, 0)
701 Recognize built-in functions
704 C ObjC C++ ObjC++ Joined
707 C++ ObjC++ Var(flag_check_new)
708 Check the return value of new
712 Allow the arguments of the '?' operator to have different types
715 C++ ObjC++ Var(flag_conserve_space)
716 Reduce the size of object files
718 fconstant-string-class=
719 ObjC ObjC++ Joined MissingArgError(no class name specified with %qs)
720 -fconst-string-class=<name> Use class <name> for constant strings
723 C++ ObjC++ Joined RejectNegative UInteger Var(max_constexpr_depth) Init(512)
724 -fconstexpr-depth=<number> Specify maximum constexpr recursion depth
727 C++ ObjC++ Var(flag_deduce_init_list) Init(1)
728 -fno-deduce-init-list disable deduction of std::initializer_list for a template type parameter from a brace-enclosed initializer-list
732 Does nothing. Preserved for backward compatibility.
736 Preprocess directives only.
738 fdollars-in-identifiers
740 Permit '$' as an identifier character
743 C++ ObjC++ Var(flag_elide_constructors) Init(1)
746 C++ ObjC++ Var(flag_enforce_eh_specs) Init(1)
747 Generate code to check exception specifications
750 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
753 C ObjC C++ ObjC++ Joined RejectNegative
754 -fexec-charset=<cset> Convert all strings and character constants to character set <cset>
756 fextended-identifiers
758 Permit universal character names (\\u and \\U) in identifiers
761 C ObjC C++ ObjC++ Joined RejectNegative
762 -finput-charset=<cset> Specify the default character set for source files
766 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
769 C++ ObjC++ Var(flag_new_for_scope) Init(1)
770 Scope of for-init-statement variables is local to the loop
774 Do not assume that standard C libraries and \"main\" exist
777 C++ ObjC++ Var(flag_no_gnu_keywords, 0)
778 Recognize GNU-defined keywords
782 Generate code for GNU runtime environment
785 C ObjC Var(flag_gnu89_inline) Init(-1)
786 Use traditional GNU semantics for inline functions
789 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
792 C++ ObjC++ Optimization Alias(fexceptions) Warn({-fhandle-exceptions has been renamed -fexceptions (and is now on by default)})
795 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
799 Assume normal C execution environment
802 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
806 C++ ObjC++ Var(flag_implement_inlines) Init(1)
807 Export functions even if they can be inlined
809 fimplicit-inline-templates
810 C++ ObjC++ Var(flag_implicit_inline_templates) Init(1)
811 Emit implicit instantiations of inline templates
814 C++ ObjC++ Var(flag_implicit_templates) Init(1)
815 Emit implicit instantiations of templates
818 C++ ObjC++ Var(flag_friend_injection)
819 Inject friend functions into enclosing namespace
821 fkeep-inline-dllexport
822 C C++ ObjC ObjC++ Var(flag_keep_inline_dllexport) Init(1) Report Condition(TARGET_DLLIMPORT_DECL_ATTRIBUTES)
823 Don't emit dllexported inline functions unless needed
826 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
828 flax-vector-conversions
829 C ObjC C++ ObjC++ Var(flag_lax_vector_conversions)
830 Allow implicit conversions between vectors with differing numbers of subparts and/or differing element types.
833 C ObjC C++ ObjC++ Var(flag_ms_extensions)
834 Don't warn about uses of Microsoft extensions
836 fname-mangling-version-
837 C++ ObjC++ Joined Ignore Warn(switch %qs is no longer supported)
840 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
844 Generate code for NeXT (Apple Mac OS X) runtime environment
847 ObjC ObjC++ Var(flag_nil_receivers) Init(1)
848 Assume that receivers of Objective-C messages may be nil
851 C++ ObjC++ Var(flag_no_nonansi_builtin, 0)
854 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
857 C++ ObjC++ Optimization Var(flag_nothrow_opt)
858 Treat a throw() exception specification as noexcept to improve code size
861 ObjC ObjC++ Joined Report RejectNegative UInteger Var(flag_objc_abi)
862 Specify which ABI to use for Objective-C family code and meta-data generation.
864 ; Generate special '- .cxx_construct' and '- .cxx_destruct' methods
865 ; to initialize any non-POD ivars in Objective-C++ classes.
866 fobjc-call-cxx-cdtors
867 ObjC++ Var(flag_objc_call_cxx_cdtors)
868 Generate special Objective-C methods to initialize/destroy non-POD C++ ivars, if needed
870 fobjc-direct-dispatch
871 ObjC ObjC++ Var(flag_objc_direct_dispatch)
872 Allow fast jumps to the message dispatcher
874 ; Nonzero means that we will allow new ObjC exception syntax (@throw,
875 ; @try, etc.) in source code.
