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Diffstat (limited to 'gcc-4.2.1/gcc/common.opt')
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diff --git a/gcc-4.2.1/gcc/common.opt b/gcc-4.2.1/gcc/common.opt new file mode 100644 index 000000000..cc172129a --- /dev/null +++ b/gcc-4.2.1/gcc/common.opt @@ -0,0 +1,1170 @@ +; Options for the language- and target-independent parts of the compiler. + +; Copyright (C) 2003, 2004, 2005, 2006 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 +; 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. + +; See the GCC internals manual for a description of this file's format. + +; Please try to keep this file in ASCII collating order. + +-help +Common +Display this information + +-param +Common Separate +--param <param>=<value> Set parameter <param> to value. See below for a complete list of parameters + +-target-help +Common + +-version +Common + +G +Common Joined Separate UInteger +-G<number> Put global and static data smaller than <number> bytes into a special section (on some targets) + +O +Common JoinedOrMissing +-O<number> Set optimization level to <number> + +Os +Common +Optimize for space rather than speed + +W +Common RejectNegative +This switch is deprecated; use -Wextra instead + +Waggregate-return +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 Var(warn_cast_align) +Warn about pointer casts which increase alignment + +Wdeprecated-declarations +Common Var(warn_deprecated_decl) Init(1) +Warn about uses of __attribute__((deprecated)) declarations + +Wdisabled-optimization +Common Var(warn_disabled_optimization) +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 +Print extra (possibly unwanted) warnings + +Wfatal-errors +Common Var(flag_fatal_errors) +Exit on the first error occurred + +Winline +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 + +Wframe-larger-than- +Common RejectNegative Joined UInteger +-Wframe-larger-than-<number> Warn if the frame size of a function 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 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 Var(warn_packed) +Warn when the packed attribute has no effect on struct layout + +Wpadded +Common Var(warn_padded) +Warn when padding is required to align structure members + +Wshadow +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 + +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 Var(warn_switch_default) +Warn about enumerated switches missing a \"default:\" statement + +Wswitch-enum +Common Var(warn_switch_enum) +Warn about all enumerated switches missing a specific case + +Wsystem-headers +Common Var(warn_system_headers) +Do not suppress warnings from system headers + +Wuninitialized +Common Var(warn_uninitialized) +Warn about uninitialized automatic variables + +Wunreachable-code +Common Var(warn_notreached) +Warn about code that will never be executed + +Wunused +Common +Enable all -Wunused- warnings + +Wunused-function +Common Var(warn_unused_function) +Warn when a function is unused + +Wunused-label +Common Var(warn_unused_label) +Warn when a label is unused + +Wunused-parameter +Common Var(warn_unused_parameter) +Warn when a function parameter is unused + +Wunused-value +Common Var(warn_unused_value) +Warn when an expression value is unused + +Wunused-variable +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> + +aux-info= +Common Joined + +auxbase +Common Separate + +auxbase-strip +Common Separate + +d +Common Joined +-d<letters> Enable dumps from specific passes of the compiler + +dumpbase +Common Separate +-dumpbase <file> 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. +; +; 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) +Align the start of functions + +falign-functions= +Common RejectNegative Joined UInteger + +falign-jumps +Common Report Var(align_jumps,0) +Align labels which are only reached by jumping + +falign-jumps= +Common RejectNegative Joined UInteger + +falign-labels +Common Report Var(align_labels,0) +Align all labels + +falign-labels= +Common RejectNegative Joined UInteger + +falign-loops +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 Report Var(flag_argument_noalias,0) +Specify that arguments may alias each other and globals + +fargument-noalias +Common Report Var(flag_argument_noalias,1) VarExists +Assume arguments may alias globals but not each other + +fargument-noalias-global +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 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 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) +Replace add, compare, branch with branch on count register + +fbranch-probabilities +Common Report Var(flag_branch_probabilities) +Use profiling information for branch probabilities + +fbranch-target-load-optimize +Common Report Var(flag_branch_target_load_optimize) +Perform branch target load optimization before prologue / epilogue threading + +fbranch-target-load-optimize2 +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 + +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 Report Var(flag_caller_saves) +Save registers around function calls + +fcommon +Common Report Var(flag_no_common,0) +Do not put uninitialized globals in the common section + +fcprop-registers +Common Report Var(flag_cprop_registers) +Perform a register copy-propagation optimization pass + +fcrossjumping +Common Report Var(flag_crossjumping) +Perform cross-jumping optimization + +fcse-follow-jumps +Common Report Var(flag_cse_follow_jumps) +When running CSE, follow jumps to their targets + +fcse-skip-blocks +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 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 Report Var(flag_defer_pop) +Defer popping functions args from stack until later + +fdelayed-branch +Common Report Var(flag_delayed_branch) +Attempt to fill delay slots of branch instructions + +fdelete-null-pointer-checks +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 + +fdiagnostics-show-option +Common +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 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(1) +Do not suppress C++ class debug information. + +fexceptions +Common Report Var(flag_exceptions) +Enable exception handling + +fexpensive-optimizations +Common Report Var(flag_expensive_optimizations) +Perform a number of minor, expensive optimizations + +ffast-math +Common + +ffinite-math-only +Common Report Var(flag_finite_math_only) +Assume no NaNs or infinities are generated + +ffixed- +Common Joined RejectNegative +-ffixed-<register> Mark <register> as being unavailable to the compiler + +ffloat-store +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 