; Options for the language- and target-independent parts of the compiler.
-; Copyright (C) 2003-2019 Free Software Foundation, Inc.
+; Copyright (C) 2003-2022 Free Software Foundation, Inc.
;
; This file is part of GCC.
;
bool in_lto_p = false
; This variable is set to non-0 only by LTO front-end. 1 indicates that
-; the output produced will be used for incrmeental linking (thus weak symbols
+; the output produced will be used for incremental linking (thus weak symbols
; can still be bound) and 2 indicates that the IL is going to be linked and
; and output to LTO object file.
Variable
Variable
int flag_complex_method = 1
+Variable
+int flag_default_complex_method = 1
+
; Language specific warning pass for unused results.
Variable
bool flag_warn_unused_result = false
Variable
int flag_shlib
-; These two are really VEC(char_p,heap) *.
+; These three are really VEC(char_p,heap) *.
Variable
void *flag_instrument_functions_exclude_functions
Variable
void *flag_instrument_functions_exclude_files
+Variable
+void *flag_ignored_attributes
+
; Generic structs (e.g. templates not explicitly specialized)
; may not have a compilation unit associated with them, and so
; may need to be treated differently from ordinary structs.
; flag-types.h for the definitions of the different possible types of
; debugging information.
Variable
-enum debug_info_type write_symbols = NO_DEBUG
+uint32_t write_symbols = NO_DEBUG
; Level of debugging information we are producing. See flag-types.h
; for the definitions of the different possible levels.
Variable
bool use_gnu_debug_info_extensions
+; Level of CTF debugging information we are producing. See flag-types.h
+; for the definitions of the different possible levels.
+Variable
+enum ctf_debug_info_levels ctf_debug_info_level = CTFINFO_LEVEL_NONE
+
; Original value of maximum field alignment in bytes, specified via
; -fpack-struct=<value>.
Variable
Variable
int flag_debug_asm
-; How many NOP insns to place at each function entry by default
-Variable
-HOST_WIDE_INT function_entry_patch_area_size
-
-; And how far the real asm entry point is into this area
-Variable
-HOST_WIDE_INT function_entry_patch_area_start
-
; Balance between GNAT encodings and standard DWARF to emit.
Variable
enum dwarf_gnat_encodings gnat_encodings = DWARF_GNAT_ENCODINGS_DEFAULT
Variable
int main_input_baselength
+; The base name used for auxiliary output files.
+; dump_base_name minus dump_base_ext.
+
+Variable
+const char *aux_base_name
+
; Which options have been printed by --help.
Variable
char *help_printed
; What sanitizers should recover from errors
Variable
-unsigned int flag_sanitize_recover = (SANITIZE_UNDEFINED | SANITIZE_UNDEFINED_NONDEFAULT | SANITIZE_KERNEL_ADDRESS) & ~(SANITIZE_UNREACHABLE | SANITIZE_RETURN)
+unsigned int flag_sanitize_recover = (SANITIZE_UNDEFINED | SANITIZE_UNDEFINED_NONDEFAULT | SANITIZE_KERNEL_ADDRESS | SANITIZE_KERNEL_HWADDRESS) & ~(SANITIZE_UNREACHABLE | SANITIZE_RETURN)
; What the coverage sanitizers should instrument
Variable
Variable
bool dump_base_name_prefixed = false
-; Flag whether HSA generation has been explicitely disabled
+; What subset of registers should be zeroed on function return
Variable
-bool flag_disable_hsa = false
+unsigned int flag_zero_call_used_regs
###
Driver
Common Joined Alias(d)
-dumpbase
-Common Separate Alias(dumpbase)
+Driver Common Separate Alias(dumpbase)
+
+-dumpbase-ext
+Driver Common Separate Alias(dumpbase-ext)
-dumpdir
-Common Separate Alias(dumpdir)
+Driver Common Separate Alias(dumpdir)
-entry
Driver Separate Alias(e)
Display this information.
-help=
-Common Driver Report Joined
+Common Driver Joined
--help=<class> Display descriptions of a specific class of options. <class> is one or more of optimizers, target, warnings, undocumented, params.
-language
Common Optimization
Optimize for debugging experience rather than speed or size.
+Oz
+Common Optimization
+Optimize for space aggressively rather than speed.
+
Q
Driver
Common Joined RejectNegative UInteger Var(warn_array_bounds) Warning IntegerRange(0, 2)
Warn if an array is accessed out of bounds.
+Wuse-after-free
+Common Var(warn_use_after_free) Warning
+Warn for uses of pointers to deallocated strorage.
+
+Wuse-after-free=
+Common Joined RejectNegative UInteger Var(warn_use_after_free) Warning IntegerRange(0, 3)
+Warn for uses of pointers to deallocated strorage.
+
Wattributes
Common Var(warn_attributes) Init(1) Warning
Warn about inappropriate attribute usage.
+Wattributes=
+Common Joined
+Do not warn about specified attributes.
+
Wattribute-alias
Common Alias(Wattribute_alias=, 1, 0) Warning
Warn about type safety and similar errors and mismatches in declarations with alias attributes.
Common RejectNegative Joined Host_Wide_Int ByteSize Warning Var(warn_frame_larger_than_size) Init(HOST_WIDE_INT_MAX)
-Wframe-larger-than=<byte-size> Warn if a function's stack frame requires in excess of <byte-size>.
+Wno-frame-larger-than
+Common Alias(Wframe-larger-than=,18446744073709551615EiB,none) Warning
+Disable -Wframe-larger-than= warning. Equivalent to -Wframe-larger-than=<SIZE_MAX> or larger.
+
Wfree-nonheap-object
Common Var(warn_free_nonheap_object) Init(1) Warning
Warn when attempting to free a non-heap object.
Whsa
-Common Var(warn_hsa) Init(1) Warning
-Warn when a function cannot be expanded to HSAIL.
+Common Ignore Warning
+Does nothing. Preserved for backward compatibility.
Wimplicit-fallthrough
Common Alias(Wimplicit-fallthrough=,3,0) Warning
Common Var(warn_implicit_fallthrough) RejectNegative Joined UInteger Warning IntegerRange(0, 5)
Warn when a switch case falls through.
+Winfinite-recursion
+Var(warn_infinite_recursion) Warning
+Warn for infinitely recursive calls.
+
Winline
-Common Var(warn_inline) Warning
+Common Var(warn_inline) Warning Optimization
Warn when an inlined function cannot be inlined.
Winvalid-memory-model
Common RejectNegative Joined Host_Wide_Int ByteSize Warning Var(warn_larger_than_size) Init(HOST_WIDE_INT_MAX)
-Wlarger-than=<byte-size> Warn if an object's size exceeds <byte-size>.
+Wno-larger-than
+Common Alias(Wlarger-than=,18446744073709551615EiB,none) Warning
+Disable -Wlarger-than= warning. Equivalent to -Wlarger-than=<SIZE_MAX> or larger.
+
Wnonnull-compare
Var(warn_nonnull_compare) Warning
Warn if comparing pointer parameter with nonnull attribute with NULL.
Common Joined RejectNegative Host_Wide_Int ByteSize Var(warn_stack_usage) Warning Init(HOST_WIDE_INT_MAX)
-Wstack-usage=<byte-size> Warn if stack usage might exceed <byte-size>.
+Wno-stack-usage
+Common Alias(Wstack-usage=,18446744073709551615EiB,none) Warning
+Disable Wstack-usage= warning. Equivalent to Wstack-usage=<SIZE_MAX> or larger.
+
Wstrict-aliasing
Common Warning
Warn about code which might break strict aliasing rules.
Common Var(warn_coverage_mismatch) Init(1) Warning
Warn in case profiles in -fprofile-use do not match.
+Wcoverage-invalid-line-number
+Common Var(warn_coverage_invalid_linenum) Init(1) Warning
+Warn in case a function ends earlier than it begins due to an invalid linenum macros.
+
Wmissing-profile
Common Var(warn_missing_profile) Init(1) Warning
Warn in case profiles in -fprofile-use do not exist.
Common Var(warn_vector_operation_performance) Warning
Warn when a vector operation is compiled outside the SIMD.
+Wtsan
+Common Var(warn_tsan) Init(1) Warning
+Warn about unsupported features in ThreadSanitizer.
+
Xassembler
Driver Separate
aux-info=
Common Joined Alias(aux-info)
-auxbase
-Common Separate RejectDriver Var(aux_base_name)
-
-auxbase-strip
-Common Separate RejectDriver
-
coverage
Driver
-d<letters> Enable dumps from specific passes of the compiler.
dumpbase
-Common Separate Var(dump_base_name)
+Driver Common Separate Var(dump_base_name)
-dumpbase <file> Set the file basename to be used for dumps.
+dumpbase-ext
+Driver Common Separate Var(dump_base_ext)
+-dumpbase-ext .<ext> Drop a trailing .<ext> from the dump basename to name auxiliary output files.
+
dumpdir
-Common Separate Var(dump_dir_name)
+Driver Common Separate Var(dump_dir_name)
-dumpdir <dir> Set the directory name to be used for dumps.
dumpmachine
; 13: Fixes the accidental change in 12 to the calling convention for classes
; with deleted copy constructor and trivial move constructor.
; Default in G++ 8.2.
+;
; 14: Corrects the mangling of nullptr expression.
; Default in G++ 10.
;
+; 15: Corrects G++ 10 ABI tag regression [PR98481].
+; Available, but not default, in G++ 10.3.
+;
+; 16: Changes the mangling of __alignof__ to be distinct from that of alignof.
+; Adds missing 'on' in mangling of operator names in some cases.
+; Default in G++ 11.
+;
+; 17: Fixes layout of classes that inherit from aggregate classes with default
+; member initializers in C++14 and up.
+; Default in G++ 12.
+;
; Additional positive integers will be assigned as new versions of
; the ABI become the default version of the ABI.
fabi-version=
The version of the C++ ABI in use.
faggressive-loop-optimizations
-Common Report Var(flag_aggressive_loop_optimizations) Optimization Init(1)
+Common Var(flag_aggressive_loop_optimizations) Optimization Init(1)
Aggressively optimize loops using language constraints.
falign-functions
-Common Report Var(flag_align_functions) Optimization
+Common Var(flag_align_functions) Optimization
Align the start of functions.
falign-functions=
Common RejectNegative Joined Var(str_align_functions) Optimization
flimit-function-alignment
-Common Report Var(flag_limit_function_alignment) Optimization Init(0)
+Common Var(flag_limit_function_alignment) Optimization Init(0)
falign-jumps
-Common Report Var(flag_align_jumps) Optimization
+Common Var(flag_align_jumps) Optimization
Align labels which are only reached by jumping.
falign-jumps=
Common RejectNegative Joined Var(str_align_jumps) Optimization
falign-labels
-Common Report Var(flag_align_labels) Optimization
+Common Var(flag_align_labels) Optimization
Align all labels.
falign-labels=
Common RejectNegative Joined Var(str_align_labels) Optimization
falign-loops
-Common Report Var(flag_align_loops) Optimization
+Common Var(flag_align_loops) Optimization
Align the start of loops.
falign-loops=
Common RejectNegative Joined Var(str_align_loops) Optimization
fallow-store-data-races
-Common Report Var(flag_store_data_races) Optimization
+Common Var(flag_store_data_races) Optimization
Allow the compiler to introduce new data races on stores.
