gentoo-x86/eclass/flag-o-matic.eclass

# 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 1.89 2005/07/06 20:23:20 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
}
1	# Copyright 1999-2005 Gentoo Foundation
2	# Distributed under the terms of the GNU General Public License v2
3	# $Header: /var/cvsroot/gentoo-x86/eclass/flag-o-matic.eclass,v 1.89 2005/07/06 20:23:20 agriffis Exp $
4
5
6	# need access to emktemp()
7	inherit eutils toolchain-funcs multilib
8
9	#
10	#### filter-flags <flags> ####
11	# Remove particular flags from C[XX]FLAGS
12	# Matches only complete flags
13	#
14	#### append-flags <flags> ####
15	# Add extra flags to your current C[XX]FLAGS
16	#
17	#### replace-flags <orig.flag> <new.flag> ###
18	# Replace a flag by another one
19	#
20	#### replace-cpu-flags <old.cpus> <new.cpu> ###
21	# Replace march/mcpu flags that specify <old.cpus>
22	# with flags that specify <new.cpu>
23	#
24	#### is-flag <flag> ####
25	# Returns "true" if flag is set in C[XX]FLAGS
26	# Matches only complete a flag
27	#
28	#### strip-flags ####
29	# Strip C[XX]FLAGS of everything except known
30	# good options.
31	#
32	#### strip-unsupported-flags ####
33	# Strip C[XX]FLAGS of any flags not supported by
34	# installed version of gcc
35	#
36	#### get-flag <flag> ####
37	# Find and echo the value for a particular flag
38	#
39	#### replace-sparc64-flags ####
40	# Sets mcpu to v8 and uses the original value
41	# as mtune if none specified.
42	#
43	#### filter-mfpmath <math types> ####
44	# Remove specified math types from the fpmath specification
45	# If the user has -mfpmath=sse,386, running `filter-mfpmath sse`
46	# will leave the user with -mfpmath=386
47	#
48	#### append-ldflags ####
49	# Add extra flags to your current LDFLAGS
50	#
51	#### filter-ldflags <flags> ####
52	# Remove particular flags from LDFLAGS
53	# Matches only complete flags
54	#
55	#### fstack-flags ####
56	# hooked function for hardened gcc that appends
57	# -fno-stack-protector to {C,CXX,LD}FLAGS
58	# when a package is filtering -fstack-protector, -fstack-protector-all
59	# notice: modern automatic specs files will also suppress -fstack-protector-all
60	# when only -fno-stack-protector is given
61	#
62	#### has_pic ####
63	# Returns true if the compiler by default or with current CFLAGS
64	# builds position-independent code.
65	#
66	#### has_ssp_all ####
67	# Returns true if the compiler by default or with current CFLAGS
68	# generates stack smash protections for all functions
69	#
70	#### has_ssp ####
71	# Returns true if the compiler by default or with current CFLAGS
72	# generates stack smash protections for most vulnerable functions
73	#
74
75	# C[XX]FLAGS that we allow in strip-flags
76	setup-allowed-flags() {
77	if [[ -z ${ALLOWED_FLAGS} ]] ; then
78	export ALLOWED_FLAGS="-pipe"
79	export ALLOWED_FLAGS="${ALLOWED_FLAGS} -O -O0 -O1 -O2 -mcpu -march -mtune"
80	export ALLOWED_FLAGS="${ALLOWED_FLAGS} -fstack-protector -fstack-protector-all"
81	export ALLOWED_FLAGS="${ALLOWED_FLAGS} -fbounds-checking -fno-bounds-checking"
82	export ALLOWED_FLAGS="${ALLOWED_FLAGS} -fno-pie -fno-unit-at-a-time"
83	export ALLOWED_FLAGS="${ALLOWED_FLAGS} -g -g0 -g1 -g2 -g3 -ggdb -ggdb0 -ggdb1 -ggdb2 -ggdb3"
84	fi
85	# allow a bunch of flags that negate features / control ABI
86	ALLOWED_FLAGS="${ALLOWED_FLAGS} -fno-stack-protector -fno-stack-protector-all"
87	ALLOWED_FLAGS="${ALLOWED_FLAGS} -mregparm -mno-app-regs -mapp-regs \
88	-mno-mmx -mno-sse -mno-sse2 -mno-sse3 -mno-3dnow \
89	-mips1 -mips2 -mips3 -mips4 -mips32 -mips64 -mips16 \
90	-msoft-float -mno-soft-float -mhard-float -mno-hard-float -mfpu \
91	-mieee -mieee-with-inexact \
92	-mflat -mno-flat -mno-faster-structs -mfaster-structs \
93	-m32 -m64 -mabi -mlittle-endian -mbig-endian -EL -EB -fPIC \
94	-mlive-g0 -mcmodel -mstack-bias -mno-stack-bias"
95
96	# C[XX]FLAGS that we are think is ok, but needs testing
97	# NOTE: currently -Os have issues with gcc3 and K6* arch's
98	export UNSTABLE_FLAGS="-Os -O3 -freorder-blocks -fprefetch-loop-arrays"
99	return 0
100	}
101
102	filter-flags() {
103	local x f fset
104	declare -a new_CFLAGS new_CXXFLAGS
105
106	for x in "$@" ; do
107	case "${x}" in
108	-fPIC\|-fpic\|-fPIE\|-fpie\|-pie)
109	append-flags `test_flag -fno-pie`;;
110	-fstack-protector\|-fstack-protector-all)
111	fstack-flags;;
112	esac
113	done
114
115	for fset in CFLAGS CXXFLAGS; do
116	# Looping over the flags instead of using a global
117	# substitution ensures that we're working with flag atoms.
