diff options
author | kan <kan@FreeBSD.org> | 2007-05-19 01:19:51 +0000 |
---|---|---|
committer | kan <kan@FreeBSD.org> | 2007-05-19 01:19:51 +0000 |
commit | 1f9ea4d0a40cca64d60cf4dab152349da7b9dddf (patch) | |
tree | 0cb530c9c38af219e6dda2994c078b6b2b9ad853 /contrib/gcc/common.opt | |
parent | 4895159b2b4f648051c1f139faa7b6dc50c2bfcb (diff) | |
download | FreeBSD-src-1f9ea4d0a40cca64d60cf4dab152349da7b9dddf.zip FreeBSD-src-1f9ea4d0a40cca64d60cf4dab152349da7b9dddf.tar.gz |
GCC 4.2.0 release.
Diffstat (limited to 'contrib/gcc/common.opt')
-rw-r--r-- | contrib/gcc/common.opt | 736 |
1 files changed, 543 insertions, 193 deletions
diff --git a/contrib/gcc/common.opt b/contrib/gcc/common.opt index 20d1b75..23da331 100644 --- a/contrib/gcc/common.opt +++ b/contrib/gcc/common.opt @@ -1,5 +1,6 @@ ; Options for the language- and target-independent parts of the compiler. -; Copyright (C) 2003 Free Software Foundation, Inc. + +; Copyright (C) 2003, 2004, 2005, 2006 Free Software Foundation, Inc. ; ; This file is part of GCC. ; @@ -7,18 +8,18 @@ ; the terms of the GNU General Public License as published by the Free ; Software Foundation; either version 2, 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, 59 Temple Place - Suite 330, Boston, MA -; 02111-1307, USA. +; Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA +; 02110-1301, USA. -; See c.opt for a description of this file's format. +; See the GCC internals manual for a description of this file's format. ; Please try to keep this file in ASCII collating order. @@ -53,79 +54,115 @@ Common RejectNegative This switch is deprecated; use -Wextra instead Waggregate-return -Common +Common Var(warn_aggregate_return) Warn about returning structures, unions or arrays +Wattributes +Common Var(warn_attributes) Init(1) +Warn about inappropriate attribute usage + Wcast-align -Common +Common Var(warn_cast_align) Warn about pointer casts which increase alignment Wdeprecated-declarations -Common +Common Var(warn_deprecated_decl) Init(1) Warn about uses of __attribute__((deprecated)) declarations Wdisabled-optimization -Common +Common Var(warn_disabled_optimization) Warn when an optimization pass is disabled Werror -Common +Common Var(warnings_are_errors) Treat all warnings as errors +Werror= +Common Joined +Treat specified warning as error + Wextra Common Print extra (possibly unwanted) warnings +Wfatal-errors +Common Var(flag_fatal_errors) +Exit on the first error occurred + Winline -Common +Common Var(warn_inline) Warn when an inlined function cannot be inlined Wlarger-than- Common RejectNegative Joined UInteger -Wlarger-than-<number> Warn if an object is larger than <number> bytes +Wunsafe-loop-optimizations +Common Var(warn_unsafe_loop_optimizations) +Warn if the loop cannot be optimized due to nontrivial assumptions. + Wmissing-noreturn -Common +Common Var(warn_missing_noreturn) Warn about functions which might be candidates for __attribute__((noreturn)) +Woverflow +Common Var(warn_overflow) Init(1) +Warn about overflow in arithmetic expressions + Wpacked -Common +Common Var(warn_packed) Warn when the packed attribute has no effect on struct layout Wpadded -Common +Common Var(warn_padded) Warn when padding is required to align structure members Wshadow -Common +Common Var(warn_shadow) Warn when one local variable shadows another +Wstack-protector +Common Var(warn_stack_protect) +Warn when not issuing stack smashing protection for some reason + Wstrict-aliasing Common Warn about code which might break strict aliasing rules -Wswitch +Wstrict-aliasing= +Common Joined UInteger +Warn about code which might break strict aliasing rules + +Wstrict-overflow Common +Warn about optimizations that assume that signed overflow is undefined + +Wstrict-overflow= +Common Joined UInteger +Warn about optimizations that assume that signed overflow is undefined + +Wswitch +Common Var(warn_switch) Warn about enumerated switches, with no default, missing a case Wswitch-default -Common +Common Var(warn_switch_default) Warn about enumerated switches missing a \"default:\" statement