/[gentoo-x86]/eclass/flag-o-matic.eclass
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Revision 1.5 Revision 1.37
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 1.37 2004/02/21 07:19:29 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#### replace-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#### replace-cpu-flags <new.cpu> <old.cpus> ###
22# Replace march/mcpu flags that specify <old.cpus>
23# with flags that specify <new.cpu>
24#
25#### is-flag <flag> ####
26# Returns "true" if flag is set in C[XX]FLAGS
27# Matches only complete a flag
28#
29#### strip-flags ####
30# Strip C[XX]FLAGS of everything except known
31# good options.
32#
33#### strip-unsupported-flags ####
34# Strip C[XX]FLAGS of any flags not supported by
35# installed version of gcc
36#
37#### get-flag <flag> ####
38# Find and echo the value for a particular flag
39#
40#### replace-sparc64-flags ####
41# Sets mcpu to v8 and uses the original value
42# as mtune if none specified.
43#
44#### filter-mfpmath <math types> ####
45# Remove specified math types from the fpmath specification
46# If the user has -mfpmath=sse,386, running `filter-mfpmath sse`
47# will leave the user with -mfpmath=386
48#
49#### append-ldflags ####
50# Add extra flags to your current LDFLAGS
51#
52#### etexec-flags ####
53# hooked function for hardened-gcc that appends
54# -yet_exec {C,CXX,LD}FLAGS when hardened-gcc is installed
55# and a package is filtering -fPIC,-fpic, -fPIE, -fpie
56#
57#### fstack-flags ####
58# hooked function for hardened-gcc that appends
59# -yno_propolice to {C,CXX,LD}FLAGS when hardened-gcc is installed
60# and a package is filtering -fstack-protector, -fstack-protector-all
61#
17 62
63# C[XX]FLAGS that we allow in strip-flags
64setup-allowed-flags() {
65 export ALLOWED_FLAGS="-O -O1 -O2 -mcpu -march -mtune -fstack-protector -pipe -g"
66 case "${ARCH}" in
67 mips) ALLOWED_FLAGS="${ALLOWED_FLAGS} -mips1 -mips2 -mips3 -mips4 -mabi" ;;
68 amd64) ALLOWED_FLAGS="${ALLOWED_FLAGS} -fPIC" ;;
69 alpha) ALLOWED_FLAGS="${ALLOWED_FLAGS} -fPIC" ;;
70 ia64) ALLOWED_FLAGS="${ALLOWED_FLAGS} -fPIC" ;;
71 esac
18 72
73 # C[XX]FLAGS that we are think is ok, but needs testing
74 # NOTE: currently -Os have issues with gcc3 and K6* arch's
75 export UNSTABLE_FLAGS="-Os -O3 -freorder-blocks -fprefetch-loop-arrays"
76 return 0
77}
78
19filter-flags () { 79filter-flags() {
20
21 for x in $1; do 80 for x in "$@" ; do
81 case "${x}" in
82 -fPIC|-fpic|-fPIE|-fpie) etexec-flags;;
83 -fstack-protector|-fstack-protector-all) fstack-flags;;
84 *) ;;
85 esac
86 done
87
