; Options for the language- and target-independent parts of the compiler.
-; Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
+; Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012
; Free Software Foundation, Inc.
;
; This file is part of GCC.
Variable
int optimize_size
+Variable
+int optimize_debug
+
+; Not used directly to control optimizations, only to save -Ofast
+; setting for "optimize" attributes.
+Variable
+int optimize_fast
+
+; True if this is the lto front end. This is used to disable gimple
+; generation and lowering passes that are normally run on the output
+; of a front end. These passes must be bypassed for lto since they
+; have already been done before the gimple was written.
+Variable
+bool in_lto_p = false
+
; 0 means straightforward implementation of complex divide acceptable.
; 1 means wide ranges of inputs must work for complex divide.
; 2 means C99-like requirements for complex multiply and divide.
Variable
unsigned int initial_max_fld_align = TARGET_DEFAULT_PACK_STRUCT
-Variable
-enum vect_verbosity_levels user_vect_verbosity_level = MAX_VERBOSITY_LEVEL
-
; Type of stack check.
Variable
enum stack_check_type flag_stack_check = NO_STACK_CHECK
+; True if stack usage information needs to be computed.
+Variable
+bool flag_stack_usage_info = false
+
; -dA causes debug commentary information to be produced in
; the generated assembly code (to make it more readable). This option
; is generally only of use to those who actually need to read the
-no-standard-libraries
Driver Alias(nostdlib)
+-no-sysroot-suffix
+Driver Var(no_sysroot_suffix)
+
-no-warnings
Common Alias(w)
Driver Alias(pass-exit-codes)
-pedantic
-Common Alias(pedantic)
+Common Alias(Wpedantic)
-pedantic-errors
Common Alias(pedantic-errors)
-pie
-Common Alias(pie)
+Driver Alias(pie)
-pipe
Driver Alias(pipe)
-print-multi-os-directory
Driver Alias(print-multi-os-directory)
+-print-multiarch
+Driver Alias(print-multiarch)
+
-print-prog-name
Driver Separate Alias(print-prog-name=)
Driver Alias(save-temps)
-shared
-Common Alias(shared)
+Driver Alias(shared)
-specs
Driver Separate Alias(specs=)
L
Driver Joined Separate
+N
+Driver
+
O
Common JoinedOrMissing Optimization
-O<number> Set optimization level to <number>
Common Optimization
Optimize for speed disregarding exact standards compliance
+Og
+Common Optimization
+Optimize for debugging experience rather than speed or size
+
+Q
+Driver
+
+Qn
+Driver Negative(Qy)
+
+Qy
+Driver Negative(Qn)
+
R
Driver Joined Separate
Tbss
Driver Separate
+Tbss=
+Driver Joined
+
Tdata
Driver Separate
+Tdata=
+Driver Joined
+
Ttext
Driver Separate
+Ttext=
+Driver Joined
+
W
Common RejectNegative Warning Alias(Wextra)
This switch is deprecated; use -Wextra instead
Common RejectNegative Joined UInteger
-Wframe-larger-than=<number> Warn if a function's stack frame requires more than <number> bytes
+Wfree-nonheap-object
+Common Var(warn_free_nonheap_object) Init(1) Warning
+Warn when attempting to free a non-heap object
+
Winline
Common Var(warn_inline) Warning
Warn when an inlined function cannot be inlined
+Winvalid-memory-model
+Common Var(warn_invalid_memory_model) Init(1) Warning
+Warn when an atomic memory model parameter is known to be outside the valid range.
+
Wlarger-than-
Common RejectNegative Joined Warning Undocumented Alias(Wlarger-than=)
Warn if the loop cannot be optimized due to nontrivial assumptions.