Wswitch-enum -Common +Common Var(warn_switch_enum) Warn about all enumerated switches missing a specific case Wsystem-headers -Common +Common Var(warn_system_headers) Do not suppress warnings from system headers Wuninitialized -Common +Common Var(warn_uninitialized) Warn about uninitialized automatic variables Wunreachable-code -Common +Common Var(warn_notreached) Warn about code that will never be executed Wunused @@ -133,25 +170,29 @@ Common Enable all -Wunused- warnings Wunused-function -Common +Common Var(warn_unused_function) Warn when a function is unused Wunused-label -Common +Common Var(warn_unused_label) Warn when a label is unused Wunused-parameter -Common +Common Var(warn_unused_parameter) Warn when a function parameter is unused Wunused-value -Common +Common Var(warn_unused_value) Warn when an expression value is unused Wunused-variable -Common +Common Var(warn_unused_variable) Warn when a variable is unused +Wvolatile-register-var +Common Var(warn_register_var) +Warn when a register variable is declared volatile + aux-info Common Separate -aux-info <file> Emit declaration information into <file> @@ -173,79 +214,104 @@ dumpbase Common Separate -dumpbase <file> Set the file basename to be used for dumps -fPIC -Common - -fPIE -Common - +; 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. +; +; Additional positive integers will be assigned as new versions of +; the ABI become the default version of the ABI. fabi-version= -Common Joined UInteger +Common Joined UInteger Var(flag_abi_version) Init(2) falign-functions -Common +Common Report Var(align_functions,0) Align the start of functions falign-functions= Common RejectNegative Joined UInteger falign-jumps -Common +Common Report Var(align_jumps,0) Align labels which are only reached by jumping falign-jumps= Common RejectNegative Joined UInteger falign-labels -Common +Common Report Var(align_labels,0) Align all labels falign-labels= Common RejectNegative Joined UInteger falign-loops -Common +Common Report Var(align_loops) 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 +Common Report Var(flag_argument_noalias,0) Specify that arguments may alias each other and globals fargument-noalias -Common +Common Report Var(flag_argument_noalias,1) VarExists Assume arguments may alias globals but not each other fargument-noalias-global -Common +Common Report Var(flag_argument_noalias,2) VarExists Assume arguments alias neither each other nor globals +fargument-noalias-anything +Common Report Var(flag_argument_noalias,3) VarExists +Assume arguments alias no other storage + fasynchronous-unwind-tables -Common +Common Report Var(flag_asynchronous_unwind_tables) Generate unwind tables that are exact at each instruction boundary +; -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 +Common Report Var(flag_bounds_check) Generate code to check bounds before indexing arrays fbranch-count-reg -Common +Common Report Var(flag_branch_on_count_reg) Init(1) Replace add, compare, branch with branch on count register fbranch-probabilities -Common +Common Report Var(flag_branch_probabilities) Use profiling information for branch probabilities fbranch-target-load-optimize -Common +Common Report Var(flag_branch_target_load_optimize) Perform branch target load optimization before prologue / epilogue threading fbranch-target-load-optimize2 -Common +Common Report Var(flag_branch_target_load_optimize2) Perform branch target load optimization after prologue / epilogue threading +fbtr-bb-exclusive +Common Report Var(flag_btr_bb_exclusive) +Restrict target load migration not to re-use registers in any basic block + fcall-saved- Common Joined RejectNegative -fcall-saved-<register> Mark <register> as being preserved across functions @@ -254,79 +320,108 @@ fcall-used- Common Joined RejectNegative -fcall-used-<register> Mark <register> 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 +Common Report Var(flag_caller_saves) Save registers around function calls fcommon -Common +Common Report Var(flag_no_common,0) Do not put uninitialized globals in the