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Warn about implicit declarations -Wimplicit-function-declaration Warn about implicit function declarations Warn when a declaration does not specify a type Warn about calls with implicit interface Warn about called procedures not explicitly declared Warn about variables which are initialized to themselves Warn when an inlined function cannot be inlined Warn when there is a cast to a pointer from an integer of a different size Warn if a user-procedure has the same name as an intrinsic Warn on intrinsics not part of the selected standard Warn about invalid uses of the "offsetof" macro Warn about PCH files that are found but not used Warn when a jump misses a variable initialization -Wlarger-than= Warn if an object is larger than bytes Warn about truncated source lines Warn when a logical operator is suspiciously always evaluating to true or false Do not warn about using "long long" when -pedantic Warn about suspicious declarations of "main" Warn about maybe uninitialized automatic variables Warn about possibly missing braces around initializers Warn about global functions without previous declarations Warn about missing fields in struct initializers Warn about functions which might be candidates for format attributes Warn about user-specified include directories that do not exist Warn about functions which might be candidates for __attribute__((noreturn)) Warn about function parameters declared without a type specifier in K&R-style functions Warn about global functions without prototypes Warn about constructs not instrumented by -fmudflap Warn about use of multi-character character constants -Wno-narrowing In C++0x mode, ignore ill-formed narrowing conversions within { } Warn about "extern" declarations not at file scope Warn when a noexcept expression evaluates to false even though the expression can't actually throw Warn when non-templatized friend functions are declared within a template Warn about non-virtual destructors Warn about NULL being passed to argument slots marked as requiring non-NULL -Wnormalized= Warn about non-normalised Unicode strings Warn if a C-style cast is used in a program Warn for obsolescent usage in a declaration Warn if an old-style parameter definition is used Warn if .class files are out of date Warn about overflow in arithmetic expressions Warn if a string is longer than the maximum portable length specified by the standard Warn about overloaded virtual function names Warn about overriding initializers without side effects Warn when the packed attribute has no effect on struct layout Warn about packed bit-fields whose offset changed in GCC 4.4 Warn when padding is required to align structure members Warn about possibly missing parentheses Warn when converting the type of pointers to member functions Warn about function pointer arithmetic Warn when a pointer differs in signedness in an assignment Warn when a pointer is cast to an integer of a different size Warn if a property for an Objective-C object has no assign semantics specified Warn if inherited methods are unimplemented Warn for implicit type conversions from real to integral values Warn about real-literal-constants with 'q' exponent-letter Warn about multiple declarations of the same object Warn if modifiers are specified when not necessary Warn when the compiler reorders code Warn whenever a function's return type defaults to "int" (C), or about inconsistent return types (C++) Warn if primary and auxiliary modules have mismatched command line options Warn if a selector has multiple methods Warn when a variable is assigned to itself Warn when a variable of a non-POD type is assigned to itself Warn about possible violations of sequence point rules Warn when one local variable shadows another Warn when one local variable shadows another local variable or parameter of compatible type Warn when one local variable shadows another local variable or parameter Warn about signed-unsigned comparisons Warn for implicit type conversions between signed and unsigned integers Warn when overload promotes from unsigned to signed Warn when not issuing stack smashing protection for some reason Warn about code which might break strict aliasing rules Warn about uncasted NULL used as sentinel Warn about optimizations that assume that signed overflow is undefined Warn about unprototyped function declarations Warn if type signatures of candidate methods do not match exactly Warn about functions which might be candidates for __attribute__((const)) Warn about functions which might be candidates for __attribute__((pure)) Warn about "suspicious" constructs Warn about enumerated switches, with no default, missing a case Warn about enumerated switches missing a "default:" statement Warn about all enumerated switches missing a specific case Warn when __sync_fetch_and_nand and __sync_nand_and_fetch built-in functions are used Deprecated. This switch has no effect Do not suppress warnings from system headers Permit nonconforming uses of the tab character Make the thread safety analysis try to bind the function parameters used in the attributes -Wthread-mismatched-lock-acq-rel Warn about mismatched lock acquisition and release -Wthread-mismatched-lock-order Warn about lock acquisition order inconsistent with what specified in the attributes Warn about a lock being acquired recursively Warn about potential thread safety issues when the code is annotated with thread safety attributes Warn about function calls not properly protected by locks specified in the attributes Warn about shared variables not properly protected by locks specified in the attributes -Wthread-unsupported-lock-name Warn about uses of unsupported lock names in attributes Warn when optimizations invalidate the thread safety analysis. Warn about features not present in traditional C Warn of prototypes causing type conversions different from what would happen in the absence of prototype Warn whenever a trampoline is generated Warn if trigraphs are encountered that