; Options for the language- and target-independent parts of the compiler. ; Copyright (C) 2003-2014 Free Software Foundation, Inc. ; ; This file is part of GCC. ; ; GCC is free software; you can redistribute it and/or modify it under ; the terms of the GNU General Public License as published by the Free ; Software Foundation; either version 3, or (at your option) any later ; version. ; ; GCC is distributed in the hope that it will be useful, but WITHOUT ANY ; WARRANTY; without even the implied warranty of MERCHANTABILITY or ; FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License ; for more details. ; ; You should have received a copy of the GNU General Public License ; along with GCC; see the file COPYING3. If not see ; . ; See the GCC internals manual (options.texi) for a description of this file's format. ; Please try to keep this file in ASCII collating order. Variable int target_flags Variable int optimize Variable int optimize_size Variable int optimize_debug ; Not used directly to control optimizations, only to save -Ofast ; setting for "optimize" attributes. Variable int optimize_fast ; True if this is the lto front end. This is used to disable gimple ; generation and lowering passes that are normally run on the output ; of a front end. These passes must be bypassed for lto since they ; have already been done before the gimple was written. Variable bool in_lto_p = false ; 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 ; Language specific warning pass for unused results. Variable bool flag_warn_unused_result = false Variable int *param_values ; 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 ; 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=. Variable unsigned int initial_max_fld_align = TARGET_DEFAULT_PACK_STRUCT ; Type of stack check. Variable enum stack_check_type flag_stack_check = NO_STACK_CHECK ; True if stack usage information needs to be computed. Variable bool flag_stack_usage_info = false ; -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 ; Name of top-level original source file (what was input to cpp). ; This comes from the #-command at the beginning of the actual input. ; If there isn't any there, then this is the cc1 input file name. Variable const char *main_input_filename ; Pointer to base name in main_input_filename, with directories and a ; single final extension removed, and the length of this base ; name. Variable const char *main_input_basename Variable int main_input_baselength ; Which options have been printed by --help. Variable char *help_printed ; Which enums have been printed by --help. 0 = not printed, no ; relevant options seen, 1 = relevant option seen, not yet printed, 2 ; = printed. Variable char *help_enum_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 ; What the sanitizer should instrument Variable unsigned int flag_sanitize ; Flag whether a prefix has been added to dump_base_name Variable bool dump_base_name_prefixed = false ### 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 Driver Var(help_flag) Display this information -help= Common Driver Report Joined --help= Display descriptions of a specific class of options. 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-sysroot-suffix Driver Var(no_sysroot_suffix) -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(Wpedantic) -pedantic-errors Common Alias(pedantic-errors) -pie Driver 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-multiarch Driver Alias(print-multiarch) -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 Driver Alias(shared) -specs Driver Separate Alias(specs=) -specs= Driver Joined Alias(specs=) -static Driver Alias(static) -symbolic Driver Alias(symbolic) -target-help Common Driver Alias for --help=target -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 Driver Alias(-help) fhelp= Common Driver Joined Alias(-help=) ftarget-help Common Driver Alias(-target-help) fversion Common Driver Alias(-version) -param Common Separate --param = Set parameter 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 Driver B Driver Joined Separate E Driver L Driver Joined Separate N Driver O Common JoinedOrMissing Optimization -O Set optimization level to Os Common Optimization Optimize for space rather than speed Ofast Common Optimization Optimize for speed disregarding exact standards compliance Og Common Optimization Optimize for debugging experience rather than speed or size Q Driver Qn Driver Negative(Qy) Qy Driver Negative(Qn) R Driver Joined Separate S Driver T Driver Joined Separate Tbss Driver Separate Tbss= Driver Joined Tdata Driver Separate Tdata= Driver Joined Ttext Driver Separate Ttext= Driver Joined W 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 Waggressive-loop-optimizations Common Var(warn_aggressive_loop_optimizations) Init(1) Warning Warn if a loop with constant number of iterations triggers undefined behavior Warray-bounds Common Var(warn_array_bounds) Warning Warn if an array is accessed out of bounds Wattributes Common Var(warn_attributes) Init(1) Warning Warn about inappropriate attribute usage Wcast-align 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 Wdisabled-optimization Common Var(warn_disabled_optimization) Warning Warn when an optimization pass is disabled Werror Common Var(warnings_are_errors) Treat all warnings as errors Werror= Common Joined Treat specified warning as error Wextra Common Var(extra_warnings) Warning Print extra (possibly unwanted) warnings Wfatal-errors Common Var(flag_fatal_errors) Exit on the first error occurred Wframe-larger-than= Common RejectNegative Joined UInteger -Wframe-larger-than= Warn if a function's stack frame requires more than bytes Wfree-nonheap-object Common Var(warn_free_nonheap_object) Init(1) Warning Warn when attempting to free a non-heap object Winline Common Var(warn_inline) Warning Warn when an inlined function cannot be inlined Winvalid-memory-model Common Var(warn_invalid_memory_model) Init(1) Warning Warn when an atomic memory model parameter is known to be outside the valid range. Wlarger-than- Common RejectNegative Joined Warning Undocumented Alias(Wlarger-than=) Wlarger-than= Common RejectNegative Joined UInteger Warning -Wlarger-than= Warn if an object is larger than bytes Wunsafe-loop-optimizations Common Var(warn_unsafe_loop_optimizations) Warning Warn if the loop cannot be optimized due to nontrivial assumptions. Wmissing-noreturn Common Alias(Wsuggest-attribute=noreturn) Woverflow Common Var(warn_overflow) Init(1) Warning Warn about overflow in arithmetic expressions Wpacked Common Var(warn_packed) Warning Warn when the packed attribute has no effect on struct layout Wpadded Common Var(warn_padded) Warning