common section fcprop-registers -Common +Common Report Var(flag_cprop_registers) Perform a register copy-propagation optimization pass fcrossjumping -Common +Common Report Var(flag_crossjumping) Perform cross-jumping optimization fcse-follow-jumps -Common +Common Report Var(flag_cse_follow_jumps) When running CSE, follow jumps to their targets fcse-skip-blocks -Common +Common Report Var(flag_cse_skip_blocks) When running CSE, follow conditional jumps +fcx-limited-range +Common Report Var(flag_cx_limited_range) +Omit range reduction step when performing complex division + fdata-sections -Common +Common Report Var(flag_data_sections) Place data items into their own section +; 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 +Common Report Var(flag_defer_pop) Defer popping functions args from stack until later fdelayed-branch -Common +Common Report Var(flag_delayed_branch) Attempt to fill delay slots of branch instructions fdelete-null-pointer-checks -Common +Common Report Var(flag_delete_null_pointer_checks) 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 -fdump-unnumbered +fdiagnostics-show-option Common -Suppress output of instruction numbers and line number notes in debugging dumps +Amend appropriate diagnostic messages with the command line option that controls them + +fdump- +Common Joined RejectNegative +-fdump-<type> 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 + +fearly-inlining +Common Report Var(flag_early_inlining) Init(1) +Perform early inlining feliminate-dwarf2-dups -Common +Common Report Var(flag_eliminate_dwarf2_dups) Perform DWARF2 duplicate elimination feliminate-unused-debug-symbols -Common +Common Report Var(flag_debug_only_used_symbols) Perform unused type elimination in debug info feliminate-unused-debug-types -Common +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(1) +Do not suppress C++ class debug information. + fexceptions -Common +Common Report Var(flag_exceptions) Enable exception handling fexpensive-optimizations -Common +Common Report Var(flag_expensive_optimizations) Perform a number of minor, expensive optimizations ffast-math Common ffinite-math-only -Common +Common Report Var(flag_finite_math_only) Assume no NaNs or infinities are generated ffixed- @@ -334,69 +429,99 @@ Common Joined RejectNegative -ffixed-<register> Mark <register> as being unavailable to the compiler ffloat-store -Common -Do not store floats in registers +Common Report Var(flag_float_store) +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 +Common Report Var(flag_force_addr) Copy memory address constants into registers before use +; Nonzero for -fforce-mem: load memory value into a register +; before arithmetic on it. This makes better cse but slower compilation. fforce-mem -Common +Common Report Var(flag_force_mem) Copy memory operands into registers before use +; 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 +Common Report Var(flag_no_function_cse,0) Allow function addresses to be held in registers ffunction-sections -Common +Common Report Var(flag_function_sections) Place each function into its own section fgcse -Common +Common Report Var(flag_gcse) Perform global common subexpression elimination fgcse-lm -Common +Common Report Var(flag_gcse_lm) Init(1) Perform enhanced load motion during global common subexpression elimination fgcse-sm -Common +Common Report Var(flag_gcse_sm) Init(0) Perform store motion after global common subexpression elimination fgcse-las -Common -Perform redundant load after store elimination in global common subexpression elimination +Common Report Var(flag_gcse_las) Init(0) +Perform redundant load after store elimination in global common subexpression +elimination + +fgcse-after-reload +Common Report Var(flag_gcse_after_reload) +Perform global common subexpression elimination after register allocation +has finished fguess-branch-probability -Common +Common Report Var(flag_guess_branch_prob) 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 +Common Report Var(flag_no_ident,0) Process #ident directives fif-conversion -Common +Common Report Var(flag_if_conversion) Perform conversion of conditional jumps to branchless equivalents fif-conversion2 -Common +Common Report Var(flag_if_conversion2) 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 +Common Report Var(flag_inhibit_size_directive) Do not generate .size directives +; 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 +Common Report Var(flag_no_inline,0) Init(2) Pay attention to the \"inline\" keyword finline-functions -Common +Common Report Var(flag_inline_functions) Integrate simple functions into their callers +finline-functions-called-once +Common Report Var(flag_inline_functions_called_once) Init(1) +Integrate functions called once into their callers + finline-limit- Common RejectNegative Joined UInteger @@ -405,115 +530,166 @@ Common RejectNegative Joined UInteger -finline-limit=<number> Limit the size of inlined functions to <number> finstrument-functions -Common +Common Report Var(flag_instrument_function_entry_exit) Instrument function entry and exit with profiling calls +fipa-cp +Common Report Var(flag_ipa_cp) +Perform Interprocedural constant propagation + +fipa-pure-const +Common Report Var(flag_ipa_pure_const) Init(0) +Discover pure and const functions + +fipa-pta +Common Report Var(flag_ipa_pta) Init(0) +Perform interprocedural points-to analysis + +fipa-reference +Common Report Var(flag_ipa_reference) Init(0) +Discover readonly and non addressable static variables + +fipa-type-escape +Common Report Var(flag_ipa_type_escape) Init(0) +Type based escape and alias analysis + +fivopts +Common Report Var(flag_ivopts) Init(1) +Optimize induction variables on trees + +fjump-tables +Common Var(flag_jump_tables) Init(1) +Use jump tables for sufficiently large switch statements + fkeep-inline-functions -Common +Common Report Var(flag_keep_inline_functions) Generate code for functions even if they are fully inlined fkeep-static-consts -Common +Common Report Var(flag_keep_static_consts) Init(1) Emit static const variables even if they are not used fleading-underscore -Common +Common Report Var(flag_leading_underscore) Init(-1) Give external symbols a leading underscore floop-optimize Common -Perform loop optimizations +Does nothing. Preserved for backward compatibility. fmath-errno -Common +Common Report Var(flag_errno_math) Init(1) Set errno after built-in math functions fmem-report -Common +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 +Common Report Var(flag_merge_constants,2) Init(1) Attempt to merge identical constants and constant variables fmerge-constants -Common +Common Report Var(flag_merge_constants,1) VarExists Attempt to merge identical constants across compilation units fmessage-length= Common RejectNegative Joined UInteger -fmessage-length=<number> Limit diagnostics to <number> characters per line. 0 suppresses line-wrapping -fmove-all-movables -Common -Force all loop invariant computations out of loops +fmodulo-sched +Common Report Var(flag_modulo_sched) +Perform SMS based modulo scheduling before the first scheduling pass -fnew-ra -Common -Use graph-coloring register allocation +fmove-loop-invariants +Common Report Var(flag_move_loop_invariants) Init(1) +Move loop invariant computations out of loops -fnon-call-exceptions -Common -Support synchronous non-call exceptions +fmudflap +Common RejectNegative Report Var(flag_mudflap) +Add mudflap bounds-checking instrumentation for single-threaded program -fold-unroll-loops -Common -Perform loop unrolling when iteration count is known +fmudflapth +Common RejectNegative Report VarExists Var(flag_mudflap,2) +Add mudflap bounds-checking instrumentation for multi-threaded program -fold-unroll-all-loops -Common -Perform loop unrolling for all loops +fmudflapir +Common RejectNegative Report Var(flag_mudflap_ignore_reads) +Ignore read operations when inserting mudflap instrumentation + +freschedule-modulo-scheduled-loops +Common Report Var(flag_resched_modulo_sched) +Enable/Disable the traditional scheduling in loops that already passed modulo scheduling + +fnon-call-exceptions +Common Report