Common Var(flag_fatal_errors)
Exit on the first error occurred
+Wframe-larger-than=
+Common RejectNegative Joined UInteger
+-Wframe-larger-than=<number> Warn if a function's stack frame requires more than <number> bytes
+
Winline
Common Var(warn_inline) Warning
Warn when an inlined function cannot be inlined
Wlarger-than-
Common RejectNegative Joined UInteger Warning
--Wlarger-than-<number> Warn if an object is larger than <number> bytes
+
+Wlarger-than=
+Common RejectNegative Joined UInteger Warning
+-Wlarger-than=<number> Warn if an object is larger than <number> bytes
Wlogical-op
Common Warning Var(warn_logical_op)
Common Var(warn_missing_noreturn) Warning
Warn about functions which might be candidates for __attribute__((noreturn))
+Wmudflap
+Common Var(warn_mudflap) Init(1) Warning
+Warn about constructs not instrumented by -fmudflap
+
Woverflow
Common Var(warn_overflow) Init(1) Warning
Warn about overflow in arithmetic expressions
Warn about code which might break strict aliasing rules
Wstrict-aliasing=
-Common Joined UInteger Warning
+Common Joined UInteger Var(warn_strict_aliasing) Init(-1) Warning
Warn about code which might break strict aliasing rules
Wstrict-overflow
Warn about optimizations that assume that signed overflow is undefined
Wstrict-overflow=
-Common Joined UInteger Warning
+Common Joined UInteger Var(warn_strict_overflow) Init(-1) Warning
Warn about optimizations that assume that signed overflow is undefined
Wswitch
Common Var(warn_system_headers) Warning
Do not suppress warnings from system headers
+Wtype-limits
+Common Var(warn_type_limits) Init(-1) Warning
+Warn if a comparison is always true or always false due to the limited range of the data type
+
Wuninitialized
Common Var(warn_uninitialized) Warning
Warn about uninitialized automatic variables
Common Var(warn_unused_variable) Warning
Warn when a variable is unused
-Wvolatile-register-var
-Common Var(warn_register_var) Warning
-Warn when a register variable is declared volatile
-
Wcoverage-mismatch
Common RejectNegative Var(warn_coverage_mismatch) Warning
Warn instead of error in case profiles in -fprofile-use do not match
Common Report Var(flag_cx_limited_range) Optimization
Omit range reduction step when performing complex division
+fcx-fortran-rules
+Common Report Var(flag_cx_fortran_rules) Optimization
+Complex multiplication and division follow Fortran rules
+
fdata-sections
Common Report Var(flag_data_sections) Optimization
Place data items into their own section
Common Report Var(flag_omit_frame_pointer) Optimization
When possible do not generate stack frames
-fopenmp-ssa
-Common Report Var(flag_openmp_ssa)
-Expand OpenMP operations on SSA form
-
foptimize-register-move
Common Report Var(flag_regmove) Optimization
Do the full register move optimization pass
Common Report Var(profile_arc_flag)
Insert arc-based program profiling code
+fprofile-dir=
+Common Joined RejectNegative
+Set the top-level directory for storing the profile data.
+The default is 'pwd'.
+
fprofile-generate
Common
Enable common options for generating profile info for profile feedback directed optimizations
+fprofile-generate=
+Common Joined RejectNegative
+Enable common options for generating profile info for profile feedback directed optimizations, and set -fprofile-dir=
+
fprofile-use
-Common
+Common Var(flag_profile_use)
Enable common options for performing profile feedback directed optimizations
+fprofile-use=
+Common Joined RejectNegative
+Enable common options for performing profile feedback directed optimizations, and set -fprofile-dir=
+
fprofile-values
Common Report Var(flag_profile_values)
Insert code to profile values of expressions
Common Report Var(flag_tree_fre) Optimization
Enable Full Redundancy Elimination (FRE) on trees
+ftree-loop-distribution
+Common Report Var(flag_tree_loop_distribution) Optimization
+Enable loop distribution on trees
+
ftree-loop-im
Common Report Var(flag_tree_loop_im) Init(1) Optimization
Enable loop invariant motion on trees
Enable reassociation on tree level
ftree-salias
-Common Report Var(flag_tree_salias) Optimization
-Perform structural alias analysis
+Common
+Does nothing. Preserved for backward compatibility.
ftree-sink
Common Report Var(flag_tree_sink) Optimization
Common Report Var(flag_web) Init(2) Optimization
Construct webs and split unrelated uses of single variable
+ftree-builtin-call-dce
+Common Report Var(flag_tree_builtin_call_dce) Init(0) Optimization
+Enable conditional dead code elimination for builtin calls
+
fwhole-program
Common Report Var(flag_whole_program) Init(0) Optimization
Perform whole program optimizations