1 ; Options for the C, ObjC, C++ and ObjC++ front ends.
2 ; Copyright (C) 2003, 2004, 2005, 2006 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 2, 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 COPYING. If not, write to the Free
18 ; Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
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++ Joined Separate
41 C ObjC C++ ObjC++ Joined Separate
42 -A<question>=<answer> Assert the <answer> to <question>. Putting '-' before <question> disables the <answer> to <question>
46 Do not discard comments
50 Do not discard comments in macro expansions
53 C ObjC C++ ObjC++ Joined Separate
54 -D<macro>[=<val>] Define a <macro> with <val> as its value. If just <macro> is given, <val> is taken to be 1
57 C ObjC C++ ObjC++ Undocumented
60 C ObjC C++ ObjC++ Joined Separate
61 -F <dir> Add <dir> to the end of the main framework include path
65 Print the name of header files as they are used
68 C ObjC C++ ObjC++ Joined Separate
69 -I <dir> Add <dir> to the end of the main include path
73 Generate make dependencies
76 C ObjC C++ ObjC++ Separate
77 Generate make dependencies and compile
80 C ObjC C++ ObjC++ Joined Separate
81 -MF <file> Write dependency output to the given file
85 Treat missing header files as generated files
89 Like -M but ignore system header files
92 C ObjC C++ ObjC++ Separate
93 Like -MD but ignore system header files
97 Generate phony targets for all headers
100 C ObjC C++ ObjC++ Joined Separate
101 -MQ <target> Add a MAKE-quoted target
104 C ObjC C++ ObjC++ Joined Separate
105 -MT <target> Add an unquoted target
109 Do not generate #line directives
112 C ObjC C++ ObjC++ Joined Separate
113 -U<macro> Undefine <macro>
116 C++ ObjC++ Var(warn_abi)
117 Warn about things that will change when compiling with an ABI-compliant compiler
121 Enable most warning messages
124 ObjC ObjC++ Var(warn_assign_intercept)
125 Warn whenever an Objective-C assignment is being intercepted by the garbage collector
128 C ObjC Var(warn_bad_function_cast)
129 Warn about casting functions to incompatible types
132 C Var(warn_cxx_compat)
133 Warn about C constructs that are not in the common subset of C and C++
137 C ObjC C++ ObjC++ Var(warn_cast_qual)
138 Warn about casts which discard qualifiers
141 C ObjC C++ ObjC++ Var(warn_char_subscripts)
142 Warn about subscripts whose type is \"char\"
145 C ObjC C++ ObjC++ Var(warn_clobbered) Init(-1)
146 Warn about variables that might be changed by \"longjmp\" or \"vfork\"
150 Warn about possibly nested block comments, and C++ comments spanning more than one physical line
154 Synonym for -Wcomment
157 C ObjC C++ ObjC++ Var(warn_conversion)
158 Warn for implicit type conversions that may change a value
161 C++ ObjC++ Var(warn_ctor_dtor_privacy)
162 Warn when all constructors and destructors are private
164 Wdeclaration-after-statement
165 C ObjC Var(warn_declaration_after_statement)
166 Warn when a declaration is found after a statement
169 C++ ObjC++ Var(warn_deprecated) Init(1)
170 Warn about deprecated compiler features
173 C ObjC C++ Var(warn_div_by_zero) Init(1)
174 Warn about compile-time integer division by zero
177 C++ ObjC++ Var(warn_ecpp)
178 Warn about violations of Effective C++ style rules
181 C ObjC C++ ObjC++ Var(warn_empty_body) Init(-1)
182 Warn about an empty body in an if or else statement
186 Warn about stray tokens after #elif and #endif
190 ; Documented in common.opt
192 Werror-implicit-function-declaration
193 C ObjC RejectNegative
194 Make implicit function declarations an error
197 C ObjC C++ ObjC++ Var(warn_float_equal)
198 Warn if testing floating point numbers for equality
202 Warn about printf/scanf/strftime/strfmon format string anomalies
205 C ObjC C++ ObjC++ Var(warn_format_extra_args)
206 Warn if passing too many arguments to a function for its format string
209 C ObjC C++ ObjC++ Var(warn_format_nonliteral)
210 Warn about format strings that are not literals
213 C ObjC C++ ObjC++ Var(warn_format_security)
214 Warn about possible security problems with format functions
217 C ObjC C++ ObjC++ Var(warn_format_y2k)
218 Warn about strftime formats yielding 2-digit years
221 C ObjC Var(warn_format_zero_length)
222 Warn about zero-length formats
225 C ObjC C++ ObjC++ Joined
228 C ObjC C++ ObjC++ Var(warn_init_self)
229 Warn about variables which are initialized to themselves
234 Wimplicit-function-declaration
235 C ObjC Var(mesg_implicit_function_declaration) Init(-1)
236 Warn about implicit function declarations
239 C ObjC Var(warn_implicit_int)
240 Warn when a declaration does not specify a type
244 Deprecated. This switch has no effect
247 C ObjC Var(warn_int_to_pointer_cast) Init(1)
248 Warn when there is a cast to a pointer from an integer of a different size
