/[gentoo-x86]/eclass/flag-o-matic.eclass
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Revision 1.3 Revision 1.36
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 1.36 2004/02/21 07:07:56 vapier 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 $ECLASS"
6 9
7# 10#
8#### filter-flags <flag> #### 11#### filter-flags <flags> ####
9# Remove particular flags from C[XX]FLAGS 12# Remove particular flags from C[XX]FLAGS
13# Matches only complete flags
10# 14#
11#### append-flags <flag> #### 15#### append-flags <flags> ####
12# Add extra flags to your current C[XX]FLAGS 16# Add extra flags to your current C[XX]FLAGS
13# 17#
14#### change-flags <orig.flag> <new.flag> ### 18#### replace-flags <orig.flag> <new.flag> ###
15# Replace a flag by another one 19# Replace a flag by another one
16# 20#
21#### is-flag <flag> ####
22# Returns "true" if flag is set in C[XX]FLAGS
23# Matches only complete a flag
24#
25#### strip-flags ####
26# Strip C[XX]FLAGS of everything except known
27# good options.
28#
29#### strip-unsupported-flags ####
30# Strip C[XX]FLAGS of any flags not supported by
31# installed version of gcc
32#
33#### get-flag <flag> ####
34# Find and echo the value for a particular flag
35#
36#### replace-sparc64-flags ####
37# Sets mcpu to v8 and uses the original value
38# as mtune if none specified.
39#
40#### filter-mfpmath <math types> ####
41# Remove specified math types from the fpmath specification
42# If the user has -mfpmath=sse,386, running `filter-mfpmath sse`
43# will leave the user with -mfpmath=386
44#
45#### append-ldflags ####
46# Add extra flags to your current LDFLAGS
47#
48#### etexec-flags ####
49# hooked function for hardened-gcc that appends
50# -yet_exec {C,CXX,LD}FLAGS when hardened-gcc is installed
51# and a package is filtering -fPIC,-fpic, -fPIE, -fpie
52#
53#### fstack-flags ####
54# hooked function for hardened-gcc that appends
55# -yno_propolice to {C,CXX,LD}FLAGS when hardened-gcc is installed
56# and a package is filtering -fstack-protector, -fstack-protector-all
57#
17 58
59# C[XX]FLAGS that we allow in strip-flags
60setup-allowed-flags() {
61 export ALLOWED_FLAGS="-O -O1 -O2 -mcpu -march -mtune -fstack-protector -pipe -g"
62 case "${ARCH}" in
63 mips) ALLOWED_FLAGS="${ALLOWED_FLAGS} -mips1 -mips2 -mips3 -mips4 -mabi" ;;
64 amd64) ALLOWED_FLAGS="${ALLOWED_FLAGS} -fPIC" ;;
65 alpha) ALLOWED_FLAGS="${ALLOWED_FLAGS} -fPIC" ;;
66 ia64) ALLOWED_FLAGS="${ALLOWED_FLAGS} -fPIC" ;;
67 esac
18 68
69 # C[XX]FLAGS that we are think is ok, but needs testing
70 # NOTE: currently -Os have issues with gcc3 and K6* arch's