+fanalyzer
+Common Var(flag_analyzer)
+Enable static analysis pass.
+
fargument-alias
Common Ignore
Does nothing. Preserved for backward compatibility.
Does nothing. Preserved for backward compatibility.
fsanitize=
-Common Driver Report Joined
+Common Driver Joined
Select what to sanitize.
fsanitize-coverage=
-Common Report Joined
+Common Joined RejectNegative Enum(sanitize_coverage)
Select type of coverage sanitization.
+Enum
+Name(sanitize_coverage) Type(int)
+
+EnumValue
+Enum(sanitize_coverage) String(trace-pc) Value(SANITIZE_COV_TRACE_PC)
+
+EnumValue
+Enum(sanitize_coverage) String(trace-cmp) Value(SANITIZE_COV_TRACE_CMP)
+
fasan-shadow-offset=
Common Joined RejectNegative Var(common_deferred_options) Defer
-fasan-shadow-offset=<number> Use custom shadow memory offset.
in user-defined sections.
fsanitize-recover=
-Common Report Joined
+Common Joined
After diagnosing undefined behavior attempt to continue execution.
fsanitize-recover
-Common Report
+Common
This switch is deprecated; use -fsanitize-recover= instead.
fsanitize-address-use-after-scope
-Common Driver Report Var(flag_sanitize_address_use_after_scope) Init(0)
+Common Driver Var(flag_sanitize_address_use_after_scope) Init(0)
fsanitize-undefined-trap-on-error
-Common Driver Report Var(flag_sanitize_undefined_trap_on_error) Init(0)
+Common Driver Var(flag_sanitize_undefined_trap_on_error) Init(0)
Use trap instead of a library function for undefined behavior sanitization.
fasynchronous-unwind-tables
-Common Report Var(flag_asynchronous_unwind_tables) Optimization
+Common Var(flag_asynchronous_unwind_tables) Optimization
Generate unwind tables that are exact at each instruction boundary.
fauto-inc-dec
-Common Report Var(flag_auto_inc_dec) Init(1) Optimization
+Common Var(flag_auto_inc_dec) Init(1) Optimization
Generate auto-inc/dec instructions.
fauto-profile
-Common Report Var(flag_auto_profile)
+Common Var(flag_auto_profile)
Use sample profile information for call graph node weights. The default
profile file is fbdata.afdo in 'pwd'.
; For Java: defaults to on.
; For Fortran: defaults to off.
fbounds-check
-Common Report Var(flag_bounds_check)
+Common Var(flag_bounds_check)
Generate code to check bounds before indexing arrays.
fbranch-count-reg
-Common Report Var(flag_branch_on_count_reg) Optimization
+Common Var(flag_branch_on_count_reg) Optimization
Replace add, compare, branch with branch on count register.
fbranch-probabilities
-Common Report Var(flag_branch_probabilities) Optimization
+Common Var(flag_branch_probabilities) Optimization
Use profiling information for branch probabilities.
fbranch-target-load-optimize
Does nothing. Preserved for backward compatibility.
fcallgraph-info
-Common Report RejectNegative Var(flag_callgraph_info) Init(NO_CALLGRAPH_INFO);
+Common RejectNegative Var(flag_callgraph_info) Init(NO_CALLGRAPH_INFO);
Output callgraph information on a per-file basis.
fcallgraph-info=
-Common Report RejectNegative Joined
+Common RejectNegative Joined
Output callgraph information on a per-file basis with decorations.
fcall-saved-
; be saved across function calls, if that produces overall better code.
; Optional now, so people can test it.
fcaller-saves
-Common Report Var(flag_caller_saves) Optimization
+Common Var(flag_caller_saves) Optimization
Save registers around function calls.
fcheck-data-deps
Perform internal consistency checkings.
fcode-hoisting
-Common Report Var(flag_code_hoisting) Optimization
+Common Var(flag_code_hoisting) Optimization
Enable code hoisting.
fcombine-stack-adjustments
-Common Report Var(flag_combine_stack_adjustments) Optimization
+Common Var(flag_combine_stack_adjustments) Optimization
Looks for opportunities to reduce stack adjustments and stack references.
fcommon
-Common Report Var(flag_no_common,0)
+Common Var(flag_no_common,0) Init(1)
Put uninitialized globals in the common section.
fcompare-debug
Run only the second compilation of -fcompare-debug.
fcompare-elim
-Common Report Var(flag_compare_elim_after_reload) Optimization
+Common Var(flag_compare_elim_after_reload) Optimization
Perform comparison elimination after register allocation has finished.
fconserve-stack
Do not perform optimizations increasing noticeably stack usage.
fcprop-registers
-Common Report Var(flag_cprop_registers) Optimization
+Common Var(flag_cprop_registers) Optimization
Perform a register copy-propagation optimization pass.
fcrossjumping
-Common Report Var(flag_crossjumping) Optimization
+Common Var(flag_crossjumping) Optimization
Perform cross-jumping optimization.
fcse-follow-jumps
-Common Report Var(flag_cse_follow_jumps) Optimization
+Common Var(flag_cse_follow_jumps) Optimization
When running CSE, follow jumps to their targets.
fcse-skip-blocks
Does nothing. Preserved for backward compatibility.
fcx-limited-range
-Common Report Var(flag_cx_limited_range) Optimization SetByCombined
+Common Var(flag_cx_limited_range) Optimization SetByCombined
Omit range reduction step when performing complex division.
fcx-fortran-rules
-Common Report Var(flag_cx_fortran_rules) Optimization
+Common Var(flag_cx_fortran_rules) Optimization
Complex multiplication and division follow Fortran rules.
fdata-sections
-Common Report Var(flag_data_sections)
+Common Var(flag_data_sections)
Place data items into their own section.
fdbg-cnt-list
-Common Report Var(common_deferred_options) Defer
+Common Var(flag_dbg_cnt_list)
List all available debugging counters with their limits and counts.
fdbg-cnt=
Common RejectNegative Joined Var(common_deferred_options) Defer
--fdbg-cnt=<counter>[:<lower_limit>]:<upper_limit>[,<counter>:...] Set the debug counter limit.
+-fdbg-cnt=<counter>[:<lower_limit1>-]<upper_limit1>[:<lower_limit2>-<upper_limit2>:...][,<counter>:...] Set the debug counter limit.
fdebug-prefix-map=
Common Joined RejectNegative Var(common_deferred_options) Defer
--fdebug-prefix-map=<old>=<new> Map one directory name to another in debug information.
+-fdebug-prefix-map=<old>=<new> Map one directory name to another in debug information.
ffile-prefix-map=
Common Joined RejectNegative Var(common_deferred_options) Defer
--ffile-prefix-map=<old>=<new> Map one directory name to another in compilation result.
+-ffile-prefix-map=<old>=<new> Map one directory name to another in compilation result.
fdebug-types-section
-Common Report Var(flag_debug_types_section) Init(0)
+Common 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_defer_pop) Optimization
+Common Var(flag_defer_pop) Optimization
Defer popping functions args from stack until later.
fdelayed-branch
-Common Report Var(flag_delayed_branch) Optimization
+Common 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) Optimization
+Common Var(flag_delete_dead_exceptions) Init(0) Optimization
Delete dead instructions that may throw exceptions.
fdelete-null-pointer-checks
-Common Report Var(flag_delete_null_pointer_checks) Init(-1) Optimization
+Common Var(flag_delete_null_pointer_checks) Init(-1) Optimization
Delete useless null pointer checks.
fdevirtualize-at-ltrans
-Common Report Var(flag_ltrans_devirtualize)
+Common Var(flag_ltrans_devirtualize)
Stream extra data to support more aggressive devirtualization in LTO local transformation mode.
fdevirtualize-speculatively
-Common Report Var(flag_devirtualize_speculatively) Optimization
+Common Var(flag_devirtualize_speculatively) Optimization
Perform speculative devirtualization.
fdevirtualize
-Common Report Var(flag_devirtualize) Optimization
+Common Var(flag_devirtualize) Optimization
Try to convert virtual calls to direct ones.
fdiagnostics-show-location=
EnumValue
Enum(diagnostic_url_rule) String(auto) Value(DIAGNOSTICS_URL_AUTO)
+fdiagnostics-column-unit=
+Common Joined RejectNegative Enum(diagnostics_column_unit)
+-fdiagnostics-column-unit=[display|byte] Select whether column numbers are output as display columns (default) or raw bytes.
+
+fdiagnostics-column-origin=
+Common Joined RejectNegative UInteger
+-fdiagnostics-column-origin=<number> Set the number of the first column. The default is 1-based as per GNU style, but some utilities may expect 0-based, for example.
+
fdiagnostics-format=
Common Joined RejectNegative Enum(diagnostics_output_format)
--fdiagnostics-format=[text|json] Select output format.
+-fdiagnostics-format=[text|json] Select output format.
+
+fdiagnostics-escape-format=
+Common Joined RejectNegative Enum(diagnostics_escape_format)
+-fdiagnostics-escape-format=[unicode|bytes] Select how to escape non-printable-ASCII bytes in the source for diagnostics that suggest it.
; Required for these enum values.
SourceInclude
diagnostic.h
+Enum
+Name(diagnostics_column_unit) Type(int)
+
+EnumValue
+Enum(diagnostics_column_unit) String(display) Value(DIAGNOSTICS_COLUMN_UNIT_DISPLAY)
+
+EnumValue
+Enum(diagnostics_column_unit) String(byte) Value(DIAGNOSTICS_COLUMN_UNIT_BYTE)
+
+Enum
+Name(diagnostics_escape_format) Type(int)
+
+EnumValue
+Enum(diagnostics_escape_format) String(unicode) Value(DIAGNOSTICS_ESCAPE_FORMAT_UNICODE)
+
+EnumValue
+Enum(diagnostics_escape_format) String(bytes) Value(DIAGNOSTICS_ESCAPE_FORMAT_BYTES)
+
Enum
Name(diagnostics_output_format) Type(int)
Common Var(flag_diagnostics_show_option) Init(1)
Amend appropriate diagnostic messages with the command line option that controls them.
+fdiagnostics-show-cwe
+Common Var(flag_diagnostics_show_cwe) Init(1)
+Print CWE identifiers for diagnostic messages, where available.
+
+fdiagnostics-path-format=
+Common Joined RejectNegative Var(flag_diagnostics_path_format) Enum(diagnostic_path_format) Init(DPF_INLINE_EVENTS)
+Specify how to print any control-flow path associated with a diagnostic.
+
+fdiagnostics-plain-output
+Driver Common RejectNegative
+Turn off any diagnostics features that complicate the output, such as line numbers, color, and warning URLs.
+
+ftabstop=
+Common Joined RejectNegative UInteger
+-ftabstop=<number> Distance between tab stops for column reporting.