Warn when padding is required to align structure members Wpedantic Common Var(pedantic) Warning Issue warnings needed for strict compliance to the standard Wshadow Common Var(warn_shadow) Warning Warn when one local variable shadows another Wstack-protector Common Var(warn_stack_protect) Warning Warn when not issuing stack smashing protection for some reason Wstack-usage= Common Joined RejectNegative UInteger Var(warn_stack_usage) Init(-1) Warning Warn if stack usage might be larger than specified amount Wstrict-aliasing Common Warning Warn about code which might break strict aliasing rules Wstrict-aliasing= Common Joined RejectNegative UInteger Var(warn_strict_aliasing) Warning Warn about code which might break strict aliasing rules Wstrict-overflow Common Warning Warn about optimizations that assume that signed overflow is undefined Wstrict-overflow= Common Joined RejectNegative UInteger Var(warn_strict_overflow) 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)) Wsystem-headers 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) Warning EnabledBy(Wextra) 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 EnabledBy(Wextra) Warn about uninitialized automatic variables Wmaybe-uninitialized Common Var(warn_maybe_uninitialized) Warning EnabledBy(Wuninitialized) Warn about maybe uninitialized automatic variables Wunreachable-code 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) Warning EnabledBy(Wunused && Wextra) Warn when a function parameter is only set, otherwise unused Wunused-but-set-variable Common Var(warn_unused_but_set_variable) Warning EnabledBy(Wunused) Warn when a variable is only set, otherwise unused Wunused-function Common Var(warn_unused_function) Warning EnabledBy(Wunused) Warn when a function is unused Wunused-label Common Var(warn_unused_label) Warning EnabledBy(Wunused) Warn when a label is unused Wunused-parameter Common Var(warn_unused_parameter) Warning EnabledBy(Wunused && Wextra) Warn when a function parameter is unused Wunused-value Common Var(warn_unused_value) Warning EnabledBy(Wunused) Warn when an expression value is unused Wunused-variable Common Var(warn_unused_variable) Warning EnabledBy(Wunused) Warn when a variable is unused Wcoverage-mismatch Common Var(warn_coverage_mismatch) Init(1) Warning Warn in case profiles in -fprofile-use do not match Wvector-operation-performance Common Var(warn_vector_operation_performance) Warning Warn when a vector operation is compiled outside the SIMD Xassembler Driver Separate Xlinker Driver Separate Xpreprocessor Driver Separate Z Driver aux-info Common Separate Var(aux_info_file_name) -aux-info Emit declaration information into aux-info= Common Joined Alias(aux-info) auxbase Common Separate RejectDriver Var(aux_base_name) auxbase-strip Common Separate RejectDriver coverage Driver c Driver d Common Joined -d Enable dumps from specific passes of the compiler dumpbase Common Separate Var(dump_base_name) -dumpbase Set the file basename to be used for dumps dumpdir Common Separate Var(dump_dir_name) -dumpdir Set the directory name to be used for dumps dumpmachine Driver dumpspecs Driver dumpversion Driver e Driver Joined Separate ; This option has historically been passed down to the linker by an ; accident of a %{e*} spec, so ensure it continues to be passed down ; as a single option. The supported option for this purpose is ; -rdynamic. See PR 47390. export-dynamic Driver Undocumented ; 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 ; specification. This ABI may change as bugs are discovered and fixed. ; Therefore, 0 will not necessarily indicate the same ABI in different ; versions of G++. ; ; 1: The version of the ABI first used in G++ 3.2. ; ; 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. First selectable in G++ 4.5. ; ; 5: The version of the ABI that ignores attribute const/noreturn ; in function pointer mangling, and corrects mangling of decltype and ; function parameters used in other parameters and the return type. ; First selectable in G++ 4.6. ; ; 6: The version of the ABI that doesn't promote scoped enums to int and ; changes the mangling of template argument packs, const/static_cast, ; prefix ++ and --, and a class scope function used as a template ; argument. ; First selectable in G++ 4.7. ; ; 7: The version of the ABI that treats nullptr_t as a builtin type and ; corrects the mangling of lambdas in default argument scope. ; First selectable in G++ 4.8. ; ; 8: The version of the ABI that corrects the substitution behavior of ; function types with function-cv-qualifiers. ; First selectable in G++ 4.9. ; ; Additional positive integers will be assigned as new versions of ; the ABI become the default version of the ABI. fabi-version= Common Joined RejectNegative UInteger Var(flag_abi_version) Init(2) faggressive-loop-optimizations Common Report Var(flag_aggressive_loop_optimizations) Optimization Init(1) Aggressively optimize loops using language constraints falign-functions Common Report Var(align_functions,0) Optimization UInteger Align the start of functions falign-functions= 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 Var(align_jumps) falign-labels Common Report Var(align_labels,0) Optimization UInteger Align all labels falign-labels= Common RejectNegative Joined UInteger Var(align_labels) falign-loops Common Report Var(align_loops,0) Optimization UInteger Align the start of loops falign-loops= Common RejectNegative Joined UInteger Var(align_loops) fargument-alias Common Ignore Does nothing. Preserved for backward compatibility. fargument-noalias Common Ignore Does nothing. Preserved for backward compatibility. fargument-noalias-global Common Ignore Does nothing. Preserved for backward compatibility. fargument-noalias-anything Common Ignore Does nothing. Preserved for backward compatibility. fsanitize= Common Driver Report Joined Select what to sanitize fasynchronous-unwind-tables Common Report Var(flag_asynchronous_unwind_tables) Optimization Generate unwind tables that are exact at each instruction boundary fauto-inc-dec Common Report Var(flag_auto_inc_dec) Init(1) Generate auto-inc/dec instructions ; -fcheck-bounds causes gcc to generate array bounds checks. ; For C, C++ and ObjC: defaults off. ; For Java: defaults to on. ; For Fortran: defaults to off. fbounds-check 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) Optimization Replace add, compare, branch with branch on count register fbranch-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) Optimization Perform branch target load optimization before prologue / epilogue threading fbranch-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) Optimization Restrict