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 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) Warning
117 Warn about things that will change when compiling with an ABI-compliant compiler
120 C ObjC C++ ObjC++ Var(warn_address) Warning
121 Warn about suspicious uses of memory addresses
124 C ObjC C++ ObjC++ Warning
125 Enable most warning messages
128 ObjC ObjC++ Var(warn_assign_intercept) Warning
129 Warn whenever an Objective-C assignment is being intercepted by the garbage collector
132 C ObjC Var(warn_bad_function_cast) Warning
133 Warn about casting functions to incompatible types
136 C ObjC Var(warn_cxx_compat) Warning
137 Warn about C constructs that are not in the common subset of C and C++
140 C++ ObjC++ Var(warn_cxx0x_compat) Warning
141 Warn about C++ constructs whose meaning differs between ISO C++ 1998 and ISO C++ 200x
144 C ObjC C++ ObjC++ Var(warn_cast_qual) Warning
145 Warn about casts which discard qualifiers
148 C ObjC C++ ObjC++ Var(warn_char_subscripts) Warning
149 Warn about subscripts whose type is \"char\"
152 C ObjC C++ ObjC++ Var(warn_clobbered) Init(-1) Warning
153 Warn about variables that might be changed by \"longjmp\" or \"vfork\"
156 C ObjC C++ ObjC++ Warning
157 Warn about possibly nested block comments, and C++ comments spanning more than one physical line
160 C ObjC C++ ObjC++ Warning
161 Synonym for -Wcomment
164 C ObjC C++ ObjC++ Var(warn_conversion) Warning
165 Warn for implicit type conversions that may change a value
168 C++ ObjC++ Var(warn_ctor_dtor_privacy) Warning
169 Warn when all constructors and destructors are private
171 Wdeclaration-after-statement
172 C ObjC Var(warn_declaration_after_statement) Warning
173 Warn when a declaration is found after a statement
176 C++ ObjC++ Var(warn_deprecated) Init(1) Warning
177 Warn about deprecated compiler features
180 C ObjC C++ ObjC++ Var(warn_div_by_zero) Init(1) Warning
181 Warn about compile-time integer division by zero
184 C++ ObjC++ Var(warn_ecpp) Warning
185 Warn about violations of Effective C++ style rules
188 C ObjC C++ ObjC++ Var(warn_empty_body) Init(-1) Warning
189 Warn about an empty body in an if or else statement
192 C ObjC C++ ObjC++ Warning
193 Warn about stray tokens after #elif and #endif
197 ; Documented in common.opt
199 Werror-implicit-function-declaration
200 C ObjC RejectNegative Warning
201 This switch is deprecated; use -Werror=implicit-function-declaration instead
204 C ObjC C++ ObjC++ Var(warn_float_equal) Warning
205 Warn if testing floating point numbers for equality
208 C ObjC C++ ObjC++ Warning
209 Warn about printf/scanf/strftime/strfmon format string anomalies
212 C ObjC C++ ObjC++ Var(warn_format_extra_args) Warning
213 Warn if passing too many arguments to a function for its format string
216 C ObjC C++ ObjC++ Var(warn_format_nonliteral) Warning
217 Warn about format strings that are not literals
220 C ObjC C++ ObjC++ Var(warn_format_contains_nul) Warning
221 Warn about format strings that contain NUL bytes
224 C ObjC C++ ObjC++ Var(warn_format_security) Warning
225 Warn about possible security problems with format functions
228 C ObjC C++ ObjC++ Var(warn_format_y2k) Warning
229 Warn about strftime formats yielding 2-digit years
232 C ObjC Var(warn_format_zero_length) Warning
233 Warn about zero-length formats
236 C ObjC C++ ObjC++ Joined Warning
239 C ObjC C++ ObjC++ Var(warn_init_self) Warning
240 Warn about variables which are initialized to themselves
243 C ObjC C++ ObjC++ Warning
245 Wimplicit-function-declaration