+
+Enum
+Name(diagnostic_path_format) Type(int)
+
+EnumValue
+Enum(diagnostic_path_format) String(none) Value(DPF_NONE)
+
+EnumValue
+Enum(diagnostic_path_format) String(separate-events) Value(DPF_SEPARATE_EVENTS)
+
+EnumValue
+Enum(diagnostic_path_format) String(inline-events) Value(DPF_INLINE_EVENTS)
+
+fdiagnostics-show-path-depths
+Common Var(flag_diagnostics_show_path_depths) Init(0)
+Show stack depths of events in paths.
+
fdiagnostics-minimum-margin-width=
Common Joined UInteger Var(diagnostics_minimum_margin_width) Init(6)
Set minimum width of left margin of source code when showing source.
fdisable-
Common Joined RejectNegative Var(common_deferred_options) Defer
--fdisable-[tree|rtl|ipa]-<pass>=range1+range2 disables an optimization pass.
+-fdisable-[tree|rtl|ipa]-<pass>=range1+range2 Disable an optimization pass.
fenable-
Common Joined RejectNegative Var(common_deferred_options) Defer
--fenable-[tree|rtl|ipa]-<pass>=range1+range2 enables an optimization pass.
+-fenable-[tree|rtl|ipa]-<pass>=range1+range2 Enable an optimization pass.
fdump-
Common Joined RejectNegative Var(common_deferred_options) Defer
-fdump-go-spec=filename Write all declarations to file as Go code.
fdump-noaddr
-Common Report Var(flag_dump_noaddr)
+Common Var(flag_dump_noaddr)
Suppress output of addresses in debugging dumps.
freport-bug
Dump optimization passes.
fdump-unnumbered
-Common Report Var(flag_dump_unnumbered)
+Common Var(flag_dump_unnumbered)
Suppress output of instruction numbers, line number notes and addresses in debugging dumps.
fdump-unnumbered-links
-Common Report Var(flag_dump_unnumbered_links)
+Common Var(flag_dump_unnumbered_links)
Suppress output of previous and next insn numbers in debugging dumps.
fdwarf2-cfi-asm
-Common Report Var(flag_dwarf2_cfi_asm) Init(HAVE_GAS_CFI_DIRECTIVE)
+Common Var(flag_dwarf2_cfi_asm) Init(HAVE_GAS_CFI_DIRECTIVE)
Enable CFI tables via GAS assembler directives.
fearly-inlining
-Common Report Var(flag_early_inlining) Init(1) Optimization
+Common Var(flag_early_inlining) Init(1) Optimization
Perform early inlining.
feliminate-dwarf2-dups
Does nothing. Preserved for backward compatibility.
fipa-sra
-Common Report Var(flag_ipa_sra) Init(0) Optimization
+Common Var(flag_ipa_sra) Init(0) Optimization
Perform interprocedural reduction of aggregates.
feliminate-unused-debug-symbols
-Common Report Var(flag_debug_only_used_symbols) Init(1)
+Common Var(flag_debug_only_used_symbols) Init(1)
Perform unused symbol elimination in debug info.
feliminate-unused-debug-types
-Common Report Var(flag_eliminate_unused_debug_types) Init(1)
+Common Var(flag_eliminate_unused_debug_types) Init(1)
Perform unused type elimination in debug info.
femit-class-debug-always
-Common Report Var(flag_emit_class_debug_always) Init(0)
+Common Var(flag_emit_class_debug_always) Init(0)
Do not suppress C++ class debug information.
fexceptions
-Common Report Var(flag_exceptions) Optimization
+Common Var(flag_exceptions) Optimization EnabledBy(fnon-call-exceptions)
Enable exception handling.
fexpensive-optimizations
-Common Report Var(flag_expensive_optimizations) Optimization
+Common Var(flag_expensive_optimizations) Optimization
Perform a number of minor, expensive optimizations.
fexcess-precision=
Common Joined RejectNegative Enum(excess_precision) Var(flag_excess_precision) Init(EXCESS_PRECISION_DEFAULT) Optimization SetByCombined
--fexcess-precision=[fast|standard] Specify handling of excess floating-point precision.
+-fexcess-precision=[fast|standard|16] Specify handling of excess floating-point precision.
Enum
Name(excess_precision) Type(enum excess_precision) UnknownError(unknown excess precision style %qs)
EnumValue
Enum(excess_precision) String(standard) Value(EXCESS_PRECISION_STANDARD)
+EnumValue
+Enum(excess_precision) String(16) Value(EXCESS_PRECISION_FLOAT16)
+
; Whether we permit the extended set of values for FLT_EVAL_METHOD
; introduced in ISO/IEC TS 18661-3, or limit ourselves to those in C99/C11.
fpermitted-flt-eval-methods=
Output lto objects containing both the intermediate language and binary output.
ffinite-math-only
-Common Report Var(flag_finite_math_only) Optimization SetByCombined
+Common Var(flag_finite_math_only) Optimization SetByCombined
Assume no NaNs or infinities are generated.
ffinite-loops
-Common Report Var(flag_finite_loops) Optimization
+Common Var(flag_finite_loops) Optimization Init(0)
Assume that loops with an exit will terminate and not loop indefinitely.
ffixed-
-ffixed-<register> Mark <register> as being unavailable to the compiler.
ffloat-store
-Common Report Var(flag_float_store) Optimization
+Common Var(flag_float_store) Optimization
Don't allocate floats and doubles in extended-precision registers.
fforce-addr
Does nothing. Preserved for backward compatibility.
fforward-propagate
-Common Report Var(flag_forward_propagate) Optimization
+Common Var(flag_forward_propagate) Optimization
Perform a forward propagation pass on RTL.
ffp-contract=
Enum(fp_contract_mode) String(fast) Value(FP_CONTRACT_FAST)
ffp-int-builtin-inexact
-Common Report Var(flag_fp_int_builtin_inexact) Init(1) Optimization
+Common Var(flag_fp_int_builtin_inexact) Init(1) Optimization
Allow built-in functions ceil, floor, round, trunc to raise \"inexact\" exceptions.
; 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) Optimization
+Common Var(flag_no_function_cse,0) Optimization
Allow function addresses to be held in registers.
ffunction-sections
-Common Report Var(flag_function_sections)
+Common Var(flag_function_sections)
Place each function into its own section.
fgcse
-Common Report Var(flag_gcse) Optimization
+Common Var(flag_gcse) Optimization
Perform global common subexpression elimination.
fgcse-lm
-Common Report Var(flag_gcse_lm) Init(1) Optimization
+Common Var(flag_gcse_lm) Init(1) Optimization
Perform enhanced load motion during global common subexpression elimination.
fgcse-sm
-Common Report Var(flag_gcse_sm) Init(0) Optimization
+Common Var(flag_gcse_sm) Init(0) Optimization
Perform store motion after global common subexpression elimination.
fgcse-las
-Common Report Var(flag_gcse_las) Init(0) Optimization
+Common Var(flag_gcse_las) Init(0) Optimization
Perform redundant load after store elimination in global common subexpression
elimination.
fgcse-after-reload
-Common Report Var(flag_gcse_after_reload) Optimization
+Common Var(flag_gcse_after_reload) Optimization
Perform global common subexpression elimination after register allocation has
finished.
Enum(dwarf_gnat_encodings) String(minimal) Value(DWARF_GNAT_ENCODINGS_MINIMAL)
fgnat-encodings=
-Common Enum(dwarf_gnat_encodings) Joined RejectNegative Report Undocumented Var(gnat_encodings)
+Common Enum(dwarf_gnat_encodings) Joined RejectNegative Undocumented Var(gnat_encodings)
-fgnat-encodings=[all|gdb|minimal] Select the balance between GNAT encodings and standard DWARF emitted in the debug information.
; This option is not documented yet as its semantics will change.
fgraphite
-Common Report Var(flag_graphite) Optimization
+Common Var(flag_graphite) Optimization
Enable in and out of Graphite representation.
fgraphite-identity
-Common Report Var(flag_graphite_identity) Optimization
+Common Var(flag_graphite_identity) Optimization
Enable Graphite Identity transformation.
fhoist-adjacent-loads
-Common Report Var(flag_hoist_adjacent_loads) Optimization
+Common Var(flag_hoist_adjacent_loads) Optimization
Enable hoisting adjacent loads to encourage generating conditional move
instructions.
fkeep-gc-roots-live
-Common Undocumented Report Var(flag_keep_gc_roots_live) Optimization
+Common Undocumented Var(flag_keep_gc_roots_live) Optimization
; Always keep a pointer to a live memory block
+flarge-source-files
+Common Var(flag_large_source_files) Init(0)
+Improve GCC's ability to track column numbers in large source files,
+at the expense of slower compilation.
+
floop-parallelize-all
-Common Report Var(flag_loop_parallelize_all) Optimization
+Common Var(flag_loop_parallelize_all) Optimization
Mark all loops as parallel.
floop-strip-mine
Enable loop nest transforms. Same as -floop-nest-optimize.
floop-interchange
-Common Report Var(flag_loop_interchange) Optimization
+Common Var(flag_loop_interchange) Optimization
Enable loop interchange on trees.
floop-block
Enable loop nest transforms. Same as -floop-nest-optimize.
floop-unroll-and-jam
-Common Report Var(flag_unroll_jam) Optimization
+Common Var(flag_unroll_jam) Optimization
Perform unroll-and-jam on loops.
fgnu-tm
-Common Report Var(flag_tm)
+Common Var(flag_tm)
Enable support for GNU transactional memory.
fgnu-unique
-Common Report Var(flag_gnu_unique) Init(1)
+Common Var(flag_gnu_unique) Init(1)
Use STB_GNU_UNIQUE if supported by the assembler.
floop-flatten
Does nothing. Preserved for backward compatibility.
floop-nest-optimize
-Common Report Var(flag_loop_nest_optimize) Optimization
+Common Var(flag_loop_nest_optimize) Optimization
Enable the loop nest optimizer.
fstrict-volatile-bitfields
-Common Report Var(flag_strict_volatile_bitfields) Init(-1) Optimization
+Common Var(flag_strict_volatile_bitfields) Init(-1) Optimization
Force bitfield accesses to match their type width.
fstore-merging
-Common Report Var(flag_store_merging) Optimization
+Common Var(flag_store_merging) Optimization
Merge adjacent stores.
fguess-branch-probability
-Common Report Var(flag_guess_branch_prob) Optimization
+Common Var(flag_guess_branch_prob) Optimization
Enable guessing of branch probabilities.
+fharden-compares
+Common Var(flag_harden_compares) Optimization
+Harden conditionals not used in branches, checking reversed conditions.
+
+fharden-conditional-branches
+Common Var(flag_harden_conditional_branches) Optimization
+Harden conditional branches by checking reversed conditions.
