-param
Common Separate
+--param <param>=<value> Set paramter <param> to value. See below for a complete list of parameters
-target-help
Common
Wsystem-headers
Common
-Suppress warnings from system headers
+Do not suppress warnings from system headers
Wuninitialized
Common
falign-functions
Common
+Align the start of functions
falign-functions=
Common RejectNegative Joined UInteger
falign-jumps
Common
+Align labels which are only reached by jumping
falign-jumps=
Common RejectNegative Joined UInteger
falign-labels
Common
+Align all labels
falign-labels=
Common RejectNegative Joined UInteger
falign-loops
Common
+Align the start of loops
falign-loops=
Common RejectNegative Joined UInteger
fargument-alias
Common
+Specify that arguments may alias each other and globals
fargument-noalias
Common
+Assume arguments may alias globals but not each other
fargument-noalias-global
Common
+Assume arguments alias neither each other nor globals
fasynchronous-unwind-tables
Common
+Generate unwind tables that are exact at each instruction boundary
fbounds-check
Common
+Generate code to check bounds before indexing arrays
fbranch-count-reg
Common
+Replace add, compare, branch with branch on count register
fbranch-probabilities
Common
+Use profiling information for branch probabilities
fbranch-target-load-optimize
Common
+Perform branch target load optimization before prologue / epilogue threading
fbranch-target-load-optimize2
Common
+Perform branch target load optimization after prologue / epilogue threading
fcall-saved-
Common Joined RejectNegative
fcaller-saves
Common
+Save registers around function calls
fcommon
Common
+Do not put uninitialized globals in the common section
fcprop-registers
Common
+Perform a register copy-propagation optimization pass
fcrossjumping
Common
+Perform cross-jumping optimization
fcse-follow-jumps
Common
+When running CSE, follow jumps to their targets
fcse-skip-blocks
Common
+When running CSE, follow conditional jumps
fdata-sections
Common
+Place data items into their own section
fdefer-pop
Common
+Defer popping functions args from stack until later
fdelayed-branch
Common
+Attempt to fill delay slots of branch instructions
fdelete-null-pointer-checks
Common
+Delete useless null pointer checks
fdiagnostics-show-location=
Common Joined RejectNegative
fdump-unnumbered
Common
+Suppress output of instruction numbers and line number notes in debugging dumps
feliminate-dwarf2-dups
Common
+Perform DWARF2 duplicate elimination
feliminate-unused-debug-symbols
Common
+Perform unused type elimination in debug info
feliminate-unused-debug-types
Common
+Perform unused type elimination in debug info
fexceptions
Common
+Enable exception handling
fexpensive-optimizations
Common
+Perform a number of minor, expensive optimizations
ffast-math
Common
ffinite-math-only
Common
+Assume no NaNs or infinities are generated
ffixed-
Common Joined RejectNegative
ffloat-store
Common
+Do not store floats in registers
fforce-addr
Common
+Copy memory address constants into registers before use
fforce-mem
Common
+Copy memory operands into registers before use
ffunction-cse
Common
+Allow function addresses to be held in registers
ffunction-sections
Common
+Place each function into its own section
fgcse
Common
+Perform global common subexpression elimination
fgcse-lm
Common
+Perform enhanced load motion during global common subexpression elimination
fgcse-sm
Common
+Perform store motion after global common subexpression elimination
fgnu-linker
Common
+Output GNU ld formatted global initializers
fguess-branch-probability
Common
+Enable guessing of branch probabilities
fident
Common
+Process #ident directives
fif-conversion
Common
+Perform conversion of conditional jumps to branchless equivalents
fif-conversion2
Common
+Perform conversion of conditional jumps to conditional execution
finhibit-size-directive
Common
+Do not generate .size directives
finline
Common
+Pay attention to the \"inline\" keyword
finline-functions
Common
+Integrate simple functions into their callers
finline-limit-
Common RejectNegative Joined UInteger
finstrument-functions
Common
+Instrument function entry and exit with profiling calls
fkeep-inline-functions
Common
+Generate code for functions even if they are fully inlined
fkeep-static-consts
Common
+Emit static const variables even if they are not used
fleading-underscore
Common
+Give external symbols a leading underscore
floop-optimize
Common
+Perform loop optimizations
fmath-errno
Common
+Set errno after built-in math functions
fmem-report
Common
+Report on permanent memory allocation
