X-Git-Url: http://git.sourceforge.jp/view?p=pf3gnuchains%2Fgcc-fork.git;a=blobdiff_plain;f=gcc%2Fcommon.opt;h=2196f749b357fa79ef2da0143553dbdb4d60c507;hp=36e52fcaefcc226a395d9c7fcda5d9fa3bfcc61d;hb=46f8e3b0dc1cbb88c7dde984d0f0c2ce8935011d;hpb=e5ce4771220d67c38e87cbefc87f12e83b74c930 diff --git a/gcc/common.opt b/gcc/common.opt index 36e52fcaefc..2196f749b35 100644 --- a/gcc/common.opt +++ b/gcc/common.opt @@ -1,25 +1,25 @@ ; Options for the language- and target-independent parts of the compiler. -; Copyright (C) 2003, 2004, 2005, 2006 Free Software Foundation, Inc. +; Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008 +; 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 2, or (at your option) any later +; 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 COPYING. If not, write to the Free -; Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA -; 02110-1301, USA. +; along with GCC; see the file COPYING3. If not see +; . -; See the GCC internals manual for a description of this file's format. +; 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. @@ -27,12 +27,29 @@ Common Display this information --param -Common Separate ---param = Set parameter to value. See below for a complete list of parameters +-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 @@ -42,11 +59,11 @@ Common Joined Separate UInteger -G Put global and static data smaller than bytes into a special section (on some targets) O -Common JoinedOrMissing +Common JoinedOrMissing Optimization -O Set optimization level to Os -Common +Common Optimization Optimize for space rather than speed W @@ -54,29 +71,33 @@ Common RejectNegative This switch is deprecated; use -Wextra instead Waggregate-return -Common Var(warn_aggregate_return) +Common Var(warn_aggregate_return) Warning Warn about returning structures, unions or arrays -Walways-true -Common Var(warn_always_true) -Warn about comparisons that always evaluate to true +Warray-bounds +Common Var(warn_array_bounds) Warning +Warn if an array is accessed out of bounds Wattributes -Common Var(warn_attributes) Init(1) +Common Var(warn_attributes) Init(1) Warning Warn about inappropriate attribute usage Wcast-align -Common Var(warn_cast_align) +Common Var(warn_cast_align) Warning Warn about pointer casts which increase alignment Wdeprecated-declarations -Common Var(warn_deprecated_decl) Init(1) +Common Var(warn_deprecated_decl) Init(1) Warning Warn about uses of __attribute__((deprecated)) declarations Wdisabled-optimization -Common Var(warn_disabled_optimization) +Common Var(warn_disabled_optimization) Warning Warn when an optimization pass is disabled +Wdisallowed-function-list= +Common RejectNegative Joined Warning +Warn on calls to these functions + Werror Common Var(warnings_are_errors) Treat all warnings as errors @@ -86,108 +107,135 @@ Common Joined Treat specified warning as error Wextra -Common +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) +Common Var(warn_inline) Warning Warn when an inlined function cannot be inlined Wlarger-than- -Common RejectNegative Joined UInteger --Wlarger-than- Warn if an object is larger than bytes +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) +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) +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) +Common Var(warn_packed) Warning Warn when the packed attribute has no effect on struct layout Wpadded -Common Var(warn_padded) +Common Var(warn_padded) Warning Warn when padding is required to align structure members Wshadow -Common Var(warn_shadow) +Common Var(warn_shadow) Warning Warn when one local variable shadows another Wstack-protector -Common Var(warn_stack_protect) +Common Var(warn_stack_protect) Warning Warn when not issuing stack smashing protection for some reason Wstrict-aliasing -Common +Common Warning Warn about code which might break strict aliasing rules Wstrict-aliasing= -Common Joined UInteger +Common Joined UInteger Var(warn_strict_aliasing) Init(-1) Warning Warn about code which might break strict aliasing rules -Wstring-literal-comparison -Common Var(warn_string_literal_comparison) -Warn about comparisons to constant string literals +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) +Common Var(warn_switch) Warning Warn about enumerated switches, with no default, missing a case Wswitch-default -Common Var(warn_switch_default) +Common Var(warn_switch_default) Warning Warn about enumerated switches missing a \"default:\" statement Wswitch-enum -Common Var(warn_switch_enum) +Common Var(warn_switch_enum) Warning Warn about all enumerated switches missing a specific case Wsystem-headers -Common Var(warn_system_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) +Common Var(warn_uninitialized) Warning Warn about uninitialized automatic variables Wunreachable-code -Common Var(warn_notreached) +Common Var(warn_notreached) Warning Warn about code that will never be executed Wunused -Common +Common Warning Enable all -Wunused- warnings Wunused-function -Common Var(warn_unused_function) +Common Var(warn_unused_function) Warning Warn when a function is unused Wunused-label -Common Var(warn_unused_label) +Common Var(warn_unused_label) Warning Warn when a label is unused Wunused-parameter -Common Var(warn_unused_parameter) +Common Var(warn_unused_parameter) Warning Warn when a function parameter is unused Wunused-value -Common Var(warn_unused_value) +Common Var(warn_unused_value) Warning Warn when an expression value is unused Wunused-variable -Common Var(warn_unused_variable) +Common Var(warn_unused_variable) Warning Warn when a variable is unused -Wvolatile-register-var -Common Var(warn_register_var) -Warn when a register variable is declared volatile +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 @@ -219,34 +267,36 @@ Common Separate ; ; 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) +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) +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) +Common Report Var(align_labels,0) Optimization UInteger Align all labels falign-labels= Common RejectNegative Joined UInteger falign-loops -Common Report Var(align_loops) +Common Report Var(align_loops) Optimization UInteger Align the start of loops falign-loops= @@ -257,23 +307,33 @@ Common RejectNegative Joined UInteger ; 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. True in Fortran. +; 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) +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 +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 +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) +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. @@ -283,23 +343,23 @@ 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) +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) +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) +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) +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) +Common Report Var(flag_btr_bb_exclusive) Optimization Restrict target load migration not to re-use registers in any basic block fcall-saved- @@ -314,49 +374,69 @@ Common Joined RejectNegative ; 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) +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) +Common Report Var(flag_no_common,0) Optimization Do not put uninitialized globals in the common section fcprop-registers -Common Report Var(flag_cprop_registers) +Common Report Var(flag_cprop_registers) Optimization Perform a register copy-propagation optimization pass fcrossjumping -Common Report Var(flag_crossjumping) +Common Report Var(flag_crossjumping) Optimization Perform cross-jumping optimization fcse-follow-jumps -Common Report Var(flag_cse_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) +Common Report Var(flag_cse_skip_blocks) Optimization When running CSE, follow conditional jumps fcx-limited-range -Common Report Var(flag_cx_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) +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) +Common Report Var(flag_defer_pop) Optimization Defer popping functions args from stack until later fdelayed-branch -Common Report Var(flag_delayed_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) +Common Report Var(flag_delete_null_pointer_checks) Optimization Delete useless null pointer checks fdiagnostics-show-location= @@ -371,12 +451,16 @@ 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 and line number notes in debugging dumps +Suppress output of instruction numbers, line number notes and addresses in debugging dumps fearly-inlining -Common Report Var(flag_early_inlining) Init(1) +Common Report Var(flag_early_inlining) Init(1) Optimization Perform early inlining feliminate-dwarf2-dups @@ -391,19 +475,23 @@ 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) +Common Report Var(flag_exceptions) Optimization Enable exception handling fexpensive-optimizations -Common Report Var(flag_expensive_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) +Common Report Var(flag_finite_math_only) Optimization Assume no NaNs or infinities are generated ffixed- @@ -411,20 +499,16 @@ Common Joined RejectNegative -ffixed- Mark as being unavailable to the compiler ffloat-store -Common Report Var(flag_float_store) +Common Report Var(flag_float_store) Optimization Don't allocate floats and doubles in extended-precision registers -; Nonzero for -fforce-addr: load memory address into a register before -; reference to memory. This makes better cse but slower compilation. fforce-addr -Common Report Var(flag_force_addr) -Copy memory address constants into registers before use +Common +Does nothing. Preserved for backward compatibility. -; Nonzero for -fforce-mem: load memory value into a register -; before arithmetic on it. This makes better cse but slower compilation. -fforce-mem -Common Report Var(flag_force_mem) -Copy memory operands into registers before use +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 @@ -438,29 +522,29 @@ Common Report Var(flag_function_sections) Place each function into its own section fgcse -Common Report Var(flag_gcse) +Common Report Var(flag_gcse) Optimization Perform global common subexpression elimination fgcse-lm -Common Report Var(flag_gcse_lm) Init(1) +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) +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) +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) +Common Report Var(flag_gcse_after_reload) Optimization Perform global common subexpression elimination after register allocation has finished fguess-branch-probability -Common Report Var(flag_guess_branch_prob) +Common Report Var(flag_guess_branch_prob) Optimization Enable guessing of branch probabilities ; Nonzero means ignore `#ident' directives. 0 means handle them. @@ -472,11 +556,11 @@ Common Report Var(flag_no_ident,0) Process #ident directives fif-conversion -Common Report Var(flag_if_conversion) +Common Report Var(flag_if_conversion) Optimization Perform conversion of conditional jumps to branchless equivalents fif-conversion2 -Common Report Var(flag_if_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. @@ -496,12 +580,16 @@ finline Common Report Var(flag_no_inline,0) Init(2) 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) +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) +Common Report Var(flag_inline_functions_called_once) Init(1) Optimization Integrate functions called once into their callers finline-limit- @@ -515,32 +603,50 @@ 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) +Common Report Var(flag_ipa_cp) Optimization Perform Interprocedural constant propagation fipa-pure-const -Common Report Var(flag_ipa_pure_const) Init(0) +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) +Common Report Var(flag_ipa_pta) Init(0) Optimization Perform interprocedural points-to analysis fipa-reference -Common Report Var(flag_ipa_reference) Init(0) +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) +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. + fivopts -Common Report Var(flag_ivopts) Init(1) +Common Report Var(flag_ivopts) Init(1) Optimization Optimize induction variables on trees fjump-tables -Common Var(flag_jump_tables) Init(1) +Common Var(flag_jump_tables) Init(1) Optimization Use jump tables for sufficiently large switch statements fkeep-inline-functions @@ -556,11 +662,11 @@ Common Report Var(flag_leading_underscore) Init(-1) Give external symbols a leading underscore floop-optimize -Common Report Var(flag_loop_optimize) -Perform loop optimizations +Common +Does nothing. Preserved for backward compatibility. fmath-errno -Common Report Var(flag_errno_math) Init(1) +Common Report Var(flag_errno_math) Init(1) Optimization Set errno after built-in math functions fmem-report @@ -571,23 +677,31 @@ Report on permanent memory allocation ; string constants and constants from constant pool, if 2 also constant ; variables. fmerge-all-constants -Common Report Var(flag_merge_constants,2) Init(1) +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 +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) +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) +Common Report Var(flag_move_loop_invariants) Init(1) Optimization Move loop invariant computations out of loops fmudflap @@ -595,39 +709,55 @@ Common RejectNegative Report Var(flag_mudflap) Add mudflap bounds-checking instrumentation for single-threaded program fmudflapth -Common RejectNegative Report Var(flag_mudflap_threads) +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) +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) +Common Report Var(flag_non_call_exceptions) Optimization Support synchronous non-call exceptions fomit-frame-pointer -Common Report Var(flag_omit_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) +Common Report Var(flag_regmove) Optimization Do the full register move optimization pass foptimize-sibling-calls -Common Report Var(flag_optimize_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) +Common Report Var(flag_pack_struct) Optimization Pack structure members together without holes fpack-struct= -Common RejectNegative Joined UInteger +Common RejectNegative Joined UInteger Optimization -fpack-struct= Set initial maximum structure member alignment fpcc-struct-return @@ -635,15 +765,15 @@ Common Report Var(flag_pcc_struct_return,1) VarExists Return small aggregates in memory, not registers fpeel-loops -Common Report Var(flag_peel_loops) +Common Report Var(flag_peel_loops) Optimization Perform loop peeling fpeephole -Common Report Var(flag_no_peephole,0) +Common Report Var(flag_no_peephole,0) Optimization Enable machine specific peephole optimizations fpeephole2 -Common Report Var(flag_peephole2) +Common Report Var(flag_peephole2) Optimization Enable an RTL peephole pass before sched2 fPIC @@ -662,12 +792,12 @@ fpie Common Report Var(flag_pie,1) VarExists Generate