/[gentoo-x86]/eclass/flag-o-matic.eclass
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Revision 1.3 Revision 1.55
1# Copyright 1999-2002 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 1.55 2004/06/08 20:49:52 lv Exp $
4#
3# Author Bart Verwilst <verwilst@gentoo.org> 5# Author Bart Verwilst <verwilst@gentoo.org>
4# /space/gentoo/cvsroot/gentoo-x86/eclass/flag-o-matic.eclass 6
5ECLASS=flag-o-matic 7ECLASS=flag-o-matic
8INHERITED="$INHERITED $ECLASS"
9IUSE="$IUSE debug"
6 10
7# 11#
8#### filter-flags <flag> #### 12#### filter-flags <flags> ####
9# Remove particular flags from C[XX]FLAGS 13# Remove particular flags from C[XX]FLAGS
14# Matches only complete flags
10# 15#
11#### append-flags <flag> #### 16#### append-flags <flags> ####
12# Add extra flags to your current C[XX]FLAGS 17# Add extra flags to your current C[XX]FLAGS
13# 18#
14#### change-flags <orig.flag> <new.flag> ### 19#### replace-flags <orig.flag> <new.flag> ###
15# Replace a flag by another one 20# Replace a flag by another one
16# 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#
26#### is-flag <flag> ####
27# Returns "true" if flag is set in C[XX]FLAGS
28# Matches only complete a flag
29#
30#### strip-flags ####
31# Strip C[XX]FLAGS of everything except known
32# good options.
33#
34#### strip-unsupported-flags ####
35# Strip C[XX]FLAGS of any flags not supported by
36# installed version of gcc
37#
38#### get-flag <flag> ####
39# Find and echo the value for a particular flag
40#
41#### replace-sparc64-flags ####
42# Sets mcpu to v8 and uses the original value
43# as mtune if none specified.
44#
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#
17 69
70# C[XX]FLAGS that we allow in strip-flags
71setup-allowed-flags() {
72 if [ -z "${ALLOWED_FLAGS}" ] ; then
73 export ALLOWED_FLAGS="-O -O1 -O2 -mcpu -march -mtune -fstack-protector -fno-unit-at-a-time -pipe -g"
74 case "${ARCH}" in
75 mips) ALLOWED_FLAGS="${ALLOWED_FLAGS} -mips1 -mips2 -mips3 -mips4 -mabi" ;;
76 amd64) ALLOWED_FLAGS="${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" ;;
80 esac
81 fi
18 82
83 # C[XX]FLAGS that we are think is ok, but needs testing
84 # NOTE: currently -Os have issues with gcc3 and K6* arch's
85 export UNSTABLE_FLAGS="-Os -O3 -freorder-blocks -fprefetch-loop-arrays"
86 return 0
87}
88
19filter-flags () { 89filter-flags() {
20
21 for x in $1; do 90 for x in "$@" ; 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
98 # we do this fancy spacing stuff so as to not filter
99 # out part of a flag ... we want flag atoms ! :D
100 CFLAGS=" ${CFLAGS} "
101 CXXFLAGS=" ${CXXFLAGS} "
102 for x in "$@" ; do
22 CFLAGS="${CFLAGS/$x}" 103 CFLAGS="${CFLAGS// ${x} / }"
23 CXXFLAGS="${CXXFLAGS/$x}" 104 CXXFLAGS="${CXXFLAGS// ${x} / }"
24 done 105 done
25 106 CFLAGS="${CFLAGS:1:${#CFLAGS}-2}"
107 CXXFLAGS="${CXXFLAGS:1:${#CXXFLAGS}-2}"
108 return 0
26} 109}
27 110
111filter-lfs-flags() {
112 filter-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
113}
114
115append-lfs-flags() {
116 append-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
117}
118
28append-flags () { 119append-flags() {
120 export CFLAGS="${CFLAGS} $@"
121 export CXXFLAGS="${CXXFLAGS} $@"
122 [ "`is-flag -fno-stack-protector`" -o "`is-flag -fno-stack-protector-all`" ] && fstack-flags
123 return 0
124}
29 125
30 126replace-flags() {
127 # we do this fancy spacing stuff so as to not filter
128 # out part of a flag ... we want flag atoms ! :D
31 CFLAGS="$CFLAGS $1" 129 CFLAGS=" ${CFLAGS} "
32 CXXFLAGS="$CXXFLAGS $1" 130 CXXFLAGS=" ${CXXFLAGS} "
33
34}
35
36change-flags () {
37
38 CFLAGS="${CFLAGS/${1}/${2}" 131 CFLAGS="${CFLAGS// ${1} / ${2} }"
39 CXXFLAGS="${CXXFLAGS/${1}/${2}" 132 CXXFLAGS="${CXXFLAGS// ${1} / ${2} }"
40 133 CFLAGS="${CFLAGS:1:${#CFLAGS}-2}"
134 CXXFLAGS="${CXXFLAGS:1:${#CXXFLAGS}-2}"
135 return 0
41} 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
147}
148
149is-flag() {
150 for x in ${CFLAGS} ${CXXFLAGS} ; do
151 if [ "${x}" == "$1" ] ; then
152 echo true
153 return 0
154 fi
155 done
156 return 1
157}
158
159filter-mfpmath() {
160 # save the original -mfpmath flag
161 local orig_mfpmath="`get-flag -mfpmath`"
162 # get the value of the current -mfpmath flag
163 local new_math=" `get-flag mfpmath | tr , ' '` "
164 # figure out which math values are to be removed
165 local prune_math=""
166 for prune_math in "$@" ; 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
183strip-flags() {
184 setup-allowed-flags
185
186 local NEW_CFLAGS=""
187 local NEW_CXXFLAGS=""
188
189 # Allow unstable C[XX]FLAGS if we are using unstable profile ...