might affect the meaning of the program Warn if a comparison is always true or always false due to the limited range of the data type Warn about @selector()s without previously declared methods Warn if an undefined macro is used in an #if directive Warn about underflow of numerical constant expressions Warn about uninitialized automatic variables Warn about unrecognized pragmas Does nothing. Preserved for backward compatibility. Warn if the loop cannot be optimized due to nontrivial assumptions. Warn about unsuffixed float constants Warn when a function parameter is only set, otherwise unused Warn when a variable is only set, otherwise unused Warn about unused dummy arguments. Warn when a function is unused Warn about macros defined in the main file that are not used Warn when a function parameter is unused Warn if a caller of a function, marked with attribute warn_unused_result, does not use its return value Warn when an expression value is unused Warn when a variable is unused Do not warn about using variadic macros when -pedantic Warn if a variable length array is used Warn when a register variable is declared volatile In C++, nonzero means warn about deprecated conversion from string literals to 'char *'. In C, similar warning, except that the conversion is of course not deprecated by the ISO C standard. A synonym for -std=c89 (for C) or -std=c++98 (for C++) -aux-info Emit declaration information into -d Enable dumps from specific passes of the compiler -dumpbase Set the file basename to be used for dumps -dumpdir Set the directory name to be used for dumps --CLASSPATH Deprecated; use --classpath instead Generate position-independent code if possible (large mode) Generate position-independent code for executables if possible (large mode) Enforce class member access control semantics Enable alignment of COMMON blocks Align labels which are only reached by jumping All intrinsics procedures are available regardless of selected standard switch %qs is no longer supported Permit the use of the assert keyword Allow optimization for floating-point arithmetic which may change the result of the operation due to rounding. Generate unwind tables that are exact at each instruction boundary Generate auto-inc/dec instructions Do not treat local variables and COMMON blocks as if they were named in SAVE statements Specify that backslash in string introduces an escape character Produce a backtrace when a runtime error is encountered -fblas-matmul-limit= Size of the smallest matrix for which matmul will use BLAS --bootclasspath= Replace system path Generated should be loaded by bootstrap loader Generate code to check bounds before indexing arrays Replace add, compare, branch with branch on count register Use profiling information for branch probabilities Perform branch target load optimization before prologue / epilogue threading -fbranch-target-load-optimize2 Perform branch target load optimization after prologue / epilogue threading Restrict target load migration not to re-use registers in any basic block -fcall-saved- Mark as being preserved across functions -fcall-used- Mark as being corrupted by function calls Save registers around function calls Generate .note.callgraph.text sections listing callees and edge counts. Produce a warning at runtime if a array temporary has been created for a procedure argument Compare the results of several data dependence analyzers. Generate checks for references to NULL -fcheck=[...] Specify which runtime checks are to be performed --classpath= Set class path Enable cloning and hoisting of hot multiversioned paths -fcoarray=[...] Specify which coarray parallelization should be used Looks for opportunities to reduce stack adjustments and stack references. Do not put uninitialized globals in the common section Run only the second compilation of -fcompare-debug -fcompare-debug[=] Compile with and without e.g. -gtoggle, and compare the final-insns dump Perform comparison elimination after register allocation has finished Allow the arguments of the '?' operator to have different types Reduce the size of object files Do not perform optimizations increasing noticeably stack usage -fconst-string-class= Use class for constant strings no class name specified with %qs -fconstexpr-depth= Specify maximum constexpr recursion depth Use big-endian format for unformatted files Use little-endian format for unformatted files Use native format for unformatted files Swap endianness for unformatted files Perform a register copy-propagation optimization pass Use the Cray Pointer extension Perform cross-jumping optimization When running CSE, follow jumps to their targets Does nothing. Preserved for backward compatibility. Complex multiplication and division follow Fortran rules Omit range reduction step when performing complex division Ignore 'D' in column one in fixed form Treat lines with 'D' in column one as comments Place data items into their own section List all available debugging counters with their limits and counts. -fdbg-cnt=:[,:,...] Set the debug counter limit. Use the RTL dead code elimination pass Map one directory name to another in debug information -fno-deduce-init-list disable deduction of std::initializer_list for a template type parameter from a brace-enclosed initializer-list Set the default double precision kind to an 8 byte wide type Set the default integer kind to an 8 byte wide type Set the default real kind to an 8 byte wide type Defer popping functions args from stack until later Attempt to fill delay slots of branch instructions Delete useless null pointer checks Try to convert virtual calls to direct ones. -fdiagnostics-show-location=[once|every-line] How often to emit source location at the beginning of line-wrapped diagnostics Amend appropriate diagnostic messages with the command line option that controls them -fdisable-[tree|rtl|ipa]-=range1+range2 disables an optimization pass Allow dollar signs in entity names Permit '$' as an identifier character Use the RTL dead store elimination pass -fdump- Dump