/[gentoo-x86]/eclass/flag-o-matic.eclass
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Revision 1.37 - (show annotations) (download)
Sat Feb 21 07:19:29 2004 UTC (10 years, 10 months ago) by vapier
Branch: MAIN
Changes since 1.36: +19 -5 lines
add replace-cpu-flags to help tone down march/mcpu flags
make sure filter-flags/replace-flags catch multiple copies of a flag (for example, if user has -msse -msse -msse and we try to `filter-flags -msse`, we would catch only the first one before)

1 # Copyright 1999-2003 Gentoo Technologies, Inc.
2 # Distributed under the terms of the GNU General Public License v2
3 # $Header: /home/cvsroot/gentoo-x86/eclass/flag-o-matic.eclass,v 1.36 2004/02/21 07:07:56 vapier Exp $
4 #
5 # Author Bart Verwilst <verwilst@gentoo.org>
6
7 ECLASS=flag-o-matic
8 INHERITED="$INHERITED $ECLASS"
9
10 #
11 #### filter-flags <flags> ####
12 # Remove particular flags from C[XX]FLAGS
13 # Matches only complete flags
14 #
15 #### append-flags <flags> ####
16 # Add extra flags to your current C[XX]FLAGS
17 #
18 #### replace-flags <orig.flag> <new.flag> ###
19 # Replace a flag by another one
20 #
21 #### replace-cpu-flags <new.cpu> <old.cpus> ###
22 # Replace march/mcpu flags that specify <old.cpus>
23 # with flags that specify <new.cpu>
24 #
25 #### is-flag <flag> ####
26 # Returns "true" if flag is set in C[XX]FLAGS
27 # Matches only complete a flag
28 #
29 #### strip-flags ####
30 # Strip C[XX]FLAGS of everything except known
31 # good options.
32 #
33 #### strip-unsupported-flags ####
34 # Strip C[XX]FLAGS of any flags not supported by
35 # installed version of gcc
36 #
37 #### get-flag <flag> ####
38 # Find and echo the value for a particular flag
39 #
40 #### replace-sparc64-flags ####
41 # Sets mcpu to v8 and uses the original value
42 # as mtune if none specified.
43 #
44 #### filter-mfpmath <math types> ####
45 # Remove specified math types from the fpmath specification
46 # If the user has -mfpmath=sse,386, running `filter-mfpmath sse`
47 # will leave the user with -mfpmath=386
48 #
49 #### append-ldflags ####
50 # Add extra flags to your current LDFLAGS
51 #
52 #### etexec-flags ####
53 # hooked function for hardened-gcc that appends
54 # -yet_exec {C,CXX,LD}FLAGS when hardened-gcc is installed
55 # and a package is filtering -fPIC,-fpic, -fPIE, -fpie
56 #
57 #### fstack-flags ####
58 # hooked function for hardened-gcc that appends
59 # -yno_propolice to {C,CXX,LD}FLAGS when hardened-gcc is installed
60 # and a package is filtering -fstack-protector, -fstack-protector-all
61 #
62
63 # C[XX]FLAGS that we allow in strip-flags
64 setup-allowed-flags() {
65 export ALLOWED_FLAGS="-O -O1 -O2 -mcpu -march -mtune -fstack-protector -pipe -g"
66 case "${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
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
79 filter-flags() {
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
93 CFLAGS="${CFLAGS// ${x} / }"
94 CXXFLAGS="${CXXFLAGS// ${x} / }"
95 done
96 CFLAGS="${CFLAGS:1:${#CFLAGS}-2}"
97 CXXFLAGS="${CXXFLAGS:1:${#CXXFLAGS}-2}"
98 return 0
99 }
100
101 append-flags() {
102 export CFLAGS="${CFLAGS} $@"
103 export CXXFLAGS="${CXXFLAGS} $@"
104 [ "`is-flag -fno-stack-protector`" -o "`is-flag -fno-stack-protector-all`" ] && fstack-flags
105 return 0
106 }
107
108 replace-flags() {
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=" ${CXXFLAGS} "
113 CFLAGS="${CFLAGS// ${1} / ${2} }"
114 CXXFLAGS="${CXXFLAGS// ${1} / ${2} }"
115 CFLAGS="${CFLAGS:1:${#CFLAGS}-2}"
116 CXXFLAGS="${CXXFLAGS:1:${#CXXFLAGS}-2}"
117 return 0
118 }
119
120 replace-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
130 is-flag() {
131 for x in ${CFLAGS} ${CXXFLAGS} ; do
132 if [ "${x}" == "$1" ] ; then
133 echo true
134 return 0
135 fi
136 done
137 return 1
138 }
139
140 filter-mfpmath() {
141 # save the original -mfpmath flag
142 local orig_mfpmath="`get-flag -mfpmath`"
143 # get the value of the current -mfpmath flag
144 local new_math=" `get-flag mfpmath | tr , ' '` "
145 # figure out which math values are to be removed
146 local prune_math=""
147 for prune_math in "$@" ; 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
164 strip-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="${NEW_CXXFLAGS}"
220 return 0
221 }
222
223 test_flag() {
224 if gcc -S -xc "$@" -o /dev/null /dev/null >/dev/null 2>&1; then
225 echo "$@"
226 return 0
227 fi
228 return 1
229 }
230
231 strip-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
243 get-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
259 replace-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
289 append-ldflags() {
290 LDFLAGS="${LDFLAGS} $@"
291 return 0
292 }
293
294 etexec-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
305 fstack-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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