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invoke.texi (Overall Options): Document --help=. 

* doc/invoke.texi (Overall Options): Document --help=.                                                        
* gcc.c (target_help_flag): Rename to print_subprocess_flag.                                                  
  (cc1_options): Pass --help= on to cc1.                                                                      
  (display_help): Add description of --help=.                                                                 
  (process_command): Add code to handle --help=.  Allow translated                                            
  --help and --target-help switches to be passed on to compiler sub-process.                                                                                               
  (main): Remove unused if statement.                                                                         
* opts.c (columns): Remove.                                                                                   
  (LEFT_COLUMN): Define.                                                                                      
  (wrap_help): Add columns argument.                                                                          
  (print_filtered_help): Change parameters to be an include bitmask,                                          
  an exclude bitmask, an any bitmask and the column width.  Move the                                          
  code to display the params list here.  Add code to display the                                              
  status of options rather than their descriptions if the quiet flag                                          
  is not active.                                                                                              
  (print_specific_help): Change parameters to be an include bitmask,                                          
  an exclude bitmask and an any bitmask.  Move code to look up the                                            
  column width here.  Decide upon the title for an options listing.                                           
  (common_handle_options): Add code to handle --help=.  Adapt code                                            
  for --help and --target-help to use the revised form of the                                                 
  print_specific_help function.                                                                               
  (print_help): Delete.                                                                                       
  (print_param_help): Delete.                                                                                 
  (print_switch): Delete.                                                                                     
* opts.h (cl_lang_count): Add prototype.                                                                      
 (CL_PARAMS, CL_WARNING, CL_OPTIMIZATION, CL_MIN_OPTION_CLASS, CL_MAX_OPTION_CLASS): New defines.            
* optc-gen.awk: Add construction of cl_lang_count.                                                            
* c.opt: Add Warning attribute to warning options and Optimization attribute to optimization options.         
* common.opt: Likewise.                                                                                       
  Add --help=.                                                                                                
  Add -fhelp and -ftarget-help as aliases for the transformed --help and --target-help options.               
* opt-functions.awk: Add code to handle Warning and Optimization attributes.

From-SVN: r121849
This commit is contained in:
Nick Clifton 2007-02-12 16:25:14 +00:00 committed by Nick Clifton
parent dfcbeaa576
commit c662432e8c
11 changed files with 895 additions and 575 deletions
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40
gcc/ChangeLog
View File

@ -1,3 +1,43 @@
2007-02-12 Nick Clifton <nickc@redhat.com>
* doc/invoke.texi (Overall Options): Document --help=.
* gcc.c (target_help_flag): Rename to print_subprocess_flag.
(cc1_options): Pass --help= on to cc1.
(display_help): Add description of --help=.
(process_command): Add code to handle --help=. Allow translated
--help and --target-help switches to be passed on to compiler
sub-process.
(main): Remove unused if statement.
* opts.c (columns): Remove.
(LEFT_COLUMN): Define.
(wrap_help): Add columns argument.
(print_filtered_help): Change parameters to be an include bitmask,
an exclude bitmask, an any bitmask and the column width. Move the
code to display the params list here. Add code to display the
status of options rather than their descriptions if the quiet flag
is not active.
(print_specific_help): Change parameters to be an include bitmask,
an exclude bitmask and an any bitmask. Move code to look up the
column width here. Decide upon the title for an options listing.
(common_handle_options): Add code to handle --help=. Adapt code
for --help and --target-help to use the revised form of the
print_specific_help function.
(print_help): Delete.
(print_param_help): Delete.
(print_switch): Delete.
* opts.h (cl_lang_count): Add prototype.
(CL_PARAMS, CL_WARNING, CL_OPTIMIZATION, CL_MIN_OPTION_CLASS,
CL_MAX_OPTION_CLASS): New defines.
* optc-gen.awk: Add construction of cl_lang_count.
* c.opt: Add Warning attribute to warning options and Optimization
attribute to optimization options.
* common.opt: Likewise.
Add --help=.
Add -fhelp and -ftarget-help as aliases for the transformed --help
and --target-help options.
* opt-functions.awk: Add code to handle Warning and Optimization
attributes.
2007-02-12 Richard Henderson <rth@redhat.com>
* config/alpha/constraints.md: New file.