246 C ObjC Var(warn_implicit_function_declaration) Init(-1) Warning
247 Warn about implicit function declarations
250 C ObjC Var(warn_implicit_int) Warning
251 Warn when a declaration does not specify a type
255 Deprecated. This switch has no effect
258 C ObjC Var(warn_int_to_pointer_cast) Init(1) Warning
259 Warn when there is a cast to a pointer from an integer of a different size
262 C++ ObjC++ Var(warn_invalid_offsetof) Init(1) Warning
263 Warn about invalid uses of the \"offsetof\" macro
266 C ObjC C++ ObjC++ Warning
267 Warn about PCH files that are found but not used
270 C ObjC C++ ObjC++ Var(warn_long_long) Init(1) Warning
271 Do not warn about using \"long long\" when -pedantic
275 Warn about suspicious declarations of \"main\"
278 C ObjC C++ ObjC++ Var(warn_missing_braces) Warning
279 Warn about possibly missing braces around initializers
281 Wmissing-declarations
282 C ObjC C++ ObjC++ Var(warn_missing_declarations) Warning
283 Warn about global functions without previous declarations
285 Wmissing-field-initializers
286 C ObjC C++ ObjC++ Var(warn_missing_field_initializers) Init(-1) Warning
287 Warn about missing fields in struct initializers
289 Wmissing-format-attribute
290 C ObjC C++ ObjC++ Var(warn_missing_format_attribute) Warning
291 Warn about functions which might be candidates for format attributes
293 Wmissing-include-dirs
294 C ObjC C++ ObjC++ Warning
295 Warn about user-specified include directories that do not exist
297 Wmissing-parameter-type
298 C ObjC Var(warn_missing_parameter_type) Init(-1) Warning
299 Warn about function parameters declared without a type specifier in K&R-style functions
302 C ObjC Var(warn_missing_prototypes) Warning
303 Warn about global functions without prototypes
306 C ObjC C++ ObjC++ Warning
307 Warn about use of multi-character character constants
310 C ObjC Var(warn_nested_externs) Warning
311 Warn about \"extern\" declarations not at file scope
314 C++ ObjC++ Var(warn_nontemplate_friend) Init(1) Warning
315 Warn when non-templatized friend functions are declared within a template
318 C++ ObjC++ Var(warn_nonvdtor) Warning
319 Warn about non-virtual destructors
322 C ObjC Var(warn_nonnull) Warning
323 Warn about NULL being passed to argument slots marked as requiring non-NULL
326 C ObjC C++ ObjC++ Joined Warning
327 -Wnormalized=<id|nfc|nfkc> Warn about non-normalised Unicode strings
330 C++ ObjC++ Var(warn_old_style_cast) Warning
331 Warn if a C-style cast is used in a program
333 Wold-style-declaration
334 C ObjC Var(warn_old_style_declaration) Init(-1) Warning
335 Warn for obsolescent usage in a declaration
337 Wold-style-definition
338 C ObjC Var(warn_old_style_definition) Warning
339 Warn if an old-style parameter definition is used
342 C ObjC C++ ObjC++ Var(warn_overlength_strings) Init(-1) Warning
343 Warn if a string is longer than the maximum portable length specified by the standard
346 C++ ObjC++ Var(warn_overloaded_virtual) Warning
347 Warn about overloaded virtual function names
350 C ObjC Var(warn_override_init) Init(-1) Warning
351 Warn about overriding initializers without side effects
354 C ObjC C++ ObjC++ Var(warn_parentheses) Warning
355 Warn about possibly missing parentheses
358 C++ ObjC++ Var(warn_pmf2ptr) Init(1) Warning
359 Warn when converting the type of pointers to member functions
362 C ObjC C++ ObjC++ Var(warn_pointer_arith) Warning
363 Warn about function pointer arithmetic
366 C ObjC Var(warn_pointer_to_int_cast) Init(1) Warning
367 Warn when a pointer is cast to an integer of a different size
