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# Copyright 1999-2005 Gentoo Foundation |
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# Distributed under the terms of the GNU General Public License v2 |
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# $Header: /var/cvsroot/gentoo-x86/eclass/flag-o-matic.eclass,v 1.97 2005/12/08 21:08:48 azarah Exp $ |
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|
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|
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# need access to emktemp() |
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inherit eutils toolchain-funcs multilib |
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|
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# |
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#### filter-flags <flags> #### |
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# Remove particular flags from C[XX]FLAGS |
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# Matches only complete flags |
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# |
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#### append-flags <flags> #### |
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# Add extra flags to your current C[XX]FLAGS |
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# |
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#### replace-flags <orig.flag> <new.flag> ### |
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# Replace a flag by another one |
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# |
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#### replace-cpu-flags <old.cpus> <new.cpu> ### |
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# Replace march/mcpu flags that specify <old.cpus> |
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# with flags that specify <new.cpu> |
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# |
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#### is-flag <flag> #### |
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# Returns "true" if flag is set in C[XX]FLAGS |
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# Matches only complete a flag |
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# |
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#### strip-flags #### |
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# Strip C[XX]FLAGS of everything except known |
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# good options. |
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# |
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#### strip-unsupported-flags #### |
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# Strip C[XX]FLAGS of any flags not supported by |
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# installed version of gcc |
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# |
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#### get-flag <flag> #### |
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# Find and echo the value for a particular flag |
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# |
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#### replace-sparc64-flags #### |
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# Sets mcpu to v8 and uses the original value |
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# as mtune if none specified. |
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# |
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#### filter-mfpmath <math types> #### |
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# Remove specified math types from the fpmath specification |
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# If the user has -mfpmath=sse,386, running `filter-mfpmath sse` |
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# will leave the user with -mfpmath=386 |
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# |
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#### append-ldflags #### |
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# Add extra flags to your current LDFLAGS |
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# |
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#### filter-ldflags <flags> #### |
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# Remove particular flags from LDFLAGS |
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# Matches only complete flags |
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# |
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#### fstack-flags #### |
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# hooked function for hardened gcc that appends |
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# -fno-stack-protector to {C,CXX,LD}FLAGS |
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# when a package is filtering -fstack-protector, -fstack-protector-all |
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# notice: modern automatic specs files will also suppress -fstack-protector-all |
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# when only -fno-stack-protector is given |
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# |
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#### bindnow-flags #### |
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# Returns the flags to enable "now" binding in the current selected linker. |
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# |
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################ DEPRECATED functions ################ |
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# The following are still present to avoid breaking existing |
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# code more than necessary; however they are deprecated. Please |
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# use gcc-specs-* from toolchain-funcs.eclass instead, if you |
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# need to know which hardened techs are active in the compiler. |
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# See bug #100974 |
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# |
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#### has_hardened #### |
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# Returns true if the compiler has 'Hardened' in its version string, |
