/[gentoo-x86]/eclass/flag-o-matic.eclass
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Revision 1.24 Revision 1.56
1# Copyright 1999-2003 Gentoo Technologies, Inc. 1# Copyright 1999-2003 Gentoo Technologies, Inc.
2# Distributed under the terms of the GNU General Public License v2 2# Distributed under the terms of the GNU General Public License v2
3# $Header: /var/cvsroot/gentoo-x86/eclass/flag-o-matic.eclass,v 1.24 2003/07/22 12:48:11 aliz Exp $ 3# $Header: /var/cvsroot/gentoo-x86/eclass/flag-o-matic.eclass,v 1.56 2004/06/10 00:24:57 lv Exp $
4# 4#
5# Author Bart Verwilst <verwilst@gentoo.org> 5# Author Bart Verwilst <verwilst@gentoo.org>
6 6
7ECLASS=flag-o-matic 7ECLASS=flag-o-matic
8INHERITED="$INHERITED $ECLASS" 8INHERITED="$INHERITED $ECLASS"
9IUSE="$IUSE debug"
9 10
10# 11#
11#### filter-flags <flags> #### 12#### filter-flags <flags> ####
12# Remove particular flags from C[XX]FLAGS 13# Remove particular flags from C[XX]FLAGS
13# Matches only complete flags 14# Matches only complete flags
16# Add extra flags to your current C[XX]FLAGS 17# Add extra flags to your current C[XX]FLAGS
17# 18#
18#### replace-flags <orig.flag> <new.flag> ### 19#### replace-flags <orig.flag> <new.flag> ###
19# Replace a flag by another one 20# Replace a flag by another one
20# 21#
22#### replace-cpu-flags <new.cpu> <old.cpus> ###
23# Replace march/mcpu flags that specify <old.cpus>
24# with flags that specify <new.cpu>
25#
21#### is-flag <flag> #### 26#### is-flag <flag> ####
22# Returns "true" if flag is set in C[XX]FLAGS 27# Returns "true" if flag is set in C[XX]FLAGS
23# Matches only complete a flag 28# Matches only complete a flag
24# 29#
25#### strip-flags #### 30#### strip-flags ####
26# Strip C[XX]FLAGS of everything except known 31# Strip C[XX]FLAGS of everything except known
27# good options. 32# good options.
28# 33#
34#### strip-unsupported-flags ####
35# Strip C[XX]FLAGS of any flags not supported by
36# installed version of gcc
37#
29#### get-flag <flag> #### 38#### get-flag <flag> ####
30# Find and echo the value for a particular flag 39# Find and echo the value for a particular flag
31# 40#
32#### replace-sparc64-flags #### 41#### replace-sparc64-flags ####
33# Sets mcpu to v8 and uses the original value 42# Sets mcpu to v8 and uses the original value
34# as mtune if none specified. 43# as mtune if none specified.
35# 44#
36 45#### filter-mfpmath <math types> ####
46# Remove specified math types from the fpmath specification
47# If the user has -mfpmath=sse,386, running `filter-mfpmath sse`
48# will leave the user with -mfpmath=386
49#
50#### append-ldflags ####
51# Add extra flags to your current LDFLAGS
52#
53#### filter-ldflags <flags> ####
54# Remove particular flags from LDFLAGS
55# Matches only complete flags
56#
57#### etexec-flags ####
58# hooked function for hardened gcc that appends
59# -fno-pic to {C,CXX,LD}FLAGS
60# when a package is filtering -fpic, -fPIC, -fpie, -fPIE
61#
62#### fstack-flags ####
63# hooked function for hardened gcc that appends
64# -fno-stack-protector to {C,CXX,LD}FLAGS
65# when a package is filtering -fstack-protector, -fstack-protector-all
66# notice: modern automatic specs files will also suppress -fstack-protector-all
67# when only -fno-stack-protector is given
68#
37 69
38# C[XX]FLAGS that we allow in strip-flags 70# C[XX]FLAGS that we allow in strip-flags
71setup-allowed-flags() {
72 if [ -z "${ALLOWED_FLAGS}" ] ; then