178
gcc/c.opt
View File

@ -113,23 +113,23 @@ C ObjC C++ ObjC++ Joined Separate
-U<macro> Undefine <macro>
Wabi
C++ ObjC++ Var(warn_abi)
C++ ObjC++ Var(warn_abi) Warning
Warn about things that will change when compiling with an ABI-compliant compiler
Wall
C ObjC C++ ObjC++
C ObjC C++ ObjC++ Warning
Enable most warning messages
Wassign-intercept
ObjC ObjC++ Var(warn_assign_intercept)
ObjC ObjC++ Var(warn_assign_intercept) Warning
Warn whenever an Objective-C assignment is being intercepted by the garbage collector
Wbad-function-cast
C ObjC Var(warn_bad_function_cast)
C ObjC Var(warn_bad_function_cast) Warning
Warn about casting functions to incompatible types
Wc++-compat
C Var(warn_cxx_compat)
C Var(warn_cxx_compat) Warning
Warn about C constructs that are not in the common subset of C and C++
Wc++0x-compat
@ -137,55 +137,55 @@ C++ ObjC++ Var(warn_cxx0x_compat)
Warn about C++ constructs whose meaning differs between ISO C++ 1998 and ISO C++ 200x
Wcast-qual
C ObjC C++ ObjC++ Var(warn_cast_qual)
C ObjC C++ ObjC++ Var(warn_cast_qual) Warning
Warn about casts which discard qualifiers
Wchar-subscripts
C ObjC C++ ObjC++ Var(warn_char_subscripts)
C ObjC C++ ObjC++ Var(warn_char_subscripts) Warning
Warn about subscripts whose type is \"char\"
Wclobbered
C ObjC C++ ObjC++ Var(warn_clobbered) Init(-1)
C ObjC C++ ObjC++ Var(warn_clobbered) Init(-1) Warning
Warn about variables that might be changed by \"longjmp\" or \"vfork\"
Wcomment
C ObjC C++ ObjC++
C ObjC C++ ObjC++ Warning
Warn about possibly nested block comments, and C++ comments spanning more than one physical line
Wcomments
C ObjC C++ ObjC++
C ObjC C++ ObjC++ Warning
Synonym for -Wcomment
Wconversion
C ObjC C++ ObjC++ Var(warn_conversion)
C ObjC C++ ObjC++ Var(warn_conversion) Warning
Warn for implicit type conversions that may change a value
Wctor-dtor-privacy
C++ ObjC++ Var(warn_ctor_dtor_privacy)
C++ ObjC++ Var(warn_ctor_dtor_privacy) Warning
Warn when all constructors and destructors are private
Wdeclaration-after-statement
C ObjC Var(warn_declaration_after_statement)
C ObjC Var(warn_declaration_after_statement) Warning
Warn when a declaration is found after a statement
Wdeprecated
C++ ObjC++ Var(warn_deprecated) Init(1)
C++ ObjC++ Var(warn_deprecated) Init(1) Warning
Warn about deprecated compiler features
Wdiv-by-zero
C ObjC C++ Var(warn_div_by_zero) Init(1)
C ObjC C++ Var(warn_div_by_zero) Init(1) Warning
Warn about compile-time integer division by zero
Weffc++
C++ ObjC++ Var(warn_ecpp)
C++ ObjC++ Var(warn_ecpp) Warning
Warn about violations of Effective C++ style rules
Wempty-body
C ObjC C++ ObjC++ Var(warn_empty_body) Init(-1)
C ObjC C++ ObjC++ Var(warn_empty_body) Init(-1) Warning
Warn about an empty body in an if or else statement
Wendif-labels
C ObjC C++ ObjC++
C ObjC C++ ObjC++ Warning
Warn about stray tokens after #elif and #endif
Werror
@ -193,53 +193,53 @@ C ObjC C++ ObjC++
; Documented in common.opt
Werror-implicit-function-declaration
C ObjC RejectNegative
C ObjC RejectNegative Warning
Make implicit function declarations an error
Wfloat-equal
C ObjC C++ ObjC++ Var(warn_float_equal)
C ObjC C++ ObjC++ Var(warn_float_equal) Warning
Warn if testing floating point numbers for equality
Wformat
C ObjC C++ ObjC++
C ObjC C++ ObjC++ Warning
Warn about printf/scanf/strftime/strfmon format string anomalies
Wformat-extra-args
C ObjC C++ ObjC++ Var(warn_format_extra_args)
C ObjC C++ ObjC++ Var(warn_format_extra_args) Warning
Warn if passing too many arguments to a function for its format string
Wformat-nonliteral
C ObjC C++ ObjC++ Var(warn_format_nonliteral)
C ObjC C++ ObjC++ Var(warn_format_nonliteral) Warning
Warn about format strings that are not literals
Wformat-security
C ObjC C++ ObjC++ Var(warn_format_security)
C ObjC C++ ObjC++ Var(warn_format_security) Warning
Warn about possible security problems with format functions
Wformat-y2k
C ObjC C++ ObjC++ Var(warn_format_y2k)
C ObjC C++ ObjC++ Var(warn_format_y2k) Warning
Warn about strftime formats yielding 2-digit years
Wformat-zero-length
C ObjC Var(warn_format_zero_length)
C ObjC Var(warn_format_zero_length) Warning
Warn about zero-length formats
Wformat=
C ObjC C++ ObjC++ Joined
C ObjC C++ ObjC++ Joined Warning
Winit-self
C ObjC C++ ObjC++ Var(warn_init_self)
C ObjC C++ ObjC++ Var(warn_init_self) Warning
Warn about variables which are initialized to themselves
Wimplicit
C ObjC C++ ObjC++
C ObjC C++ ObjC++ Warning
Wimplicit-function-declaration
C ObjC Var(mesg_implicit_function_declaration) Init(-1)
C ObjC Var(mesg_implicit_function_declaration) Init(-1) Warning
Warn about implicit function declarations
Wimplicit-int
C ObjC Var(warn_implicit_int)
C ObjC Var(warn_implicit_int) Warning
Warn when a declaration does not specify a type
Wimport
@ -247,211 +247,211 @@ C ObjC C++ ObjC++
Deprecated. This switch has no effect
Wint-to-pointer-cast
C ObjC Var(warn_int_to_pointer_cast) Init(1)
C ObjC Var(warn_int_to_pointer_cast) Init(1) Warning
Warn when there is a cast to a pointer from an integer of a different size
Winvalid-offsetof
C++ ObjC++ Var(warn_invalid_offsetof) Init(1)
C++ ObjC++ Var(warn_invalid_offsetof) Init(1) Warning
Warn about invalid uses of the \"offsetof\" macro
Winvalid-pch
C ObjC C++ ObjC++
C ObjC C++ ObjC++ Warning
Warn about PCH files that are found but not used
Wlong-long
C ObjC C++ ObjC++ Var(warn_long_long) Init(1)
C ObjC C++ ObjC++ Var(warn_long_long) Init(1) Warning
Do not warn about using \"long long\" when -pedantic
Wmain
C ObjC
C ObjC Warning
Warn about suspicious declarations of \"main\"
Wmissing-braces
C ObjC C++ ObjC++ Var(warn_missing_braces)
C ObjC C++ ObjC++ Var(warn_missing_braces) Warning
Warn about possibly missing braces around initializers
Wmissing-declarations
C ObjC C++ ObjC++ Var(warn_missing_declarations)
C ObjC C++ ObjC++ Var(warn_missing_declarations) Warning
Warn about global functions without previous declarations
Wmissing-field-initializers
C ObjC C++ ObjC++ Var(warn_missing_field_initializers) Init(-1)
C ObjC C++ ObjC++ Var(warn_missing_field_initializers) Init(-1) Warning
Warn about missing fields in struct initializers
Wmissing-format-attribute
C ObjC C++ ObjC++ Var(warn_missing_format_attribute)
C ObjC C++ ObjC++ Var(warn_missing_format_attribute) Warning
Warn about functions which might be candidates for format attributes
Wmissing-include-dirs
C ObjC C++ ObjC++
C ObjC C++ ObjC++ Warning
Warn about user-specified include directories that do not exist
Wmissing-parameter-type
C ObjC Var(warn_missing_parameter_type) Init(-1)
C ObjC Var(warn_missing_parameter_type) Init(-1) Warning
Warn about function parameters declared without a type specifier in K&R-style functions
Wmissing-prototypes
C ObjC Var(warn_missing_prototypes)
C ObjC Var(warn_missing_prototypes) Warning
Warn about global functions without prototypes
Wmultichar
C ObjC C++ ObjC++
C ObjC C++ ObjC++ Warning
Warn about use of multi-character character constants
Wnested-externs
C ObjC Var(warn_nested_externs)
C ObjC Var(warn_nested_externs) Warning
Warn about \"extern\" declarations not at file scope
Wnon-template-friend
C++ ObjC++ Var(warn_nontemplate_friend) Init(1)
C++ ObjC++ Var(warn_nontemplate_friend) Init(1) Warning
Warn when non-templatized friend functions are declared within a template
Wnon-virtual-dtor
C++ ObjC++ Var(warn_nonvdtor)
C++ ObjC++ Var(warn_nonvdtor) Warning
Warn about non-virtual destructors
Wnonnull
C ObjC Var(warn_nonnull)
C ObjC Var(warn_nonnull) Warning
Warn about NULL being passed to argument slots marked as requiring non-NULL
Wnormalized=
C ObjC C++ ObjC++ Joined
C ObjC C++ ObjC++ Joined Warning
-Wnormalized=<id|nfc|nfkc> Warn about non-normalised Unicode strings
Wold-style-cast
C++ ObjC++ Var(warn_old_style_cast)
C++ ObjC++ Var(warn_old_style_cast) Warning
Warn if a C-style cast is used in a program
Wold-style-declaration
C ObjC Var(warn_old_style_declaration) Init(-1)
C ObjC Var(warn_old_style_declaration) Init(-1) Warning
Warn for obsolescent usage in a declaration
Wold-style-definition
C ObjC Var(warn_old_style_definition)
C ObjC Var(warn_old_style_definition) Warning
Warn if an old-style parameter definition is used
Woverlength-strings
C ObjC C++ ObjC++ Var(warn_overlength_strings) Init(-1)
C ObjC C++ ObjC++ Var(warn_overlength_strings) Init(-1) Warning
Warn if a string is longer than the maximum portable length specified by the standard
Woverloaded-virtual
C++ ObjC++ Var(warn_overloaded_virtual)
C++ ObjC++ Var(warn_overloaded_virtual) Warning
Warn about overloaded virtual function names
Woverride-init
C ObjC Var(warn_override_init) Init(-1)
C ObjC Var(warn_override_init) Init(-1) Warning
Warn about overriding initializers without side effects
Wparentheses
C ObjC C++ ObjC++ Var(warn_parentheses)
C ObjC C++ ObjC++ Var(warn_parentheses) Warning
Warn about possibly missing parentheses
Wpmf-conversions
C++ ObjC++ Var(warn_pmf2ptr) Init(1)
C++ ObjC++ Var(warn_pmf2ptr) Init(1) Warning
Warn when converting the type of pointers to member functions
Wpointer-arith
C ObjC C++ ObjC++ Var(warn_pointer_arith)
C ObjC C++ ObjC++ Var(warn_pointer_arith) Warning
Warn about function pointer arithmetic
Wpointer-to-int-cast
C ObjC Var(warn_pointer_to_int_cast) Init(1)
C ObjC Var(warn_pointer_to_int_cast) Init(1) Warning
Warn when a pointer is cast to an integer of a different size
Wpragmas
C ObjC C++ ObjC++ Var(warn_pragmas) Init(1)
C ObjC C++ ObjC++ Var(warn_pragmas) Init(1) Warning
Warn about misuses of pragmas
Wprotocol
ObjC ObjC++ Var(warn_protocol) Init(1)
ObjC ObjC++ Var(warn_protocol) Init(1) Warning
Warn if inherited methods are unimplemented
Wredundant-decls
C ObjC C++ ObjC++ Var(warn_redundant_decls)
C ObjC C++ ObjC++ Var(warn_redundant_decls) Warning
Warn about multiple declarations of the same object
Wreorder
C++ ObjC++ Var(warn_reorder)
C++ ObjC++ Var(warn_reorder) Warning
Warn when the compiler reorders code
Wreturn-type
C ObjC C++ ObjC++ Var(warn_return_type)
C ObjC C++ ObjC++ Var(warn_return_type) Warning
Warn whenever a function's return type defaults to \"int\" (C), or about inconsistent return types (C++)
Wselector
ObjC ObjC++ Var(warn_selector)
ObjC ObjC++ Var(warn_selector) Warning
Warn if a selector has multiple methods
Wsequence-point
C ObjC C++ ObjC++ Var(warn_sequence_point)
C ObjC C++ ObjC++ Var(warn_sequence_point) Warning
Warn about possible violations of sequence point rules
Wsign-compare
C ObjC C++ ObjC++ Var(warn_sign_compare) Init(-1)
C ObjC C++ ObjC++ Var(warn_sign_compare) Init(-1) Warning
Warn about signed-unsigned comparisons
Wsign-promo
C++ ObjC++ Var(warn_sign_promo)
C++ ObjC++ Var(warn_sign_promo) Warning
Warn when overload promotes from unsigned to signed
Wstrict-null-sentinel
C++ ObjC++
C++ ObjC++ Warning
Warn about uncasted NULL used as sentinel
Wstrict-prototypes
C ObjC Var(warn_strict_prototypes)
C ObjC Var(warn_strict_prototypes) Warning
Warn about unprototyped function declarations
Wstrict-selector-match
ObjC ObjC++ Var(warn_strict_selector_match)
ObjC ObjC++ Var(warn_strict_selector_match) Warning
Warn if type signatures of candidate methods do not match exactly
Wsynth
C++ ObjC++ Var(warn_synth)
C++ ObjC++ Var(warn_synth) Warning
Warn when synthesis behavior differs from Cfront
Wsystem-headers
C ObjC C++ ObjC++
C ObjC C++ ObjC++ Warning
Do not suppress warnings from system headers
Wtraditional
C ObjC Var(warn_traditional)
C ObjC Var(warn_traditional) Warning
Warn about features not present in traditional C
Wtraditional-conversion
C ObjC Var(warn_traditional_conversion)
C ObjC Var(warn_traditional_conversion) Warning
Warn of prototypes causing type conversions different from what would happen in the absence of prototype
Wtrigraphs
C ObjC C++ ObjC++
C ObjC C++ ObjC++ Warning
Warn if trigraphs are encountered that might affect the meaning of the program
Wundeclared-selector
ObjC ObjC++ Var(warn_undeclared_selector)
ObjC ObjC++ Var(warn_undeclared_selector) Warning
Warn about @selector()s without previously declared methods
Wundef
C ObjC C++ ObjC++
C ObjC C++ ObjC++ Warning
Warn if an undefined macro is used in an #if directive
Wunknown-pragmas
C ObjC C++ ObjC++
C ObjC C++ ObjC++ Warning
Warn about unrecognized pragmas
Wunused-macros
C ObjC C++ ObjC++
C ObjC C++ ObjC++ Warning
Warn about macros defined in the main file that are not used
Wvariadic-macros
C ObjC C++ ObjC++
C ObjC C++ ObjC++ Warning
Do not warn about using variadic macros when -pedantic
Wwrite-strings
C ObjC C++ ObjC++ Var(warn_write_strings)
C ObjC C++ ObjC++ Var(warn_write_strings) Warning
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.
Wpointer-sign
C ObjC Var(warn_pointer_sign) Init(-1)
C ObjC Var(warn_pointer_sign) Init(-1) Warning
Warn when a pointer differs in signedness in an assignment
ansi
@ -554,7 +554,7 @@ fguiding-decls
C++ ObjC++
fhandle-exceptions
C++ ObjC++
C++ ObjC++ Optimization
fhonor-std
C++ ObjC++
@ -675,19 +675,19 @@ C++ ObjC++
Enable automatic template instantiation
frtti
C++ ObjC++
C++ ObjC++ Optimization
Generate run time type descriptor information
fshort-double
C ObjC C++ ObjC++
C ObjC C++ ObjC++ Optimization
Use the same size for double as for float
fshort-enums
C ObjC C++ ObjC++
C ObjC C++ ObjC++ Optimization
Use the narrowest integer type possible for enumeration types
fshort-wchar
C ObjC C++ ObjC++
C ObjC C++ ObjC++ Optimization
Force the underlying type for \"wchar_t\" to be \"unsigned short\"
fsigned-bitfields
@ -720,7 +720,7 @@ fthis-is-variable
C++ ObjC++
fthreadsafe-statics
C++ ObjC++
C++ ObjC++ Optimization
-fno-threadsafe-statics Do not generate thread-safe code for initializing local statics
funsigned-bitfields