190 if has ~${ARCH} ${ACCEPT_KEYWORDS} ; then
191 use debug && einfo "Enabling the use of some unstable flags"
192 ALLOWED_FLAGS="${ALLOWED_FLAGS} ${UNSTABLE_FLAGS}"
193 fi
194
195 set -f
196
197 for x in ${CFLAGS}
198 do
199 for y in ${ALLOWED_FLAGS}
200 do
201 flag=${x%%=*}
202 if [ "${flag%%${y}}" = "" ]
203 then
204 NEW_CFLAGS="${NEW_CFLAGS} ${x}"
205 break
206 fi
207 done
208 done
209
210 for x in ${CXXFLAGS}
211 do
212 for y in ${ALLOWED_FLAGS}
213 do
214 flag=${x%%=*}
215 if [ "${flag%%${y}}" = "" ]
216 then
217 NEW_CXXFLAGS="${NEW_CXXFLAGS} ${x}"
218 break
219 fi
220 done
221 done
222
223 # In case we filtered out all optimization flags fallback to -O2
224 if [ "${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="${NEW_CXXFLAGS} -O2"
229 fi
230
231 set +f
232
233 use debug \
234 && einfo "CFLAGS=\"${NEW_CFLAGS}\"" \
235 && einfo "CXXFLAGS=\"${NEW_CXXFLAGS}\""
236
237 export CFLAGS="${NEW_CFLAGS}"
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}"
260}
261
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"
268 local findflag="$1"
269 for f in ${CFLAGS} ${CXXFLAGS} ; do
270 if [ "${f/${findflag}}" != "${f}" ] ; then
271 echo "${f/-${findflag}=}"
272 return 0
273 fi
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
304replace-sparc64-flags() {
305 local SPARC64_CPUS="ultrasparc v9"
306
307 if [ "${CFLAGS/mtune}" != "${CFLAGS}" ]
308 then
309 for x in ${SPARC64_CPUS}
310 do
311 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8}"
312 done
313 else
314 for x in ${SPARC64_CPUS}
315 do
316 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
317 done
318 fi
319
320 if [ "${CXXFLAGS/mtune}" != "${CXXFLAGS}" ]
321 then
322 for x in ${SPARC64_CPUS}
323 do
324 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8}"
325 done
326 else
327 for x in ${SPARC64_CPUS}
328 do
329 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
330 done
331 fi
332}
333
334append-ldflags() {
335 LDFLAGS="${LDFLAGS} $@"
336 return 0
337}
338
339filter-ldflags() {
340 # we do this fancy spacing stuff so as to not filter
341 # out part of a flag ... we want flag atoms ! :D
342 LDFLAGS=" ${LDFLAGS} "
343 for x in "$@" ; do
344 LDFLAGS="${LDFLAGS// ${x} / }"
345 done
346 LDFLAGS="${LDFLAGS:1:${#LDFLAGS}-2}"
347 return 0
348}
349
350etexec-flags() {
351 # if your not using a hardened compiler you wont need this
352 # PIC/no-pic kludge in the first place.
353 has_hardened || return
354
355 has_pie || has_pic
356 if [ $? == 0 ] ; then
357 [ -z "`is-flag -fno-pic`" ] &&
358 export CFLAGS="${CFLAGS} `test_flag -fno-pic`"
359
360 [ -z "`is-flag -nopie`" ] &&
361 export CFLAGS="${CFLAGS} `test_flag -nopie`"
362 fi
363}
364
365fstack-flags() {
366 has_ssp
367 if [ $? == 0 ] ; then
368 [ -z "`is-flag -fno-stack-protector`" ] &&
369 export CFLAGS="${CFLAGS} `test_flag -fno-stack-protector`"
370 fi
371}

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