; Options for the language- and target-independent parts of the compiler.
-; Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009
+; Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
; Free Software Foundation, Inc.
;
; This file is part of GCC.
; Please try to keep this file in ASCII collating order.
+Variable
+int target_flags
+
+Variable
+int optimize
+
+Variable
+int optimize_size
+
+; 0 means straightforward implementation of complex divide acceptable.
+; 1 means wide ranges of inputs must work for complex divide.
+; 2 means C99-like requirements for complex multiply and divide.
+Variable
+int flag_complex_method = 1
+
+; Nonzero if subexpressions must be evaluated from left-to-right.
+Variable
+int flag_evaluation_order = 0
+
+; Set the default region and algorithm for the integrated register
+; allocator.
+
+Variable
+enum ira_algorithm flag_ira_algorithm = IRA_ALGORITHM_CB
+
+Variable
+enum ira_region flag_ira_region = IRA_REGION_MIXED
+
+; Language specific warning pass for unused results.
+Variable
+bool flag_warn_unused_result = false
+
+Variable
+int *param_values
+
+; Floating-point contraction mode, fast by default.
+Variable
+enum fp_contract_mode flag_fp_contract_mode = FP_CONTRACT_FAST
+
+; The excess precision specified on the command line, or defaulted by
+; the front end.
+Variable
+enum excess_precision flag_excess_precision_cmdline = EXCESS_PRECISION_DEFAULT
+
+; Nonzero if we should write GIMPLE bytecode for link-time optimization.
+Variable
+int flag_generate_lto
+
+; True to warn about any objects definitions whose size is larger
+; than N bytes. Also want about function definitions whose returned
+; values are larger than N bytes, where N is 'larger_than_size'.
+Variable
+bool warn_larger_than
+
+Variable
+HOST_WIDE_INT larger_than_size
+
+; True to warn about any function whose frame size is larger
+; than N bytes.
+Variable
+bool warn_frame_larger_than
+
+Variable
+HOST_WIDE_INT frame_larger_than_size
+
+; Nonzero means we should be saving declaration info into a .X file.
+Variable
+int flag_gen_aux_info = 0
+
+; Nonzero if we are compiling code for a shared library, zero for
+; executable.
+Variable
+int flag_shlib
+
+; The default visibility for all symbols (unless overridden).
+Variable
+enum symbol_visibility default_visibility = VISIBILITY_DEFAULT
+
+; Set to the default thread-local storage (tls) model to use.
+Variable
+enum tls_model flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC
+
+; These two are really VEC(char_p,heap) *.
+
+Variable
+void *flag_instrument_functions_exclude_functions
+
+Variable
+void *flag_instrument_functions_exclude_files
+
+; Generic structs (e.g. templates not explicitly specialized)
+; may not have a compilation unit associated with them, and so
+; may need to be treated differently from ordinary structs.
+;
+; Structs only handled by reference (indirectly), will also usually
+; not need as much debugging information.
+
+Variable
+enum debug_struct_file debug_struct_ordinary[DINFO_USAGE_NUM_ENUMS] = { DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY }
+
+Variable
+enum debug_struct_file debug_struct_generic[DINFO_USAGE_NUM_ENUMS] = { DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY }
+
+; True if we should exit after parsing options.
+Variable
+bool exit_after_options
+
+; Type(s) of debugging information we are producing (if any). See
+; flag-types.h for the definitions of the different possible types of
+; debugging information.
+Variable
+enum debug_info_type write_symbols = NO_DEBUG
+
+; Level of debugging information we are producing. See flag-types.h
+; for the definitions of the different possible levels.
+Variable
+enum debug_info_levels debug_info_level = DINFO_LEVEL_NONE
+
+; Nonzero means use GNU-only extensions in the generated symbolic
+; debugging information. Currently, this only has an effect when
+; write_symbols is set to DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG.
+Variable
+bool use_gnu_debug_info_extensions
+
+; Original value of maximum field alignment in bytes, specified via
+; -fpack-struct=<value>.
+Variable
+unsigned int initial_max_fld_align = TARGET_DEFAULT_PACK_STRUCT
+
+Variable
+enum vect_verbosity_levels user_vect_verbosity_level = MAX_VERBOSITY_LEVEL
+
+; -dA causes debug commentary information to be produced in
+; the generated assembly code (to make it more readable). This option
+; is generally only of use to those who actually need to read the
+; generated assembly code (perhaps while debugging the compiler itself).
+; Currently, this switch is only used by dwarf2out.c; however, it is intended
+; to be a catchall for printing debug information in the assembler file.
+Variable
+int flag_debug_asm
+
+; -dP causes the rtl to be emitted as a comment in assembly.
+Variable
+int flag_dump_rtl_in_asm
+
+; Whether -da was passed (used only in handle_common_deferred_options).
