1 ; Options for the C, ObjC, C++ and ObjC++ front ends.
2 ; Copyright (C) 2003, 2004, 2005, 2006, 2007 Free Software Foundation, Inc.
4 ; This file is part of GCC.
6 ; GCC is free software; you can redistribute it and/or modify it under
7 ; the terms of the GNU General Public License as published by the Free
8 ; Software Foundation; either version 3, or (at your option) any later
11 ; GCC is distributed in the hope that it will be useful, but WITHOUT ANY
12 ; WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 ; FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 ; You should have received a copy of the GNU General Public License
17 ; along with GCC; see the file COPYING3. If not see
18 ; <http://www.gnu.org/licenses/>.
20 ; See the GCC internals manual for a description of this file's format.
22 ; Please try to keep this file in ASCII collating order.
37 C ObjC C++ ObjC++ Joined Separate
40 C ObjC C++ ObjC++ Joined Separate
41 -A<question>=<answer> Assert the <answer> to <question>. Putting '-' before <question> disables the <answer> to <question>
45 Do not discard comments
49 Do not discard comments in macro expansions
52 C ObjC C++ ObjC++ Joined Separate
53 -D<macro>[=<val>] Define a <macro> with <val> as its value. If just <macro> is given, <val> is taken to be 1
56 C ObjC C++ ObjC++ Undocumented
59 C ObjC C++ ObjC++ Joined Separate
60 -F <dir> Add <dir> to the end of the main framework include path
64 Print the name of header files as they are used
67 C ObjC C++ ObjC++ Joined Separate
68 -I <dir> Add <dir> to the end of the main include path
72 Generate make dependencies
75 C ObjC C++ ObjC++ Separate
76 Generate make dependencies and compile
79 C ObjC C++ ObjC++ Joined Separate
80 -MF <file> Write dependency output to the given file
84 Treat missing header files as generated files
88 Like -M but ignore system header files
91 C ObjC C++ ObjC++ Separate
92 Like -MD but ignore system header files
96 Generate phony targets for all headers
99 C ObjC C++ ObjC++ Joined Separate
100 -MQ <target> Add a MAKE-quoted target
103 C ObjC C++ ObjC++ Joined Separate
104 -MT <target> Add an unquoted target
108 Do not generate #line directives
111 C ObjC C++ ObjC++ Joined Separate
112 -U<macro> Undefine <macro>
115 C++ ObjC++ Var(warn_abi) Warning
116 Warn about things that will change when compiling with an ABI-compliant compiler
119 C ObjC C++ ObjC++ Var(warn_address) Warning
120 Warn about suspicious uses of memory addresses
123 C ObjC C++ ObjC++ Warning
124 Enable most warning messages
127 ObjC ObjC++ Var(warn_assign_intercept) Warning
128 Warn whenever an Objective-C assignment is being intercepted by the garbage collector
131 C ObjC Var(warn_bad_function_cast) Warning
132 Warn about casting functions to incompatible types
134 Wbuiltin-macro-redefined
135 C ObjC C++ ObjC++ Warning
136 Warn when a built-in preprocessor macro is undefined or redefined
139 C ObjC Var(warn_cxx_compat) Warning
140 Warn about C constructs that are not in the common subset of C and C++
143 C++ ObjC++ Var(warn_cxx0x_compat) Warning
144 Warn about C++ constructs whose meaning differs between ISO C++ 1998 and ISO C++ 200x
147 C ObjC C++ ObjC++ Var(warn_cast_qual) Warning
148 Warn about casts which discard qualifiers
151 C ObjC C++ ObjC++ Var(warn_char_subscripts) Warning
152 Warn about subscripts whose type is \"char\"
155 C ObjC C++ ObjC++ Var(warn_clobbered) Init(-1) Warning