various compiler internals to a file Dump a core file when a runtime error occurs -fdump-final-insns=filename Dump to filename the insns at the end of translation Display the code tree after front end optimization Display the code tree after parsing -fdump-go-spec=filename Write all declarations to file as Go code Suppress output of addresses in debugging dumps Display the code tree after parsing; deprecated option Suppress output of instruction numbers, line number notes and addresses in debugging dumps Suppress output of previous and next insn numbers in debugging dumps Enable CFI tables via GAS assembler directives. Perform DWARF2 duplicate elimination -feliminate-unused-debug-symbols Perform unused type elimination in debug info -feliminate-unused-debug-types Do not suppress C++ class debug information. -femit-struct-debug-baseonly Aggressive reduced debug info for structs -femit-struct-debug-detailed= Detailed reduced debug info for structs -femit-struct-debug-reduced Conservative reduced debug info for structs -fenable-[tree|rtl|ipa]-=range1+range2 enables an optimization pass Generate debug information to support Identical Code Folding (ICF) --encoding= Choose input encoding (defaults from your locale) Generate code to check exception specifications -fexcess-precision=[fast|standard] Specify handling of excess floating-point precision -fexec-charset= Convert all strings and character constants to character set Perform a number of minor, expensive optimizations --extdirs= Set the extension directory path Permit universal character names (\u and \U) in identifiers Specify that an external BLAS library should be used for matmul calls on large-size arrays Input file is a file with a list of filenames to compile Assume no NaNs or infinities are generated -ffixed- Mark as being unavailable to the compiler Assume that the source file is fixed form -ffixed-line-length- Use n as character line width in fixed mode Allow arbitrary character line width in fixed mode Don't allocate floats and doubles in extended-precision registers Scope of for-init-statement variables is local to the loop Always check for non gcj generated classes archives Perform a forward propagation pass on RTL -ffp-contract=[off|on|fast] Perform floating-point expression contraction. -ffpe-trap=[...] Stop on following floating point exceptions Assume that the source file is free form -ffree-line-length- Use n as character line width in free mode Allow arbitrary character line width in free mode Do not assume that standard C libraries and "main" exist Inject friend functions into enclosing namespace Allow function addresses to be held in registers Place each function into its own section Perform global common subexpression elimination Perform global common subexpression elimination after register allocation has finished Perform redundant load after store elimination in global common subexpression elimination Perform enhanced load motion during global common subexpression elimination Perform store motion after global common subexpression elimination Recognize GNU-defined keywords Generate code for GNU runtime environment Use traditional GNU semantics for inline functions -fgo-dump- Dump Go frontend internal information -fgo-prefix= Set package-specific prefix for exported Go names Enable in and out of Graphite representation Enable Graphite Identity transformation Enable guessing of branch probabilities -fhandle-exceptions has been renamed -fexceptions (and is now on by default) Assume the runtime uses a hash table to map an object to its synchronization structure Assume normal C execution environment Perform conversion of conditional jumps to branchless equivalents Perform conversion of conditional jumps to conditional execution Export functions even if they can be inlined Emit implicit instantiations of inline templates Specify that no implicit typing is allowed, unless overridden by explicit IMPLICIT statements Emit implicit instantiations of templates Generate instances of Class at runtime Use offset tables for virtual method calls Do not generate .size directives -finit-character= Initialize local character variables to ASCII value n -finit-integer= Initialize local integer variables to n Initialize local variables to zero (from g77) -finit-logical= Initialize local logical variables -finit-real= Initialize local real variables Pay attention to the "inline" keyword Integrate simple functions into their callers -finline-functions-called-once Integrate functions called once into their callers Consider inlining cold callsites if the caller includes hot code -finline-limit= Limit the size of inlined functions to Integrate simple functions into their callers when code size is known to not growth -finput-charset= Specify the default character set for source files 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 Specify where to find the compiled intrinsic modules Perform Interprocedural constant propagation Perform cloning to make Interprocedural constant propagation stronger Perform matrix layout flattening and transposing based on profiling information. Perform interprocedural profile propagation Perform interprocedural points-to analysis Discover pure and const functions Discover readonly and non addressable static variables Perform interprocedural reduction of aggregates Perform structure layout optimizations based on profiling information. -fira-algorithm=[CB|priority] Set the used IRA algorithm Use IRA based register pressure calculation in RTL loop optimizations. -fira-region=[one|all|mixed] Set regions for IRA Share slots for saving different hard registers. Share stack slots for spilled pseudo-registers. -fira-verbose= Control IRA's level of diagnostic messages. Optimize induction variables on trees Assume native functions are implemented using JNI Use jump tables for sufficiently large switch statements Don't emit dllexported inline functions unless needed Generate code for functions even if they are fully inlined Emit static const variables even if they are not