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\"
146 Warn about possibly nested block comments, and C++ comments spanning more than one physical line
150 Synonym for -Wcomment
153 C ObjC C++ ObjC++ Var(warn_conversion)
154 Warn about possibly confusing type conversions
157 C++ ObjC++ Var(warn_ctor_dtor_privacy)
158 Warn when all constructors and destructors are private
160 Wdeclaration-after-statement
161 C ObjC Var(warn_declaration_after_statement)
162 Warn when a declaration is found after a statement
165 C++ ObjC++ Var(warn_deprecated) Init(1)
166 Warn about deprecated compiler features
169 C ObjC C++ Var(warn_div_by_zero) Init(1)
170 Warn about compile-time integer division by zero
173 C++ ObjC++ Var(warn_ecpp)
174 Warn about violations of Effective C++ style rules
178 Warn about stray tokens after #elif and #endif
182 ; Documented in common.opt
184 Werror-implicit-function-declaration
185 C ObjC RejectNegative
186 Make implicit function declarations an error
189 C ObjC C++ ObjC++ Var(warn_float_equal)
190 Warn if testing floating point numbers for equality
194 Warn about printf/scanf/strftime/strfmon format string anomalies
197 C ObjC C++ ObjC++ Var(warn_format_extra_args)
198 Warn if passing too many arguments to a function for its format string
201 C ObjC C++ ObjC++ Var(warn_format_nonliteral)
202 Warn about format strings that are not literals
205 C ObjC C++ ObjC++ Var(warn_format_security)
206 Warn about possible security problems with format functions
209 C ObjC C++ ObjC++ Var(warn_format_y2k)
210 Warn about strftime formats yielding 2-digit years
213 C ObjC Var(warn_format_zero_length)
214 Warn about zero-length formats
217 C ObjC C++ ObjC++ Joined
220 C ObjC C++ ObjC++ Var(warn_init_self)
221 Warn about variables which are initialized to themselves
226 Wimplicit-function-declaration
227 C ObjC Var(mesg_implicit_function_declaration) Init(-1)
228 Warn about implicit function declarations
231 C ObjC Var(warn_implicit_int)
232 Warn when a declaration does not specify a type
236 Deprecated. This switch has no effect
239 C ObjC Var(warn_int_to_pointer_cast) Init(1)
240 Warn when there is a cast to a pointer from an integer of a different size
243 C++ ObjC++ Var(warn_invalid_offsetof) Init(1)
244 Warn about invalid uses of the \"offsetof\" macro
248 Warn about PCH files that are found but not used
251 C ObjC C++ ObjC++ Var(warn_long_long) Init(1)
252 Do not warn about using \"long long\" when -pedantic
256 Warn about suspicious declarations of \"main\"
259 C ObjC C++ ObjC++ Var(warn_missing_braces)
260 Warn about possibly missing braces around initializers
262 Wmissing-declarations
263 C ObjC Var(warn_missing_declarations)
264 Warn about global functions without previous declarations
266 Wmissing-field-initializers
267 C ObjC C++ ObjC++ Var(warn_missing_field_initializers) Init(-1)
268 Warn about missing fields in struct initializers
270 Wmissing-format-attribute
271 C ObjC C++ ObjC++ Var(warn_missing_format_attribute)
272 Warn about functions which might be candidates for format attributes
274 Wmissing-include-dirs
276 Warn about user-specified include directories that do not exist
279 C ObjC Var(warn_missing_prototypes)
280 Warn about global functions without prototypes
284 Warn about use of multi-character character constants
287 C ObjC Var(warn_nested_externs)
288 Warn about \"extern\" declarations not at file scope
291 C++ ObjC++ Var(warn_nontemplate_friend) Init(1)
292 Warn when non-templatized friend functions are declared within a template
295 C++ ObjC++ Var(warn_nonvdtor)
296 Warn about non-virtual destructors
299 C ObjC Var(warn_nonnull)
300 Warn about NULL being passed to argument slots marked as requiring non-NULL
303 C ObjC C++ ObjC++ Joined
304 -Wnormalized=<id|nfc|nfkc> Warn about non-normalised Unicode strings
307 C++ ObjC++ Var(warn_old_style_cast)
308 Warn if a C-style cast is used in a program
310 Wold-style-definition
311 C ObjC Var(warn_old_style_definition)
312 Warn if an old-style parameter definition is used
315 C ObjC C++ ObjC++ Var(warn_overlength_strings) Init(-1)
316 Warn if a string is longer than the maximum portable length specified by the standard
319 C++ ObjC++ Var(warn_overloaded_virtual)
320 Warn about overloaded virtual function names
323 C ObjC Var(warn_override_init) Init(-1)
324 Warn about overriding initializers without side effects
327 C ObjC C++ ObjC++ Var(warn_parentheses)
328 Warn about possibly missing parentheses
331 C++ ObjC++ Var(warn_pmf2ptr) Init(1)
332 Warn when converting the type of pointers to member functions
335 C ObjC C++ ObjC++ Var(warn_pointer_arith)
