; Options for the language- and target-independent parts of the compiler. ; Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 ; 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 ; 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 Variable enum vect_verbosity_levels user_vect_verbosity_level = MAX_VERBOSITY_LEVEL ; 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 Variable enum graph_dump_types graph_dump_format = no_graph ; 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 ### 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-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 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 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 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 Winline Common Var(warn_inline) Warning Warn when an inlined function cannot be inlined 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 Var(warn_missing_noreturn) Warning Warn about functions which might be candidates for __attribute__((noreturn)) Wmudflap Common Var(warn_mudflap) Init(1) Warning Warn about constructs not instrumented by -fmudflap Woverflow Common Var(warn_overflow) Init(1) Warning Warn about overflow in arithmetic expressions 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 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) Init(-1) 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) 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 Wswitch-default Common Var(warn_switch_default) Warning Warn about enumerated switches missing a \"default:\" statement Wswitch-enum Common Var(warn_switch_enum) Warning Warn about all enumerated switches missing a specific case 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) 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) Init(-1) Warning Warn about uninitialized automatic variables Wmaybe-uninitialized Common Var(warn_maybe_uninitialized) Warning 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) 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 Wunused-label Common Var(warn_unused_label) Init(-1) Warning Warn when a label is unused Wunused-parameter Common Var(warn_unused_parameter) Init(-1) Warning Warn when a function parameter is unused Wunused-value Common Var(warn_unused_value) Init(-1) Warning Warn when an expression value is unused Wunused-variable Common Var(warn_unused_variable) Init(-1) Warning 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 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. ; First selectable in G++ 4.7. ; ; 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) 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. 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) Init(1) 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. 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(1) 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-null-pointer-checks Common Report Var(flag_delete_null_pointer_checks) Init(1) Optimization Delete useless null pointer checks 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-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 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 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 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 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 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 ; Nonzero means that functions declared `inline' will be treated ; as `static'. Prevents generation of zillions of copies of unused ; static inline functions; instead, `inlines' are written out ; only when actually used. Used in conjunction with -g. Also ; does the right thing with #pragma interface. finline Common Report Var(flag_no_inline,0) Init(0) Pay attention to the \"inline\" keyword finline-small-functions Common Report Var(flag_inline_small_functions) Optimization Integrate simple functions into their callers when code size is known to not growth finline-functions Common Report Var(flag_inline_functions) Optimization Integrate simple functions into their callers finline-functions-called-once Common Report Var(flag_inline_functions_called_once) Optimization Integrate functions called once into their callers finline-limit- Common RejectNegative Joined Alias(finline-limit=) finline-limit= Common RejectNegative Joined UInteger -finline-limit= Limit the size of inlined functions to 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 Report Var(flag_ipa_matrix_reorg) Optimization Perform matrix layout flattening and transposing based on profiling information. 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_MIXED) -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-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 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 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= Use zlib compression level 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 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 ; 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) Init(1) Optimization Move loop invariant computations out of loops fmudflap Common RejectNegative Report Var(flag_mudflap) Add mudflap bounds-checking instrumentation for single-threaded program fmudflapth Common RejectNegative Report Var(flag_mudflap,2) Add mudflap bounds-checking instrumentation for multi-threaded program fmudflapir Common RejectNegative Report Var(flag_mudflap_ignore_reads) Ignore read operations when inserting mudflap instrumentation 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 foptimize-register-move Common Report Var(flag_regmove) Optimization Do the full register move optimization pass 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) Generate position-independent code if possible (large mode) fPIE Common Report Var(flag_pie,2) Generate position-independent code for executables if possible (large mode) fpic Common Report Var(flag_pic,1) Generate position-independent code if possible (small mode) fpie 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--[=] 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 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 Report Var(flag_regmove) Optimization Enables a register move optimization 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 Report Var(flag_zee) Init(0) Eliminate redundant zero extensions on targets that support implicit extensions. fshow-column 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 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-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 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-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-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 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-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 Ignore Does nothing. Preserved for backward compatibility. ftree-sink Common Report Var(flag_tree_sink) Optimization Enable SSA code sinking on trees 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-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) 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 ftree-vectorize 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 ftree-vect-loop-version Common Report Var(flag_tree_vect_loop_version) Init(1) Optimization Enable loop versioning when doing loop vectorization on trees ftree-vectorizer-verbose= Common RejectNegative Joined UInteger -ftree-vectorizer-verbose= Set the verbosity level of the vectorizer 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) 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 Joined UInteger Var(dwarf_version) Init(2) Negative(gstabs) Generate debug information in DWARF v2 (or later) format ggdb Common JoinedOrMissing Generate debug information in default extended format 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(-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 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 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 Var(pedantic) Issue warnings needed for strict compliance to the standard 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-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 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 static-libgo Driver ; Documented for Go, but always accepted by 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.