71 export UNSTABLE_FLAGS="-Os -O3 -freorder-blocks -fprefetch-loop-arrays"
72 return 0
73}
74
19filter-flags () { 75filter-flags() {
20
21 for x in $1; do 76 for x in "$@" ; do
77 case "${x}" in
78 -fPIC|-fpic|-fPIE|-fpie) etexec-flags;;
79 -fstack-protector|-fstack-protector-all) fstack-flags;;
80 *) ;;
81 esac
82 done
83
84 # we do this fancy spacing stuff so as to not filter
85 # out part of a flag ... we want flag atoms ! :D
86 CFLAGS=" ${CFLAGS} "
87 CXXFLAGS=" ${CXXFLAGS} "
88 for x in "$@" ; do
22 CFLAGS="${CFLAGS/$x}" 89 CFLAGS="${CFLAGS/ ${x} / }"
23 CXXFLAGS="${CXXFLAGS/$x}" 90 CXXFLAGS="${CXXFLAGS/ ${x} / }"
24 done 91 done
25 92 CFLAGS="${CFLAGS:1:${#CFLAGS}-2}"
93 CXXFLAGS="${CXXFLAGS:1:${#CXXFLAGS}-2}"
94 return 0
26} 95}
27 96
28append-flags () { 97append-flags() {
98 export CFLAGS="${CFLAGS} $@"
99 export CXXFLAGS="${CXXFLAGS} $@"
100 [ "`is-flag -fno-stack-protector`" -o "`is-flag -fno-stack-protector-all`" ] && fstack-flags
101 return 0
102}
29 103
30 104replace-flags() {
105 # we do this fancy spacing stuff so as to not filter
106 # out part of a flag ... we want flag atoms ! :D
31 CFLAGS="$CFLAGS $1" 107 CFLAGS=" ${CFLAGS} "
32 CXXFLAGS="$CXXFLAGS $1" 108 CXXFLAGS=" ${CXXFLAGS} "
33
34}
35
36change-flags () {
37
38 CFLAGS="${CFLAGS/${1}/${2}" 109 CFLAGS="${CFLAGS/ ${1} / ${2} }"
39 CXXFLAGS="${CXXFLAGS/${1}/${2}" 110 CXXFLAGS="${CXXFLAGS/ ${1} / ${2} }"
40 111 CFLAGS="${CFLAGS:1:${#CFLAGS}-2}"
112 CXXFLAGS="${CXXFLAGS:1:${#CXXFLAGS}-2}"
113 return 0
41} 114}
115
116is-flag() {
117 for x in ${CFLAGS} ${CXXFLAGS} ; do
118 if [ "${x}" == "$1" ] ; then
119 echo true
120 return 0
121 fi
122 done
123 return 1
124}
125
126filter-mfpmath() {
127 # save the original -mfpmath flag
128 local orig_mfpmath="`get-flag -mfpmath`"
129 # get the value of the current -mfpmath flag
130 local new_math=" `get-flag mfpmath | tr , ' '` "
131 # figure out which math values are to be removed
132 local prune_math=""
133 for prune_math in "$@" ; do
134 new_math="${new_math/ ${prune_math} / }"
135 done
136 new_math="`echo ${new_math:1:${#new_math}-2} | tr ' ' ,`"
137
138 if [ -z "${new_math}" ] ; then
139 # if we're removing all user specified math values are
140 # slated for removal, then we just filter the flag
141 filter-flags ${orig_mfpmath}
142 else
143 # if we only want to filter some of the user specified
144 # math values, then we replace the current flag
145 replace-flags ${orig_mfpmath} -mfpmath=${new_math}
146 fi
147 return 0
148}
149
150strip-flags() {
151 setup-allowed-flags
152
153 local NEW_CFLAGS=""
154 local NEW_CXXFLAGS=""
155
156 # Allow unstable C[XX]FLAGS if we are using unstable profile ...