343
gcc/common.opt
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@ -27,12 +27,29 @@
Common
Display this information
-param
Common Separate
--param <param>=<value> Set parameter <param> to value. See below for a complete list of parameters
-help=
Common Report Joined
--help=<class> Display descriptions of a specific class of options. <class> is one or more of optimizers, target, warnings, undocumented, params
-target-help
Common
Alias for --help=target
;; The following three entries are to work around the gcc driver
;; program's insatiable desire to turn options starting with a
;; double dash (--) into options starting with a dash f (-f).
fhelp
Common
fhelp=
Common Joined
ftarget-help
Common
-param
Common Separate
--param <param>=<value> Set parameter <param> to value. See below for a complete list of parameters
-version
Common
@ -54,11 +71,11 @@ Common RejectNegative
This switch is deprecated; use -Wextra instead
Waggregate-return
Common Var(warn_aggregate_return)
Common Var(warn_aggregate_return) Warning
Warn about returning structures, unions or arrays
Walways-true
Common Var(warn_always_true)
Common Var(warn_always_true) Warning
Warn about comparisons that always evaluate to true
Warray-bounds
@ -66,19 +83,19 @@ Common Var(warn_array_bounds)
Warn if an array is accessed out of bounds
Wattributes
Common Var(warn_attributes) Init(1)
Common Var(warn_attributes) Init(1) Warning
Warn about inappropriate attribute usage
Wcast-align
Common Var(warn_cast_align)
Common Var(warn_cast_align) Warning
Warn about pointer casts which increase alignment
Wdeprecated-declarations
Common Var(warn_deprecated_decl) Init(1)
Common Var(warn_deprecated_decl) Init(1) Warning
Warn about uses of __attribute__((deprecated)) declarations
Wdisabled-optimization
Common Var(warn_disabled_optimization)
Common Var(warn_disabled_optimization) Warning
Warn when an optimization pass is disabled
Werror
@ -90,7 +107,7 @@ Common Joined
Treat specified warning as error
Wextra
Common
Common Warning
Print extra (possibly unwanted) warnings
Wfatal-errors
@ -98,103 +115,103 @@ Common Var(flag_fatal_errors)
Exit on the first error occurred
Winline
Common Var(warn_inline)
Common Var(warn_inline) Warning
Warn when an inlined function cannot be inlined
Wlarger-than-
Common RejectNegative Joined UInteger
Common RejectNegative Joined UInteger Warning
-Wlarger-than-<number> Warn if an object is larger than <number> bytes
Wunsafe-loop-optimizations
Common Var(warn_unsafe_loop_optimizations)
Common Var(warn_unsafe_loop_optimizations) Warning
Warn if the loop cannot be optimized due to nontrivial assumptions.
Wmissing-noreturn
Common Var(warn_missing_noreturn)
Common Var(warn_missing_noreturn) Warning
Warn about functions which might be candidates for __attribute__((noreturn))
Woverflow
Common Var(warn_overflow) Init(1)
Common Var(warn_overflow) Init(1) Warning
Warn about overflow in arithmetic expressions
Wpacked
Common Var(warn_packed)
Common Var(warn_packed) Warning
Warn when the packed attribute has no effect on struct layout
Wpadded
Common Var(warn_padded)
Common Var(warn_padded) Warning
Warn when padding is required to align structure members
Wshadow
Common Var(warn_shadow)
Common Var(warn_shadow) Warning
Warn when one local variable shadows another
Wstack-protector
Common Var(warn_stack_protect)
Common Var(warn_stack_protect) Warning
Warn when not issuing stack smashing protection for some reason
Wstrict-aliasing
Common
Common Warning
Warn about code which might break strict aliasing rules
Wstrict-aliasing=
Common Joined UInteger
Common Joined UInteger Warning
Warn about code which might break strict aliasing rules
Wstring-literal-comparison
Common Var(warn_string_literal_comparison)
Common Var(warn_string_literal_comparison) Warning
Warn about comparisons to constant string literals
Wswitch
Common Var(warn_switch)
Common Var(warn_switch) Warning
Warn about enumerated switches, with no default, missing a case
Wswitch-default
Common Var(warn_switch_default)
Common Var(warn_switch_default) Warning
Warn about enumerated switches missing a \"default:\" statement
Wswitch-enum
Common Var(warn_switch_enum)
Common Var(warn_switch_enum) Warning
Warn about all enumerated switches missing a specific case
Wsystem-headers
Common Var(warn_system_headers)
Common Var(warn_system_headers) Warning
Do not suppress warnings from system headers
Wuninitialized
Common Var(warn_uninitialized)
Common Var(warn_uninitialized) Warning
Warn about uninitialized automatic variables
Wunreachable-code
Common Var(warn_notreached)
Common Var(warn_notreached) Warning
Warn about code that will never be executed
Wunused
Common
Common Warning
Enable all -Wunused- warnings
Wunused-function
Common Var(warn_unused_function)
Common Var(warn_unused_function) Warning
Warn when a function is unused
Wunused-label
Common Var(warn_unused_label)
Common Var(warn_unused_label) Warning
Warn when a label is unused
Wunused-parameter
Common Var(warn_unused_parameter)
Common Var(warn_unused_parameter) Warning
Warn when a function parameter is unused
Wunused-value
Common Var(warn_unused_value)
Common Var(warn_unused_value) Warning
Warn when an expression value is unused
Wunused-variable
Common Var(warn_unused_variable)
Common Var(warn_unused_variable) Warning
Warn when a variable is unused
Wvolatile-register-var
Common Var(warn_register_var)
Common Var(warn_register_var) Warning
Warn when a register variable is declared volatile
Wcoverage-mismatch
@ -244,21 +261,21 @@ falign-functions=
Common RejectNegative Joined UInteger
falign-jumps
Common Report Var(align_jumps,0)
Common Report Var(align_jumps,0) Optimization
Align labels which are only reached by jumping
falign-jumps=
Common RejectNegative Joined UInteger
falign-labels
Common Report Var(align_labels,0)
Common Report Var(align_labels,0) Optimization
Align all labels
falign-labels=
Common RejectNegative Joined UInteger
falign-loops
Common Report Var(align_loops)
Common Report Var(align_loops) Optimization
Align the start of loops
falign-loops=
@ -273,23 +290,23 @@ Common RejectNegative Joined UInteger
; 3 if pointer arguments may not alias anything. True in Fortran.
; Set by the front end.
fargument-alias
Common Report Var(flag_argument_noalias,0)
Common Report Var(flag_argument_noalias,0) Optimization
Specify that arguments may alias each other and globals
fargument-noalias
Common Report Var(flag_argument_noalias,1) VarExists
Common Report Var(flag_argument_noalias,1) VarExists Optimization
Assume arguments may alias globals but not each other
fargument-noalias-global
Common Report Var(flag_argument_noalias,2) VarExists
Common Report Var(flag_argument_noalias,2) VarExists Optimization
Assume arguments alias neither each other nor globals
fargument-noalias-anything
Common Report Var(flag_argument_noalias,3) VarExists
Common Report Var(flag_argument_noalias,3) VarExists Optimization
Assume arguments alias no other storage
fasynchronous-unwind-tables
Common Report Var(flag_asynchronous_unwind_tables)
Common Report Var(flag_asynchronous_unwind_tables) Optimization
Generate unwind tables that are exact at each instruction boundary
; -fcheck-bounds causes gcc to generate array bounds checks.
@ -301,23 +318,23 @@ Common Report Var(flag_bounds_check)
Generate code to check bounds before indexing arrays
fbranch-count-reg
Common Report Var(flag_branch_on_count_reg) Init(1)
Common Report Var(flag_branch_on_count_reg) Init(1) Optimization
Replace add, compare, branch with branch on count register
fbranch-probabilities
Common Report Var(flag_branch_probabilities)
Common Report Var(flag_branch_probabilities) Optimization
Use profiling information for branch probabilities
fbranch-target-load-optimize
Common Report Var(flag_branch_target_load_optimize)
Common Report Var(flag_branch_target_load_optimize) Optimization
Perform branch target load optimization before prologue / epilogue threading
fbranch-target-load-optimize2
Common Report Var(flag_branch_target_load_optimize2)
Common Report Var(flag_branch_target_load_optimize2) Optimization
Perform branch target load optimization after prologue / epilogue threading
fbtr-bb-exclusive
Common Report Var(flag_btr_bb_exclusive)
Common Report Var(flag_btr_bb_exclusive) Optimization
Restrict target load migration not to re-use registers in any basic block
fcall-saved-
@ -332,49 +349,49 @@ Common Joined RejectNegative
; be saved across function calls, if that produces overall better code.
; Optional now, so people can test it.
fcaller-saves
Common Report Var(flag_caller_saves)
Common Report Var(flag_caller_saves) Optimization
Save registers around function calls
fcommon
Common Report Var(flag_no_common,0)
Common Report Var(flag_no_common,0) Optimization
Do not put uninitialized globals in the common section
fcprop-registers
Common Report Var(flag_cprop_registers)
Common Report Var(flag_cprop_registers) Optimization
Perform a register copy-propagation optimization pass
fcrossjumping
Common Report Var(flag_crossjumping)
Common Report Var(flag_crossjumping) Optimization
Perform cross-jumping optimization
fcse-follow-jumps
Common Report Var(flag_cse_follow_jumps)
Common Report Var(flag_cse_follow_jumps) Optimization
When running CSE, follow jumps to their targets
fcse-skip-blocks
Common Report Var(flag_cse_skip_blocks)
Common Report Var(flag_cse_skip_blocks) Optimization
When running CSE, follow conditional jumps
fcx-limited-range
Common Report Var(flag_cx_limited_range)
Common Report Var(flag_cx_limited_range) Optimization
Omit range reduction step when performing complex division
fdata-sections
Common Report Var(flag_data_sections)
Common Report Var(flag_data_sections) Optimization
Place data items into their own section
; Nonzero for -fdefer-pop: don't pop args after each function call
; instead save them up to pop many calls' args with one insns.
fdefer-pop
Common Report Var(flag_defer_pop)
Common Report Var(flag_defer_pop) Optimization
Defer popping functions args from stack until later
fdelayed-branch
Common Report Var(flag_delayed_branch)
Common Report Var(flag_delayed_branch) Optimization
Attempt to fill delay slots of branch instructions
fdelete-null-pointer-checks
Common Report Var(flag_delete_null_pointer_checks)
Common Report Var(flag_delete_null_pointer_checks) Optimization
Delete useless null pointer checks
fdiagnostics-show-location=
@ -398,7 +415,7 @@ Common Report Var(flag_dump_unnumbered) VarExists
Suppress output of instruction numbers, line number notes and addresses in debugging dumps
fearly-inlining
Common Report Var(flag_early_inlining) Init(1)