336 Warn about function pointer arithmetic
339 C ObjC Var(warn_pointer_to_int_cast) Init(1)
340 Warn when a pointer is cast to an integer of a different size
343 C ObjC C++ ObjC++ Var(warn_pragmas) Init(1)
344 Warn about misuses of pragmas
347 ObjC ObjC++ Var(warn_protocol) Init(1)
348 Warn if inherited methods are unimplemented
351 C ObjC C++ ObjC++ Var(warn_redundant_decls)
352 Warn about multiple declarations of the same object
355 C++ ObjC++ Var(warn_reorder)
356 Warn when the compiler reorders code
359 C ObjC C++ ObjC++ Var(warn_return_type)
360 Warn whenever a function's return type defaults to \"int\" (C), or about inconsistent return types (C++)
363 ObjC ObjC++ Var(warn_selector)
364 Warn if a selector has multiple methods
367 C ObjC C++ ObjC++ Var(warn_sequence_point)
368 Warn about possible violations of sequence point rules
371 C ObjC C++ ObjC++ Var(warn_sign_compare) Init(-1)
372 Warn about signed-unsigned comparisons
375 C++ ObjC++ Var(warn_sign_promo)
376 Warn when overload promotes from unsigned to signed
378 Wstrict-null-sentinel
380 Warn about uncasted NULL used as sentinel
383 C ObjC Var(warn_strict_prototypes)
384 Warn about unprototyped function declarations
386 Wstrict-selector-match
387 ObjC ObjC++ Var(warn_strict_selector_match)
388 Warn if type signatures of candidate methods do not match exactly
391 C++ ObjC++ Var(warn_synth)
392 Warn when synthesis behavior differs from Cfront
396 Do not suppress warnings from system headers
399 C ObjC Var(warn_traditional)
400 Warn about features not present in traditional C
404 Warn if trigraphs are encountered that might affect the meaning of the program
407 ObjC ObjC++ Var(warn_undeclared_selector)
408 Warn about @selector()s without previously declared methods
412 Warn if an undefined macro is used in an #if directive
416 Warn about unrecognized pragmas
420 Warn about macros defined in the main file that are not used
424 Do not warn about using variadic macros when -pedantic
427 C ObjC C++ ObjC++ Var(warn_write_strings)
428 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.
431 C ObjC Var(warn_pointer_sign) Init(-1)
432 Warn when a pointer differs in signedness in an assignment
436 A synonym for -std=c89 (for C) or -std=c++98 (for C++)
439 C ObjC C++ ObjC++ Joined
440 ; Documented in common.opt. FIXME - what about -dI, -dD, -dN and -dD?
444 Enforce class member access control semantics
449 falt-external-templates
451 Change when template instances are emitted
455 Recognize the \"asm\" keyword
459 Recognize built-in functions
462 C ObjC C++ ObjC++ Joined
466 Check the return value of new
470 Allow the arguments of the '?' operator to have different types
474 Reduce the size of object files
476 fconstant-string-class=
478 -fconst-string-class=<name> Use class <name> for constant strings
482 Inline member functions by default
484 fdollars-in-identifiers
486 Permit '$' as an identifier character
493 Generate code to check exception specifications
499 C ObjC C++ ObjC++ Joined RejectNegative
500 -fexec-charset=<cset> Convert all strings and character constants to character set <cset>
502 fextended-identifiers
504 Permit universal character names (\\u and \\U) in identifiers
507 C ObjC C++ ObjC++ Joined RejectNegative
508 -finput-charset=<cset> Specify the default character set for source files
517 ffixed-line-length-none
525 Scope of for-init-statement variables is local to the loop
529 Do not assume that standard C libraries and \"main\" exist
533 Recognize GNU-defined keywords
537 Generate code for GNU runtime environment
550 Assume normal C execution environment
554 Enable support for huge objects
558 Export functions even if they can be inlined
560 fimplicit-inline-templates
562 Emit implicit instantiations of inline templates
566 Emit implicit instantiations of templates
569 C++ Var(flag_friend_injection)
570 Inject friend functions into enclosing namespace
577 Don't warn about uses of Microsoft extensions
579 fname-mangling-version-
587 Generate code for NeXT (Apple Mac OS X) runtime environment
591 Assume that receivers of Objective-C messages may be nil
599 ; Generate special '- .cxx_construct' and '- .cxx_destruct' methods
600 ; to initialize any non-POD ivars in Objective-C++ classes.
601 fobjc-call-cxx-cdtors
602 ObjC++ Var(flag_objc_call_cxx_cdtors)
603 Generate special Objective-C methods to initialize/destroy non-POD C++ ivars, if needed
605 fobjc-direct-dispatch
606 ObjC ObjC++ Var(flag_objc_direct_dispatch)
607 Allow fast jumps to the message dispatcher
609 ; Nonzero means that we will allow new ObjC exception syntax (@throw,
610 ; @try, etc.) in source code.
