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|
# Copyright 1999-2007 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# $Header: /var/cvsroot/gentoo-x86/eclass/flag-o-matic.eclass,v 1.117 2007/03/04 21:13:17 vapier Exp $
#
# Maintainer: toolchain@gentoo.org
# need access to emktemp()
inherit eutils toolchain-funcs multilib
#
#### filter-flags <flags> ####
# Remove particular flags from C[XX]FLAGS
# Matches only complete flags
#
#### append-flags <flags> ####
# Add extra flags to your current C[XX]FLAGS
#
#### replace-flags <orig.flag> <new.flag> ###
# Replace a flag by another one
#
#### replace-cpu-flags <old.cpus> <new.cpu> ###
# Replace march/mcpu flags that specify <old.cpus>
# with flags that specify <new.cpu>
#
#### is-flag[q] <flag> ####
# Returns "true" if flag is set in C[XX]FLAGS
# Matches only complete a flag
# q version sets return code but doesn't echo
#
#### is-ldflag[q] <flag> ####
# Returns "true" if flag is set in LDFLAGS
# Matches only complete a flag
# q version sets return code but doesn't echo
#
#### strip-flags ####
# Strip C[XX]FLAGS of everything except known
# good options.
#
#### strip-unsupported-flags ####
# Strip C[XX]FLAGS of any flags not supported by
# installed version of gcc
#
#### get-flag <flag> ####
# Find and echo the value for a particular flag
#
#### replace-sparc64-flags ####
# Sets mcpu to v8 and uses the original value
# as mtune if none specified.
#
#### filter-mfpmath <math types> ####
# Remove specified math types from the fpmath specification
# If the user has -mfpmath=sse,386, running `filter-mfpmath sse`
# will leave the user with -mfpmath=386
#
#### append-ldflags ####
# Add extra flags to your current LDFLAGS
#
#### filter-ldflags <flags> ####
# Remove particular flags from LDFLAGS
# Matches only complete flags
#
#### bindnow-flags ####
# Returns the flags to enable "now" binding in the current selected linker.
#
################ DEPRECATED functions ################
# The following are still present to avoid breaking existing
# code more than necessary; however they are deprecated. Please
# use gcc-specs-* from toolchain-funcs.eclass instead, if you
# need to know which hardened techs are active in the compiler.
# See bug #100974
#
#### has_hardened ####
# Returns true if the compiler has 'Hardened' in its version string,
# (note; switched-spec vanilla compilers satisfy this condition) or
# the specs file name contains 'hardened'.
#
#### has_pie ####
# Returns true if the compiler by default or with current CFLAGS
# builds position-independent code.
#
#### has_pic ####
# Returns true if the compiler by default or with current CFLAGS
# builds position-independent code.
#
#### has_ssp_all ####
# Returns true if the compiler by default or with current CFLAGS
# generates stack smash protections for all functions
#
#### has_ssp ####
# Returns true if the compiler by default or with current CFLAGS
# generates stack smash protections for most vulnerable functions
#
# C[XX]FLAGS that we allow in strip-flags
# Note: shell globs and character lists are allowed
setup-allowed-flags() {
