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d218e1127b
- Implement -Wvariable-decl. - Port -Wtrampolines support from gcc3. (all three also via OpenBSD) PR: gnu/127136, gnu/157019 Submitted by: Henning Petersen, Pedro Giffuni MFC after: 6 weeks
1163 lines
32 KiB
Plaintext
1163 lines
32 KiB
Plaintext
; Options for the language- and target-independent parts of the compiler.
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; Copyright (C) 2003, 2004, 2005, 2006 Free Software Foundation, Inc.
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;
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; This file is part of GCC.
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;
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; GCC is free software; you can redistribute it and/or modify it under
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; the terms of the GNU General Public License as published by the Free
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; Software Foundation; either version 2, or (at your option) any later
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; version.
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;
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; GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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; WARRANTY; without even the implied warranty of MERCHANTABILITY or
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; FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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; for more details.
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;
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; You should have received a copy of the GNU General Public License
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; along with GCC; see the file COPYING. If not, write to the Free
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; Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
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; 02110-1301, USA.
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; See the GCC internals manual for a description of this file's format.
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; Please try to keep this file in ASCII collating order.
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-help
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Common
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Display this information
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-param
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Common Separate
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--param <param>=<value> Set parameter <param> to value. See below for a complete list of parameters
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-target-help
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Common
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-version
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Common
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G
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Common Joined Separate UInteger
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-G<number> Put global and static data smaller than <number> bytes into a special section (on some targets)
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O
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Common JoinedOrMissing
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-O<number> Set optimization level to <number>
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Os
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Common
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Optimize for space rather than speed
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W
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Common RejectNegative
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This switch is deprecated; use -Wextra instead
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Waggregate-return
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Common Var(warn_aggregate_return)
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Warn about returning structures, unions or arrays
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Wattributes
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Common Var(warn_attributes) Init(1)
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Warn about inappropriate attribute usage
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Wcast-align
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Common Var(warn_cast_align)
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Warn about pointer casts which increase alignment
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Wdeprecated-declarations
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Common Var(warn_deprecated_decl) Init(1)
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Warn about uses of __attribute__((deprecated)) declarations
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Wdisabled-optimization
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Common Var(warn_disabled_optimization)
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Warn when an optimization pass is disabled
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Werror
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Common Var(warnings_are_errors)
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Treat all warnings as errors
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Werror=
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Common Joined
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Treat specified warning as error
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Wextra
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Common
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Print extra (possibly unwanted) warnings
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Wfatal-errors
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Common Var(flag_fatal_errors)
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Exit on the first error occurred
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Winline
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Common Var(warn_inline)
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Warn when an inlined function cannot be inlined
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Wlarger-than-
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Common RejectNegative Joined UInteger
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-Wlarger-than-<number> Warn if an object is larger than <number> bytes
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Wunsafe-loop-optimizations
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Common Var(warn_unsafe_loop_optimizations)
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Warn if the loop cannot be optimized due to nontrivial assumptions.
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Wmissing-noreturn
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Common Var(warn_missing_noreturn)
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Warn about functions which might be candidates for __attribute__((noreturn))
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Woverflow
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Common Var(warn_overflow) Init(1)
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Warn about overflow in arithmetic expressions
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Wpacked
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Common Var(warn_packed)
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Warn when the packed attribute has no effect on struct layout
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Wpadded
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Common Var(warn_padded)
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Warn when padding is required to align structure members
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Wshadow
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Common Var(warn_shadow)
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Warn when one local variable shadows another
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Wstack-protector
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Common Var(warn_stack_protect)
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Warn when not issuing stack smashing protection for some reason
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Wstrict-aliasing
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Common
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Warn about code which might break strict aliasing rules
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Wstrict-aliasing=
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Common Joined UInteger
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Warn about code which might break strict aliasing rules
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Wstrict-overflow
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Common
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Warn about optimizations that assume that signed overflow is undefined
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Wstrict-overflow=
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Common Joined UInteger
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Warn about optimizations that assume that signed overflow is undefined
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Wswitch
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Common Var(warn_switch)
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Warn about enumerated switches, with no default, missing a case
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Wswitch-default
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Common Var(warn_switch_default)
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Warn about enumerated switches missing a \"default:\" statement
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Wswitch-enum
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Common Var(warn_switch_enum)
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Warn about all enumerated switches missing a specific case
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Wsystem-headers
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Common Var(warn_system_headers)
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Do not suppress warnings from system headers
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Wuninitialized
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Common Var(warn_uninitialized)
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Warn about uninitialized automatic variables
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Wunreachable-code
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Common Var(warn_notreached)
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Warn about code that will never be executed
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Wunused
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Common
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Enable all -Wunused- warnings
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Wunused-function
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Common Var(warn_unused_function)
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Warn when a function is unused
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Wunused-label
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Common Var(warn_unused_label)
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Warn when a label is unused
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Wunused-parameter
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Common Var(warn_unused_parameter)
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Warn when a function parameter is unused
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Wunused-value
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Common Var(warn_unused_value)
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Warn when an expression value is unused
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Wunused-variable
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Common Var(warn_unused_variable)
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Warn when a variable is unused
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Wvariable-decl
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Common Var(warn_variable_decl)
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Warn about variable-sized declarations.