target load migration not to re-use registers in any basic block fcall-saved- Common Joined RejectNegative Var(common_deferred_options) Defer -fcall-saved- Mark as being preserved across functions fcall-used- Common Joined RejectNegative Var(common_deferred_options) Defer -fcall-used- Mark as being corrupted by function calls ; Nonzero for -fcaller-saves: allocate values in regs that need to ; 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) Optimization Save registers around function calls fcheck-data-deps Common Report Var(flag_check_data_deps) Compare the results of several data dependence analyzers. fcheck-new Common Var(flag_check_new) Check the return value of new in C++ 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[=] Compile with and without e.g. -gtoggle, and compare the final-insns dump fcompare-debug-second Common Driver RejectNegative Var(flag_compare_debug) Run only the second compilation of -fcompare-debug fcompare-elim Common Report Var(flag_compare_elim_after_reload) Optimization Perform comparison elimination after register allocation has finished fconserve-stack Common Var(flag_conserve_stack) Optimization Do not perform optimizations increasing noticeably stack usage fcprop-registers Common Report Var(flag_cprop_registers) Optimization Perform a register copy-propagation optimization pass fcrossjumping Common Report Var(flag_crossjumping) Optimization Perform cross-jumping optimization fcse-follow-jumps Common Report Var(flag_cse_follow_jumps) Optimization When running CSE, follow jumps to their targets fcse-skip-blocks Common Ignore Does nothing. Preserved for backward compatibility. fcx-limited-range Common Report Var(flag_cx_limited_range) Optimization SetByCombined 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 fdbg-cnt-list Common Report Var(common_deferred_options) Defer List all available debugging counters with their limits and counts. fdbg-cnt= Common RejectNegative Joined Var(common_deferred_options) Defer -fdbg-cnt=:[,:,...] Set the debug counter limit. fdebug-prefix-map= Common Joined RejectNegative Var(common_deferred_options) Defer Map one directory name to another in debug information fdebug-types-section Common Report Var(flag_debug_types_section) Init(0) Output .debug_types section when using DWARF v4 debuginfo. ; 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) Optimization Defer popping functions args from stack until later fdelayed-branch Common Report Var(flag_delayed_branch) Optimization Attempt to fill delay slots of branch instructions fdelete-dead-exceptions Common Report Var(flag_delete_dead_exceptions) Init(0) Delete dead instructions that may throw exceptions fdelete-null-pointer-checks Common Report Var(flag_delete_null_pointer_checks) Init(1) Optimization Delete useless null pointer checks fdevirtualize-speculatively Common Report Var(flag_devirtualize_speculatively) Optimization Perform speculative devirtualization fdevirtualize Common Report Var(flag_devirtualize) Optimization Try to convert virtual calls to direct ones. fdiagnostics-show-location= Common Joined RejectNegative Enum(diagnostic_prefixing_rule) -fdiagnostics-show-location=[once|every-line] How often to emit source location at the beginning of line-wrapped diagnostics ; Required for these enum values. SourceInclude pretty-print.h Enum Name(diagnostic_prefixing_rule) Type(int) EnumValue Enum(diagnostic_prefixing_rule) String(once) Value(DIAGNOSTICS_SHOW_PREFIX_ONCE) EnumValue Enum(diagnostic_prefixing_rule) String(every-line) Value(DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE) fdiagnostics-show-caret Common Var(flag_diagnostics_show_caret) Init(1) Show the source line with a caret indicating the column fdiagnostics-color Common Alias(fdiagnostics-color=,always,never) ; fdiagnostics-color= Common Joined RejectNegative Var(flag_diagnostics_show_color) Enum(diagnostic_color_rule) Init(DIAGNOSTICS_COLOR_NO) -fdiagnostics-color=[never|always|auto] Colorize diagnostics ; Required for these enum values. SourceInclude diagnostic-color.h Enum Name(diagnostic_color_rule) Type(int) EnumValue Enum(diagnostic_color_rule) String(never) Value(DIAGNOSTICS_COLOR_NO) EnumValue Enum(diagnostic_color_rule) String(always) Value(DIAGNOSTICS_COLOR_YES) EnumValue Enum(diagnostic_color_rule) String(auto) Value(DIAGNOSTICS_COLOR_AUTO) fdiagnostics-show-option Common Var(flag_diagnostics_show_option) Init(1) Amend appropriate diagnostic messages with the command line option that controls them fdisable- Common Joined RejectNegative Var(common_deferred_options) Defer -fdisable-[tree|rtl|ipa]-=range1+range2 disables an optimization pass fenable- Common Joined RejectNegative Var(common_deferred_options) Defer -fenable-[tree|rtl|ipa]-=range1+range2 enables an optimization pass fdump- Common Joined RejectNegative Var(common_deferred_options) Defer -fdump- 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-passes Common Var(flag_dump_passes) Init(0) Dump optimization passes fdump-unnumbered 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. fearly-inlining Common Report Var(flag_early_inlining) Init(1) Optimization Perform early inlining feliminate-dwarf2-dups 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 feliminate-unused-debug-types Common Report Var(flag_eliminate_unused_debug_types) Init(1) Perform unused type elimination in debug info femit-class-debug-always Common Report Var(flag_emit_class_debug_always) Init(0) Do not suppress C++ class debug information. fexceptions Common Report Var(flag_exceptions) Optimization Enable exception handling fexpensive-optimizations Common Report Var(flag_expensive_optimizations) Optimization Perform a number of minor, expensive optimizations fexcess-precision= Common Joined RejectNegative Enum(excess_precision) Var(flag_excess_precision_cmdline) Init(EXCESS_PRECISION_DEFAULT) -fexcess-precision=[fast|standard] Specify handling of excess floating-point precision Enum Name(excess_precision) Type(enum excess_precision) UnknownError(unknown excess precision style %qs) EnumValue Enum(excess_precision) String(fast) Value(EXCESS_PRECISION_FAST) EnumValue Enum(excess_precision) String(standard) Value(EXCESS_PRECISION_STANDARD) ffast-math Common ffat-lto-objects Common Var(flag_fat_lto_objects) Output lto objects containing both the intermediate language and binary output. ffinite-math-only Common Report Var(flag_finite_math_only) Optimization SetByCombined Assume no NaNs or infinities are generated ffixed- Common Joined RejectNegative Var(common_deferred_options) Defer -ffixed- Mark as being unavailable to the compiler ffloat-store Common Report Var(flag_float_store) Optimization Don't allocate