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.
24 ; Please try to keep this file in ASCII collating order.
39 C ObjC C++ ObjC++ Joined Separate
42 C ObjC C++ ObjC++ Joined Separate
43 -A<question>=<answer> Assert the <answer> to <question>. Putting '-' before <question> disables the <answer> to <question>
47 Do not discard comments
51 Do not discard comments in macro expansions
54 C ObjC C++ ObjC++ Joined Separate
55 -D<macro>[=<val>] Define a <macro> with <val> as its value. If just <macro> is given, <val> is taken to be 1
58 C ObjC C++ ObjC++ Undocumented
61 C ObjC C++ ObjC++ Joined Separate
62 -F <dir> Add <dir> to the end of the main framework include path
66 Print the name of header files as they are used
69 C ObjC C++ ObjC++ Joined Separate
70 -I <dir> Add <dir> to the end of the main include path
74 Generate make dependencies
77 C ObjC C++ ObjC++ Separate
78 Generate make dependencies and compile
81 C ObjC C++ ObjC++ Joined Separate
82 -MF <file> Write dependency output to the given file
86 Treat missing header files as generated files
90 Like -M but ignore system header files
93 C ObjC C++ ObjC++ Separate
94 Like -MD but ignore system header files
98 Generate phony targets for all headers
101 C ObjC C++ ObjC++ Joined Separate
102 -MQ <target> Add a MAKE-quoted target
105 C ObjC C++ ObjC++ Joined Separate
106 -MT <target> Add an unquoted target
110 Do not generate #line directives
113 C ObjC C++ ObjC++ Joined Separate
114 -U<macro> Undefine <macro>
117 C++ ObjC++ Var(warn_abi)
118 Warn about things that will change when compiling with an ABI-compliant compiler
121 C ObjC C++ ObjC++ Var(warn_address)
122 Warn about suspicious uses of memory addresses
126 Enable most warning messages
129 ObjC ObjC++ Var(warn_assign_intercept)
130 Warn whenever an Objective-C assignment is being intercepted by the garbage collector
133 C ObjC Var(warn_bad_function_cast)
134 Warn about casting functions to incompatible types
137 C ObjC Var(warn_cxx_compat)
138 Warn about C constructs that are not in the common subset of C and C++
142 C ObjC C++ ObjC++ Var(warn_cast_qual)
143 Warn about casts which discard qualifiers
146 C ObjC C++ ObjC++ Var(warn_char_subscripts)
147 Warn about subscripts whose type is \"char\"
151 Warn about possibly nested block comments, and C++ comments spanning more than one physical line
155 Synonym for -Wcomment
158 C ObjC C++ ObjC++ Var(warn_conversion)
159 Warn about possibly confusing type conversions
162 C++ ObjC++ Var(warn_ctor_dtor_privacy)
163 Warn when all constructors and destructors are private
165 Wdeclaration-after-statement
166 C ObjC Var(warn_declaration_after_statement)
167 Warn when a declaration is found after a statement
170 C++ ObjC++ Var(warn_deprecated) Init(1)
171 Warn about deprecated compiler features
174 C ObjC C++ ObjC++ Var(warn_div_by_zero) Init(1)
175 Warn about compile-time integer division by zero
178 C++ ObjC++ Var(warn_ecpp)
179 Warn about violations of Effective C++ style rules
183 Warn about stray tokens after #elif and #endif
187 ; Documented in common.opt
189 Werror-implicit-function-declaration
190 C ObjC RejectNegative
191 Make implicit function declarations an error
194 C ObjC C++ ObjC++ Var(warn_float_equal)
195 Warn if testing floating point numbers for equality
199 Warn about printf/scanf/strftime/strfmon format string anomalies
202 C ObjC C++ ObjC++ Var(warn_format_extra_args)
203 Warn if passing too many arguments to a function for its format string
206 C ObjC C++ ObjC++ Var(warn_format_nonliteral)
207 Warn about format strings that are not literals
210 C ObjC C++ ObjC++ Var(warn_format_security)
211 Warn about possible security problems with format functions
214 C ObjC C++ ObjC++ Var(warn_format_y2k)
215 Warn about strftime formats yielding 2-digit years
218 C ObjC Var(warn_format_zero_length)
219 Warn about zero-length formats
222 C ObjC C++ ObjC++ Joined
225 C ObjC C++ ObjC++ Var(warn_init_self)
226 Warn about variables which are initialized to themselves
231 Wimplicit-function-declaration
232 C ObjC Var(mesg_implicit_function_declaration) Init(-1)
233 Warn about implicit function declarations
236 C ObjC Var(warn_implicit_int)
237 Warn when a declaration does not specify a type
241 Deprecated. This switch has no effect
244 C ObjC Var(warn_int_to_pointer_cast) Init(1)
245 Warn when there is a cast to a pointer from an integer of a different size
248 C++ ObjC++ Var(warn_invalid_offsetof) Init(1)
249 Warn about invalid uses of the \"offsetof\" macro
253 Warn about PCH files that are found but not used
256 C ObjC C++ ObjC++ Var(warn_long_long) Init(1)