if [[ -z ${ALLOWED_FLAGS} ]] ; then
export ALLOWED_FLAGS="-pipe"
export ALLOWED_FLAGS="${ALLOWED_FLAGS} -O -O0 -O1 -O2 -mcpu -march -mtune"
export ALLOWED_FLAGS="${ALLOWED_FLAGS} -fstack-protector -fstack-protector-all"
export ALLOWED_FLAGS="${ALLOWED_FLAGS} -fbounds-checking -fno-bounds-checking"
export ALLOWED_FLAGS="${ALLOWED_FLAGS} -fno-PIE -fno-pie -fno-unit-at-a-time"
export ALLOWED_FLAGS="${ALLOWED_FLAGS} -g -g[0-9] -ggdb -ggdb[0-9] -gstabs -gstabs+"
export ALLOWED_FLAGS="${ALLOWED_FLAGS} -fno-ident"
fi
# allow a bunch of flags that negate features / control ABI
ALLOWED_FLAGS="${ALLOWED_FLAGS} -fno-stack-protector -fno-stack-protector-all"
ALLOWED_FLAGS="${ALLOWED_FLAGS} -mregparm -mno-app-regs -mapp-regs \
-mno-mmx -mno-sse -mno-sse2 -mno-sse3 -mno-3dnow \
-mips1 -mips2 -mips3 -mips4 -mips32 -mips64 -mips16 \
-msoft-float -mno-soft-float -mhard-float -mno-hard-float -mfpu \
-mieee -mieee-with-inexact -mschedule \
-mtls-direct-seg-refs -mno-tls-direct-seg-refs \
-mflat -mno-flat -mno-faster-structs -mfaster-structs \
-m32 -m64 -mabi -mlittle-endian -mbig-endian -EL -EB -fPIC \
-mlive-g0 -mcmodel -mstack-bias -mno-stack-bias \
-msecure-plt -D*"
# C[XX]FLAGS that we are think is ok, but needs testing
# NOTE: currently -Os have issues with gcc3 and K6* arch's
export UNSTABLE_FLAGS="-Os -O3 -freorder-blocks"
return 0
}
# inverted filters for hardened compiler. This is trying to unpick
# the hardened compiler defaults.
_filter-hardened() {
local f
for f in "$@" ; do
case "${f}" in
# Ideally we should only concern ourselves with PIE flags,
# not -fPIC or -fpic, but too many places filter -fPIC without
# thinking about -fPIE.
-fPIC|-fpic|-fPIE|-fpie|-Wl,pie|-pie)
gcc-specs-pie || continue
is-flagq -nopie || append-flags -nopie;;
-fstack-protector)
gcc-specs-ssp || continue
is-flagq -fno-stack-protector || append-flags -fno-stack-protector;;
-fstack-protector-all)
gcc-specs-ssp-to-all || continue
is-flagq -fno-stack-protector-all || append-flags -fno-stack-protector-all;;
esac
done
}
# Remove occurrences of strings from variable given in $1
# Strings removed are matched as globs, so for example
# '-O*' would remove -O1, -O2 etc.
_filter-var() {
local f x VAR VAL
declare -a new
VAR=$1
shift
eval VAL=\${${VAR}}
for f in ${VAL}; do
for x in "$@"; do
# Note this should work with globs like -O*
[[ ${f} == ${x} ]] && continue 2
done
eval new\[\${\#new\[@]}]=\${f}
done
eval export ${VAR}=\${new\[*]}
}
filter-flags() {
_filter-hardened "$@"
_filter-var CFLAGS "$@"
_filter-var CXXFLAGS "$@"
return 0
}
filter-lfs-flags() {
[[ -n $@ ]] && die "filter-lfs-flags takes no arguments"
filter-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
}
append-lfs-flags() {
[[ -n $@ ]] && die "append-lfs-flags takes no arguments"
append-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
}
append-flags() {
[[ -z $* ]] && return 0
export CFLAGS="${CFLAGS} $*"
export CXXFLAGS="${CXXFLAGS} $*"
return 0
}
replace-flags() {
[[ $# != 2 ]] \
&& echo && eerror "Usage: replace-flags <old flag> <new flag>" \
&& die "replace-flags takes 2 arguments, not $#"