+Variable
+bool flag_dump_all_passed
+
+; Other flags saying which kinds of debugging dump have been requested.
+
+Variable
+int rtl_dump_and_exit
+
+Variable
+int flag_print_asm_name
+
+Variable
+enum graph_dump_types graph_dump_format = no_graph
+
+; Which options have been printed by --help.
+Variable
+char *help_printed
+
+; The number of columns for --help output.
+Variable
+unsigned int help_columns
+
+; Whether this options structure has been through finish_options
+Variable
+bool flag_opts_finished
+
+###
+Driver
+
+-assemble
+Driver Alias(S)
+
+-compile
+Driver Alias(c)
+
+-coverage
+Driver Alias(coverage)
+
+-debug
+Common Alias(g)
+
+-dump
+Common Separate Alias(d)
+
+-dump=
+Common Joined Alias(d)
+
+-dumpbase
+Common Separate Alias(dumpbase)
+
+-dumpdir
+Common Separate Alias(dumpdir)
+
+-entry
+Driver Separate Alias(e)
+
+-entry=
+Driver Joined Alias(e)
+
+-extra-warnings
+Common Warning Alias(Wextra)
+
+-for-assembler
+Driver Separate Alias(Xassembler)
+
+-for-assembler=
+Driver JoinedOrMissing Alias(Xassembler)
+
+-for-linker
+Driver Separate Alias(Xlinker)
+
+-for-linker=
+Driver JoinedOrMissing Alias(Xlinker)
+
+-force-link
+Driver Separate Alias(u)
+
+-force-link=
+Driver Joined Alias(u)
+
-help
-Common
+Common Driver Var(help_flag)
Display this information
-help=
-Common Report Joined
+Common Driver Report Joined
--help=<class> Display descriptions of a specific class of options. <class> is one or more of optimizers, target, warnings, undocumented, params
+-language
+Driver Separate Alias(x)
+
+-language=
+Driver Joined Alias(x)
+
+-library-directory
+Driver Separate Alias(L)
+
+-library-directory=
+Driver Joined Alias(L)
+
+-no-canonical-prefixes
+Driver Alias(no-canonical-prefixes)
+
+-no-standard-libraries
+Driver Alias(nostdlib)
+
+-no-warnings
+Common Alias(w)
+
+-optimize
+Common Alias(O)
+
+-output
+Common Driver Separate Alias(o) MissingArgError(missing filename after %qs)
+
+-output=
+Common Driver Joined Alias(o) MissingArgError(missing filename after %qs)
+
+-pass-exit-codes
+Driver Alias(pass-exit-codes)
+
+-pedantic
+Common Alias(pedantic)
+
+-pedantic-errors
+Common Alias(pedantic-errors)
+
+-pie
+Common Alias(pie)
+
+-pipe
+Driver Alias(pipe)
+
+-prefix
+Driver Separate Alias(B)
+
+-prefix=
+Driver JoinedOrMissing Alias(B)
+
+-preprocess
+Driver Alias(E)
+
+-print-file-name
+Driver Separate Alias(print-file-name=)
+
+-print-file-name=
+Driver JoinedOrMissing Alias(print-file-name=)
+
+-print-libgcc-file-name
+Driver Alias(print-libgcc-file-name)
+
+-print-multi-directory
+Driver Alias(print-multi-directory)
+
+-print-multi-lib
+Driver Alias(print-multi-lib)
+
+-print-multi-os-directory
+Driver Alias(print-multi-os-directory)
+
+-print-prog-name
+Driver Separate Alias(print-prog-name=)
+
+-print-prog-name=
+Driver JoinedOrMissing Alias(print-prog-name=)
+
+-print-search-dirs
+Driver Alias(print-search-dirs)
+
+-print-sysroot
+Driver Alias(print-sysroot)
+
+-print-sysroot-headers-suffix
+Driver Alias(print-sysroot-headers-suffix)
+
+-profile
+Common Alias(p)
+
+-save-temps
+Driver Alias(save-temps)
+
+-shared
+Common Alias(shared)
+
+-specs
+Driver Separate Alias(specs=)
+
+-specs=
+Driver Joined Alias(specs=)
+
+-static
+Driver Alias(static)
+
+-symbolic
+Driver Alias(symbolic)
+
-target-help
-Common
+Common Driver
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).