156 Warn about variables that might be changed by \"longjmp\" or \"vfork\"
159 C ObjC C++ ObjC++ Warning
160 Warn about possibly nested block comments, and C++ comments spanning more than one physical line
163 C ObjC C++ ObjC++ Warning
164 Synonym for -Wcomment
167 C ObjC C++ ObjC++ Var(warn_conversion) Warning
168 Warn for implicit type conversions that may change a value
171 C ObjC C++ ObjC++ Var(warn_sign_conversion) Init(-1)
172 Warn for implicit type conversions between signed and unsigned integers
175 C++ ObjC++ Var(warn_ctor_dtor_privacy) Warning
176 Warn when all constructors and destructors are private
178 Wdeclaration-after-statement
179 C ObjC Var(warn_declaration_after_statement) Warning
180 Warn when a declaration is found after a statement
183 C C++ ObjC ObjC++ Var(warn_deprecated) Init(1) Warning
184 Warn about deprecated compiler features
187 C ObjC C++ ObjC++ Var(warn_div_by_zero) Init(1) Warning
188 Warn about compile-time integer division by zero
191 C++ ObjC++ Var(warn_ecpp) Warning
192 Warn about violations of Effective C++ style rules
195 C ObjC C++ ObjC++ Var(warn_empty_body) Init(-1) Warning
196 Warn about an empty body in an if or else statement
199 C ObjC C++ ObjC++ Warning
200 Warn about stray tokens after #elif and #endif
203 C++ ObjC++ Var(warn_enum_compare) Init(1) Warning
204 Warn about comparison of different enum types
208 ; Documented in common.opt
210 Werror-implicit-function-declaration
211 C ObjC RejectNegative Warning
212 This switch is deprecated; use -Werror=implicit-function-declaration instead
215 C ObjC C++ ObjC++ Var(warn_float_equal) Warning
216 Warn if testing floating point numbers for equality
219 C ObjC C++ ObjC++ Warning
220 Warn about printf/scanf/strftime/strfmon format string anomalies
223 C ObjC C++ ObjC++ Var(warn_format_extra_args) Warning
224 Warn if passing too many arguments to a function for its format string
227 C ObjC C++ ObjC++ Var(warn_format_nonliteral) Warning
228 Warn about format strings that are not literals
231 C ObjC C++ ObjC++ Var(warn_format_contains_nul) Warning
232 Warn about format strings that contain NUL bytes
235 C ObjC C++ ObjC++ Var(warn_format_security) Warning
236 Warn about possible security problems with format functions
239 C ObjC C++ ObjC++ Var(warn_format_y2k) Warning
240 Warn about strftime formats yielding 2-digit years
243 C ObjC Var(warn_format_zero_length) Warning
244 Warn about zero-length formats
247 C ObjC C++ ObjC++ Joined Warning
250 C C++ Var(warn_ignored_qualifiers) Init(-1) Warning
251 Warn whenever type qualifiers are ignored.
254 C ObjC C++ ObjC++ Var(warn_init_self) Warning
255 Warn about variables which are initialized to themselves
258 C ObjC C++ ObjC++ Warning
260 Wimplicit-function-declaration
261 C ObjC Var(warn_implicit_function_declaration) Init(-1) Warning
262 Warn about implicit function declarations
265 C ObjC Var(warn_implicit_int) Warning
266 Warn when a declaration does not specify a type
269 C ObjC C++ ObjC++ Undocumented
272 C ObjC Var(warn_int_to_pointer_cast) Init(1) Warning
273 Warn when there is a cast to a pointer from an integer of a different size
276 C++ ObjC++ Var(warn_invalid_offsetof) Init(1) Warning
277 Warn about invalid uses of the \"offsetof\" macro
280 C ObjC C++ ObjC++ Warning
281 Warn about PCH files that are found but not used
284 C ObjC C++ ObjC++ Var(warn_long_long) Init(1) Warning
285 Do not warn about using \"long long\" when -pedantic
288 C ObjC C++ ObjC++ Var(warn_main) Init(-1) Warning