+
; 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)
+Common Var(flag_no_ident,0)
Process #ident directives.
fif-conversion
-Common Report Var(flag_if_conversion) Optimization
+Common Var(flag_if_conversion) Optimization
Perform conversion of conditional jumps to branchless equivalents.
fif-conversion2
-Common Report Var(flag_if_conversion2) Optimization
+Common Var(flag_if_conversion2) Optimization
Perform conversion of conditional jumps to conditional execution.
fstack-reuse=
Enum(stack_reuse_level) String(none) Value(SR_NONE)
ftree-loop-if-convert
-Common Report Var(flag_tree_loop_if_convert) Init(-1) Optimization
+Common Var(flag_tree_loop_if_convert) Init(-1) Optimization
Convert conditional jumps in innermost loops to branchless equivalents.
ftree-loop-if-convert-stores
; 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)
+Common Var(flag_inhibit_size_directive)
Do not generate .size directives.
findirect-inlining
-Common Report Var(flag_indirect_inlining) Optimization
+Common Var(flag_indirect_inlining) Optimization
Perform indirect inlining.
; 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) Optimization
+Common 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
+Common Var(flag_inline_small_functions) Optimization
Integrate functions into their callers when code size is known not to grow.
finline-functions
-Common Report Var(flag_inline_functions) Optimization
+Common Var(flag_inline_functions) Optimization
Integrate functions not declared \"inline\" into their callers when profitable.
finline-functions-called-once
-Common Report Var(flag_inline_functions_called_once) Optimization
+Common Var(flag_inline_functions_called_once) Optimization
Integrate functions only required by their single caller.
finline-limit-
-finline-limit=<number> Limit the size of inlined functions to <number>.
finline-atomics
-Common Report Var(flag_inline_atomics) Init(1) Optimization
+Common Var(flag_inline_atomics) Init(1) Optimization
Inline __atomic operations when a lock free instruction sequence is available.
fcf-protection
Common RejectNegative Alias(fcf-protection=,full)
fcf-protection=
-Common Report Joined RejectNegative Enum(cf_protection_level) Var(flag_cf_protection) Init(CF_NONE)
--fcf-protection=[full|branch|return|none] Instrument functions with checks to verify jump/call/return control-flow transfer
+Common Joined RejectNegative Enum(cf_protection_level) Var(flag_cf_protection) Init(CF_NONE)
+-fcf-protection=[full|branch|return|none|check] Instrument functions with checks to verify jump/call/return control-flow transfer
instructions have valid targets.
Enum
EnumValue
Enum(cf_protection_level) String(return) Value(CF_RETURN)
+EnumValue
+Enum(cf_protection_level) String(check) Value(CF_CHECK)
+
EnumValue
Enum(cf_protection_level) String(none) Value(CF_NONE)
finstrument-functions
-Common Report Var(flag_instrument_function_entry_exit)
+Common 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-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.
+-finstrument-functions-exclude-file-list=filename,... Do not instrument functions listed in files.
fipa-cp
-Common Report Var(flag_ipa_cp) Optimization
+Common Var(flag_ipa_cp) Optimization
Perform interprocedural constant propagation.
fipa-cp-clone
-Common Report Var(flag_ipa_cp_clone) Optimization
+Common Var(flag_ipa_cp_clone) Optimization
Perform cloning to make Interprocedural constant propagation stronger.
fipa-cp-alignment
Does nothing. Preserved for backward compatibility.
fipa-bit-cp
-Common Report Var(flag_ipa_bit_cp) Optimization
+Common Var(flag_ipa_bit_cp) Optimization
Perform interprocedural bitwise constant propagation.
+fipa-modref
+Common Var(flag_ipa_modref) Optimization
+Perform interprocedural modref analysis.
+
fipa-profile
-Common Report Var(flag_ipa_profile) Init(0) Optimization
+Common Var(flag_ipa_profile) Init(0) Optimization
Perform interprocedural profile propagation.
fipa-pta
-Common Report Var(flag_ipa_pta) Init(0) Optimization
+Common Var(flag_ipa_pta) Init(0) Optimization
Perform interprocedural points-to analysis.
fipa-pure-const
-Common Report Var(flag_ipa_pure_const) Init(0) Optimization
+Common Var(flag_ipa_pure_const) Init(0) Optimization
Discover pure and const functions.
fipa-icf
-Common Report Var(flag_ipa_icf) Optimization
+Common Var(flag_ipa_icf) Optimization
Perform Identical Code Folding for functions and read-only variables.
fipa-icf-functions
-Common Report Var(flag_ipa_icf_functions) Optimization
+Common Var(flag_ipa_icf_functions) Optimization
Perform Identical Code Folding for functions.
fipa-icf-variables
-Common Report Var(flag_ipa_icf_variables) Optimization
+Common Var(flag_ipa_icf_variables) Optimization
Perform Identical Code Folding for variables.
fipa-reference
-Common Report Var(flag_ipa_reference) Init(0) Optimization
+Common Var(flag_ipa_reference) Init(0) Optimization
Discover read-only and non addressable static variables.
fipa-reference-addressable
-Common Report Var(flag_ipa_reference_addressable) Init(0) Optimization
+Common Var(flag_ipa_reference_addressable) Init(0) Optimization
Discover read-only, write-only and non-addressable static variables.
fipa-stack-alignment
-Common Report Var(flag_ipa_stack_alignment) Init(1) Optimization
+Common Var(flag_ipa_stack_alignment) Init(1) Optimization
Reduce stack alignment on call sites if possible.
fipa-matrix-reorg
Does nothing. Preserved for backward compatibility.
fipa-vrp
-Common Report Var(flag_ipa_vrp) Optimization
+Common Var(flag_ipa_vrp) Optimization
Perform IPA Value Range Propagation.
fira-algorithm=
Common Joined RejectNegative Enum(ira_algorithm) Var(flag_ira_algorithm) Init(IRA_ALGORITHM_CB) Optimization
-fira-algorithm=[CB|priority] Set the used IRA algorithm.
+fipa-strict-aliasing
+Common Var(flag_ipa_strict_aliasing) Init(1) Optimization
+Assume strict aliasing rules apply across (uninlined) function boundaries.
+
Enum
Name(ira_algorithm) Type(enum ira_algorithm) UnknownError(unknown IRA algorithm %qs)
Enum(ira_algorithm) String(priority) Value(IRA_ALGORITHM_PRIORITY)
fira-region=
-Common Joined RejectNegative Enum(ira_region) Var(flag_ira_region) Init(IRA_REGION_AUTODETECT) Optimization
+Common Joined RejectNegative Enum(ira_region) Var(flag_ira_region) Init(IRA_REGION_ONE) Optimization
-fira-region=[one|all|mixed] Set regions for IRA.
Enum
Enum(ira_region) String(mixed) Value(IRA_REGION_MIXED)
fira-hoist-pressure
-Common Report Var(flag_ira_hoist_pressure) Init(1) Optimization
+Common 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) Optimization
+Common Var(flag_ira_loop_pressure) Optimization
Use IRA based register pressure calculation
in RTL loop optimizations.
fira-share-save-slots
-Common Report Var(flag_ira_share_save_slots) Init(1) Optimization
+Common Var(flag_ira_share_save_slots) Init(1) Optimization
Share slots for saving different hard registers.
fira-share-spill-slots
-Common Report Var(flag_ira_share_spill_slots) Init(1) Optimization
+Common Var(flag_ira_share_spill_slots) Init(1) Optimization
Share stack slots for spilled pseudo-registers.
fira-verbose=
-fira-verbose=<number> Control IRA's level of diagnostic messages.
fivopts
-Common Report Var(flag_ivopts) Init(1) Optimization
+Common Var(flag_ivopts) Init(1) Optimization
Optimize induction variables on trees.
fjump-tables
Common Var(flag_jump_tables) Init(1) Optimization
Use jump tables for sufficiently large switch statements.
+fbit-tests
+Common Var(flag_bit_tests) Init(1) Optimization
+Use bit tests for sufficiently large switch statements.
+
fkeep-inline-functions
-Common Report Var(flag_keep_inline_functions)
+Common Var(flag_keep_inline_functions)
Generate code for functions even if they are fully inlined.
fkeep-static-functions
-Common Report Var(flag_keep_static_functions)
+Common Var(flag_keep_static_functions)
Generate code for static functions even if they are never called.
fkeep-static-consts
-Common Report Var(flag_keep_static_consts) Init(1)
+Common 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)
+Common Var(flag_leading_underscore) Init(-1)
Give external symbols a leading underscore.
floop-optimize
Does nothing. Preserved for backward compatibility.
flra-remat
-Common Report Var(flag_lra_remat) Optimization
+Common Var(flag_lra_remat) Optimization
Do CFG-sensitive rematerialization in LRA.
flto
Does nothing. Preserved for backward compatibility.
flto-report
-Common Report Var(flag_lto_report) Init(0)
+Common Var(flag_lto_report) Init(0)
Report various link-time optimization statistics.
flto-report-wpa
-Common Report Var(flag_lto_report_wpa) Init(0)
+Common Var(flag_lto_report_wpa) Init(0)
Report various link-time optimization statistics for WPA only.
fmath-errno
-Common Report Var(flag_errno_math) Init(1) Optimization SetByCombined
+Common Var(flag_errno_math) Init(1) Optimization SetByCombined
Set errno after built-in math functions.
fmax-errors=
-fmax-errors=<number> Maximum number of errors to report.
fmem-report
-Common Report Var(mem_report)
+Common Var(mem_report)
Report on permanent memory allocation.
fmem-report-wpa
-Common Report Var(mem_report_wpa)
+Common 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.
fmerge-all-constants
-Common Report Var(flag_merge_constants,2) Init(1)
+Common Var(flag_merge_constants,2) Init(1)
Attempt to merge identical constants and constant variables.
fmerge-constants
-Common Report Var(flag_merge_constants,1)
+Common Var(flag_merge_constants,1)
Attempt to merge identical constants across compilation units.
fmerge-debug-strings
-Common Report Var(flag_merge_debug_strings) Init(1)
+Common Var(flag_merge_debug_strings) Init(1)
Attempt to merge identical debug strings across compilation units.
fmessage-length=
-fmessage-length=<number> Limit diagnostics to <number> characters per line. 0 suppresses line-wrapping.
fmodulo-sched
-Common Report Var(flag_modulo_sched) Optimization
+Common Var(flag_modulo_sched) Optimization
Perform SMS based modulo scheduling before the first scheduling pass.
fmodulo-sched-allow-regmoves
-Common Report Var(flag_modulo_sched_allow_regmoves) Optimization
+Common Var(flag_modulo_sched_allow_regmoves) Optimization
Perform SMS based modulo scheduling with register moves allowed.
fmove-loop-invariants
-Common Report Var(flag_move_loop_invariants) Optimization
+Common Var(flag_move_loop_invariants) Optimization
Move loop invariant computations out of loops.
+fmove-loop-stores
+Common Var(flag_move_loop_stores) Optimization
+Move stores out of loops.
+
fdce
Common Var(flag_dce) Init(1) Optimization
Use the RTL dead code elimination pass.