Common Report Var(flag_early_inlining) Init(1) Optimization
Perform early inlining
feliminate-dwarf2-dups
@ -418,18 +435,18 @@ Common Report Var(flag_emit_class_debug_always) Init(1)
Do not suppress C++ class debug information.
fexceptions
Common Report Var(flag_exceptions)
Common Report Var(flag_exceptions) Optimization
Enable exception handling
fexpensive-optimizations
Common Report Var(flag_expensive_optimizations)
Common Report Var(flag_expensive_optimizations) Optimization
Perform a number of minor, expensive optimizations
ffast-math
Common
ffinite-math-only
Common Report Var(flag_finite_math_only)
Common Report Var(flag_finite_math_only) Optimization
Assume no NaNs or infinities are generated
ffixed-
@ -437,16 +454,16 @@ Common Joined RejectNegative
-ffixed-<register> Mark <register> as being unavailable to the compiler
ffloat-store
Common Report Var(flag_float_store)
Common Report Var(flag_float_store) Optimization
Don't allocate floats and doubles in extended-precision registers
; Nonzero for -fforce-addr: load memory address into a register before
; reference to memory. This makes better cse but slower compilation.
fforce-addr
Common Report Var(flag_force_addr)
Common Report Var(flag_force_addr) Optimization
Copy memory address constants into registers before use
fforward-propagate
fforward-propagate Optimization
Common Report Var(flag_forward_propagate)
Perform a forward propagation pass on RTL
@ -462,29 +479,29 @@ Common Report Var(flag_function_sections)
Place each function into its own section
fgcse
Common Report Var(flag_gcse)
Common Report Var(flag_gcse) Optimization
Perform global common subexpression elimination
fgcse-lm
Common Report Var(flag_gcse_lm) Init(1)
Common Report Var(flag_gcse_lm) Init(1) Optimization
Perform enhanced load motion during global common subexpression elimination
fgcse-sm
Common Report Var(flag_gcse_sm) Init(0)
Common Report Var(flag_gcse_sm) Init(0) Optimization
Perform store motion after global common subexpression elimination
fgcse-las
Common Report Var(flag_gcse_las) Init(0)
Common Report Var(flag_gcse_las) Init(0) Optimization
Perform redundant load after store elimination in global common subexpression
elimination
fgcse-after-reload
Common Report Var(flag_gcse_after_reload)
Common Report Var(flag_gcse_after_reload) Optimization
Perform global common subexpression elimination after register allocation
has finished
fguess-branch-probability
Common Report Var(flag_guess_branch_prob)
Common Report Var(flag_guess_branch_prob) Optimization
Enable guessing of branch probabilities
; Nonzero means ignore `#ident' directives. 0 means handle them.
@ -496,11 +513,11 @@ Common Report Var(flag_no_ident,0)
Process #ident directives
fif-conversion
Common Report Var(flag_if_conversion)
Common Report Var(flag_if_conversion) Optimization
Perform conversion of conditional jumps to branchless equivalents
fif-conversion2
Common Report Var(flag_if_conversion2)
Common Report Var(flag_if_conversion2) Optimization
Perform conversion of conditional jumps to conditional execution
; -finhibit-size-directive inhibits output of .size for ELF.
@ -521,11 +538,11 @@ Common Report Var(flag_no_inline,0) Init(2)
Pay attention to the \"inline\" keyword
finline-functions
Common Report Var(flag_inline_functions)
Common Report Var(flag_inline_functions) Optimization
Integrate simple functions into their callers
finline-functions-called-once
Common Report Var(flag_inline_functions_called_once) Init(1)
Common Report Var(flag_inline_functions_called_once) Init(1) Optimization
Integrate functions called once into their callers
finline-limit-
@ -540,31 +557,31 @@ Common Report Var(flag_instrument_function_entry_exit)
Instrument function entry and exit with profiling calls
fipa-cp
Common Report Var(flag_ipa_cp)
Common Report Var(flag_ipa_cp) Optimization
Perform Interprocedural constant propagation
fipa-pure-const
Common Report Var(flag_ipa_pure_const) Init(0)
Common Report Var(flag_ipa_pure_const) Init(0) Optimization
Discover pure and const functions
fipa-pta
Common Report Var(flag_ipa_pta) Init(0)
Common Report Var(flag_ipa_pta) Init(0) Optimization
Perform interprocedural points-to analysis
fipa-reference
Common Report Var(flag_ipa_reference) Init(0)
Common Report Var(flag_ipa_reference) Init(0) Optimization
Discover readonly and non addressable static variables
fipa-type-escape
Common Report Var(flag_ipa_type_escape) Init(0)
Common Report Var(flag_ipa_type_escape) Init(0) Optimization
Type based escape and alias analysis
fivopts
Common Report Var(flag_ivopts) Init(1)
Common Report Var(flag_ivopts) Init(1) Optimization
Optimize induction variables on trees
fjump-tables
Common Var(flag_jump_tables) Init(1)
Common Var(flag_jump_tables) Init(1) Optimization
Use jump tables for sufficiently large switch statements
fkeep-inline-functions
@ -595,11 +612,11 @@ Report on permanent memory allocation
; string constants and constants from constant pool, if 2 also constant
; variables.
fmerge-all-constants
Common Report Var(flag_merge_constants,2) Init(1)
Common Report Var(flag_merge_constants,2) Init(1) Optimization
Attempt to merge identical constants and constant variables
fmerge-constants
Common Report Var(flag_merge_constants,1) VarExists
Common Report Var(flag_merge_constants,1) VarExists Optimization
Attempt to merge identical constants across compilation units
fmessage-length=
@ -607,11 +624,11 @@ Common RejectNegative Joined UInteger
-fmessage-length=<number> Limit diagnostics to <number> characters per line. 0 suppresses line-wrapping
fmodulo-sched
Common Report Var(flag_modulo_sched)
Common Report Var(flag_modulo_sched) Optimization
Perform SMS based modulo scheduling before the first scheduling pass
fmove-loop-invariants
Common Report Var(flag_move_loop_invariants) Init(1)
Common Report Var(flag_move_loop_invariants) Init(1) Optimization
Move loop invariant computations out of loops
fmudflap
@ -627,23 +644,23 @@ Common RejectNegative Report Var(flag_mudflap_ignore_reads)
Ignore read operations when inserting mudflap instrumentation
freschedule-modulo-scheduled-loops
Common Report Var(flag_resched_modulo_sched)
Common Report Var(flag_resched_modulo_sched) Optimization
Enable/Disable the traditional scheduling in loops that already passed modulo scheduling
fnon-call-exceptions
Common Report Var(flag_non_call_exceptions)
Common Report Var(flag_non_call_exceptions) Optimization
Support synchronous non-call exceptions
fomit-frame-pointer
Common Report Var(flag_omit_frame_pointer)
Common Report Var(flag_omit_frame_pointer) Optimization
When possible do not generate stack frames
foptimize-register-move
Common Report Var(flag_regmove)
Common Report Var(flag_regmove) Optimization
Do the full register move optimization pass
foptimize-sibling-calls
Common Report Var(flag_optimize_sibling_calls)
Common Report Var(flag_optimize_sibling_calls) Optimization
Optimize sibling and tail recursive calls
fpre-ipa-mem-report
@ -655,11 +672,11 @@ Common Report Var(post_ipa_mem_report)
Report on memory allocation before interprocedural optimization
fpack-struct
Common Report Var(flag_pack_struct)
Common Report Var(flag_pack_struct) Optimization
Pack structure members together without holes
fpack-struct=
Common RejectNegative Joined UInteger
Common RejectNegative Joined UInteger Optimization
-fpack-struct=<number> Set initial maximum structure member alignment
fpcc-struct-return
@ -667,15 +684,15 @@ Common Report Var(flag_pcc_struct_return,1) VarExists
Return small aggregates in memory, not registers
fpeel-loops
Common Report Var(flag_peel_loops)
Common Report Var(flag_peel_loops) Optimization
Perform loop peeling
fpeephole
Common Report Var(flag_no_peephole,0)
Common Report Var(flag_no_peephole,0) Optimization
Enable machine specific peephole optimizations
fpeephole2
Common Report Var(flag_peephole2)
Common Report Var(flag_peephole2) Optimization
Enable an RTL peephole pass before sched2
fPIC
@ -695,7 +712,7 @@ Common Report Var(flag_pie,1) VarExists
Generate position-independent code for executables if possible (small mode)
fprefetch-loop-arrays
Common Report Var(flag_prefetch_loop_arrays)
Common Report Var(flag_prefetch_loop_arrays) Optimization
Generate prefetch instructions, if available, for arrays in loops
fprofile
@ -736,31 +753,31 @@ Common Report Var(flag_record_gcc_switches)
Record gcc command line switches in the object file.
freg-struct-return
Common Report Var(flag_pcc_struct_return,0) VarExists
Common Report Var(flag_pcc_struct_return,0) VarExists Optimization
Return small aggregates in registers
fregmove
Common Report Var(flag_regmove)
Common Report Var(flag_regmove) Optimization
Enables a register move optimization
frename-registers
Common Report Var(flag_rename_registers) Init(2)
Common Report Var(flag_rename_registers) Init(2) Optimization
Perform a register renaming optimization pass
freorder-blocks
Common Report Var(flag_reorder_blocks)
Common Report Var(flag_reorder_blocks) Optimization
Reorder basic blocks to improve code placement
freorder-blocks-and-partition
Common Report Var(flag_reorder_blocks_and_partition)
Common Report Var(flag_reorder_blocks_and_partition) Optimization
Reorder basic blocks and partition into hot and cold sections
freorder-functions
Common Report Var(flag_reorder_functions)
Common Report Var(flag_reorder_functions) Optimization
Reorder functions to improve code placement
frerun-cse-after-loop
Common Report Var(flag_rerun_cse_after_loop) Init(2)
Common Report Var(flag_rerun_cse_after_loop) Init(2) Optimization
Add a common subexpression elimination pass after loop optimizations
frerun-loop-opt
@ -768,23 +785,23 @@ Common
Does nothing. Preserved for backward compatibility.
frounding-math
Common Report Var(flag_rounding_math)
Common Report Var(flag_rounding_math) Optimization
Disable optimizations that assume default FP rounding behavior
fsched-interblock
Common Report Var(flag_schedule_interblock) Init(1)
Common Report Var(flag_schedule_interblock) Init(1) Optimization
Enable scheduling across basic blocks
fsched-spec
Common Report Var(flag_schedule_speculative) Init(1)
Common Report Var(flag_schedule_speculative) Init(1) Optimization
Allow speculative motion of non-loads
fsched-spec-load
Common Report Var(flag_schedule_speculative_load)
Common Report Var(flag_schedule_speculative_load) Optimization
Allow speculative motion of some loads
fsched-spec-load-dangerous
Common Report Var(flag_schedule_speculative_load_dangerous)
Common Report Var(flag_schedule_speculative_load_dangerous) Optimization
Allow speculative motion of more loads
fsched-verbose=