289 Warn about suspicious declarations of \"main\"
292 C ObjC C++ ObjC++ Var(warn_missing_braces) Warning
293 Warn about possibly missing braces around initializers
295 Wmissing-declarations
296 C ObjC C++ ObjC++ Var(warn_missing_declarations) Warning
297 Warn about global functions without previous declarations
299 Wmissing-field-initializers
300 C ObjC C++ ObjC++ Var(warn_missing_field_initializers) Init(-1) Warning
301 Warn about missing fields in struct initializers
303 Wmissing-format-attribute
304 C ObjC C++ ObjC++ Var(warn_missing_format_attribute) Warning
305 Warn about functions which might be candidates for format attributes
307 Wmissing-include-dirs
308 C ObjC C++ ObjC++ Warning
309 Warn about user-specified include directories that do not exist
311 Wmissing-parameter-type
312 C ObjC Var(warn_missing_parameter_type) Init(-1) Warning
313 Warn about function parameters declared without a type specifier in K&R-style functions
316 C ObjC Var(warn_missing_prototypes) Warning
317 Warn about global functions without prototypes
320 C ObjC C++ ObjC++ Warning
321 Warn about use of multi-character character constants
324 C ObjC Var(warn_nested_externs) Warning
325 Warn about \"extern\" declarations not at file scope
328 C++ ObjC++ Var(warn_nontemplate_friend) Init(1) Warning
329 Warn when non-templatized friend functions are declared within a template
332 C++ ObjC++ Var(warn_nonvdtor) Warning
333 Warn about non-virtual destructors
336 C ObjC Var(warn_nonnull) Warning
337 Warn about NULL being passed to argument slots marked as requiring non-NULL
340 C ObjC C++ ObjC++ Joined Warning
341 -Wnormalized=<id|nfc|nfkc> Warn about non-normalised Unicode strings
344 C++ ObjC++ Var(warn_old_style_cast) Warning
345 Warn if a C-style cast is used in a program
347 Wold-style-declaration
348 C ObjC Var(warn_old_style_declaration) Init(-1) Warning
349 Warn for obsolescent usage in a declaration
351 Wold-style-definition
352 C ObjC Var(warn_old_style_definition) Warning
353 Warn if an old-style parameter definition is used
356 C ObjC C++ ObjC++ Var(warn_overlength_strings) Init(-1) Warning
357 Warn if a string is longer than the maximum portable length specified by the standard
360 C++ ObjC++ Var(warn_overloaded_virtual) Warning
361 Warn about overloaded virtual function names
364 C ObjC Var(warn_override_init) Init(-1) Warning
365 Warn about overriding initializers without side effects
367 Wpacked-bitfield-compat
368 C ObjC C++ ObjC++ Var(warn_packed_bitfield_compat) Init(-1) Warning
369 Warn about packed bit-fields whose offset changed in GCC 4.4
372 C ObjC C++ ObjC++ Var(warn_parentheses) Warning
373 Warn about possibly missing parentheses
376 C++ ObjC++ Var(warn_pmf2ptr) Init(1) Warning
377 Warn when converting the type of pointers to member functions
380 C ObjC C++ ObjC++ Var(warn_pointer_arith) Warning
381 Warn about function pointer arithmetic
384 C ObjC Var(warn_pointer_to_int_cast) Init(1) Warning
385 Warn when a pointer is cast to an integer of a different size
388 C ObjC C++ ObjC++ Var(warn_pragmas) Init(1) Warning
389 Warn about misuses of pragmas
392 ObjC ObjC++ Var(warn_protocol) Init(1) Warning
393 Warn if inherited methods are unimplemented
396 C ObjC C++ ObjC++ Var(warn_redundant_decls) Warning
397 Warn about multiple declarations of the same object
400 C++ ObjC++ Var(warn_reorder) Warning
401 Warn when the compiler reorders code