Use the RTL dead store elimination pass.
freschedule-modulo-scheduled-loops
-Common Report Var(flag_resched_modulo_sched) Optimization
+Common Var(flag_resched_modulo_sched) Optimization
Enable/Disable the traditional scheduling in loops that already passed modulo scheduling.
fnon-call-exceptions
-Common Report Var(flag_non_call_exceptions) Optimization
+Common Var(flag_non_call_exceptions) Optimization
Support synchronous non-call exceptions.
foffload=
-Common Driver Joined MissingArgError(options or targets missing after %qs)
--foffload=<targets>=<options> Specify offloading targets and options for them.
+Driver Joined MissingArgError(targets missing after %qs)
+
+foffload-options=
+Common Driver Joined MissingArgError(options or targets=options missing after %qs)
+-foffload-options=<targets>=<options> Specify options for the offloading targets.
foffload-abi=
-Common Joined RejectNegative Enum(offload_abi) Var(flag_offload_abi) Init(OFFLOAD_ABI_UNSET)
--foffload-abi=[lp64|ilp32] Set the ABI to use in an offload compiler.
+Common Joined RejectNegative Enum(offload_abi)
+-foffload-abi=[lp64|ilp32] Set the ABI to use in an offload compiler.
Enum
Name(offload_abi) Type(enum offload_abi) UnknownError(unknown offload ABI %qs)
Enum(offload_abi) String(lp64) Value(OFFLOAD_ABI_LP64)
fomit-frame-pointer
-Common Report Var(flag_omit_frame_pointer) Optimization
+Common Var(flag_omit_frame_pointer) Optimization
When possible do not generate stack frames.
fopt-info
-Common Report Var(flag_opt_info) Optimization
+Common Var(flag_opt_info) Optimization
Enable all optimization info dumps on stderr.
fopt-info-
-fopt-info[-<type>=filename] Dump compiler optimization details.
fsave-optimization-record
-Common Report Var(flag_save_optimization_record) Optimization
+Common Var(flag_save_optimization_record) Optimization
Write a SRCFILE.opt-record.json file detailing what optimizations were performed.
foptimize-register-move
Does nothing. Preserved for backward compatibility.
foptimize-sibling-calls
-Common Report Var(flag_optimize_sibling_calls) Optimization
+Common Var(flag_optimize_sibling_calls) Optimization
Optimize sibling and tail recursive calls.
fpartial-inlining
-Common Report Var(flag_partial_inlining) Optimization
+Common Var(flag_partial_inlining) Optimization
Perform partial inlining.
fpre-ipa-mem-report
-Common Report Var(pre_ipa_mem_report)
+Common Var(pre_ipa_mem_report)
Report on memory allocation before interprocedural optimization.
fpost-ipa-mem-report
-Common Report Var(post_ipa_mem_report)
+Common Var(post_ipa_mem_report)
Report on memory allocation before interprocedural optimization.
fpack-struct
-Common Report Var(flag_pack_struct) Optimization
+Common Var(flag_pack_struct) Optimization
Pack structure members together without holes.
fpack-struct=
-fpack-struct=<number> Set initial maximum structure member alignment.
fpcc-struct-return
-Common Report Var(flag_pcc_struct_return,1) Init(DEFAULT_PCC_STRUCT_RETURN)
+Common Var(flag_pcc_struct_return,1) Init(DEFAULT_PCC_STRUCT_RETURN)
Return small aggregates in memory, not registers.
fpeel-loops
-Common Report Var(flag_peel_loops) Optimization
+Common Var(flag_peel_loops) Optimization
Perform loop peeling.
fpeephole
-Common Report Var(flag_no_peephole,0) Optimization
+Common Var(flag_no_peephole,0) Optimization
Enable machine specific peephole optimizations.
fpeephole2
-Common Report Var(flag_peephole2) Optimization
+Common Var(flag_peephole2) Optimization
Enable an RTL peephole pass before sched2.
fPIC
-Common Report Var(flag_pic,2) Negative(fPIE) Init(-1)
+Common Var(flag_pic,2) Negative(fPIE) Init(-1)
Generate position-independent code if possible (large mode).
fPIE
-Common Report Var(flag_pie,2) Negative(fpic) Init(-1)
+Common Var(flag_pie,2) Negative(fpic) Init(-1)
Generate position-independent code for executables if possible (large mode).
fpic
-Common Report Var(flag_pic,1) Negative(fpie) Init(-1)
+Common Var(flag_pic,1) Negative(fpie) Init(-1)
Generate position-independent code if possible (small mode).
fpie
-Common Report Var(flag_pie,1) Negative(fPIC) Init(-1)
+Common Var(flag_pie,1) Negative(fPIC) Init(-1)
Generate position-independent code for executables if possible (small mode).
fplt
-Common Report Var(flag_plt) Init(1) Optimization
+Common Var(flag_plt) Init(1) Optimization
Use PLT for PIC calls (-fno-plt: load the address from GOT at call site).
fplugin=
-fplugin-arg-<name>-<key>[=<value>] Specify argument <key>=<value> for plugin <name>.
fpredictive-commoning
-Common Report Var(flag_predictive_commoning) Optimization
+Common Var(flag_predictive_commoning) Optimization
Run predictive commoning optimization.
fprefetch-loop-arrays
-Common Report Var(flag_prefetch_loop_arrays) Init(-1) Optimization
+Common Var(flag_prefetch_loop_arrays) Init(-1) Optimization
Generate prefetch instructions, if available, for arrays in loops.
fprofile
-Common Report Var(profile_flag)
+Common Var(profile_flag)
Enable basic program profiling code.
fprofile-abs-path
-Common Report Var(profile_abs_path_flag)
+Common Var(profile_abs_path_flag)
Generate absolute source path names for gcov.
fprofile-arcs
-Common Report Var(profile_arc_flag)
+Common Var(profile_arc_flag)
Insert arc-based program profiling code.
fprofile-dir=
Select the name for storing the profile note file.
fprofile-correction
-Common Report Var(flag_profile_correction)
+Common Var(flag_profile_correction)
Enable correction of flow inconsistent profile data input.
fprofile-update=
fprofile-filter-files=
Common Joined RejectNegative Var(flag_profile_filter_files)
-Instrument only functions from files where names match any regular expression (separated by a semi-colon).
+Instrument only functions from files whose name matches any of the regular expressions (separated by semi-colons).
fprofile-exclude-files=
Common Joined RejectNegative Var(flag_profile_exclude_files)
-Instrument only functions from files where names do not match all the regular expressions (separated by a semi-colon).
+Instrument only functions from files whose name does not match any of the regular expressions (separated by semi-colons).
+
+Enum
+Name(profile_reproducibility) Type(enum profile_reproducibility) UnknownError(unknown profile reproducibility method %qs)
+
+EnumValue
+Enum(profile_reproducibility) String(serial) Value(PROFILE_REPRODUCIBILITY_SERIAL)
+
+EnumValue
+Enum(profile_reproducibility) String(parallel-runs) Value(PROFILE_REPRODUCIBILITY_PARALLEL_RUNS)
+
+EnumValue
+Enum(profile_reproducibility) String(multithreaded) Value(PROFILE_REPRODUCIBILITY_MULTITHREADED)
+
+fprofile-reproducible=
+Common Joined RejectNegative Var(flag_profile_reproducible) Enum(profile_reproducibility) Init(PROFILE_REPRODUCIBILITY_SERIAL)
+-fprofile-reproducible=[serial|parallel-runs|multithreaded] Control level of reproducibility of profile gathered by -fprofile-generate.
Enum
Name(profile_update) Type(enum profile_update) UnknownError(unknown profile update method %qs)
EnumValue
Enum(profile_update) String(prefer-atomic) Value(PROFILE_UPDATE_PREFER_ATOMIC)
+fprofile-prefix-path=
+Common Joined RejectNegative Var(profile_prefix_path)
+Remove prefix from absolute path before mangling name for -fprofile-generate= and -fprofile-use=.
+
+fprofile-prefix-map=
+Common Joined RejectNegative Var(common_deferred_options) Defer
+-fprofile-prefix-map=<old>=<new> Map one directory name to another in GCOV coverage result.
+
fprofile-generate
Common
Enable common options for generating profile info for profile feedback directed optimizations.
Common Joined RejectNegative
Enable common options for generating profile info for profile feedback directed optimizations, and set -fprofile-dir=.
+fprofile-info-section
+Common RejectNegative
+Register the profile information in the .gcov_info section instead of using a constructor/destructor.
+
+fprofile-info-section=
+Common Joined RejectNegative Var(profile_info_section)
+Register the profile information in the specified section instead of using a constructor/destructor.
+
+fprofile-partial-training
+Common Var(flag_profile_partial_training) Optimization
+Do not assume that functions never executed during the train run are cold.
+
fprofile-use
Common Var(flag_profile_use)
Enable common options for performing profile feedback directed optimizations.
Enable common options for performing profile feedback directed optimizations, and set -fprofile-dir=.
fprofile-values
-Common Report Var(flag_profile_values)
+Common Var(flag_profile_values)
Insert code to profile values of expressions.
fprofile-report
-Common Report Var(profile_report)
+Common Var(profile_report)
Report on consistency of profile.
fprofile-reorder-functions
-Common Report Var(flag_profile_reorder_functions)
+Common Var(flag_profile_reorder_functions) Optimization
Enable function reordering that improves code placement.
fpatchable-function-entry=
-Common Joined Optimization
+Common Var(flag_patchable_function_entry) Joined Optimization
Insert NOP instructions at each function entry.
frandom-seed
; records information in the assembler output file as comments, so
; they never reach the object file.
frecord-gcc-switches
-Common Report Var(flag_record_gcc_switches)
+Common Var(flag_record_gcc_switches)
Record gcc command line switches in the object file.
freg-struct-return
-Common Report Var(flag_pcc_struct_return,0) Optimization
+Common Var(flag_pcc_struct_return,0) Optimization
Return small aggregates in registers.
fregmove
Does nothing. Preserved for backward compatibility.
flifetime-dse
-Common Report Var(flag_lifetime_dse,2) Init(2) Optimization
+Common Var(flag_lifetime_dse,2) Init(2) Optimization
Tell DSE that the storage for a C++ object is dead when the constructor
starts and when the destructor finishes.
Common RejectNegative Alias(flive-patching=,inline-clone) Optimization
flive-patching=
-Common Report Joined RejectNegative Enum(live_patching_level) Var(flag_live_patching) Init(LIVE_PATCHING_NONE) Optimization
+Common Joined RejectNegative Enum(live_patching_level) Var(flag_live_patching) Init(LIVE_PATCHING_NONE) Optimization
-flive-patching=[inline-only-static|inline-clone] Control IPA
optimizations to provide a safe compilation for live-patching. At the same
time, provides multiple-level control on the enabled IPA optimizations.
