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
135 C ObjC Var(warn_cxx_compat) Warning
136 Warn about C constructs that are not in the common subset of C and C++
139 C++ ObjC++ Var(warn_cxx0x_compat) Warning
140 Warn about C++ constructs whose meaning differs between ISO C++ 1998 and ISO C++ 200x
143 C ObjC C++ ObjC++ Var(warn_cast_qual) Warning
144 Warn about casts which discard qualifiers
147 C ObjC C++ ObjC++ Var(warn_char_subscripts) Warning
148 Warn about subscripts whose type is \"char\"
151 C ObjC C++ ObjC++ Var(warn_clobbered) Init(-1) Warning
152 Warn about variables that might be changed by \"longjmp\" or \"vfork\"
155 C ObjC C++ ObjC++ Warning
156 Warn about possibly nested block comments, and C++ comments spanning more than one physical line
159 C ObjC C++ ObjC++ Warning
160 Synonym for -Wcomment
163 C ObjC C++ ObjC++ Var(warn_conversion) Warning
164 Warn for implicit type conversions that may change a value
167 C ObjC C++ ObjC++ Var(warn_sign_conversion) Init(-1)
168 Warn for implicit type conversions between signed and unsigned integers
171 C++ ObjC++ Var(warn_ctor_dtor_privacy) Warning
172 Warn when all constructors and destructors are private
174 Wdeclaration-after-statement
175 C ObjC Var(warn_declaration_after_statement) Warning
176 Warn when a declaration is found after a statement
179 C C++ ObjC ObjC++ Var(warn_deprecated) Init(1) Warning
180 Warn about deprecated compiler features
183 C ObjC C++ ObjC++ Var(warn_div_by_zero) Init(1) Warning
184 Warn about compile-time integer division by zero
187 C++ ObjC++ Var(warn_ecpp) Warning
188 Warn about violations of Effective C++ style rules
191 C ObjC C++ ObjC++ Var(warn_empty_body) Init(-1) Warning
192 Warn about an empty body in an if or else statement
195 C ObjC C++ ObjC++ Warning
196 Warn about stray tokens after #elif and #endif
199 C++ ObjC++ Var(warn_enum_compare) Init(1) Warning
200 Warn about comparison of different enum types
204 ; Documented in common.opt
206 Werror-implicit-function-declaration
207 C ObjC RejectNegative Warning
208 This switch is deprecated; use -Werror=implicit-function-declaration instead
211 C ObjC C++ ObjC++ Var(warn_float_equal) Warning
212 Warn if testing floating point numbers for equality
215 C ObjC C++ ObjC++ Warning
216 Warn about printf/scanf/strftime/strfmon format string anomalies
219 C ObjC C++ ObjC++ Var(warn_format_extra_args) Warning
220 Warn if passing too many arguments to a function for its format string
223 C ObjC C++ ObjC++ Var(warn_format_nonliteral) Warning
224 Warn about format strings that are not literals
227 C ObjC C++ ObjC++ Var(warn_format_contains_nul) Warning
228 Warn about format strings that contain NUL bytes
231 C ObjC C++ ObjC++ Var(warn_format_security) Warning
232 Warn about possible security problems with format functions
235 C ObjC C++ ObjC++ Var(warn_format_y2k) Warning
236 Warn about strftime formats yielding 2-digit years
239 C ObjC Var(warn_format_zero_length) Warning
240 Warn about zero-length formats
243 C ObjC C++ ObjC++ Joined Warning
246 C C++ Var(warn_ignored_qualifiers) Init(-1) Warning
247 Warn whenever type qualifiers are ignored.
250 C ObjC C++ ObjC++ Var(warn_init_self) Warning
251 Warn about variables which are initialized to themselves
254 C ObjC C++ ObjC++ Warning
