1 ; Options for the C, ObjC, C++ and ObjC++ front ends.
2 ; Copyright (C) 2003, 2004, 2005 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, 59 Temple Place - Suite 330, 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 C ObjC Var(warn_bad_function_cast)
125 Warn about casting functions to incompatible types
128 C ObjC C++ ObjC++ Var(warn_cast_qual)
129 Warn about casts which discard qualifiers
132 C ObjC C++ ObjC++ Var(warn_char_subscripts)
133 Warn about subscripts whose type is \"char\"
137 Warn about possibly nested block comments, and C++ comments spanning more than one physical line
141 Synonym for -Wcomment
144 C ObjC C++ ObjC++ Var(warn_conversion)
145 Warn about possibly confusing type conversions
148 C++ ObjC++ Var(warn_ctor_dtor_privacy)
149 Warn when all constructors and destructors are private
151 Wdeclaration-after-statement
152 C ObjC Var(warn_declaration_after_statement)
153 Warn when a declaration is found after a statement
156 C++ ObjC++ Var(warn_deprecated) Init(1)
157 Warn about deprecated compiler features
160 C ObjC Var(warn_div_by_zero) Init(1)
161 Warn about compile-time integer division by zero
164 C++ ObjC++ Var(warn_ecpp)
165 Warn about violations of Effective C++ style rules
169 Warn about stray tokens after #elif and #endif
173 ; Documented in common.opt
175 Werror-implicit-function-declaration
176 C ObjC RejectNegative
177 Make implicit function declarations an error
180 C ObjC C++ ObjC++ Var(warn_float_equal)
181 Warn if testing floating point numbers for equality
185 Warn about printf/scanf/strftime/strfmon format string anomalies
188 C ObjC C++ ObjC++ Var(warn_format_extra_args)
189 Warn if passing too many arguments to a function for its format string
192 C ObjC C++ ObjC++ Var(warn_format_nonliteral)
193 Warn about format strings that are not literals
196 C ObjC C++ ObjC++ Var(warn_format_security)
197 Warn about possible security problems with format functions
200 C ObjC C++ ObjC++ Var(warn_format_y2k)
201 Warn about strftime formats yielding 2-digit years
204 C ObjC Var(warn_format_zero_length)
205 Warn about zero-length formats
208 C ObjC C++ ObjC++ Joined
211 C ObjC C++ ObjC++ Var(warn_init_self)
212 Warn about variables which are initialized to themselves.
217 Wimplicit-function-declaration
218 C ObjC Var(mesg_implicit_function_declaration) Init(-1)
219 Warn about implicit function declarations
222 C ObjC Var(warn_implicit_int)
223 Warn when a declaration does not specify a type
227 Deprecated. This switch has no effect.
230 C ObjC Var(warn_int_to_pointer_cast) Init(1)
231 Warn when there is a cast to a pointer from an integer of a different size
234 C++ ObjC++ Var(warn_invalid_offsetof) Init(1)
235 Warn about invalid uses of the \"offsetof\" macro
239 Warn about PCH files that are found but not used
242 C ObjC C++ ObjC++ Var(warn_long_long) Init(1)
243 Do not warn about using \"long long\" when -pedantic
247 Warn about suspicious declarations of \"main\"
250 C ObjC C++ ObjC++ Var(warn_missing_braces)
251 Warn about possibly missing braces around initializers
253 Wmissing-declarations
254 C ObjC Var(warn_missing_declarations)
255 Warn about global functions without previous declarations
257 Wmissing-field-initializers
258 C ObjC C++ ObjC++ Var(warn_missing_field_initializers) Init(-1)
259 Warn about missing fields in struct initializers
261 Wmissing-format-attribute
262 C ObjC C++ ObjC++ Var(warn_missing_format_attribute)
263 Warn about functions which might be candidates for format attributes
265 Wmissing-include-dirs
267 Warn about user-specified include directories that do not exist
270 C ObjC Var(warn_missing_prototypes)
271 Warn about global functions without prototypes
275 Warn about use of multi-character character constants
278 C ObjC Var(warn_nested_externs)
279 Warn about \"extern\" declarations not at file scope
282 C++ ObjC++ Var(warn_nontemplate_friend) Init(1)