fmerge-all-constants
Common
+Attempt to merge identical constants and constant variables
fmerge-constants
Common
+Attempt to merge identical constants across compilation units
fmessage-length=
Common RejectNegative Joined UInteger
fmove-all-movables
Common
+Force all loop invariant computations out of loops
fnew-ra
Common
+Use graph-coloring register allocation
fnon-call-exceptions
Common
+Support synchronous non-call exceptions
fold-unroll-loops
Common
+Perform loop unrolling when iteration count is known
fold-unroll-all-loops
Common
+Perform loop unrolling for all loops
fomit-frame-pointer
Common
+When possible do not generate stack frames
foptimize-register-move
Common
+Do the full register move optimization pass
foptimize-sibling-calls
Common
+Optimize sibling and tail recursive calls
fpack-struct
Common
+Pack structure members together without holes
fpcc-struct-return
Common
+Return small aggregates in memory, not registers
fpeel-loops
Common
+Perform loop peeling
fpeephole
Common
+Enable machine specific peephole optimizations
fpeephole2
Common
+Enable an RTL peephole pass before sched2
fpic
Common
+Generate position-independent code if possible
fpie
Common
+Generate position-independent code for executables if possible
fprefetch-loop-arrays
Common
+Generate prefetch instructions, if available, for arrays in loops
fprofile
Common
+Enable basic program profiling code
fprofile-arcs
Common
+Insert arc-based program profiling code
frandom-seed
Common
freduce-all-givs
Common
+Strength reduce all loop general induction variables
freg-struct-return
Common
+Return small aggregates in registers
fregmove
Common
+Enables a register move optimization
frename-registers
Common
+Perform a register renaming optimization pass
freorder-blocks
Common
+Reorder basic blocks to improve code placement
freorder-functions
Common
+Reorder functions to improve code placement
frerun-cse-after-loop
Common
+Add a common subexpression elimination pass after loop optimizations
frerun-loop-opt
Common
+Run the loop optimizer twice
fsched-interblock
Common
+Enable scheduling across basic blocks
fsched-spec
Common
+Allow speculative motion of non-loads
fsched-spec-load
Common
+Allow speculative motion of some loads
fsched-spec-load-dangerous
Common
+Allow speculative motion of more loads
fsched-verbose=
Common RejectNegative Joined
fsched2-use-superblocks
Common
+If scheduling post reload, do superblock scheduling
fsched2-use-traces
Common
+If scheduling post reload, do trace scheduling
fschedule-insns
Common
+Reschedule instructions before register allocation
fschedule-insns2
Common
+Reschedule instructions after register allocation
fshared-data
Common
+Mark data as shared rather than private
fsignaling-nans
Common
+Disable optimizations observable by IEEE signaling NaNs
fsingle-precision-constant
Common
+Convert floating point constants to single precision constants
fssa
Common
+Enable static single assignment optimizations
fssa-ccp
Common
+Enable SSA conditional constant propagation
fssa-dce
Common
+Enable aggressive SSA dead code elimination
fstack-check
Common
+Insert stack checking code into the program
fstack-limit
Common
fstrength-reduce
Common
+Perform strength reduction optimizations
fstrict-aliasing
Common
+Assume strict aliasing rules apply
fsyntax-only
Common
+Check for syntax errors, then stop
ftest-coverage
Common
+Create data files needed by \"gcov\"
fthread-jumps
Common
+Perform jump threading optimizations
ftime-report
Common
+Report the time taken by each compiler pass
ftls-model=
Common Joined RejectNegative
ftracer
Common
+Perform superblock formation via tail duplication
ftrapping-math
Common
+Assume floating-point operations can trap
ftrapv
Common
+Trap for signed overflow in addition, subtraction and multiplication
funit-at-a-time
Common
+Compile whole compilation unit at a time
funroll-loops
Common
+Perform loop unrolling when iteration count is known
funroll-all-loops
Common
+Perform loop unrolling for all loops
funsafe-math-optimizations
Common
+Allow math optimizations that may violate IEEE or ISO standards
funswitch-loops
Common
+Perform loop unswitching
funwind-tables
Common
+Just generate unwind tables for exception handling
fverbose-asm
Common
+Add extra commentary to assembler output
fwrapv
Common
+Assume signed arithmetic overflow wraps around
fwritable-strings
Common
+Store strings in writable data section
fzero-initialized-in-bss
Common
+Put zero initialized data in the bss section
g
Common JoinedOrMissing
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