39ALLOWED_FLAGS="-O -O1 -O2 -mcpu -march -mtune -fstack-protector -pipe -g" 73 export ALLOWED_FLAGS="-O -O1 -O2 -mcpu -march -mtune -fstack-protector -fno-unit-at-a-time -pipe -g"
40case "${ARCH}" in 74 case "${ARCH}" in
41 mips) ALLOWED_FLAGS="${ALLOWED_FLAGS} -mips1 -mips2 -mips3 -mips4 -mabi" ;; 75 mips) ALLOWED_FLAGS="${ALLOWED_FLAGS} -mips1 -mips2 -mips3 -mips4 -mabi" ;;
42 amd64) ALLOWED_FLAGS="${ALLOWED_FLAGS} -fPIC" ;; 76 amd64) ALLOWED_FLAGS="${ALLOWED_FLAGS} -fPIC -m64" ;;
77 x86) ALLOWED_FLAGS="${ALLOWED_FLAGS} -m32" ;;
78 alpha) ALLOWED_FLAGS="${ALLOWED_FLAGS} -fPIC" ;;
79 ia64) ALLOWED_FLAGS="${ALLOWED_FLAGS} -fPIC" ;;
43esac 80 esac
81 fi
44 82
45# C[XX]FLAGS that we are think is ok, but needs testing 83 # C[XX]FLAGS that we are think is ok, but needs testing
46# NOTE: currently -Os have issues with gcc3 and K6* arch's 84 # NOTE: currently -Os have issues with gcc3 and K6* arch's
47UNSTABLE_FLAGS="-Os -O3 -freorder-blocks -fprefetch-loop-arrays" 85 export UNSTABLE_FLAGS="-Os -O3 -freorder-blocks -fprefetch-loop-arrays"
48 86 return 0
49filter-mfpmath() {
50 for a in $CFLAGS; do
51 if [ "${a:0:8}" == "-mfpmath" ]; then
52 orig_mfpmath=$a
53 fi
54 done
55
56 mfpmath="$( echo $orig_mfpmath | awk -F '=' '{print $2}' | tr "," " " )"
57 for b in $@; do
58 mfpmath="${mfpmath/$b}"
59 done
60
61 if [ -z "${mfpmath/ }" ]; then
62 filter-flags "$orig_mfpmath"
63 else
64 new_mfpmath="-mfpmath=$( echo $mfpmath | sed -e "s/ /,/g" -e "s/,,/,/g" )"
65 replace-flags "$orig_mfpmath" "$new_mfpmath"
66 fi
67} 87}
68 88
69filter-flags() { 89filter-flags() {
90 for x in "$@" ; do
91 case "${x}" in
92 -fPIC|-fpic|-fPIE|-fpie|-pie) etexec-flags;;
93 -fstack-protector|-fstack-protector-all) fstack-flags;;
94 *) ;;
95 esac
96 done
97
70 # we do this fancy spacing stuff so as to not filter 98 # we do this fancy spacing stuff so as to not filter
71 # out part of a flag ... we want flag atoms ! :D 99 # out part of a flag ... we want flag atoms ! :D
72 export CFLAGS=" ${CFLAGS} " 100 CFLAGS=" ${CFLAGS} "
73 export CXXFLAGS=" ${CXXFLAGS} " 101 CXXFLAGS=" ${CXXFLAGS} "
74 for x in $@ ; do 102 for x in "$@" ; do
75 export CFLAGS="${CFLAGS/ ${x} / }" 103 CFLAGS="${CFLAGS// ${x} / }"
76 export CXXFLAGS="${CXXFLAGS/ ${x} / }" 104 CXXFLAGS="${CXXFLAGS// ${x} / }"
77 done 105 done
78 export CFLAGS="${CFLAGS:1:${#CFLAGS}-2}" 106 CFLAGS="${CFLAGS:1:${#CFLAGS}-2}"
79 export CXXFLAGS="${CXXFLAGS:1:${#CXXFLAGS}-2}" 107 CXXFLAGS="${CXXFLAGS:1:${#CXXFLAGS}-2}"
108 return 0
109}
110
111filter-lfs-flags() {
112 filter-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
113}
114
115append-lfs-flags() {
116 append-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
80} 117}
81 118
82append-flags() { 119append-flags() {
83 CFLAGS="${CFLAGS} $@" 120 export CFLAGS="${CFLAGS} $@"
84 CXXFLAGS="${CXXFLAGS} $@" 121 export CXXFLAGS="${CXXFLAGS} $@"
122 [ "`is-flag -fno-stack-protector`" -o "`is-flag -fno-stack-protector-all`" ] && fstack-flags
123 return 0
85} 124}
86 125
87replace-flags() { 126replace-flags() {
127 # we do this fancy spacing stuff so as to not filter
128 # out part of a flag ... we want flag atoms ! :D
129 CFLAGS=" ${CFLAGS} "
130 CXXFLAGS=" ${CXXFLAGS} "
88 CFLAGS="${CFLAGS/${1}/${2} }" 131 CFLAGS="${CFLAGS// ${1} / ${2} }"
89 CXXFLAGS="${CXXFLAGS/${1}/${2} }" 132 CXXFLAGS="${CXXFLAGS// ${1} / ${2} }"
133 CFLAGS="${CFLAGS:1:${#CFLAGS}-2}"
134 CXXFLAGS="${CXXFLAGS:1:${#CXXFLAGS}-2}"
135 return 0
136}
137
138replace-cpu-flags() {