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Wvolatile-register-var
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Common Var(warn_register_var)
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Warn when a register variable is declared volatile
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aux-info
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Common Separate
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-aux-info <file> Emit declaration information into <file>
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aux-info=
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Common Joined
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auxbase
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Common Separate
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auxbase-strip
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Common Separate
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d
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Common Joined
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-d<letters> Enable dumps from specific passes of the compiler
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dumpbase
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Common Separate
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-dumpbase <file> Set the file basename to be used for dumps
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; The version of the C++ ABI in use. The following values are allowed:
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;
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; 0: The version of the ABI believed most conformant with the C++ ABI
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; specification. This ABI may change as bugs are discovered and fixed.
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; Therefore, 0 will not necessarily indicate the same ABI in different
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; versions of G++.
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;
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; 1: The version of the ABI first used in G++ 3.2.
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;
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; Additional positive integers will be assigned as new versions of
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; the ABI become the default version of the ABI.
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fabi-version=
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Common Joined UInteger Var(flag_abi_version) Init(2)
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falign-functions
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Common Report Var(align_functions,0)
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Align the start of functions
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falign-functions=
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Common RejectNegative Joined UInteger
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falign-jumps
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Common Report Var(align_jumps,0)
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Align labels which are only reached by jumping
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falign-jumps=
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Common RejectNegative Joined UInteger
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falign-labels
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Common Report Var(align_labels,0)
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Align all labels
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falign-labels=
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Common RejectNegative Joined UInteger
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falign-loops
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Common Report Var(align_loops)
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Align the start of loops
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falign-loops=
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Common RejectNegative Joined UInteger
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; This flag is only tested if alias checking is enabled.
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; 0 if pointer arguments may alias each other. True in C.
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; 1 if pointer arguments may not alias each other but may alias
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; global variables.
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; 2 if pointer arguments may not alias each other and may not
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; alias global variables.
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; 3 if pointer arguments may not alias anything. True in Fortran.
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; Set by the front end.
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fargument-alias
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Common Report Var(flag_argument_noalias,0)
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Specify that arguments may alias each other and globals
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fargument-noalias
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Common Report Var(flag_argument_noalias,1) VarExists
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Assume arguments may alias globals but not each other
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fargument-noalias-global
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Common Report Var(flag_argument_noalias,2) VarExists
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Assume arguments alias neither each other nor globals
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fargument-noalias-anything
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Common Report Var(flag_argument_noalias,3) VarExists
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Assume arguments alias no other storage
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fasynchronous-unwind-tables
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Common Report Var(flag_asynchronous_unwind_tables)
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Generate unwind tables that are exact at each instruction boundary
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; -fcheck-bounds causes gcc to generate array bounds checks.
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; For C, C++ and ObjC: defaults off.
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; For Java: defaults to on.
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; For Fortran: defaults to off.
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fbounds-check
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Common Report Var(flag_bounds_check)
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Generate code to check bounds before indexing arrays
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fbranch-count-reg
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Common Report Var(flag_branch_on_count_reg) Init(1)
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Replace add, compare, branch with branch on count register
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fbranch-probabilities
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Common Report Var(flag_branch_probabilities)
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Use profiling information for branch probabilities
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fbranch-target-load-optimize
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Common Report Var(flag_branch_target_load_optimize)
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Perform branch target load optimization before prologue / epilogue threading
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fbranch-target-load-optimize2
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Common Report Var(flag_branch_target_load_optimize2)
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Perform branch target load optimization after prologue / epilogue threading
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fbtr-bb-exclusive
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Common Report Var(flag_btr_bb_exclusive)
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Restrict target load migration not to re-use registers in any basic block
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fcall-saved-
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Common Joined RejectNegative
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-fcall-saved-<register> Mark <register> as being preserved across functions
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fcall-used-
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Common Joined RejectNegative
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-fcall-used-<register> Mark <register> as being corrupted by function calls
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; Nonzero for -fcaller-saves: allocate values in regs that need to
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; be saved across function calls, if that produces overall better code.