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# (note; switched-spec vanilla compilers satisfy this condition) or |
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# the specs file name contains 'hardened'. |
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# |
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#### has_pie #### |
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# Returns true if the compiler by default or with current CFLAGS |
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# builds position-independent code. |
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# |
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#### has_pic #### |
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# Returns true if the compiler by default or with current CFLAGS |
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# builds position-independent code. |
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# |
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#### has_ssp_all #### |
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# Returns true if the compiler by default or with current CFLAGS |
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# generates stack smash protections for all functions |
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# |
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#### has_ssp #### |
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# Returns true if the compiler by default or with current CFLAGS |
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# generates stack smash protections for most vulnerable functions |
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# |
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|
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# C[XX]FLAGS that we allow in strip-flags |
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setup-allowed-flags() { |
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if [[ -z ${ALLOWED_FLAGS} ]] ; then |
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export ALLOWED_FLAGS="-pipe" |
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export ALLOWED_FLAGS="${ALLOWED_FLAGS} -O -O0 -O1 -O2 -mcpu -march -mtune" |
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export ALLOWED_FLAGS="${ALLOWED_FLAGS} -fstack-protector -fstack-protector-all" |
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export ALLOWED_FLAGS="${ALLOWED_FLAGS} -fbounds-checking -fno-bounds-checking" |
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export ALLOWED_FLAGS="${ALLOWED_FLAGS} -fno-pie -fno-unit-at-a-time" |
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export ALLOWED_FLAGS="${ALLOWED_FLAGS} -g -g0 -g1 -g2 -g3 -ggdb -ggdb0 -ggdb1 -ggdb2 -ggdb3" |
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fi |
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# allow a bunch of flags that negate features / control ABI |
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ALLOWED_FLAGS="${ALLOWED_FLAGS} -fno-stack-protector -fno-stack-protector-all" |
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ALLOWED_FLAGS="${ALLOWED_FLAGS} -mregparm -mno-app-regs -mapp-regs \ |
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-mno-mmx -mno-sse -mno-sse2 -mno-sse3 -mno-3dnow \ |
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-mips1 -mips2 -mips3 -mips4 -mips32 -mips64 -mips16 \ |
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-msoft-float -mno-soft-float -mhard-float -mno-hard-float -mfpu \ |
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-mieee -mieee-with-inexact \ |
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-mtls-direct-seg-refs -mno-tls-direct-seg-refs \ |
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-mflat -mno-flat -mno-faster-structs -mfaster-structs \ |
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-m32 -m64 -mabi -mlittle-endian -mbig-endian -EL -EB -fPIC \ |
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-mlive-g0 -mcmodel -mstack-bias -mno-stack-bias" |
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|
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# C[XX]FLAGS that we are think is ok, but needs testing |
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# NOTE: currently -Os have issues with gcc3 and K6* arch's |
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export UNSTABLE_FLAGS="-Os -O3 -freorder-blocks -fprefetch-loop-arrays" |
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return 0 |
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} |
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|
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filter-flags() { |
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local x f fset |
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declare -a new_CFLAGS new_CXXFLAGS |
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|
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for x in "$@" ; do |
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case "${x}" in |
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-fPIC|-fpic|-fPIE|-fpie|-pie) |
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append-flags `test_flag -fno-pie`;; |
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-fstack-protector|-fstack-protector-all) |
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fstack-flags;; |
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esac |
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done |
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|
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for fset in CFLAGS CXXFLAGS; do |
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# Looping over the flags instead of using a global |
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# substitution ensures that we're working with flag atoms. |
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# Otherwise globs like -O* have the potential to wipe out the |
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# list of flags. |
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for f in ${!fset}; do |
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for x in "$@"; do |
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# Note this should work with globs like -O* |