floats and doubles in extended-precision registers fforce-addr 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 Enum(fp_contract_mode) Var(flag_fp_contract_mode) Init(FP_CONTRACT_FAST) -ffp-contract=[off|on|fast] Perform floating-point expression contraction. Enum Name(fp_contract_mode) Type(enum fp_contract_mode) UnknownError(unknown floating point contraction style %qs) EnumValue Enum(fp_contract_mode) String(off) Value(FP_CONTRACT_OFF) ; Not implemented, fall back to conservative FP_CONTRACT_OFF. EnumValue Enum(fp_contract_mode) String(on) Value(FP_CONTRACT_OFF) EnumValue Enum(fp_contract_mode) String(fast) Value(FP_CONTRACT_FAST) ; 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. ffunction-cse Common Report Var(flag_no_function_cse,0) Allow function addresses to be held in registers ffunction-sections Common Report Var(flag_function_sections) Place each function into its own section fgcse Common Report Var(flag_gcse) Optimization Perform global common subexpression elimination fgcse-lm 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) Optimization Perform store motion after global common subexpression elimination fgcse-las 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) Optimization Perform global common subexpression elimination after register allocation has finished ; This option is not documented yet as its semantics will change. fgraphite 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 fhoist-adjacent-loads Common Report Var(flag_hoist_adjacent_loads) Optimization Enable hoisting adjacent loads to encourage generating conditional move instructions 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 floop-interchange Common Report Var(flag_loop_interchange) Optimization Enable Loop Interchange transformation floop-block Common Report Var(flag_loop_block) Optimization Enable Loop Blocking transformation fgnu-tm Common Report Var(flag_tm) Enable support for GNU transactional memory fgnu-unique Common Report Var(flag_gnu_unique) Init(1) Use STB_GNU_UNIQUE if supported by the assembler floop-flatten Common Ignore Does nothing. Preserved for backward compatibility. floop-nest-optimize Common Report Var(flag_loop_optimize_isl) Optimization Enable the ISL based loop nest optimizer 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 ; Nonzero means ignore `#ident' directives. 0 means handle them. ; Generate position-independent code for executables if possible ; On SVR4 targets, it also controls whether or not to emit a ; string identifying the compiler. fident Common Report Var(flag_no_ident,0) Process #ident directives fif-conversion Common Report Var(flag_if_conversion) Optimization Perform conversion of conditional jumps to branchless equivalents fif-conversion2 Common Report Var(flag_if_conversion2) Optimization Perform conversion of conditional jumps to conditional execution fstack-reuse= Common Joined RejectNegative Enum(stack_reuse_level) Var(flag_stack_reuse) Init(SR_ALL) -fstack-reuse=[all|named_vars|none] Set stack reuse level for local variables. Enum Name(stack_reuse_level) Type(enum stack_reuse_level) UnknownError(unknown Stack Reuse Level %qs) EnumValue Enum(stack_reuse_level) String(all) Value(SR_ALL) EnumValue Enum(stack_reuse_level) String(named_vars) Value(SR_NAMED_VARS) EnumValue Enum(stack_reuse_level) String(none) Value(SR_NONE) 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 ; needed for crtstuff.c on other systems. finhibit-size-directive Common Report Var(flag_inhibit_size_directive) Do not generate .size directives findirect-inlining Common Report Var(flag_indirect_inlining) Perform indirect inlining ; General flag to enable inlining. Specifying -fno-inline will disable ; all inlining apart from always-inline functions. finline Common Report Var(flag_no_inline,0) Init(0) Optimization Enable inlining of function declared \"inline\", disabling disables all inlining finline-small-functions Common Report Var(flag_inline_small_functions) Optimization Integrate functions into their callers when code size is known not to grow finline-functions Common Report Var(flag_inline_functions) Optimization Integrate functions not declared \"inline\" into their callers when profitable finline-functions-called-once Common Report Var(flag_inline_functions_called_once) Optimization Integrate functions only required by their single caller finline-limit- Common RejectNegative Joined Alias(finline-limit=) finline-limit= Common RejectNegative Joined UInteger -finline-limit= Limit the size of inlined functions to finline-atomics Common Report Var(flag_inline_atomics) Init(1) Optimization Inline __atomic operations when a lock free instruction sequence is available. finstrument-functions Common Report Var(flag_instrument_function_entry_exit) Instrument function entry and exit with profiling calls finstrument-functions-exclude-function-list= Common RejectNegative Joined -finstrument-functions-exclude-function-list=name,... Do not instrument listed functions finstrument-functions-exclude-file-list= Common RejectNegative Joined -finstrument-functions-exclude-file-list=filename,... Do not instrument functions listed in files fipa-cp Common Report Var(flag_ipa_cp) Optimization Perform interprocedural constant propagation fipa-cp-clone Common Report Var(flag_ipa_cp_clone) Optimization Perform cloning to make Interprocedural constant propagation stronger 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-matrix-reorg Common Ignore Does nothing. Preserved for backward compatibility. fipa-struct-reorg Common Ignore Does nothing. Preserved for backward compatibility. fira-algorithm= Common Joined RejectNegative Enum(ira_algorithm) Var(flag_ira_algorithm) Init(IRA_ALGORITHM_CB) -fira-algorithm=[CB|priority] Set the used IRA algorithm Enum Name(ira_algorithm) Type(enum ira_algorithm) UnknownError(unknown IRA algorithm %qs) EnumValue Enum(ira_algorithm) String(CB) Value(IRA_ALGORITHM_CB) EnumValue Enum(ira_algorithm) String(priority) Value(IRA_ALGORITHM_PRIORITY) fira-region= Common Joined RejectNegative Enum(ira_region) Var(flag_ira_region) Init(IRA_REGION_AUTODETECT) -fira-region=[one|all|mixed] Set regions for IRA Enum Name(ira_region) Type(enum ira_region) UnknownError(unknown IRA region %qs) EnumValue Enum(ira_region) String(one) Value(IRA_REGION_ONE) EnumValue Enum(ira_region) String(all) Value(IRA_REGION_ALL) EnumValue Enum(ira_region) String(mixed) Value(IRA_REGION_MIXED) fira-hoist-pressure Common Report Var(flag_ira_hoist_pressure) Init(1) Optimization Use IRA based register pressure calculation in RTL hoist optimizations. fira-loop-pressure Common Report Var(flag_ira_loop_pressure) Optimization 