404 C ObjC C++ ObjC++ Var(warn_return_type) Warning
405 Warn whenever a function's return type defaults to \"int\" (C), or about inconsistent return types (C++)
408 ObjC ObjC++ Var(warn_selector) Warning
409 Warn if a selector has multiple methods
412 C ObjC C++ ObjC++ Var(warn_sequence_point) Warning
413 Warn about possible violations of sequence point rules
416 C ObjC C++ ObjC++ Var(warn_sign_compare) Init(-1) Warning
417 Warn about signed-unsigned comparisons
420 C++ ObjC++ Var(warn_sign_promo) Warning
421 Warn when overload promotes from unsigned to signed
423 Wstrict-null-sentinel
425 Warn about uncasted NULL used as sentinel
428 C ObjC Var(warn_strict_prototypes) Warning
429 Warn about unprototyped function declarations
431 Wstrict-selector-match
432 ObjC ObjC++ Var(warn_strict_selector_match) Warning
433 Warn if type signatures of candidate methods do not match exactly
436 C C++ Var(warn_sync_nand) Init(1) Warning
437 Warn when __sync_fetch_and_nand and __sync_nand_and_fetch built-in functions are used
440 C++ ObjC++ Var(warn_synth) Warning
441 Deprecated. This switch has no effect
444 C ObjC C++ ObjC++ Warning
445 Do not suppress warnings from system headers
448 C ObjC Var(warn_traditional) Warning
449 Warn about features not present in traditional C
451 Wtraditional-conversion
452 C ObjC Var(warn_traditional_conversion) Warning
453 Warn of prototypes causing type conversions different from what would happen in the absence of prototype
456 C ObjC C++ ObjC++ Warning
457 Warn if trigraphs are encountered that might affect the meaning of the program
460 ObjC ObjC++ Var(warn_undeclared_selector) Warning
461 Warn about @selector()s without previously declared methods
464 C ObjC C++ ObjC++ Warning
465 Warn if an undefined macro is used in an #if directive
468 C ObjC C++ ObjC++ Warning
469 Warn about unrecognized pragmas
472 C ObjC C++ ObjC++ Warning
473 Warn about macros defined in the main file that are not used
476 C ObjC C++ ObjC++ Warning
477 Do not warn about using variadic macros when -pedantic
480 C ObjC C++ ObjC++ Var(warn_vla) Init(-1) Warning
481 Warn if a variable length array is used
483 Wvolatile-register-var
484 C ObjC C++ ObjC++ Var(warn_volatile_register_var) Warning
485 Warn when a register variable is declared volatile
488 C ObjC C++ ObjC++ Var(warn_write_strings) Warning
489 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.
492 C ObjC Var(warn_pointer_sign) Init(-1) Warning
493 Warn when a pointer differs in signedness in an assignment
497 A synonym for -std=c89 (for C) or -std=c++98 (for C++)
500 C ObjC C++ ObjC++ Joined
501 ; Documented in common.opt. FIXME - what about -dI, -dD, -dN and -dD?
505 Enforce class member access control semantics
510 falt-external-templates
512 Change when template instances are emitted
516 Recognize the \"asm\" keyword
520 Recognize built-in functions
523 C ObjC C++ ObjC++ Joined
527 Check the return value of new
531 Allow the arguments of the '?' operator to have different types
535 Reduce the size of object files
537 fconstant-string-class=
539 -fconst-string-class=<name> Use class <name> for constant strings
543 Inline member functions by default
547 Preprocess directives only.
549 fdollars-in-identifiers
551 Permit '$' as an identifier character
558 Generate code to check exception specifications
564 C ObjC C++ ObjC++ Joined RejectNegative
565 -fexec-charset=<cset> Convert all strings and character constants to character set <cset>