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[[ ${f} == ${x} ]] && continue 2 |
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done |
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eval new_${fset}\[\${\#new_${fset}\[@]}]=\${f} |
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done |
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eval export ${fset}=\${new_${fset}\[*]} |
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done |
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|
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return 0 |
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} |
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|
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filter-lfs-flags() { |
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[[ -n $@ ]] && die "filter-lfs-flags takes no arguments" |
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filter-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE |
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} |
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|
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append-lfs-flags() { |
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[[ -n $@ ]] && die "append-lfs-flags takes no arguments" |
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append-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE |
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} |
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|
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append-flags() { |
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[[ -z $* ]] && return 0 |
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export CFLAGS="${CFLAGS} $*" |
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export CXXFLAGS="${CXXFLAGS} $*" |
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[ -n "`is-flag -fno-stack-protector`" -o \ |
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-n "`is-flag -fno-stack-protector-all`" ] && fstack-flags |
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return 0 |
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} |
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|
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replace-flags() { |
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[[ $# != 2 ]] \ |
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&& echo && eerror "Usage: replace-flags <old flag> <new flag>" \ |
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&& die "replace-flags takes 2 arguments, not $#" |
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|
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local f fset |
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declare -a new_CFLAGS new_CXXFLAGS |
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|
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for fset in CFLAGS CXXFLAGS; do |
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# Looping over the flags instead of using a global |
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# substitution ensures that we're working with flag atoms. |
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# Otherwise globs like -O* have the potential to wipe out the |
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# list of flags. |
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for f in ${!fset}; do |
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# Note this should work with globs like -O* |
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[[ ${f} == ${1} ]] && f=${2} |
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eval new_${fset}\[\${\#new_${fset}\[@]}]=\${f} |
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done |
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eval export ${fset}=\${new_${fset}\[*]} |
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done |
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|
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return 0 |
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} |
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|
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replace-cpu-flags() { |
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local newcpu="$#" ; newcpu="${!newcpu}" |
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while [ $# -gt 1 ] ; do |
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# quote to make sure that no globbing is done (particularly on |
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# ${oldcpu} prior to calling replace-flags |
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replace-flags "-march=${1}" "-march=${newcpu}" |
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replace-flags "-mcpu=${1}" "-mcpu=${newcpu}" |
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replace-flags "-mtune=${1}" "-mtune=${newcpu}" |
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shift |
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done |
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return 0 |
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} |
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|
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is-flag() { |
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local x |
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|
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for x in ${CFLAGS} ${CXXFLAGS} ; do |
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# Note this should work with globs like -mcpu=ultrasparc* |
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if [[ ${x} == ${1} ]]; then |
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echo true |
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return 0 |
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fi |
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done |
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return 1 |
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} |
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|
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filter-mfpmath() { |
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local orig_mfpmath new_math prune_math |
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|