877 ObjC ObjC++ Var(flag_objc_exceptions)
878 Enable Objective-C exception and synchronization syntax
881 ObjC ObjC++ Var(flag_objc_gc)
882 Enable garbage collection (GC) in Objective-C/Objective-C++ programs
885 ObjC ObjC++ Var(flag_objc_nilcheck,1)
886 Enable inline checks for nil receivers with the NeXT runtime and ABI version 2.
888 ; Nonzero means that we generate NeXT setjmp based exceptions.
889 fobjc-sjlj-exceptions
890 ObjC ObjC++ Var(flag_objc_sjlj_exceptions) Init(-1)
891 Enable Objective-C setjmp exception handling runtime
894 ObjC ObjC++ Var(flag_objc1_only)
895 Conform to the Objective-C 1.0 language as implemented in GCC 4.0
898 C ObjC C++ ObjC++ Var(flag_openmp)
899 Enable OpenMP (implies -frecursive in Fortran)
903 Recognize C++ keywords like \"compl\" and \"xor\"
907 Does nothing. Preserved for backward compatibility.
914 Look for and use PCH files even when preprocessing
918 Downgrade conformance errors to warnings
921 C ObjC Var(flag_plan9_extensions)
922 Enable Plan 9 language extensions
926 Treat the input file as already preprocessed
929 C++ ObjC++ Var(flag_pretty_templates) Init(1)
930 -fno-pretty-templates Do not pretty-print template specializations as the template signature followed by the arguments
932 freplace-objc-classes
933 ObjC ObjC++ Var(flag_replace_objc_classes)
934 Used in Fix-and-Continue mode to indicate that object files may be swapped in at runtime
938 Enable automatic template instantiation
941 C++ ObjC++ Optimization Var(flag_rtti) Init(1)
942 Generate run time type descriptor information
945 C ObjC C++ ObjC++ Optimization Var(flag_short_double)
946 Use the same size for double as for float
949 C ObjC C++ ObjC++ Optimization Var(flag_short_enums)
950 Use the narrowest integer type possible for enumeration types
953 C ObjC C++ ObjC++ Optimization Var(flag_short_wchar)
954 Force the underlying type for \"wchar_t\" to be \"unsigned short\"
957 C ObjC C++ ObjC++ Var(flag_signed_bitfields) Init(1)
958 When \"signed\" or \"unsigned\" is not given make the bitfield signed
961 C ObjC C++ ObjC++ LTO Var(flag_signed_char)
962 Make \"char\" signed by default
965 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
968 C++ ObjC++ Var(flag_detailed_statistics)
969 Display statistics accumulated during compilation
972 C++ ObjC++ Optimization Var(flag_strict_enums)
973 Assume that values of enumeration type are always within the minimum range of that type
976 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
979 C ObjC C++ ObjC++ Joined RejectNegative UInteger
980 -ftabstop=<number> Distance between tab stops for column reporting
983 C++ ObjC++ Joined RejectNegative Undocumented Alias(ftemplate-depth=)
986 C++ ObjC++ Joined RejectNegative UInteger
987 -ftemplate-depth=<number> Specify maximum template instantiation depth
990 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
993 C++ ObjC++ Optimization Var(flag_threadsafe_statics) Init(1)
994 -fno-threadsafe-statics Do not generate thread-safe code for initializing local statics
997 C ObjC C++ ObjC++ Var(flag_signed_bitfields, 0)
998 When \"signed\" or \"unsigned\" is not given make the bitfield unsigned
1001 C ObjC C++ ObjC++ LTO Var(flag_signed_char, 0)
1002 Make \"char\" unsigned by default
1005 C++ ObjC++ Var(flag_use_cxa_atexit) Init(DEFAULT_USE_CXA_ATEXIT)
1006 Use __cxa_atexit to register destructors
1008 fuse-cxa-get-exception-ptr
1009 C++ ObjC++ Var(flag_use_cxa_get_exception_ptr) Init(2)
1010 Use __cxa_get_exception_ptr in exception handling
1012 fvisibility-inlines-hidden
1014 Marks all inlined methods as having hidden visibility
1016 fvisibility-ms-compat
1017 C++ ObjC++ Var(flag_visibility_ms_compat)
1018 Changes visibility to match Microsoft Visual Studio by default
1021 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1025 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1029 C++ ObjC++ Var(flag_weak) Init(1)
1030 Emit common-like symbols as weak symbols
1033 C ObjC C++ ObjC++ Joined RejectNegative
1034 -fwide-exec-charset=<cset> Convert all wide strings and character constants to character set <cset>
1037 C ObjC C++ ObjC++ Var(flag_working_directory) Init(-1)
1038 Generate a #line directive pointing at the current working directory
1041 C++ ObjC++ Ignore Warn(switch %qs is no longer supported)
1045 ObjC ObjC++ Var(flag_zero_link)