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 slots for saving different hard registers. fira-share-spill-slots Common Report Var(flag_ira_share_spill_slots) Init(1) Share stack slots for spilled pseudo-registers. fira-verbose= Common RejectNegative Joined UInteger Var(flag_ira_verbose) Init(5) -fira-verbose= Control IRA's level of diagnostic messages. fivopts Common Report Var(flag_ivopts) Init(1) Optimization Optimize induction variables on trees fjump-tables Common Var(flag_jump_tables) Init(1) Optimization Use jump tables for sufficiently large switch statements fkeep-inline-functions Common Report Var(flag_keep_inline_functions) Generate code for functions even if they are fully inlined fkeep-static-consts Common Report Var(flag_keep_static_consts) Init(1) Emit static const variables even if they are not used fleading-underscore Common Report Var(flag_leading_underscore) Init(-1) Give external symbols a leading underscore floop-optimize 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 symbols 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=max Common Var(flag_lto_partition_max) Put every symbol into separate partition 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= Use zlib compression level for IL flto-report Common Report Var(flag_lto_report) Init(0) Report various link-time optimization statistics flto-report-wpa Common Report Var(flag_lto_report_wpa) Init(0) Report various link-time optimization statistics for WPA only fmath-errno Common Report Var(flag_errno_math) Init(1) Optimization SetByCombined Set errno after built-in math functions fmax-errors= Common Joined RejectNegative UInteger Var(flag_max_errors) -fmax-errors= Maximum number of errors to report fmem-report Common Report Var(mem_report) Report on permanent memory allocation fmem-report-wpa Common Report Var(mem_report_wpa) Report on permanent memory allocation in WPA only ; This will attempt to merge constant section constants, if 1 only ; string constants and constants from constant pool, if 2 also constant ; variables. fmerge-all-constants 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) Optimization Attempt to merge identical constants across compilation units fmerge-debug-strings Common Report Var(flag_merge_debug_strings) Init(1) Attempt to merge identical debug strings across compilation units fmessage-length= Common RejectNegative Joined UInteger -fmessage-length= Limit diagnostics to characters per line. 0 suppresses line-wrapping fmodulo-sched Common Report Var(flag_modulo_sched) Optimization Perform SMS based modulo scheduling before the first scheduling pass fmodulo-sched-allow-regmoves Common Report Var(flag_modulo_sched_allow_regmoves) Perform SMS based modulo scheduling with register moves allowed fmove-loop-invariants Common Report Var(flag_move_loop_invariants) Optimization Move loop invariant computations out of loops fdce Common Var(flag_dce) Init(1) Optimization Use the RTL dead code elimination pass fdse Common Var(flag_dse) Init(1) Optimization Use the RTL dead store elimination pass freschedule-modulo-scheduled-loops 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) Optimization Support synchronous non-call exceptions fomit-frame-pointer Common Report Var(flag_omit_frame_pointer) Optimization When possible do not generate stack frames fopt-info Common Report Var(flag_opt_info) Optimization Enable all optimization info dumps on stderr fopt-info- Common Joined RejectNegative Var(common_deferred_options) Defer -fopt-info[-=filename] Dump compiler optimization details foptimize-register-move Common Ignore Does nothing. Preserved for backward compatibility. foptimize-sibling-calls 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 fpost-ipa-mem-report Common Report Var(post_ipa_mem_report) Report on memory allocation before interprocedural optimization fpack-struct Common Report Var(flag_pack_struct) Optimization Pack structure members together without holes fpack-struct= Common RejectNegative Joined UInteger Optimization -fpack-struct= Set initial maximum structure member alignment fpcc-struct-return Common Report Var(flag_pcc_struct_return,1) Init(DEFAULT_PCC_STRUCT_RETURN) Return small aggregates in memory, not registers fpeel-loops Common Report Var(flag_peel_loops) Optimization Perform loop peeling fpeephole Common Report Var(flag_no_peephole,0) Optimization Enable machine specific peephole optimizations fpeephole2 Common Report Var(flag_peephole2) Optimization Enable an RTL peephole pass before sched2 fPIC Common Report Var(flag_pic,2) Negative(fPIE) Generate position-independent code if possible (large mode) fPIE Common Report Var(flag_pie,2) Negative(fpic) Generate position-independent code for executables if possible (large mode) fpic Common Report Var(flag_pic,1) Negative(fpie) Generate position-independent code if possible (small mode) fpie Common Report Var(flag_pie,1) Negative(fPIC) 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--[=] Specify argument = for plugin fpredictive-commoning Common Report Var(flag_predictive_commoning) Optimization Run predictive commoning optimization. fprefetch-loop-arrays Common Report Var(flag_prefetch_loop_arrays) Init(-1) Optimization Generate prefetch instructions, if available, for arrays in loops fprofile Common Report Var(profile_flag) Enable basic program profiling code fprofile-arcs Common Report Var(profile_arc_flag) Insert arc-based program profiling code fprofile-dir= Common Joined RejectNegative Var(profile_data_prefix) Set the top-level directory for storing the profile data. The default is 'pwd'. fprofile-correction Common Report Var(flag_profile_correction) Enable correction of flow inconsistent profile data input 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 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 fprofile-report Common Report Var(profile_report) Report on consistency of profile fprofile-reorder-functions Common Report Var(flag_profile_reorder_functions) Enable function reordering that improves code placement frandom-seed Common Var(common_deferred_options) Defer frandom-seed= Common Joined RejectNegative Var(common_deferred_options) Defer -frandom-seed= Make compile reproducible using ; This switch causes the command line that was used to create an ; object file to be recorded into the object file. The exact format ; of this recording is target and binary file format dependent. ; It is related to the -fverbose-asm switch, but that switch only ; records information in the assembler output file as comments, so ; they never reach the object file. frecord-gcc-switches 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) Optimization Return small aggregates in