used Allow implicit conversions between vectors with differing numbers of subparts and/or differing element types. Give external symbols a leading underscore Enable Loop Blocking transformation Enable Loop Flattening transformation Enable Loop Interchange transformation Enable Loop Strip Mining transformation Enable link-time optimization. -flto-compression-level= Use zlib compression level for IL Partition functions and vars at linktime based on object files they originate from Partition functions and vars at linktime into approximately same sized buckets Disable partioning and streaming Report various link-time optimization statistics Link-time optimization with number of parallel jobs or jobserver. Run the link-time optimizer in local transformation (LTRANS) mode. Specify a file to which a list of files output by LTRANS is written. Set errno after built-in math functions -fmax-array-constructor= Maximum number of objects in an array constructor -fmax-errors= Maximum number of errors to report -fmax-identifier-length= Maximum identifier length -fmax-stack-var-size= Size in bytes of the largest array that will be put on the stack -fmax-subrecord-length= Maximum length for subrecords Report on permanent memory allocation Attempt to merge identical constants and constant variables Attempt to merge identical constants across compilation units Attempt to merge identical debug strings across compilation units -fmessage-length= Limit diagnostics to characters per line. 0 suppresses line-wrapping Set default accessibility of module entities to PRIVATE. Perform SMS based modulo scheduling before the first scheduling pass Perform SMS based modulo scheduling with register moves allowed Move loop invariant computations out of loops Don't warn about uses of Microsoft extensions Add mudflap bounds-checking instrumentation for single-threaded program Ignore read operations when inserting mudflap instrumentation Add mudflap bounds-checking instrumentation for multi-threaded program Generate code for NeXT (Apple Mac OS X) runtime environment Assume that receivers of Objective-C messages may be nil Support synchronous non-call exceptions Treat a throw() exception specification as noexcept to improve code size Specify which ABI to use for Objective-C family code and meta-data generation. Generate special Objective-C methods to initialize/destroy non-POD C++ ivars, if needed Allow fast jumps to the message dispatcher Enable Objective-C exception and synchronization syntax Enable garbage collection (GC) in Objective-C/Objective-C++ programs Enable inline checks for nil receivers with the NeXT runtime and ABI version 2. Enable Objective-C setjmp exception handling runtime Conform to the Objective-C 1.0 language as implemented in GCC 4.0 When possible do not generate stack frames Enable OpenMP (implies -frecursive in Fortran) Recognize C++ keywords like "compl" and "xor" Enable verbose informational messages for optimizations (same as -fopt-info=1) -fopt-info=[0|1|2|3] Set the verbose level of informational messages for optimizations Optimization based on improving memory reference locality. Do the full register move optimization pass Optimize sibling and tail recursive calls -foptimize-static-class-initialization Enable optimization of static class initialization code Try to lay out derived types as compactly as possible Pack structure members together without holes -fpack-struct= Set initial maximum structure member alignment Return small aggregates in memory, not registers Look for and use PCH files even when preprocessing Enable machine specific peephole optimizations Enable an RTL peephole pass before sched2 Downgrade conformance errors to warnings Generate position-independent code if possible (small mode) Generate position-independent code for executables if possible (small mode) Enable Plan 9 language extensions -fplugin-arg--[=] Specify argument = for plugin -fpmu-profile-generate=[load-latency] Generate pmu profile for cache misses. Currently only pfmon based load latency profiling is supported on Intel/PEBS and AMD/IBS platforms. -fpmu-profile-use=[load-latency] Use pmu profile data while optimizing. Currently only perfmon based load latency profiling is supported on Intel/PEBS and AMD/IBS platforms. Report on memory allocation before interprocedural optimization Run predictive commoning optimization. Generate prefetch instructions, if available, for arrays in loops Treat the input file as already preprocessed -fno-pretty-templates Do not pretty-print template specializations as the template signature followed by the arguments Enable basic program profiling code Insert arc-based program profiling code Enable correction of flow inconsistent profile data input Set the top-level directory for storing the profile data. The default is 'pwd'. Dump CFG profile for comparison. Enable common options for generating profile info for profile feedback directed optimizations Turn on instrumentation sampling with -fprofile-generate with rate set by --param profile-generate-sampling-rate or environment variable GCOV_SAMPLING_RATE Enable common options for generating profile info for profile feedback directed optimizations, and set -fprofile-dir= Profile generation for memory reuse distance. Enable common options for performing profile feedback directed optimizations Enable common options for performing profile feedback directed optimizations, and set -fprofile-dir= Insert code to profile values of expressions Protect parentheses in expressions -frandom-seed= Make compile reproducible using Enable range checking during compilation Reallocate the LHS in assignments Same as -fassociative-math for expressions which include division. Record gcc command line switches in the object file. Record the compiler optimizations in a .gnu.switches.text section. Use a 4-byte record marker for unformatted files Use an 8-byte record marker for unformatted files Allocate local variables on the stack to allow indirect recursion Reduce the amount of reflection meta-data generated