257 Do not warn about using \"long long\" when -pedantic
261 Warn about suspicious declarations of \"main\"
264 C ObjC C++ ObjC++ Var(warn_missing_braces)
265 Warn about possibly missing braces around initializers
267 Wmissing-declarations
268 C ObjC Var(warn_missing_declarations)
269 Warn about global functions without previous declarations
271 Wmissing-field-initializers
272 C ObjC C++ ObjC++ Var(warn_missing_field_initializers) Init(-1)
273 Warn about missing fields in struct initializers
275 Wmissing-format-attribute
276 C ObjC C++ ObjC++ Var(warn_missing_format_attribute)
277 Warn about functions which might be candidates for format attributes
279 Wmissing-include-dirs
281 Warn about user-specified include directories that do not exist
284 C ObjC Var(warn_missing_prototypes)
285 Warn about global functions without prototypes
289 Warn about use of multi-character character constants
292 C ObjC Var(warn_nested_externs)
293 Warn about \"extern\" declarations not at file scope
295 ; APPLE LOCAL begin -Wnewline-eof
298 Warn about files missing a newline at the end of the file
299 ; APPLE LOCAL end -Wnewline-eof
302 C++ ObjC++ Var(warn_nontemplate_friend) Init(1)
303 Warn when non-templatized friend functions are declared within a template
306 C++ ObjC++ Var(warn_nonvdtor)
307 Warn about non-virtual destructors
310 C ObjC Var(warn_nonnull)
311 Warn about NULL being passed to argument slots marked as requiring non-NULL
314 C ObjC C++ ObjC++ Joined
315 -Wnormalized=<id|nfc|nfkc> Warn about non-normalised Unicode strings
318 C++ ObjC++ Var(warn_old_style_cast)
319 Warn if a C-style cast is used in a program
321 Wold-style-definition
322 C ObjC Var(warn_old_style_definition)
323 Warn if an old-style parameter definition is used
326 C ObjC C++ ObjC++ Var(warn_overlength_strings) Init(-1)
327 Warn if a string is longer than the maximum portable length specified by the standard
330 C++ ObjC++ Var(warn_overloaded_virtual)
331 Warn about overloaded virtual function names
334 C ObjC Var(warn_override_init) Init(-1)
335 Warn about overriding initializers without side effects
338 C ObjC C++ ObjC++ Var(warn_parentheses)
339 Warn about possibly missing parentheses
342 C++ ObjC++ Var(warn_pmf2ptr) Init(1)
343 Warn when converting the type of pointers to member functions
346 C ObjC C++ ObjC++ Var(warn_pointer_arith)
347 Warn about function pointer arithmetic
350 C ObjC Var(warn_pointer_to_int_cast) Init(1)
351 Warn when a pointer is cast to an integer of a different size
354 C ObjC C++ ObjC++ Var(warn_pragmas) Init(1)
355 Warn about misuses of pragmas
358 ObjC ObjC++ Var(warn_protocol) Init(1)
359 Warn if inherited methods are unimplemented
362 C ObjC C++ ObjC++ Var(warn_redundant_decls)
363 Warn about multiple declarations of the same object
366 C++ ObjC++ Var(warn_reorder)
367 Warn when the compiler reorders code
370 C ObjC C++ ObjC++ Var(warn_return_type)
371 Warn whenever a function's return type defaults to \"int\" (C), or about inconsistent return types (C++)
374 ObjC ObjC++ Var(warn_selector)
375 Warn if a selector has multiple methods
378 C ObjC C++ ObjC++ Var(warn_sequence_point)
379 Warn about possible violations of sequence point rules
382 C ObjC C++ ObjC++ Var(warn_sign_compare) Init(-1)
383 Warn about signed-unsigned comparisons
386 C++ ObjC++ Var(warn_sign_promo)
387 Warn when overload promotes from unsigned to signed
389 Wstrict-null-sentinel
391 Warn about uncasted NULL used as sentinel
394 C ObjC Var(warn_strict_prototypes)
395 Warn about unprototyped function declarations
397 Wstrict-selector-match
398 ObjC ObjC++ Var(warn_strict_selector_match)
399 Warn if type signatures of candidate methods do not match exactly
402 C++ ObjC++ Var(warn_synth)
403 Warn when synthesis behavior differs from Cfront
407 Do not suppress warnings from system headers
410 C ObjC Var(warn_traditional)
411 Warn about features not present in traditional C
414 Common Var(warn_trampolines)
415 Warn when trampolines are emitted
419 Warn if trigraphs are encountered that might affect the meaning of the program
422 ObjC ObjC++ Var(warn_undeclared_selector)
423 Warn about @selector()s without previously declared methods
427 Warn if an undefined macro is used in an #if directive
431 Warn about unrecognized pragmas
435 Warn about macros defined in the main file that are not used
439 Do not warn about using variadic macros when -pedantic
442 C ObjC C++ ObjC++ Var(warn_vla) Init(-1) Warning
443 Warn if a variable length array is used
446 C ObjC C++ ObjC++ Var(warn_write_strings)
447 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.