position-independent code for executables if possible (small mode) -fprefetch-loop-arrays -Common Report Var(flag_prefetch_loop_arrays,1) -Generate prefetch instructions, if available, for arrays in loops +fpredictive-commoning +Common Report Var(flag_predictive_commoning) Optimization +Run predictive commoning optimization. -fprefetch-loop-arrays-rtl -Common Report Var(flag_prefetch_loop_arrays,2) +fprefetch-loop-arrays +Common Report Var(flag_prefetch_loop_arrays) Optimization Generate prefetch instructions, if available, for arrays in loops fprofile @@ -678,14 +808,27 @@ 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-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 +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 @@ -697,56 +840,66 @@ 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 +Common Report Var(flag_pcc_struct_return,0) VarExists Optimization Return small aggregates in registers fregmove -Common Report Var(flag_regmove) +Common Report Var(flag_regmove) Optimization Enables a register move optimization frename-registers -Common Report Var(flag_rename_registers) Init(2) +Common Report Var(flag_rename_registers) Init(2) Optimization Perform a register renaming optimization pass freorder-blocks -Common Report Var(flag_reorder_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) +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) +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) +Common Report Var(flag_rerun_cse_after_loop) Init(2) Optimization Add a common subexpression elimination pass after loop optimizations frerun-loop-opt -Common Report Var(flag_rerun_loop_opt) -Run the loop optimizer twice +Common +Does nothing. Preserved for backward compatibility. frounding-math -Common Report Var(flag_rounding_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) +Common Report Var(flag_schedule_interblock) Init(1) Optimization Enable scheduling across basic blocks fsched-spec -Common Report Var(flag_schedule_speculative) Init(1) +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) +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) +Common Report Var(flag_schedule_speculative_load_dangerous) Optimization Allow speculative motion of more loads fsched-verbose= @@ -754,29 +907,29 @@ Common RejectNegative Joined -fsched-verbose= Set the verbosity level of the scheduler fsched2-use-superblocks -Common Report Var(flag_sched2_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) +Common Report Var(flag_sched2_use_traces) Optimization If scheduling post reload, do trace scheduling fschedule-insns -Common Report Var(flag_schedule_insns) +Common Report Var(flag_schedule_insns) Optimization Reschedule instructions before register allocation fschedule-insns2 -Common Report Var(flag_schedule_insns_after_reload) +Common Report Var(flag_schedule_insns_after_reload) Optimization Reschedule instructions after register allocation ; 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) +Common Report Var(flag_sched_stalled_insns) Optimization UInteger Allow premature scheduling of queued insns fsched-stalled-insns= -Common RejectNegative Joined UInteger +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 @@ -784,7 +937,7 @@ Common RejectNegative Joined UInteger ; 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) +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= @@ -792,31 +945,43 @@ 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) +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) +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(1) -Show column numbers in diagnostics, when available. Default on +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) +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) +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) +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) +Common Report Var(flag_variable_expansion_in_unroller) Optimization Apply variable expansion when loops are unrolled ; Emit code to probe the stack, to help detect stack overflow; also @@ -845,17 +1010,21 @@ Common Report RejectNegative Var(flag_stack_protect, 2) VarExists Use a stack protection method for every function fstrength-reduce -Common Report Var(flag_strength_reduce) -Perform strength reduction optimizations +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) +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 @@ -865,7 +1034,7 @@ Common Report Var(flag_test_coverage) Create data files needed by \"gcov\" fthread-jumps -Common Report Var(flag_thread_jumps) +Common Report Var(flag_thread_jumps) Optimization Perform jump threading optimizations ftime-report @@ -877,7 +1046,7 @@ 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(1) +Common Report Var(flag_toplevel_reorder) Init(2) Optimization Reorder top level functions, variables, and asms ftracer @@ -888,152 +1057,189 @@ Perform superblock formation via tail duplication ; (user-visible) trap. This is the case, for example, in nonstop ; IEEE 754 arithmetic. ftrapping-math -Common Report Var(flag_trapping_math) Init(1) +Common Report Var(flag_trapping_math) Init(1) Optimization Assume floating-point operations can trap ftrapv -Common Report Var(flag_trapv) +Common Report Var(flag_trapv) Optimization Trap for signed overflow in addition, subtraction and multiplication ftree-ccp -Common Report Var(flag_tree_ccp) +Common Report Var(flag_tree_ccp) Optimization Enable SSA-CCP optimization on trees ftree-store-ccp -Common Report Var(flag_tree_store_ccp) +Common Report Var(flag_tree_store_ccp) Optimization Enable SSA-CCP optimization for stores and loads ftree-ch -Common Report Var(flag_tree_ch) +Common Report Var(flag_tree_ch) Optimization Enable loop header copying on trees -ftree-combine-temps -Common Report Var(flag_tree_combine_temps) -Coalesce memory temporaries in the SSA->normal pass - ftree-copyrename -Common Report Var(flag_tree_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) +Common Report Var(flag_tree_copy_prop) Optimization Enable copy propagation on trees ftree-store-copy-prop -Common Report Var(flag_tree_store_copy_prop) -Enable copy propagation for stores and loads +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) +Common Report Var(flag_tree_dce) Optimization Enable SSA dead code elimination optimization on trees ftree-dominator-opts -Common Report Var(flag_tree_dom) +Common Report Var(flag_tree_dom) Optimization Enable dominator optimizations ftree-dse -Common Report Var(flag_tree_dse) +Common Report Var(flag_tree_dse) Optimization Enable dead store elimination ftree-fre -Common Report Var(flag_tree_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) +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) +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) +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) +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) +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 Report Var(flag_tree_salias) -Perform structural alias analysis +Common +Does nothing. Preserved for backward compatibility. ftree-sink -Common Report Var(flag_tree_sink) +Common Report Var(flag_tree_sink) Optimization Enable SSA code sinking on trees ftree-sra -Common Report Var(flag_tree_sra) +Common Report Var(flag_tree_sra) Optimization Perform scalar replacement of aggregates ftree-ter -Common Report Var(flag_tree_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) +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) +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) +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) +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) +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) +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) +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) +Common Report Var(flag_unswitch_loops) Optimization Perform loop unswitching funwind-tables -Common Report Var(flag_unwind_tables) +Common Report Var(flag_unwind_tables) Optimization Just generate unwind tables for exception handling fvar-tracking -Common Report Var(flag_var_tracking) VarExists +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) +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) +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 @@ -1050,19 +1256,23 @@ Common Joined RejectNegative fvpt -Common Report Var(flag_value_profile_transformations) +Common Report Var(flag_value_profile_transformations) Optimization Use expression value profiles in optimizations fweb -Common Report Var(flag_web) Init(2) +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) +Common Report Var(flag_whole_program) Init(0) Optimization Perform whole program optimizations fwrapv -Common Report Var(flag_wrapv) +Common Report Var(flag_wrapv) Optimization Assume signed arithmetic overflow wraps around fzero-initialized-in-bss @@ -1074,11 +1284,11 @@ Common JoinedOrMissing Generate debug information in default format gcoff -Common JoinedOrMissing +Common JoinedOrMissing Negative(gdwarf-2) Generate debug information in COFF format gdwarf-2 -Common JoinedOrMissing +Common JoinedOrMissing Negative(gstabs) Generate debug information in DWARF v2 format ggdb @@ -1086,23 +1296,23 @@ Common JoinedOrMissing Generate debug information in default extended format gstabs -Common JoinedOrMissing +Common JoinedOrMissing Negative(gstabs+) Generate debug information in STABS format gstabs+ -Common JoinedOrMissing +Common JoinedOrMissing Negative(gvms) Generate debug information in extended STABS format gvms -Common JoinedOrMissing +Common JoinedOrMissing Negative(gxcoff) Generate debug information in VMS format gxcoff -Common JoinedOrMissing +Common JoinedOrMissing Negative(gxcoff+) Generate debug information in XCOFF format gxcoff+ -Common JoinedOrMissing +Common JoinedOrMissing Negative(gcoff) Generate debug information in extended XCOFF format o @@ -1133,4 +1343,12 @@ 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.