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3017 checks -fdevirtualize Try to convert virtual calls to direct ones. -fdevirtualize-speculatively Perform speculative devirtualization -fdiagnostics-color always never -fdiagnostics-color= -fdiagnostics-color=[never|always|auto] Colorize diagnostics -fdiagnostics-show-caret Show the source line with a caret indicating the column -fdiagnostics-show-location= -fdiagnostics-show-location=[once|every-line] How often to emit source location at the beginning of line-wrapped diagnostics -fdiagnostics-show-option Amend appropriate diagnostic messages with the command line option that controls them -fdirectives-only Preprocess directives only. -fdisable- -fdisable-[tree|rtl|ipa]-<pass>=range1+range2 disables an optimization pass -fdisable-assertions -fdisable-assertions= -fdollar-ok Allow dollar signs in entity names -fdollars-in-identifiers Permit '$' as an identifier character -fdse Use the RTL dead store elimination pass -fdump- -fdump-<type> Dump various compiler internals to a file -fdump-ada-spec Write all declarations as Ada code transitively -fdump-ada-spec-slim Write all declarations as Ada code for the given file only -fdump-core -fdump-final-insns -fdump-final-insns= -fdump-final-insns=filename Dump to filename the insns at the end of translation -fdump-fortran-optimized Display the code tree after front end optimization -fdump-fortran-original Display the code tree after parsing -fdump-go-spec= -fdump-go-spec=filename Write all declarations to file as Go code -fdump-noaddr Suppress output of addresses in debugging dumps -fdump-parse-tree Display the code tree after parsing; deprecated option -fdump-passes Dump optimization passes -fdump-unnumbered Suppress output of instruction numbers, line number notes and addresses in debugging dumps -fdump-unnumbered-links Suppress output of previous and next insn numbers in debugging dumps -fdwarf2-cfi-asm Enable CFI tables via GAS assembler directives. -fearly-inlining Perform early inlining -felide-constructors -feliminate-dwarf2-dups Perform DWARF2 duplicate elimination -feliminate-unused-debug-symbols Perform unused type elimination in debug info -feliminate-unused-debug-types -femit-class-debug-always Do not suppress C++ class debug information. -femit-class-file Output a class file -femit-class-files Alias for -femit-class-file -femit-function-names Print to stderr the mapping from module name and function id to assembler function name when -ftest-coverage, -fprofile-generate or -fprofile-use are active, for use in correlating function ids in gcda files with the function name. -femit-struct-debug-baseonly -femit-struct-debug-baseonly Aggressive reduced debug info for structs -femit-struct-debug-detailed= -femit-struct-debug-detailed=<spec-list> Detailed reduced debug info for structs -femit-struct-debug-reduced -femit-struct-debug-reduced Conservative reduced debug info for structs -fenable- -fenable-[tree|rtl|ipa]-<pass>=range1+range2 enables an optimization pass -fenable-assertions -fenable-assertions= -fencoding= --encoding=<encoding> Choose input encoding (defaults from your locale) -fenforce-eh-specs Generate code to check exception specifications -fenum-int-equiv -fexceptions Enable exception handling -fexcess-precision= -fexcess-precision=[fast|standard] Specify handling of excess floating-point precision -fexec-charset= -fexec-charset=<cset> Convert all strings and character constants to character set <cset> -fexpensive-optimizations Perform a number of minor, expensive optimizations -fext-numeric-literals Interpret imaginary, fixed-point, or other gnu number suffix as the corresponding number literal rather than a user-defined number literal. -fextdirs= --extdirs=<path> Set the extension directory path -fextended-identifiers Permit universal character names (\u and \U) in identifiers -fextern-tls-init Support dynamic initialization of thread-local variables in a different translation unit -fexternal-blas Specify that an external BLAS library should be used for matmul calls on large-size arrays -fexternal-templates -ff2c Use f2c calling convention -ffast-math -ffat-lto-objects Output lto objects containing both the intermediate language and binary output. -ffilelist-file Input file is a file with a list of filenames to compile -ffinite-math-only Assume no NaNs or infinities are generated -ffixed- -ffixed-<register> Mark <register> as being unavailable to the compiler -ffixed-form Assume that the source file is fixed form -ffixed-line-length- -ffixed-line-length-<n> Use n as character line width in fixed mode -ffixed-line-length-none Allow arbitrary character line width in fixed mode -ffloat-store Don't allocate floats and doubles in extended-precision registers -ffor-scope Scope of for-init-statement variables is local to the loop -fforce-addr -fforce-classes-archive-check Always check for non gcj generated classes archives -fforward-propagate Perform a forward propagation pass on RTL -ffp-contract= -ffp-contract=[off|on|fast] Perform floating-point expression contraction. -ffpe-summary= -ffpe-summary=[...] Print summary of floating point exceptions -ffpe-trap= -ffpe-trap=[...] Stop on following floating point exceptions -ffree-form Assume that the source file is free form -ffree-line-length- -ffree-line-length-<n> Use n as character line width in free mode -ffree-line-length-none Allow arbitrary character line width in free mode -ffreestanding Do not assume that standard C libraries and "main" exist -ffriend-injection Inject friend functions into enclosing namespace -ffrontend-optimize Enable front end optimization -ffunction-attribute-list= -ffunction-attribute-list=attribute:name,... Add attribute to named functions -ffunction-cse Allow function addresses to be held in registers -ffunction-sections Place each function into its own section -fgcse Perform global common subexpression elimination -fgcse-after-reload Perform global common subexpression elimination after register allocation has finished -fgcse-las Perform redundant load after store