local f fset
declare -a new_CFLAGS new_CXXFLAGS
for fset in CFLAGS CXXFLAGS; do
# Looping over the flags instead of using a global
# substitution ensures that we're working with flag atoms.
# Otherwise globs like -O* have the potential to wipe out the
# list of flags.
for f in ${!fset}; do
# Note this should work with globs like -O*
[[ ${f} == ${1} ]] && f=${2}
eval new_${fset}\[\${\#new_${fset}\[@]}]=\${f}
done
eval export ${fset}=\${new_${fset}\[*]}
done
return 0
}
replace-cpu-flags() {
local newcpu="$#" ; newcpu="${!newcpu}"
while [ $# -gt 1 ] ; do
# quote to make sure that no globbing is done (particularly on
# ${oldcpu}) prior to calling replace-flags
replace-flags "-march=${1}" "-march=${newcpu}"
replace-flags "-mcpu=${1}" "-mcpu=${newcpu}"
replace-flags "-mtune=${1}" "-mtune=${newcpu}"
shift
done
return 0
}
_is_flagq() {
local x
for x in ${!1} ; do
[[ ${x} == $2 ]] && return 0
done
return 1
}
is-flagq() {
[[ -n $2 ]] && die "Usage: is-flag <flag>"
_is_flagq CFLAGS $1 || _is_flagq CXXFLAGS $1
}
is-flag() {
is-flagq "$@" && echo true
}
is-ldflagq() {
[[ -n $2 ]] && die "Usage: is-ldflag <flag>"
_is_flagq LDFLAGS $1
}
is-ldflag() {
is-ldflagq "$@" && echo true
}
filter-mfpmath() {
local orig_mfpmath new_math prune_math
# save the original -mfpmath flag
orig_mfpmath=$(get-flag -mfpmath)
# get the value of the current -mfpmath flag
new_math=$(get-flag mfpmath)
new_math=" ${new_math//,/ } "
# figure out which math values are to be removed
prune_math=""
for prune_math in "$@" ; do
new_math=${new_math/ ${prune_math} / }
done
new_math=$(echo ${new_math})
new_math=${new_math// /,}
if [[ -z ${new_math} ]] ; then
# if we're removing all user specified math values are
# slated for removal, then we just filter the flag
filter-flags ${orig_mfpmath}
else
# if we only want to filter some of the user specified
# math values, then we replace the current flag
replace-flags ${orig_mfpmath} -mfpmath=${new_math}
fi
return 0
}
strip-flags() {
local x y flag NEW_CFLAGS NEW_CXXFLAGS
setup-allowed-flags
local NEW_CFLAGS=""
local NEW_CXXFLAGS=""
# Allow unstable C[XX]FLAGS if we are using unstable profile ...
if has ~$(tc-arch) ${ACCEPT_KEYWORDS} ; then
ALLOWED_FLAGS="${ALLOWED_FLAGS} ${UNSTABLE_FLAGS}"
fi
set -f # disable pathname expansion
for x in ${CFLAGS}; do
for y in ${ALLOWED_FLAGS}; do
flag=${x%%=*}
if [ "${flag%%${y}}" = "" ] ; then
NEW_CFLAGS="${NEW_CFLAGS} ${x}"
break
fi
done
done
for x in ${CXXFLAGS}; do
for y in ${ALLOWED_FLAGS}; do
flag=${x%%=*}
if [ "${flag%%${y}}" = "" ] ; then
NEW_CXXFLAGS="${NEW_CXXFLAGS} ${x}"
break
fi
done
done
# In case we filtered out all optimization flags fallback to -O2
if [ "${CFLAGS/-O}" != "${CFLAGS}" -a "${NEW_CFLAGS/-O}" = "${NEW_CFLAGS}" ]; then
NEW_CFLAGS="${NEW_CFLAGS} -O2"
fi
if [ "${CXXFLAGS/-O}" != "${CXXFLAGS}" -a "${NEW_CXXFLAGS/-O}" = "${NEW_CXXFLAGS}" ]; then
NEW_CXXFLAGS="${NEW_CXXFLAGS} -O2"
fi
set +f # re-enable pathname expansion
export CFLAGS="${NEW_CFLAGS}"
export CXXFLAGS="${NEW_CXXFLAGS}"
return 0
}
test-flag-PROG() {
local comp=$1
local flags="$2"
[[ -z ${comp} || -z ${flags} ]] && \
return 1
local PROG=$(tc-get${comp})
${PROG} ${flags} -S -o /dev/null -xc /dev/null \
> /dev/null 2>&1
}
# Returns true if C compiler support given flag
test-flag-CC() { test-flag-PROG "CC" "$1"; }
# Returns true if C++ compiler support given flag
test-flag-CXX() { test-flag-PROG "CXX" "$1"; }
test-flags-PROG() {
local comp=$1
local flags
local x
shift
[[ -z ${comp} ]] && return 1
x=""
for x in "$@" ; do
test-flag-${comp} "${x}" && flags="${flags}${flags:+ }${x}"
done
echo "${flags}"
# Just bail if we dont have any flags
[[ -n ${flags} ]]