256 Wimplicit-function-declaration
257 C ObjC Var(warn_implicit_function_declaration) Init(-1) Warning
258 Warn about implicit function declarations
261 C ObjC Var(warn_implicit_int) Warning
262 Warn when a declaration does not specify a type
265 C ObjC C++ ObjC++ Undocumented
268 C ObjC Var(warn_int_to_pointer_cast) Init(1) Warning
269 Warn when there is a cast to a pointer from an integer of a different size
272 C++ ObjC++ Var(warn_invalid_offsetof) Init(1) Warning
273 Warn about invalid uses of the \"offsetof\" macro
276 C ObjC C++ ObjC++ Warning
277 Warn about PCH files that are found but not used
280 C ObjC C++ ObjC++ Var(warn_long_long) Init(1) Warning
281 Do not warn about using \"long long\" when -pedantic
284 C ObjC C++ ObjC++ Warning
285 Warn about suspicious declarations of \"main\"
288 C ObjC C++ ObjC++ Var(warn_missing_braces) Warning
289 Warn about possibly missing braces around initializers
291 Wmissing-declarations
292 C ObjC C++ ObjC++ Var(warn_missing_declarations) Warning
293 Warn about global functions without previous declarations
295 Wmissing-field-initializers
296 C ObjC C++ ObjC++ Var(warn_missing_field_initializers) Init(-1) Warning
297 Warn about missing fields in struct initializers
299 Wmissing-format-attribute
300 C ObjC C++ ObjC++ Var(warn_missing_format_attribute) Warning
301 Warn about functions which might be candidates for format attributes
303 Wmissing-include-dirs
304 C ObjC C++ ObjC++ Warning
305 Warn about user-specified include directories that do not exist
307 Wmissing-parameter-type
308 C ObjC Var(warn_missing_parameter_type) Init(-1) Warning
309 Warn about function parameters declared without a type specifier in K&R-style functions
312 C ObjC Var(warn_missing_prototypes) Warning
313 Warn about global functions without prototypes
316 C ObjC C++ ObjC++ Warning
317 Warn about use of multi-character character constants
320 C ObjC Var(warn_nested_externs) Warning
321 Warn about \"extern\" declarations not at file scope
324 C++ ObjC++ Var(warn_nontemplate_friend) Init(1) Warning
325 Warn when non-templatized friend functions are declared within a template
328 C++ ObjC++ Var(warn_nonvdtor) Warning
329 Warn about non-virtual destructors
332 C ObjC Var(warn_nonnull) Warning
333 Warn about NULL being passed to argument slots marked as requiring non-NULL
336 C ObjC C++ ObjC++ Joined Warning
337 -Wnormalized=<id|nfc|nfkc> Warn about non-normalised Unicode strings
340 C++ ObjC++ Var(warn_old_style_cast) Warning
341 Warn if a C-style cast is used in a program
343 Wold-style-declaration
344 C ObjC Var(warn_old_style_declaration) Init(-1) Warning
345 Warn for obsolescent usage in a declaration
347 Wold-style-definition
348 C ObjC Var(warn_old_style_definition) Warning
349 Warn if an old-style parameter definition is used
352 C ObjC C++ ObjC++ Var(warn_overlength_strings) Init(-1) Warning
353 Warn if a string is longer than the maximum portable length specified by the standard
356 C++ ObjC++ Var(warn_overloaded_virtual) Warning
357 Warn about overloaded virtual function names
360 C ObjC Var(warn_override_init) Init(-1) Warning
361 Warn about overriding initializers without side effects
364 C ObjC C++ ObjC++ Var(warn_parentheses) Warning
365 Warn about possibly missing parentheses