139 local newcpu="$1" ; shift
140 local oldcpu=""
141 for oldcpu in "$@" ; do
142 replace-flags -march=${oldcpu} -march=${newcpu}
143 replace-flags -mcpu=${oldcpu} -mcpu=${newcpu}
144 replace-flags -mtune=${oldcpu} -mtune=${newcpu}
145 done
146 return 0
90} 147}
91 148
92is-flag() { 149is-flag() {
93 for x in ${CFLAGS} ${CXXFLAGS} ; do 150 for x in ${CFLAGS} ${CXXFLAGS} ; do
94 if [ "${x}" == "$1" ] ; then 151 if [ "${x}" == "$1" ] ; then
97 fi 154 fi
98 done 155 done
99 return 1 156 return 1
100} 157}
101 158
159filter-mfpmath() {
160 # save the original -mfpmath flag
161 local orig_mfpmath="`get-flag -mfpmath`"
162 # get the value of the current -mfpmath flag
163 local new_math=" `get-flag mfpmath | tr , ' '` "
164 # figure out which math values are to be removed
165 local prune_math=""
166 for prune_math in "$@" ; do
167 new_math="${new_math/ ${prune_math} / }"
168 done
169 new_math="`echo ${new_math:1:${#new_math}-2} | tr ' ' ,`"
170
171 if [ -z "${new_math}" ] ; then
172 # if we're removing all user specified math values are
173 # slated for removal, then we just filter the flag
174 filter-flags ${orig_mfpmath}
175 else
176 # if we only want to filter some of the user specified
177 # math values, then we replace the current flag
178 replace-flags ${orig_mfpmath} -mfpmath=${new_math}
179 fi
180 return 0
181}
182
102strip-flags() { 183strip-flags() {
184 setup-allowed-flags
185
103 local NEW_CFLAGS="" 186 local NEW_CFLAGS=""
104 local NEW_CXXFLAGS="" 187 local NEW_CXXFLAGS=""
105 188
106 # Allow unstable C[XX]FLAGS if we are using unstable profile ... 189 # Allow unstable C[XX]FLAGS if we are using unstable profile ...
107 if [ `has ~${ARCH} ${ACCEPT_KEYWORDS}` ] ; then 190 if has ~${ARCH} ${ACCEPT_KEYWORDS} ; then
108 [ `use debug` ] && einfo "Enabling the use of some unstable flags" 191 use debug && einfo "Enabling the use of some unstable flags"
109 ALLOWED_FLAGS="${ALLOWED_FLAGS} ${UNSTABLE_FLAGS}" 192 ALLOWED_FLAGS="${ALLOWED_FLAGS} ${UNSTABLE_FLAGS}"
110 fi 193 fi
111 194
112 set -f 195 set -f
113 196
135 break 218 break
136 fi 219 fi
137 done 220 done
138 done 221 done
139 222
223 # In case we filtered out all optimization flags fallback to -O2
224 if [ "${CFLAGS/-O}" != "${CFLAGS}" -a "${NEW_CFLAGS/-O}" = "${NEW_CFLAGS}" ]; then
225 NEW_CFLAGS="${NEW_CFLAGS} -O2"
226 fi
227 if [ "${CXXFLAGS/-O}" != "${CXXFLAGS}" -a "${NEW_CXXFLAGS/-O}" = "${NEW_CXXFLAGS}" ]; then
228 NEW_CXXFLAGS="${NEW_CXXFLAGS} -O2"
229 fi
230
140 set +f 231 set +f
141 232
142 [ `use debug` ] \ 233 use debug \
143 && einfo "CFLAGS=\"${NEW_CFLAGS}\"" \ 234 && einfo "CFLAGS=\"${NEW_CFLAGS}\"" \
144 && einfo "CXXFLAGS=\"${NEW_CXXFLAGS}\"" 235 && einfo "CXXFLAGS=\"${NEW_CXXFLAGS}\""
145 236
146 export CFLAGS="${NEW_CFLAGS}" 237 export CFLAGS="${NEW_CFLAGS}"
147 export CXXFLAGS="${NEW_CXXFLAGS}" 238 export CXXFLAGS="${NEW_CXXFLAGS}"
239 return 0
240}
241
242test_flag() {
243 if [ -z "`gcc -S -xc "$@" -o /dev/null /dev/null 2>&1`" ]; then
244 echo "$@"
245 return 0
246 fi
247 return 1
248}
249
250strip-unsupported-flags() {
251 for x in ${CFLAGS} ; do
252 NEW_CFLAGS=${NEW_CFLAGS}" ""`test_flag ${x}`"
253 done
254 for x in ${CXXFLAGS} ; do
255 NEW_CXXFLAGS=${NEW_CXXFLAGS}" ""`test_flag ${x}`"
256 done
257
258 export CFLAGS="${NEW_CFLAGS}"
259 export CXXFLAGS="${NEW_CXXFLAGS}"
148} 260}
149 261
150get-flag() { 262get-flag() {
263 # this code looks a little flaky but seems to work for
264 # everything we want ...
