/[gentoo-x86]/eclass/flag-o-matic.eclass
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Revision 1.39 - (show annotations) (download)
Fri Mar 12 05:14:45 2004 UTC (10 years, 6 months ago) by solar
Branch: MAIN
Changes since 1.38: +2 -2 lines
filter -pie along with fpie

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 1.38 2004/02/26 06:47:23 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|-pie) 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 replace-flags -mtune=${oldcpu} -mtune=${newcpu}
127 done
128 return 0
129 }
130
131 is-flag() {
132 for x in ${CFLAGS} ${CXXFLAGS} ; do
133 if [ "${x}" == "$1" ] ; then
134 echo true
135 return 0
136 fi
137 done
138 return 1
139 }
140
141 filter-mfpmath() {
142 # save the original -mfpmath flag
143 local orig_mfpmath="`get-flag -mfpmath`"
144 # get the value of the current -mfpmath flag
145 local new_math=" `get-flag mfpmath | tr , ' '` "
146 # figure out which math values are to be removed
147 local prune_math=""
148 for prune_math in "$@" ; do
149 new_math="${new_math/ ${prune_math} / }"
150 done
151 new_math="`echo ${new_math:1:${#new_math}-2} | tr ' ' ,`"
152
153 if [ -z "${new_math}" ] ; then
154 # if we're removing all user specified math values are
155 # slated for removal, then we just filter the flag
156 filter-flags ${orig_mfpmath}
157 else
158 # if we only want to filter some of the user specified
159 # math values, then we replace the current flag
160 replace-flags ${orig_mfpmath} -mfpmath=${new_math}
161 fi
162 return 0
163 }
164
165 strip-flags() {
166 setup-allowed-flags
167
168 local NEW_CFLAGS=""
169 local NEW_CXXFLAGS=""
170
171 # Allow unstable C[XX]FLAGS if we are using unstable profile ...
172 if [ `has ~${ARCH} ${ACCEPT_KEYWORDS}` ] ; then
173 [ `use debug` ] && einfo "Enabling the use of some unstable flags"
174 ALLOWED_FLAGS="${ALLOWED_FLAGS} ${UNSTABLE_FLAGS}"
175 fi
176
177 set -f
178
179 for x in ${CFLAGS}
180 do
181 for y in ${ALLOWED_FLAGS}
182 do
183 flag=${x%%=*}
184 if [ "${flag%%${y}}" = "" ]
185 then
186 NEW_CFLAGS="${NEW_CFLAGS} ${x}"
187 break
188 fi
189 done
190 done
191
192 for x in ${CXXFLAGS}
193 do
194 for y in ${ALLOWED_FLAGS}
195 do
196 flag=${x%%=*}
197 if [ "${flag%%${y}}" = "" ]
198 then
199 NEW_CXXFLAGS="${NEW_CXXFLAGS} ${x}"
200 break
201 fi
202 done
203 done
204
205 # In case we filtered out all optimization flags fallback to -O2
206 if [ "${CFLAGS/-O}" != "${CFLAGS}" -a "${NEW_CFLAGS/-O}" = "${NEW_CFLAGS}" ]; then
207 NEW_CFLAGS="${NEW_CFLAGS} -O2"
208 fi
209 if [ "${CXXFLAGS/-O}" != "${CXXFLAGS}" -a "${NEW_CXXFLAGS/-O}" = "${NEW_CXXFLAGS}" ]; then
210 NEW_CXXFLAGS="${NEW_CXXFLAGS} -O2"
211 fi
212
213 set +f
214
215 [ `use debug` ] \
216 && einfo "CFLAGS=\"${NEW_CFLAGS}\"" \
217 && einfo "CXXFLAGS=\"${NEW_CXXFLAGS}\""
218
219 export CFLAGS="${NEW_CFLAGS}"
220 export CXXFLAGS="${NEW_CXXFLAGS}"
221 return 0
222 }
223
224 test_flag() {
225 if gcc -S -xc "$@" -o /dev/null /dev/null >/dev/null 2>&1; then
226 echo "$@"
227 return 0
228 fi
229 return 1
230 }
231
232 strip-unsupported-flags() {
233 for x in ${CFLAGS} ; do
234 NEW_CFLAGS=${NEW_CFLAGS}" ""`test_flag ${x}`"
235 done
236 for x in ${CXXFLAGS} ; do
237 NEW_CXXFLAGS=${NEW_CXXFLAGS}" ""`test_flag ${x}`"
238 done
239
240 export CFLAGS="${NEW_CFLAGS}"
241 export CXXFLAGS="${NEW_CXXFLAGS}"
242 }
243
244 get-flag() {
245 # this code looks a little flaky but seems to work for
246 # everything we want ...
247 # for example, if CFLAGS="-march=i686":
248 # `get-flags -march` == "-march=i686"
249 # `get-flags march` == "i686"
250 local findflag="$1"
251 for f in ${CFLAGS} ${CXXFLAGS} ; do
252 if [ "${f/${findflag}}" != "${f}" ] ; then
253 echo "${f/-${findflag}=}"
254 return 0
255 fi
256 done
257 return 1
258 }
259
260 replace-sparc64-flags() {
261 local SPARC64_CPUS="ultrasparc v9"
262
263 if [ "${CFLAGS/mtune}" != "${CFLAGS}" ]
264 then
265 for x in ${SPARC64_CPUS}
266 do
267 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8}"
268 done
269 else
270 for x in ${SPARC64_CPUS}
271 do
272 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
273 done
274 fi
275
276 if [ "${CXXFLAGS/mtune}" != "${CXXFLAGS}" ]
277 then
278 for x in ${SPARC64_CPUS}
279 do
280 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8}"
281 done
282 else
283 for x in ${SPARC64_CPUS}
284 do
285 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
286 done
287 fi
288 }
289
290 append-ldflags() {
291 LDFLAGS="${LDFLAGS} $@"
292 return 0
293 }
294
295 etexec-flags() {
296 has_version sys-devel/hardened-gcc
297 if [ $? == 0 ] ; then
298 if [ "`is-flag -yet_exec`" != "true" ]; then
299 debug-print ">>> appending flags -yet_exec"
300 append-flags -yet_exec
301 append-ldflags -yet_exec
302 fi
303 fi
304 }
305
306 fstack-flags() {
307 has_version sys-devel/hardened-gcc
308 if [ $? == 0 ] ; then
309 if [ "`is-flag -yno_propolice`" != "true" ]; then
310 debug-print ">>> appending flags -yno_propolice"
311 append-flags -yno_propolice
312 append-ldflags -yno_propolice
313 fi
314 fi
315 }

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