Wmissing-noreturn
-Common Var(warn_missing_noreturn) Warning
-Warn about functions which might be candidates for __attribute__((noreturn))
-
-Wmudflap
-Common Var(warn_mudflap) Init(1) Warning
-Warn about constructs not instrumented by -fmudflap
+Common Alias(Wsuggest-attribute=noreturn)
Woverflow
Common Var(warn_overflow) Init(1) Warning
Common Var(warn_padded) Warning
Warn when padding is required to align structure members
+Wpedantic
+Common Var(pedantic) Warning
+Issue warnings needed for strict compliance to the standard
+
Wshadow
Common Var(warn_shadow) Warning
Warn when one local variable shadows another
Common Var(warn_stack_protect) Warning
Warn when not issuing stack smashing protection for some reason
+Wstack-usage=
+Common Joined RejectNegative UInteger Var(warn_stack_usage) Init(-1) Warning
+Warn if stack usage might be larger than specified amount
+
Wstrict-aliasing
Common Warning
Warn about code which might break strict aliasing rules
Wstrict-aliasing=
-Common Joined RejectNegative UInteger Var(warn_strict_aliasing) Init(-1) Warning
+Common Joined RejectNegative UInteger Var(warn_strict_aliasing) Warning
Warn about code which might break strict aliasing rules
Wstrict-overflow
Warn about optimizations that assume that signed overflow is undefined
Wstrict-overflow=
-Common Joined RejectNegative UInteger Var(warn_strict_overflow) Init(-1) Warning
+Common Joined RejectNegative UInteger Var(warn_strict_overflow) Warning
Warn about optimizations that assume that signed overflow is undefined
Wsuggest-attribute=const
Common Var(warn_suggest_attribute_noreturn) Warning
Warn about functions which might be candidates for __attribute__((noreturn))
-Wswitch
-Common Var(warn_switch) Warning
-Warn about enumerated switches, with no default, missing a case
-
-Wswitch-default
-Common Var(warn_switch_default) Warning
-Warn about enumerated switches missing a \"default:\" statement
-
-Wswitch-enum
-Common Var(warn_switch_enum) Warning
-Warn about all enumerated switches missing a specific case
-
Wsystem-headers
Common Var(warn_system_headers) Warning
Do not suppress warnings from system headers
Warn whenever a trampoline is generated
Wtype-limits
-Common Var(warn_type_limits) Init(-1) Warning
+Common Var(warn_type_limits) Warning EnabledBy(Wextra)
Warn if a comparison is always true or always false due to the limited range of the data type
Wuninitialized
-Common Var(warn_uninitialized) Init(-1) Warning
+Common Var(warn_uninitialized) Warning EnabledBy(Wextra)
Warn about uninitialized automatic variables
+Wmaybe-uninitialized
+Common Var(warn_maybe_uninitialized) Warning EnabledBy(Wuninitialized)
+Warn about maybe uninitialized automatic variables
+
Wunreachable-code
Common Ignore
Does nothing. Preserved for backward compatibility.
Enable all -Wunused- warnings
Wunused-but-set-parameter
-Common Var(warn_unused_but_set_parameter) Init(-1) Warning
+Common Var(warn_unused_but_set_parameter) Warning EnabledBy(Wunused && Wextra)
Warn when a function parameter is only set, otherwise unused
Wunused-but-set-variable
-Common Var(warn_unused_but_set_variable) Init(-1) Warning
+Common Var(warn_unused_but_set_variable) Warning EnabledBy(Wunused)
Warn when a variable is only set, otherwise unused
Wunused-function
-Common Var(warn_unused_function) Init(-1) Warning
+Common Var(warn_unused_function) Warning EnabledBy(Wunused)
Warn when a function is unused
Wunused-label
-Common Var(warn_unused_label) Init(-1) Warning
+Common Var(warn_unused_label) Warning EnabledBy(Wunused)
Warn when a label is unused
Wunused-parameter
-Common Var(warn_unused_parameter) Init(-1) Warning
+Common Var(warn_unused_parameter) Warning EnabledBy(Wunused && Wextra)
Warn when a function parameter is unused
Wunused-value
-Common Var(warn_unused_value) Init(-1) Warning
+Common Var(warn_unused_value) Warning EnabledBy(Wunused)
Warn when an expression value is unused
Wunused-variable
-Common Var(warn_unused_variable) Init(-1) Warning
+Common Var(warn_unused_variable) Warning EnabledBy(Wunused)
Warn when a variable is unused
Wcoverage-mismatch
Common Var(warn_coverage_mismatch) Init(1) Warning
Warn in case profiles in -fprofile-use do not match
+Wvector-operation-performance
+Common Var(warn_vector_operation_performance) Warning
+Warn when a vector operation is compiled outside the SIMD
+
Xassembler
Driver Separate
Xpreprocessor
Driver Separate
+Z
+Driver
+
aux-info
Common Separate Var(aux_info_file_name)
-aux-info <file> Emit declaration information into <file>
e
Driver Joined Separate
+; This option has historically been passed down to the linker by an
+; accident of a %{e*} spec, so ensure it continues to be passed down
+; as a single option. The supported option for this purpose is
+; -rdynamic. See PR 47390.