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; Optional now, so people can test it.
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fcaller-saves
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Common Report Var(flag_caller_saves)
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Save registers around function calls
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fcommon
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Common Report Var(flag_no_common,0)
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Do not put uninitialized globals in the common section
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fcprop-registers
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Common Report Var(flag_cprop_registers)
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Perform a register copy-propagation optimization pass
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fcrossjumping
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Common Report Var(flag_crossjumping)
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Perform cross-jumping optimization
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fcse-follow-jumps
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Common Report Var(flag_cse_follow_jumps)
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When running CSE, follow jumps to their targets
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fcse-skip-blocks
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Common Report Var(flag_cse_skip_blocks)
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When running CSE, follow conditional jumps
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fcx-limited-range
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Common Report Var(flag_cx_limited_range)
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Omit range reduction step when performing complex division
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fdata-sections
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Common Report Var(flag_data_sections)
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Place data items into their own section
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; Nonzero for -fdefer-pop: don't pop args after each function call
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; instead save them up to pop many calls' args with one insns.
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fdefer-pop
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Common Report Var(flag_defer_pop)
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Defer popping functions args from stack until later
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fdelayed-branch
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Common Report Var(flag_delayed_branch)
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Attempt to fill delay slots of branch instructions
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fdelete-null-pointer-checks
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Common Report Var(flag_delete_null_pointer_checks)
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Delete useless null pointer checks
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fdiagnostics-show-location=
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Common Joined RejectNegative
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-fdiagnostics-show-location=[once|every-line] How often to emit source location at the beginning of line-wrapped diagnostics
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fdiagnostics-show-option
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Common
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Amend appropriate diagnostic messages with the command line option that controls them
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fdump-
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Common Joined RejectNegative
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-fdump-<type> Dump various compiler internals to a file
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fdump-noaddr
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Common Report Var(flag_dump_noaddr)
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Suppress output of addresses in debugging dumps
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fdump-unnumbered
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Common Report Var(flag_dump_unnumbered) VarExists
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Suppress output of instruction numbers, line number notes and addresses in debugging dumps
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fearly-inlining
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Common Report Var(flag_early_inlining) Init(1)
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Perform early inlining
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feliminate-dwarf2-dups
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Common Report Var(flag_eliminate_dwarf2_dups)
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Perform DWARF2 duplicate elimination
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feliminate-unused-debug-symbols
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Common Report Var(flag_debug_only_used_symbols)
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Perform unused type elimination in debug info
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feliminate-unused-debug-types
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Common Report Var(flag_eliminate_unused_debug_types) Init(1)
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Perform unused type elimination in debug info
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femit-class-debug-always
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Common Report Var(flag_emit_class_debug_always) Init(1)
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Do not suppress C++ class debug information.
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fexceptions
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Common Report Var(flag_exceptions)
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Enable exception handling
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fexpensive-optimizations
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Common Report Var(flag_expensive_optimizations)
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Perform a number of minor, expensive optimizations
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ffast-math
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Common
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ffinite-math-only
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Common Report Var(flag_finite_math_only)
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Assume no NaNs or infinities are generated
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ffixed-
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Common Joined RejectNegative
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-ffixed-<register> Mark <register> as being unavailable to the compiler
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ffloat-store
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Common Report Var(flag_float_store)
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Don't allocate floats and doubles in extended-precision registers
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; Nonzero for -fforce-addr: load memory address into a register before
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; reference to memory. This makes better cse but slower compilation.
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fforce-addr
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Common Report Var(flag_force_addr)
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Copy memory address constants into registers before use
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; Nonzero for -fforce-mem: load memory value into a register
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; before arithmetic on it. This makes better cse but slower compilation.
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fforce-mem
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Common Report Var(flag_force_mem)
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Copy memory operands into registers before use
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; Nonzero means don't put addresses of constant functions in registers.
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; Used for compiling the Unix kernel, where strange substitutions are
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; done on the assembly output.