}
# Returns (echo's) the given flags supported by the C compiler
test-flags-CC() { test-flags-PROG "CC" "$@"; }
# Returns (echo's) the given flags supported by the C++ compiler
test-flags-CXX() { test-flags-PROG "CXX" "$@"; }
# Short-hand that should hopefully work for both C and C++ compiler, but
# its really only present due to the append-flags() abomination.
test-flags() { test-flags-CC "$@"; }
# Depriciated, use test-flags()
test_flag() {
ewarn "test_flag: deprecated, please use test-flags()!" >&2
test-flags-CC "$@"
}
test_version_info() {
if [[ $($(tc-getCC) --version 2>&1) == *$1* ]]; then
return 0
else
return 1
fi
}
strip-unsupported-flags() {
export CFLAGS=$(test-flags-CC ${CFLAGS})
export CXXFLAGS=$(test-flags-CXX ${CXXFLAGS})
}
get-flag() {
local f findflag="$1"
# this code looks a little flaky but seems to work for
# everything we want ...
# for example, if CFLAGS="-march=i686":
# `get-flag -march` == "-march=i686"
# `get-flag march` == "i686"
for f in ${CFLAGS} ${CXXFLAGS} ; do
if [ "${f/${findflag}}" != "${f}" ] ; then
printf "%s\n" "${f/-${findflag}=}"
return 0
fi
done
return 1
}
# DEPRECATED - use gcc-specs-relro or gcc-specs-now from toolchain-funcs
has_hardened() {
ewarn "has_hardened: deprecated, please use gcc-specs-{relro,now}()!" >&2
test_version_info Hardened && return 0
# The specs file wont exist unless gcc has GCC_SPECS support
[[ -f ${GCC_SPECS} && ${GCC_SPECS} != ${GCC_SPECS/hardened/} ]]
}
# DEPRECATED - use gcc-specs-pie from toolchain-funcs
# indicate whether PIC is set
has_pic() {
ewarn "has_pic: deprecated, please use gcc-specs-pie()!" >&2
[[ ${CFLAGS/-fPIC} != ${CFLAGS} || \
${CFLAGS/-fpic} != ${CFLAGS} ]] || \
gcc-specs-pie
}
# DEPRECATED - use gcc-specs-pie from toolchain-funcs
# indicate whether PIE is set
has_pie() {
ewarn "has_pie: deprecated, please use gcc-specs-pie()!" >&2
[[ ${CFLAGS/-fPIE} != ${CFLAGS} || \
${CFLAGS/-fpie} != ${CFLAGS} ]] || \
gcc-specs-pie
}
# DEPRECATED - use gcc-specs-ssp from toolchain-funcs
# indicate whether code for SSP is being generated for all functions
has_ssp_all() {
ewarn "has_ssp_all: deprecated, please use gcc-specs-ssp()!" >&2
# note; this matches only -fstack-protector-all
[[ ${CFLAGS/-fstack-protector-all} != ${CFLAGS} || \
-n $(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __SSP_ALL__) ]] || \
gcc-specs-ssp-all
}
# DEPRECATED - use gcc-specs-ssp from toolchain-funcs
# indicate whether code for SSP is being generated
has_ssp() {
ewarn "has_ssp: deprecated, please use gcc-specs-ssp()!" >&2
# note; this matches both -fstack-protector and -fstack-protector-all
[[ ${CFLAGS/-fstack-protector} != ${CFLAGS} || \
-n $(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __SSP__) ]] || \
gcc-specs-ssp
}
has_m64() {
# this doesnt test if the flag is accepted, it tests if the flag
# actually -WORKS-. non-multilib gcc will take both -m32 and -m64!
# please dont replace this function with test_flag in some future
# clean-up!
local temp="$(emktemp)"
echo "int main() { return(0); }" > "${temp}".c
MY_CC=$(tc-getCC)
${MY_CC/ .*/} -m64 -o "$(emktemp)" "${temp}".c > /dev/null 2>&1
local ret=$?
