Common Optimization
Optimize for space rather than speed
+Ofast
+Common Optimization
+Optimize for speed disregarding exact standards compliance
+
W
Common RejectNegative Var(extra_warnings) Warning
This switch is deprecated; use -Wextra instead
Warn about code which might break strict aliasing rules
Wstrict-aliasing=
-Common Joined UInteger Var(warn_strict_aliasing) Init(-1) Warning
+Common Joined RejectNegative 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 Var(warn_strict_overflow) Init(-1) Warning
+Common Joined RejectNegative 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))
+
+Wsuggest-attribute=noreturn
+Common Var(warn_suggest_attribute_noreturn) Warning
+Warn about functions which might be candidates for __attribute__((noreturn))
+
Wswitch
Common Var(warn_switch) Warning
Warn about enumerated switches, with no default, missing a case
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
; Additional positive integers will be assigned as new versions of
; the ABI become the default version of the ABI.
fabi-version=
-Common Joined UInteger Var(flag_abi_version) Init(2)
+Common Joined RejectNegative UInteger Var(flag_abi_version) Init(2)
falign-functions
Common Report Var(align_functions,0) Optimization UInteger
-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_loop_block) Optimization
Enable Loop Blocking transformation
+fstrict-volatile-bitfields
+Common Report Var(flag_strict_volatile_bitfields) Init(-1)
+Force bitfield accesses to match their type width
+
fguess-branch-probability
Common Report Var(flag_guess_branch_prob) Optimization
Enable guessing of branch probabilities
Common Report Var(flag_if_conversion2) Optimization
Perform conversion of conditional jumps to conditional execution
+ftree-loop-if-convert
+Common Report Var(flag_tree_loop_if_convert) Init(-1) Optimization
+Convert conditional jumps in innermost loops to branchless equivalents
+
; -finhibit-size-directive inhibits output of .size for ELF.
; This is used only for compiling crtstuff.c,
; and it may be extended to other effects
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
-fipa-type-escape
-Common Report Var(flag_ipa_type_escape) Init(0) Optimization
-Type based escape and alias analysis
-
fipa-matrix-reorg
Common Report Var(flag_ipa_matrix_reorg) Optimization
Perform matrix layout flattening and transposing based
Share stack slots for spilled pseudo-registers.
fira-verbose=
-Common RejectNegative Joined UInteger
+Common RejectNegative Joined UInteger Var(flag_ira_verbose) Init(5)
-fira-verbose=<number> Control IRA's level of diagnostic messages.
fivopts
; The initial value of -1 comes from Z_DEFAULT_COMPRESSION in zlib.h.
flto-compression-level=
-Common Joined UInteger Var(flag_lto_compression_level) Init(-1)
+Common Joined RejectNegative UInteger Var(flag_lto_compression_level) Init(-1)
-flto-compression-level=<number> Use zlib compression level <number> for IL
flto-report
Common Report Var(flag_optimize_sibling_calls) Optimization
Optimize sibling and tail recursive calls
+fpartial-inlining
+Common Report Var(flag_partial_inlining)
+Perform partial inlining
+
fpre-ipa-mem-report
Common Report Var(pre_ipa_mem_report)
Report on memory allocation before interprocedural optimization
-fpack-struct=<number> Set initial maximum structure member alignment
fpcc-struct-return
-Common Report Var(flag_pcc_struct_return,1) VarExists
+Common Report Var(flag_pcc_struct_return,1) Init(DEFAULT_PCC_STRUCT_RETURN)
Return small aggregates in memory, not registers
fpeel-loops
Run predictive commoning optimization.
fprefetch-loop-arrays
-Common Report Var(flag_prefetch_loop_arrays) Optimization
+Common Report Var(flag_prefetch_loop_arrays) Init(-1) Optimization
Generate prefetch instructions, if available, for arrays in loops
fprofile
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)
+Common Report Var(flag_show_column) Init(1)
Show column numbers in diagnostics, when available. Default on
fsignaling-nans
Enable loop optimizations on tree level
ftree-parallelize-loops=
-Common Report Joined UInteger Var(flag_tree_parallelize_loops) Init(1)
+Common Report Joined RejectNegative UInteger Var(flag_tree_parallelize_loops) Init(1)
Enable automatic parallelization of loops
ftree-phiprop
Construct webs and split unrelated uses of single variable
fwhopr
-Common Var(flag_whopr)
-Enable partitioned link-time optimization.
+Common
+Enable partitioned link-time optimization
+
+fwhopr=
+Common RejectNegative UInteger Joined Var(flag_whopr)
+Enable partitioned link-time optimization with specified number of parallel jobs
ftree-builtin-call-dce
Common Report Var(flag_tree_builtin_call_dce) Init(0) Optimization
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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