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# save the original -mfpmath flag |
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orig_mfpmath="`get-flag -mfpmath`" |
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# get the value of the current -mfpmath flag |
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new_math=" `get-flag mfpmath | tr , ' '` " |
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# figure out which math values are to be removed |
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prune_math="" |
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for prune_math in "$@" ; do |
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new_math="${new_math/ ${prune_math} / }" |
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done |
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new_math="`echo ${new_math:1:${#new_math}-2} | tr ' ' ,`" |
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|
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if [ -z "${new_math}" ] ; then |
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# if we're removing all user specified math values are |
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# slated for removal, then we just filter the flag |
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filter-flags ${orig_mfpmath} |
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else |
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# if we only want to filter some of the user specified |
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# math values, then we replace the current flag |
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replace-flags ${orig_mfpmath} -mfpmath=${new_math} |
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fi |
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return 0 |
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} |
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|
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strip-flags() { |
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local x y flag NEW_CFLAGS NEW_CXXFLAGS |
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|
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setup-allowed-flags |
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|
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local NEW_CFLAGS="" |
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local NEW_CXXFLAGS="" |
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|
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# Allow unstable C[XX]FLAGS if we are using unstable profile ... |
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if has ~$(tc-arch) ${ACCEPT_KEYWORDS} ; then |
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ALLOWED_FLAGS="${ALLOWED_FLAGS} ${UNSTABLE_FLAGS}" |
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fi |
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|
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set -f # disable pathname expansion |
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|
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for x in ${CFLAGS}; do |
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for y in ${ALLOWED_FLAGS}; do |
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flag=${x%%=*} |
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if [ "${flag%%${y}}" = "" ] ; then |
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NEW_CFLAGS="${NEW_CFLAGS} ${x}" |
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break |
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fi |
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done |
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done |
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|
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for x in ${CXXFLAGS}; do |
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for y in ${ALLOWED_FLAGS}; do |
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flag=${x%%=*} |
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if [ "${flag%%${y}}" = "" ] ; then |
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NEW_CXXFLAGS="${NEW_CXXFLAGS} ${x}" |
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break |
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fi |
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done |
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done |
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|
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# In case we filtered out all optimization flags fallback to -O2 |
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if [ "${CFLAGS/-O}" != "${CFLAGS}" -a "${NEW_CFLAGS/-O}" = "${NEW_CFLAGS}" ]; then |
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NEW_CFLAGS="${NEW_CFLAGS} -O2" |
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fi |
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if [ "${CXXFLAGS/-O}" != "${CXXFLAGS}" -a "${NEW_CXXFLAGS/-O}" = "${NEW_CXXFLAGS}" ]; then |
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NEW_CXXFLAGS="${NEW_CXXFLAGS} -O2" |
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fi |
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|
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set +f # re-enable pathname expansion |
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|
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export CFLAGS="${NEW_CFLAGS}" |
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export CXXFLAGS="${NEW_CXXFLAGS}" |
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return 0 |
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} |
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|
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test-flag-PROG() { |
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local comp=$1 |
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local flags="$2" |
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|
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[[ -z ${comp} || -z ${flags} ]] && \ |
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return 1 |
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|
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local PROG=$(tc-get${comp}) |