+export-dynamic
+Driver Undocumented
+
; The version of the C++ ABI in use. The following values are allowed:
;
; 0: The version of the ABI believed most conformant with the C++ ABI
; in template non-type arguments of pointer type.
;
; 4: The version of the ABI that introduces unambiguous mangling of
-; vector types.
+; vector types. First selectable in G++ 4.5.
+;
+; 5: The version of the ABI that ignores attribute const/noreturn
+; in function pointer mangling, and corrects mangling of decltype and
+; function parameters used in other parameters and the return type.
+; First selectable in G++ 4.6.
;
+; 6: The version of the ABI that doesn't promote scoped enums to int and
+; changes the mangling of template argument packs, const/static_cast,
+; prefix ++ and --, and a class scope function used as a template
+; argument.
+; First selectable in G++ 4.7.
+;
+; 7: The version of the ABI that treats nullptr_t as a builtin type.
+; First selectable in G++ 4.8.
; Additional positive integers will be assigned as new versions of
; the ABI become the default version of the ABI.
fabi-version=
Common Ignore
Does nothing. Preserved for backward compatibility.
+faddress-sanitizer
+Common Report Var(flag_asan)
+Enable AddressSanitizer, a memory error detector
+
fasynchronous-unwind-tables
Common Report Var(flag_asynchronous_unwind_tables) Optimization
Generate unwind tables that are exact at each instruction boundary
Common Driver RejectNegative Var(flag_compare_debug)
Run only the second compilation of -fcompare-debug
+fcompare-elim
+Common Report Var(flag_compare_elim_after_reload) Optimization
+Perform comparison elimination after register allocation has finished
+
fconserve-stack
Common Var(flag_conserve_stack) Optimization
Do not perform optimizations increasing noticeably stack usage
Does nothing. Preserved for backward compatibility.
fcx-limited-range
-Common Report Var(flag_cx_limited_range) Optimization
+Common Report Var(flag_cx_limited_range) Optimization SetByCombined
Omit range reduction step when performing complex division
fcx-fortran-rules
Common Joined RejectNegative Var(common_deferred_options) Defer
Map one directory name to another in debug information
+fdebug-types-section
+Common Report Var(flag_debug_types_section) Init(0)
+Output .debug_types section when using DWARF v4 debuginfo.
+
; Nonzero for -fdefer-pop: don't pop args after each function call
; instead save them up to pop many calls' args with one insns.
fdefer-pop
Common Report Var(flag_delayed_branch) Optimization
Attempt to fill delay slots of branch instructions
+fdelete-dead-exceptions
+Common Report Var(flag_delete_dead_exceptions) Init(0)
+Delete dead instructions that may throw exceptions
+
fdelete-null-pointer-checks
Common Report Var(flag_delete_null_pointer_checks) Init(1) Optimization
Delete useless null pointer checks
+fdevirtualize
+Common Report Var(flag_devirtualize) Optimization
+Try to convert virtual calls to direct ones.