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 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 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) +Perform global common subexpression elimination + +fgcse-lm +Common Report Var(flag_gcse_lm) Init(1) +Perform enhanced load motion during global common subexpression elimination + +fgcse-sm +Common Report Var(flag_gcse_sm) Init(0) +Perform store motion after global common subexpression elimination + +fgcse-las +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 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 Report Var(flag_no_ident,0) +Process #ident directives + +fif-conversion +Common Report Var(flag_if_conversion) +Perform conversion of conditional jumps to branchless equivalents + +fif-conversion2 +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 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 Report Var(flag_no_inline,0) Init(2) +Pay attention to the \"inline\" keyword + +finline-functions +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 + +finline-limit= +Common RejectNegative Joined UInteger +-finline-limit=<number> Limit the size of inlined functions to <number> + +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) +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 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) +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) +Attempt to merge identical constants and constant variables + +fmerge-constants +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 + +fmodulo-sched +Common Report Var(flag_modulo_sched) +Perform SMS based modulo scheduling before the first scheduling pass + +fmove-loop-invariants +Common Report Var(flag_move_loop_invariants) Init(1) +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 + +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 Report Var(flag_omit_frame_pointer) +When possible do not generate stack frames + +foptimize-register-move +Common Report Var(flag_regmove) +Do the full register move optimization pass + +foptimize-sibling-calls +Common Report Var(flag_optimize_sibling_calls) +Optimize sibling and tail recursive calls + +fpack-struct +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 Report Var(flag_pcc_struct_return,1) VarExists +Return small aggregates in memory, not registers + +fpeel-loops +Common Report Var(flag_peel_loops) +Perform loop peeling + +fpeephole +Common Report Var(flag_no_peephole,0) +Enable machine specific peephole optimizations + +fpeephole2 +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 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) + +fprefetch-loop-arrays +Common Report Var(flag_prefetch_loop_arrays) +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-generate +Common +Enable common options for generating profile info for profile feedback directed optimizations + +fprofile-use +Common +Enable common options for performing profile feedback directed optimizations + +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=<string> Make compile reproducible using <string> + +freg-struct-return +Common Report Var(flag_pcc_struct_return,0) VarExists +Return small aggregates in registers + +fregmove +Common Report Var(flag_regmove) +Enables a register move optimization + +frename-registers +Common Report Var(flag_rename_registers) Init(2) +Perform a register renaming optimization pass + +freorder-blocks +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 Report Var(flag_reorder_functions) +Reorder functions to improve code placement + +frerun-cse-after-loop +Common Report Var(flag_rerun_cse_after_loop) Init(2) +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) +Disable optimizations that assume default FP rounding behavior + +fsched-interblock +Common Report Var(flag_schedule_interblock) Init(1) +Enable scheduling across basic blocks + +fsched-spec +Common Report Var(flag_schedule_speculative) Init(1) +Allow speculative motion of non-loads + +fsched-spec-load +Common Report Var(flag_schedule_speculative_load) +Allow speculative motion of some loads + +fsched-spec-load-dangerous +Common Report Var(flag_schedule_speculative_load_dangerous) +Allow speculative motion of more loads + +fsched-verbose= +Common RejectNegative Joined +-fsched-verbose=<number> Set the verbosity level of the scheduler + +fsched2-use-superblocks +Common Report Var(flag_sched2_use_superblocks) +If scheduling post reload, do superblock scheduling + +fsched2-use-traces +Common Report Var(flag_sched2_use_traces) +If scheduling post reload, do trace scheduling + +fschedule-insns +Common Report Var(flag_schedule_insns) +Reschedule instructions before register allocation + +fschedule-insns2 +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 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 + +; 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) +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 + +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 Report Var(flag_signaling_nans) +Disable optimizations observable by IEEE signaling NaNs + +fsingle-precision-constant +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 Report Var(flag_stack_check) +Insert stack checking code into the program + +fstack-limit +Common + +fstack-limit-register= +Common RejectNegative Joined +-fstack-limit-register=<register> Trap if the stack goes past <register> + +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 +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) +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) +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(1) +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) +Assume floating-point operations can trap + +ftrapv +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 Report Var(flag_unit_at_a_time) +Compile whole compilation unit at a time + +funroll-loops +Common Report Var(flag_unroll_loops) +Perform loop unrolling when iteration count is known + +funroll-all-loops +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 Report Var(flag_unsafe_math_optimizations) +Allow math optimizations that may violate IEEE or ISO standards + +funswitch-loops +Common Report Var(flag_unswitch_loops) +Perform loop unswitching + +funwind-tables +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 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) +Use expression value profiles in optimizations + +fweb +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 Report Var(flag_wrapv) +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 <file> Place output into <file> + +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 + +; This comment is to ensure we retain the blank line above. |