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freebsd/contrib/gcc/common.opt
2005-06-03 03:28:44 +00:00

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; Options for the language- and target-independent parts of the compiler.
; Copyright (C) 2003 Free Software Foundation, Inc.
;
; This file is part of GCC.
;
; GCC is free software; you can redistribute it and/or modify it under
; the terms of the GNU General Public License as published by the Free
; Software Foundation; either version 2, or (at your option) any later
; version.
;
; GCC is distributed in the hope that it will be useful, but WITHOUT ANY
; WARRANTY; without even the implied warranty of MERCHANTABILITY or
; FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
; for more details.
;
; You should have received a copy of the GNU General Public License
; along with GCC; see the file COPYING. If not, write to the Free
; Software Foundation, 59 Temple Place - Suite 330, Boston, MA
; 02111-1307, USA.
; See c.opt for a description of this file's format.
; Please try to keep this file in ASCII collating order.
-help
Common
Display this information
-param
Common Separate
--param <param>=<value> Set parameter <param> to value. See below for a complete list of parameters
-target-help
Common
-version
Common
G
Common Joined Separate UInteger
-G<number> Put global and static data smaller than <number> bytes into a special section (on some targets)
O
Common JoinedOrMissing
-O<number> Set optimization level to <number>
Os
Common
Optimize for space rather than speed
W
Common RejectNegative
This switch is deprecated; use -Wextra instead
Waggregate-return
Common
Warn about returning structures, unions or arrays
Wcast-align
Common
Warn about pointer casts which increase alignment
Wdeprecated-declarations
Common
Warn about uses of __attribute__((deprecated)) declarations
Wdisabled-optimization
Common
Warn when an optimization pass is disabled
Werror
Common
Treat all warnings as errors
Wextra
Common
Print extra (possibly unwanted) warnings
Winline
Common
Warn when an inlined function cannot be inlined
Wlarger-than-
Common RejectNegative Joined UInteger
-Wlarger-than-<number> Warn if an object is larger than <number> bytes
Wmissing-noreturn
Common
Warn about functions which might be candidates for __attribute__((noreturn))
Wpacked
Common
Warn when the packed attribute has no effect on struct layout
Wpadded
Common
Warn when padding is required to align structure members
Wshadow
Common
Warn when one local variable shadows another
Wstrict-aliasing
Common
Warn about code which might break strict aliasing rules
Wswitch
Common
Warn about enumerated switches, with no default, missing a case
Wswitch-default
Common
Warn about enumerated switches missing a \"default:\" statement
Wswitch-enum
Common
Warn about all enumerated switches missing a specific case
Wsystem-headers
Common
Do not suppress warnings from system headers
Wuninitialized
Common
Warn about uninitialized automatic variables
Wunreachable-code
Common
Warn about code that will never be executed
Wunused
Common
Enable all -Wunused- warnings
Wunused-function
Common
Warn when a function is unused
Wunused-label
Common
Warn when a label is unused
Wunused-parameter
Common
Warn when a function parameter is unused
Wunused-value
Common
Warn when an expression value is unused
Wunused-variable
Common
Warn when a variable is unused
aux-info
Common Separate
-aux-info <file> Emit declaration information into <file>
aux-info=
Common Joined
auxbase
Common Separate
auxbase-strip
Common Separate
d
Common Joined
-d<letters> Enable dumps from specific passes of the compiler
dumpbase
Common Separate
-dumpbase <file> Set the file basename to be used for dumps
fPIC
Common
fPIE
Common
fabi-version=
Common Joined UInteger
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
-fcall-saved-<register> Mark <register> as being preserved across functions
fcall-used-
Common Joined RejectNegative
-fcall-used-<register> Mark <register> as being corrupted by function calls
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
-fdiagnostics-show-location=[once|every-line] How often to emit source location at the beginning of line-wrapped diagnostics
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
-ffixed-<register> Mark <register> as being unavailable to the compiler
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
fgcse-las
Common
Perform redundant load after store elimination in global common subexpression elimination
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
finline-limit=
Common RejectNegative Joined UInteger
-finline-limit=<number> Limit the size of inlined functions to <number>
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
-fmessage-length=<number> Limit diagnostics to <number> characters per line. 0 suppresses line-wrapping
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
fprofile-generate
Common
Enable common options for generating profile info for profile feedback directed optimizations
fprofile-use
Common
Enable common options for performing profile feedback directed optimizations
fprofile-values
Common
Insert code to profile values of expressions
frandom-seed
Common
frandom-seed=
Common Joined RejectNegative
-frandom-seed=<string> Make compile reproducible using <string>
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
frounding-math
Common
Disable optimizations that assume default FP rounding behavior
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
-fsched-verbose=<number> Set the verbosity level of the scheduler
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
fsched-stalled-insns
Common
Allow premature scheduling of queued insns
fsched-stalled-insns=
Common RejectNegative Joined UInteger
-fsched-stalled-insns=<number> Set number of queued insns that can be prematurely scheduled
fsched-stalled-insns-dep
Common
Set dependence distance checking in premature scheduling of queued insns
fsched-stalled-insns-dep=
Common RejectNegative Joined UInteger
-fsched-stalled-insns-dep=<number> Set dependence distance checking in premature scheduling of queued insns
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
fstack-check
Common
Insert stack checking code into the program
fstack-limit
Common
fstack-limit-register=
Common RejectNegative Joined
-fstack-limit-register=<register> Trap if the stack goes past <register>
fstack-limit-symbol=
Common RejectNegative Joined
-fstack-limit-symbol=<name> Trap if the stack goes past symbol <name>
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
-ftls-model=[global-dynamic|local-dynamic|initial-exec|local-exec] Set the default thread-local storage code generation model
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
fvpt
Common
Use expression value profiles in optimizations
fweb
Common
Construct webs and split unrelated uses of single variable
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
Generate debug information in default format
gcoff
Common JoinedOrMissing
Generate debug information in COFF format
gdwarf-2
Common JoinedOrMissing
Generate debug information in DWARF v2 format
ggdb
Common JoinedOrMissing
Generate debug information in default extended format
gstabs
Common JoinedOrMissing
Generate debug information in STABS format
gstabs+
Common JoinedOrMissing
Generate debug information in extended STABS format
gvms
Common JoinedOrMissing
Generate debug information in VMS format
gxcoff
Common JoinedOrMissing
Generate debug information in XCOFF format
gxcoff+
Common JoinedOrMissing
Generate debug information in extended XCOFF format
m
Common Joined
o
Common Joined Separate
-o <file> Place output into <file>
p
Common
Enable function profiling
pedantic
Common
Issue warnings needed for strict compliance to the standard
pedantic-errors
Common
Like -pedantic but issue them as errors
quiet
Common
Do not display functions compiled or elapsed time
version
Common
Display the compiler's version
w
Common
Suppress warnings
; This comment is to ensure we retain the blank line above.