368 C++ ObjC++ Var(warn_pmf2ptr) Init(1) Warning
369 Warn when converting the type of pointers to member functions
372 C ObjC C++ ObjC++ Var(warn_pointer_arith) Warning
373 Warn about function pointer arithmetic
376 C ObjC Var(warn_pointer_to_int_cast) Init(1) Warning
377 Warn when a pointer is cast to an integer of a different size
380 C ObjC C++ ObjC++ Var(warn_pragmas) Init(1) Warning
381 Warn about misuses of pragmas
384 ObjC ObjC++ Var(warn_protocol) Init(1) Warning
385 Warn if inherited methods are unimplemented
388 C ObjC C++ ObjC++ Var(warn_redundant_decls) Warning
389 Warn about multiple declarations of the same object
392 C++ ObjC++ Var(warn_reorder) Warning
393 Warn when the compiler reorders code
396 C ObjC C++ ObjC++ Var(warn_return_type) Warning
397 Warn whenever a function's return type defaults to \"int\" (C), or about inconsistent return types (C++)
400 ObjC ObjC++ Var(warn_selector) Warning
401 Warn if a selector has multiple methods
404 C ObjC C++ ObjC++ Var(warn_sequence_point) Warning
405 Warn about possible violations of sequence point rules
408 C ObjC C++ ObjC++ Var(warn_sign_compare) Init(-1) Warning
409 Warn about signed-unsigned comparisons
412 C++ ObjC++ Var(warn_sign_promo) Warning
413 Warn when overload promotes from unsigned to signed
415 Wstrict-null-sentinel
417 Warn about uncasted NULL used as sentinel
420 C ObjC Var(warn_strict_prototypes) Warning
421 Warn about unprototyped function declarations
423 Wstrict-selector-match
424 ObjC ObjC++ Var(warn_strict_selector_match) Warning
425 Warn if type signatures of candidate methods do not match exactly
428 C++ ObjC++ Var(warn_synth) Warning
429 Deprecated. This switch has no effect
432 C ObjC C++ ObjC++ Warning
433 Do not suppress warnings from system headers
436 C ObjC Var(warn_traditional) Warning
437 Warn about features not present in traditional C
439 Wtraditional-conversion
440 C ObjC Var(warn_traditional_conversion) Warning
441 Warn of prototypes causing type conversions different from what would happen in the absence of prototype
444 C ObjC C++ ObjC++ Warning
445 Warn if trigraphs are encountered that might affect the meaning of the program
448 ObjC ObjC++ Var(warn_undeclared_selector) Warning
449 Warn about @selector()s without previously declared methods
452 C ObjC C++ ObjC++ Warning
453 Warn if an undefined macro is used in an #if directive
456 C ObjC C++ ObjC++ Warning
457 Warn about unrecognized pragmas
460 C ObjC C++ ObjC++ Warning
461 Warn about macros defined in the main file that are not used
464 C ObjC C++ ObjC++ Warning
465 Do not warn about using variadic macros when -pedantic
468 C ObjC C++ ObjC++ Var(warn_vla) Init(-1) Warning
469 Warn if a variable length array is used
471 Wvolatile-register-var
472 C ObjC C++ ObjC++ Var(warn_volatile_register_var) Warning
473 Warn when a register variable is declared volatile
476 C ObjC C++ ObjC++ Var(warn_write_strings) Warning
477 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.
480 C ObjC Var(warn_pointer_sign) Init(-1) Warning
481 Warn when a pointer differs in signedness in an assignment
485 A synonym for -std=c89 (for C) or -std=c++98 (for C++)
488 C ObjC C++ ObjC++ Joined
489 ; Documented in common.opt. FIXME - what about -dI, -dD, -dN and -dD?