118	# Otherwise globs like -O* have the potential to wipe out the
119	# list of flags.
120	for f in ${!fset}; do
121	for x in "$@"; do
122	# Note this should work with globs like -O*
123	[[ ${f} == ${x} ]] && continue 2
124	done
125	eval new_${fset}\[\${\#new_${fset}\[@]}]=\${f}
126	done
127	eval export ${fset}=\${new_${fset}\[*]}
128	done
129
130	return 0
131	}
132
133	filter-lfs-flags() {
134	filter-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
135	}
136
137	append-lfs-flags() {
138	append-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
139	}
140
141	append-flags() {
142	[[ -z $* ]] && return 0
143	export CFLAGS="${CFLAGS} $*"
144	export CXXFLAGS="${CXXFLAGS} $*"
145	[ -n "`is-flag -fno-stack-protector`" -o \
146	-n "`is-flag -fno-stack-protector-all`" ] && fstack-flags
147	return 0
148	}
149
150	replace-flags() {
151	local f fset
152	declare -a new_CFLAGS new_CXXFLAGS
153
154	for fset in CFLAGS CXXFLAGS; do
155	# Looping over the flags instead of using a global
156	# substitution ensures that we're working with flag atoms.
157	# Otherwise globs like -O* have the potential to wipe out the
158	# list of flags.
159	for f in ${!fset}; do
160	# Note this should work with globs like -O*
161	[[ ${f} == ${1} ]] && f=${2}
162	eval new_${fset}\[\${\#new_${fset}\[@]}]=\${f}
163	done
164	eval export ${fset}=\${new_${fset}\[*]}
165	done
166
167	return 0
168	}
169
170	replace-cpu-flags() {
171	local newcpu="$#" ; newcpu="${!newcpu}"
172	while [ $# -gt 1 ] ; do
173	# quote to make sure that no globbing is done (particularly on
174	# ${oldcpu} prior to calling replace-flags
175	replace-flags "-march=${1}" "-march=${newcpu}"
176	replace-flags "-mcpu=${1}" "-mcpu=${newcpu}"
177	replace-flags "-mtune=${1}" "-mtune=${newcpu}"
178	shift
179	done
180	return 0
181	}
182
183	is-flag() {
184	local x
185
186	for x in ${CFLAGS} ${CXXFLAGS} ; do
187	# Note this should work with globs like -mcpu=ultrasparc*
188	if [[ ${x} == ${1} ]]; then
189	echo true
190	return 0
191	fi
192	done
193	return 1
194	}
195
196	filter-mfpmath() {
197	local orig_mfpmath new_math prune_math
198
199	# save the original -mfpmath flag
200	orig_mfpmath="`get-flag -mfpmath`"
201	# get the value of the current -mfpmath flag
202	new_math=" `get-flag mfpmath \| tr , ' '` "
203	# figure out which math values are to be removed
204	prune_math=""
205	for prune_math in "$@" ; do
206	new_math="${new_math/ ${prune_math} / }"
207	done
208	new_math="`echo ${new_math:1:${#new_math}-2} \| tr ' ' ,`"
209
210	if [ -z "${new_math}" ] ; then
211	# if we're removing all user specified math values are
212	# slated for removal, then we just filter the flag
213	filter-flags ${orig_mfpmath}
214	else
215	# if we only want to filter some of the user specified
216	# math values, then we replace the current flag
217	replace-flags ${orig_mfpmath} -mfpmath=${new_math}
218	fi
219	return 0
220	}
221
222	strip-flags() {
223	local x y flag NEW_CFLAGS NEW_CXXFLAGS
224
225	setup-allowed-flags
226
227	local NEW_CFLAGS=""
228	local NEW_CXXFLAGS=""
229
230	# Allow unstable C[XX]FLAGS if we are using unstable profile ...