Var(flag_non_call_exceptions) +Support synchronous non-call exceptions fomit-frame-pointer -Common +Common Report Var(flag_omit_frame_pointer) When possible do not generate stack frames foptimize-register-move -Common +Common Report Var(flag_regmove) Do the full register move optimization pass foptimize-sibling-calls -Common +Common Report Var(flag_optimize_sibling_calls) Optimize sibling and tail recursive calls fpack-struct -Common +Common Report Var(flag_pack_struct) Pack structure members together without holes +fpack-struct= +Common RejectNegative Joined UInteger +-fpack-struct=<number> Set initial maximum structure member alignment + fpcc-struct-return -Common +Common Report Var(flag_pcc_struct_return,1) VarExists Return small aggregates in memory, not registers fpeel-loops -Common +Common Report Var(flag_peel_loops) Perform loop peeling fpeephole -Common +Common Report Var(flag_no_peephole,0) Enable machine specific peephole optimizations fpeephole2 -Common +Common Report Var(flag_peephole2) 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 -Generate position-independent code if possible +Common Report Var(flag_pic,1) VarExists +Generate position-independent code if possible (small mode) fpie -Common -Generate position-independent code for executables if possible +Common Report Var(flag_pie,1) VarExists +Generate position-independent code for executables if possible (small mode) fprefetch-loop-arrays -Common +Common Report Var(flag_prefetch_loop_arrays) Generate prefetch instructions, if available, for arrays in loops fprofile -Common +Common Report Var(profile_flag) Enable basic program profiling code fprofile-arcs -Common +Common Report Var(profile_arc_flag) Insert arc-based program profiling code fprofile-generate @@ -525,7 +701,7 @@ Common Enable common options for performing profile feedback directed optimizations fprofile-values -Common +Common Report Var(flag_profile_values) Insert code to profile values of expressions frandom-seed @@ -535,56 +711,56 @@ frandom-seed= Common Joined RejectNegative -frandom-seed=<string> Make compile reproducible using <string> -freduce-all-givs -Common -Strength reduce all loop general induction variables - freg-struct-return -Common +Common Report Var(flag_pcc_struct_return,0) VarExists Return small aggregates in registers fregmove -Common +Common Report Var(flag_regmove) Enables a register move optimization frename-registers -Common +Common Report Var(flag_rename_registers) Init(2) Perform a register renaming optimization pass freorder-blocks -Common +Common Report Var(flag_reorder_blocks) Reorder basic blocks to improve code placement +freorder-blocks-and-partition +Common Report Var(flag_reorder_blocks_and_partition) +Reorder basic blocks and partition into hot and cold sections + freorder-functions -Common +Common Report Var(flag_reorder_functions) Reorder functions to improve code placement frerun-cse-after-loop -Common +Common Report Var(flag_rerun_cse_after_loop) Init(2) Add a common subexpression elimination pass after loop optimizations frerun-loop-opt Common -Run the loop optimizer twice +Does nothing. Preserved for backward compatibility. frounding-math -Common +Common Report Var(flag_rounding_math) Disable optimizations that assume default FP rounding behavior fsched-interblock -Common +Common Report Var(flag_schedule_interblock) Init(1) Enable scheduling across basic blocks fsched-spec -Common +Common Report Var(flag_schedule_speculative) Init(1) Allow speculative motion of non-loads fsched-spec-load -Common +Common Report Var(flag_schedule_speculative_load) Allow speculative motion of some loads fsched-spec-load-dangerous -Common +Common Report Var(flag_schedule_speculative_load_dangerous) Allow speculative motion of more loads fsched-verbose= @@ -592,51 +768,79 @@ Common RejectNegative Joined -fsched-verbose=<number> Set the verbosity level of the scheduler fsched2-use-superblocks -Common +Common Report Var(flag_sched2_use_superblocks) If scheduling post reload, do superblock scheduling fsched2-use-traces -Common +Common Report