493 Enforce class member access control semantics
498 falt-external-templates
500 Change when template instances are emitted
504 Recognize the \"asm\" keyword
508 Recognize built-in functions
511 C ObjC C++ ObjC++ Joined
515 Check the return value of new
519 Allow the arguments of the '?' operator to have different types
523 Reduce the size of object files
525 fconstant-string-class=
527 -fconst-string-class=<name> Use class <name> for constant strings
531 Inline member functions by default
535 Preprocess directives only.
537 fdollars-in-identifiers
539 Permit '$' as an identifier character
546 Generate code to check exception specifications
552 C ObjC C++ ObjC++ Joined RejectNegative
553 -fexec-charset=<cset> Convert all strings and character constants to character set <cset>
555 fextended-identifiers
557 Permit universal character names (\\u and \\U) in identifiers
560 C ObjC C++ ObjC++ Joined RejectNegative
561 -finput-charset=<cset> Specify the default character set for source files
569 Scope of for-init-statement variables is local to the loop
573 Do not assume that standard C libraries and \"main\" exist
577 Recognize GNU-defined keywords
581 Generate code for GNU runtime environment
584 C ObjC Var(flag_gnu89_inline) Init(-1)
585 Use traditional GNU semantics for inline functions
591 C++ ObjC++ Optimization
598 Assume normal C execution environment
602 Enable support for huge objects
606 Export functions even if they can be inlined
608 fimplicit-inline-templates
610 Emit implicit instantiations of inline templates
614 Emit implicit instantiations of templates
617 C++ ObjC++ Var(flag_friend_injection)
618 Inject friend functions into enclosing namespace
623 flax-vector-conversions
625 Allow implicit conversions between vectors with differing numbers of subparts and/or differing element types.
629 Don't warn about uses of Microsoft extensions
631 fname-mangling-version-
639 Generate code for NeXT (Apple Mac OS X) runtime environment
643 Assume that receivers of Objective-C messages may be nil
651 ; Generate special '- .cxx_construct' and '- .cxx_destruct' methods
652 ; to initialize any non-POD ivars in Objective-C++ classes.
653 fobjc-call-cxx-cdtors
654 ObjC++ Var(flag_objc_call_cxx_cdtors)
655 Generate special Objective-C methods to initialize/destroy non-POD C++ ivars, if needed
657 fobjc-direct-dispatch
658 ObjC ObjC++ Var(flag_objc_direct_dispatch)
659 Allow fast jumps to the message dispatcher
661 ; Nonzero means that we will allow new ObjC exception syntax (@throw,
662 ; @try, etc.) in source code.
664 ObjC ObjC++ Var(flag_objc_exceptions)
665 Enable Objective-C exception and synchronization syntax
668 ObjC ObjC++ Var(flag_objc_gc)
669 Enable garbage collection (GC) in Objective-C/Objective-C++ programs
671 ; Nonzero means that we generate NeXT setjmp based exceptions.
672 fobjc-sjlj-exceptions
673 ObjC ObjC++ Var(flag_objc_sjlj_exceptions) Init(-1)
674 Enable Objective-C setjmp exception handling runtime
677 C ObjC C++ ObjC++ Var(flag_openmp)
682 Recognize C++ keywords like \"compl\" and \"xor\"
686 Enable optional diagnostics
693 Look for and use PCH files even when preprocessing
697 Downgrade conformance errors to warnings
701 Treat the input file as already preprocessed
703 freplace-objc-classes
705 Used in Fix-and-Continue mode to indicate that object files may be swapped in at runtime
709 Enable automatic template instantiation
712 C++ ObjC++ Optimization
713 Generate run time type descriptor information
716 C ObjC C++ ObjC++ Optimization
717 Use the same size for double as for float
720 C ObjC C++ ObjC++ Optimization
721 Use the narrowest integer type possible for enumeration types
724 C ObjC C++ ObjC++ Optimization
725 Force the underlying type for \"wchar_t\" to be \"unsigned short\"
729 When \"signed\" or \"unsigned\" is not given make the bitfield signed
733 Make \"char\" signed by default
740 Display statistics accumulated during compilation
746 C ObjC C++ ObjC++ Joined RejectNegative UInteger
747 -ftabstop=<number> Distance between tab stops for column reporting
750 C++ ObjC++ Joined RejectNegative UInteger
751 -ftemplate-depth-<number> Specify maximum template instantiation depth
757 C++ ObjC++ Optimization
758 -fno-threadsafe-statics Do not generate thread-safe code for initializing local statics