+-time
+Driver Alias(time)
+
+-verbose
+Driver Alias(v)
+
+;; The driver used to convert options such as --help into forms such
+;; as -fhelp; the following four entries are for compatibility with
+;; any direct uses of those (undocumented) -f forms
fhelp
-Common
+Common Driver Alias(-help)
fhelp=
-Common Joined
+Common Driver Joined Alias(-help=)
ftarget-help
-Common
+Common Driver Alias(-target-help)
+
+fversion
+Common Driver Alias(-version)
-param
Common Separate
--param <param>=<value> Set parameter <param> to value. See below for a complete list of parameters
+-param=
+Common Joined Alias(-param)
+
+-sysroot
+Driver Separate Alias(-sysroot=)
+
+-sysroot=
+Driver JoinedOrMissing
+
-version
-Common
+Common Driver
+
+B
+Driver Joined Separate
+
+E
+Driver
-G
-Common Joined Separate UInteger
--G<number> Put global and static data smaller than <number> bytes into a special section (on some targets)
+L
+Driver Joined Separate
O
Common JoinedOrMissing Optimization
Common Optimization
Optimize for space rather than speed
+Ofast
+Common Optimization
+Optimize for speed disregarding exact standards compliance
+
+R
+Driver Joined Separate
+
+S
+Driver
+
+T
+Driver Joined Separate
+
+Tbss
+Driver Separate
+
+Tdata
+Driver Separate
+
+Ttext
+Driver Separate
+
W
-Common RejectNegative
+Common RejectNegative Warning Alias(Wextra)
This switch is deprecated; use -Wextra instead
+Wa,
+Driver JoinedOrMissing
+
+Wl,
+Driver JoinedOrMissing
+
+Wp,
+Driver JoinedOrMissing
+
Waggregate-return
Common Var(warn_aggregate_return) Warning
Warn about returning structures, unions or arrays
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
Treat specified warning as error
Wextra
-Common Warning
+Common Var(extra_warnings) Warning
Print extra (possibly unwanted) warnings
Wfatal-errors
Wframe-larger-than=
Common RejectNegative Joined UInteger
--Wframe-larger-than=<number> Warn if a function's stack frame requires more than <number> bytes
+-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
+Common RejectNegative Joined Warning Undocumented Alias(Wlarger-than=)
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)
-Warn when a logical operator is suspicously always evaluating to true or false
-
Wunsafe-loop-optimizations
Common Var(warn_unsafe_loop_optimizations) Warning
Warn if the loop cannot be optimized due to nontrivial assumptions.
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
Common Var(warn_system_headers) Warning
Do not suppress warnings from system headers
+Wtrampolines
+Common Var(warn_trampolines) Warning
+Warn whenever a trampoline is generated
+
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
+Common Var(warn_uninitialized) Init(-1) Warning
Warn about uninitialized automatic variables
Wunreachable-code
-Common Var(warn_notreached) Warning
-Warn about code that will never be executed
+Common Ignore
+Does nothing. Preserved for backward compatibility.
Wunused
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
+
+Xassembler
+Driver Separate
+
+Xlinker
+Driver Separate
+
+Xpreprocessor
+Driver Separate
aux-info
-Common Separate
+Common Separate Var(aux_info_file_name)
-aux-info <file> Emit declaration information into <file>
aux-info=
-Common Joined
+Common Joined Alias(aux-info)
auxbase
-Common Separate
+Common Separate RejectDriver Var(aux_base_name)
auxbase-strip
-Common Separate
+Common Separate RejectDriver
+
+coverage
+Driver
+
+c
+Driver
d
Common Joined
-d<letters> Enable dumps from specific passes of the compiler
dumpbase
-Common Separate
+Common Separate Var(dump_base_name)
-dumpbase <file> Set the file basename to be used for dumps
+dumpdir
+Common Separate Var(dump_dir_name)
+-dumpdir <dir> Set the directory name to be used for dumps
+
+dumpmachine
+Driver
+
+dumpspecs
+Driver
+
+dumpversion
+Driver
+
+e
+Driver Joined Separate
+
; The version of the C++ ABI in use. The following values are allowed:
;
; 0: The version of the ABI believed most conformant with the C++ ABI
;
; 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.
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
Align the start of functions
falign-functions=
-Common RejectNegative Joined UInteger
+Common RejectNegative Joined UInteger Var(align_functions)
falign-jumps
Common Report Var(align_jumps,0) Optimization UInteger
Align labels which are only reached by jumping
falign-jumps=
-Common RejectNegative Joined UInteger
+Common RejectNegative Joined UInteger Var(align_jumps)
falign-labels
Common Report Var(align_labels,0) Optimization UInteger
Align all labels
falign-labels=
-Common RejectNegative Joined UInteger
+Common RejectNegative Joined UInteger Var(align_labels)
falign-loops
-Common Report Var(align_loops) Optimization UInteger
+Common Report Var(align_loops,0) Optimization UInteger
Align the start of loops
falign-loops=
-Common RejectNegative Joined UInteger
+Common RejectNegative Joined UInteger Var(align_loops)
-; 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 Ignore
+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 Ignore
+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 Ignore
+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 Ignore
+Does nothing. Preserved for backward compatibility.
fasynchronous-unwind-tables
Common Report Var(flag_asynchronous_unwind_tables) Optimization
Restrict target load migration not to re-use registers in any basic block
fcall-saved-
-Common Joined RejectNegative
+Common Joined RejectNegative Var(common_deferred_options) Defer
-fcall-saved-<register> Mark <register> as being preserved across functions
fcall-used-
-Common Joined RejectNegative
+Common Joined RejectNegative Var(common_deferred_options) Defer
-fcall-used-<register> Mark <register> as being corrupted by function calls
; Nonzero for -fcaller-saves: allocate values in regs that need to
Common Report Var(flag_check_data_deps)
Compare the results of several data dependence analyzers.