231	if has ~$(tc-arch) ${ACCEPT_KEYWORDS} ; then
232	ALLOWED_FLAGS="${ALLOWED_FLAGS} ${UNSTABLE_FLAGS}"
233	fi
234
235	set -f # disable pathname expansion
236
237	for x in ${CFLAGS}; do
238	for y in ${ALLOWED_FLAGS}; do
239	flag=${x%%=*}
240	if [ "${flag%%${y}}" = "" ] ; then
241	NEW_CFLAGS="${NEW_CFLAGS} ${x}"
242	break
243	fi
244	done
245	done
246
247	for x in ${CXXFLAGS}; do
248	for y in ${ALLOWED_FLAGS}; do
249	flag=${x%%=*}
250	if [ "${flag%%${y}}" = "" ] ; then
251	NEW_CXXFLAGS="${NEW_CXXFLAGS} ${x}"
252	break
253	fi
254	done
255	done
256
257	# In case we filtered out all optimization flags fallback to -O2
258	if [ "${CFLAGS/-O}" != "${CFLAGS}" -a "${NEW_CFLAGS/-O}" = "${NEW_CFLAGS}" ]; then
259	NEW_CFLAGS="${NEW_CFLAGS} -O2"
260	fi
261	if [ "${CXXFLAGS/-O}" != "${CXXFLAGS}" -a "${NEW_CXXFLAGS/-O}" = "${NEW_CXXFLAGS}" ]; then
262	NEW_CXXFLAGS="${NEW_CXXFLAGS} -O2"
263	fi
264
265	set +f # re-enable pathname expansion
266
267	export CFLAGS="${NEW_CFLAGS}"
268	export CXXFLAGS="${NEW_CXXFLAGS}"
269	return 0
270	}
271
272	test_flag() {
273	if $(tc-getCC) -S -xc "$@" -o "$(emktemp)" /dev/null &>/dev/null; then
274	printf "%s\n" "$*"
275	return 0
276	fi
277	return 1
278	}
279
280	test_version_info() {
281	if [[ $($(tc-getCC) --version 2>&1) == $1 ]]; then
282	return 0
283	else
284	return 1
285	fi
286	}
287
288	strip-unsupported-flags() {
289	local NEW_CFLAGS NEW_CXXFLAGS
290
291	for x in ${CFLAGS} ; do
292	NEW_CFLAGS="${NEW_CFLAGS} `test_flag ${x}`"
293	done
294	for x in ${CXXFLAGS} ; do
295	NEW_CXXFLAGS="${NEW_CXXFLAGS} `test_flag ${x}`"
296	done
297
298	export CFLAGS="${NEW_CFLAGS}"
299	export CXXFLAGS="${NEW_CXXFLAGS}"
300	}
301
302	get-flag() {
303	local f findflag="$1"
304
305	# this code looks a little flaky but seems to work for
306	# everything we want ...
307	# for example, if CFLAGS="-march=i686":
308	# `get-flag -march` == "-march=i686"
309	# `get-flag march` == "i686"
310	for f in ${CFLAGS} ${CXXFLAGS} ; do
311	if [ "${f/${findflag}}" != "${f}" ] ; then
312	printf "%s\n" "${f/-${findflag}=}"
313	return 0
314	fi
315	done
316	return 1
317	}
318
319	has_hardened() {
320	test_version_info Hardened && return 0
321	# the specs file wont exist unless gcc has GCC_SPECS support
322	[ -f "${GCC_SPECS}" -a "${GCC_SPECS}" != "${GCC_SPECS/hardened/}" ] && \
323	return 0
324	return 1
325	}
326
327	# indicate whether PIC is set
328	has_pic() {
329	[ "${CFLAGS/-fPIC}" != "${CFLAGS}" ] && return 0
330	[ "${CFLAGS/-fpic}" != "${CFLAGS}" ] && return 0
331	[ "$(echo \| $(tc-getCC) ${CFLAGS} -E -dM - \| grep __PIC__)" ] && return 0
332	return 1
333	}
334
335	# indicate whether PIE is set
336	has_pie() {
337	[ "${CFLAGS/-fPIE}" != "${CFLAGS}" ] && return 0
338	[ "${CFLAGS/-fpie}" != "${CFLAGS}" ] && return 0
339	[ "$(echo \| $(tc-getCC) ${CFLAGS} -E -dM - \| grep __PIE__)" ] && return 0
340	# test PIC while waiting for specs to be updated to generate __PIE__
341	[ "$(echo \| $(tc-getCC) ${CFLAGS} -E -dM - \| grep __PIC__)" ] && return 0
342	return 1
343	}
344
345	# indicate whether code for SSP is being generated for all functions
346	has_ssp_all() {
347	# note; this matches only -fstack-protector-all
348	[ "${CFLAGS/-fstack-protector-all}" != "${CFLAGS}" ] && return 0
349	[ "$(echo \| $(tc-getCC) ${CFLAGS} -E -dM - \| grep __SSP_ALL__)" ] && return 0
350	return 1
351	}
352
353	# indicate whether code for SSP is being generated
354	has_ssp() {
355	# note; this matches both -fstack-protector and -fstack-protector-all
356	[ "${CFLAGS/-fstack-protector}" != "${CFLAGS}" ] && return 0
357	[ "$(echo \| $(tc-getCC) ${CFLAGS} -E -dM - \| grep __SSP__)" ] && return 0
358	return 1
359	}
360
361	has_m64() {
362	# this doesnt test if the flag is accepted, it tests if the flag
363	# actually -WORKS-. non-multilib gcc will take both -m32 and -m64!