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ffunction-cse
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Common Report Var(flag_no_function_cse,0)
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Allow function addresses to be held in registers
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ffunction-sections
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Common Report Var(flag_function_sections)
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Place each function into its own section
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fgcse
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Common Report Var(flag_gcse)
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Perform global common subexpression elimination
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fgcse-lm
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Common Report Var(flag_gcse_lm) Init(1)
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Perform enhanced load motion during global common subexpression elimination
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fgcse-sm
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Common Report Var(flag_gcse_sm) Init(0)
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Perform store motion after global common subexpression elimination
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fgcse-las
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Common Report Var(flag_gcse_las) Init(0)
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Perform redundant load after store elimination in global common subexpression
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elimination
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fgcse-after-reload
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Common Report Var(flag_gcse_after_reload)
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Perform global common subexpression elimination after register allocation
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has finished
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fguess-branch-probability
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Common Report Var(flag_guess_branch_prob)
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Enable guessing of branch probabilities
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; Nonzero means ignore `#ident' directives. 0 means handle them.
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; Generate position-independent code for executables if possible
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; On SVR4 targets, it also controls whether or not to emit a
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; string identifying the compiler.
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fident
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Common Report Var(flag_no_ident,0)
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Process #ident directives
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fif-conversion
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Common Report Var(flag_if_conversion)
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Perform conversion of conditional jumps to branchless equivalents
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fif-conversion2
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Common Report Var(flag_if_conversion2)
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Perform conversion of conditional jumps to conditional execution
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; -finhibit-size-directive inhibits output of .size for ELF.
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; This is used only for compiling crtstuff.c,
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; and it may be extended to other effects
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; needed for crtstuff.c on other systems.
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finhibit-size-directive
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Common Report Var(flag_inhibit_size_directive)
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Do not generate .size directives
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; Nonzero means that functions declared `inline' will be treated
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; as `static'. Prevents generation of zillions of copies of unused
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; static inline functions; instead, `inlines' are written out
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; only when actually used. Used in conjunction with -g. Also
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; does the right thing with #pragma interface.
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finline
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Common Report Var(flag_no_inline,0) Init(2)
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Pay attention to the \"inline\" keyword
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finline-functions
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Common Report Var(flag_inline_functions)
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Integrate simple functions into their callers
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finline-functions-called-once
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Common Report Var(flag_inline_functions_called_once) Init(1)
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Integrate functions called once into their callers
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finline-limit-
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Common RejectNegative Joined UInteger
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finline-limit=
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Common RejectNegative Joined UInteger
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-finline-limit=<number> Limit the size of inlined functions to <number>
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finstrument-functions
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Common Report Var(flag_instrument_function_entry_exit)
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Instrument function entry and exit with profiling calls
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fipa-cp
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Common Report Var(flag_ipa_cp)
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Perform Interprocedural constant propagation
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fipa-pure-const
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Common Report Var(flag_ipa_pure_const) Init(0)
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Discover pure and const functions
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fipa-pta
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Common Report Var(flag_ipa_pta) Init(0)
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Perform interprocedural points-to analysis
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fipa-reference
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Common Report Var(flag_ipa_reference) Init(0)
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Discover readonly and non addressable static variables
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fipa-type-escape
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Common Report Var(flag_ipa_type_escape) Init(0)
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Type based escape and alias analysis
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fivopts
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Common Report Var(flag_ivopts) Init(1)
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Optimize induction variables on trees
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fjump-tables
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Common Var(flag_jump_tables) Init(1)
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Use jump tables for sufficiently large switch statements
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|
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fkeep-inline-functions
|
|
Common Report Var(flag_keep_inline_functions)
|
|
Generate code for functions even if they are fully inlined
|
|
|
|
fkeep-static-consts
|
|
Common Report 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)
|
|
Give external symbols a leading underscore
|
|
|
|
floop-optimize
|
|
Common
|
|
Does nothing. Preserved for backward compatibility.