251 C++ ObjC++ Var(warn_invalid_offsetof) Init(1)
252 Warn about invalid uses of the \"offsetof\" macro
256 Warn about PCH files that are found but not used
259 C ObjC C++ ObjC++ Var(warn_long_long) Init(1)
260 Do not warn about using \"long long\" when -pedantic
264 Warn about suspicious declarations of \"main\"
267 C ObjC C++ ObjC++ Var(warn_missing_braces)
268 Warn about possibly missing braces around initializers
270 Wmissing-declarations
271 C ObjC C++ ObjC++ Var(warn_missing_declarations)
272 Warn about global functions without previous declarations
274 Wmissing-field-initializers
275 C ObjC C++ ObjC++ Var(warn_missing_field_initializers) Init(-1)
276 Warn about missing fields in struct initializers
278 Wmissing-format-attribute
279 C ObjC C++ ObjC++ Var(warn_missing_format_attribute)
280 Warn about functions which might be candidates for format attributes
282 Wmissing-include-dirs
284 Warn about user-specified include directories that do not exist
287 C ObjC Var(warn_missing_prototypes)
288 Warn about global functions without prototypes
292 Warn about use of multi-character character constants
295 C ObjC Var(warn_nested_externs)
296 Warn about \"extern\" declarations not at file scope
299 C++ ObjC++ Var(warn_nontemplate_friend) Init(1)
300 Warn when non-templatized friend functions are declared within a template
303 C++ ObjC++ Var(warn_nonvdtor)
304 Warn about non-virtual destructors
307 C ObjC Var(warn_nonnull)
308 Warn about NULL being passed to argument slots marked as requiring non-NULL
311 C ObjC C++ ObjC++ Joined
312 -Wnormalized=<id|nfc|nfkc> Warn about non-normalised Unicode strings
315 C++ ObjC++ Var(warn_old_style_cast)
316 Warn if a C-style cast is used in a program
318 Wold-style-definition
319 C ObjC Var(warn_old_style_definition)
320 Warn if an old-style parameter definition is used
323 C ObjC C++ ObjC++ Var(warn_overlength_strings) Init(-1)
324 Warn if a string is longer than the maximum portable length specified by the standard
327 C++ ObjC++ Var(warn_overloaded_virtual)
328 Warn about overloaded virtual function names
331 C ObjC Var(warn_override_init) Init(-1)
332 Warn about overriding initializers without side effects
335 C ObjC C++ ObjC++ Var(warn_parentheses)
336 Warn about possibly missing parentheses
339 C++ ObjC++ Var(warn_pmf2ptr) Init(1)
340 Warn when converting the type of pointers to member functions
343 C ObjC C++ ObjC++ Var(warn_pointer_arith)
344 Warn about function pointer arithmetic
347 C ObjC Var(warn_pointer_to_int_cast) Init(1)
348 Warn when a pointer is cast to an integer of a different size
351 C ObjC C++ ObjC++ Var(warn_pragmas) Init(1)
352 Warn about misuses of pragmas
355 ObjC ObjC++ Var(warn_protocol) Init(1)
356 Warn if inherited methods are unimplemented
359 C ObjC C++ ObjC++ Var(warn_redundant_decls)
360 Warn about multiple declarations of the same object
363 C++ ObjC++ Var(warn_reorder)
364 Warn when the compiler reorders code
367 C ObjC C++ ObjC++ Var(warn_return_type)
368 Warn whenever a function's return type defaults to \"int\" (C), or about inconsistent return types (C++)
371 ObjC ObjC++ Var(warn_selector)
372 Warn if a selector has multiple methods
375 C ObjC C++ ObjC++ Var(warn_sequence_point)
376 Warn about possible violations of sequence point rules
379 C ObjC C++ ObjC++ Var(warn_sign_compare) Init(-1)
380 Warn about signed-unsigned comparisons
383 C++ ObjC++ Var(warn_sign_promo)
384 Warn when overload promotes from unsigned to signed
386 Wstrict-null-sentinel
388 Warn about uncasted NULL used as sentinel
391 C ObjC Var(warn_strict_prototypes)
392 Warn about unprototyped function declarations
394 Wstrict-selector-match
395 ObjC ObjC++ Var(warn_strict_selector_match)
396 Warn if type signatures of candidate methods do not match exactly
399 C++ ObjC++ Var(warn_synth)
400 Warn when synthesis behavior differs from Cfront
404 Do not suppress warnings from system headers
407 C ObjC Var(warn_traditional)
408 Warn about features not present in traditional C
410 Wtraditional-conversion
411 C ObjC Var(warn_traditional_conversion)
412 Warn of prototypes causing type conversions different from what would happen in the absence of prototype
416 Warn if trigraphs are encountered that might affect the meaning of the program
419 ObjC ObjC++ Var(warn_undeclared_selector)
420 Warn about @selector()s without previously declared methods
424 Warn if an undefined macro is used in an #if directive
428 Warn about unrecognized pragmas
432 Warn about macros defined in the main file that are not used
436 Do not warn about using variadic macros when -pedantic
439 C ObjC C++ ObjC++ Var(warn_write_strings)
440 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.