370 C ObjC C++ ObjC++ Var(warn_pragmas) Init(1) Warning
371 Warn about misuses of pragmas
374 ObjC ObjC++ Var(warn_protocol) Init(1) Warning
375 Warn if inherited methods are unimplemented
378 C ObjC C++ ObjC++ Var(warn_redundant_decls) Warning
379 Warn about multiple declarations of the same object
382 C++ ObjC++ Var(warn_reorder) Warning
383 Warn when the compiler reorders code
386 C ObjC C++ ObjC++ Var(warn_return_type) Warning
387 Warn whenever a function's return type defaults to \"int\" (C), or about inconsistent return types (C++)
390 ObjC ObjC++ Var(warn_selector) Warning
391 Warn if a selector has multiple methods
394 C ObjC C++ ObjC++ Var(warn_sequence_point) Warning
395 Warn about possible violations of sequence point rules
398 C ObjC C++ ObjC++ Var(warn_sign_compare) Init(-1) Warning
399 Warn about signed-unsigned comparisons
402 C++ ObjC++ Var(warn_sign_promo) Warning
403 Warn when overload promotes from unsigned to signed
405 Wstrict-null-sentinel
407 Warn about uncasted NULL used as sentinel
410 C ObjC Var(warn_strict_prototypes) Warning
411 Warn about unprototyped function declarations
413 Wstrict-selector-match
414 ObjC ObjC++ Var(warn_strict_selector_match) Warning
415 Warn if type signatures of candidate methods do not match exactly
418 C++ ObjC++ Var(warn_synth) Warning
419 Warn when synthesis behavior differs from Cfront
422 C ObjC C++ ObjC++ Warning
423 Do not suppress warnings from system headers
426 C ObjC Var(warn_traditional) Warning
427 Warn about features not present in traditional C
429 Wtraditional-conversion
430 C ObjC Var(warn_traditional_conversion) Warning
431 Warn of prototypes causing type conversions different from what would happen in the absence of prototype
434 C ObjC C++ ObjC++ Warning
435 Warn if trigraphs are encountered that might affect the meaning of the program
438 ObjC ObjC++ Var(warn_undeclared_selector) Warning
439 Warn about @selector()s without previously declared methods
442 C ObjC C++ ObjC++ Warning
443 Warn if an undefined macro is used in an #if directive
446 C ObjC C++ ObjC++ Warning
447 Warn about unrecognized pragmas
450 C ObjC C++ ObjC++ Warning
451 Warn about macros defined in the main file that are not used
454 C ObjC C++ ObjC++ Warning
455 Do not warn about using variadic macros when -pedantic
458 C ObjC C++ ObjC++ Var(warn_vla) Init(-1) Warning
459 Warn if a variable length array is used
462 C ObjC C++ ObjC++ Var(warn_write_strings) Warning
463 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.
466 C ObjC Var(warn_pointer_sign) Init(-1) Warning
467 Warn when a pointer differs in signedness in an assignment
471 A synonym for -std=c89 (for C) or -std=c++98 (for C++)
474 C ObjC C++ ObjC++ Joined
475 ; Documented in common.opt. FIXME - what about -dI, -dD, -dN and -dD?
479 Enforce class member access control semantics
484 falt-external-templates
486 Change when template instances are emitted
490 Recognize the \"asm\" keyword
494 Recognize built-in functions
497 C ObjC C++ ObjC++ Joined
501 Check the return value of new
505 Allow the arguments of the '?' operator to have different types
509 Reduce the size of object files
511 fconstant-string-class=
513 -fconst-string-class=<name> Use class <name> for constant strings
517 Inline member functions by default
519 fdollars-in-identifiers
521 Permit '$' as an identifier character
528 Generate code to check exception specifications
534 C ObjC C++ ObjC++ Joined RejectNegative
535 -fexec-charset=<cset> Convert all strings and character constants to character set <cset>