1046 Generate lazy class lookup (via objc_getClass()) for use in Zero-Link mode
1049 ObjC ObjC++ Var(flag_gen_declaration)
1050 Dump declarations to a .decl file
1052 femit-struct-debug-baseonly
1054 -femit-struct-debug-baseonly Aggressive reduced debug info for structs
1056 femit-struct-debug-reduced
1058 -femit-struct-debug-reduced Conservative reduced debug info for structs
1060 femit-struct-debug-detailed=
1061 C ObjC C++ ObjC++ Joined
1062 -femit-struct-debug-detailed=<spec-list> Detailed reduced debug info for structs
1065 C ObjC C++ ObjC++ Joined Separate MissingArgError(missing path after %qs)
1066 -idirafter <dir> Add <dir> to the end of the system include path
1069 C ObjC C++ ObjC++ Joined Separate MissingArgError(missing filename after %qs)
1070 -imacros <file> Accept definition of macros in <file>
1073 C ObjC C++ ObjC++ Joined Separate
1074 -imultilib <dir> Set <dir> to be the multilib include subdirectory
1077 C ObjC C++ ObjC++ Joined Separate MissingArgError(missing filename after %qs)
1078 -include <file> Include the contents of <file> before other files
1081 C ObjC C++ ObjC++ Joined Separate
1082 -iprefix <path> Specify <path> as a prefix for next two options
1085 C ObjC C++ ObjC++ Joined Separate MissingArgError(missing path after %qs)
1086 -isysroot <dir> Set <dir> to be the system root directory
1089 C ObjC C++ ObjC++ Joined Separate MissingArgError(missing path after %qs)
1090 -isystem <dir> Add <dir> to the start of the system include path
1093 C ObjC C++ ObjC++ Joined Separate MissingArgError(missing path after %qs)
1094 -iquote <dir> Add <dir> to the end of the quote include path
1097 C ObjC C++ ObjC++ Joined Separate
1098 -iwithprefix <dir> Add <dir> to the end of the system include path
1101 C ObjC C++ ObjC++ Joined Separate
1102 -iwithprefixbefore <dir> Add <dir> to the end of the main include path
1105 C Undocumented RejectDriver
1112 Do not search standard system include directories (those specified with -isystem will still be used)
1116 Do not search standard system include directories for C++
1119 C ObjC C++ ObjC++ Joined Separate
1120 ; Documented in common.opt
1124 ; Documented in common.opt
1128 ; Documented in common.opt
1130 print-objc-runtime-info
1132 Generate C header of platform-specific features
1136 Remap file names when including files
1140 Conform to the ISO 1998 C++ standard revised by the 2003 technical corrigendum
1143 C++ ObjC++ Alias(std=c++98)
1144 Conform to the ISO 1998 C++ standard revised by the 2003 technical corrigendum
1148 Conform to the ISO 1998 C++ standard, with extensions that are likely to
1149 become a part of the upcoming ISO C++ standard, dubbed C++0x. Note that the
1150 extensions enabled by this mode are experimental and may be removed in
1151 future releases of GCC.
1155 Conform to the ISO 201X C standard draft (experimental and incomplete support)
1158 C ObjC Alias(std=c90)
1159 Conform to the ISO 1990 C standard
1163 Conform to the ISO 1990 C standard
1167 Conform to the ISO 1999 C standard
1170 C ObjC Alias(std=c99)
1171 Deprecated in favor of -std=c99
1175 Conform to the ISO 1998 C++ standard with GNU extensions
1179 Conform to the ISO 1998 C++ standard, with GNU extensions and
1180 extensions that are likely to become a part of the upcoming ISO C++
1181 standard, dubbed C++0x. Note that the extensions enabled by this mode
1182 are experimental and may be removed in future releases of GCC.
1186 Conform to the ISO 201X C standard draft with GNU extensions (experimental and incomplete support)
1189 C ObjC Alias(std=gnu90)
1190 Conform to the ISO 1990 C standard with GNU extensions
1194 Conform to the ISO 1990 C standard with GNU extensions
1198 Conform to the ISO 1999 C standard with GNU extensions
1201 C ObjC Alias(std=gnu99)
1202 Deprecated in favor of -std=gnu99
1205 C ObjC Alias(std=c90)
1206 Conform to the ISO 1990 C standard
1210 Conform to the ISO 1990 C standard as amended in 1994
1213 C ObjC Alias(std=c99)
1214 Conform to the ISO 1999 C standard
1217 C ObjC Alias(std=c99)
1218 Deprecated in favor of -std=iso9899:1999
1225 Enable traditional preprocessing
1229 -trigraphs Support ISO C trigraphs
1232 C ObjC C++ ObjC++ Var(flag_undef)
1233 Do not predefine system-specific and GCC-specific macros
1237 ; Documented in common.opt
1241 ; Documented in common.opt
1243 ; This comment is to ensure we retain the blank line above.