Return small aggregates in registers Enables a register move optimization Perform a register renaming optimization pass Reorder basic blocks to improve code placement -freorder-blocks-and-partition Reorder basic blocks and partition into hot and cold sections Reorder functions to improve code placement Copy array sections into a contiguous block on procedure entry Used in Fix-and-Continue mode to indicate that object files may be swapped in at runtime Enable automatic template instantiation Functions which return values must end with return statements Add a common subexpression elimination pass after loop optimizations -freschedule-modulo-scheduled-loops Enable/Disable the traditional scheduling in loops that already passed modulo scheduling Perform Dynamic Inter-Procedural Analysis. Don't import an auxiliary module if it contains asm statements Don't import an auxiliary module if the command line options mismatch with the primary module -fripa-no-promote-always-inline-func Don't promote always inline static functions assuming they will be inlined and no copy is needed. Limit non-const non-FP loop peeling under dynamic IPA estimates of large code footprint Limit non-const non-FP loop unrolling under dynamic IPA estimates of large code footprint Disable optimizations that assume default FP rounding behavior Generate run time type descriptor information -fsched-critical-path-heuristic Enable the critical path heuristic in the scheduler Enable the dependent count heuristic in the scheduler Enable the group heuristic in the scheduler Enable scheduling across basic blocks Enable the last instruction heuristic in the scheduler Enable register pressure sensitive insn scheduling Enable the rank heuristic in the scheduler Allow speculative motion of non-loads Enable the speculative instruction heuristic in the scheduler Allow speculative motion of some loads Allow speculative motion of more loads Allow premature scheduling of queued insns Set dependence distance checking in premature scheduling of queued insns -fsched-stalled-insns-dep= Set dependence distance checking in premature scheduling of queued insns -fsched-stalled-insns= Set number of queued insns that can be prematurely scheduled -fsched-verbose= Set the verbosity level of the scheduler If scheduling post reload, do superblock scheduling Reschedule instructions before register allocation Reschedule instructions after register allocation Append a second underscore if the name already contains an underscore Access data in the same section from shared anchor points Perform software pipelining of inner loops during selective scheduling -fsel-sched-pipelining-outer-loops Perform software pipelining of outer loops during selective scheduling -fsel-sched-reschedule-pipelined Reschedule pipelined regions without pipelining Schedule instructions using selective scheduling algorithm Run selective scheduling after reload Use the same size for double as for float Use the narrowest integer type possible for enumeration types Force the underlying type for "wchar_t" to be "unsigned short" Show column numbers in diagnostics, when available. Default on Apply negative sign to zero values Disable optimizations observable by IEEE signaling NaNs When "signed" or "unsigned" is not given make the bitfield signed Disable floating point optimizations that ignore the IEEE signedness of zero Convert floating point constants to single precision constants Support delete operator with objetc's size as the second parameter. Set the source language version Split lifetimes of induction variables when loops are unrolled Generate discontiguous stack frames Split wide types into independent registers Insert stack checking code into the program. Same as -fstack-check=specific -fstack-check=[no|generic|specific] Insert stack checking code into the program -fstack-limit-register= Trap if the stack goes past -fstack-limit-symbol= Trap if the stack goes past symbol Use propolice as a stack protection method Use a stack protection method for every function Use a smart stack protection method for certain functions Output stack usage information on a per-function basis Display statistics accumulated during compilation Enable assignability checks for stores into object arrays Assume strict aliasing rules apply Perform transformations based on enum precision Assume that values of enumeration type are always within the minimum range of that type Treat signed overflow as undefined Force bitfield accesses to match their type width Check for syntax errors, then stop -ftabstop= Distance between tab stops for column reporting -ftemplate-depth= Specify maximum template instantiation depth Create data files needed by "gcov" Perform jump threading optimizations -fno-threadsafe-statics Do not generate thread-safe code for initializing local statics Report the time taken by each compiler pass -ftls-model=[global-dynamic|local-dynamic|initial-exec|local-exec] Set the default thread-local storage code generation model Reorder top level functions, variables, and asms Perform superblock formation via tail duplication Assume floating-point operations can trap Trap for signed overflow in addition, subtraction and multiplication Enable SSA-BIT-CCP optimization on trees Enable conditional dead code elimination for builtin calls Enable SSA-CCP optimization on trees Enable loop header copying on trees Enable copy propagation on trees Replace SSA temporaries with better names in copies Transform condition stores into unconditional ones Enable SSA dead code elimination optimization on trees Enable dominator optimizations Enable forward propagation on trees Enable Full Redundancy Elimination (FRE) on trees -ftree-loop-distribute-patterns Enable loop distribution for patterns transformed into a library call Enable loop distribution on trees Convert conditional jumps in innermost loops to branchless equivalents Also if-convert conditional jumps containing memory writes Enable loop invariant motion on trees Create canonical induction variables in loops