364	# please dont replace this function with test_flag in some future
365	# clean-up!
366	local temp="$(emktemp)"
367	echo "int main() { return(0); }" > ${temp}.c
368	MY_CC=$(tc-getCC)
369	${MY_CC/ .*/} -m64 -o "$(emktemp)" ${temp}.c > /dev/null 2>&1
370	local ret=$?
371	rm -f ${temp}.c
372	[ "$ret" != "1" ] && return 0
373	return 1
374	}
375
376	has_m32() {
377	# this doesnt test if the flag is accepted, it tests if the flag
378	# actually -WORKS-. non-multilib gcc will take both -m32 and -m64!
379	# please dont replace this function with test_flag in some future
380	# clean-up!
381
382	[ "$(tc-arch)" = "amd64" ] && has_multilib_profile && return 0
383
384	local temp="$(emktemp)"
385	echo "int main() { return(0); }" > ${temp}.c
386	MY_CC=$(tc-getCC)
387	${MY_CC/ .*/} -m32 -o "$(emktemp)" ${temp}.c > /dev/null 2>&1
388	local ret=$?
389	rm -f ${temp}.c
390	[ "$ret" != "1" ] && return 0
391	return 1
392	}
393
394	replace-sparc64-flags() {
395	local SPARC64_CPUS="ultrasparc v9"
396
397	if [ "${CFLAGS/mtune}" != "${CFLAGS}" ]; then
398	for x in ${SPARC64_CPUS}; do
399	CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8}"
400	done
401	else
402	for x in ${SPARC64_CPUS}; do
403	CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
404	done
405	fi
406
407	if [ "${CXXFLAGS/mtune}" != "${CXXFLAGS}" ]; then
408	for x in ${SPARC64_CPUS}; do
409	CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8}"
410	done
411	else
412	for x in ${SPARC64_CPUS}; do
413	CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
414	done
415	fi
416
417	export CFLAGS CXXFLAGS
418	}
419
420	append-ldflags() {
421	export LDFLAGS="${LDFLAGS} $*"
422	return 0
423	}
424
425	filter-ldflags() {
426	local x
427
428	# we do this fancy spacing stuff so as to not filter
429	# out part of a flag ... we want flag atoms ! :D
430	LDFLAGS=" ${LDFLAGS} "
431	for x in "$@" ; do
432	LDFLAGS=${LDFLAGS// ${x} / }
433	done
434	[[ -z ${LDFLAGS// } ]] \
435	&& LDFLAGS="" \
436	\|\| LDFLAGS=${LDFLAGS:1:${#LDFLAGS}-2}
437	export LDFLAGS
438	return 0
439	}
440
441	fstack-flags() {
442	if has_ssp; then
443	[ -z "`is-flag -fno-stack-protector`" ] &&
444	export CFLAGS="${CFLAGS} `test_flag -fno-stack-protector`"
445	fi
446	return 0
447	}
448
449	# This is thanks to great work from Paul de Vrieze <gentoo-user@devrieze.net>,
450	# bug #9016. Also thanks to Jukka Salmi <salmi@gmx.net> (bug #13907) for more
451	# fixes.
452	#
453	# Export CFLAGS and CXXFLAGS that are compadible with gcc-2.95.3
454	gcc2-flags() {
455	if [[ $(tc-arch) == "x86" \|\| $(tc-arch) == "amd64" ]] ; then
456	CFLAGS=${CFLAGS//-mtune=/-mcpu=}
457	CXXFLAGS=${CXXFLAGS//-mtune=/-mcpu=}
458	fi
459
460	replace-cpu-flags k6-{2,3} k6
461	replace-cpu-flags athlon{,-{tbird,4,xp,mp}} i686
462
463	replace-cpu-flags pentium-mmx i586
464	replace-cpu-flags pentium{2,3,4} i686
465
466	replace-cpu-flags ev6{7,8} ev6
467
468	export CFLAGS CXXFLAGS
469	}