88 # we do this fancy spacing stuff so as to not filter
89 # out part of a flag ... we want flag atoms ! :D
90 CFLAGS=" ${CFLAGS} "
91 CXXFLAGS=" ${CXXFLAGS} "
92 for x in "$@" ; do
22 CFLAGS="${CFLAGS/$x}" 93 CFLAGS="${CFLAGS// ${x} / }"
23 CXXFLAGS="${CXXFLAGS/$x}" 94 CXXFLAGS="${CXXFLAGS// ${x} / }"
24 done 95 done
25 96 CFLAGS="${CFLAGS:1:${#CFLAGS}-2}"
97 CXXFLAGS="${CXXFLAGS:1:${#CXXFLAGS}-2}"
98 return 0
26} 99}
27 100
28append-flags () { 101append-flags() {
29
30
31 CFLAGS="$CFLAGS $1" 102 export CFLAGS="${CFLAGS} $@"
32 CXXFLAGS="$CXXFLAGS $1" 103 export CXXFLAGS="${CXXFLAGS} $@"
33 104 [ "`is-flag -fno-stack-protector`" -o "`is-flag -fno-stack-protector-all`" ] && fstack-flags
105 return 0
34} 106}
35 107
36replace-flags () { 108replace-flags() {
37 109 # we do this fancy spacing stuff so as to not filter
110 # out part of a flag ... we want flag atoms ! :D
111 CFLAGS=" ${CFLAGS} "
112 CXXFLAGS=" ${CXXFLAGS} "
38 CFLAGS="${CFLAGS/${1}/${2}}" 113 CFLAGS="${CFLAGS// ${1} / ${2} }"
39 CXXFLAGS="${CXXFLAGS/${1}/${2}}" 114 CXXFLAGS="${CXXFLAGS// ${1} / ${2} }"
40 115 CFLAGS="${CFLAGS:1:${#CFLAGS}-2}"
116 CXXFLAGS="${CXXFLAGS:1:${#CXXFLAGS}-2}"
117 return 0
41} 118}
119
120replace-cpu-flags() {
121 local newcpu="$1" ; shift
122 local oldcpu=""
123 for oldcpu in "$@" ; do
124 replace-flags -march=${oldcpu} -march=${newcpu}
125 replace-flags -mcpu=${oldcpu} -mcpu=${newcpu}
126 done
127 return 0
128}
129
130is-flag() {
131 for x in ${CFLAGS} ${CXXFLAGS} ; do
132 if [ "${x}" == "$1" ] ; then
133 echo true
134 return 0
135 fi
136 done
137 return 1
138}
139
140filter-mfpmath() {
141 # save the original -mfpmath flag
142 local orig_mfpmath="`get-flag -mfpmath`"
143 # get the value of the current -mfpmath flag
144 local new_math=" `get-flag mfpmath | tr , ' '` "
145 # figure out which math values are to be removed
146 local prune_math=""
147 for prune_math in "$@" ; do
148 new_math="${new_math/ ${prune_math} / }"
149 done
150 new_math="`echo ${new_math:1:${#new_math}-2} | tr ' ' ,`"
151
152 if [ -z "${new_math}" ] ; then
153 # if we're removing all user specified math values are
154 # slated for removal, then we just filter the flag
155 filter-flags ${orig_mfpmath}
156 else
157 # if we only want to filter some of the user specified
158 # math values, then we replace the current flag
159 replace-flags ${orig_mfpmath} -mfpmath=${new_math}
160 fi
161 return 0
162}
163
164strip-flags() {
165 setup-allowed-flags
166
167 local NEW_CFLAGS=""
168 local NEW_CXXFLAGS=""
169
170 # Allow unstable C[XX]FLAGS if we are using unstable profile ...
