# Copyright 1999-2005 Gentoo Foundation # Distributed under the terms of the GNU General Public License v2 # $Header: /var/cvsroot/gentoo-x86/eclass/flag-o-matic.eclass,v 1.90 2005/07/11 19:28:20 agriffis Exp $ # 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 <flag> #### # Returns "true" if flag is set in C[XX]FLAGS # Matches only complete a flag # #### 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 # #### fstack-flags #### # hooked function for hardened gcc that appends # -fno-stack-protector to {C,CXX,LD}FLAGS # when a package is filtering -fstack-protector, -fstack-protector-all # notice: modern automatic specs files will also suppress -fstack-protector-all # when only -fno-stack-protector is given # #### 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 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="${ALLOWED_FLAGS} -fno-pie -fno-unit-at-a-time" export ALLOWED_FLAGS="${ALLOWED_FLAGS} -g -g0 -g1 -g2 -g3 -ggdb -ggdb0 -ggdb1 -ggdb2 -ggdb3" 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 \ -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" # 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 -fprefetch-loop-arrays" return 0 } filter-flags() { local x f fset declare -a new_CFLAGS new_CXXFLAGS for x in "$@" ; do case "${x}" in -fPIC|-fpic|-fPIE|-fpie|-pie) append-flags `test_flag -fno-pie`;; -fstack-protector|-fstack-protector-all) fstack-flags;; esac done 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 ${!fset}; do for x in "$@"; do # Note this should work with globs like -O* [[ ${f} == ${x} ]] && continue 2 done eval new_${fset}\[\${\#new_${fset}\[@]}]=\${f} done eval export ${fset}=\${new_${fset}\[*]} done return 0 } filter-lfs-flags() { filter-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE } append-lfs-flags() { append-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE } append-flags() { [[ -z $* ]] && return 0 export CFLAGS="${CFLAGS} $*" export CXXFLAGS="${CXXFLAGS} $*" [ -n "`is-flag -fno-stack-protector`" -o \ -n "`is-flag -fno-stack-protector-all`" ] && fstack-flags return 0 } replace-flags() { 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-flag() { local x for x in ${CFLAGS} ${CXXFLAGS} ; do # Note this should work with globs like -mcpu=ultrasparc* if [[ ${x} == ${1} ]]; then echo true return 0 fi done return 1 } filter-mfpmath() { local orig_mfpmath new_math prune_math # save the original -mfpmath flag orig_mfpmath="`get-flag -mfpmath`" # get the value of the current -mfpmath flag new_math=" `get-flag mfpmath | tr , ' '` " # figure out which math values are to be removed prune_math="" for prune_math in "$@" ; do new_math="${new_math/ ${prune_math} / }" done new_math="`echo ${new_math:1:${#new_math}-2} | tr ' ' ,`" 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() { if $(tc-getCC) -S -xc "$@" -o "$(emktemp)" /dev/null &>/dev/null; then printf "%s\n" "$*" return 0 fi return 1 } test_version_info() { if [[ $($(tc-getCC) --version 2>&1) == *$1* ]]; then return 0 else return 1 fi } strip-unsupported-flags() { local NEW_CFLAGS NEW_CXXFLAGS for x in ${CFLAGS} ; do NEW_CFLAGS="${NEW_CFLAGS} `test_flag ${x}`" done for x in ${CXXFLAGS} ; do NEW_CXXFLAGS="${NEW_CXXFLAGS} `test_flag ${x}`" done export CFLAGS="${NEW_CFLAGS}" export CXXFLAGS="${NEW_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 } has_hardened() { test_version_info Hardened && return 0 # the specs file wont exist unless gcc has GCC_SPECS support [ -f "${GCC_SPECS}" -a "${GCC_SPECS}" != "${GCC_SPECS/hardened/}" ] && \ return 0 return 1 } # indicate whether PIC is set has_pic() { [ "${CFLAGS/-fPIC}" != "${CFLAGS}" ] && return 0 [ "${CFLAGS/-fpic}" != "${CFLAGS}" ] && return 0 [ "$(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __PIC__)" ] && return 0 return 1 } # indicate whether PIE is set has_pie() { [ "${CFLAGS/-fPIE}" != "${CFLAGS}" ] && return 0 [ "${CFLAGS/-fpie}" != "${CFLAGS}" ] && return 0 [ "$(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __PIE__)" ] && return 0 # test PIC while waiting for specs to be updated to generate __PIE__ [ "$(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __PIC__)" ] && return 0 return 1 } # indicate whether code for SSP is being generated for all functions has_ssp_all() { # note; this matches only -fstack-protector-all [ "${CFLAGS/-fstack-protector-all}" != "${CFLAGS}" ] && return 0 [ "$(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __SSP_ALL__)" ] && return 0 return 1 } # indicate whether code for SSP is being generated has_ssp() { # note; this matches both -fstack-protector and -fstack-protector-all [ "${CFLAGS/-fstack-protector}" != "${CFLAGS}" ] && return 0 [ "$(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __SSP__)" ] && return 0 return 1 } has_m64() { # this doesnt test if the flag is accepted, it tests if the flag # actually -WORKS-. non-multilib gcc will take both -m32 and -m64! # please dont replace this function with test_flag in some future # clean-up! local temp="$(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="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() { export LDFLAGS="${LDFLAGS} $*" return 0 } filter-ldflags() { local x # we do this fancy spacing stuff so as to not filter # out part of a flag ... we want flag atoms ! :D LDFLAGS=" ${LDFLAGS} " for x in "$@" ; do LDFLAGS=${LDFLAGS// ${x} / } done [[ -z ${LDFLAGS// } ]] \ && LDFLAGS="" \ || LDFLAGS=${LDFLAGS:1:${#LDFLAGS}-2} export LDFLAGS return 0 } fstack-flags() { if has_ssp; then [ -z "`is-flag -fno-stack-protector`" ] && export CFLAGS="${CFLAGS} `test_flag -fno-stack-protector`" fi return 0 } # This is thanks to great work from Paul de Vrieze <gentoo-user@devrieze.net>, # bug #9016. Also thanks to Jukka Salmi <salmi@gmx.net> (bug #13907) for more # fixes. # # Export CFLAGS and CXXFLAGS that are compadible with gcc-2.95.3 gcc2-flags() { if [[ $(tc-arch) == "x86" || $(tc-arch) == "amd64" ]] ; then CFLAGS=${CFLAGS//-mtune=/-mcpu=} CXXFLAGS=${CXXFLAGS//-mtune=/-mcpu=} fi replace-cpu-flags k6-{2,3} k6 replace-cpu-flags athlon{,-{tbird,4,xp,mp}} i686 replace-cpu-flags pentium-mmx i586 replace-cpu-flags pentium{2,3,4} i686 replace-cpu-flags ev6{7,8} ev6 export CFLAGS CXXFLAGS }