157 if [ `has ~${ARCH} ${ACCEPT_KEYWORDS}` ] ; then
158 [ `use debug` ] && einfo "Enabling the use of some unstable flags"
159 ALLOWED_FLAGS="${ALLOWED_FLAGS} ${UNSTABLE_FLAGS}"
160 fi
161
162 set -f
163
164 for x in ${CFLAGS}
165 do
166 for y in ${ALLOWED_FLAGS}
167 do
168 flag=${x%%=*}
169 if [ "${flag%%${y}}" = "" ]
170 then
171 NEW_CFLAGS="${NEW_CFLAGS} ${x}"
172 break
173 fi
174 done
175 done
176
177 for x in ${CXXFLAGS}
178 do
179 for y in ${ALLOWED_FLAGS}
180 do
181 flag=${x%%=*}
182 if [ "${flag%%${y}}" = "" ]
183 then
184 NEW_CXXFLAGS="${NEW_CXXFLAGS} ${x}"
185 break
186 fi
187 done
188 done
189
190 # In case we filtered out all optimization flags fallback to -O2
191 if [ "${CFLAGS/-O}" != "${CFLAGS}" -a "${NEW_CFLAGS/-O}" = "${NEW_CFLAGS}" ]; then
192 NEW_CFLAGS="${NEW_CFLAGS} -O2"
193 fi
194 if [ "${CXXFLAGS/-O}" != "${CXXFLAGS}" -a "${NEW_CXXFLAGS/-O}" = "${NEW_CXXFLAGS}" ]; then
195 NEW_CXXFLAGS="${NEW_CXXFLAGS} -O2"
196 fi
197
198 set +f
199
200 [ `use debug` ] \
201 && einfo "CFLAGS=\"${NEW_CFLAGS}\"" \
202 && einfo "CXXFLAGS=\"${NEW_CXXFLAGS}\""
203
204 export CFLAGS="${NEW_CFLAGS}"
205 export CXXFLAGS="${NEW_CXXFLAGS}"
206 return 0
207}
208
209test_flag() {
210 if gcc -S -xc "$@" -o /dev/null /dev/null >/dev/null 2>&1; then
211 echo "$@"
212 return 0
213 fi
214 return 1
215}
216
217strip-unsupported-flags() {
218 for x in ${CFLAGS} ; do
219 NEW_CFLAGS=${NEW_CFLAGS}" ""`test_flag ${x}`"
220 done
221 for x in ${CXXFLAGS} ; do
222 NEW_CXXFLAGS=${NEW_CXXFLAGS}" ""`test_flag ${x}`"
223 done
224
225 export CFLAGS="${NEW_CFLAGS}"
226 export CXXFLAGS="${NEW_CXXFLAGS}"
227}
228
229get-flag() {
230 # this code looks a little flaky but seems to work for
231 # everything we want ...
232 # for example, if CFLAGS="-march=i686":
233 # `get-flags -march` == "-march=i686"
234 # `get-flags march` == "i686"
235 local findflag="$1"
236 for f in ${CFLAGS} ${CXXFLAGS} ; do
237 if [ "${f/${findflag}}" != "${f}" ] ; then
238 echo "${f/-${findflag}=}"
239 return 0
240 fi
241 done
242 return 1
243}
244
245replace-sparc64-flags() {
246 local SPARC64_CPUS="ultrasparc v9"
247
248 if [ "${CFLAGS/mtune}" != "${CFLAGS}" ]
249 then
250 for x in ${SPARC64_CPUS}
251 do
252 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8}"
253 done
254 else
255 for x in ${SPARC64_CPUS}
256 do
257 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
258 done
259 fi
260
261 if [ "${CXXFLAGS/mtune}" != "${CXXFLAGS}" ]
262 then
263 for x in ${SPARC64_CPUS}
264 do
265 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8}"
266 done
267 else
268 for x in ${SPARC64_CPUS}
269 do
270 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
271 done
272 fi
273}
274
275append-ldflags() {
276 LDFLAGS="${LDFLAGS} $@"
277 return 0
278}
279
280etexec-flags() {
281 has_version sys-devel/hardened-gcc
282 if [ $? == 0 ] ; then
283 if [ "`is-flag -yet_exec`" != "true" ]; then
284 debug-print ">>> appending flags -yet_exec"
285 append-flags -yet_exec
286 append-ldflags -yet_exec
287 fi
288 fi
289}
290
291fstack-flags() {
292 has_version sys-devel/hardened-gcc
293 if [ $? == 0 ] ; then
294 if [ "`is-flag -yno_propolice`" != "true" ]; then
295 debug-print ">>> appending flags -yno_propolice"
296 append-flags -yno_propolice
297 append-ldflags -yno_propolice
298 fi
299 fi
300}

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