@ -792,25 +809,25 @@ Common RejectNegative Joined
-fsched-verbose=<number> Set the verbosity level of the scheduler
fsched2-use-superblocks
Common Report Var(flag_sched2_use_superblocks)
Common Report Var(flag_sched2_use_superblocks) Optimization
If scheduling post reload, do superblock scheduling
fsched2-use-traces
Common Report Var(flag_sched2_use_traces)
Common Report Var(flag_sched2_use_traces) Optimization
If scheduling post reload, do trace scheduling
fschedule-insns
Common Report Var(flag_schedule_insns)
Common Report Var(flag_schedule_insns) Optimization
Reschedule instructions before register allocation
fschedule-insns2
Common Report Var(flag_schedule_insns_after_reload)
Common Report Var(flag_schedule_insns_after_reload) Optimization
Reschedule instructions after register allocation
; sched_stalled_insns means that insns can be moved prematurely from the queue
; of stalled insns into the ready list.
fsched-stalled-insns
Common Report Var(flag_sched_stalled_insns)
Common Report Var(flag_sched_stalled_insns) Optimization
Allow premature scheduling of queued insns
fsched-stalled-insns=
@ -822,7 +839,7 @@ Common RejectNegative Joined UInteger
; premature removal from the queue of stalled insns into the ready list (has
; an effect only if the flag 'sched_stalled_insns' is set).
fsched-stalled-insns-dep
Common Report Var(flag_sched_stalled_insns_dep,1) Init(1)
Common Report Var(flag_sched_stalled_insns_dep,1) Init(1) Optimization
Set dependence distance checking in premature scheduling of queued insns
fsched-stalled-insns-dep=
@ -830,11 +847,11 @@ Common RejectNegative Joined UInteger
-fsched-stalled-insns-dep=<number> Set dependence distance checking in premature scheduling of queued insns
fsection-anchors
Common Report Var(flag_section_anchors)
Common Report Var(flag_section_anchors) Optimization
Access data in the same section from shared anchor points
frtl-abstract-sequences
Common Report Var(flag_rtl_seqabstr)
Common Report Var(flag_rtl_seqabstr) Optimization
Perform sequence abstraction optimization on RTL
fsee
@ -846,7 +863,7 @@ Common C ObjC C++ ObjC++ Report Var(flag_show_column) Init(1)
Show column numbers in diagnostics, when available. Default on
fsignaling-nans
Common Report Var(flag_signaling_nans)
Common Report Var(flag_signaling_nans) Optimization
Disable optimizations observable by IEEE signaling NaNs
fsigned-zeros
@ -854,11 +871,11 @@ Common Report Var(flag_signed_zeros) Init(1)
Disable floating point optimizations that ignore the IEEE signedness of zero
fsingle-precision-constant
Common Report Var(flag_single_precision_constant)
Common Report Var(flag_single_precision_constant) Optimization
Convert floating point constants to single precision constants
fsplit-ivs-in-unroller
Common Report Var(flag_split_ivs_in_unroller) Init(1)
Common Report Var(flag_split_ivs_in_unroller) Init(1) Optimization
Split lifetimes of induction variables when loops are unrolled
fsplit-wide-types
@ -866,7 +883,7 @@ Common Report Var(flag_split_wide_types)
Split wide types into independent registers
fvariable-expansion-in-unroller
Common Report Var(flag_variable_expansion_in_unroller)
Common Report Var(flag_variable_expansion_in_unroller) Optimization
Apply variable expansion when loops are unrolled
; Emit code to probe the stack, to help detect stack overflow; also
@ -903,7 +920,7 @@ Does nothing. Preserved for backward compatibility.
; types do not alias expressions of certain other types. Only used
; if alias analysis (in general) is enabled.
fstrict-aliasing
Common Report Var(flag_strict_aliasing)
Common Report Var(flag_strict_aliasing) Optimization
Assume strict aliasing rules apply
fstrict-overflow
@ -919,7 +936,7 @@ Common Report Var(flag_test_coverage)
Create data files needed by \"gcov\"
fthread-jumps
Common Report Var(flag_thread_jumps)
Common Report Var(flag_thread_jumps) Optimization
Perform jump threading optimizations
ftime-report
@ -931,7 +948,7 @@ Common Joined RejectNegative
-ftls-model=[global-dynamic|local-dynamic|initial-exec|local-exec] Set the default thread-local storage code generation model
ftoplevel-reorder
Common Report Var(flag_toplevel_reorder) Init(1)
Common Report Var(flag_toplevel_reorder) Init(1) Optimization
Reorder top level functions, variables, and asms
ftracer
@ -942,110 +959,114 @@ Perform superblock formation via tail duplication
; (user-visible) trap. This is the case, for example, in nonstop
; IEEE 754 arithmetic.
ftrapping-math
Common Report Var(flag_trapping_math) Init(1)
Common Report Var(flag_trapping_math) Init(1) Optimization
Assume floating-point operations can trap
ftrapv
Common Report Var(flag_trapv)
Common Report Var(flag_trapv) Optimization
Trap for signed overflow in addition, subtraction and multiplication
ftree-ccp
Common Report Var(flag_tree_ccp)
Common Report Var(flag_tree_ccp) Optimization
Enable SSA-CCP optimization on trees
ftree-store-ccp
Common Report Var(flag_tree_store_ccp)
Common Report Var(flag_tree_store_ccp) Optimization
Enable SSA-CCP optimization for stores and loads
ftree-ch
Common Report Var(flag_tree_ch)
Common Report Var(flag_tree_ch) Optimization
Enable loop header copying on trees
ftree-copyrename
Common Report Var(flag_tree_copyrename)
Common Report Var(flag_tree_copyrename) Optimization
Replace SSA temporaries with better names in copies
ftree-copy-prop
Common Report Var(flag_tree_copy_prop)
Common Report Var(flag_tree_copy_prop) Optimization
Enable copy propagation on trees
ftree-store-copy-prop
Common Report Var(flag_tree_store_copy_prop)
Common Report Var(flag_tree_store_copy_prop) Optimization
Enable copy propagation for stores and loads
ftree-dce
Common Report Var(flag_tree_dce)
Common Report Var(flag_tree_dce) Optimization
Enable SSA dead code elimination optimization on trees
ftree-dominator-opts
Common Report Var(flag_tree_dom)
Common Report Var(flag_tree_dom) Optimization
Enable dominator optimizations
ftree-dse
Common Report Var(flag_tree_dse)
Common Report Var(flag_tree_dse) Optimization
Enable dead store elimination
ftree-fre
Common Report Var(flag_tree_fre)
Common Report Var(flag_tree_fre) Optimization
Enable Full Redundancy Elimination (FRE) on trees
ftree-loop-im
Common Report Var(flag_tree_loop_im) Init(1)
Common Report Var(flag_tree_loop_im) Init(1) Optimization
Enable loop invariant motion on trees
ftree-loop-linear
Common Report Var(flag_tree_loop_linear)
Common Report Var(flag_tree_loop_linear) Optimization
Enable linear loop transforms on trees
ftree-loop-ivcanon
Common Report Var(flag_tree_loop_ivcanon) Init(1)
Common Report Var(flag_tree_loop_ivcanon) Init(1) Optimization
Create canonical induction variables in loops
ftree-loop-optimize
Common Report Var(flag_tree_loop_optimize) Init(1)
Common Report Var(flag_tree_loop_optimize) Init(1) Optimization
Enable loop optimizations on tree level
ftree-pre
Common Report Var(flag_tree_pre)
Common Report Var(flag_tree_pre) Optimization
Enable SSA-PRE optimization on trees
ftree-salias
Common Report Var(flag_tree_salias)
Common Report Var(flag_tree_salias) Optimization
Perform structural alias analysis
ftree-sink
Common Report Var(flag_tree_sink)
Common Report Var(flag_tree_sink) Optimization
Enable SSA code sinking on trees
ftree-sra
Common Report Var(flag_tree_sra)
Common Report Var(flag_tree_sra) Optimization
Perform scalar replacement of aggregates
ftree-ter
Common Report Var(flag_tree_ter)
Common Report Var(flag_tree_ter) Optimization
Replace temporary expressions in the SSA->normal pass
ftree-lrs
Common Report Var(flag_tree_live_range_split) Optimization
Perform live range splitting during the SSA->normal pass
ftree-vrp
Common Report Var(flag_tree_vrp) Init(0)
Common Report Var(flag_tree_vrp) Init(0) Optimization
Perform Value Range Propagation on trees
funit-at-a-time
Common Report Var(flag_unit_at_a_time)
Common Report Var(flag_unit_at_a_time) Optimization
Compile whole compilation unit at a time
funroll-loops
Common Report Var(flag_unroll_loops)
Common Report Var(flag_unroll_loops) Optimization
Perform loop unrolling when iteration count is known
funroll-all-loops
Common Report Var(flag_unroll_all_loops)
Common Report Var(flag_unroll_all_loops) Optimization
Perform loop unrolling for all loops
; Nonzero means that loop optimizer may assume that the induction variables
; that control loops do not overflow and that the loops with nontrivial
; exit condition are not infinite
funsafe-loop-optimizations
Common Report Var(flag_unsafe_loop_optimizations)
Common Report Var(flag_unsafe_loop_optimizations) Optimization
Allow loop optimizations to assume that the loops behave in normal way
; Nonzero means that unsafe floating-point math optimizations are allowed
@ -1053,27 +1074,27 @@ Allow loop optimizations to assume that the loops behave in normal way
; are allowed to assume that their arguments and results are "normal"
; (e.g., nonnegative for SQRT).
funsafe-math-optimizations
Common Report Var(flag_unsafe_math_optimizations)
Common Report Var(flag_unsafe_math_optimizations) Optimization
Allow math optimizations that may violate IEEE or ISO standards
funswitch-loops
Common Report Var(flag_unswitch_loops)
Common Report Var(flag_unswitch_loops) Optimization
Perform loop unswitching
funwind-tables
Common Report Var(flag_unwind_tables)
Common Report Var(flag_unwind_tables) Optimization
Just generate unwind tables for exception handling
fvar-tracking
Common Report Var(flag_var_tracking) VarExists
Common Report Var(flag_var_tracking) VarExists Optimization
Perform variable tracking
ftree-vectorize
Common Report Var(flag_tree_vectorize)
Common Report Var(flag_tree_vectorize) Optimization
Enable loop vectorization on trees
ftree-vect-loop-version
Common Report Var(flag_tree_vect_loop_version) Init(1)
Common Report Var(flag_tree_vect_loop_version) Init(1) Optimization
Enable loop versioning when doing loop vectorization on trees
ftree-vectorizer-verbose=
@ -1100,19 +1121,19 @@ Common Joined RejectNegative
fvpt
Common Report Var(flag_value_profile_transformations)
Common Report Var(flag_value_profile_transformations) Optimization
Use expression value profiles in optimizations
fweb
Common Report Var(flag_web) Init(2)
Common Report Var(flag_web) Init(2) Optimization
Construct webs and split unrelated uses of single variable
fwhole-program
Common Report Var(flag_whole_program) Init(0)
Common Report Var(flag_whole_program) Init(0) Optimization
Perform whole program optimizations
fwrapv
Common Report Var(flag_wrapv)
Common Report Var(flag_wrapv) Optimization
Assume signed arithmetic overflow wraps around
fzero-initialized-in-bss