Var(flag_sched2_use_traces) If scheduling post reload, do trace scheduling fschedule-insns -Common +Common Report Var(flag_schedule_insns) Reschedule instructions before register allocation fschedule-insns2 -Common +Common Report Var(flag_schedule_insns_after_reload) 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 +Common Report Var(flag_sched_stalled_insns) Allow premature scheduling of queued insns fsched-stalled-insns= -Common RejectNegative Joined UInteger --fsched-stalled-insns=<number> Set number of queued insns that can be prematurely scheduled +Common RejectNegative Joined UInteger +-fsched-stalled-insns=<number> 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 +Common Report Var(flag_sched_stalled_insns_dep,1) Init(1) Set dependence distance checking in premature scheduling of queued insns fsched-stalled-insns-dep= Common RejectNegative Joined UInteger --fsched-stalled-insns-dep=<number> Set dependence distance checking in premature scheduling of queued insns +-fsched-stalled-insns-dep=<number> Set dependence distance checking in premature scheduling of queued insns -fshared-data -Common -Mark data as shared rather than private +fsection-anchors +Common Report Var(flag_section_anchors) +Access data in the same section from shared anchor points + +frtl-abstract-sequences +Common Report Var(flag_rtl_seqabstr) +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 fsignaling-nans -Common +Common Report Var(flag_signaling_nans) Disable optimizations observable by IEEE signaling NaNs fsingle-precision-constant -Common +Common Report Var(flag_single_precision_constant) Convert floating point constants to single precision constants +fsplit-ivs-in-unroller +Common Report Var(flag_split_ivs_in_unroller) Init(1) +Split lifetimes of induction variables when loops are unrolled + +fvariable-expansion-in-unroller +Common Report Var(flag_variable_expansion_in_unroller) +Apply variable expansion when loops are unrolled + +; Emit code to probe the stack, to help detect stack overflow; also +; may cause large objects to be allocated dynamically. fstack-check -Common +Common Report Var(flag_stack_check) Insert stack checking code into the program fstack-limit @@ -650,92 +854,241 @@ fstack-limit-symbol= Common RejectNegative Joined -fstack-limit-symbol=<name> Trap if the stack goes past symbol <name> +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 -Perform strength reduction optimizations +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 +Common Report Var(flag_strict_aliasing) Assume strict aliasing rules apply +fstrict-overflow +Common Report Var(flag_strict_overflow) +Treat signed overflow as undefined + fsyntax-only -Common +Common Report Var(flag_syntax_only) Check for syntax errors, then stop ftest-coverage -Common +Common Report Var(flag_test_coverage) Create data files needed by \"gcov\" fthread-jumps -Common +Common Report Var(flag_thread_jumps) Perform jump threading optimizations ftime-report -Common +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(1) +Reorder top level functions, variables, and asms + ftracer -Common +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 +Common Report Var(flag_trapping_math) Init(1) Assume floating-point operations can trap ftrapv -Common +Common Report Var(flag_trapv) Trap for signed overflow in addition, subtraction and multiplication +ftree-ccp +Common Report Var(flag_tree_ccp) +Enable SSA-CCP optimization on trees + +ftree-store-ccp +Common Report Var(flag_tree_store_ccp) +Enable SSA-CCP optimization for stores and loads + +ftree-ch +Common Report Var(flag_tree_ch) +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) +Replace SSA temporaries with better names in copies + +ftree-copy-prop +Common Report Var(flag_tree_copy_prop) +Enable copy propagation on trees + +ftree-store-copy-prop +Common Report Var(flag_tree_store_copy_prop) +Enable copy propagation for stores and loads + +ftree-dce +Common Report Var(flag_tree_dce) +Enable SSA dead code elimination optimization on trees + +ftree-dominator-opts +Common Report