Common Var(warn_cast_align) Warning
Warn about pointer casts which increase alignment
+Wcpp
+Common Var(warn_cpp) Init(1) Warning
+Warn when a #warning directive is encountered
+
Wdeprecated-declarations
Common Var(warn_deprecated_decl) Init(1) Warning
Warn about uses of __attribute__((deprecated)) declarations
Warn when an inlined function cannot be inlined
Wlarger-than-
-Common RejectNegative Joined UInteger Warning
+Common RejectNegative Joined UInteger Warning Undocumented
Wlarger-than=
Common RejectNegative Joined UInteger Warning
Common Joined UInteger Var(warn_strict_overflow) Init(-1) Warning
Warn about optimizations that assume that signed overflow is undefined
+Wsuggest-attribute=const
+Common Var(warn_suggest_attribute_const) Warning
+Warn about functions which might be candidates for __attribute__((const))
+
+Wsuggest-attribute=pure
+Common Var(warn_suggest_attribute_pure) Warning
+Warn about functions which might be candidates for __attribute__((pure))
+
Wswitch
Common Var(warn_switch) Warning
Warn about enumerated switches, with no default, missing a case
Common Var(warn_unused) Init(0) Warning
Enable all -Wunused- warnings
+Wunused-but-set-parameter
+Common Var(warn_unused_but_set_parameter) Init(-1) Warning
+Warn when a function parameter is only set, otherwise unused
+
+Wunused-but-set-variable
+Common Var(warn_unused_but_set_variable) Init(-1) Warning
+Warn when a variable is only set, otherwise unused
+
Wunused-function
Common Var(warn_unused_function) Init(-1) Warning
Warn when a function is unused
Warn when a variable is unused
Wcoverage-mismatch
-Common RejectNegative Var(warn_coverage_mismatch) Warning
-Warn instead of error in case profiles in -fprofile-use do not match
+Common Var(warn_coverage_mismatch) Init(1) Warning
+Warn in case profiles in -fprofile-use do not match
aux-info
Common Separate
dumpdir
Common Separate
--dumpdir <dir> Set the directory name to be used for dumps
+-dumpdir <dir> Set the directory name to be used for dumps
; The version of the C++ ABI in use. The following values are allowed:
;
;
; 1: The version of the ABI first used in G++ 3.2.
;
-; 2: The version of the ABI first used in G++ 3.4.
+; 2: The version of the ABI first used in G++ 3.4 (and current default).
+;
+; 3: The version of the ABI that fixes the missing underscore
+; in template non-type arguments of pointer type.
+;
+; 4: The version of the ABI that introduces unambiguous mangling of
+; vector types.
;
; Additional positive integers will be assigned as new versions of
; the ABI become the default version of the ABI.
falign-loops=
Common RejectNegative Joined UInteger
-; This flag is only tested if alias checking is enabled.
-; 0 if pointer arguments may alias each other. True in C.
-; 1 if pointer arguments may not alias each other but may alias
-; global variables.
-; 2 if pointer arguments may not alias each other and may not
-; alias global variables.
-; 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) Optimization
-Specify that arguments may alias each other and globals
+Common
+Does nothing. Preserved for backward compatibility.
fargument-noalias
-Common Report Var(flag_argument_noalias,1) VarExists Optimization
-Assume arguments may alias globals but not each other
+Common
+Does nothing. Preserved for backward compatibility.
fargument-noalias-global
-Common Report Var(flag_argument_noalias,2) VarExists Optimization
-Assume arguments alias neither each other nor globals
+Common
+Does nothing. Preserved for backward compatibility.
fargument-noalias-anything
-Common Report Var(flag_argument_noalias,3) VarExists Optimization
-Assume arguments alias no other storage
+Common
+Does nothing. Preserved for backward compatibility.
fasynchronous-unwind-tables
Common Report Var(flag_asynchronous_unwind_tables) Optimization
-fdiagnostics-show-location=[once|every-line] How often to emit source location at the beginning of line-wrapped diagnostics
fdiagnostics-show-option
-Common
+Common Var(flag_diagnostics_show_option) Init(1)
Amend appropriate diagnostic messages with the command line option that controls them
fdump-
Common Report Var(flag_ipa_cp_clone) Optimization
Perform cloning to make Interprocedural constant propagation stronger
-fipa-pure-const
-Common Report Var(flag_ipa_pure_const) Init(0) Optimization
-Discover pure and const functions
+fipa-profile
+Common Report Var(flag_ipa_profile) Init(0) Optimization
+Perform interprocedural profile propagation
fipa-pta
Common Report Var(flag_ipa_pta) Init(0) Optimization
Perform interprocedural points-to analysis
+fipa-pure-const
+Common Report Var(flag_ipa_pure_const) Init(0) Optimization
+Discover pure and const functions
+
fipa-reference
Common Report Var(flag_ipa_reference) Init(0) Optimization
Discover readonly and non addressable static variables
If scheduling post reload, do superblock scheduling
fsched2-use-traces
-Common Report Var(flag_sched2_use_traces) Optimization
-If scheduling post reload, do trace scheduling
+Common
+Does nothing. Preserved for backward compatibility.
fschedule-insns
Common Report Var(flag_schedule_insns) Optimization
Common
Does nothing. Preserved for backward compatibility.
+fzee
+Common Report Var(flag_zee) Init(0)
+Eliminate redundant zero extensions on targets that support implicit extensions.
+
fshow-column
Common C ObjC C++ ObjC++ Report Var(flag_show_column) Init(1)
Show column numbers in diagnostics, when available. Default on
Common JoinedOrMissing Negative(gcoff)
Generate debug information in extended XCOFF format
+iplugindir=
+Common Joined Var(plugindir_string) Init(0)
+-iplugindir=<dir> Set <dir> to be the default plugin directory
+
o
Common Joined Separate
-o <file> Place output into <file>
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