+fcombine-stack-adjustments
+Common Report Var(flag_combine_stack_adjustments) Optimization
+Looks for opportunities to reduce stack adjustments and stack references.
+
fcommon
Common Report Var(flag_no_common,0) Optimization
Do not put uninitialized globals in the common section
+fcompare-debug
+Driver
+; Converted by the driver to -fcompare-debug= options.
+
+fcompare-debug=
+Common Driver JoinedOrMissing RejectNegative Var(flag_compare_debug_opt)
+-fcompare-debug[=<opts>] Compile with and without e.g. -gtoggle, and compare the final-insns dump
+
+fcompare-debug-second
+Common Driver RejectNegative
+Run only the second compilation of -fcompare-debug
+
fconserve-stack
Common Var(flag_conserve_stack) Optimization
Do not perform optimizations increasing noticeably stack usage
When running CSE, follow jumps to their targets
fcse-skip-blocks
-Common Report Var(flag_cse_skip_blocks) Optimization
-When running CSE, follow conditional jumps
+Common Ignore
+Does nothing. Preserved for backward compatibility.
fcx-limited-range
Common Report Var(flag_cx_limited_range) Optimization
Place data items into their own section
fdbg-cnt-list
-Common Report
+Common Report Var(common_deferred_options) Defer
List all available debugging counters with their limits and counts.
fdbg-cnt=
-Common RejectNegative Joined
--fdbg-cnt=<counter>:<limit>[,<counter>:<limit>,...] Set the debug counter limit.
+Common RejectNegative Joined Var(common_deferred_options) Defer
+-fdbg-cnt=<counter>:<limit>[,<counter>:<limit>,...] Set the debug counter limit.
fdebug-prefix-map=
-Common Joined RejectNegative
+Common Joined RejectNegative Var(common_deferred_options) Defer
Map one directory name to another in debug information
; Nonzero for -fdefer-pop: don't pop args after each function call
Attempt to fill delay slots of branch instructions
fdelete-null-pointer-checks
-Common Report Var(flag_delete_null_pointer_checks) Optimization
+Common Report Var(flag_delete_null_pointer_checks) Init(1) Optimization
Delete useless null pointer checks
fdiagnostics-show-location=
-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 Joined RejectNegative
+Common Joined RejectNegative Var(common_deferred_options) Defer
-fdump-<type> Dump various compiler internals to a file
+fdump-final-insns
+Driver RejectNegative
+
+fdump-final-insns=
+Common RejectNegative Joined Var(flag_dump_final_insns)
+-fdump-final-insns=filename Dump to filename the insns at the end of translation
+
+fdump-go-spec=
+Common RejectNegative Joined Var(flag_dump_go_spec)
+-fdump-go-spec=filename Write all declarations to file as Go code
+
fdump-noaddr
Common Report Var(flag_dump_noaddr)
Suppress output of addresses in debugging dumps
fdump-unnumbered
-Common Report Var(flag_dump_unnumbered) VarExists
+Common Report Var(flag_dump_unnumbered)
Suppress output of instruction numbers, line number notes and addresses in debugging dumps
+fdump-unnumbered-links
+Common Report Var(flag_dump_unnumbered_links)
+Suppress output of previous and next insn numbers in debugging dumps
+
fdwarf2-cfi-asm
Common Report Var(flag_dwarf2_cfi_asm) Init(HAVE_GAS_CFI_DIRECTIVE)
Enable CFI tables via GAS assembler directives.
Common Report Var(flag_eliminate_dwarf2_dups)
Perform DWARF2 duplicate elimination
+fipa-sra
+Common Report Var(flag_ipa_sra) Init(0) Optimization
+Perform interprocedural reduction of aggregates
+
feliminate-unused-debug-symbols
Common Report Var(flag_debug_only_used_symbols)
Perform unused type elimination in debug info
Common Report Var(flag_emit_class_debug_always) Init(0)
Do not suppress C++ class debug information.