123
gcc/doc/invoke.texi
View File

@ -160,8 +160,9 @@ in the following sections.
@table @emph
@item Overall Options
@xref{Overall Options,,Options Controlling the Kind of Output}.
@gccoptlist{-c -S -E -o @var{file} -combine -pipe -pass-exit-codes @gol
-x @var{language} -v -### --help --target-help --version @@@var{file}}
@gccoptlist{-c -S -E -o @var{file} -combine -pipe -pass-exit-codes @gol
-x @var{language} -v -### --help@r{[}=@var{class}@r{]} --target-help @gol
--version @@@var{file}}
@item C Language Options
@xref{C Dialect Options,,Options Controlling C Dialect}.
@ -1078,15 +1079,123 @@ Print (on the standard output) a description of the command line options
understood by @command{gcc}. If the @option{-v} option is also specified
then @option{--help} will also be passed on to the various processes
invoked by @command{gcc}, so that they can display the command line options
they accept. If the @option{-Wextra} option is also specified then command
line options which have no documentation associated with them will also
be displayed.
they accept. If the @option{-Wextra} option has also been specified
(prior to the @option{--help} option), then command line options which
have no documentation associated with them will also be displayed.
@item --target-help
@opindex target-help
Print (on the standard output) a description of target specific command
Print (on the standard output) a description of target-specific command
line options for each tool.
@item --help=@var{class}@r{[},@var{qualifier}@r{]}
Print (on the standard output) a description of the command line
options understood by the compiler that fit into a specific class.
The class can be one of @var{optimizers}, @var{warnings}, @var{target}
or @var{params}:
@table @gcctabopt
@item @var{optimizers}
This will display all of the optimization options supported by the
compiler.
@item @var{warnings}
This will display all of the options controlling warning messages
produced by the compiler.
@item @var{target}
This will display target-specific options. Unlike the
@option{--target-help} option however, target-specific options of the
linker and assembler will not be displayed. This is because those
tools do not currently support the extended @option{--help=} syntax.
@item @var{params}
This will display the values recognized by the @option{--param}
option.
@end table
It is possible to further refine the output of the @option{--help=}
option by adding a comma separated list of qualifiers after the
class. These can be any from the following list:
@table @gcctabopt
@item undocumented
Display only those options which are undocumented.
@item joined
Display options which take an argument that appears after an equal
sign in the same continuous piece of text, such as:
@samp{--help=target}.
@item separate
Display options which take an argument that appears as a separate word
following the original option, such as: @samp{-o output-file}.
@end table
Thus for example to display all the undocumented target-specific
switches supported by the compiler the following can be used:
@smallexample
--help=target,undocumented
@end smallexample
The sense of a qualifier can be inverted by prefixing it with the
@var{^} character, so for example to display all binary warning
options (i.e. ones that are either on or off and that do not take an
argument), which have a description the following can be used:
@smallexample
--help=warnings,^joined,^undocumented
@end smallexample
A class can also be used as a qualifier, although this usually
restricts the output by so much that there is nothing to display. One
case where it does work however is when one of the classes is
@var{target}. So for example to display all the target-specific
optimization options the following can be used:
@smallexample
--help=target,optimizers
@end smallexample
The @option{--help=} option can be repeated on the command line. Each
successive use will display its requested class of options, skipping
those that have already been displayed.
If the @option{-Q} option appears on the command line before the
@option{--help=} option, then the descriptive text displayed by
@option{--help=} is changed. Instead of describing the displayed
options, an indication is given as to whether the option is enabled,
disabled or set to a specific value (assuming that the compiler
knows this at the point where the @option{--help=} option is used).
Here is a truncated example from the ARM port of @command{gcc}:
@smallexample
% gcc -Q -mabi=2 --help=target -c
The following options are target specific:
-mabi= 2
-mabort-on-noreturn [disabled]
-mapcs [disabled]
@end smallexample
The output is sensitive to the effects of previous command line
options, so for example it is possible to find out which optimizations
are enabled at @option{-O2} by using:
@smallexample
-O2 --help=optimizers
@end smallexample
Alternatively you can discover which binary optimizations are enabled
by @option{-O3} by using:
@smallexample
gcc -c -Q -O3 --help=optimizers > /tmp/O3-opts
gcc -c -Q -O2 --help=optimizers > /tmp/O2-opts
diff /tmp/O2-opts /tmp/O3-opts | grep enabled
@end smallexample
@item --version
@opindex version
Display the version number and copyrights of the invoked GCC@.
@ -2754,7 +2863,7 @@ if a variable may be clobbered by a @code{setjmp} call.
These warnings are possible only in optimizing compilation,
because they require data flow information that is computed only
when optimizing. If you do not specify @option{-O}, you will not get
when optimizing. If you do not specify @option{-O}, you will not get
these warnings. Instead, GCC will issue a warning about @option{-Wuninitialized}
requiring @option{-O}.

4
gcc/fortran/ChangeLog
View File

@ -1,3 +1,7 @@
2007-02-12 Nick Clifton <nickc@redhat.com>
* lang.opt: Add Warning attribute to warning options.
2007-02-11 Daniel Franke <franke.daniel@gmail.com>
* intrinsic.texi (HOSTNM): Fix typographical error in syntax.

22
gcc/fortran/lang.opt
View File

@ -1,5 +1,5 @@
; Options for the Fortran 95 front end.
; Copyright (C) 2003, 2004, 2005, 2006 Free Software Foundation, Inc.
; Copyright (C) 2003, 2004, 2005, 2006, 2007 Free Software Foundation, Inc.
;
; This file is part of GCC.
;
@ -38,43 +38,43 @@ Fortran
; Documented in C
Waliasing
Fortran
Fortran Warning
Warn about possible aliasing of dummy arguments
Wampersand
Fortran
Fortran Warning
Warn about missing ampersand in continued character constants
Wcharacter-truncation
Fortran
Fortran Warning
Warn about truncated character expressions
Wconversion
Fortran
Fortran Warning
Warn about implicit conversion
Wimplicit-interface
Fortran
Fortran Warning
Warn about calls with implicit interface
Wline-truncation
Fortran
Fortran Warning
Warn about truncated source lines
Wnonstd-intrinsics
Fortran
Fortran Warning
Warn about usage of non-standard intrinsics
Wsurprising
Fortran
Fortran Warning
Warn about \"suspicious\" constructs
Wtabs
Fortran
Fortran Warning
Permit nonconforming uses of the tab character
Wunderflow
Fortran
Fortran Warning
Warn about underflow of numerical constant expressions
fall-intrinsics

64
gcc/gcc.c
View File

@ -1,7 +1,7 @@
/* Compiler driver program that can handle many languages.
Copyright (C) 1987, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006 Free Software Foundation,
Inc.
1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007
Free Software Foundation, Inc.
This file is part of GCC.
@ -179,9 +179,9 @@ static int verbose_flag;
shell scripts to capture the driver-generated command line. */
static int verbose_only_flag;
/* Flag indicating to print target specific command line options. */
/* Flag indicating how to print command line options of sub-processes. */
static int target_help_flag;
static int print_subprocess_help;
/* Flag indicating whether we should report subprocess execution times
(if this is supported by the system - see pexecute.c). */
@ -805,6 +805,7 @@ static const char *cc1_options =
%{v:-version} %{pg:-p} %{p} %{f*} %{undef}\
%{Qn:-fno-ident} %{--help:--help}\
%{--target-help:--target-help}\
%{--help=*:--help=%(VALUE)}\
%{!fsyntax-only:%{S:%W{o*}%{!o*:-o %b.s}}}\
%{fsyntax-only:-o %j} %{-param*}\
%{fmudflap|fmudflapth:-fno-builtin -fno-merge-constants}\
@ -1492,7 +1493,7 @@ static const char *const standard_exec_prefix_2 = "/usr/lib/gcc/";
static const char *md_exec_prefix = MD_EXEC_PREFIX;
static const char *md_startfile_prefix = MD_STARTFILE_PREFIX;
static const char *md_startfile_prefix_1 = MD_STARTFILE_PREFIX_1;
static const char *const standard_startfile_prefix_1
static const char *const standard_startfile_prefix_1
= STANDARD_STARTFILE_PREFIX_1;
static const char *const standard_startfile_prefix_2
= STANDARD_STARTFILE_PREFIX_2;
@ -3174,6 +3175,8 @@ display_help (void)
fputs (_(" -pass-exit-codes Exit with highest error code from a phase\n"), stdout);
fputs (_(" --help Display this information\n"), stdout);
fputs (_(" --target-help Display target specific command line options\n"), stdout);
fputs (_(" --help={target|optimizers|warnings|undocumented|params}[,{[^]joined|[^]separate}]\n"), stdout);
fputs (_(" Display specific types of command line options\n"), stdout);
if (! verbose_flag)
fputs (_(" (Use '-v --help' to display command line options of sub-processes)\n"), stdout);
fputs (_(" -dumpspecs Display all of the built in spec strings\n"), stdout);
@ -3589,10 +3592,19 @@ warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n\n"
add_assembler_option ("--help", 6);
add_linker_option ("--help", 6);
}
else if (strncmp (argv[i], "-fhelp=", 7) == 0)
{
/* translate_options () has turned --help into -fhelp. */
print_subprocess_help = 2;
/* We will be passing a dummy file on to the sub-processes. */
n_infiles++;
n_switches++;
}
else if (strcmp (argv[i], "-ftarget-help") == 0)
{
/* translate_options() has turned --target-help into -ftarget-help. */
target_help_flag = 1;
print_subprocess_help = 1;
/* We will be passing a dummy file on to the sub-processes. */
n_infiles++;
@ -4074,10 +4086,6 @@ warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n\n"
;
else if (! strcmp (argv[i], "-print-multi-os-directory"))
;
else if (! strcmp (argv[i], "-ftarget-help"))
;
else if (! strcmp (argv[i], "-fhelp"))
;
else if (! strncmp (argv[i], "--sysroot=", strlen ("--sysroot=")))
{
target_system_root = argv[i] + strlen ("--sysroot=");
@ -4243,34 +4251,14 @@ warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n\n"
error ("warning: '-x %s' after last input file has no effect", spec_lang);
/* Ensure we only invoke each subprocess once. */
if (target_help_flag || print_help_list)
if (print_subprocess_help || print_help_list)
{
n_infiles = 1;
/* Create a dummy input file, so that we can pass --target-help on to
the various sub-processes. */
/* Create a dummy input file, so that we can pass
the help option on to the various sub-processes. */
infiles[0].language = "c";
infiles[0].name = "help-dummy";
if (target_help_flag)
{
switches[n_switches].part1 = "--target-help";
switches[n_switches].args = 0;
switches[n_switches].live_cond = SWITCH_OK;
switches[n_switches].validated = 0;
n_switches++;
}
if (print_help_list)
{
switches[n_switches].part1 = "--help";
switches[n_switches].args = 0;
switches[n_switches].live_cond = SWITCH_OK;
switches[n_switches].validated = 0;
n_switches++;
}
}
switches[n_switches].part1 = 0;
@ -6421,16 +6409,6 @@ main (int argc, char **argv)
return (0);
}
if (target_help_flag)
{
/* Print if any target specific options. */
/* We do not exit here. Instead we have created a fake input file
called 'target-dummy' which needs to be compiled, and we pass this
on to the various sub-processes, along with the --target-help
switch. */
}
if (print_help_list)
{
display_help ();