registers fregmove Common Ignore Does nothing. Preserved for backward compatibility. flifetime-dse Common Report Var(flag_lifetime_dse) Init(1) Optimization Tell DSE that the storage for a C++ object is dead when the constructor starts and when the destructor finishes. flive-range-shrinkage Common Report Var(flag_live_range_shrinkage) Init(0) Optimization Relief of register pressure through live range shrinkage frename-registers Common Report Var(flag_rename_registers) Init(2) Optimization Perform a register renaming optimization pass freorder-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) Optimization Reorder basic blocks and partition into hot and cold sections freorder-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) Optimization Add a common subexpression elimination pass after loop optimizations frerun-loop-opt Common Ignore Does nothing. Preserved for backward compatibility. frounding-math Common Report Var(flag_rounding_math) Optimization SetByCombined Disable optimizations that assume default FP rounding behavior fsched-interblock 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 fsched-spec-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) Optimization Allow speculative motion of more loads fsched-verbose= Common RejectNegative Joined UInteger Var(sched_verbose_param) -fsched-verbose= Set the verbosity level of the scheduler fsched2-use-superblocks Common Report Var(flag_sched2_use_superblocks) Optimization If scheduling post reload, do superblock scheduling fsched2-use-traces Common Ignore Does nothing. Preserved for backward compatibility. fschedule-insns Common Report Var(flag_schedule_insns) Optimization Reschedule instructions before register allocation fschedule-insns2 Common Report Var(flag_schedule_insns_after_reload) Optimization Reschedule instructions after register allocation ; This flag should be on when a target implements non-trivial ; scheduling hooks, maybe saving some information for its own sake. ; On IA64, for example, this is used for correct bundling. fselective-scheduling Common Report Var(flag_selective_scheduling) Optimization Schedule instructions using selective scheduling algorithm fselective-scheduling2 Common Report Var(flag_selective_scheduling2) Optimization Run selective scheduling after reload fsel-sched-pipelining Common Report Var(flag_sel_sched_pipelining) Init(0) Optimization Perform software pipelining of inner loops during selective scheduling fsel-sched-pipelining-outer-loops Common Report Var(flag_sel_sched_pipelining_outer_loops) Init(0) Optimization Perform software pipelining of outer loops during selective scheduling fsel-sched-reschedule-pipelined Common Report Var(flag_sel_sched_reschedule_pipelined) Init(0) Optimization Reschedule pipelined regions without pipelining ; 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) Optimization UInteger Allow premature scheduling of queued insns fsched-stalled-insns= Common RejectNegative Joined UInteger -fsched-stalled-insns= Set number of queued insns that can be prematurely scheduled ; sched_stalled_insns_dep controls how many recently scheduled cycles will ; be examined for a dependency on a stalled insn that is candidate for ; 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) Optimization UInteger Set dependence distance checking in premature scheduling of queued insns fsched-stalled-insns-dep= Common RejectNegative Joined UInteger -fsched-stalled-insns-dep= 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 fsee Common Ignore Does nothing. Preserved for backward compatibility. fzee Common Ignore Does nothing. Preserved for backward compatibility. free Common Report Var(flag_ree) Init(0) Turn on Redundant Extensions Elimination pass. fshow-column Common Report Var(flag_show_column) Init(1) Show column numbers in diagnostics, when available. Default on fshrink-wrap Common Report Var(flag_shrink_wrap) Optimization Emit function prologues only before parts of the function that need it, rather than at the top of the function. fsignaling-nans Common Report Var(flag_signaling_nans) Optimization SetByCombined Disable optimizations observable by IEEE signaling NaNs fsigned-zeros Common Report Var(flag_signed_zeros) Init(1) Optimization SetByCombined Disable floating point optimizations that ignore the IEEE signedness of zero fsingle-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) 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 fvariable-expansion-in-unroller Common Report Var(flag_variable_expansion_in_unroller) Optimization Apply variable expansion when loops are unrolled fstack-check= Common Report RejectNegative Joined -fstack-check=[no|generic|specific] Insert stack checking code into the program fstack-check Common Alias(fstack-check=, specific, no) Insert stack checking code into the program. Same as -fstack-check=specific fstack-limit Common Var(common_deferred_options) Defer fstack-limit-register= Common RejectNegative Joined Var(common_deferred_options) Defer -fstack-limit-register= Trap if the stack goes past fstack-limit-symbol= Common RejectNegative Joined Var(common_deferred_options) Defer -fstack-limit-symbol= Trap if the stack goes past symbol fstack-protector Common Report Var(flag_stack_protect, 1) Use propolice as a stack protection method fstack-protector-all Common Report RejectNegative Var(flag_stack_protect, 2) Use a stack protection method for every function fstack-protector-strong Common Report RejectNegative Var(flag_stack_protect, 3) Use a smart stack protection method for certain functions fstack-usage Common RejectNegative Var(flag_stack_usage) Output stack usage information on a per-function basis fstrength-reduce Common Ignore Does nothing. Preserved for backward compatibility. ; Nonzero if we should do (language-dependent) alias analysis. ; Typically, this analysis will assume that expressions of certain ; 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) Optimization Assume strict aliasing rules apply fstrict-overflow Common Report Var(flag_strict_overflow) Treat signed overflow as undefined fsync-libcalls Common Report Var(flag_sync_libcalls) Init(1) Implement __atomic operations via libcalls to legacy __sync functions fsyntax-only Common Report Var(flag_syntax_only) Check for syntax errors, then stop ftest-coverage Common Report Var(flag_test_coverage) Create data files needed by \"gcov\" fthread-jumps Common Report Var(flag_thread_jumps) Optimization Perform jump threading optimizations ftime-report Common Report Var(time_report) Report the time taken by each compiler pass ftls-model= Common Joined RejectNegative