+fenable-icf-debug
+Common Report Var(flag_enable_icf_debug)
+Generate debug information to support Identical Code Folding (ICF)
+
fexceptions
Common Report Var(flag_exceptions) Optimization
Enable exception handling
Common Report Var(flag_expensive_optimizations) Optimization
Perform a number of minor, expensive optimizations
+fexcess-precision=
+Common Joined RejectNegative
+-fexcess-precision=[fast|standard] Specify handling of excess floating-point precision
+
ffast-math
Common
Assume no NaNs or infinities are generated
ffixed-
-Common Joined RejectNegative
+Common Joined RejectNegative Var(common_deferred_options) Defer
-ffixed-<register> Mark <register> as being unavailable to the compiler
ffloat-store
Don't allocate floats and doubles in extended-precision registers
fforce-addr
-Common
+Common Ignore
Does nothing. Preserved for backward compatibility.
fforward-propagate
Common Report Var(flag_forward_propagate) Optimization
Perform a forward propagation pass on RTL
+ffp-contract=
+Common Joined RejectNegative
+-ffp-contract=[off|on|fast] Perform floating-point expression contraction.
+
; Nonzero means don't put addresses of constant functions in registers.
; Used for compiling the Unix kernel, where strange substitutions are
; done on the assembly output.
Common Report Var(flag_graphite)
Enable in and out of Graphite representation
+fgraphite-identity
+Common Report Var(flag_graphite_identity) Optimization
+Enable Graphite Identity transformation
+
+floop-parallelize-all
+Common Report Var(flag_loop_parallelize_all) Optimization
+Mark all loops as parallel
+
floop-strip-mine
Common Report Var(flag_loop_strip_mine) Optimization
Enable Loop Strip Mining transformation
Common Report Var(flag_loop_block) Optimization
Enable Loop Blocking transformation
-; This option is not documented as it does not perform any useful optimization.
-fgraphite-identity
-Common Report Var(flag_graphite_identity) Optimization
-Enable Graphite Identity transformation
+floop-flatten
+Common Report Var(flag_loop_flatten) Optimization
+Enable Loop Flattening 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
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
+
+ftree-loop-if-convert-stores
+Common Report Var(flag_tree_loop_if_convert_stores) Optimization
+Also if-convert conditional jumps containing memory writes
+
; -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
Integrate functions called once into their callers
finline-limit-
-Common RejectNegative Joined UInteger
+Common RejectNegative Joined Alias(finline-limit=)
finline-limit=
Common RejectNegative Joined UInteger
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
Common Joined RejectNegative
-fira-region=[one|all|mixed] Set regions for IRA
-fira-coalesce
-Common Report Var(flag_ira_coalesce) Init(0)
-Do optimistic coalescing.
+fira-loop-pressure
+Common Report Var(flag_ira_loop_pressure)
+Use IRA based register pressure calculation
+in RTL loop optimizations.
fira-share-save-slots
Common Report Var(flag_ira_share_save_slots) Init(1)
Share stack slots for spilled pseudo-registers.
fira-verbose=
-Common RejectNegative Joined UInteger
--fira-verbose=<number> Control IRA's level of diagnostic messages.
+Common RejectNegative Joined UInteger Var(flag_ira_verbose) Init(5)
+-fira-verbose=<number> Control IRA's level of diagnostic messages.
fivopts
Common Report Var(flag_ivopts) Init(1) Optimization
Give external symbols a leading underscore
floop-optimize
-Common
+Common Ignore
Does nothing. Preserved for backward compatibility.
+flto
+Common
+Enable link-time optimization.
+
+flto=
+Common RejectNegative Joined Var(flag_lto)
+Link-time optimization with number of parallel jobs or jobserver.
+
+flto-partition=1to1
+Common Var(flag_lto_partition_1to1)
+Partition functions and vars at linktime based on object files they originate from
+
+flto-partition=balanced
+Common Var(flag_lto_partition_balanced)
+Partition functions and vars at linktime into approximately same sized buckets
+
+flto-partition=none
+Common Var(flag_lto_partition_none)
+Disable partioning and streaming
+
+; The initial value of -1 comes from Z_DEFAULT_COMPRESSION in zlib.h.