567 fextended-identifiers
569 Permit universal character names (\\u and \\U) in identifiers
572 C ObjC C++ ObjC++ Joined RejectNegative
573 -finput-charset=<cset> Specify the default character set for source files
581 Scope of for-init-statement variables is local to the loop
585 Do not assume that standard C libraries and \"main\" exist
589 Recognize GNU-defined keywords
593 Generate code for GNU runtime environment
596 C ObjC Var(flag_gnu89_inline) Init(-1)
597 Use traditional GNU semantics for inline functions
603 C++ ObjC++ Optimization
610 Assume normal C execution environment
614 Enable support for huge objects
618 Export functions even if they can be inlined
620 fimplicit-inline-templates
622 Emit implicit instantiations of inline templates
626 Emit implicit instantiations of templates
629 C++ ObjC++ Var(flag_friend_injection)
630 Inject friend functions into enclosing namespace
635 flax-vector-conversions
637 Allow implicit conversions between vectors with differing numbers of subparts and/or differing element types.
641 Don't warn about uses of Microsoft extensions
643 fname-mangling-version-
651 Generate code for NeXT (Apple Mac OS X) runtime environment
655 Assume that receivers of Objective-C messages may be nil
663 ; Generate special '- .cxx_construct' and '- .cxx_destruct' methods
664 ; to initialize any non-POD ivars in Objective-C++ classes.
665 fobjc-call-cxx-cdtors
666 ObjC++ Var(flag_objc_call_cxx_cdtors)
667 Generate special Objective-C methods to initialize/destroy non-POD C++ ivars, if needed
669 fobjc-direct-dispatch
670 ObjC ObjC++ Var(flag_objc_direct_dispatch)
671 Allow fast jumps to the message dispatcher
673 ; Nonzero means that we will allow new ObjC exception syntax (@throw,
674 ; @try, etc.) in source code.
676 ObjC ObjC++ Var(flag_objc_exceptions)
677 Enable Objective-C exception and synchronization syntax
680 ObjC ObjC++ Var(flag_objc_gc)
681 Enable garbage collection (GC) in Objective-C/Objective-C++ programs
683 ; Nonzero means that we generate NeXT setjmp based exceptions.
684 fobjc-sjlj-exceptions
685 ObjC ObjC++ Var(flag_objc_sjlj_exceptions) Init(-1)
686 Enable Objective-C setjmp exception handling runtime
689 C ObjC C++ ObjC++ Var(flag_openmp)
694 Recognize C++ keywords like \"compl\" and \"xor\"
698 Enable optional diagnostics
705 Look for and use PCH files even when preprocessing
709 Downgrade conformance errors to warnings
713 Treat the input file as already preprocessed
715 freplace-objc-classes
717 Used in Fix-and-Continue mode to indicate that object files may be swapped in at runtime
721 Enable automatic template instantiation
724 C++ ObjC++ Optimization
725 Generate run time type descriptor information
728 C ObjC C++ ObjC++ Optimization
729 Use the same size for double as for float
732 C ObjC C++ ObjC++ Optimization
733 Use the narrowest integer type possible for enumeration types
736 C ObjC C++ ObjC++ Optimization
737 Force the underlying type for \"wchar_t\" to be \"unsigned short\"
741 When \"signed\" or \"unsigned\" is not given make the bitfield signed
745 Make \"char\" signed by default
752 Display statistics accumulated during compilation
758 C ObjC C++ ObjC++ Joined RejectNegative UInteger
759 -ftabstop=<number> Distance between tab stops for column reporting
762 C++ ObjC++ Joined RejectNegative UInteger
763 -ftemplate-depth-<number> Specify maximum template instantiation depth
769 C++ ObjC++ Optimization
770 -fno-threadsafe-statics Do not generate thread-safe code for initializing local statics
774 When \"signed\" or \"unsigned\" is not given make the bitfield unsigned
778 Make \"char\" unsigned by default
782 Use __cxa_atexit to register destructors
784 fuse-cxa-get-exception-ptr
786 Use __cxa_get_exception_ptr in exception handling
788 fvisibility-inlines-hidden
790 Marks all inlined methods as having hidden visibility
792 fvisibility-ms-compat
793 C++ ObjC++ Var(flag_visibility_ms_compat)