rm -f "${temp}".c
[[ ${ret} != 1 ]] && return 0
return 1
}
has_m32() {
# this doesnt test if the flag is accepted, it tests if the flag
# actually -WORKS-. non-multilib gcc will take both -m32 and -m64!
# please dont replace this function with test_flag in some future
# clean-up!
[ "$(tc-arch)" = "amd64" ] && has_multilib_profile && return 0
local temp=$(emktemp)
echo "int main() { return(0); }" > "${temp}".c
MY_CC=$(tc-getCC)
${MY_CC/ .*/} -m32 -o "$(emktemp)" "${temp}".c > /dev/null 2>&1
local ret=$?
rm -f "${temp}".c
[[ ${ret} != 1 ]] && return 0
return 1
}
replace-sparc64-flags() {
local SPARC64_CPUS="ultrasparc3 ultrasparc v9"
if [ "${CFLAGS/mtune}" != "${CFLAGS}" ]; then
for x in ${SPARC64_CPUS}; do
CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8}"
done
else
for x in ${SPARC64_CPUS}; do
CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
done
fi
if [ "${CXXFLAGS/mtune}" != "${CXXFLAGS}" ]; then
for x in ${SPARC64_CPUS}; do
CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8}"
done
else
for x in ${SPARC64_CPUS}; do
CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
done
fi
export CFLAGS CXXFLAGS
}
append-ldflags() {
[[ -z $* ]] && return 0
export LDFLAGS="${LDFLAGS} $*"
return 0
}
# Remove flags from LDFLAGS - it's up to the ebuild to filter
# CFLAGS and CXXFLAGS via filter-flags if they need to.
filter-ldflags() {
_filter-var LDFLAGS "$@"
return 0
}
# Turn C style ldflags (-Wl,-foo) into straight ldflags - the results
# are suitable for passing directly to 'ld'; note LDFLAGS is usually passed
# to gcc where it needs the '-Wl,'.
raw-ldflags() {
local x input="$@"
[[ -z ${input} ]] && input=${LDFLAGS}
set --
for x in ${input} ; do
x=${x#-Wl,}
set -- "$@" ${x//,/ }
done
echo "$@"
}
# Gets the flags needed for "NOW" binding
bindnow-flags() {
case $($(tc-getLD) -v 2>&1 </dev/null) in
*GNU* | *'with BFD'*) # GNU ld
echo "-Wl,-z,now" ;;
*Apple*) # Darwin ld
echo "-bind_at_load" ;;
*)
# Some linkers just recognize -V instead of -v
case $($(tc-getLD) -V 2>&1 </dev/null) in
*Solaris*) # Solaris accept almost the same GNU options
echo "-Wl,-z,now" ;;
esac
;;
esac
}
# Some tests for when we screw with things and want to make
# sure we didn't break anything
#TESTS() {
# CFLAGS="-a -b -c=1"
# CXXFLAGS="-x -y -z=2"
# LDFLAGS="-l -m -n=3"
#
# die() { exit 1; }
# (is-flag 1 2 3) && die
# (is-ldflag 1 2 3) && die
#
# is-flagq -l && die
# is-ldflagq -a && die
# is-flagq -a || die
# is-flagq -x || die
# is-ldflagq -n=* || die
# is-ldflagq -n && die
#
# strip-unsupported-flags
# [[ ${CFLAGS} == "-c=1" ]] || die
# [[ ${CXXFLAGS} == "-y -z=2" ]] || die
#
# echo "All tests pass"
#}
#TESTS
|