|
|
|
|
fmath-errno
|
|
Common Report Var(flag_errno_math) Init(0)
|
|
Set errno after built-in math functions
|
|
|
|
fmem-report
|
|
Common Report Var(mem_report)
|
|
Report on permanent memory allocation
|
|
|
|
; 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)
|
|
Attempt to merge identical constants and constant variables
|
|
|
|
fmerge-constants
|
|
Common Report Var(flag_merge_constants,1) VarExists
|
|
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
|
|
|
|
fmodulo-sched
|
|
Common Report Var(flag_modulo_sched)
|
|
Perform SMS based modulo scheduling before the first scheduling pass
|
|
|
|
fmove-loop-invariants
|
|
Common Report Var(flag_move_loop_invariants) Init(1)
|
|
Move loop invariant computations out of loops
|
|
|
|
fmudflap
|
|
Common RejectNegative Report Var(flag_mudflap)
|
|
Add mudflap bounds-checking instrumentation for single-threaded program
|
|
|
|
fmudflapth
|
|
Common RejectNegative Report VarExists Var(flag_mudflap,2)
|
|
Add mudflap bounds-checking instrumentation for multi-threaded program
|
|
|
|
fmudflapir
|
|
Common RejectNegative Report Var(flag_mudflap_ignore_reads)
|
|
Ignore read operations when inserting mudflap instrumentation
|
|
|
|
freschedule-modulo-scheduled-loops
|
|
Common Report Var(flag_resched_modulo_sched)
|
|
Enable/Disable the traditional scheduling in loops that already passed modulo scheduling
|
|
|
|
fnon-call-exceptions
|
|
Common Report Var(flag_non_call_exceptions)
|
|
Support synchronous non-call exceptions
|
|
|
|
fomit-frame-pointer
|
|
Common Report Var(flag_omit_frame_pointer)
|
|
When possible do not generate stack frames
|
|
|
|
foptimize-register-move
|
|
Common Report Var(flag_regmove)
|
|
Do the full register move optimization pass
|
|
|
|
foptimize-sibling-calls
|
|
Common Report Var(flag_optimize_sibling_calls)
|
|
Optimize sibling and tail recursive calls
|
|
|
|
fpack-struct
|
|
Common Report Var(flag_pack_struct)
|
|
Pack structure members together without holes
|
|
|
|
fpack-struct=
|
|
Common RejectNegative Joined UInteger
|
|
-fpack-struct=<number> Set initial maximum structure member alignment
|
|
|
|
fpcc-struct-return
|
|
Common Report Var(flag_pcc_struct_return,1) VarExists
|
|
Return small aggregates in memory, not registers
|
|
|
|
fpeel-loops
|
|
Common Report Var(flag_peel_loops)
|
|
Perform loop peeling
|
|
|
|
fpeephole
|
|
Common Report Var(flag_no_peephole,0)
|
|
Enable machine specific peephole optimizations
|
|
|
|
fpeephole2
|
|
Common Report Var(flag_peephole2)
|
|
Enable an RTL peephole pass before sched2
|
|
|
|
fPIC
|
|
Common Report Var(flag_pic,2)
|
|
Generate position-independent code if possible (large mode)
|
|
|
|
fPIE
|
|
Common Report Var(flag_pie,2)
|
|
Generate position-independent code for executables if possible (large mode)
|
|
|
|
fpic
|
|
Common Report Var(flag_pic,1) VarExists
|
|
Generate position-independent code if possible (small mode)
|
|
|
|
fpie
|
|
Common Report Var(flag_pie,1) VarExists
|
|
Generate position-independent code for executables if possible (small mode)
|
|
|
|
fprefetch-loop-arrays
|
|
Common Report Var(flag_prefetch_loop_arrays)
|
|
Generate prefetch instructions, if available, for arrays in loops
|
|
|
|
fprofile
|
|
Common Report Var(profile_flag)
|
|
Enable basic program profiling code
|
|
|
|
fprofile-arcs
|
|
Common Report Var(profile_arc_flag)
|
|
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 Report Var(flag_profile_values)
|
|
Insert code to profile values of expressions
|
|
|
|
frandom-seed
|
|
Common
|
|
|
|
frandom-seed=
|
|
Common Joined RejectNegative
|
|
-frandom-seed=<string> Make compile reproducible using <string>
|
|
|
|
freg-struct-return
|
|
Common Report Var(flag_pcc_struct_return,0) VarExists
|
|
Return small aggregates in registers
|
|
|
|
fregmove
|
|
Common Report Var(flag_regmove)
|
|
Enables a register move optimization
|
|
|
|
frename-registers
|
|
Common Report Var(flag_rename_registers) Init(2)
|
|
Perform a register renaming optimization pass
|
|
|
|
freorder-blocks
|
|
Common Report Var(flag_reorder_blocks)
|
|
Reorder basic blocks to improve code placement
|
|
|
|
freorder-blocks-and-partition
|
|
Common Report Var(flag_reorder_blocks_and_partition)
|
|
Reorder basic blocks and partition into hot and cold sections
|
|
|
|
freorder-functions
|
|
Common Report Var(flag_reorder_functions)
|
|
Reorder functions to improve code placement
|
|
|
|
frerun-cse-after-loop
|
|
Common Report Var(flag_rerun_cse_after_loop) Init(2)
|
|
Add a common subexpression elimination pass after loop optimizations
|
|
|
|
frerun-loop-opt
|
|
Common
|
|
Does nothing. Preserved for backward compatibility.