450 C ObjC Var(warn_pointer_sign) Init(-1)
451 Warn when a pointer differs in signedness in an assignment
455 A synonym for -std=c89 (for C) or -std=c++98 (for C++)
458 C ObjC C++ ObjC++ Joined
459 ; Documented in common.opt. FIXME - what about -dI, -dD, -dN and -dD?
463 Enforce class member access control semantics
468 falt-external-templates
470 Change when template instances are emitted
474 Recognize the \"asm\" keyword
478 Recognize built-in functions
481 C ObjC C++ ObjC++ Joined
485 Check the return value of new
489 Allow the arguments of the '?' operator to have different types
493 Reduce the size of object files
495 fconstant-string-class=
497 -fconst-string-class=<name> Use class <name> for constant strings
501 Inline member functions by default
505 Preprocess directives only.
507 fdollars-in-identifiers
509 Permit '$' as an identifier character
516 Generate code to check exception specifications
522 C ObjC C++ ObjC++ Joined RejectNegative
523 -fexec-charset=<cset> Convert all strings and character constants to character set <cset>
525 fextended-identifiers
527 Permit universal character names (\\u and \\U) in identifiers
530 C ObjC C++ ObjC++ Joined RejectNegative
531 -finput-charset=<cset> Specify the default character set for source files
539 Scope of for-init-statement variables is local to the loop
543 Do not assume that standard C libraries and \"main\" exist
547 Recognize GNU-defined keywords
551 Generate code for GNU runtime environment
554 C ObjC Var(flag_gnu89_inline) Init(-1)
555 Use traditional GNU semantics for inline functions
568 Assume normal C execution environment
572 Enable support for huge objects
576 Export functions even if they can be inlined
578 fimplicit-inline-templates
580 Emit implicit instantiations of inline templates
584 Emit implicit instantiations of templates
587 C++ ObjC++ Var(flag_friend_injection)
588 Inject friend functions into enclosing namespace
593 flax-vector-conversions
595 Allow implicit conversions between vectors with differing numbers of subparts and/or differing element types.
599 Don't warn about uses of Microsoft extensions
601 fname-mangling-version-
609 Generate code for NeXT (Apple Mac OS X) runtime environment
613 Assume that receivers of Objective-C messages may be nil
621 ; Generate special '- .cxx_construct' and '- .cxx_destruct' methods
622 ; to initialize any non-POD ivars in Objective-C++ classes.
623 fobjc-call-cxx-cdtors
624 ObjC++ Var(flag_objc_call_cxx_cdtors)
625 Generate special Objective-C methods to initialize/destroy non-POD C++ ivars, if needed
627 fobjc-direct-dispatch
628 ObjC ObjC++ Var(flag_objc_direct_dispatch)
629 Allow fast jumps to the message dispatcher
631 ; Nonzero means that we will allow new ObjC exception syntax (@throw,
632 ; @try, etc.) in source code.
634 ObjC ObjC++ Var(flag_objc_exceptions)
635 Enable Objective-C exception and synchronization syntax
638 ObjC ObjC++ Var(flag_objc_gc)
639 Enable garbage collection (GC) in Objective-C/Objective-C++ programs
641 ; Nonzero means that we generate NeXT setjmp based exceptions.