612 ObjC ObjC++ Var(flag_objc_exceptions)
613 Enable Objective-C exception and synchronization syntax
616 ObjC ObjC++ Var(flag_objc_gc)
617 Enable garbage collection (GC) in Objective-C/Objective-C++ programs
619 ; Nonzero means that we generate NeXT setjmp based exceptions.
620 fobjc-sjlj-exceptions
621 ObjC ObjC++ Var(flag_objc_sjlj_exceptions) Init(-1)
622 Enable Objective-C setjmp exception handling runtime
625 C ObjC C++ ObjC++ Var(flag_openmp)
630 Recognize C++ kewords like \"compl\" and \"xor\"
634 Enable optional diagnostics
641 Look for and use PCH files even when preprocessing
645 Downgrade conformance errors to warnings
649 Treat the input file as already preprocessed
651 freplace-objc-classes
653 Used in Fix-and-Continue mode to indicate that object files may be swapped in at runtime
657 Enable automatic template instantiation
661 Generate run time type descriptor information
665 Use the same size for double as for float
669 Use the narrowest integer type possible for enumeration types
673 Force the underlying type for \"wchar_t\" to be \"unsigned short\"
677 When \"signed\" or \"unsigned\" is not given make the bitfield signed
681 Make \"char\" signed by default
688 Display statistics accumulated during compilation
694 C ObjC C++ ObjC++ Joined RejectNegative UInteger
695 -ftabstop=<number> Distance between tab stops for column reporting
698 C++ ObjC++ Joined RejectNegative UInteger
699 -ftemplate-depth-<number> Specify maximum template instantiation depth
706 -fno-threadsafe-statics Do not generate thread-safe code for initializing local statics
710 When \"signed\" or \"unsigned\" is not given make the bitfield unsigned
714 Make \"char\" unsigned by default
718 Use __cxa_atexit to register destructors
720 fuse-cxa-get-exception-ptr
722 Use __cxa_get_exception_ptr in exception handling
724 fvisibility-inlines-hidden
726 Marks all inlined methods as having hidden visibility
730 Discard unused virtual functions
734 Implement vtables using thunks
738 Emit common-like symbols as weak symbols
741 C ObjC C++ ObjC++ Joined RejectNegative
742 -fwide-exec-charset=<cset> Convert all wide strings and character constants to character set <cset>
746 Generate a #line directive pointing at the current working directory
750 Emit cross referencing information
754 Generate lazy class lookup (via objc_getClass()) for use in Zero-Link mode
758 Dump declarations to a .decl file
761 C ObjC C++ ObjC++ Joined Separate
762 -idirafter <dir> Add <dir> to the end of the system include path
765 C ObjC C++ ObjC++ Joined Separate
766 -imacros <file> Accept definition of macros in <file>
769 C ObjC C++ ObjC++ Joined Separate
770 -imultilib <dir> Set <dir> to be the multilib include subdirectory
773 C ObjC C++ ObjC++ Joined Separate
774 -include <file> Include the contents of <file> before other files
777 C ObjC C++ ObjC++ Joined Separate
778 -iprefix <path> Specify <path> as a prefix for next two options
781 C ObjC C++ ObjC++ Joined Separate
782 -isysroot <dir> Set <dir> to be the system root directory
785 C ObjC C++ ObjC++ Joined Separate
786 -isystem <dir> Add <dir> to the start of the system include path
789 C ObjC C++ ObjC++ Joined Separate
790 -iquote <dir> Add <dir> to the end of the quote include path
793 C ObjC C++ ObjC++ Joined Separate
794 -iwithprefix <dir> Add <dir> to the end of the system include path
797 C ObjC C++ ObjC++ Joined Separate
798 -iwithprefixbefore <dir> Add <dir> to the end of the main include path
807 C ObjC C++ ObjC++ Undocumented
811 Do not search standard system include directories (those specified with -isystem will still be used)
815 Do not search standard system include directories for C++
818 C ObjC C++ ObjC++ Joined Separate
819 ; Documented in common.opt
823 ; Documented in common.opt
827 ; Documented in common.opt
829 print-objc-runtime-info
831 Generate C header of platform-specific features
835 Print a checksum of the executable for PCH validity checking, and stop
839 Remap file names when including files
843 Conform to the ISO 1998 C++ standard
847 Conform to the ISO 1990 C standard
851 Conform to the ISO 1999 C standard
855 Deprecated in favor of -std=c99
859 Conform to the ISO 1998 C++ standard with GNU extensions
863 Conform to the ISO 1990 C standard with GNU extensions
867 Conform to the ISO 1999 C standard with GNU extensions
871 Deprecated in favor of -std=gnu99
875 Conform to the ISO 1990 C standard
879 Conform to the ISO 1990 C standard as amended in 1994
883 Conform to the ISO 1999 C standard
887 Deprecated in favor of -std=iso9899:1999
891 Enable traditional preprocessing
895 -trigraphs Support ISO C trigraphs
899 Do not predefine system-specific and GCC-specific macros
903 Enable verbose output
907 ; Documented in common.opt
909 ; This comment is to ensure we retain the blank line above.