X-Git-Url: https://oss.titaniummirror.com/gitweb/?a=blobdiff_plain;f=gcc%2Fcommon.opt;fp=gcc%2Fcommon.opt;h=023d773586a83e6b9437655ac68e8848094a838b;hb=6fed43773c9b0ce596dca5686f37ac3fc0fa11c0;hp=0000000000000000000000000000000000000000;hpb=27b11d56b743098deb193d510b337ba22dc52e5c;p=msp430-gcc.git diff --git a/gcc/common.opt b/gcc/common.opt new file mode 100644 index 00000000..023d7735 --- /dev/null +++ b/gcc/common.opt @@ -0,0 +1,1441 @@ +; Options for the language- and target-independent parts of the compiler. + +; Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009 +; 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. + +-help +Common +Display this information + +-help= +Common Report Joined +--help= Display descriptions of a specific class of options. is one or more of optimizers, target, warnings, undocumented, params + +-target-help +Common +Alias for --help=target + +;; The following three entries are to work around the gcc driver +;; program's insatiable desire to turn options starting with a +;; double dash (--) into options starting with a dash f (-f). +fhelp +Common + +fhelp= +Common Joined + +ftarget-help +Common + +-param +Common Separate +--param = Set parameter to value. See below for a complete list of parameters + +-version +Common + +G +Common Joined Separate UInteger +-G Put global and static data smaller than bytes into a special section (on some targets) + +O +Common JoinedOrMissing Optimization +-O Set optimization level to + +Os +Common Optimization +Optimize for space rather than speed + +W +Common RejectNegative +This switch is deprecated; use -Wextra instead + +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 + +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 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 UInteger Warning + +Wlarger-than= +Common RejectNegative Joined UInteger Warning +-Wlarger-than= Warn if an object is larger than bytes + +Wlogical-op +Common Warning Var(warn_logical_op) +Warn when a logical operator is suspicously always evaluating to true or false + +Wunsafe-loop-optimizations +Common Var(warn_unsafe_loop_optimizations) Warning +Warn if the loop cannot be optimized due to nontrivial assumptions. + +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 + +Wstrict-aliasing +Common Warning +Warn about code which might break strict aliasing rules + +Wstrict-aliasing= +Common Joined 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 UInteger Var(warn_strict_overflow) Init(-1) Warning +Warn about optimizations that assume that signed overflow is undefined + +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 + +Wtype-limits +Common Var(warn_type_limits) Init(-1) Warning +Warn if a comparison is always true or always false due to the limited range of the data type + +Wuninitialized +Common Var(warn_uninitialized) Warning +Warn about uninitialized automatic variables + +Wunreachable-code +Common Var(warn_notreached) Warning +Warn about code that will never be executed + +Wunused +Common Var(warn_unused) Init(0) Warning +Enable all -Wunused- warnings + +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 RejectNegative Var(warn_coverage_mismatch) Warning +Warn instead of error in case profiles in -fprofile-use do not match + +aux-info +Common Separate +-aux-info Emit declaration information into + +aux-info= +Common Joined + +auxbase +Common Separate + +auxbase-strip +Common Separate + +d +Common Joined +-d Enable dumps from specific passes of the compiler + +dumpbase +Common Separate +-dumpbase Set the file basename to be used for dumps + +; 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. +; +; Additional positive integers will be assigned as new versions of +; the ABI become the default version of the ABI. +fabi-version= +Common Joined UInteger Var(flag_abi_version) Init(2) + +falign-functions +Common Report Var(align_functions,0) Optimization UInteger +Align the start of functions + +falign-functions= +Common RejectNegative Joined UInteger + +falign-jumps +Common Report Var(align_jumps,0) Optimization UInteger +Align labels which are only reached by jumping + +falign-jumps= +Common RejectNegative Joined UInteger + +falign-labels +Common Report Var(align_labels,0) Optimization UInteger +Align all labels + +falign-labels= +Common RejectNegative Joined UInteger + +falign-loops +Common Report Var(align_loops) Optimization UInteger +Align the start of loops + +falign-loops= +Common RejectNegative Joined UInteger + +; This flag is only tested if alias checking is enabled. +; 0 if pointer arguments may alias each other. True in C. +; 1 if pointer arguments may not alias each other but may alias +; global variables. +; 2 if pointer arguments may not alias each other and may not +; alias global variables. +; 3 if pointer arguments may not alias anything. True in Fortran. +; Set by the front end. +fargument-alias +Common Report Var(flag_argument_noalias,0) Optimization +Specify that arguments may alias each other and globals + +fargument-noalias +Common Report Var(flag_argument_noalias,1) VarExists Optimization +Assume arguments may alias