|
|
|
|
frounding-math
|
|
Common Report Var(flag_rounding_math)
|
|
Disable optimizations that assume default FP rounding behavior
|
|
|
|
fsched-interblock
|
|
Common Report Var(flag_schedule_interblock) Init(1)
|
|
Enable scheduling across basic blocks
|
|
|
|
fsched-spec
|
|
Common Report Var(flag_schedule_speculative) Init(1)
|
|
Allow speculative motion of non-loads
|
|
|
|
fsched-spec-load
|
|
Common Report Var(flag_schedule_speculative_load)
|
|
Allow speculative motion of some loads
|
|
|
|
fsched-spec-load-dangerous
|
|
Common Report Var(flag_schedule_speculative_load_dangerous)
|
|
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 Report Var(flag_sched2_use_superblocks)
|
|
If scheduling post reload, do superblock scheduling
|
|
|
|
fsched2-use-traces
|
|
Common Report Var(flag_sched2_use_traces)
|
|
If scheduling post reload, do trace scheduling
|
|
|
|
fschedule-insns
|
|
Common Report Var(flag_schedule_insns)
|
|
Reschedule instructions before register allocation
|
|
|
|
fschedule-insns2
|
|
Common Report Var(flag_schedule_insns_after_reload)
|
|
Reschedule instructions after register allocation
|
|
|
|
; 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)
|
|
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
|
|
|
|
; sched_stalled_insns_dep controls how many recently scheduled cycles will
|
|
; be examined for a dependency on a stalled insn that is candidate for
|
|
; 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)
|
|
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
|
|
|
|
fsection-anchors
|
|
Common Report Var(flag_section_anchors)
|
|
Access data in the same section from shared anchor points
|
|
|
|
frtl-abstract-sequences
|
|
Common Report Var(flag_rtl_seqabstr)
|
|
Perform sequence abstraction optimization on RTL
|
|
|
|
fsee
|
|
Common Report Var(flag_see) Init(0)
|
|
Eliminate redundant sign extensions using LCM.
|
|
|
|
fshow-column
|
|
Common C ObjC C++ ObjC++ Report Var(flag_show_column) Init(1)
|
|
Show column numbers in diagnostics, when available. Default on
|
|
|
|
fsignaling-nans
|
|
Common Report Var(flag_signaling_nans)
|
|
Disable optimizations observable by IEEE signaling NaNs
|
|
|
|
fsingle-precision-constant
|
|
Common Report Var(flag_single_precision_constant)
|
|
Convert floating point constants to single precision constants
|
|
|
|
fsplit-ivs-in-unroller
|
|
Common Report Var(flag_split_ivs_in_unroller) Init(1)
|
|
Split lifetimes of induction variables when loops are unrolled
|
|
|
|
fvariable-expansion-in-unroller
|
|
Common Report Var(flag_variable_expansion_in_unroller)
|
|
Apply variable expansion when loops are unrolled
|
|
|
|
; Emit code to probe the stack, to help detect stack overflow; also
|
|
; may cause large objects to be allocated dynamically.
|
|
fstack-check
|
|
Common Report Var(flag_stack_check)
|
|
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>
|
|
|
|
fstack-protector
|
|
Common Report Var(flag_stack_protect, 1)
|
|
Use propolice as a stack protection method
|
|
|
|
fstack-protector-all
|
|
Common Report RejectNegative Var(flag_stack_protect, 2) VarExists
|
|
Use a stack protection method for every function
|
|
|
|
fstrength-reduce
|
|
Common
|
|
Does nothing. Preserved for backward compatibility.
|
|
|
|
; Nonzero if we should do (language-dependent) alias analysis.