+flto-compression-level=
+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_lto_report) Init(0) Optimization
+Report various link-time optimization statistics
+
fmath-errno
Common Report Var(flag_errno_math) Init(1) Optimization
Set errno after built-in math functions
+fmax-errors=
+Common Joined RejectNegative UInteger Var(flag_max_errors)
+-fmax-errors=<number> Maximum number of errors to report
+
fmem-report
Common Report Var(mem_report)
Report on permanent memory allocation
Attempt to merge identical constants and constant variables
fmerge-constants
-Common Report Var(flag_merge_constants,1) VarExists Optimization
+Common Report Var(flag_merge_constants,1) Optimization
Attempt to merge identical constants across compilation units
fmerge-debug-strings
Add mudflap bounds-checking instrumentation for single-threaded program
fmudflapth
-Common RejectNegative Report VarExists Var(flag_mudflap,2)
+Common RejectNegative Report Var(flag_mudflap,2)
Add mudflap bounds-checking instrumentation for multi-threaded program
fmudflapir
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
Generate position-independent code for executables if possible (large mode)
fpic
-Common Report Var(flag_pic,1) VarExists
+Common Report Var(flag_pic,1)
Generate position-independent code if possible (small mode)
fpie
-Common Report Var(flag_pie,1) VarExists
+Common Report Var(flag_pie,1)
Generate position-independent code for executables if possible (small mode)
+fplugin=
+Common Joined RejectNegative Var(common_deferred_options) Defer
+Specify a plugin to load
+
+fplugin-arg-
+Common Joined RejectNegative Var(common_deferred_options) Defer
+-fplugin-arg-<name>-<key>[=<value>] Specify argument <key>=<value> for plugin <name>
+
fpredictive-commoning
Common Report Var(flag_predictive_commoning) Optimization
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
Insert arc-based program profiling code
fprofile-dir=
-Common Joined RejectNegative
+Common Joined RejectNegative Var(profile_data_prefix)
Set the top-level directory for storing the profile data.
The default is 'pwd'.
Insert code to profile values of expressions
frandom-seed
-Common
+Common Var(common_deferred_options) Defer
frandom-seed=
-Common Joined RejectNegative
+Common Joined RejectNegative Var(common_deferred_options) Defer
-frandom-seed=<string> Make compile reproducible using <string>
; This switch causes the command line that was used to create an
Record gcc command line switches in the object file.
freg-struct-return
-Common Report Var(flag_pcc_struct_return,0) VarExists Optimization
+Common Report Var(flag_pcc_struct_return,0) Optimization
Return small aggregates in registers
fregmove
Reorder functions to improve code placement
frerun-cse-after-loop
-Common Report Var(flag_rerun_cse_after_loop) Init(2) Optimization
+Common Report Var(flag_rerun_cse_after_loop) Optimization
Add a common subexpression elimination pass after loop optimizations
frerun-loop-opt
-Common
+Common Ignore
Does nothing. Preserved for backward compatibility.
frounding-math
Common Report Var(flag_schedule_interblock) Init(1) Optimization
Enable scheduling across basic blocks
+fsched-pressure
+Common Report Var(flag_sched_pressure) Init(0) Optimization
+Enable register pressure sensitive insn scheduling
+
fsched-spec
Common Report Var(flag_schedule_speculative) Init(1) Optimization
Allow speculative motion of non-loads
Allow speculative motion of more loads
fsched-verbose=
-Common RejectNegative Joined
+Common RejectNegative Joined UInteger Var(sched_verbose_param)
-fsched-verbose=<number> Set the verbosity level of the scheduler
fsched2-use-superblocks
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 Ignore
+Does nothing. Preserved for backward compatibility.
fschedule-insns
Common Report Var(flag_schedule_insns) Optimization
Common RejectNegative Joined UInteger
-fsched-stalled-insns-dep=<number> Set dependence distance checking in premature scheduling of queued insns
+fsched-group-heuristic
+Common Report Var(flag_sched_group_heuristic) Init(1) Optimization
+Enable the group heuristic in the scheduler
+
+fsched-critical-path-heuristic
+Common Report Var(flag_sched_critical_path_heuristic) Init(1) Optimization
+Enable the critical path heuristic in the scheduler
+
+fsched-spec-insn-heuristic
+Common Report Var(flag_sched_spec_insn_heuristic) Init(1) Optimization
+Enable the speculative instruction heuristic in the scheduler
+
+fsched-rank-heuristic
+Common Report Var(flag_sched_rank_heuristic) Init(1) Optimization
+Enable the rank heuristic in the scheduler
+
+fsched-last-insn-heuristic
+Common Report Var(flag_sched_last_insn_heuristic) Init(1) Optimization
+Enable the last instruction heuristic in the scheduler
+
+fsched-dep-count-heuristic
+Common Report Var(flag_sched_dep_count_heuristic) Init(1) Optimization
+Enable the dependent count heuristic in the scheduler
+
fsection-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) Optimization
-Perform sequence abstraction optimization on RTL
-
fsee
-Common Report Var(flag_see) Init(0)
-Eliminate redundant sign extensions using LCM.