+
fdiagnostics-show-location=
Common Joined RejectNegative Enum(diagnostic_prefixing_rule)
-fdiagnostics-show-location=[once|every-line] How often to emit source location at the beginning of line-wrapped diagnostics
EnumValue
Enum(diagnostic_prefixing_rule) String(every-line) Value(DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE)
+fdiagnostics-show-caret
+Common Var(flag_diagnostics_show_caret) Init(1)
+Show the source line with a caret indicating the column
+
fdiagnostics-show-option
Common Var(flag_diagnostics_show_option) Init(1)
Amend appropriate diagnostic messages with the command line option that controls them
+fdisable-
+Common Joined RejectNegative Var(common_deferred_options) Defer
+-fdisable-[tree|rtl|ipa]-<pass>=range1+range2 disables an optimization pass
+
+fenable-
+Common Joined RejectNegative Var(common_deferred_options) Defer
+-fenable-[tree|rtl|ipa]-<pass>=range1+range2 enables an optimization pass
+
fdump-
Common Joined RejectNegative Var(common_deferred_options) Defer
-fdump-<type> Dump various compiler internals to a file
Common Report Var(flag_dump_noaddr)
Suppress output of addresses in debugging dumps
+fdump-passes
+Common Var(flag_dump_passes) Init(0)
+Dump optimization passes
+
fdump-unnumbered
Common Report Var(flag_dump_unnumbered)
Suppress output of instruction numbers, line number notes and addresses in debugging dumps
Common Report Var(flag_emit_class_debug_always) Init(0)
Do not suppress C++ class debug information.
-fenable-icf-debug
-Common Report Var(flag_enable_icf_debug)
-Generate debug information to support Identical Code Folding (ICF)
-
fexceptions
Common Report Var(flag_exceptions) Optimization
Enable exception handling
ffast-math
Common
+ffat-lto-objects
+Common Var(flag_fat_lto_objects) Init(1)
+Output lto objects containing both the intermediate language and binary output.
+
ffinite-math-only
-Common Report Var(flag_finite_math_only) Optimization
+Common Report Var(flag_finite_math_only) Optimization SetByCombined
Assume no NaNs or infinities are generated
ffixed-
Common Report Var(flag_graphite_identity) Optimization
Enable Graphite Identity transformation
+fhoist-adjacent-loads
+Common Report Var(flag_hoist_adjacent_loads) Optimization
+Enable hoisting adjacent loads to encourage generating conditional move
+instructions
+
floop-parallelize-all
Common Report Var(flag_loop_parallelize_all) Optimization
Mark all loops as parallel
Common Report Var(flag_loop_block) Optimization
Enable Loop Blocking transformation
+fgnu-tm
+Common Report Var(flag_tm)
+Enable support for GNU transactional memory
+
floop-flatten
-Common Report Var(flag_loop_flatten) Optimization
-Enable Loop Flattening transformation
+Common Ignore
+Does nothing. Preserved for backward compatibility.
+
+floop-nest-optimize
+Common Report Var(flag_loop_optimize_isl) Optimization
+Enable the ISL based loop nest optimizer
fstrict-volatile-bitfields
Common Report Var(flag_strict_volatile_bitfields) Init(-1)
Common Report Var(flag_if_conversion2) Optimization
Perform conversion of conditional jumps to conditional execution
+fstack-reuse=
+Common Joined RejectNegative Enum(stack_reuse_level) Var(flag_stack_reuse) Init(SR_ALL)
+-fstack-reuse=[all|named_vars|none] Set stack reuse level for local variables.
+
+Enum
+Name(stack_reuse_level) Type(enum stack_reuse_level) UnknownError(unknown Stack Reuse Level %qs)
+
+EnumValue
+Enum(stack_reuse_level) String(all) Value(SR_ALL)
+
+EnumValue
+Enum(stack_reuse_level) String(named_vars) Value(SR_NAMED_VARS)
+
+EnumValue
+Enum(stack_reuse_level) String(none) Value(SR_NONE)
+
ftree-loop-if-convert
Common Report Var(flag_tree_loop_if_convert) Init(-1) Optimization
Convert conditional jumps in innermost loops to branchless equivalents
Common Report Var(flag_indirect_inlining)
Perform indirect inlining
-; Nonzero means that functions declared `inline' will be treated
-; as `static'. Prevents generation of zillions of copies of unused
-; static inline functions; instead, `inlines' are written out
-; only when actually used. Used in conjunction with -g. Also
-; does the right thing with #pragma interface.