283 Warn when non-templatized friend functions are declared within a template
286 C++ ObjC++ Var(warn_nonvdtor)
287 Warn about non-virtual destructors
290 C ObjC Var(warn_nonnull)
291 Warn about NULL being passed to argument slots marked as requiring non-NULL
294 C ObjC C++ ObjC++ Joined
295 -Wnormalized=<id|nfc|nfkc> Warn about non-normalised Unicode strings
298 C++ ObjC++ Var(warn_old_style_cast)
299 Warn if a C-style cast is used in a program
301 Wold-style-definition
302 C ObjC Var(warn_old_style_definition)
303 Warn if an old-style parameter definition is used
306 C++ ObjC++ Var(warn_overloaded_virtual)
307 Warn about overloaded virtual function names
310 C ObjC C++ ObjC++ Var(warn_parentheses)
311 Warn about possibly missing parentheses
314 C++ ObjC++ Var(warn_pmf2ptr) Init(1)
315 Warn when converting the type of pointers to member functions
318 C ObjC C++ ObjC++ Var(warn_pointer_arith)
319 Warn about function pointer arithmetic
322 C ObjC Var(warn_pointer_to_int_cast) Init(1)
323 Warn when a pointer is cast to an integer of a different size
326 ObjC ObjC++ Var(warn_protocol) Init(1)
327 Warn if inherited methods are unimplemented
330 C ObjC C++ ObjC++ Var(warn_redundant_decls)
331 Warn about multiple declarations of the same object
334 C++ ObjC++ Var(warn_reorder)
335 Warn when the compiler reorders code
339 Warn whenever a function's return type defaults to \"int\" (C), or about inconsistent return types (C++)
342 ObjC ObjC++ Var(warn_selector)
343 Warn if a selector has multiple methods
346 C ObjC C++ ObjC++ Var(warn_sequence_point)
347 Warn about possible violations of sequence point rules
350 C ObjC C++ ObjC++ Var(warn_sign_compare) Init(-1)
351 Warn about signed-unsigned comparisons
354 C++ ObjC++ Var(warn_sign_promo)
355 Warn when overload promotes from unsigned to signed
357 Wstrict-null-sentinel
359 Warn about uncasted NULL used as sentinel
362 C ObjC Var(warn_strict_prototypes)
363 Warn about unprototyped function declarations
366 C++ ObjC++ Var(warn_synth)
367 Warn when synthesis behavior differs from Cfront
371 Do not suppress warnings from system headers
374 C ObjC Var(warn_traditional)
375 Warn about features not present in traditional C
379 Warn if trigraphs are encountered that might affect the meaning of the program
382 ObjC ObjC++ Var(warn_undeclared_selector)
383 Warn about @selector()s without previously declared methods
387 Warn if an undefined macro is used in an #if directive
391 Warn about unrecognized pragmas
395 Warn about macros defined in the main file that are not used
399 Do not warn about using variadic macros when -pedantic
403 Give strings the type \"array of char\"
406 C ObjC Var(warn_pointer_sign) Init(1)
407 Warn when a pointer differs in signedness in an assignment.
411 A synonym for -std=c89 (for C) or -std=c++98 (for C++).
414 C ObjC C++ ObjC++ Joined
415 ; Documented in common.opt. FIXME - what about -dI, -dD, -dN and -dD?
419 Enforce class member access control semantics
424 falt-external-templates
426 Change when template instances are emitted
430 Recognize the \"asm\" keyword
434 Recognize built-in functions
437 C ObjC C++ ObjC++ Joined
441 Check the return value of new
445 Allow the arguments of the '?' operator to have different types
449 Reduce the size of object files
453 Make string literals \"const char[]\" not \"char[]\"
455 fconstant-string-class=
457 -fconst-string-class=<name> Use class <name> for constant strings
461 Inline member functions by default
463 fdollars-in-identifiers
465 Permit '$' as an identifier character
472 Generate code to check exception specifications
478 C ObjC C++ ObjC++ Joined RejectNegative
479 -fexec-charset=<cset> Convert all strings and character constants to character set <cset>
482 C ObjC C++ ObjC++ Joined RejectNegative
483 -finput-charset=<cset> Specify the default character set for source files.