+Common Ignore
+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(0)
-Show column numbers in diagnostics, when available. Default off
+Common Report Var(flag_show_column) Init(1)
+Show column numbers in diagnostics, when available. Default on
fsignaling-nans
Common Report Var(flag_signaling_nans) Optimization
Common Report Var(flag_split_ivs_in_unroller) Init(1) Optimization
Split lifetimes of induction variables when loops are unrolled
+fsplit-stack
+Common Report Var(flag_split_stack) Init(-1)
+Generate discontiguous stack frames
+
fsplit-wide-types
Common Report Var(flag_split_wide_types) Optimization
Split wide types into independent registers
-fstack-check=[no|generic|specific] Insert stack checking code into the program
fstack-check
-Common Report
+Common Alias(fstack-check=, specific, no)
Insert stack checking code into the program. Same as -fstack-check=specific
fstack-limit
-Common
+Common Var(common_deferred_options) Defer
fstack-limit-register=
-Common RejectNegative Joined
+Common RejectNegative Joined Var(common_deferred_options) Defer
-fstack-limit-register=<register> Trap if the stack goes past <register>
fstack-limit-symbol=
-Common RejectNegative Joined
+Common RejectNegative Joined Var(common_deferred_options) Defer
-fstack-limit-symbol=<name> Trap if the stack goes past symbol <name>
fstack-protector
Use propolice as a stack protection method
fstack-protector-all
-Common Report RejectNegative Var(flag_stack_protect, 2) VarExists
+Common Report RejectNegative Var(flag_stack_protect, 2)
Use a stack protection method for every function
+fstack-usage
+Common RejectNegative Var(flag_stack_usage)
+Output stack usage information on a per-function basis
+
fstrength-reduce
-Common
+Common Ignore
Does nothing. Preserved for backward compatibility.
; Nonzero if we should do (language-dependent) alias analysis.
Common Report Var(flag_tree_ccp) Optimization
Enable SSA-CCP optimization on trees
+ftree-bit-ccp
+Common Report Var(flag_tree_bit_ccp) Optimization
+Enable SSA-BIT-CCP optimization on trees
+
ftree-store-ccp
-Common
+Common Ignore
Does nothing. Preserved for backward compatibility.
ftree-ch
Enable copy propagation on trees
ftree-store-copy-prop
-Common
+Common Ignore
Does nothing. Preserved for backward compatibility.
ftree-cselim
Common Report Var(flag_tree_dse) Optimization
Enable dead store elimination
+ftree-forwprop
+Common Report Var(flag_tree_forwprop) Init(1) Optimization
+Enable forward propagation on trees
+
ftree-fre
Common Report Var(flag_tree_fre) Optimization
Enable Full Redundancy Elimination (FRE) on trees
Common Report Var(flag_tree_loop_distribution) Optimization
Enable loop distribution on trees
+ftree-loop-distribute-patterns
+Common Report Var(flag_tree_loop_distribute_patterns) Optimization
+Enable loop distribution for patterns transformed into a library call
+
ftree-loop-im
Common Report Var(flag_tree_loop_im) Init(1) Optimization
Enable loop invariant motion on trees
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
+Common Report Var(flag_tree_phiprop) Init(1) Optimization
+Enable hoisting loads from conditional pointers.
+
ftree-pre
Common Report Var(flag_tree_pre) Optimization
Enable SSA-PRE optimization on trees
+ftree-pta
+Common Report Var(flag_tree_pta) Init(1) Optimization
+Perform function-local points-to analysis on trees.
+
ftree-reassoc
Common Report Var(flag_tree_reassoc) Init(1) Optimization
Enable reassociation on tree level
ftree-salias
-Common
+Common Ignore
Does nothing. Preserved for backward compatibility.
ftree-sink
Perform scalar replacement of aggregates
ftree-ter
-Common Report Var(flag_tree_ter) Init(1) Optimization
+Common Report Var(flag_tree_ter) Optimization
Replace temporary expressions in the SSA->normal pass
ftree-lrs
Common Report Var(flag_unwind_tables) Optimization
Just generate unwind tables for exception handling
+fuse-linker-plugin
+Common Undocumented
+
+; Positive if we should track variables, negative if we should run
+; the var-tracking pass only to discard debug annotations, zero if
+; we're not to run it. When flag_var_tracking == 2 (AUTODETECT_VALUE) it
+; will be set according to optimize, debug_info_level and debug_hooks
+; in process_options ().
fvar-tracking
-Common Report Var(flag_var_tracking) VarExists Optimization
+Common Report Var(flag_var_tracking) Init(2) Optimization
Perform variable tracking
+; Positive if we should track variables at assignments, negative if
+; we should run the var-tracking pass only to discard debug
+; annotations. When flag_var_tracking_assignments ==
+; AUTODETECT_VALUE it will be set according to flag_var_tracking.