Enum(live_patching_level) String(inline-clone) Value(LIVE_PATCHING_INLINE_CLONE)
fallocation-dce
-Common Report Var(flag_allocation_dce) Init(1) Optimization
+Common Var(flag_allocation_dce) Init(1) Optimization
Tell DCE to remove unused C++ allocations.
flive-range-shrinkage
-Common Report Var(flag_live_range_shrinkage) Init(0) Optimization
+Common Var(flag_live_range_shrinkage) Init(0) Optimization
Relief of register pressure through live range shrinkage.
frename-registers
-Common Report Var(flag_rename_registers) Init(2) Optimization
+Common Var(flag_rename_registers) Optimization EnabledBy(funroll-loops)
Perform a register renaming optimization pass.
fschedule-fusion
-Common Report Var(flag_schedule_fusion) Init(2) Optimization
+Common Var(flag_schedule_fusion) Init(2) Optimization
Perform a target dependent instruction fusion optimization pass.
freorder-blocks
-Common Report Var(flag_reorder_blocks) Optimization
+Common Var(flag_reorder_blocks) Optimization
Reorder basic blocks to improve code placement.
freorder-blocks-algorithm=
Enum(reorder_blocks_algorithm) String(stc) Value(REORDER_BLOCKS_ALGORITHM_STC)
freorder-blocks-and-partition
-Common Report Var(flag_reorder_blocks_and_partition) Optimization
+Common Var(flag_reorder_blocks_and_partition) Optimization
Reorder basic blocks and partition into hot and cold sections.
freorder-functions
-Common Report Var(flag_reorder_functions) Optimization
+Common Var(flag_reorder_functions) Optimization
Reorder functions to improve code placement.
frerun-cse-after-loop
-Common Report Var(flag_rerun_cse_after_loop) Optimization
+Common Var(flag_rerun_cse_after_loop) Optimization
Add a common subexpression elimination pass after loop optimizations.
frerun-loop-opt
Does nothing. Preserved for backward compatibility.
frounding-math
-Common Report Var(flag_rounding_math) Optimization SetByCombined
+Common Var(flag_rounding_math) Optimization SetByCombined
Disable optimizations that assume default FP rounding behavior.
fsched-interblock
-Common Report Var(flag_schedule_interblock) Init(1) Optimization
+Common Var(flag_schedule_interblock) Init(1) Optimization
Enable scheduling across basic blocks.
fsched-pressure
-Common Report Var(flag_sched_pressure) Init(0) Optimization
+Common Var(flag_sched_pressure) Init(0) Optimization
Enable register pressure sensitive insn scheduling.
fsched-spec
-Common Report Var(flag_schedule_speculative) Init(1) Optimization
+Common Var(flag_schedule_speculative) Init(1) Optimization
Allow speculative motion of non-loads.
fsched-spec-load
-Common Report Var(flag_schedule_speculative_load) Optimization
+Common Var(flag_schedule_speculative_load) Optimization
Allow speculative motion of some loads.
fsched-spec-load-dangerous
-Common Report Var(flag_schedule_speculative_load_dangerous) Optimization
+Common Var(flag_schedule_speculative_load_dangerous) Optimization
Allow speculative motion of more loads.
fsched-verbose=
-fsched-verbose=<number> Set the verbosity level of the scheduler.
fsched2-use-superblocks
-Common Report Var(flag_sched2_use_superblocks) Optimization
+Common Var(flag_sched2_use_superblocks) Optimization
If scheduling post reload, do superblock scheduling.
fsched2-use-traces
Does nothing. Preserved for backward compatibility.
fschedule-insns
-Common Report Var(flag_schedule_insns) Optimization
+Common Var(flag_schedule_insns) Optimization
Reschedule instructions before register allocation.
fschedule-insns2
-Common Report Var(flag_schedule_insns_after_reload) Optimization
+Common Var(flag_schedule_insns_after_reload) Optimization
Reschedule instructions after register allocation.
; This flag should be on when a target implements non-trivial
; scheduling hooks, maybe saving some information for its own sake.
; On IA64, for example, this is used for correct bundling.
fselective-scheduling
-Common Report Var(flag_selective_scheduling) Optimization
+Common Var(flag_selective_scheduling) Optimization
Schedule instructions using selective scheduling algorithm.
fselective-scheduling2
-Common Report Var(flag_selective_scheduling2) Optimization
+Common Var(flag_selective_scheduling2) Optimization
Run selective scheduling after reload.
fself-test=
Run self-tests, using the given path to locate test files.
fsel-sched-pipelining
-Common Report Var(flag_sel_sched_pipelining) Init(0) Optimization
+Common Var(flag_sel_sched_pipelining) Init(0) Optimization
Perform software pipelining of inner loops during selective scheduling.
fsel-sched-pipelining-outer-loops
-Common Report Var(flag_sel_sched_pipelining_outer_loops) Init(0) Optimization
+Common Var(flag_sel_sched_pipelining_outer_loops) Init(0) Optimization
Perform software pipelining of outer loops during selective scheduling.
fsel-sched-reschedule-pipelined
-Common Report Var(flag_sel_sched_reschedule_pipelined) Init(0) Optimization
+Common Var(flag_sel_sched_reschedule_pipelined) Init(0) Optimization
Reschedule pipelined regions without pipelining.
fsemantic-interposition
-Common Report Var(flag_semantic_interposition) Init(1)
+Common Var(flag_semantic_interposition) Init(1) Optimization
Allow interposing function (or variables) by ones with different semantics (or initializer) respectively by dynamic linker.
; sched_stalled_insns means that insns can be moved prematurely from the queue
; of stalled insns into the ready list.
fsched-stalled-insns
-Common Report Var(flag_sched_stalled_insns) Optimization UInteger
+Common Var(flag_sched_stalled_insns) Optimization UInteger
Allow premature scheduling of queued insns.
fsched-stalled-insns=
; premature removal from the queue of stalled insns into the ready list (has
; an effect only if the flag 'sched_stalled_insns' is set).
fsched-stalled-insns-dep
-Common Report Var(flag_sched_stalled_insns_dep,1) Init(1) Optimization UInteger
+Common Var(flag_sched_stalled_insns_dep,1) Init(1) Optimization UInteger
Set dependence distance checking in premature scheduling of queued insns.
fsched-stalled-insns-dep=
-fsched-stalled-insns-dep=<number> Set dependence distance checking in premature scheduling of queued insns.
fsched-group-heuristic
-Common Report Var(flag_sched_group_heuristic) Init(1) Optimization
+Common Var(flag_sched_group_heuristic) Init(1) Optimization
Enable the group heuristic in the scheduler.
fsched-critical-path-heuristic
-Common Report Var(flag_sched_critical_path_heuristic) Init(1) Optimization
+Common Var(flag_sched_critical_path_heuristic) Init(1) Optimization
Enable the critical path heuristic in the scheduler.
fsched-spec-insn-heuristic
-Common Report Var(flag_sched_spec_insn_heuristic) Init(1) Optimization
+Common Var(flag_sched_spec_insn_heuristic) Init(1) Optimization
Enable the speculative instruction heuristic in the scheduler.
fsched-rank-heuristic
-Common Report Var(flag_sched_rank_heuristic) Init(1) Optimization
+Common Var(flag_sched_rank_heuristic) Init(1) Optimization
Enable the rank heuristic in the scheduler.
fsched-last-insn-heuristic
-Common Report Var(flag_sched_last_insn_heuristic) Init(1) Optimization
+Common Var(flag_sched_last_insn_heuristic) Init(1) Optimization
Enable the last instruction heuristic in the scheduler.
fsched-dep-count-heuristic
-Common Report Var(flag_sched_dep_count_heuristic) Init(1) Optimization
+Common Var(flag_sched_dep_count_heuristic) Init(1) Optimization
Enable the dependent count heuristic in the scheduler.
fsection-anchors
-Common Report Var(flag_section_anchors) Optimization
+Common Var(flag_section_anchors) Optimization
Access data in the same section from shared anchor points.
fsee
Does nothing. Preserved for backward compatibility.
free
-Common Report Var(flag_ree) Init(0)
+Common Var(flag_ree) Init(0) Optimization
Turn on Redundant Extensions Elimination pass.
fshow-column
-Common Report Var(flag_show_column) Init(1)
+Common Var(flag_show_column) Init(1)
Show column numbers in diagnostics, when available. Default on.
fshrink-wrap
-Common Report Var(flag_shrink_wrap) Optimization
+Common 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.
fshrink-wrap-separate
-Common Report Var(flag_shrink_wrap_separate) Init(1) Optimization
+Common Var(flag_shrink_wrap_separate) Init(1) Optimization
Shrink-wrap parts of the prologue and epilogue separately.
fsignaling-nans
-Common Report Var(flag_signaling_nans) Optimization SetByCombined
+Common Var(flag_signaling_nans) Optimization SetByCombined
Disable optimizations observable by IEEE signaling NaNs.
fsigned-zeros
-Common Report Var(flag_signed_zeros) Init(1) Optimization SetByCombined
+Common 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_single_precision_constant) Optimization
+Common Var(flag_single_precision_constant) Optimization
Convert floating point constants to single precision constants.
fsplit-ivs-in-unroller
-Common Report Var(flag_split_ivs_in_unroller) Init(1) Optimization
+Common Var(flag_split_ivs_in_unroller) Init(1) Optimization
Split lifetimes of induction variables when loops are unrolled.
fsplit-stack
-Common Report Var(flag_split_stack) Init(-1)
+Common Var(flag_split_stack) Init(-1)
Generate discontiguous stack frames.
fsplit-wide-types
-Common Report Var(flag_split_wide_types) Optimization
+Common Var(flag_split_wide_types) Optimization
Split wide types into independent registers.
fsplit-wide-types-early
-Common Report Var(flag_split_wide_types_early) Optimization
+Common Var(flag_split_wide_types_early) Optimization
Split wide types into independent registers earlier.
fssa-backprop
-Common Report Var(flag_ssa_backprop) Init(1) Optimization
+Common Var(flag_ssa_backprop) Init(1) Optimization
Enable backward propagation of use properties at the SSA level.
fssa-phiopt
-Common Report Var(flag_ssa_phiopt) Optimization
+Common Var(flag_ssa_phiopt) Optimization
Optimize conditional patterns using SSA PHI nodes.
fstdarg-opt
-Common Report Var(flag_stdarg_opt) Init(1) Optimization
+Common Var(flag_stdarg_opt) Init(1) Optimization
Optimize amount of stdarg registers saved to stack at start of function.
fvariable-expansion-in-unroller
-Common Report Var(flag_variable_expansion_in_unroller) Optimization
+Common Var(flag_variable_expansion_in_unroller) Optimization
Apply variable expansion when loops are unrolled.
fstack-check=
-Common Report RejectNegative Joined Optimization
+Common RejectNegative Joined Optimization
-fstack-check=[no|generic|specific] Insert stack checking code into the program.
fstack-check
Insert stack checking code into the program. Same as -fstack-check=specific.
fstack-clash-protection
-Common Report Var(flag_stack_clash_protection) Optimization
+Common Var(flag_stack_clash_protection) Optimization
Insert code to probe each page of stack space as it is allocated to protect
from stack-clash style attacks.