4
gcc/opt-functions.awk
View File

@ -1,4 +1,4 @@
# Copyright (C) 2003,2004 Free Software Foundation, Inc.
# Copyright (C) 2003, 2004, 2007 Free Software Foundation, Inc.
# Contributed by Kelley Cook, June 2004.
# Original code from Neil Booth, May 2003.
#
@ -77,6 +77,8 @@ function switch_flags (flags)
test_flag("RejectNegative", flags, " | CL_REJECT_NEGATIVE") \
test_flag("UInteger", flags, " | CL_UINTEGER") \
test_flag("Undocumented", flags, " | CL_UNDOCUMENTED") \
test_flag("Warning", flags, " | CL_WARNING") \
test_flag("Optimization", flags, " | CL_OPTIMIZATION") \
test_flag("Report", flags, " | CL_REPORT")
sub( "^0 \\| ", "", result )
return result

3
gcc/optc-gen.awk
View File

@ -1,4 +1,4 @@
# Copyright (C) 2003,2004 Free Software Foundation, Inc.
# Copyright (C) 2003, 2004, 2007 Free Software Foundation, Inc.
# Contributed by Kelley Cook, June 2004.
# Original code from Neil Booth, May 2003.
#
@ -119,6 +119,7 @@ for (i = 0; i < n_langs; i++) {
print " 0\n};\n"
print "const unsigned int cl_options_count = N_OPTS;\n"
print "const unsigned int cl_lang_count = " n_langs ";\n"
print "const struct cl_option cl_options[] =\n{"

656
gcc/opts.c
View File

@ -83,15 +83,12 @@ enum symbol_visibility default_visibility = VISIBILITY_DEFAULT;
/* Disable unit-at-a-time for frontends that might be still broken in this
respect. */
bool no_unit_at_a_time_default;
/* Global visibility options. */
struct visibility_flags visibility_options;
/* Columns of --help display. */
static unsigned int columns = 80;
/* What to print when a switch has no documentation. */
static const char undocumented_msg[] = N_("This switch lacks documentation");
@ -115,12 +112,6 @@ static char *write_langs (unsigned int lang_mask);
static void complain_wrong_lang (const char *, const struct cl_option *,
unsigned int lang_mask);
static void handle_options (unsigned int, const char **, unsigned int);
static void wrap_help (const char *help, const char *item, unsigned int);
static void print_target_help (void);
static void print_help (void);
static void print_param_help (void);
static void print_filtered_help (unsigned int);
static unsigned int print_switch (const char *text, unsigned int indent);
static void set_debug_level (enum debug_info_type type, int extended,
const char *arg);
@ -320,7 +311,7 @@ handle_option (const char **argv, unsigned int lang_mask)
*(const char **) option->flag_var = arg;
break;
}
if (option->flags & lang_mask)
if (lang_hooks.handle_option (opt_index, arg, value) == 0)
result = 0;
@ -601,7 +592,7 @@ decode_options (unsigned int argc, const char **argv)
if (flag_exceptions && flag_reorder_blocks_and_partition)
{
inform
inform
("-freorder-blocks-and-partition does not work with exceptions");
flag_reorder_blocks_and_partition = 0;
flag_reorder_blocks = 1;
@ -626,13 +617,300 @@ decode_options (unsigned int argc, const char **argv)
&& (!targetm.have_named_sections
|| (flag_unwind_tables && targetm.unwind_tables_default)))
{
inform
inform
("-freorder-blocks-and-partition does not work on this architecture");
flag_reorder_blocks_and_partition = 0;
flag_reorder_blocks = 1;
}
}
#define LEFT_COLUMN 27
/* Output ITEM, of length ITEM_WIDTH, in the left column,
followed by word-wrapped HELP in a second column. */
static void
wrap_help (const char *help,
const char *item,
unsigned int item_width,
unsigned int columns)
{
unsigned int col_width = LEFT_COLUMN;
unsigned int remaining, room, len;
remaining = strlen (help);
do
{
room = columns - 3 - MAX (col_width, item_width);
if (room > columns)
room = 0;
len = remaining;
if (room < len)
{
unsigned int i;
for (i = 0; help[i]; i++)
{
if (i >= room && len != remaining)
break;
if (help[i] == ' ')
len = i;
else if ((help[i] == '-' || help[i] == '/')
&& help[i + 1] != ' '
&& i > 0 && ISALPHA (help[i - 1]))
len = i + 1;
}
}
printf( " %-*.*s %.*s\n", col_width, item_width, item, len, help);
item_width = 0;
while (help[len] == ' ')
len++;
help += len;
remaining -= len;
}
while (remaining);
}
/* Print help for a specific front-end, etc. */
static void
print_filtered_help (unsigned int include_flags,
unsigned int exclude_flags,
unsigned int any_flags,
unsigned int columns)
{
unsigned int i;
const char *help;
static char *printed = NULL;
bool found = false;
bool displayed = false;
if (include_flags == CL_PARAMS)
{
for (i = 0; i < LAST_PARAM; i++)
{
const char *param = compiler_params[i].option;
help = compiler_params[i].help;
if (help == NULL || *help == '\0')
{
if (exclude_flags & CL_UNDOCUMENTED)
continue;
help = undocumented_msg;
}
/* Get the translation. */
help = _(help);
wrap_help (help, param, strlen (param), columns);
}
putchar ('\n');
return;
}
if (!printed)
printed = xcalloc (1, cl_options_count);
for (i = 0; i < cl_options_count; i++)
{
static char new_help[128];
const struct cl_option *option = cl_options + i;
unsigned int len;
const char *opt;
const char *tab;
if (include_flags == 0
|| ((option->flags & include_flags) != include_flags))
{
if ((option->flags & any_flags) == 0)
continue;
}
/* Skip unwanted switches. */
if ((option->flags & exclude_flags) != 0)
continue;
found = true;
/* Skip switches that have already been printed. */
if (printed[i])
continue;
printed[i] = true;
help = option->help;
if (help == NULL)
{
if (exclude_flags & CL_UNDOCUMENTED)
continue;
help = undocumented_msg;
}
/* Get the translation. */
help = _(help);
/* Find the gap between the name of the
option and its descriptive text. */
tab = strchr (help, '\t');
if (tab)
{
len = tab - help;
opt = help;
help = tab + 1;
}
else
{
opt = option->opt_text;
len = strlen (opt);
}
/* With the -Q option enabled we change the descriptive text associated
with an option to be an indication of its current setting. */
if (!quiet_flag)
{
if (len < (LEFT_COLUMN + 2))
strcpy (new_help, "\t\t");
else
strcpy (new_help, "\t");
if (option->flag_var != NULL)
{
if (option->flags & CL_JOINED)
{
if (option->var_type == CLVC_STRING)
{
if (* (const char **) option->flag_var != NULL)
snprintf (new_help + strlen (new_help),
sizeof (new_help) - strlen (new_help),
* (const char **) option->flag_var);
}
else
sprintf (new_help + strlen (new_help),
"%#x", * (int *) option->flag_var);
}
else
strcat (new_help, option_enabled (i)
? _("[enabled]") : _("[disabled]"));
}
help = new_help;
}
wrap_help (help, opt, len, columns);
displayed = true;
}
if (! found)
printf (_(" No options with the desired characteristics were found\n"));
else if (! displayed)
printf (_(" All options with the desired characteristics have already been displayed\n"));
putchar ('\n');
}
/* Display help for a specified type of option.
The options must have ALL of the INCLUDE_FLAGS set
ANY of the flags in the ANY_FLAGS set
and NONE of the EXCLUDE_FLAGS set. */
static void
print_specific_help (unsigned int include_flags,
unsigned int exclude_flags,
unsigned int any_flags)
{
unsigned int all_langs_mask = (1U << cl_lang_count) - 1;
const char * description = NULL;
const char * descrip_extra = "";
size_t i;
unsigned int flag;
static unsigned int columns = 0;
/* Sanity check: Make sure that we do not have more
languages than we have bits available to enumerate them. */
gcc_assert ((1U << cl_lang_count) < CL_MIN_OPTION_CLASS);
/* If we have not done so already, obtain
the desired maximum width of the output. */
if (columns == 0)
{
const char *p;
GET_ENVIRONMENT (p, "COLUMNS");
if (p != NULL)
{
int value = atoi (p);
if (value > 0)
columns = value;
}
if (columns == 0)
/* Use a reasonable default. */
columns = 80;
}
/* Decide upon the title for the options that we are going to display. */
for (i = 0, flag = 1; flag <= CL_MAX_OPTION_CLASS; flag <<= 1, i ++)
{
switch (flag & include_flags)
{
case 0:
break;
case CL_TARGET:
description = _("The following options are target specific");
break;
case CL_WARNING:
description = _("The following options control compiler warning messages");
break;
case CL_OPTIMIZATION:
description = _("The following options control optimizations");
break;
case CL_COMMON:
description = _("The following options are language-independent");
break;
case CL_PARAMS:
description = _("The --param option recognizes the following as parameters");
break;
default:
if (i >= cl_lang_count)
break;
if ((exclude_flags & ((1U << cl_lang_count) - 1)) != 0)
{
description = _("The following options are specific to the language ");
descrip_extra = lang_names [i];
}
else
description = _("The following options are supported by, amoung others, the language ");
break;
}
}
if (description == NULL)
{
if (any_flags == 0)
{
if (include_flags == CL_UNDOCUMENTED)
description = _("The following options are not documented");
else
{
internal_error ("unrecognized include_flags 0x%x passed to print_specific_help",
include_flags);
return;
}
}
else
{
if (any_flags & all_langs_mask)
description = _("The following options are language-related");
else
description = _("The following options are language-independent");
}
}
printf ("%s%s:\n", description, descrip_extra);
print_filtered_help (include_flags, exclude_flags, any_flags, columns);
}
/* Handle target- and language-independent options. Return zero to
generate an "unknown option" message. Only options that need
extra handling need to be listed here; if you simply want
@ -646,20 +924,124 @@ common_handle_option (size_t scode, const char *arg, int value,
switch (code)
{
case OPT__help:
print_help ();
exit_after_options = true;
break;
case OPT__param:
handle_param (arg);
break;
case OPT_fhelp:
case OPT__help:
{
unsigned int all_langs_mask = (1U << cl_lang_count) - 1;
unsigned int undoc_mask;
unsigned int i;
undoc_mask = extra_warnings ? 0 : CL_UNDOCUMENTED;
/* First display any single language specific options. */
for (i = 0; i < cl_lang_count; i++)
print_specific_help
(1U << i, (all_langs_mask & (~ (1U << i))) | undoc_mask, 0);
/* Next display any multi language specific options. */
print_specific_help (0, undoc_mask, all_langs_mask);
/* Then display any remaining, non-language options. */
for (i = CL_MIN_OPTION_CLASS; i <= CL_MAX_OPTION_CLASS; i <<= 1)
print_specific_help (i, undoc_mask, 0);
exit_after_options = true;
break;
}
case OPT_ftarget_help:
case OPT__target_help:
print_target_help ();
print_specific_help (CL_TARGET, CL_UNDOCUMENTED, 0);
exit_after_options = true;
break;
case OPT_fhelp_:
case OPT__help_:
{
const char * a = arg;
unsigned int include_flags = 0;
/* Note - by default we include undocumented options when listing
specific classes. If you only want to see documented options
then add ",^undocumented" to the --help= option. e.g.:
--help=target,^undocumented */
unsigned int exclude_flags = 0;
/* Walk along the argument string, parsing each word in turn.
The format is:
arg = [^]{word}[,{arg}]
word = {optimizers|target|warnings|undocumented|params} */
while (* a != 0)
{
static struct
{
const char * string;
unsigned int flag;
}
specifics[] =
{
{ "optimizers", CL_OPTIMIZATION },
{ "target", CL_TARGET },
{ "warnings", CL_WARNING },
{ "undocumented", CL_UNDOCUMENTED },
{ "params", CL_PARAMS },
{ "joined", CL_JOINED },
{ "separate", CL_SEPARATE },
{ NULL, 0 }
};
unsigned int * pflags;
char * comma;
unsigned int len;
unsigned int i;
if (* a == '^')
{
++ a;
pflags = & exclude_flags;
}
else
pflags = & include_flags;
comma = strchr (a, ',');
if (comma == NULL)
len = strlen (a);
else
len = comma - a;
for (i = 0; specifics[i].string != NULL; i++)
if (strncasecmp (a, specifics[i].string, len) == 0)
{
* pflags |= specifics[i].flag;
break;
}
if (specifics[i].string == NULL)
{
/* Check to see if the string matches a language name. */
for (i = 0; i < cl_lang_count; i++)
if (strncasecmp (a, lang_names[i], len) == 0)
{
* pflags |= 1U << i;
break;
}
if (i == cl_lang_count)
fnotice (stderr,
"warning: unrecognized argument to --help= switch: %.*s\n",
len, a);
}
if (comma == NULL)
break;
a = comma + 1;
}
if (include_flags)
print_specific_help (include_flags, exclude_flags, 0);
exit_after_options = true;
break;
}
case OPT__version:
print_version (stderr, "");
exit_after_options = true;
@ -684,6 +1066,7 @@ common_handle_option (size_t scode, const char *arg, int value,
{
char *new_option;
int option_index;
new_option = XNEWVEC (char, strlen (arg) + 2);
new_option[0] = 'W';
strcpy (new_option+1, arg);
@ -819,7 +1202,7 @@ common_handle_option (size_t scode, const char *arg, int value,
case OPT_fpack_struct_:
if (value <= 0 || (value & (value - 1)) || value > 16)
error("structure alignment must be a small power of two, not %d", value);
error ("structure alignment must be a small power of two, not %d", value);
else
{
initial_max_fld_align = value;
@ -1153,238 +1536,6 @@ set_debug_level (enum debug_info_type type, int extended, const char *arg)
}
}
/* Display help for target options. */
static void
print_target_help (void)
{
unsigned int i;
static bool displayed = false;
/* Avoid double printing for --help --target-help. */
if (displayed)
return;
displayed = true;
for (i = 0; i < cl_options_count; i++)
if ((cl_options[i].flags & (CL_TARGET | CL_UNDOCUMENTED)) == CL_TARGET)
{
printf (_("\nTarget specific options:\n"));
print_filtered_help (CL_TARGET);
break;
}
}
/* Output --help text. */
static void
print_help (void)
{
size_t i;
const char *p;
GET_ENVIRONMENT (p, "COLUMNS");
if (p)
{
int value = atoi (p);
if (value > 0)
columns = value;
}
puts (_("The following options are language-independent:\n"));
print_filtered_help (CL_COMMON);
print_param_help ();
for (i = 0; lang_names[i]; i++)
{
printf (_("The %s front end recognizes the following options:\n\n"),
lang_names[i]);
print_filtered_help (1U << i);
}
print_target_help ();
}
/* Print the help for --param. */
static void
print_param_help (void)
{
size_t i;
puts (_("The --param option recognizes the following as parameters:\n"));
for (i = 0; i < LAST_PARAM; i++)
{
const char *help = compiler_params[i].help;
const char *param = compiler_params[i].option;
if (help == NULL || *help == '\0')
help = undocumented_msg;
/* Get the translation. */
help = _(help);
wrap_help (help, param, strlen (param));
}
putchar ('\n');
}
/* Print help for a specific front-end, etc. */
static void
print_filtered_help (unsigned int flag)
{
unsigned int i, len, filter, indent = 0;
bool duplicates = false;
const char *help, *opt, *tab;
static char *printed;
if (flag == CL_COMMON || flag == CL_TARGET)
{
filter = flag;
if (!printed)
printed = xmalloc (cl_options_count);
memset (printed, 0, cl_options_count);
}
else
{
/* Don't print COMMON options twice. */
filter = flag | CL_COMMON;
for (i = 0; i < cl_options_count; i++)
{
if ((cl_options[i].flags & filter) != flag)
continue;
/* Skip help for internal switches. */
if (cl_options[i].flags & CL_UNDOCUMENTED)
continue;
/* Skip switches that have already been printed, mark them to be
listed later. */
if (printed[i])
{
duplicates = true;
indent = print_switch (cl_options[i].opt_text, indent);
}
}
if (duplicates)
{
putchar ('\n');
putchar ('\n');
}
}
for (i = 0; i < cl_options_count; i++)
{
if ((cl_options[i].flags & filter) != flag)
continue;
/* Skip help for internal switches. */
if (cl_options[i].flags & CL_UNDOCUMENTED)
continue;
/* Skip switches that have already been printed. */
if (printed[i])
continue;
printed[i] = true;
help = cl_options[i].help;
if (!help)
help = undocumented_msg;
/* Get the translation. */
help = _(help);
tab = strchr (help, '\t');
if (tab)
{
len = tab - help;
opt = help;
help = tab + 1;
}
else
{
opt = cl_options[i].opt_text;
len = strlen (opt);
}
wrap_help (help, opt, len);
}
putchar ('\n');
}
/* Output ITEM, of length ITEM_WIDTH, in the left column, followed by
word-wrapped HELP in a second column. */
static unsigned int
print_switch (const char *text, unsigned int indent)
{
unsigned int len = strlen (text) + 1; /* trailing comma */
if (indent)
{
putchar (',');
if (indent + len > columns)
{
putchar ('\n');
putchar (' ');
indent = 1;
}
}
else
putchar (' ');
putchar (' ');
fputs (text, stdout);
return indent + len + 1;
}
/* Output ITEM, of length ITEM_WIDTH, in the left column, followed by
word-wrapped HELP in a second column. */
static void
wrap_help (const char *help, const char *item, unsigned int item_width)
{
unsigned int col_width = 27;
unsigned int remaining, room, len;
remaining = strlen (help);
do
{
room = columns - 3 - MAX (col_width, item_width);
if (room > columns)
room = 0;
len = remaining;
if (room < len)
{
unsigned int i;
for (i = 0; help[i]; i++)
{
if (i >= room && len != remaining)
break;
if (help[i] == ' ')
len = i;
else if ((help[i] == '-' || help[i] == '/')
&& help[i + 1] != ' '
&& i > 0 && ISALPHA (help[i - 1]))
len = i + 1;
}
}
printf( " %-*.*s %.*s\n", col_width, item_width, item, len, help);
item_width = 0;
while (help[len] == ' ')
len++;
help += len;
remaining -= len;
}
while (remaining);
}
/* Return 1 if OPTION is enabled, 0 if it is disabled, or -1 if it isn't
a simple on-off switch. */
@ -1392,6 +1543,7 @@ int
option_enabled (int opt_idx)
{
const struct cl_option *option = &(cl_options[opt_idx]);
if (option->flag_var)
switch (option->var_type)
{