794 Changes visibility to match Microsoft Visual Studio by default
798 Discard unused virtual functions
802 Implement vtables using thunks
806 Emit common-like symbols as weak symbols
809 C ObjC C++ ObjC++ Joined RejectNegative
810 -fwide-exec-charset=<cset> Convert all wide strings and character constants to character set <cset>
814 Generate a #line directive pointing at the current working directory
818 Emit cross referencing information
822 Generate lazy class lookup (via objc_getClass()) for use in Zero-Link mode
826 Dump declarations to a .decl file
828 femit-struct-debug-baseonly
830 -femit-struct-debug-baseonly Aggressive reduced debug info for structs
832 femit-struct-debug-reduced
834 -femit-struct-debug-reduced Conservative reduced debug info for structs
836 femit-struct-debug-detailed=
837 C ObjC C++ ObjC++ Joined
838 -femit-struct-debug-detailed=<spec-list> Detailed reduced debug info for structs
841 C ObjC C++ ObjC++ Joined Separate
842 -idirafter <dir> Add <dir> to the end of the system include path
845 C ObjC C++ ObjC++ Joined Separate
846 -imacros <file> Accept definition of macros in <file>
849 C ObjC C++ ObjC++ Joined Separate
850 -imultilib <dir> Set <dir> to be the multilib include subdirectory
853 C ObjC C++ ObjC++ Joined Separate
854 -include <file> Include the contents of <file> before other files
857 C ObjC C++ ObjC++ Joined Separate
858 -iprefix <path> Specify <path> as a prefix for next two options
861 C ObjC C++ ObjC++ Joined Separate
862 -isysroot <dir> Set <dir> to be the system root directory
865 C ObjC C++ ObjC++ Joined Separate
866 -isystem <dir> Add <dir> to the start of the system include path
869 C ObjC C++ ObjC++ Joined Separate
870 -iquote <dir> Add <dir> to the end of the quote include path
873 C ObjC C++ ObjC++ Joined Separate
874 -iwithprefix <dir> Add <dir> to the end of the system include path
877 C ObjC C++ ObjC++ Joined Separate
878 -iwithprefixbefore <dir> Add <dir> to the end of the main include path
884 C ObjC C++ ObjC++ Undocumented
888 Do not search standard system include directories (those specified with -isystem will still be used)
892 Do not search standard system include directories for C++
895 C ObjC C++ ObjC++ Joined Separate
896 ; Documented in common.opt
900 ; Documented in common.opt
904 ; Documented in common.opt
906 print-objc-runtime-info
908 Generate C header of platform-specific features
912 Print a checksum of the executable for PCH validity checking, and stop
916 Remap file names when including files
920 Conform to the ISO 1998 C++ standard
924 Conform to the ISO 1998 C++ standard, with extensions that are likely to
925 become a part of the upcoming ISO C++ standard, dubbed C++0x. Note that the
926 extensions enabled by this mode are experimental and may be removed in
927 future releases of GCC.
931 Conform to the ISO 1990 C standard
935 Conform to the ISO 1999 C standard
939 Deprecated in favor of -std=c99
943 Conform to the ISO 1998 C++ standard with GNU extensions
947 Conform to the ISO 1998 C++ standard, with GNU extensions and
948 extensions that are likely to become a part of the upcoming ISO C++
949 standard, dubbed C++0x. Note that the extensions enabled by this mode
950 are experimental and may be removed in future releases of GCC.
954 Conform to the ISO 1990 C standard with GNU extensions
958 Conform to the ISO 1999 C standard with GNU extensions
962 Deprecated in favor of -std=gnu99
966 Conform to the ISO 1990 C standard
970 Conform to the ISO 1990 C standard as amended in 1994
974 Conform to the ISO 1999 C standard
978 Deprecated in favor of -std=iso9899:1999
982 Enable traditional preprocessing
986 -trigraphs Support ISO C trigraphs
990 Do not predefine system-specific and GCC-specific macros
993 Common C ObjC C++ ObjC++
994 Enable verbose output
998 ; Documented in common.opt
1000 ; This comment is to ensure we retain the blank line above.