-fstack-limit-symbol=<name> Trap if the stack goes past symbol <name>.
fstack-protector
-Common Report Var(flag_stack_protect, 1) Init(-1) Optimization
+Common Var(flag_stack_protect, 1) Init(-1) Optimization
Use propolice as a stack protection method.
fstack-protector-all
-Common Report RejectNegative Var(flag_stack_protect, 2) Init(-1) Optimization
+Common RejectNegative Var(flag_stack_protect, 2) Init(-1) Optimization
Use a stack protection method for every function.
fstack-protector-strong
-Common Report RejectNegative Var(flag_stack_protect, 3) Init(-1) Optimization
+Common RejectNegative Var(flag_stack_protect, 3) Init(-1) Optimization
Use a smart stack protection method for certain functions.
fstack-protector-explicit
-Common Report RejectNegative Var(flag_stack_protect, 4) Optimization
+Common RejectNegative Var(flag_stack_protect, 4) Optimization
Use stack protection method only for functions with the stack_protect attribute.
fstack-usage
; types do not alias expressions of certain other types. Only used
; if alias analysis (in general) is enabled.
fstrict-aliasing
-Common Report Var(flag_strict_aliasing) Optimization
+Common Var(flag_strict_aliasing) Optimization
Assume strict aliasing rules apply.
fstrict-overflow
-Common Report
+Common
Treat signed overflow as undefined. Negated as -fwrapv -fwrapv-pointer.
fsync-libcalls
-Common Report Var(flag_sync_libcalls) Init(1)
+Common Var(flag_sync_libcalls) Init(1)
Implement __atomic operations via libcalls to legacy __sync functions.
fsyntax-only
-Common Report Var(flag_syntax_only)
+Common Var(flag_syntax_only)
Check for syntax errors, then stop.
ftest-coverage
-Common Report Var(flag_test_coverage)
+Common Var(flag_test_coverage)
Create data files needed by \"gcov\".
fthread-jumps
-Common Report Var(flag_thread_jumps) Optimization
+Common Var(flag_thread_jumps) Optimization
Perform jump threading optimizations.
ftime-report
-Common Report Var(time_report)
+Common Var(time_report)
Report the time taken by each compiler pass.
ftime-report-details
-Common Report Var(time_report_details)
+Common Var(time_report_details)
Record times taken by sub-phases separately.
ftls-model=
Enum(tls_model) String(local-exec) Value(TLS_MODEL_LOCAL_EXEC)
ftoplevel-reorder
-Common Report Var(flag_toplevel_reorder) Init(2)
+Common Var(flag_toplevel_reorder) Init(2) Optimization
Reorder top level functions, variables, and asms.
ftracer
-Common Report Var(flag_tracer) Optimization
+Common Var(flag_tracer) Optimization
Perform superblock formation via tail duplication.
ftrampolines
-Common Report Var(flag_trampolines) Init(0)
+Common Var(flag_trampolines) Init(0)
For targets that normally need trampolines for nested functions, always
generate them instead of using descriptors.
; (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 SetByCombined
+Common Var(flag_trapping_math) Init(1) Optimization SetByCombined
Assume floating-point operations can trap.
ftrapv
-Common Report Var(flag_trapv) Optimization
+Common Var(flag_trapv) Optimization
Trap for signed overflow in addition, subtraction and multiplication.
ftree-ccp
-Common Report Var(flag_tree_ccp) Optimization
+Common Var(flag_tree_ccp) Optimization
Enable SSA-CCP optimization on trees.
ftree-bit-ccp
-Common Report Var(flag_tree_bit_ccp) Optimization
+Common Var(flag_tree_bit_ccp) Optimization
Enable SSA-BIT-CCP optimization on trees.
ftree-store-ccp
Does nothing. Preserved for backward compatibility.
ftree-ch
-Common Report Var(flag_tree_ch) Optimization
+Common Var(flag_tree_ch) Optimization
Enable loop header copying on trees.
ftree-coalesce-inlined-vars
Does nothing. Preserved for backward compatibility.
ftree-coalesce-vars
-Common Report Var(flag_tree_coalesce_vars) Optimization
+Common Var(flag_tree_coalesce_vars) Optimization
Enable SSA coalescing of user variables.
ftree-copyrename
Does nothing. Preserved for backward compatibility.
ftree-copy-prop
-Common Report Var(flag_tree_copy_prop) Optimization
+Common Var(flag_tree_copy_prop) Optimization
Enable copy propagation on trees.
ftree-store-copy-prop
Does nothing. Preserved for backward compatibility.
ftree-cselim
-Common Report Var(flag_tree_cselim) Init(2) Optimization
+Common Var(flag_tree_cselim) Optimization
Transform condition stores into unconditional ones.
ftree-switch-conversion
-Common Report Var(flag_tree_switch_conversion) Optimization
+Common Var(flag_tree_switch_conversion) Optimization
Perform conversions of switch initializations.
ftree-dce
-Common Report Var(flag_tree_dce) Optimization
+Common Var(flag_tree_dce) Optimization
Enable SSA dead code elimination optimization on trees.
ftree-dominator-opts
-Common Report Var(flag_tree_dom) Optimization
+Common Var(flag_tree_dom) Optimization
Enable dominator optimizations.
ftree-tail-merge
-Common Report Var(flag_tree_tail_merge) Optimization
+Common Var(flag_tree_tail_merge) Optimization
Enable tail merging on trees.
ftree-dse
-Common Report Var(flag_tree_dse) Optimization
+Common Var(flag_tree_dse) Optimization
Enable dead store elimination.
ftree-forwprop
-Common Report Var(flag_tree_forwprop) Init(1) Optimization
+Common Var(flag_tree_forwprop) Init(1) Optimization
Enable forward propagation on trees.
ftree-fre
-Common Report Var(flag_tree_fre) Optimization
+Common Var(flag_tree_fre) Optimization
Enable Full Redundancy Elimination (FRE) on trees.
foptimize-strlen
-Common Report Var(flag_optimize_strlen) Optimization
+Common Var(flag_optimize_strlen) Optimization
Enable string length optimizations on trees.
fisolate-erroneous-paths-dereference
-Common Report Var(flag_isolate_erroneous_paths_dereference) Optimization
+Common Var(flag_isolate_erroneous_paths_dereference) Optimization
Detect paths that trigger erroneous or undefined behavior due to
dereferencing a null pointer. Isolate those paths from the main control
flow and turn the statement with erroneous or undefined behavior into a trap.
fisolate-erroneous-paths-attribute
-Common Report Var(flag_isolate_erroneous_paths_attribute) Optimization
+Common Var(flag_isolate_erroneous_paths_attribute) Optimization
Detect paths that trigger erroneous or undefined behavior due to a null value
being used in a way forbidden by a returns_nonnull or nonnull
attribute. Isolate those paths from the main control flow and turn the
statement with erroneous or undefined behavior into a trap.
ftree-loop-distribution
-Common Report Var(flag_tree_loop_distribution) Optimization
+Common Var(flag_tree_loop_distribution) Optimization
Enable loop distribution on trees.
ftree-loop-distribute-patterns
-Common Report Var(flag_tree_loop_distribute_patterns) Optimization
+Common Var(flag_tree_loop_distribute_patterns) Optimization
Enable loop distribution for patterns transformed into a library call.
ftree-loop-im
-Common Report Var(flag_tree_loop_im) Init(1) Optimization
+Common Var(flag_tree_loop_im) Init(1) Optimization
Enable loop invariant motion on trees.
ftree-loop-linear
Enable loop nest transforms. Same as -floop-nest-optimize.
ftree-loop-ivcanon
-Common Report Var(flag_tree_loop_ivcanon) Init(1) Optimization
+Common Var(flag_tree_loop_ivcanon) Init(1) Optimization
Create canonical induction variables in loops.
ftree-loop-optimize
-Common Report Var(flag_tree_loop_optimize) Init(1) Optimization
+Common Var(flag_tree_loop_optimize) Init(1) Optimization
Enable loop optimizations on tree level.
ftree-parallelize-loops=
-Common Report Joined RejectNegative UInteger Var(flag_tree_parallelize_loops) Init(1) Optimization
+Common Joined RejectNegative UInteger Var(flag_tree_parallelize_loops) Init(1) Optimization
-ftree-parallelize-loops=<number> Enable automatic parallelization of loops.
ftree-phiprop
-Common Report Var(flag_tree_phiprop) Init(1) Optimization
+Common Var(flag_tree_phiprop) Init(1) Optimization
Enable hoisting loads from conditional pointers.
ftree-pre
-Common Report Var(flag_tree_pre) Optimization
+Common Var(flag_tree_pre) Optimization
Enable SSA-PRE optimization on trees.
ftree-partial-pre
-Common Report Var(flag_tree_partial_pre) Optimization
+Common 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) Optimization
+Common Var(flag_tree_pta) Optimization
Perform function-local points-to analysis on trees.
ftree-reassoc
-Common Report Var(flag_tree_reassoc) Init(1) Optimization
+Common Var(flag_tree_reassoc) Init(1) Optimization
Enable reassociation on tree level.
ftree-salias
Does nothing. Preserved for backward compatibility.
ftree-sink
-Common Report Var(flag_tree_sink) Optimization
+Common Var(flag_tree_sink) Optimization
Enable SSA code sinking on trees.
ftree-slsr
-Common Report Var(flag_tree_slsr) Optimization
+Common Var(flag_tree_slsr) Optimization
Perform straight-line strength reduction.
ftree-sra
-Common Report Var(flag_tree_sra) Optimization
+Common Var(flag_tree_sra) Optimization
Perform scalar replacement of aggregates.
ftree-ter
-Common Report Var(flag_tree_ter) Optimization
+Common Var(flag_tree_ter) Optimization
Replace temporary expressions in the SSA->normal pass.
ftree-lrs
-Common Report Var(flag_tree_live_range_split) Optimization
+Common Var(flag_tree_live_range_split) Optimization
Perform live range splitting during the SSA->normal pass.
ftree-vrp
-Common Report Var(flag_tree_vrp) Init(0) Optimization
+Common Var(flag_tree_vrp) Init(0) Optimization
Perform Value Range Propagation on trees.
fsplit-paths
-Common Report Var(flag_split_paths) Init(0) Optimization
+Common Var(flag_split_paths) Init(0) Optimization
Split paths leading to loop backedges.
funconstrained-commons
trailing array.
funit-at-a-time
-Common Report Var(flag_unit_at_a_time) Init(1)
+Common Var(flag_unit_at_a_time) Init(1)
Compile whole compilation unit at a time.
funroll-loops
-Common Report Var(flag_unroll_loops) Optimization
+Common Var(flag_unroll_loops) Optimization EnabledBy(funroll-all-loops)
Perform loop unrolling when iteration count is known.
funroll-all-loops
-Common Report Var(flag_unroll_all_loops) Optimization
+Common Var(flag_unroll_all_loops) Optimization
Perform loop unrolling for all loops.