+; General flag to enable inlining. Specifying -fno-inline will disable
+; all inlining apart from always-inline functions.
finline
-Common Report Var(flag_no_inline,0) Init(0)
-Pay attention to the \"inline\" keyword
+Common Report Var(flag_no_inline,0) Init(0) Optimization
+Enable inlining of function declared \"inline\", disabling disables all inlining
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
+Integrate functions into their callers when code size is known not to grow
finline-functions
Common Report Var(flag_inline_functions) Optimization
-Integrate simple functions into their callers
+Integrate functions not declared \"inline\" into their callers when profitable
finline-functions-called-once
-Common Report Var(flag_inline_functions_called_once) Init(1) Optimization
-Integrate functions called once into their callers
+Common Report Var(flag_inline_functions_called_once) Optimization
+Integrate functions only required by their single caller
finline-limit-
Common RejectNegative Joined Alias(finline-limit=)
Common RejectNegative Joined UInteger
-finline-limit=<number> Limit the size of inlined functions to <number>
+finline-atomics
+Common Report Var(flag_inline_atomics) Init(1) Optimization
+Inline __atomic operations when a lock free instruction sequence is available.
+
finstrument-functions
Common Report Var(flag_instrument_function_entry_exit)
Instrument function entry and exit with profiling calls
Discover readonly and non addressable static variables
fipa-matrix-reorg
-Common Report Var(flag_ipa_matrix_reorg) Optimization
-Perform matrix layout flattening and transposing based
-on profiling information.
+Common Ignore
+Does nothing. Preserved for backward compatibility.
fipa-struct-reorg
-Common Report Var(flag_ipa_struct_reorg)
-Perform structure layout optimizations based
-on profiling information.
+Common Ignore
+Does nothing. Preserved for backward compatibility.
fira-algorithm=
Common Joined RejectNegative Enum(ira_algorithm) Var(flag_ira_algorithm) Init(IRA_ALGORITHM_CB)
Enum(ira_algorithm) String(priority) Value(IRA_ALGORITHM_PRIORITY)
fira-region=
-Common Joined RejectNegative Enum(ira_region) Var(flag_ira_region) Init(IRA_REGION_MIXED)
+Common Joined RejectNegative Enum(ira_region) Var(flag_ira_region) Init(IRA_REGION_AUTODETECT)
-fira-region=[one|all|mixed] Set regions for IRA
Enum
EnumValue
Enum(ira_region) String(mixed) Value(IRA_REGION_MIXED)
+fira-hoist-pressure
+Common Report Var(flag_ira_hoist_pressure) Init(1) Optimization
+Use IRA based register pressure calculation
+in RTL hoist optimizations.
+
fira-loop-pressure
Common Report Var(flag_ira_loop_pressure)
Use IRA based register pressure calculation
flto-partition=1to1
Common Var(flag_lto_partition_1to1)
-Partition functions and vars at linktime based on object files they originate from
+Partition symbols and vars at linktime based on object files they originate from
flto-partition=balanced
Common Var(flag_lto_partition_balanced)
Partition functions and vars at linktime into approximately same sized buckets
+flto-partition=max
+Common Var(flag_lto_partition_max)
+Put every symbol into separate partition
+
flto-partition=none
Common Var(flag_lto_partition_none)
Disable partioning and streaming
-flto-compression-level=<number> Use zlib compression level <number> for IL
flto-report
-Common Report Var(flag_lto_report) Init(0) Optimization
+Common Report Var(flag_lto_report) Init(0)
Report various link-time optimization statistics
fmath-errno
-Common Report Var(flag_errno_math) Init(1) Optimization
+Common Report Var(flag_errno_math) Init(1) Optimization SetByCombined
Set errno after built-in math functions
fmax-errors=
Common Report Var(mem_report)
Report on permanent memory allocation
+fmem-report-wpa
+Common Report Var(mem_report_wpa)
+Report on permanent memory allocation in WPA only
+
; This will attempt to merge constant section constants, if 1 only
; string constants and constants from constant pool, if 2 also constant
; variables.