globals but not each other + +fargument-noalias-global +Common Report Var(flag_argument_noalias,2) VarExists Optimization +Assume arguments alias neither each other nor globals + +fargument-noalias-anything +Common Report Var(flag_argument_noalias,3) VarExists Optimization +Assume arguments alias no other storage + +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 +-fcall-saved- Mark as being preserved across functions + +fcall-used- +Common Joined RejectNegative +-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. + +fcommon +Common Report Var(flag_no_common,0) Optimization +Do not put uninitialized globals in the common section + +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 Report Var(flag_cse_skip_blocks) Optimization +When running CSE, follow conditional jumps + +fcx-limited-range +Common Report Var(flag_cx_limited_range) Optimization +Omit range reduction step when performing complex division + +fcx-fortran-rules +Common Report Var(flag_cx_fortran_rules) Optimization +Complex multiplication and division follow Fortran rules + +fdata-sections +Common Report Var(flag_data_sections) Optimization +Place data items into their own section + +fdbg-cnt-list +Common Report +List all available debugging counters with their limits and counts. + +fdbg-cnt= +Common RejectNegative Joined +-fdbg-cnt=:[,:,...] Set the debug counter limit. + +fdebug-prefix-map= +Common Joined RejectNegative +Map one directory name to another in debug information + +; 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) Optimization +Delete useless null pointer checks + +fdiagnostics-show-location= +Common Joined RejectNegative +-fdiagnostics-show-location=[once|every-line] How often to emit source location at the beginning of line-wrapped diagnostics + +fdiagnostics-show-option +Common +Amend appropriate diagnostic messages with the command line option that controls them + +fdump- +Common Joined RejectNegative +-fdump- Dump various compiler internals to a file + +fdump-noaddr +Common Report Var(flag_dump_noaddr) +Suppress output of addresses in debugging dumps + +fdump-unnumbered +Common Report Var(flag_dump_unnumbered) VarExists +Suppress output of instruction numbers, line number notes and addresses 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 + +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 + +ffast-math +Common + +ffinite-math-only +Common Report Var(flag_finite_math_only) Optimization +Assume no NaNs or infinities are generated + +ffixed- +Common Joined RejectNegative +-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 +Does nothing. Preserved for backward compatibility. + +fforward-propagate +Common Report Var(flag_forward_propagate) Optimization +Perform a forward propagation pass on RTL + +; 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 + +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 + +; This option is not documented as it does not perform any useful optimization. +fgraphite-identity +Common Report Var(flag_graphite_identity) Optimization +Enable Graphite Identity transformation + +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 + +; -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) Init(1) Optimization +Integrate functions called once into their callers + +finline-limit- +Common RejectNegative Joined UInteger + +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-pure-const +Common Report Var(flag_ipa_pure_const) Init(0) Optimization +Discover pure and const functions + +fipa-pta +Common Report Var(flag_ipa_pta) Init(0) Optimization +Perform interprocedural points-to analysis + +fipa-reference +Common Report Var(flag_ipa_reference) Init(0) Optimization +Discover readonly and non addressable static variables + +fipa-type-escape +Common Report Var(flag_ipa_type_escape) Init(0) Optimization +Type based escape and alias analysis + +fipa-matrix-reorg +Common Report Var(flag_ipa_matrix_reorg) Optimization +Perform matrix layout flattening and transposing based +on profiling information. + +fipa-struct-reorg +Common Report Var(flag_ipa_struct_reorg) +Perform structure layout optimizations based +on profiling information. + +fira-algorithm= +Common Joined RejectNegative +-fira-algorithm=[CB|priority] Set the used IRA algorithm + +fira-region= +Common Joined RejectNegative +-fira-region=[one|all|mixed] Set regions for IRA + +fira-coalesce +Common Report Var(flag_ira_coalesce) Init(0) +Do optimistic coalescing. + +fira-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 +-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 +Does nothing. Preserved for backward compatibility. + +fmath-errno +Common Report Var(flag_errno_math) Init(1) Optimization +Set errno after built-in math functions + +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) VarExists 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 VarExists 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 + +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) VarExists +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) VarExists +Generate position-independent code if possible (small mode) + +fpie +Common Report Var(flag_pie,1) VarExists +Generate position-independent code for executables if possible (small mode) + +fpredictive-commoning +Common Report Var(flag_predictive_commoning) Optimization +Run predictive commoning optimization. + +fprefetch-loop-arrays +Common Report Var(flag_prefetch_loop_arrays) 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 +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 + +frandom-seed= +Common Joined RejectNegative +-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) VarExists 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) Init(2) Optimization +Add a common subexpression elimination pass after loop optimizations + +frerun-loop-opt +Common +Does nothing. Preserved for backward compatibility. + +frounding-math +Common Report Var(flag_rounding_math) Optimization +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-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 +-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 Report Var(flag_sched2_use_traces) Optimization +If scheduling post reload, do trace scheduling + +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 + +fsection-anchors +Common Report Var(flag_section_anchors) Optimization +Access data in the same section from shared anchor points + +frtl-abstract-sequences +Common Report Var(flag_rtl_seqabstr) Optimization +Perform sequence abstraction optimization on RTL + +fsee +Common Report Var(flag_see) Init(0) +Eliminate redundant sign extensions using LCM. + +fshow-column +Common C ObjC C++ ObjC++ Report Var(flag_show_column) Init(0) +Show column numbers in diagnostics, when available. Default off + +fsignaling-nans +Common Report Var(flag_signaling_nans) Optimization +Disable optimizations observable by IEEE signaling NaNs + +fsigned-zeros +Common Report Var(flag_signed_zeros) Init(1) Optimization +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-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 Report +Insert stack checking code into the program. Same as -fstack-check=specific + +fstack-limit +Common + +fstack-limit-register= +Common RejectNegative Joined +-fstack-limit-register= Trap if the stack goes past + +fstack-limit-symbol= +Common RejectNegative Joined +-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) VarExists +Use a stack protection method for every function + +fstrength-reduce +Common +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 +-ftls-model=[global-dynamic|local-dynamic|initial-exec|local-exec] Set the default thread-local storage code generation model + +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 +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-store-ccp +Common +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 +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-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-im +Common Report Var(flag_tree_loop_im) Init(1) Optimization +Enable loop invariant motion on trees + +ftree-loop-linear +Common Report Var(flag_tree_loop_linear) Optimization +Enable linear loop transforms on trees + +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 UInteger Var(flag_tree_parallelize_loops) Init(1) +Enable automatic parallelization of loops + +ftree-pre +Common Report Var(flag_tree_pre) Optimization +Enable SSA-PRE optimization on trees + +ftree-reassoc +Common Report Var(flag_tree_reassoc) Init(1) Optimization +Enable reassociation on tree level + +ftree-salias +Common +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) Init(1) 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) +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) +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 +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 + +fvar-tracking +Common Report Var(flag_var_tracking) VarExists Optimization +Perform variable 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 loop vectorization 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 +-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 +-fvisibility=[default|internal|hidden|protected] Set the default symbol visibility + + +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-2) +Generate debug information in COFF format + +gdwarf-2 +Common JoinedOrMissing Negative(gstabs) +Generate debug information in DWARF v2 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 + +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 + +o +Common Joined Separate +-o Place output into + +p +Common Var(profile_flag) +Enable function profiling + +pedantic +Common Var(pedantic) +Issue warnings needed for strict compliance to the standard + +pedantic-errors +Common +Like -pedantic but issue them as errors + +quiet +Common Var(quiet_flag) +Do not display functions compiled or elapsed time + +version +Common Var(version_flag) +Display the compiler's version + +w +Common Var(inhibit_warnings) +Suppress warnings + +shared +Common RejectNegative Negative(pie) +Create a shared library + +pie +Common RejectNegative Negative(shared) +Create a position independent executable + +; This comment is to ensure we retain the blank line above.