+fvar-tracking-assignments
+Common Report Var(flag_var_tracking_assignments) Init(2) Optimization
+Perform variable tracking by annotating assignments
+
+; Nonzero if we should toggle flag_var_tracking_assignments after
+; processing options and computing its default. */
+fvar-tracking-assignments-toggle
+Common Report Var(flag_var_tracking_assignments_toggle) Optimization
+Toggle -fvar-tracking-assignments
+
fvar-tracking-uninit
Common Report Var(flag_var_tracking_uninit) Optimization
Perform variable tracking and also tag variables that are uninitialized
Common Report Var(flag_tree_vectorize) Optimization
Enable loop vectorization on trees
+ftree-slp-vectorize
+Common Report Var(flag_tree_slp_vectorize) Init(2) Optimization
+Enable basic block vectorization (SLP) on trees
+
fvect-cost-model
Common Report Var(flag_vect_cost_model) Optimization
Enable use of cost model in vectorization
Enable loop versioning when doing loop vectorization on trees
ftree-vectorizer-verbose=
-Common RejectNegative Joined
+Common RejectNegative Joined UInteger
-ftree-vectorizer-verbose=<number> Set the verbosity level of the vectorizer
ftree-scev-cprop
Generate debug information in default format
gcoff
-Common JoinedOrMissing Negative(gdwarf-2)
+Common JoinedOrMissing Negative(gdwarf-)
Generate debug information in COFF format
-gdwarf-2
-Common JoinedOrMissing Negative(gstabs)
-Generate debug information in DWARF v2 format
+gdwarf-
+Common Joined UInteger Var(dwarf_version) Init(2) Negative(gstabs)
+Generate debug information in DWARF v2 (or later) format
ggdb
Common JoinedOrMissing
Common JoinedOrMissing Negative(gvms)
Generate debug information in extended STABS format
+gno-strict-dwarf
+Common RejectNegative Var(dwarf_strict,0) Init(-1)
+Emit DWARF additions beyond selected version
+
+gstrict-dwarf
+Common Report RejectNegative Var(dwarf_strict,1)
+Don't emit DWARF additions beyond selected version
+
+gtoggle
+Common Report Var(flag_gtoggle)
+Toggle debug information generation
+
gvms
Common JoinedOrMissing Negative(gxcoff)
Generate debug information in VMS format
Common JoinedOrMissing Negative(gcoff)
Generate debug information in extended XCOFF format
+h
+Driver Joined Separate
+
+iplugindir=
+Common Joined Var(plugindir_string) Init(0)
+-iplugindir=<dir> Set <dir> to be the default plugin directory
+
+l
+Driver Joined Separate
+
+no-canonical-prefixes
+Driver
+
+nodefaultlibs
+Driver
+
+nostdlib
+Driver
+
o
-Common Joined Separate
+Common Driver Joined Separate Var(asm_file_name) MissingArgError(missing filename after %qs)
-o <file> Place output into <file>
p
Common Var(profile_flag)
Enable function profiling
+pass-exit-codes
+Driver Var(pass_exit_codes)
+
pedantic
Common Var(pedantic)
Issue warnings needed for strict compliance to the standard
pedantic-errors
-Common
+Common Var(flag_pedantic_errors)
Like -pedantic but issue them as errors
+pg
+Driver
+
+pipe
+Driver Var(use_pipes)
+
+print-file-name=
+Driver JoinedOrMissing Var(print_file_name)
+
+print-libgcc-file-name
+Driver
+
+print-multi-directory
+Driver Var(print_multi_directory)
+
+print-multi-lib
+Driver Var(print_multi_lib)
+
+print-multi-os-directory
+Driver Var(print_multi_os_directory)
+
+print-prog-name=
+Driver JoinedOrMissing Var(print_prog_name)
+
+print-search-dirs
+Driver Var(print_search_dirs)
+
+print-sysroot
+Driver Var(print_sysroot)
+
+print-sysroot-headers-suffix
+Driver Var(print_sysroot_headers_suffix)
+
quiet
-Common Var(quiet_flag)
+Common Var(quiet_flag) RejectDriver
Do not display functions compiled or elapsed time
+save-temps
+Driver
+
+save-temps=
+Driver Joined
+
+time
+Driver Var(report_times)
+
+time=
+Driver JoinedOrMissing
+
+u
+Driver Joined Separate
+
+undef
+Driver
+; C option, but driver must not handle as "-u ndef".
+
+v
+Common Driver Var(verbose_flag)
+Enable verbose output
+
version
-Common Var(version_flag)
+Common Var(version_flag) RejectDriver
Display the compiler's version
w
Common Var(inhibit_warnings)
Suppress warnings
+wrapper
+Driver Separate Var(wrapper_string)
+
+x
+Driver Joined Separate
+
shared
Common RejectNegative Negative(pie)
Create a shared library
+shared-libgcc
+Driver
+
+specs
+Driver Separate Alias(specs=)
+
+specs=
+Driver Joined
+
+static
+Driver
+
+static-libgcc
+Driver
+
+static-libgfortran
+Driver
+; Documented for Fortran, but always accepted by driver.
+
+static-libstdc++
+Driver
+
+symbolic
+Driver
+
pie
Common RejectNegative Negative(shared)
Create a position independent executable
+z
+Driver Joined Separate
+
; This comment is to ensure we retain the blank line above.
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