497 Scope of for-init-statement variables is local to the loop
501 Do not assume that standard C libraries and \"main\" exist
505 Recognize GNU-defined keywords
509 Generate code for GNU runtime environment
522 Assume normal C execution environment
526 Enable support for huge objects
530 Export functions even if they can be inlined
532 fimplicit-inline-templates
534 Emit implicit instantiations of inline templates
538 Emit implicit instantiations of templates
545 Don't warn about uses of Microsoft extensions
547 fname-mangling-version-
555 Generate code for NeXT (Apple Mac OS X) runtime environment
559 Assume that receivers of Objective-C messages may be nil
569 Enable Objective-C exception and synchronization syntax
571 fobjc-sjlj-exceptions
573 Enable Objective-C setjmp exception handling runtime
577 Recognize C++ kewords like \"compl\" and \"xor\"
581 Enable optional diagnostics
588 Look for and use PCH files even when preprocessing
592 Downgrade conformance errors to warnings
596 Treat the input file as already preprocessed
598 freplace-objc-classes
600 Used in Fix-and-Continue mode to indicate that object files may be swapped in at runtime
604 Enable automatic template instantiation
608 Generate run time type descriptor information
612 Use the same size for double as for float
616 Use the narrowest integer type possible for enumeration types
620 Force the underlying type for \"wchar_t\" to be \"unsigned short\"
624 When \"signed\" or \"unsigned\" is not given make the bitfield signed
628 Make \"char\" signed by default
635 Display statistics accumulated during compilation
641 C ObjC C++ ObjC++ Joined RejectNegative UInteger
642 -ftabstop=<number> Distance between tab stops for column reporting
645 C++ ObjC++ Joined RejectNegative UInteger
646 -ftemplate-depth-<number> Specify maximum template instantiation depth
653 -fno-threadsafe-statics Do not generate thread-safe code for initializing local statics.
657 When \"signed\" or \"unsigned\" is not given make the bitfield unsigned
661 Make \"char\" unsigned by default
665 Use __cxa_atexit to register destructors
667 fvisibility-inlines-hidden
669 Marks all inlined methods as having hidden visibility
673 Discard unused virtual functions
677 Implement vtables using thunks
681 Emit common-like symbols as weak symbols
684 C ObjC C++ ObjC++ Joined RejectNegative
685 -fwide-exec-charset=<cset> Convert all wide strings and character constants to character set <cset>
689 Generate a #line directive pointing at the current working directory
693 Emit cross referencing information
697 Generate lazy class lookup (via objc_getClass()) for use in Zero-Link mode
701 Dump declarations to a .decl file
704 C ObjC C++ ObjC++ Joined Separate
705 -idirafter <dir> Add <dir> to the end of the system include path
708 C ObjC C++ ObjC++ Joined Separate
709 -imacros <file> Accept definition of macros in <file>
712 C ObjC C++ ObjC++ Joined Separate
713 -include <file> Include the contents of <file> before other files
716 C ObjC C++ ObjC++ Joined Separate
717 -iprefix <path> Specify <path> as a prefix for next two options
720 C ObjC C++ ObjC++ Joined Separate
721 -isysroot <dir> Set <dir> to be the system root directory
724 C ObjC C++ ObjC++ Joined Separate
725 -isystem <dir> Add <dir> to the start of the system include path
728 C ObjC C++ ObjC++ Joined Separate
729 -iquote <dir> Add <dir> to the end of the quote include path
732 C ObjC C++ ObjC++ Joined Separate
733 -iwithprefix <dir> Add <dir> to the end of the system include path
736 C ObjC C++ ObjC++ Joined Separate
737 -iwithprefixbefore <dir> Add <dir> to the end of the main include path
743 C ObjC C++ ObjC++ Undocumented
747 Do not search standard system include directories (those specified with -isystem will still be used)
751 Do not search standard system include directories for C++
754 C ObjC C++ ObjC++ Joined Separate
755 ; Documented in common.opt
759 ; Documented in common.opt
763 ; Documented in common.opt
765 print-objc-runtime-info
767 Generate C header of platform-specific features
771 Remap file names when including files
775 Conform to the ISO 1998 C++ standard
779 Conform to the ISO 1990 C standard
783 Conform to the ISO 1999 C standard
787 Deprecated in favor of -std=c99
791 Conform to the ISO 1998 C++ standard with GNU extensions
795 Conform to the ISO 1990 C standard with GNU extensions
799 Conform to the ISO 1999 C standard with GNU extensions
803 Deprecated in favor of -std=gnu99
807 Conform to the ISO 1990 C standard
811 Conform to the ISO 1990 C standard as amended in 1994
815 Conform to the ISO 1999 C standard
819 Deprecated in favor of -std=iso9899:1999
823 Enable traditional preprocessing
827 -trigraphs Support ISO C trigraphs
831 Do not predefine system-specific and GCC-specific macros
835 Enable verbose output
839 ; Documented in common.opt
841 ; This comment is to ensure we retain the blank line above.