elimination in global common subexpression elimination -fgcse-lm Perform enhanced load motion during global common subexpression elimination -fgcse-sm Perform store motion after global common subexpression elimination -fgnu-keywords Recognize GNU-defined keywords -fgnu-runtime Generate code for GNU runtime environment -fgnu-tm Enable support for GNU transactional memory -fgnu-unique Use STB_GNU_UNIQUE if supported by the assembler -fgnu89-inline Use traditional GNU semantics for inline functions -fgo-check-divide-overflow Add explicit checks for division overflow in INT_MIN / -1 -fgo-check-divide-zero Add explicit checks for division by zero -fgo-dump- -fgo-dump-<type> Dump Go frontend internal information -fgo-optimize- -fgo-optimize-<type> Turn on optimization passes in the frontend -fgo-pkgpath= -fgo-pkgpath=<string> Set Go package path -fgo-prefix= -fgo-prefix=<string> Set package-specific prefix for exported Go names -fgo-relative-import-path= -fgo-relative-import-path=<path> Treat a relative import as relative to path -fgraphite Enable in and out of Graphite representation -fgraphite-identity Enable Graphite Identity transformation -fguess-branch-probability Enable guessing of branch probabilities -fguiding-decls -fhandle-exceptions -fhandle-exceptions has been renamed -fexceptions (and is now on by default) -fhash-synchronization Assume the runtime uses a hash table to map an object to its synchronization structure -fhelp -fhelp= -fhoist-adjacent-loads Enable hoisting adjacent loads to encourage generating conditional move instructions -fhonor-std -fhosted Assume normal C execution environment -fhuge-objects -fident Process #ident directives -fif-conversion Perform conversion of conditional jumps to branchless equivalents -fif-conversion2 Perform conversion of conditional jumps to conditional execution -fimplement-inlines Export functions even if they can be inlined -fimplicit-inline-templates Emit implicit instantiations of inline templates -fimplicit-none Specify that no implicit typing is allowed, unless overridden by explicit IMPLICIT statements -fimplicit-templates Emit implicit instantiations of templates -findirect-classes Generate instances of Class at runtime -findirect-dispatch Use offset tables for virtual method calls -findirect-inlining Perform indirect inlining -finhibit-size-directive Do not generate .size directives -finit-character= -finit-character=<n> Initialize local character variables to ASCII value n -finit-integer= -finit-integer=<n> Initialize local integer variables to n -finit-local-zero Initialize local variables to zero (from g77) -finit-logical= -finit-logical=<true|false> Initialize local logical variables -finit-real= -finit-real=<zero|nan|inf|-inf> Initialize local real variables -finline Enable inlining of function declared "inline", disabling disables all inlining -finline-atomics Inline __atomic operations when a lock free instruction sequence is available. -finline-functions Integrate functions not declared "inline" into their callers when profitable -finline-functions-called-once Integrate functions only required by their single caller -finline-limit- -finline-limit= -finline-limit=<number> Limit the size of inlined functions to <number> -finline-small-functions Integrate functions into their callers when code size is known not to grow -finput-charset= -finput-charset=<cset> Specify the default character set for source files -finstrument-functions Instrument function entry and exit with profiling calls -finstrument-functions-exclude-file-list= -finstrument-functions-exclude-file-list=filename,... Do not instrument functions listed in files -finstrument-functions-exclude-function-list= -finstrument-functions-exclude-function-list=name,... Do not instrument listed functions -finteger-4-integer-8 Interpret any INTEGER(4) as an INTEGER(8) -fintrinsic-modules-path Specify where to find the compiled intrinsic modules -fintrinsic-modules-path= -fipa-cp Perform interprocedural constant propagation -fipa-cp-clone Perform cloning to make Interprocedural constant propagation stronger -fipa-matrix-reorg -fipa-profile Perform interprocedural profile propagation -fipa-pta Perform interprocedural points-to analysis -fipa-pure-const Discover pure and const functions -fipa-reference Discover readonly and non addressable static variables -fipa-sra Perform interprocedural reduction of aggregates -fipa-struct-reorg -fira-algorithm= -fira-algorithm=[CB|priority] Set the used IRA algorithm -fira-hoist-pressure Use IRA based register pressure calculation in RTL hoist optimizations. -fira-loop-pressure Use IRA based register pressure calculation in RTL loop optimizations. -fira-region= -fira-region=[one|all|mixed] Set regions for IRA -fira-share-save-slots Share slots for saving different hard registers. -fira-share-spill-slots Share stack slots for spilled pseudo-registers. -fira-verbose= -fira-verbose=<number> Control IRA's level of diagnostic messages. -fisolate-erroneous-paths-attribute Detect paths which trigger erroneous or undefined behaviour due a NULL value being used in a way which is forbidden by a returns_nonnull or nonnull attribute. Isolate those paths from the main control flow and turn the statement with erroneous or undefined behaviour into a trap. -fisolate-erroneous-paths-dereference Detect paths which trigger erroneous or undefined behaviour due to dereferencing a NULL pointer. Isolate those paths from the main control flow and turn the statement with erroneous or undefined behaviour into a trap. -fivopts Optimize induction variables on trees -fjni Assume native functions are implemented using JNI -fjump-tables Use jump tables for sufficiently large switch statements -fkeep-inline-dllexport Don't emit dllexported inline functions unless needed -fkeep-inline-functions Generate code for functions even if they are fully inlined -fkeep-static-consts Emit static const variables even if they are not used -flabels-ok -flax-vector-conversions Allow implicit conversions between vectors with differing numbers of subparts