|
|
; Typically, this analysis will assume that expressions of certain
|
|
; 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)
|
|
Assume strict aliasing rules apply
|
|
|
|
fstrict-overflow
|
|
Common Report Var(flag_strict_overflow)
|
|
Treat signed overflow as undefined
|
|
|
|
fsyntax-only
|
|
Common Report Var(flag_syntax_only)
|
|
Check for syntax errors, then stop
|
|
|
|
ftest-coverage
|
|
Common Report Var(flag_test_coverage)
|
|
Create data files needed by \"gcov\"
|
|
|
|
fthread-jumps
|
|
Common Report Var(flag_thread_jumps)
|
|
Perform jump threading optimizations
|
|
|
|
ftime-report
|
|
Common Report Var(time_report)
|
|
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
|
|
|
|
ftoplevel-reorder
|
|
Common Report Var(flag_toplevel_reorder) Init(1)
|
|
Reorder top level functions, variables, and asms
|
|
|
|
ftracer
|
|
Common Report Var(flag_tracer)
|
|
Perform superblock formation via tail duplication
|
|
|
|
; Zero means that floating-point math operations cannot generate a
|
|
; (user-visible) trap. This is the case, for example, in nonstop
|
|
; IEEE 754 arithmetic.
|
|
ftrapping-math
|
|
Common Report Var(flag_trapping_math) Init(1)
|
|
Assume floating-point operations can trap
|
|
|
|
ftrapv
|
|
Common Report Var(flag_trapv)
|
|
Trap for signed overflow in addition, subtraction and multiplication
|
|
|
|
ftree-ccp
|
|
Common Report Var(flag_tree_ccp)
|
|
Enable SSA-CCP optimization on trees
|
|
|
|
ftree-store-ccp
|
|
Common Report Var(flag_tree_store_ccp)
|
|
Enable SSA-CCP optimization for stores and loads
|
|
|
|
ftree-ch
|
|
Common Report Var(flag_tree_ch)
|
|
Enable loop header copying on trees
|
|
|
|
ftree-combine-temps
|
|
Common Report Var(flag_tree_combine_temps)
|
|
Coalesce memory temporaries in the SSA->normal pass
|
|
|
|
ftree-copyrename
|
|
Common Report Var(flag_tree_copyrename)
|
|
Replace SSA temporaries with better names in copies
|
|
|
|
ftree-copy-prop
|
|
Common Report Var(flag_tree_copy_prop)
|
|
Enable copy propagation on trees
|
|
|
|
ftree-store-copy-prop
|
|
Common Report Var(flag_tree_store_copy_prop)
|
|
Enable copy propagation for stores and loads
|
|
|
|
ftree-dce
|
|
Common Report Var(flag_tree_dce)
|
|
Enable SSA dead code elimination optimization on trees
|
|
|
|
ftree-dominator-opts
|
|
Common Report Var(flag_tree_dom)
|
|
Enable dominator optimizations
|
|
|
|
ftree-dse
|
|
Common Report Var(flag_tree_dse)
|
|
Enable dead store elimination
|
|
|
|
ftree-fre
|
|
Common Report Var(flag_tree_fre)
|
|
Enable Full Redundancy Elimination (FRE) on trees
|
|
|
|
ftree-loop-im
|
|
Common Report Var(flag_tree_loop_im) Init(1)
|
|
Enable loop invariant motion on trees
|
|
|
|
ftree-loop-linear
|
|
Common Report Var(flag_tree_loop_linear)
|
|
Enable linear loop transforms on trees
|
|
|
|
ftree-loop-ivcanon
|
|
Common Report Var(flag_tree_loop_ivcanon) Init(1)
|
|
Create canonical induction variables in loops
|
|
|
|
ftree-loop-optimize
|
|
Common Report Var(flag_tree_loop_optimize) Init(1)
|
|
Enable loop optimizations on tree level
|
|
|
|
ftree-pre
|
|
Common Report Var(flag_tree_pre)
|
|
Enable SSA-PRE optimization on trees
|
|
|
|
ftree-salias
|
|
Common Report Var(flag_tree_salias)
|
|
Perform structural alias analysis
|
|
|
|
ftree-sink
|
|
Common Report Var(flag_tree_sink)
|
|
Enable SSA code sinking on trees
|
|
|
|
ftree-sra
|
|
Common Report Var(flag_tree_sra)
|
|
Perform scalar replacement of aggregates
|
|
|
|
ftree-ter
|
|
Common Report Var(flag_tree_ter)
|
|
Replace temporary expressions in the SSA->normal pass
|
|
|
|
ftree-lrs
|
|
Common Report Var(flag_tree_live_range_split)
|
|
Perform live range splitting during the SSA->normal pass
|
|
|
|
ftree-vrp
|
|
Common Report Var(flag_tree_vrp) Init(0)
|
|
Perform Value Range Propagation on trees
|
|
|
|
funit-at-a-time
|
|
Common Report Var(flag_unit_at_a_time)
|
|
Compile whole compilation unit at a time
|
|
|
|
funroll-loops
|
|
Common Report Var(flag_unroll_loops)
|
|
Perform loop unrolling when iteration count is known
|
|
|
|
funroll-all-loops
|
|
Common Report Var(flag_unroll_all_loops)
|
|
Perform loop unrolling for all loops
|
|
|
|
; 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
|
|
funsafe-loop-optimizations
|
|
Common Report Var(flag_unsafe_loop_optimizations)
|
|
Allow loop optimizations to assume that the loops behave in normal way
|
|
|
|
; Nonzero means that unsafe floating-point math optimizations are allowed
|
|
; for the sake of speed. IEEE compliance is not guaranteed, and operations
|
|
; 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)