642 fobjc-sjlj-exceptions
643 ObjC ObjC++ Var(flag_objc_sjlj_exceptions) Init(-1)
644 Enable Objective-C setjmp exception handling runtime
647 C ObjC C++ ObjC++ Var(flag_openmp)
652 Recognize C++ kewords like \"compl\" and \"xor\"
656 Enable optional diagnostics
663 Look for and use PCH files even when preprocessing
667 Downgrade conformance errors to warnings
671 Treat the input file as already preprocessed
673 freplace-objc-classes
675 Used in Fix-and-Continue mode to indicate that object files may be swapped in at runtime
679 Enable automatic template instantiation
683 Generate run time type descriptor information
687 Use the same size for double as for float
691 Use the narrowest integer type possible for enumeration types
695 Force the underlying type for \"wchar_t\" to be \"unsigned short\"
699 When \"signed\" or \"unsigned\" is not given make the bitfield signed
703 Make \"char\" signed by default
710 Display statistics accumulated during compilation
716 C ObjC C++ ObjC++ Joined RejectNegative UInteger
717 -ftabstop=<number> Distance between tab stops for column reporting
720 C++ ObjC++ Joined RejectNegative UInteger
721 -ftemplate-depth-<number> Specify maximum template instantiation depth
728 -fno-threadsafe-statics Do not generate thread-safe code for initializing local statics
732 When \"signed\" or \"unsigned\" is not given make the bitfield unsigned
736 Make \"char\" unsigned by default
740 Use __cxa_atexit to register destructors
742 fuse-cxa-get-exception-ptr
744 Use __cxa_get_exception_ptr in exception handling
746 fvisibility-inlines-hidden
748 Marks all inlined methods as having hidden visibility
750 fvisibility-ms-compat
751 C++ ObjC++ Var(flag_visibility_ms_compat)
752 Changes visibility to match Microsoft Visual Studio by default
756 Discard unused virtual functions
760 Implement vtables using thunks
764 Emit common-like symbols as weak symbols
767 C ObjC C++ ObjC++ Joined RejectNegative
768 -fwide-exec-charset=<cset> Convert all wide strings and character constants to character set <cset>
772 Generate a #line directive pointing at the current working directory
776 Emit cross referencing information
780 Generate lazy class lookup (via objc_getClass()) for use in Zero-Link mode
784 Dump declarations to a .decl file
786 femit-struct-debug-baseonly
788 -femit-struct-debug-baseonly Aggressive reduced debug info for structs
790 femit-struct-debug-reduced
792 -femit-struct-debug-reduced Conservative reduced debug info for structs
794 femit-struct-debug-detailed=
795 C ObjC C++ ObjC++ Joined
796 -femit-struct-debug-detailed=<spec-list> Detailed reduced debug info for structs
799 C ObjC C++ ObjC++ Joined Separate
800 -idirafter <dir> Add <dir> to the end of the system include path
803 C ObjC C++ ObjC++ Joined Separate
804 -imacros <file> Accept definition of macros in <file>
807 C ObjC C++ ObjC++ Joined Separate
808 -imultilib <dir> Set <dir> to be the multilib include subdirectory
811 C ObjC C++ ObjC++ Joined Separate
812 -include <file> Include the contents of <file> before other files
815 C ObjC C++ ObjC++ Joined Separate
816 -iprefix <path> Specify <path> as a prefix for next two options
819 C ObjC C++ ObjC++ Joined Separate
820 -isysroot <dir> Set <dir> to be the system root directory
823 C ObjC C++ ObjC++ Joined Separate
824 -isystem <dir> Add <dir> to the start of the system include path
827 C ObjC C++ ObjC++ Joined Separate
828 -iquote <dir> Add <dir> to the end of the quote include path
831 C ObjC C++ ObjC++ Joined Separate
832 -iwithprefix <dir> Add <dir> to the end of the system include path
835 C ObjC C++ ObjC++ Joined Separate
836 -iwithprefixbefore <dir> Add <dir> to the end of the main include path
845 C ObjC C++ ObjC++ Undocumented
849 Do not search standard system include directories (those specified with -isystem will still be used)
853 Do not search standard system include directories for C++
856 C ObjC C++ ObjC++ Joined Separate
857 ; Documented in common.opt
861 ; Documented in common.opt
865 ; Documented in common.opt
867 print-objc-runtime-info
869 Generate C header of platform-specific features
873 Print a checksum of the executable for PCH validity checking, and stop
877 Remap file names when including files
881 Conform to the ISO 1998 C++ standard
885 Conform to the ISO 1990 C standard
889 Conform to the ISO 1999 C standard
893 Deprecated in favor of -std=c99
897 Conform to the ISO 1998 C++ standard with GNU extensions
901 Conform to the ISO 1990 C standard with GNU extensions
905 Conform to the ISO 1999 C standard with GNU extensions
909 Deprecated in favor of -std=gnu99
913 Conform to the ISO 1990 C standard
917 Conform to the ISO 1990 C standard as amended in 1994
921 Conform to the ISO 1999 C standard
925 Deprecated in favor of -std=iso9899:1999
929 Enable traditional preprocessing
933 -trigraphs Support ISO C trigraphs
937 Do not predefine system-specific and GCC-specific macros
941 Enable verbose output
945 ; Documented in common.opt
947 ; This comment is to ensure we retain the blank line above.