33
gcc/opts.h
View File

@ -1,5 +1,5 @@
/* Command line option handling.
Copyright (C) 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
Copyright (C) 2002, 2003, 2004, 2005, 2007 Free Software Foundation, Inc.
This file is part of GCC.
@ -64,17 +64,30 @@ struct cl_option_state {
extern const struct cl_option cl_options[];
extern const unsigned int cl_options_count;
extern const char *const lang_names[];
extern const unsigned int cl_lang_count;
extern bool no_unit_at_a_time_default;
#define CL_DISABLED (1 << 21) /* Disabled in this configuration. */
#define CL_TARGET (1 << 22) /* Target-specific option. */
#define CL_REPORT (1 << 23) /* Report argument with -fverbose-asm */
#define CL_JOINED (1 << 24) /* If takes joined argument. */
#define CL_SEPARATE (1 << 25) /* If takes a separate argument. */
#define CL_REJECT_NEGATIVE (1 << 26) /* Reject no- form. */
#define CL_MISSING_OK (1 << 27) /* Missing argument OK (joined). */
#define CL_UINTEGER (1 << 28) /* Argument is an integer >=0. */
#define CL_COMMON (1 << 29) /* Language-independent. */
#define CL_PARAMS (1 << 18) /* Fake entry. Used to display --param info with --help. */
#define CL_WARNING (1 << 19) /* Enables an (optional) warning message. */
#define CL_OPTIMIZATION (1 << 20) /* Enables an (optional) optimization. */
#define CL_TARGET (1 << 21) /* Target-specific option. */
#define CL_COMMON (1 << 22) /* Language-independent. */
#define CL_MIN_OPTION_CLASS CL_PARAMS
#define CL_MAX_OPTION_CLASS CL_COMMON
/* From here on the bits describe attributes of the options.
Before this point the bits have described the class of the option.
This distinction is important because --help will not list options
which only have these higher bits set. */
#define CL_DISABLED (1 << 23) /* Disabled in this configuration. */
#define CL_REPORT (1 << 24) /* Report argument with -fverbose-asm */
#define CL_JOINED (1 << 25) /* If takes joined argument. */
#define CL_SEPARATE (1 << 26) /* If takes a separate argument. */
#define CL_REJECT_NEGATIVE (1 << 27) /* Reject no- form. */
#define CL_MISSING_OK (1 << 28) /* Missing argument OK (joined). */
#define CL_UINTEGER (1 << 29) /* Argument is an integer >=0. */
#define CL_UNDOCUMENTED (1 << 30) /* Do not output with --help. */
/* Input file names. */