Common Report Var(flag_move_loop_invariants) Init(1) Optimization
Move loop invariant computations out of loops
-fmudflap
-Common RejectNegative Report Var(flag_mudflap)
-Add mudflap bounds-checking instrumentation for single-threaded program
-
-fmudflapth
-Common RejectNegative Report Var(flag_mudflap,2)
-Add mudflap bounds-checking instrumentation for multi-threaded program
-
-fmudflapir
-Common RejectNegative Report Var(flag_mudflap_ignore_reads)
-Ignore read operations when inserting mudflap instrumentation
-
fdce
Common Var(flag_dce) Init(1) Optimization
Use the RTL dead code elimination pass
Common Report Var(flag_omit_frame_pointer) Optimization
When possible do not generate stack frames
+fopt-info
+Common Report Var(flag_opt_info) Optimization
+Enable all optimization info dumps on stderr
+
+fopt-info-
+Common Joined RejectNegative Var(common_deferred_options) Defer
+-fopt-info[-<type>=filename] Dump compiler optimization details
+
foptimize-register-move
Common Report Var(flag_regmove) Optimization
Do the full register move optimization pass
Enable an RTL peephole pass before sched2
fPIC
-Common Report Var(flag_pic,2)
+Common Report Var(flag_pic,2) Negative(fPIE)
Generate position-independent code if possible (large mode)
fPIE
-Common Report Var(flag_pie,2)
+Common Report Var(flag_pie,2) Negative(fpic)
Generate position-independent code for executables if possible (large mode)
fpic
-Common Report Var(flag_pic,1)
+Common Report Var(flag_pic,1) Negative(fpie)
Generate position-independent code if possible (small mode)
fpie
-Common Report Var(flag_pie,1)
+Common Report Var(flag_pie,1) Negative(fPIC)
Generate position-independent code for executables if possible (small mode)
fplugin=
Common Report Var(flag_profile_values)
Insert code to profile values of expressions
+fprofile-report
+Common Report Var(profile_report)
+Report on consistency of profile
+
frandom-seed
Common Var(common_deferred_options) Defer
Does nothing. Preserved for backward compatibility.
frounding-math
-Common Report Var(flag_rounding_math) Optimization
+Common Report Var(flag_rounding_math) Optimization SetByCombined
Disable optimizations that assume default FP rounding behavior
fsched-interblock
Does nothing. Preserved for backward compatibility.
fzee
-Common Report Var(flag_zee) Init(0)
-Eliminate redundant zero extensions on targets that support implicit extensions.
+Common Ignore
+Does nothing. Preserved for backward compatibility.
+
+free
+Common Report Var(flag_ree) Init(0)
+Turn on Redundant Extensions Elimination pass.
fshow-column
Common Report Var(flag_show_column) Init(1)
Show column numbers in diagnostics, when available. Default on
+fshrink-wrap
+Common Report Var(flag_shrink_wrap) Optimization
+Emit function prologues only before parts of the function that need it,
+rather than at the top of the function.
+
fsignaling-nans
-Common Report Var(flag_signaling_nans) Optimization
+Common Report Var(flag_signaling_nans) Optimization SetByCombined
Disable optimizations observable by IEEE signaling NaNs
fsigned-zeros
-Common Report Var(flag_signed_zeros) Init(1) Optimization
+Common Report Var(flag_signed_zeros) Init(1) Optimization SetByCombined
Disable floating point optimizations that ignore the IEEE signedness of zero
fsingle-precision-constant
Common Report Var(flag_strict_overflow)
Treat signed overflow as undefined
+fsync-libcalls
+Common Report Var(flag_sync_libcalls) Init(1)
+Implement __atomic operations via libcalls to legacy __sync functions
+
fsyntax-only
Common Report Var(flag_syntax_only)
Check for syntax errors, then stop
; (user-visible) trap. This is the case, for example, in nonstop
; IEEE 754 arithmetic.