537 fextended-identifiers
539 Permit universal character names (\\u and \\U) in identifiers
542 C ObjC C++ ObjC++ Joined RejectNegative
543 -finput-charset=<cset> Specify the default character set for source files
551 Scope of for-init-statement variables is local to the loop
555 Do not assume that standard C libraries and \"main\" exist
559 Recognize GNU-defined keywords
563 Generate code for GNU runtime environment
566 C ObjC Var(flag_gnu89_inline) Init(-1)
567 Use traditional GNU semantics for inline functions
573 C++ ObjC++ Optimization
580 Assume normal C execution environment
584 Enable support for huge objects
588 Export functions even if they can be inlined
590 fimplicit-inline-templates
592 Emit implicit instantiations of inline templates
596 Emit implicit instantiations of templates
599 C++ ObjC++ Var(flag_friend_injection)
600 Inject friend functions into enclosing namespace
605 flax-vector-conversions
607 Allow implicit conversions between vectors with differing numbers of subparts and/or differing element types.
611 Don't warn about uses of Microsoft extensions
613 fname-mangling-version-
621 Generate code for NeXT (Apple Mac OS X) runtime environment
625 Assume that receivers of Objective-C messages may be nil
633 ; Generate special '- .cxx_construct' and '- .cxx_destruct' methods
634 ; to initialize any non-POD ivars in Objective-C++ classes.
635 fobjc-call-cxx-cdtors
636 ObjC++ Var(flag_objc_call_cxx_cdtors)
637 Generate special Objective-C methods to initialize/destroy non-POD C++ ivars, if needed
639 fobjc-direct-dispatch
640 ObjC ObjC++ Var(flag_objc_direct_dispatch)
641 Allow fast jumps to the message dispatcher
643 ; Nonzero means that we will allow new ObjC exception syntax (@throw,
644 ; @try, etc.) in source code.
646 ObjC ObjC++ Var(flag_objc_exceptions)
647 Enable Objective-C exception and synchronization syntax
650 ObjC ObjC++ Var(flag_objc_gc)
651 Enable garbage collection (GC) in Objective-C/Objective-C++ programs
653 ; Nonzero means that we generate NeXT setjmp based exceptions.
654 fobjc-sjlj-exceptions
655 ObjC ObjC++ Var(flag_objc_sjlj_exceptions) Init(-1)
656 Enable Objective-C setjmp exception handling runtime
659 C ObjC C++ ObjC++ Var(flag_openmp)
664 Recognize C++ kewords like \"compl\" and \"xor\"
668 Enable optional diagnostics
675 Look for and use PCH files even when preprocessing
679 Downgrade conformance errors to warnings
683 Treat the input file as already preprocessed
685 freplace-objc-classes
687 Used in Fix-and-Continue mode to indicate that object files may be swapped in at runtime
691 Enable automatic template instantiation
694 C++ ObjC++ Optimization
695 Generate run time type descriptor information
698 C ObjC C++ ObjC++ Optimization
699 Use the same size for double as for float
702 C ObjC C++ ObjC++ Optimization
703 Use the narrowest integer type possible for enumeration types
706 C ObjC C++ ObjC++ Optimization
707 Force the underlying type for \"wchar_t\" to be \"unsigned short\"
711 When \"signed\" or \"unsigned\" is not given make the bitfield signed
715 Make \"char\" signed by default
722 Display statistics accumulated during compilation
728 C ObjC C++ ObjC++ Joined RejectNegative UInteger
729 -ftabstop=<number> Distance between tab stops for column reporting
732 C++ ObjC++ Joined RejectNegative UInteger
733 -ftemplate-depth-<number> Specify maximum template instantiation depth
739 C++ ObjC++ Optimization
740 -fno-threadsafe-statics Do not generate thread-safe code for initializing local statics
744 When \"signed\" or \"unsigned\" is not given make the bitfield unsigned
748 Make \"char\" unsigned by default
752 Use __cxa_atexit to register destructors
754 fuse-cxa-get-exception-ptr
756 Use __cxa_get_exception_ptr in exception handling
758 fvisibility-inlines-hidden
760 Marks all inlined methods as having hidden visibility