Var(flag_tree_dom) +Enable dominator optimizations + +ftree-dse +Common Report Var(flag_tree_dse) +Enable dead store elimination + +ftree-fre +Common Report Var(flag_tree_fre) +Enable Full Redundancy Elimination (FRE) on trees + +ftree-loop-im +Common Report Var(flag_tree_loop_im) Init(1) +Enable loop invariant motion on trees + +ftree-loop-linear +Common Report Var(flag_tree_loop_linear) +Enable linear loop transforms on trees + +ftree-loop-ivcanon +Common Report Var(flag_tree_loop_ivcanon) Init(1) +Create canonical induction variables in loops + +ftree-loop-optimize +Common Report Var(flag_tree_loop_optimize) Init(1) +Enable loop optimizations on tree level + +ftree-pre +Common Report Var(flag_tree_pre) +Enable SSA-PRE optimization on trees + +ftree-salias +Common Report Var(flag_tree_salias) +Perform structural alias analysis + +ftree-sink +Common Report Var(flag_tree_sink) +Enable SSA code sinking on trees + +ftree-sra +Common Report Var(flag_tree_sra) +Perform scalar replacement of aggregates + +ftree-ter +Common Report Var(flag_tree_ter) +Replace temporary expressions in the SSA->normal pass + +ftree-lrs +Common Report Var(flag_tree_live_range_split) +Perform live range splitting during the SSA->normal pass + +ftree-vrp +Common Report Var(flag_tree_vrp) Init(0) +Perform Value Range Propagation on trees + funit-at-a-time -Common +Common Report Var(flag_unit_at_a_time) Compile whole compilation unit at a time funroll-loops -Common +Common Report Var(flag_unroll_loops) Perform loop unrolling when iteration count is known funroll-all-loops -Common +Common Report Var(flag_unroll_all_loops) 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) +Allow loop optimizations to assume that the loops behave in normal way + +; 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 +Common Report Var(flag_unsafe_math_optimizations) Allow math optimizations that may violate IEEE or ISO standards funswitch-loops -Common +Common Report Var(flag_unswitch_loops) Perform loop unswitching funwind-tables -Common +Common Report Var(flag_unwind_tables) Just generate unwind tables for exception handling +fvar-tracking +Common Report Var(flag_var_tracking) VarExists +Perform variable tracking + +ftree-vectorize +Common Report Var(flag_tree_vectorize) +Enable loop vectorization on trees + +ftree-vect-loop-version +Common Report Var(flag_tree_vect_loop_version) Init(1) +Enable loop versioning when doing loop vectorization on trees + +ftree-vectorizer-verbose= +Common RejectNegative Joined +-ftree-vectorizer-verbose=<number> Set the verbosity level of the vectorizer + +; -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 +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 +Common Report Var(flag_value_profile_transformations) Use expression value profiles in optimizations fweb -Common +Common Report Var(flag_web) Init(2) Construct webs and split unrelated uses of single variable +fwhole-program +Common Report Var(flag_whole_program) Init(0) +Perform whole program optimizations + fwrapv -Common +Common Report Var(flag_wrapv) Assume signed arithmetic overflow wraps around -fwritable-strings -Common -Store strings in writable data section - fzero-initialized-in-bss -Common +Common Report Var(flag_zero_initialized_in_bss) Init(1) Put zero initialized data in the bss section g @@ -743,11 +1096,11 @@ 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 @@ -755,38 +1108,35 @@ 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 -m -Common Joined - o Common Joined Separate -o <file> Place output into <file> p -Common +Common Var(profile_flag) Enable function profiling pedantic -Common +Common Var(pedantic) Issue warnings needed for strict compliance to the standard pedantic-errors @@ -794,15 +1144,15 @@ Common Like -pedantic but issue them as errors quiet -Common +Common Var(quiet_flag) Do not display functions compiled or elapsed time version -Common +Common Var(version_flag) Display the compiler's version w -Common +Common Var(inhibit_warnings) Suppress warnings ; This comment is to ensure we retain the blank line above. |