171 if [ `has ~${ARCH} ${ACCEPT_KEYWORDS}` ] ; then
172 [ `use debug` ] && einfo "Enabling the use of some unstable flags"
173 ALLOWED_FLAGS="${ALLOWED_FLAGS} ${UNSTABLE_FLAGS}"
174 fi
175
176 set -f
177
178 for x in ${CFLAGS}
179 do
180 for y in ${ALLOWED_FLAGS}
181 do
182 flag=${x%%=*}
183 if [ "${flag%%${y}}" = "" ]
184 then
185 NEW_CFLAGS="${NEW_CFLAGS} ${x}"
186 break
187 fi
188 done
189 done
190
191 for x in ${CXXFLAGS}
192 do
193 for y in ${ALLOWED_FLAGS}
194 do
195 flag=${x%%=*}
196 if [ "${flag%%${y}}" = "" ]
197 then
198 NEW_CXXFLAGS="${NEW_CXXFLAGS} ${x}"
199 break
200 fi
201 done
202 done
203
204 # In case we filtered out all optimization flags fallback to -O2
205 if [ "${CFLAGS/-O}" != "${CFLAGS}" -a "${NEW_CFLAGS/-O}" = "${NEW_CFLAGS}" ]; then
206 NEW_CFLAGS="${NEW_CFLAGS} -O2"
207 fi
208 if [ "${CXXFLAGS/-O}" != "${CXXFLAGS}" -a "${NEW_CXXFLAGS/-O}" = "${NEW_CXXFLAGS}" ]; then
209 NEW_CXXFLAGS="${NEW_CXXFLAGS} -O2"
210 fi
211
212 set +f
213
214 [ `use debug` ] \
215 && einfo "CFLAGS=\"${NEW_CFLAGS}\"" \
216 && einfo "CXXFLAGS=\"${NEW_CXXFLAGS}\""
217
218 export CFLAGS="${NEW_CFLAGS}"
219 export CXXFLAGS="${NEW_CXXFLAGS}"
220 return 0
221}
222
223test_flag() {
224 if gcc -S -xc "$@" -o /dev/null /dev/null >/dev/null 2>&1; then
225 echo "$@"
226 return 0
227 fi
228 return 1
229}
230
231strip-unsupported-flags() {
232 for x in ${CFLAGS} ; do
233 NEW_CFLAGS=${NEW_CFLAGS}" ""`test_flag ${x}`"
234 done
235 for x in ${CXXFLAGS} ; do
236 NEW_CXXFLAGS=${NEW_CXXFLAGS}" ""`test_flag ${x}`"
237 done
238
239 export CFLAGS="${NEW_CFLAGS}"
240 export CXXFLAGS="${NEW_CXXFLAGS}"
241}
242
243get-flag() {
244 # this code looks a little flaky but seems to work for
245 # everything we want ...
246 # for example, if CFLAGS="-march=i686":
247 # `get-flags -march` == "-march=i686"
248 # `get-flags march` == "i686"
249 local findflag="$1"
250 for f in ${CFLAGS} ${CXXFLAGS} ; do
251 if [ "${f/${findflag}}" != "${f}" ] ; then
252 echo "${f/-${findflag}=}"
253 return 0
254 fi
255 done
256 return 1
257}
258
259replace-sparc64-flags() {
260 local SPARC64_CPUS="ultrasparc v9"
261
262 if [ "${CFLAGS/mtune}" != "${CFLAGS}" ]
263 then
264 for x in ${SPARC64_CPUS}
265 do
266 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8}"
267 done
268 else
269 for x in ${SPARC64_CPUS}
270 do
271 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
272 done
273 fi
274
275 if [ "${CXXFLAGS/mtune}" != "${CXXFLAGS}" ]
276 then
277 for x in ${SPARC64_CPUS}
278 do
279 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8}"
280 done
281 else
282 for x in ${SPARC64_CPUS}
283 do
284 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
285 done
286 fi
287}
288
289append-ldflags() {
290 LDFLAGS="${LDFLAGS} $@"
291 return 0
292}
293
294etexec-flags() {
295 has_version sys-devel/hardened-gcc
296 if [ $? == 0 ] ; then
297 if [ "`is-flag -yet_exec`" != "true" ]; then
298 debug-print ">>> appending flags -yet_exec"
299 append-flags -yet_exec
300 append-ldflags -yet_exec
301 fi
302 fi
303}
304
305fstack-flags() {
306 has_version sys-devel/hardened-gcc
307 if [ $? == 0 ] ; then
308 if [ "`is-flag -yno_propolice`" != "true" ]; then
309 debug-print ">>> appending flags -yno_propolice"
310 append-flags -yno_propolice
311 append-ldflags -yno_propolice
312 fi
313 fi
314}
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