+funroll-completely-grow-size
+Undocumented Var(flag_cunroll_grow_size) Optimization
+; Internal undocumented flag, allow size growth during complete unrolling
+
; 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
Does nothing. Preserved for backward compatibility.
fassociative-math
-Common Report Var(flag_associative_math) SetByCombined Optimization
+Common Var(flag_associative_math) SetByCombined Optimization
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) SetByCombined Optimization
+Common Var(flag_reciprocal_math) SetByCombined Optimization
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 SetByCombined
+Common Var(flag_unsafe_math_optimizations) Optimization SetByCombined
Allow math optimizations that may violate IEEE or ISO standards.
funswitch-loops
-Common Report Var(flag_unswitch_loops) Optimization
+Common Var(flag_unswitch_loops) Optimization
Perform loop unswitching.
fsplit-loops
-Common Report Var(flag_split_loops) Optimization
+Common Var(flag_split_loops) Optimization
Perform loop splitting.
fversion-loops-for-strides
-Common Report Var(flag_version_loops_for_strides) Optimization
+Common Var(flag_version_loops_for_strides) Optimization
Version loops based on whether indices have a stride of one.
funwind-tables
-Common Report Var(flag_unwind_tables) Optimization
+Common Var(flag_unwind_tables) Optimization
Just generate unwind tables for exception handling.
fuse-ld=bfd
Common Driver Negative(fuse-ld=lld)
Use the lld LLVM linker instead of the default linker.
+fuse-ld=mold
+Common Driver Negative(fuse-ld=mold)
+Use the Modern linker (MOLD) linker instead of the default linker.
+
fuse-linker-plugin
Common Undocumented Var(flag_use_linker_plugin)
; Positive if we should track variables, negative if we should run
; the var-tracking pass only to discard debug annotations, zero if
-; we're not to run it. When flag_var_tracking == 2 (AUTODETECT_VALUE) it
-; will be set according to optimize, debug_info_level and debug_hooks
-; in process_options ().
+; we're not to run it.
fvar-tracking
-Common Report Var(flag_var_tracking) Init(2) PerFunction
+Common Var(flag_var_tracking) PerFunction EnabledBy(fvar-tracking-uninit)
Perform variable tracking.
; Positive if we should track variables at assignments, negative if
; we should run the var-tracking pass only to discard debug
-; annotations. When flag_var_tracking_assignments ==
-; AUTODETECT_VALUE it will be set according to flag_var_tracking.
+; annotations.
fvar-tracking-assignments
-Common Report Var(flag_var_tracking_assignments) Init(2) PerFunction
+Common Var(flag_var_tracking_assignments) PerFunction
Perform variable tracking by annotating assignments.
; Nonzero if we should toggle flag_var_tracking_assignments after
; processing options and computing its default. */
fvar-tracking-assignments-toggle
-Common Report Var(flag_var_tracking_assignments_toggle) PerFunction
+Common Var(flag_var_tracking_assignments_toggle) PerFunction
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.
+; annotations.
fvar-tracking-uninit
-Common Report Var(flag_var_tracking_uninit) PerFunction
+Common Var(flag_var_tracking_uninit) PerFunction
Perform variable tracking and also tag variables that are uninitialized.
; Alias to enable both -ftree-loop-vectorize and -ftree-slp-vectorize.
ftree-vectorize
-Common Report Optimization
+Common Var(flag_tree_vectorize) Optimization
Enable vectorization on trees.
ftree-vectorizer-verbose=
Does nothing. Preserved for backward compatibility.
ftree-loop-vectorize
-Common Report Var(flag_tree_loop_vectorize) Optimization EnabledBy(ftree-vectorize)
+Common Var(flag_tree_loop_vectorize) Optimization EnabledBy(ftree-vectorize)
Enable loop vectorization on trees.
ftree-slp-vectorize
-Common Report Var(flag_tree_slp_vectorize) Optimization EnabledBy(ftree-vectorize)
+Common Var(flag_tree_slp_vectorize) Optimization EnabledBy(ftree-vectorize)
Enable basic block vectorization (SLP) on trees.
fvect-cost-model=
Common Joined RejectNegative Enum(vect_cost_model) Var(flag_vect_cost_model) Init(VECT_COST_MODEL_DEFAULT) Optimization
--fvect-cost-model=[unlimited|dynamic|cheap] Specifies the cost model for vectorization.
+-fvect-cost-model=[unlimited|dynamic|cheap|very-cheap] Specifies the cost model for vectorization.
fsimd-cost-model=
Common Joined RejectNegative Enum(vect_cost_model) Var(flag_simd_cost_model) Init(VECT_COST_MODEL_UNLIMITED) Optimization
--fsimd-cost-model=[unlimited|dynamic|cheap] Specifies the vectorization cost model for code marked with a simd directive.
+-fsimd-cost-model=[unlimited|dynamic|cheap|very-cheap] Specifies the vectorization cost model for code marked with a simd directive.
Enum
Name(vect_cost_model) Type(enum vect_cost_model) UnknownError(unknown vectorizer cost model %qs)
EnumValue
Enum(vect_cost_model) String(cheap) Value(VECT_COST_MODEL_CHEAP)
+EnumValue
+Enum(vect_cost_model) String(very-cheap) Value(VECT_COST_MODEL_VERY_CHEAP)
+
fvect-cost-model
Common Alias(fvect-cost-model=,dynamic,unlimited)
Enables the dynamic vectorizer cost model. Preserved for backward compatibility.
Does nothing. Preserved for backward compatibility.
ftree-scev-cprop
-Common Report Var(flag_tree_scev_cprop) Init(1) Optimization
+Common Var(flag_tree_scev_cprop) Init(1) Optimization
Enable copy propagation of scalar-evolution information.
+ftrivial-auto-var-init=
+Common Joined RejectNegative Enum(auto_init_type) Var(flag_auto_var_init) Init(AUTO_INIT_UNINITIALIZED) Optimization
+-ftrivial-auto-var-init=[uninitialized|pattern|zero] Add initializations to automatic variables.
+
+Enum
+Name(auto_init_type) Type(enum auto_init_type) UnknownError(unrecognized automatic variable initialization type %qs)
+
+EnumValue
+Enum(auto_init_type) String(uninitialized) Value(AUTO_INIT_UNINITIALIZED)
+
+EnumValue
+Enum(auto_init_type) String(pattern) Value(AUTO_INIT_PATTERN)
+
+EnumValue
+Enum(auto_init_type) String(zero) Value(AUTO_INIT_ZERO)
+
; -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
; -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)
+Common Var(flag_verbose_asm)
Add extra commentary to assembler output.
fvisibility=
Output vtable verification pointer sets information.
fvpt
-Common Report Var(flag_value_profile_transformations) Optimization
+Common Var(flag_value_profile_transformations) Optimization
Use expression value profiles in optimizations.
fweb
-Common Report Var(flag_web) Init(2) Optimization
+Common Var(flag_web) Optimization EnabledBy(funroll-loops)
Construct webs and split unrelated uses of single variable.
ftree-builtin-call-dce
-Common Report Var(flag_tree_builtin_call_dce) Init(0) Optimization
+Common Var(flag_tree_builtin_call_dce) Init(0) Optimization
Enable conditional dead code elimination for builtin calls.
fwhole-program
-Common Report Var(flag_whole_program) Init(0)
+Common Var(flag_whole_program) Init(0)
Perform whole program optimizations.
fwrapv-pointer
-Common Report Var(flag_wrapv_pointer) Optimization
+Common Var(flag_wrapv_pointer) Optimization
Assume pointer overflow wraps around.
fwrapv
-Common Report Var(flag_wrapv) Optimization
+Common Var(flag_wrapv) Optimization
Assume signed arithmetic overflow wraps around.
fzero-initialized-in-bss
-Common Report Var(flag_zero_initialized_in_bss) Init(1)
+Common Var(flag_zero_initialized_in_bss) Init(1)
Put zero initialized data in the bss section.
+fzero-call-used-regs=
+Common RejectNegative Joined
+Clear call-used registers upon function return.
+
g
Common Driver RejectNegative JoinedOrMissing
Generate debug information in default format.
gas-loc-support
-Common Driver Var(dwarf2out_as_loc_support) Init(2)
+Common Driver Var(dwarf2out_as_loc_support)
Assume assembler support for (DWARF2+) .loc directives.
gas-locview-support
-Common Driver Var(dwarf2out_as_locview_support) Init(2)
+Common Driver Var(dwarf2out_as_locview_support)
Assume assembler support for view in (DWARF2+) .loc directives.
gcoff
Common Driver Var(debug_column_info,1) Init(1)
Record DW_AT_decl_column and DW_AT_call_column in DWARF.
+; The CTF generation process feeds off DWARF dies. This option implicitly
+; updates the debug_info_level to DINFO_LEVEL_NORMAL.
+gctf
+Common Driver RejectNegative JoinedOrMissing
+Generate CTF debug information at default level.
+
+gbtf
+Common Driver RejectNegative JoinedOrMissing
+Generate BTF debug information at default level.
+
gdwarf
Common Driver JoinedOrMissing Negative(gdwarf-)
Generate debug information in default version of DWARF format.
gdwarf-
-Common Driver Joined UInteger Var(dwarf_version) Init(4) Negative(gstabs)
+Common Driver Joined UInteger Var(dwarf_version) Init(5) Negative(gstabs)
Generate debug information in DWARF v2 (or later) format.
+gdwarf32
+Common Driver Var(dwarf_offset_size,4) Init(4) RejectNegative
+Use 32-bit DWARF format when emitting DWARF debug information.
+
+gdwarf64
+Common Driver Var(dwarf_offset_size,8) RejectNegative
+Use 64-bit DWARF format when emitting DWARF debug information.
+
ggdb
Common Driver JoinedOrMissing
Generate debug information in default extended format.
ginline-points
-Common Driver Var(debug_inline_points) Init(2)
+Common Driver Var(debug_inline_points)
Generate extended entry point information for inlined functions.
ginternal-reset-location-views
Generate debug information in extended STABS format.
gstatement-frontiers
-Common Driver Var(debug_nonbind_markers_p) Init(2)
+Common Driver Var(debug_nonbind_markers_p) PerFunction
Emit progressive recommended breakpoint locations.
gstrict-dwarf
-Common Driver Report Var(dwarf_strict) Init(0)
+Common Driver Var(dwarf_strict) Init(0)
Don't emit DWARF additions beyond selected version.
gdescribe-dies
-Common Driver Report Var(flag_describe_dies) Init(0)
+Common Driver Var(flag_describe_dies) Init(0)
Add description attributes to some DWARF DIEs that have no name attribute.
gtoggle
-Common Driver Report Var(flag_gtoggle)
+Common Driver Var(flag_gtoggle)
Toggle debug information generation.
gvariable-location-views
-Common Driver Var(debug_variable_location_views, 1) Init(2)
+Common Driver Var(debug_variable_location_views, 1)
Augment variable location lists with progressive views.
gvariable-location-views=incompat5
Driver
; Documented for Fortran, but always accepted by driver.
+static-libphobos
+Driver
+; Documented for D, but always accepted by driver.
+
static-libstdc++
Driver
static-libasan
Driver
+static-libhwasan
+Driver
+
static-libtsan
Driver
Driver Joined Separate
fipa-ra
-Common Report Var(flag_ipa_ra) Optimization
+Common Var(flag_ipa_ra) Optimization
Use caller save register across calls if possible.
; This comment is to ensure we retain the blank line above.
projects / thirdparty / gcc.git / blobdiff