443 C ObjC Var(warn_pointer_sign) Init(-1)
444 Warn when a pointer differs in signedness in an assignment
448 A synonym for -std=c89 (for C) or -std=c++98 (for C++)
451 C ObjC C++ ObjC++ Joined
452 ; Documented in common.opt. FIXME - what about -dI, -dD, -dN and -dD?
456 Enforce class member access control semantics
461 falt-external-templates
463 Change when template instances are emitted
467 Recognize the \"asm\" keyword
471 Recognize built-in functions
474 C ObjC C++ ObjC++ Joined
478 Check the return value of new
482 Allow the arguments of the '?' operator to have different types
486 Reduce the size of object files
488 fconstant-string-class=
490 -fconst-string-class=<name> Use class <name> for constant strings
494 Inline member functions by default
496 fdollars-in-identifiers
498 Permit '$' as an identifier character
505 Generate code to check exception specifications
511 C ObjC C++ ObjC++ Joined RejectNegative
512 -fexec-charset=<cset> Convert all strings and character constants to character set <cset>
514 fextended-identifiers
516 Permit universal character names (\\u and \\U) in identifiers
519 C ObjC C++ ObjC++ Joined RejectNegative
520 -finput-charset=<cset> Specify the default character set for source files
528 Scope of for-init-statement variables is local to the loop
532 Do not assume that standard C libraries and \"main\" exist
536 Recognize GNU-defined keywords
540 Generate code for GNU runtime environment
553 Assume normal C execution environment
557 Enable support for huge objects
561 Export functions even if they can be inlined
563 fimplicit-inline-templates
565 Emit implicit instantiations of inline templates
569 Emit implicit instantiations of templates
572 C++ Var(flag_friend_injection)
573 Inject friend functions into enclosing namespace
580 Don't warn about uses of Microsoft extensions
582 fname-mangling-version-
590 Generate code for NeXT (Apple Mac OS X) runtime environment
594 Assume that receivers of Objective-C messages may be nil
602 ; Generate special '- .cxx_construct' and '- .cxx_destruct' methods
603 ; to initialize any non-POD ivars in Objective-C++ classes.
604 fobjc-call-cxx-cdtors
605 ObjC++ Var(flag_objc_call_cxx_cdtors)
606 Generate special Objective-C methods to initialize/destroy non-POD C++ ivars, if needed
608 fobjc-direct-dispatch
609 ObjC ObjC++ Var(flag_objc_direct_dispatch)
610 Allow fast jumps to the message dispatcher
612 ; Nonzero means that we will allow new ObjC exception syntax (@throw,
613 ; @try, etc.) in source code.
615 ObjC ObjC++ Var(flag_objc_exceptions)
616 Enable Objective-C exception and synchronization syntax
619 ObjC ObjC++ Var(flag_objc_gc)
620 Enable garbage collection (GC) in Objective-C/Objective-C++ programs
622 ; Nonzero means that we generate NeXT setjmp based exceptions.