ftrapping-math
-Common Report Var(flag_trapping_math) Init(1) Optimization
+Common Report Var(flag_trapping_math) Init(1) Optimization SetByCombined
Assume floating-point operations can trap
ftrapv
Common Report Var(flag_tree_ch) Optimization
Enable loop header copying on trees
+ftree-coalesce-inlined-vars
+Common Report Var(flag_ssa_coalesce_vars,1) Init(2) RejectNegative Optimization
+Enable coalescing of copy-related user variables that are inlined
+
+ftree-coalesce-vars
+Common Report Var(flag_ssa_coalesce_vars,2) Optimization
+Enable coalescing of all copy-related user variables
+
ftree-copyrename
Common Report Var(flag_tree_copyrename) Optimization
Replace SSA temporaries with better names in copies
Common Report Var(flag_tree_dom) Optimization
Enable dominator optimizations
+ftree-tail-merge
+Common Report Var(flag_tree_tail_merge) Optimization
+Enable tail merging on trees
+
ftree-dse
Common Report Var(flag_tree_dse) Optimization
Enable dead store elimination
Common Report Var(flag_tree_fre) Optimization
Enable Full Redundancy Elimination (FRE) on trees
+foptimize-strlen
+Common Report Var(flag_optimize_strlen) Optimization
+Enable string length optimizations on trees
+
ftree-loop-distribution
Common Report Var(flag_tree_loop_distribution) Optimization
Enable loop distribution on trees
Enable loop invariant motion on trees
ftree-loop-linear
-Common Report Var(flag_tree_loop_linear) Optimization
-Enable linear loop transforms on trees
+Common Alias(floop-interchange)
+Enable loop interchange transforms. Same as -floop-interchange
ftree-loop-ivcanon
Common Report Var(flag_tree_loop_ivcanon) Init(1) Optimization
Common Report Var(flag_tree_pre) Optimization
Enable SSA-PRE optimization on trees
+ftree-partial-pre
+Common Report Var(flag_tree_partial_pre) Optimization
+In SSA-PRE optimization on trees, enable partial-partial redundancy elimination
+
ftree-pta
Common Report Var(flag_tree_pta) Init(1) Optimization
Perform function-local points-to analysis on trees.
Common Report Var(flag_tree_sink) Optimization
Enable SSA code sinking on trees
+ftree-slsr
+Common Report Var(flag_tree_slsr) Optimization
+Perform straight-line strength reduction
+
ftree-sra
Common Report Var(flag_tree_sra) Optimization
Perform scalar replacement of aggregates
Allow loop optimizations to assume that the loops behave in normal way
fassociative-math
-Common Report Var(flag_associative_math)
+Common Report Var(flag_associative_math) SetByCombined
Allow optimization for floating-point arithmetic which may change the
result of the operation due to rounding.
freciprocal-math
-Common Report Var(flag_reciprocal_math)
+Common Report Var(flag_reciprocal_math) SetByCombined
Same as -fassociative-math for expressions which include division.
; Nonzero means that unsafe floating-point math optimizations are allowed
; are allowed to assume that their arguments and results are "normal"
; (e.g., nonnegative for SQRT).
funsafe-math-optimizations
-Common Report Var(flag_unsafe_math_optimizations) Optimization
+Common Report Var(flag_unsafe_math_optimizations) Optimization SetByCombined
Allow math optimizations that may violate IEEE or ISO standards
funswitch-loops
Common Report Var(flag_var_tracking_assignments_toggle) Optimization
Toggle -fvar-tracking-assignments
+; Positive if we should track uninitialized variables, negative if
+; we should run the var-tracking pass only to discard debug
+; annotations. When flag_var_tracking_uninit == AUTODETECT_VALUE it
+; will be set according to flag_var_tracking.
fvar-tracking-uninit
Common Report Var(flag_var_tracking_uninit) Optimization
Perform variable tracking and also tag variables that are uninitialized
Common Report Var(flag_tree_vectorize) Optimization
Enable loop vectorization on trees
+ftree-vectorizer-verbose=
+Common RejectNegative Joined UInteger Var(common_deferred_options) Defer
+-ftree-vectorizer-verbose=<number> This switch is deprecated. Use -fopt-info instead.