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${PROG} ${flags} -S -o /dev/null -xc /dev/null \ |
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> /dev/null 2>&1 |
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} |
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|
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# Returns true if C compiler support given flag |
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test-flag-CC() { test-flag-PROG "CC" "$1"; } |
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|
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# Returns true if C++ compiler support given flag |
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test-flag-CXX() { test-flag-PROG "CXX" "$1"; } |
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|
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test-flags() { |
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local x |
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|
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for x in "$@" ; do |
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test-flag-CC "${x}" || return 1 |
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done |
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|
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echo "$@" |
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|
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return 0 |
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} |
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|
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# Depriciated, use test-flags() |
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test_flag() { |
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addwrite "/dev/stderr" |
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ewarn "test_flag: deprecated, please use test-flags()!" >/dev/stderr |
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|
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test-flags "$@" |
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} |
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|
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test_version_info() { |
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if [[ $($(tc-getCC) --version 2>&1) == *$1* ]]; then |
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return 0 |
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else |
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return 1 |
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fi |
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} |
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|
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strip-unsupported-flags() { |
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local x NEW_CFLAGS NEW_CXXFLAGS |
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|
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for x in ${CFLAGS} ; do |
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NEW_CFLAGS="${NEW_CFLAGS} $(test-flags ${x})" |
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done |
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for x in ${CXXFLAGS} ; do |
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NEW_CXXFLAGS="${NEW_CXXFLAGS} $(test-flags ${x})" |
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done |
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|
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export CFLAGS=${NEW_CFLAGS} |
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export CXXFLAGS=${NEW_CXXFLAGS} |
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} |
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|
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get-flag() { |
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local f findflag="$1" |
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|
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# this code looks a little flaky but seems to work for |
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# everything we want ... |
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# for example, if CFLAGS="-march=i686": |
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# `get-flag -march` == "-march=i686" |
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# `get-flag march` == "i686" |
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for f in ${CFLAGS} ${CXXFLAGS} ; do |
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if [ "${f/${findflag}}" != "${f}" ] ; then |
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printf "%s\n" "${f/-${findflag}=}" |
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return 0 |
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fi |
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done |
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return 1 |
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} |
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|
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# DEPRECATED - use gcc-specs-relro or gcc-specs-now from toolchain-funcs |
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has_hardened() { |
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addwrite "/dev/stderr" |
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ewarn "has_hardened: deprecated, please use gcc-specs-{relro,now}()!" \ |
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>/dev/stderr |
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|
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test_version_info Hardened && return 0 |
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# The specs file wont exist unless gcc has GCC_SPECS support |
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[[ -f ${GCC_SPECS} && ${GCC_SPECS} != ${GCC_SPECS/hardened/} ]] |
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} |
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|
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# DEPRECATED - use gcc-specs-pie from toolchain-funcs |
| 387 |
# indicate whether PIC is set |
| 388 |
has_pic() { |
| 389 |
addwrite "/dev/stderr" |
| 390 |
ewarn "has_pic: deprecated, please use gcc-specs-pie()!" >/dev/stderr |
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|
| 392 |