265 # for example, if CFLAGS="-march=i686":
266 # `get-flags -march` == "-march=i686"
267 # `get-flags march` == "i686"
151 local findflag="$1" 268 local findflag="$1"
152
153 for f in ${CFLAGS} ${CXXFLAGS} ; do 269 for f in ${CFLAGS} ${CXXFLAGS} ; do
154 if [ "${f/${findflag}}" != "${f}" ] ; then 270 if [ "${f/${findflag}}" != "${f}" ] ; then
155 echo "${f/-${findflag}=}" 271 echo "${f/-${findflag}=}"
156 return 272 return 0
157 fi 273 fi
158 done 274 done
275 return 1
276}
277
278has_hardened() {
279 local cc=${CC:-gcc}
280 [[ $(${cc%% *} --version 2>&1) == *Hardened* ]]
281 return $?
282}
283
284has_pic() {
285 [ "${CFLAGS/-fPIC}" != "${CFLAGS}" ] && return 0
286 [ "${CFLAGS/-fpic}" != "${CFLAGS}" ] && return 0
287 [ ! -z "`${CC/ .*/} --version| grep pie`" ] && return 0
288 return 1
289}
290
291has_pie() {
292 [ "${CFLAGS/-fPIE}" != "${CFLAGS}" ] && return 0
293 [ "${CFLAGS/-fpie}" != "${CFLAGS}" ] && return 0
294 [ ! -z "`${CC/ .*/} --version| grep pie`" ] && return 0
295 return 1
296}
297
298has_ssp() {
299 [ "${CFLAGS/-fstack-protector}" != "${CFLAGS}" ] && return 0
300 [ ! -z "`${CC/ .*/} --version| grep ssp`" ] && return 0
301 return 1
302}
303
304has_m64() {
305 temp=`mktemp`
306 echo "int main() { return(0); }" > ${temp}.c
307 gcc -m64 -o /dev/null ${temp}.c > /dev/null 2>&1
308 ret=$?
309 rm -f ${temp}.c
310 [ "$ret" != "1" ] && return 0
311 return 1
312}
313
314has_m32() {
315 temp=`mktemp`
316 echo "int main() { return(0); }" > ${temp}.c
317 gcc -m32 -o /dev/null ${temp}.c > /dev/null 2>&1
318 ret=$?
319 rm -f ${temp}.c
320 [ "$ret" != "1" ] && return 0
321 return 1
159} 322}
160 323
161replace-sparc64-flags() { 324replace-sparc64-flags() {
162 local SPARC64_CPUS="ultrasparc v9" 325 local SPARC64_CPUS="ultrasparc v9"
163 326
185 do 348 do
186 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}" 349 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
187 done 350 done
188 fi 351 fi
189} 352}
353
354append-ldflags() {
355 LDFLAGS="${LDFLAGS} $@"
356 return 0
357}
358
359filter-ldflags() {
360 # we do this fancy spacing stuff so as to not filter
361 # out part of a flag ... we want flag atoms ! :D
362 LDFLAGS=" ${LDFLAGS} "
363 for x in "$@" ; do
364 LDFLAGS="${LDFLAGS// ${x} / }"
365 done
366 LDFLAGS="${LDFLAGS:1:${#LDFLAGS}-2}"
367 return 0
368}
369
370etexec-flags() {
371 # if your not using a hardened compiler you wont need this
372 # PIC/no-pic kludge in the first place.
373 has_hardened || return
374
375 has_pie || has_pic
376 if [ $? == 0 ] ; then
377 [ -z "`is-flag -fno-pic`" ] &&
378 export CFLAGS="${CFLAGS} `test_flag -fno-pic`"
379
380 [ -z "`is-flag -nopie`" ] &&
381 export CFLAGS="${CFLAGS} `test_flag -nopie`"
382 fi
383}
384
385fstack-flags() {
386 has_ssp
387 if [ $? == 0 ] ; then
388 [ -z "`is-flag -fno-stack-protector`" ] &&
389 export CFLAGS="${CFLAGS} `test_flag -fno-stack-protector`"
390 fi
391}
392

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