Enable loop interchange transforms. Same as -floop-interchange Enable loop optimizations on tree level Perform live range splitting during the SSA->normal pass Enable automatic parallelization of loops Enable hoisting loads from conditional pointers. Enable SSA-PRE optimization on trees Perform function-local points-to analysis on trees. Enable reassociation on tree level Enable copy propagation of scalar-evolution information. Enable SSA code sinking on trees Enable basic block vectorization (SLP) on trees Perform scalar replacement of aggregates Perform conversions of switch initializations. Replace temporary expressions in the SSA->normal pass Enable loop versioning when doing loop vectorization on trees Enable loop vectorization on trees -ftree-vectorizer-verbose= Set the verbosity level of the vectorizer Perform Value Range Propagation on trees Append underscores to externally visible names Compile whole compilation unit at a time Perform loop unrolling for all loops Perform loop unrolling when iteration count is known Allow loop optimizations to assume that the loops behave in normal way Allow math optimizations that may violate IEEE or ISO standards When "signed" or "unsigned" is not given make the bitfield unsigned Make "char" unsigned by default Just generate unwind tables for exception handling Generate code for built-in atomic operations Generate code for the Boehm GC Use __cxa_atexit to register destructors Use __cxa_get_exception_ptr in exception handling Call a library routine to do integer divisions Perform variable tracking by annotating assignments -fvar-tracking-assignments-toggle Toggle -fvar-tracking-assignments Perform variable tracking and also tag variables that are uninitialized -fvariable-expansion-in-unroller Apply variable expansion when loops are unrolled Enable use of cost model in vectorization Add extra commentary to assembler output Marks all inlined methods as having hidden visibility Changes visibility to match Microsoft Visual Studio by default -fvisibility=[default|internal|hidden|protected] Set the default symbol visibility Use expression value profiles in optimizations Emit common-like symbols as weak symbols Construct webs and split unrelated uses of single variable Compile all program units at once and check all interfaces Perform whole program optimizations -fwide-exec-charset= Convert all wide strings and character constants to character set Generate a #line directive pointing at the current working directory Run the link-time optimizer in whole program analysis (WPA) mode. Assume signed arithmetic overflow wraps around Eliminate redundant zero extensions on targets that support implicit extensions. Put zero initialized data in the bss section Generate lazy class lookup (via objc_getClass()) for use in Zero-Link mode Generate debug information in default format Generate debug information in COFF format Generate debug information in DWARF v2 (or later) format Dump declarations to a .decl file Generate debug information in default extended format Generate debug information at level 1 with minimal line table -gnat Specify options to GNAT Emit DWARF additions beyond selected version Generate debug information in STABS format Generate debug information in extended STABS format Don't emit DWARF additions beyond selected version Toggle debug information generation Generate debug information in VMS format Generate debug information in XCOFF format Generate debug information in extended XCOFF format -idirafter Add to the end of the system include path -imacros Accept definition of macros in -imultilib Set to be the multilib include subdirectory -include Include the contents of before other files -iplugindir= Set to be the default plugin directory -iprefix Specify as a prefix for next two options -iquote Add to the end of the quote include path -isysroot Set to be the system root directory -isystem Add to the start of the system include path -iwithprefix Add to the end of the system include path -iwithprefixbefore Add to the end of the main include path Support 3DNow! built-in functions Support Athlon 3Dnow! built-in functions Expand 32bit/64bit integer divide into 8bit unsigned integer divide with run-time check Generate code that conforms to the given ABI Support code generation of Advanced Bit Manipulation (ABM) instructions. Reserve space for outgoing arguments in the function prologue Support AES built-in functions and code generation Align some doubles on dword boundary Function starts are aligned to this power of 2 Jump targets are aligned to this power of 2 Loop code aligned to this power of 2 Align destination of the string operations Generate code for the Android platform. Support MMX, SSE, SSE2, SSE3, SSSE3, SSE4.1, SSE4.2 and AVX built-in functions and code generation Split 32-byte AVX unaligned load -mavx256-split-unaligned-store Split 32-byte AVX unaligned store Support BMI built-in functions and code generation Branches are this expensive (1-5, arbitrary units) Generate cld instruction in the function prologue. %<-mcpu=%> is deprecated; use %<-mtune=%> or %<-march=%> instead Support code generation of crc32 instruction. Support code generation of cmpxchg16b instruction. Do dispatch scheduling if processor is bdver1 and Haifa scheduling is selected. Support F16C built-in functions and code generation Generate sin, cos, sqrt for FPU Emit profiling counter call at function entry before prologue. Support MMX, SSE, SSE2, SSE3, SSSE3, SSE4.1, SSE4.2, AVX and FMA built-in functions and code generation Support FMA4 built-in functions and code generation Always use Dynamic Realigned Argument Pointer (DRAP) to realign stack Return values of functions in FPU registers Generate floating point mathematics using given instruction set Support FSGSBASE built-in functions and code generation %<-mfused-madd%> is deprecated; use %<-ffp-contract=%> instead Use IEEE math for fp comparisons Assume incoming stack aligned to this power of 2 Inline all known string operations -minline-stringops-dynamically Inline