764 Discard unused virtual functions
768 Implement vtables using thunks
772 Emit common-like symbols as weak symbols
775 C ObjC C++ ObjC++ Joined RejectNegative
776 -fwide-exec-charset=<cset> Convert all wide strings and character constants to character set <cset>
780 Generate a #line directive pointing at the current working directory
784 Emit cross referencing information
788 Generate lazy class lookup (via objc_getClass()) for use in Zero-Link mode
792 Dump declarations to a .decl file
794 femit-struct-debug-baseonly
796 -femit-struct-debug-baseonly Aggressive reduced debug info for structs
798 femit-struct-debug-reduced
800 -femit-struct-debug-reduced Conservative reduced debug info for structs
802 femit-struct-debug-detailed=
803 C ObjC C++ ObjC++ Joined
804 -femit-struct-debug-detailed=<spec-list> Detailed reduced debug info for structs
807 C ObjC C++ ObjC++ Joined Separate
808 -idirafter <dir> Add <dir> to the end of the system include path
811 C ObjC C++ ObjC++ Joined Separate
812 -imacros <file> Accept definition of macros in <file>
815 C ObjC C++ ObjC++ Joined Separate
816 -imultilib <dir> Set <dir> to be the multilib include subdirectory
819 C ObjC C++ ObjC++ Joined Separate
820 -include <file> Include the contents of <file> before other files
823 C ObjC C++ ObjC++ Joined Separate
824 -iprefix <path> Specify <path> as a prefix for next two options
827 C ObjC C++ ObjC++ Joined Separate
828 -isysroot <dir> Set <dir> to be the system root directory
831 C ObjC C++ ObjC++ Joined Separate
832 -isystem <dir> Add <dir> to the start of the system include path
835 C ObjC C++ ObjC++ Joined Separate
836 -iquote <dir> Add <dir> to the end of the quote include path
839 C ObjC C++ ObjC++ Joined Separate
840 -iwithprefix <dir> Add <dir> to the end of the system include path
843 C ObjC C++ ObjC++ Joined Separate
844 -iwithprefixbefore <dir> Add <dir> to the end of the main include path
853 C ObjC C++ ObjC++ Undocumented
857 Do not search standard system include directories (those specified with -isystem will still be used)
861 Do not search standard system include directories for C++
864 C ObjC C++ ObjC++ Joined Separate
865 ; Documented in common.opt
869 ; Documented in common.opt
873 ; Documented in common.opt
875 print-objc-runtime-info
877 Generate C header of platform-specific features
881 Print a checksum of the executable for PCH validity checking, and stop
885 Remap file names when including files
889 Conform to the ISO 1998 C++ standard
893 Conform to the ISO 1998 C++ standard, with extensions that are likely to
894 become a part of the upcoming ISO C++ standard, dubbed C++0x. Note that the
895 extensions enabled by this mode are experimental and may be removed in
896 future releases of GCC.
900 Conform to the ISO 1990 C standard
904 Conform to the ISO 1999 C standard
908 Deprecated in favor of -std=c99
912 Conform to the ISO 1998 C++ standard with GNU extensions
916 Conform to the ISO 1998 C++ standard, with GNU extensions and
917 extensions that are likely to become a part of the upcoming ISO C++
918 standard, dubbed C++0x. Note that the extensions enabled by this mode
919 are experimental and may be removed in future releases of GCC.
923 Conform to the ISO 1990 C standard with GNU extensions
927 Conform to the ISO 1999 C standard with GNU extensions
931 Deprecated in favor of -std=gnu99
935 Conform to the ISO 1990 C standard
939 Conform to the ISO 1990 C standard as amended in 1994
943 Conform to the ISO 1999 C standard
947 Deprecated in favor of -std=iso9899:1999
951 Enable traditional preprocessing
955 -trigraphs Support ISO C trigraphs
959 Do not predefine system-specific and GCC-specific macros
963 Enable verbose output
967 ; Documented in common.opt
969 ; This comment is to ensure we retain the blank line above.