+
ftree-slp-vectorize
Common Report Var(flag_tree_slp_vectorize) Init(2) Optimization
Enable basic block vectorization (SLP) on trees
Common Report Var(flag_tree_vect_loop_version) Init(1) Optimization
Enable loop versioning when doing loop vectorization on trees
-ftree-vectorizer-verbose=
-Common RejectNegative Joined UInteger
--ftree-vectorizer-verbose=<number> 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.
Generate debug information in COFF format
gdwarf-
-Common Joined UInteger Var(dwarf_version) Init(2) Negative(gstabs)
+Common Joined UInteger Var(dwarf_version) Init(4) Negative(gstabs)
Generate debug information in DWARF v2 (or later) format
ggdb
Common JoinedOrMissing
Generate debug information in default extended format
+gno-pubnames
+Common RejectNegative Var(debug_generate_pub_sections, 0) Init(-1)
+Don't generate DWARF pubnames and pubtypes sections.
+
+gpubnames
+Common RejectNegative Var(debug_generate_pub_sections, 1)
+Generate DWARF pubnames and pubtypes sections.
+
+gno-record-gcc-switches
+Common RejectNegative Var(dwarf_record_gcc_switches,0) Init(1)
+Don't record gcc command line switches in DWARF DW_AT_producer.
+
+grecord-gcc-switches
+Common RejectNegative Var(dwarf_record_gcc_switches,1)
+Record gcc command line switches in DWARF DW_AT_producer.
+
+gno-split-dwarf
+Common Driver RejectNegative Var(dwarf_split_debug_info,0) Init(0)
+Don't generate debug information in separate .dwo files
+
+gsplit-dwarf
+Common Driver RejectNegative Var(dwarf_split_debug_info,1)
+Generate debug information in separate .dwo files
+
gstabs
Common JoinedOrMissing Negative(gstabs+)
Generate debug information in STABS format
Generate debug information in extended STABS format
gno-strict-dwarf
-Common RejectNegative Var(dwarf_strict,0) Init(-1)
+Common RejectNegative Var(dwarf_strict,0) Init(0)
Emit DWARF additions beyond selected version
gstrict-dwarf
Common Joined Var(plugindir_string) Init(0)
-iplugindir=<dir> Set <dir> to be the default plugin directory
+imultiarch
+Common Joined Separate RejectDriver Var(imultiarch) Init(0)
+-imultiarch <dir> Set <dir> to be the multiarch include subdirectory
+
l
Driver Joined Separate
+n
+Driver
+
no-canonical-prefixes
Driver
nodefaultlibs
Driver
+nostartfiles
+Driver
+
nostdlib
Driver
Driver Var(pass_exit_codes)
pedantic
-Common Var(pedantic)
-Issue warnings needed for strict compliance to the standard
+Common Alias(Wpedantic)
pedantic-errors
Common Var(flag_pedantic_errors)
print-multi-os-directory
Driver Var(print_multi_os_directory)
+
+print-multiarch
+Driver Var(print_multiarch)
print-prog-name=
Driver JoinedOrMissing Var(print_prog_name)
Common Var(quiet_flag) RejectDriver
Do not display functions compiled or elapsed time
+r
+Driver
+
+s
+Driver
+
save-temps
Driver
save-temps=
Driver Joined
+t
+Driver
+
time
Driver Var(report_times)
Driver Joined Separate
shared
-Common RejectNegative Negative(pie)
+Driver RejectNegative Negative(pie)
Create a shared library
shared-libgcc
static-libstdc++
Driver
+static-libgo
+Driver
+; Documented for Go, but always accepted by driver.
+
+static-libasan
+Driver
+
symbolic
Driver
pie
-Common RejectNegative Negative(shared)
+Driver RejectNegative Negative(shared)
Create a position independent executable
z
projects / gcc.git / blobdiff