[[ ${CFLAGS/-fPIC} != ${CFLAGS} || \ |
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${CFLAGS/-fpic} != ${CFLAGS} || \ |
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-n $(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __PIC__) ]] |
| 395 |
} |
| 396 |
|
| 397 |
# DEPRECATED - use gcc-specs-pie from toolchain-funcs |
| 398 |
# indicate whether PIE is set |
| 399 |
has_pie() { |
| 400 |
addwrite "/dev/stderr" |
| 401 |
ewarn "has_pie: deprecated, please use gcc-specs-pie()!" >/dev/stderr |
| 402 |
|
| 403 |
[[ ${CFLAGS/-fPIE} != ${CFLAGS} || \ |
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${CFLAGS/-fpie} != ${CFLAGS} || \ |
| 405 |
-n $(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __PIE__) || \ |
| 406 |
-n $(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __PIC__) ]] |
| 407 |
# test PIC while waiting for specs to be updated to generate __PIE__ |
| 408 |
} |
| 409 |
|
| 410 |
# DEPRECATED - use gcc-specs-ssp from toolchain-funcs |
| 411 |
# indicate whether code for SSP is being generated for all functions |
| 412 |
has_ssp_all() { |
| 413 |
addwrite "/dev/stderr" |
| 414 |
ewarn "has_ssp_all: deprecated, please use gcc-specs-ssp()!" >/dev/stderr |
| 415 |
|
| 416 |
# note; this matches only -fstack-protector-all |
| 417 |
[[ ${CFLAGS/-fstack-protector-all} != ${CFLAGS} || \ |
| 418 |
-n $(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __SSP_ALL__) ]] || \ |
| 419 |
gcc-specs-ssp |
| 420 |
} |
| 421 |
|
| 422 |
# DEPRECATED - use gcc-specs-ssp from toolchain-funcs |
| 423 |
# indicate whether code for SSP is being generated |
| 424 |
has_ssp() { |
| 425 |
addwrite "/dev/stderr" |
| 426 |
ewarn "has_ssp: deprecated, please use gcc-specs-ssp()!" >/dev/stderr |
| 427 |
|
| 428 |
# note; this matches both -fstack-protector and -fstack-protector-all |
| 429 |
[[ ${CFLAGS/-fstack-protector} != ${CFLAGS} || \ |
| 430 |
-n $(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __SSP__) ]] || \ |
| 431 |
gcc-specs-ssp |
| 432 |
} |
| 433 |
|
| 434 |
has_m64() { |
| 435 |
# this doesnt test if the flag is accepted, it tests if the flag |
| 436 |
# actually -WORKS-. non-multilib gcc will take both -m32 and -m64! |
| 437 |
# please dont replace this function with test_flag in some future |
| 438 |
# clean-up! |
| 439 |
|
| 440 |
local temp="$(emktemp)" |
| 441 |
echo "int main() { return(0); }" > "${temp}".c |
| 442 |
MY_CC=$(tc-getCC) |
| 443 |
${MY_CC/ .*/} -m64 -o "$(emktemp)" "${temp}".c > /dev/null 2>&1 |
| 444 |
local ret=$? |
| 445 |
rm -f "${temp}".c |
| 446 |
[[ ${ret} != 1 ]] && return 0 |
| 447 |
return 1 |
| 448 |
} |
| 449 |
|
| 450 |
has_m32() { |
| 451 |
# this doesnt test if the flag is accepted, it tests if the flag |
| 452 |
# actually -WORKS-. non-multilib gcc will take both -m32 and -m64! |
| 453 |
# please dont replace this function with test_flag in some future |
| 454 |
# clean-up! |
| 455 |
|
| 456 |
[ "$(tc-arch)" = "amd64" ] && has_multilib_profile && return 0 |
| 457 |
|
| 458 |
local temp=$(emktemp) |
| 459 |
echo "int main() { return(0); }" > "${temp}".c |
| 460 |
MY_CC=$(tc-getCC) |
| 461 |
${MY_CC/ .*/} -m32 -o "$(emktemp)" "${temp}".c > /dev/null 2>&1 |
| 462 |
local ret=$? |
| 463 |
rm -f "${temp}".c |
| 464 |
[[ ${ret} != 1 ]] && return 0 |
| 465 |
return 1 |
| 466 |
} |
| 467 |
|
| 468 |
replace-sparc64-flags() { |
| 469 |
local SPARC64_CPUS="ultrasparc3 ultrasparc v9" |
| 470 |
|
| 471 |
if [ "${CFLAGS/mtune}" != "${CFLAGS}" ]; then |
| 472 |
for x in ${SPARC64_CPUS}; do |
| 473 |
CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8}" |
| 474 |
done |
| 475 |
else |
| 476 |
for x in ${SPARC64_CPUS}; do |
| 477 |
CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}" |
| 478 |
done |
| 479 |
fi |
| 480 |
|
| 481 |
if [ "${CXXFLAGS/mtune}" != "${CXXFLAGS}" ]; then |
| 482 |
for x in ${SPARC64_CPUS}; do |
| 483 |
CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8}" |
| 484 |
done |
| 485 |
else |
| 486 |
for x in ${SPARC64_CPUS}; do |
| 487 |
CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}" |
| 488 |
done |
| 489 |
fi |
| 490 |
|
| 491 |
export CFLAGS CXXFLAGS |
| 492 |
} |
| 493 |
|
| 494 |
append-ldflags() { |
| 495 |
export LDFLAGS="${LDFLAGS} $*" |
| 496 |
return 0 |
| 497 |
} |
| 498 |
|
| 499 |
filter-ldflags() { |
| 500 |
local x |
| 501 |
|
| 502 |
# we do this fancy spacing stuff so as to not filter |
| 503 |
# out part of a flag ... we want flag atoms ! :D |
| 504 |
LDFLAGS=" ${LDFLAGS} " |
| 505 |
for x in "$@" ; do |
| 506 |
LDFLAGS=${LDFLAGS// ${x} / } |
| 507 |
done |
| 508 |
[[ -z ${LDFLAGS// } ]] \ |
| 509 |
&& LDFLAGS="" \ |
| 510 |
|| LDFLAGS=${LDFLAGS:1:${#LDFLAGS}-2} |
| 511 |
export LDFLAGS |
| 512 |
return 0 |
| 513 |
} |
| 514 |
|
| 515 |
fstack-flags() { |
| 516 |
if gcc-specs-ssp; then |
| 517 |
[ -z "`is-flag -fno-stack-protector`" ] && |
| 518 |
export CFLAGS="${CFLAGS} `test_flag -fno-stack-protector`" |
| 519 |
fi |
| 520 |
return 0 |
| 521 |
} |
| 522 |
|
| 523 |
# This is thanks to great work from Paul de Vrieze <gentoo-user@devrieze.net>, |
| 524 |
# bug #9016. Also thanks to Jukka Salmi <salmi@gmx.net> (bug #13907) for more |
| 525 |
# fixes. |
| 526 |
# |
| 527 |
# Export CFLAGS and CXXFLAGS that are compadible with gcc-2.95.3 |
| 528 |
gcc2-flags() { |
| 529 |
if [[ $(tc-arch) == "x86" || $(tc-arch) == "amd64" ]] ; then |
| 530 |
CFLAGS=${CFLAGS//-mtune=/-mcpu=} |
| 531 |
CXXFLAGS=${CXXFLAGS//-mtune=/-mcpu=} |
| 532 |
fi |
| 533 |
|
| 534 |
replace-cpu-flags k6-{2,3} k6 |
| 535 |
replace-cpu-flags athlon{,-{tbird,4,xp,mp}} i686 |
| 536 |
|
| 537 |
replace-cpu-flags pentium-mmx i586 |
| 538 |
replace-cpu-flags pentium{2,3,4} i686 |
| 539 |
|
| 540 |
replace-cpu-flags ev6{7,8} ev6 |
| 541 |
|
| 542 |
export CFLAGS CXXFLAGS |
| 543 |
} |
| 544 |
|
| 545 |
# Gets the flags needed for "NOW" binding |
| 546 |
bindnow-flags() { |
| 547 |
case $($(tc-getLD) -v 2>&1 </dev/null) in |
| 548 |
*GNU* | *'with BFD'*) # GNU ld |
| 549 |
echo "-Wl,-z,now" ;; |
| 550 |
*Apple*) # Darwin ld |
| 551 |
echo "-bind_at_load" ;; |
| 552 |
*) |
| 553 |
# Some linkers just recognize -V instead of -v |
| 554 |
case $($(tc-getLD) -V 2>&1 </dev/null) in |
| 555 |
*Solaris*) # Solaris accept almost the same GNU options |
| 556 |
echo "-Wl,-z,now" ;; |
| 557 |
esac |
| 558 |
;; |
| 559 |
esac |
| 560 |
} |
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