623 fobjc-sjlj-exceptions
624 ObjC ObjC++ Var(flag_objc_sjlj_exceptions) Init(-1)
625 Enable Objective-C setjmp exception handling runtime
628 C ObjC C++ ObjC++ Var(flag_openmp)
633 Recognize C++ kewords like \"compl\" and \"xor\"
637 Enable optional diagnostics
644 Look for and use PCH files even when preprocessing
648 Downgrade conformance errors to warnings
652 Treat the input file as already preprocessed
654 freplace-objc-classes
656 Used in Fix-and-Continue mode to indicate that object files may be swapped in at runtime
660 Enable automatic template instantiation
664 Generate run time type descriptor information
668 Use the same size for double as for float
672 Use the narrowest integer type possible for enumeration types
676 Force the underlying type for \"wchar_t\" to be \"unsigned short\"
680 When \"signed\" or \"unsigned\" is not given make the bitfield signed
684 Make \"char\" signed by default
691 Display statistics accumulated during compilation
697 C ObjC C++ ObjC++ Joined RejectNegative UInteger
698 -ftabstop=<number> Distance between tab stops for column reporting
701 C++ ObjC++ Joined RejectNegative UInteger
702 -ftemplate-depth-<number> Specify maximum template instantiation depth
709 -fno-threadsafe-statics Do not generate thread-safe code for initializing local statics
713 When \"signed\" or \"unsigned\" is not given make the bitfield unsigned
717 Make \"char\" unsigned by default
721 Use __cxa_atexit to register destructors
723 fuse-cxa-get-exception-ptr
725 Use __cxa_get_exception_ptr in exception handling
727 fvisibility-inlines-hidden
729 Marks all inlined methods as having hidden visibility
733 Discard unused virtual functions
737 Implement vtables using thunks
741 Emit common-like symbols as weak symbols
744 C ObjC C++ ObjC++ Joined RejectNegative
745 -fwide-exec-charset=<cset> Convert all wide strings and character constants to character set <cset>
749 Generate a #line directive pointing at the current working directory
753 Emit cross referencing information
757 Generate lazy class lookup (via objc_getClass()) for use in Zero-Link mode
761 Dump declarations to a .decl file
764 C ObjC C++ ObjC++ Joined Separate
765 -idirafter <dir> Add <dir> to the end of the system include path
768 C ObjC C++ ObjC++ Joined Separate
769 -imacros <file> Accept definition of macros in <file>
772 C ObjC C++ ObjC++ Joined Separate
773 -imultilib <dir> Set <dir> to be the multilib include subdirectory
776 C ObjC C++ ObjC++ Joined Separate
777 -include <file> Include the contents of <file> before other files
780 C ObjC C++ ObjC++ Joined Separate
781 -iprefix <path> Specify <path> as a prefix for next two options
784 C ObjC C++ ObjC++ Joined Separate
785 -isysroot <dir> Set <dir> to be the system root directory
788 C ObjC C++ ObjC++ Joined Separate
789 -isystem <dir> Add <dir> to the start of the system include path
792 C ObjC C++ ObjC++ Joined Separate
793 -iquote <dir> Add <dir> to the end of the quote include path
796 C ObjC C++ ObjC++ Joined Separate
797 -iwithprefix <dir> Add <dir> to the end of the system include path
800 C ObjC C++ ObjC++ Joined Separate
801 -iwithprefixbefore <dir> Add <dir> to the end of the main include path
810 C ObjC C++ ObjC++ Undocumented
814 Do not search standard system include directories (those specified with -isystem will still be used)
818 Do not search standard system include directories for C++
821 C ObjC C++ ObjC++ Joined Separate
822 ; Documented in common.opt
826 ; Documented in common.opt
830 ; Documented in common.opt
832 print-objc-runtime-info
834 Generate C header of platform-specific features
838 Print a checksum of the executable for PCH validity checking, and stop
842 Remap file names when including files
846 Conform to the ISO 1998 C++ standard
850 Conform to the ISO 1998 C++ standard, with extensions that are likely to
851 become a part of the upcoming ISO C++ standard, dubbed C++0x. Note that the
852 extensions enabled by this mode are experimental and may be removed in
853 future releases of GCC.
857 Conform to the ISO 1990 C standard
861 Conform to the ISO 1999 C standard
865 Deprecated in favor of -std=c99
869 Conform to the ISO 1998 C++ standard with GNU extensions
873 Conform to the ISO 1998 C++ standard, with GNU extensions and
874 extensions that are likely to become a part of the upcoming ISO C++
875 standard, dubbed C++0x. Note that the extensions enabled by this mode
876 are experimental and may be removed in future releases of GCC.
880 Conform to the ISO 1990 C standard with GNU extensions
884 Conform to the ISO 1999 C standard with GNU extensions
888 Deprecated in favor of -std=gnu99
892 Conform to the ISO 1990 C standard
896 Conform to the ISO 1990 C standard as amended in 1994
900 Conform to the ISO 1999 C standard
904 Deprecated in favor of -std=iso9899:1999
908 Enable traditional preprocessing
912 -trigraphs Support ISO C trigraphs
916 Do not predefine system-specific and GCC-specific macros
920 Enable verbose output
924 ; Documented in common.opt
926 ; This comment is to ensure we retain the blank line above.