memset/memcpy string operations, but perform inline version only for small blocks %<-mintel-syntax%> and %<-mno-intel-syntax%> are deprecated; use %<-masm=intel%> and %<-masm=att%> instead Data greater than given threshold will go into .ldata section in x86-64 medium model Support LWP built-in functions and code generation Support MMX built-in functions Support code generation of movbe instruction. Use native (MS) bitfield layout Do not support SSE4.1 and SSE4.2 built-in functions and code generation Omit the frame pointer in leaf functions Set 80387 floating-point precision (-mpc32, -mpc64, -mpc80) Support PCLMUL built-in functions and code generation Support code generation of popcnt instruction. Use 128-bit AVX instructions instead of 256-bit AVX instructions in the auto-vectorizer. Attempt to keep stack aligned to this power of 2 Use push instructions to save outgoing arguments Support RDRND built-in functions and code generation Generate reciprocals instead of divss and sqrtss. Use red-zone in the x86-64 code Number of registers used to pass integer arguments Support code generation of sahf instruction in 64bit x86-64 code. Support MMX and SSE built-in functions and code generation Support MMX, SSE and SSE2 built-in functions and code generation Encode SSE instructions with VEX prefix Support MMX, SSE, SSE2 and SSE3 built-in functions and code generation Support MMX, SSE, SSE2, SSE3, SSSE3, SSE4.1 and SSE4.2 built-in functions and code generation Support MMX, SSE, SSE2, SSE3, SSSE3 and SSE4.1 built-in functions and code generation Support MMX, SSE, SSE2, SSE3 and SSE4A built-in functions and code generation Use SSE register passing conventions for SF and DF mode Support MMX, SSE, SSE2, SSE3 and SSSE3 built-in functions and code generation Chose strategy to generate stringop using Support TBM built-in functions and code generation Use given thread-local storage dialect Use direct references against %gs when accessing tls data Multiversion for the given CPU(s) Return 8-byte vectors in memory Generate vzeroupper instruction before a transfer of control flow out of the function. Support XOP built-in functions and code generation Do not search standard system include directories (those specified with -isystem will still be used) Do not search standard system include directories for C++ -o Place output into Issue warnings needed for strict compliance to the standard Like -pedantic but issue them as errors Create a position independent executable Generate C header of platform-specific features Do not display functions compiled or elapsed time Remap file names when including files Statically link the GNU Fortran helper library (libgfortran) Conform to the ISO 1998 C++ standard revised by the 2003 technical corrigendum Deprecated in favor of -std=c++11 Conform to the ISO 2011 C++ standard (experimental and incomplete support) Conform to the ISO 201X C standard draft (experimental and incomplete support) Conform to the ISO 1990 C standard Conform to the ISO 1999 C standard Deprecated in favor of -std=c99 Conform to the ISO Fortran 2003 standard Conform to the ISO Fortran 2008 standard Conform to the ISO Fortran 95 standard Conform to nothing in particular Conform to the ISO 1998 C++ standard revised by the 2003 technical corrigendum with GNU extensions Deprecated in favor of -std=gnu++11 Conform to the ISO 2011 C++ standard with GNU extensions (experimental and incomplete support) Conform to the ISO 201X C standard draft with GNU extensions (experimental and incomplete support) Conform to the ISO 1990 C standard with GNU extensions Conform to the ISO 1999 C standard with GNU extensions Deprecated in favor of -std=gnu99 Conform to the ISO 1990 C standard as amended in 1994 Deprecated in favor of -std=iso9899:1999 Accept extensions to support legacy code Enable traditional preprocessing -trigraphs Support ISO C trigraphs Do not predefine system-specific and GCC-specific macros Display the compiler's version unknown IRA algorithm %qs unknown IRA region %qs unknown TLS model %qs LTO ObjC ObjC++ -### --CLASSPATH --all-warnings --ansi --assemble --assert assertion missing after %qs --assert= --bootclasspath --canonical-prefixes --classpath --comments --comments-in-macros --compile --coverage --debug --define-macro macro name missing after %qs --define-macro= --dependencies --dump --dump= --dumpbase --dumpdir --encoding --entry --entry= --extdirs --extra-warnings --for-assembler --for-assembler= --for-linker --for-linker= --force-link --force-link= Display this information --help= --imacros missing filename after %qs --imacros= --include --include-barrier --include-directory missing path after %qs --include-directory-after --include-directory-after= --include-directory= --include-prefix --include-prefix= --include-with-prefix --include-with-prefix-after --include-with-prefix-after= --include-with-prefix-before --include-with-prefix-before= --include-with-prefix= --include= --language --language= --library-directory --library-directory= --no-canonical-prefixes --no-integrated-cpp --no-line-commands --no-standard-includes --no-standard-libraries --no-warnings --optimize --output --output-class-directory --output-class-directory= --output-pch= --output= --param --param= --pass-exit-codes --pedantic --pedantic-errors --pie --pipe --prefix --prefix= --preprocess --print-file-name --print-file-name= --print-libgcc-file-name --print-multi-directory --print-multi-lib --print-multi-os-directory --print-prog-name --print-prog-name= --print-search-dirs --print-sysroot --profile --resource --resource= --save-temps --shared --specs --specs= --static --symbolic --sysroot --sysroot= Alias for --help=target --time --trace-includes --traditional --traditional-cpp --trigraphs --undefine-macro --undefine-macro= --user-dependencies --verbose --write-dependencies --write-user-dependencies -A -B Do not discard comments -CC -E -H -I -J -M Generate make dependencies -MD -MD_ -MF -MG -MM -MMD -MMD_ -MP -MQ -MT -N -Ofast -Os -P -Q -Qn -Qy -R -S -T -Tbss -Tbss= -Tdata -Tdata= -Ttext -Ttext= -U -U Undefine -Wa, -Wabi -Waddress 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-fbtr-bb-exclusive -fbuiltin Recognize built-in functions -fbuiltin- -fcall-saved- -fcall-used- -fcaller-saves -fcallgraph-profiles-sections -fcheck-array-temporaries -fcheck-data-deps -fcheck-new Check the return value of new -fcheck-references -fcheck= -fclasspath= -fclone-hot-version-paths -fcoarray= -fcombine-stack-adjustments -fcommon -fcompare-debug -fcompare-debug-second -fcompare-elim -fcompile-resource= -fcond-mismatch -fconserve-space -fconserve-stack -fconstant-string-class= -fconstexpr-depth= -fconvert=big-endian -fconvert=little-endian -fconvert=native -fconvert=swap -fcprop-registers -fcray-pointer -fcrossjumping -fcse-follow-jumps -fcse-skip-blocks -fcx-fortran-rules -fcx-limited-range -fd-lines-as-code -fd-lines-as-comments -fdata-sections -fdbg-cnt-list -fdbg-cnt= -fdce -fdebug-prefix-map= -fdeduce-init-list -fdefault-double-8 -fdefault-inline -fdefault-integer-8 -fdefault-real-8 -fdefer-pop -fdelayed-branch -fdelete-null-pointer-checks -fdevirtualize -fdiagnostics-show-location= -fdiagnostics-show-option -fdirectives-only Preprocess directives only. -fdisable- -fdisable-assertions -fdisable-assertions= -fdollar-ok -fdollars-in-identifiers -fdse -fdump- -fdump-core -fdump-final-insns -fdump-fortran-optimized -fdump-fortran-original -fdump-go-spec= -fdump-noaddr -fdump-parse-tree -fdump-passes Dump optimization passes -fdump-unnumbered -fdump-unnumbered-links -fdwarf2-cfi-asm -fearly-inlining Perform early inlining -felide-constructors -feliminate-dwarf2-dups -femit-class-debug-always Output a class file -femit-class-files Alias for -femit-class-file -femit-struct-debug-baseonly -femit-struct-debug-detailed= -femit-struct-debug-reduced -fenable- -fenable-assertions -fenable-assertions= -fenable-icf-debug -fencoding= -fenforce-eh-specs -fenum-int-equiv -fexceptions Enable exception handling -fexcess-precision= -fexec-charset= -fexpensive-optimizations -fextdirs= -fextended-identifiers -fexternal-blas -fexternal-templates -ff2c Use f2c 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-fmem-report -fmerge-all-constants -fmerge-constants -fmerge-debug-strings -fmessage-length= -fmodule-private -fmodulo-sched -fmodulo-sched-allow-regmoves -fmove-loop-invariants -fms-extensions -fmudflap -fmudflapir -fmudflapth -fname-mangling-version- -fnew-abi -fnext-runtime -fnil-receivers -fnon-call-exceptions -fnonansi-builtins -fnonnull-objects -fnothrow-opt -fobjc-abi-version= -fobjc-call-cxx-cdtors -fobjc-direct-dispatch -fobjc-exceptions -fobjc-gc -fobjc-nilcheck -fobjc-sjlj-exceptions -fobjc-std=objc1 -fomit-frame-pointer -fopenmp -foperator-names -fopt-info -fopt-info= -foptimize-locality -foptimize-register-move -foptimize-sibling-calls -foptional-diags -foutput-class-dir= -fpack-derived -fpack-struct -fpack-struct= -fpartial-inlining Perform partial inlining -fpcc-struct-return -fpch-deps -fpch-preprocess -fpeel-loops Perform loop peeling -fpeephole -fpeephole2 -fpermissive -fpic -fpie -fplan9-extensions -fplugin-arg- -fplugin= Specify a plugin to load 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-iwithprefix -iwithprefixbefore -k8 -lang-asm -m128bit-long-double sizeof(long double) is 16 -m32 Generate 32bit i386 code -m3dnow -m3dnowa -m64 Generate 64bit x86-64 code -m80387 Use hardware fp -m8bit-idiv -m96bit-long-double sizeof(long double) is 12 -mabi= -maccumulate-outgoing-args -malign-double -malign-functions= -malign-jumps= -malign-loops= -malign-stringops -mandroid -march= Generate code for given CPU -masm= Use given assembler dialect -mavx256-split-unaligned-load -mbionic Use Bionic C library -mbranch-cost= -mcld -mcmodel= Use given x86-64 code model -mcpu= -mcrc32 -mdispatch-scheduler -mf16c -mfancy-math-387 -mfentry -mforce-drap -mfp-ret-in-387 -mfpmath= -mfsgsbase -mfused-madd -mglibc Use GNU C library -mhard-float -mieee-fp -mincoming-stack-boundary= -minline-all-stringops -mintel-syntax intel att -mlarge-data-threshold= -mmmx -mms-bitfields -mno-align-stringops -mno-fancy-math-387 -mno-push-args -mno-red-zone -mno-sse4 -momit-leaf-frame-pointer -mpc -mprefer-avx128 -mpreferred-stack-boundary= -mpush-args -mrdrnd -mrecip -mred-zone -mregparm= -mrtd Alternate calling convention -msoft-float Do not use hardware fp -msse -msse2 -msse2avx -msse3 -msse4 -msse4a -msse5 %<-msse5%> was removed -msseregparm -mssse3 -mstack-arg-probe Enable stack probing -mstackrealign Realign stack in prologue -mstringop-strategy= -mtls-dialect= -mtls-direct-seg-refs -mtune= Schedule code for given CPU -muclibc Use uClibc C library -mvarch= -mveclibabi= Vector library ABI to use -mvect8-ret-in-mem -mvzeroupper -n -nocpp Disable preprocessing -nodefaultlibs -nostartfiles -nostdinc -nostdinc++ -nostdlib -p Enable function profiling -pg -posix -print-objc-runtime-info -print-sysroot-headers-suffix -pthread -quiet -r -rdynamic -remap -s -s-bc-abi -save-temps= Create a shared library -shared-libgcc -static-libgcc -static-libgcj -static-libgfortran -static-libgo -static-libstdc++ -std=c++03 -std=c++0x -std=c++11 -std=c++98 -std=c1x -std=c89 -std=c90 -std=c99 -std=c9x -std=f2003 -std=f2008 -std=f95 -std=gnu -std=gnu++03 -std=gnu++0x -std=gnu++11 -std=gnu++98 -std=gnu1x -std=gnu89 -std=gnu90 -std=gnu99 -std=gnu9x -std=iso9899:1990 -std=iso9899:199409 -std=iso9899:1999 -std=iso9899:199x -std=legacy -t -time= -tno-android-cc -tno-android-ld -u -undef -v Enable verbose output -w Suppress warnings -x -z every-line once standard CB priority mixed internal protected global-dynamic initial-exec local-dynamic local-exec s s s s ` s s i s s i t t 0 t 0t i ` @t Pt e oe e e Yf >f i i i i @ i i j j @ j j r 9j j r Cj Sj @ hj tj t j u j @ j @ j j j w j j w j ~ j k k k k + +k @ 3k @ @ m m B m D @ n n &n k E A /n Hn bn pn k E A zn n D n G @ n H n I n K n L @ n s @ n s @ n x A @ n N @ n N @ o O @ P %o P @ =o Q @ Oo R @ jo T @ |o T @ o U @ o V @ t W @ o F o o o ` @ o b o e @ o e @ o f @ p @ p d @ p @ c $p @
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