Enum(tls_model) Var(flag_tls_default) Init(TLS_MODEL_GLOBAL_DYNAMIC) -ftls-model=[global-dynamic|local-dynamic|initial-exec|local-exec] Set the default thread-local storage code generation model Enum Name(tls_model) Type(enum tls_model) UnknownError(unknown TLS model %qs) EnumValue Enum(tls_model) String(global-dynamic) Value(TLS_MODEL_GLOBAL_DYNAMIC) EnumValue Enum(tls_model) String(local-dynamic) Value(TLS_MODEL_LOCAL_DYNAMIC) EnumValue Enum(tls_model) String(initial-exec) Value(TLS_MODEL_INITIAL_EXEC) EnumValue Enum(tls_model) String(local-exec) Value(TLS_MODEL_LOCAL_EXEC) ftoplevel-reorder Common Report Var(flag_toplevel_reorder) Init(2) Optimization Reorder top level functions, variables, and asms ftracer Common Report Var(flag_tracer) Perform superblock formation via tail duplication ; Zero means that floating-point math operations cannot generate a ; (user-visible) trap. This is the case, for example, in nonstop ; IEEE 754 arithmetic. ftrapping-math Common Report Var(flag_trapping_math) Init(1) Optimization SetByCombined Assume floating-point operations can trap ftrapv Common Report Var(flag_trapv) Optimization Trap for signed overflow in addition, subtraction and multiplication ftree-ccp 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 Ignore Does nothing. Preserved for backward compatibility. ftree-ch Common Report Var(flag_tree_ch) Optimization Enable loop header copying on trees ftree-coalesce-inlined-vars Common Report Var(flag_ssa_coalesce_vars,1) Init(2) RejectNegative Optimization Enable coalescing of copy-related user variables that are inlined ftree-coalesce-vars Common Report Var(flag_ssa_coalesce_vars,2) Optimization Enable coalescing of all copy-related user variables ftree-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) Optimization Enable copy propagation on trees ftree-store-copy-prop Common Ignore Does nothing. Preserved for backward compatibility. ftree-cselim Common Report Var(flag_tree_cselim) Init(2) Optimization Transform condition stores into unconditional ones ftree-switch-conversion Common Report Var(flag_tree_switch_conversion) Optimization Perform conversions of switch initializations. ftree-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) Optimization Enable dominator optimizations ftree-tail-merge Common Report Var(flag_tree_tail_merge) Optimization Enable tail merging on trees ftree-dse 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 foptimize-strlen Common Report Var(flag_optimize_strlen) Optimization Enable string length optimizations on trees fisolate-erroneous-paths-dereference Common Report Var(flag_isolate_erroneous_paths_dereference) Optimization Detect paths which trigger erroneous or undefined behaviour due to dereferencing a NULL pointer. Isolate those paths from the main control flow and turn the statement with erroneous or undefined behaviour into a trap. fisolate-erroneous-paths-attribute Common Report Var(flag_isolate_erroneous_paths_attribute) Optimization Detect paths which trigger erroneous or undefined behaviour due a NULL value being used in a way which is forbidden by a returns_nonnull or nonnull attribute. Isolate those paths from the main control flow and turn the statement with erroneous or undefined behaviour into a trap. ftree-loop-distribution 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 ftree-loop-linear Common Alias(floop-interchange) Enable loop interchange transforms. Same as -floop-interchange ftree-loop-ivcanon 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) Optimization Enable loop optimizations on tree level ftree-parallelize-loops= 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-partial-pre Common Report Var(flag_tree_partial_pre) Optimization In SSA-PRE optimization on trees, enable partial-partial redundancy elimination ftree-pta Common Report Var(flag_tree_pta) 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 Ignore Does nothing. Preserved for backward compatibility. ftree-sink Common Report Var(flag_tree_sink) Optimization Enable SSA code sinking on trees ftree-slsr Common Report Var(flag_tree_slsr) Optimization Perform straight-line strength reduction ftree-sra Common Report Var(flag_tree_sra) Optimization Perform scalar replacement of aggregates ftree-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) Optimization Perform Value Range Propagation on trees funit-at-a-time Common Report Var(flag_unit_at_a_time) Init(1) Optimization Compile whole compilation unit at a time funroll-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) 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) Optimization Allow loop optimizations to assume that the loops behave in normal way fassociative-math Common Report Var(flag_associative_math) SetByCombined Allow optimization for floating-point arithmetic which may change the result of the operation due to rounding. freciprocal-math Common Report Var(flag_reciprocal_math) SetByCombined Same as -fassociative-math for expressions which include division. ; Nonzero means that unsafe floating-point math optimizations are allowed ; for the sake of speed. IEEE compliance is not guaranteed, and operations ; 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) Optimization SetByCombined Allow math optimizations that may violate IEEE or ISO standards funswitch-loops Common Report Var(flag_unswitch_loops) Optimization Perform loop unswitching funwind-tables Common Report Var(flag_unwind_tables) Optimization Just generate unwind tables for exception handling fuse-ld=bfd Common Driver Negative(fuse-ld=gold) Use the bfd linker instead of the default linker fuse-ld=gold Common Driver Negative(fuse-ld=bfd) Use the gold linker instead of the default linker fuse-linker-plugin Common Undocumented Var(flag_use_linker_plugin) ; 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) 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 ; Positive if we should track uninitialized variables, negative if ; we should run the var-tracking pass only to discard debug ; annotations. When flag_var_tracking_uninit == AUTODETECT_VALUE it ; will be set according to flag_var_tracking. fvar-tracking-uninit Common Report Var(flag_var_tracking_uninit) Optimization Perform variable tracking and also tag variables that are uninitialized ftree-vectorize Common Report Var(flag_tree_vectorize) Optimization Enable vectorization on trees ftree-vectorizer-verbose= Common Joined RejectNegative Ignore Does nothing. Preserved for backward compatibility. ftree-loop-vectorize Common Report Var(flag_tree_loop_vectorize) Optimization Enable loop vectorization on trees ftree-slp-vectorize Common Report Var(flag_tree_slp_vectorize) Optimization Enable basic block vectorization (SLP) on trees fvect-cost-model= Common