|
|
Allow math optimizations that may violate IEEE or ISO standards
|
|
|
|
funswitch-loops
|
|
Common Report Var(flag_unswitch_loops)
|
|
Perform loop unswitching
|
|
|
|
funwind-tables
|
|
Common Report Var(flag_unwind_tables)
|
|
Just generate unwind tables for exception handling
|
|
|
|
fvar-tracking
|
|
Common Report Var(flag_var_tracking) VarExists
|
|
Perform variable tracking
|
|
|
|
ftree-vectorize
|
|
Common Report Var(flag_tree_vectorize)
|
|
Enable loop vectorization on trees
|
|
|
|
ftree-vect-loop-version
|
|
Common Report Var(flag_tree_vect_loop_version) Init(1)
|
|
Enable loop versioning when doing loop vectorization on trees
|
|
|
|
ftree-vectorizer-verbose=
|
|
Common RejectNegative Joined
|
|
-ftree-vectorizer-verbose=<number> Set the verbosity level of the vectorizer
|
|
|
|
; -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
|
|
; generated assembly code (perhaps while debugging the compiler itself).
|
|
; -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)
|
|
Add extra commentary to assembler output
|
|
|
|
fvisibility=
|
|
Common Joined RejectNegative
|
|
-fvisibility=[default|internal|hidden|protected] Set the default symbol visibility
|
|
|
|
|
|
fvpt
|
|
Common Report Var(flag_value_profile_transformations)
|
|
Use expression value profiles in optimizations
|
|
|
|
fweb
|
|
Common Report Var(flag_web) Init(2)
|
|
Construct webs and split unrelated uses of single variable
|
|
|
|
fwhole-program
|
|
Common Report Var(flag_whole_program) Init(0)
|
|
Perform whole program optimizations
|
|
|
|
fwrapv
|
|
Common Report Var(flag_wrapv)
|
|
Assume signed arithmetic overflow wraps around
|
|
|
|
fzero-initialized-in-bss
|
|
Common Report Var(flag_zero_initialized_in_bss) Init(1)
|
|
Put zero initialized data in the bss section
|
|
|
|
g
|
|
Common JoinedOrMissing
|
|
Generate debug information in default format
|
|
|
|
gcoff
|
|
Common JoinedOrMissing Negative(gdwarf-2)
|
|
Generate debug information in COFF format
|
|
|
|
gdwarf-2
|
|
Common JoinedOrMissing Negative(gstabs)
|
|
Generate debug information in DWARF v2 format
|
|
|
|
ggdb
|
|
Common JoinedOrMissing
|
|
Generate debug information in default extended format
|
|
|
|
gstabs
|
|
Common JoinedOrMissing Negative(gstabs+)
|
|
Generate debug information in STABS format
|
|
|
|
gstabs+
|
|
Common JoinedOrMissing Negative(gvms)
|
|
Generate debug information in extended STABS format
|
|
|
|
gvms
|
|
Common JoinedOrMissing Negative(gxcoff)
|
|
Generate debug information in VMS format
|
|
|
|
gxcoff
|
|
Common JoinedOrMissing Negative(gxcoff+)
|
|
Generate debug information in XCOFF format
|
|
|
|
gxcoff+
|
|
Common JoinedOrMissing Negative(gcoff)
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Generate debug information in extended XCOFF format
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o
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Common Joined Separate
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-o <file> Place output into <file>
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p
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Common Var(profile_flag)
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Enable function profiling
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pedantic
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Common Var(pedantic)
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Issue warnings needed for strict compliance to the standard
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pedantic-errors
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Common
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Like -pedantic but issue them as errors
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quiet
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Common Var(quiet_flag)
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Do not display functions compiled or elapsed time
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version
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Common Var(version_flag)
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Display the compiler's version
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w
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Common Var(inhibit_warnings)
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Suppress warnings
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; This comment is to ensure we retain the blank line above.
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