762 When \"signed\" or \"unsigned\" is not given make the bitfield unsigned
766 Make \"char\" unsigned by default
770 Use __cxa_atexit to register destructors
772 fuse-cxa-get-exception-ptr
774 Use __cxa_get_exception_ptr in exception handling
776 fvisibility-inlines-hidden
778 Marks all inlined methods as having hidden visibility
780 fvisibility-ms-compat
781 C++ ObjC++ Var(flag_visibility_ms_compat)
782 Changes visibility to match Microsoft Visual Studio by default
786 Discard unused virtual functions
790 Implement vtables using thunks
794 Emit common-like symbols as weak symbols
797 C ObjC C++ ObjC++ Joined RejectNegative
798 -fwide-exec-charset=<cset> Convert all wide strings and character constants to character set <cset>
802 Generate a #line directive pointing at the current working directory
806 Emit cross referencing information
810 Generate lazy class lookup (via objc_getClass()) for use in Zero-Link mode
814 Dump declarations to a .decl file
816 femit-struct-debug-baseonly
818 -femit-struct-debug-baseonly Aggressive reduced debug info for structs
820 femit-struct-debug-reduced
822 -femit-struct-debug-reduced Conservative reduced debug info for structs
824 femit-struct-debug-detailed=
825 C ObjC C++ ObjC++ Joined
826 -femit-struct-debug-detailed=<spec-list> Detailed reduced debug info for structs
829 C ObjC C++ ObjC++ Joined Separate
830 -idirafter <dir> Add <dir> to the end of the system include path
833 C ObjC C++ ObjC++ Joined Separate
834 -imacros <file> Accept definition of macros in <file>
837 C ObjC C++ ObjC++ Joined Separate
838 -imultilib <dir> Set <dir> to be the multilib include subdirectory
841 C ObjC C++ ObjC++ Joined Separate
842 -include <file> Include the contents of <file> before other files
845 C ObjC C++ ObjC++ Joined Separate
846 -iprefix <path> Specify <path> as a prefix for next two options
849 C ObjC C++ ObjC++ Joined Separate
850 -isysroot <dir> Set <dir> to be the system root directory
853 C ObjC C++ ObjC++ Joined Separate
854 -isystem <dir> Add <dir> to the start of the system include path
857 C ObjC C++ ObjC++ Joined Separate
858 -iquote <dir> Add <dir> to the end of the quote include path
861 C ObjC C++ ObjC++ Joined Separate
862 -iwithprefix <dir> Add <dir> to the end of the system include path
865 C ObjC C++ ObjC++ Joined Separate
866 -iwithprefixbefore <dir> Add <dir> to the end of the main include path
872 C ObjC C++ ObjC++ Undocumented
876 Do not search standard system include directories (those specified with -isystem will still be used)
880 Do not search standard system include directories for C++
883 C ObjC C++ ObjC++ Joined Separate
884 ; Documented in common.opt
888 ; Documented in common.opt
892 ; Documented in common.opt
894 print-objc-runtime-info
896 Generate C header of platform-specific features
900 Print a checksum of the executable for PCH validity checking, and stop
904 Remap file names when including files
908 Conform to the ISO 1998 C++ standard
912 Conform to the ISO 1998 C++ standard, with extensions that are likely to
913 become a part of the upcoming ISO C++ standard, dubbed C++0x. Note that the
914 extensions enabled by this mode are experimental and may be removed in
915 future releases of GCC.
919 Conform to the ISO 1990 C standard
923 Conform to the ISO 1999 C standard
927 Deprecated in favor of -std=c99
931 Conform to the ISO 1998 C++ standard with GNU extensions
935 Conform to the ISO 1998 C++ standard, with GNU extensions and
936 extensions that are likely to become a part of the upcoming ISO C++
937 standard, dubbed C++0x. Note that the extensions enabled by this mode
938 are experimental and may be removed in future releases of GCC.
942 Conform to the ISO 1990 C standard with GNU extensions
946 Conform to the ISO 1999 C standard with GNU extensions
950 Deprecated in favor of -std=gnu99
954 Conform to the ISO 1990 C standard
958 Conform to the ISO 1990 C standard as amended in 1994
962 Conform to the ISO 1999 C standard
966 Deprecated in favor of -std=iso9899:1999
970 Enable traditional preprocessing
974 -trigraphs Support ISO C trigraphs
978 Do not predefine system-specific and GCC-specific macros
981 Common C ObjC C++ ObjC++
982 Enable verbose output
986 ; Documented in common.opt
988 ; This comment is to ensure we retain the blank line above.