Joined RejectNegative Enum(vect_cost_model) Var(flag_vect_cost_model) Init(VECT_COST_MODEL_DEFAULT) Specifies the cost model for vectorization fsimd-cost-model= Common Joined RejectNegative Enum(vect_cost_model) Var(flag_simd_cost_model) Init(VECT_COST_MODEL_UNLIMITED) Specifies the vectorization cost model for code marked with a simd directive Enum Name(vect_cost_model) Type(enum vect_cost_model) UnknownError(unknown vectorizer cost model %qs) EnumValue Enum(vect_cost_model) String(unlimited) Value(VECT_COST_MODEL_UNLIMITED) EnumValue Enum(vect_cost_model) String(dynamic) Value(VECT_COST_MODEL_DYNAMIC) EnumValue Enum(vect_cost_model) String(cheap) Value(VECT_COST_MODEL_CHEAP) fvect-cost-model Common RejectNegative Alias(fvect-cost-model=,dynamic) Enables the dynamic vectorizer cost model. Preserved for backward compatibility. fno-vect-cost-model Common RejectNegative Alias(fvect-cost-model=,unlimited) Enables the unlimited vectorizer cost model. Preserved for backward compatibility. ftree-vect-loop-version Common Ignore Does nothing. Preserved for backward compatibility. ftree-scev-cprop Common Report Var(flag_tree_scev_cprop) Init(1) Optimization Enable copy propagation of scalar-evolution information. ; -fverbose-asm causes extra 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). ; -fno-verbose-asm, the default, causes the extra information ; to not be added and is useful when comparing two assembler files. fverbose-asm Common Report Var(flag_verbose_asm) Add extra commentary to assembler output fvisibility= Common Joined RejectNegative Enum(symbol_visibility) Var(default_visibility) Init(VISIBILITY_DEFAULT) -fvisibility=[default|internal|hidden|protected] Set the default symbol visibility Enum Name(symbol_visibility) Type(enum symbol_visibility) UnknownError(unrecognized visibility value %qs) EnumValue Enum(symbol_visibility) String(default) Value(VISIBILITY_DEFAULT) EnumValue Enum(symbol_visibility) String(internal) Value(VISIBILITY_INTERNAL) EnumValue Enum(symbol_visibility) String(hidden) Value(VISIBILITY_HIDDEN) EnumValue Enum(symbol_visibility) String(protected) Value(VISIBILITY_PROTECTED) fvtable-verify= Common Joined RejectNegative Enum(vtv_priority) Var(flag_vtable_verify) Init(VTV_NO_PRIORITY) Validate vtable pointers before using them. Enum Name(vtv_priority) Type(enum vtv_priority) UnknownError(unknown vtable verify initialization priority %qs) EnumValue Enum(vtv_priority) String(none) Value(VTV_NO_PRIORITY) EnumValue Enum(vtv_priority) String(std) Value(VTV_STANDARD_PRIORITY) EnumValue Enum(vtv_priority) String(preinit) Value(VTV_PREINIT_PRIORITY) fvtv-counts Common Var(flag_vtv_counts) Output vtable verification counters. fvtv-debug Common Var(flag_vtv_debug) Output vtable verification pointer sets information. fvpt Common Report Var(flag_value_profile_transformations) Optimization Use expression value profiles in optimizations fweb 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 fwrapv Common Report Var(flag_wrapv) Optimization Assume signed arithmetic overflow wraps around fzero-initialized-in-bss Common Report Var(flag_zero_initialized_in_bss) Init(1) Put zero initialized data in the bss section g Common JoinedOrMissing Generate debug information in default format gcoff Common JoinedOrMissing Negative(gdwarf) Generate debug information in COFF format gdwarf Common JoinedOrMissing Negative(gdwarf-) Generate debug information in default version of DWARF format gdwarf- Common Joined UInteger Var(dwarf_version) Init(4) Negative(gstabs) Generate debug information in DWARF v2 (or later) format ggdb Common JoinedOrMissing Generate debug information in default extended format gno-pubnames Common Negative(gpubnames) Var(debug_generate_pub_sections, 0) Init(-1) Don't generate DWARF pubnames and pubtypes sections. gpubnames Common Negative(ggnu-pubnames) Var(debug_generate_pub_sections, 1) Generate DWARF pubnames and pubtypes sections. ggnu-pubnames Common Negative(gno-pubnames) Var(debug_generate_pub_sections, 2) Generate DWARF pubnames and pubtypes sections with GNU extensions. gno-record-gcc-switches Common RejectNegative Var(dwarf_record_gcc_switches,0) Init(1) Don't record gcc command line switches in DWARF DW_AT_producer. grecord-gcc-switches Common RejectNegative Var(dwarf_record_gcc_switches,1) Record gcc command line switches in DWARF DW_AT_producer. gno-split-dwarf Common Driver RejectNegative Var(dwarf_split_debug_info,0) Init(0) Don't generate debug information in separate .dwo files gsplit-dwarf Common Driver RejectNegative Var(dwarf_split_debug_info,1) Generate debug information in separate .dwo files gstabs Common JoinedOrMissing Negative(gstabs+) Generate debug information in STABS format gstabs+ Common JoinedOrMissing Negative(gvms) Generate debug information in extended STABS format gno-strict-dwarf Common RejectNegative Var(dwarf_strict,0) Init(0) 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 gxcoff Common JoinedOrMissing Negative(gxcoff+) Generate debug information in XCOFF format gxcoff+ Common JoinedOrMissing Negative(gcoff) Generate debug information in extended XCOFF format h Driver Joined Separate iplugindir= Common Joined Var(plugindir_string) Init(0) -iplugindir= Set to be the default plugin directory imultiarch Common Joined Separate RejectDriver Var(imultiarch) Init(0) -imultiarch Set to be the multiarch include subdirectory l Driver Joined Separate n Driver no-canonical-prefixes Driver nodefaultlibs Driver nostartfiles Driver nostdlib Driver o Common Driver Joined Separate Var(asm_file_name) MissingArgError(missing filename after %qs) -o Place output into p Common Var(profile_flag) Enable function profiling pass-exit-codes Driver Var(pass_exit_codes) pedantic Common Alias(Wpedantic) pedantic-errors 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-multiarch Driver Var(print_multiarch) 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) RejectDriver Do not display functions compiled or elapsed time r Driver s Driver save-temps Driver save-temps= Driver Joined t Driver 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) RejectDriver Display the compiler's version w Common Var(inhibit_warnings) Suppress warnings wrapper Driver Separate Var(wrapper_string) x Driver Joined Separate shared Driver 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 static-libgo Driver ; Documented for Go, but always accepted by driver. static-libasan Driver static-libtsan Driver static-liblsan Driver static-libubsan Driver symbolic Driver pie Driver RejectNegative Negative(shared) Create a position independent executable z Driver Joined Separate ; This comment is to ensure we retain the blank line above.