/[gentoo-x86]/eclass/flag-o-matic.eclass
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Revision 1.44 - (show annotations) (download)
Thu Apr 8 21:53:15 2004 UTC (10 years, 7 months ago) by vapier
Branch: MAIN
Changes since 1.43: +10 -8 lines
allow $ALLOWED_FLAGS to be overridden in ebuilds #47140

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 1.43 2004/04/06 04:25:16 tseng Exp $
4 #
5 # Author Bart Verwilst <verwilst@gentoo.org>
6
7 ECLASS=flag-o-matic
8 INHERITED="$INHERITED $ECLASS"
9
10 #
11 #### filter-flags <flags> ####
12 # Remove particular flags from C[XX]FLAGS
13 # Matches only complete flags
14 #
15 #### append-flags <flags> ####
16 # Add extra flags to your current C[XX]FLAGS
17 #
18 #### replace-flags <orig.flag> <new.flag> ###
19 # Replace a flag by another one
20 #
21 #### replace-cpu-flags <new.cpu> <old.cpus> ###
22 # Replace march/mcpu flags that specify <old.cpus>
23 # with flags that specify <new.cpu>
24 #
25 #### is-flag <flag> ####
26 # Returns "true" if flag is set in C[XX]FLAGS
27 # Matches only complete a flag
28 #
29 #### strip-flags ####
30 # Strip C[XX]FLAGS of everything except known
31 # good options.
32 #
33 #### strip-unsupported-flags ####
34 # Strip C[XX]FLAGS of any flags not supported by
35 # installed version of gcc
36 #
37 #### get-flag <flag> ####
38 # Find and echo the value for a particular flag
39 #
40 #### replace-sparc64-flags ####
41 # Sets mcpu to v8 and uses the original value
42 # as mtune if none specified.
43 #
44 #### filter-mfpmath <math types> ####
45 # Remove specified math types from the fpmath specification
46 # If the user has -mfpmath=sse,386, running `filter-mfpmath sse`
47 # will leave the user with -mfpmath=386
48 #
49 #### append-ldflags ####
50 # Add extra flags to your current LDFLAGS
51 #
52 #### filter-ldflags <flags> ####
53 # Remove particular flags from LDFLAGS
54 # Matches only complete flags
55 #
56 #### etexec-flags ####
57 # hooked function for hardened-gcc that appends
58 # -yet_exec {C,CXX,LD}FLAGS when hardened-gcc is installed
59 # and a package is filtering -fPIC,-fpic, -fPIE, -fpie
60 #
61 #### fstack-flags ####
62 # hooked function for hardened-gcc that appends
63 # -yno_propolice to {C,CXX,LD}FLAGS when hardened-gcc is installed
64 # and a package is filtering -fstack-protector, -fstack-protector-all
65 #
66
67 # C[XX]FLAGS that we allow in strip-flags
68 setup-allowed-flags() {
69 if [ -z "${ALLOWED_FLAGS}" ] ; then
70 export ALLOWED_FLAGS="-O -O1 -O2 -mcpu -march -mtune -fstack-protector -pipe -g"
71 case "${ARCH}" in
72 mips) ALLOWED_FLAGS="${ALLOWED_FLAGS} -mips1 -mips2 -mips3 -mips4 -mabi" ;;
73 amd64) ALLOWED_FLAGS="${ALLOWED_FLAGS} -fPIC" ;;
74 alpha) ALLOWED_FLAGS="${ALLOWED_FLAGS} -fPIC" ;;
75 ia64) ALLOWED_FLAGS="${ALLOWED_FLAGS} -fPIC" ;;
76 esac
77 fi
78
79 # C[XX]FLAGS that we are think is ok, but needs testing
80 # NOTE: currently -Os have issues with gcc3 and K6* arch's
81 export UNSTABLE_FLAGS="-Os -O3 -freorder-blocks -fprefetch-loop-arrays"
82 return 0
83 }
84
85 filter-flags() {
86 for x in "$@" ; do
87 case "${x}" in
88 -fPIC|-fpic|-fPIE|-fpie|-pie) etexec-flags;;
89 -fstack-protector|-fstack-protector-all) fstack-flags;;
90 *) ;;
91 esac
92 done
93
94 # we do this fancy spacing stuff so as to not filter
95 # out part of a flag ... we want flag atoms ! :D
96 CFLAGS=" ${CFLAGS} "
97 CXXFLAGS=" ${CXXFLAGS} "
98 for x in "$@" ; do
99 CFLAGS="${CFLAGS// ${x} / }"
100 CXXFLAGS="${CXXFLAGS// ${x} / }"
101 done
102 CFLAGS="${CFLAGS:1:${#CFLAGS}-2}"
103 CXXFLAGS="${CXXFLAGS:1:${#CXXFLAGS}-2}"
104 return 0
105 }
106
107 filter-lfs-flags() {
108 filter-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
109 }
110
111 append-flags() {
112 export CFLAGS="${CFLAGS} $@"
113 export CXXFLAGS="${CXXFLAGS} $@"
114 [ "`is-flag -fno-stack-protector`" -o "`is-flag -fno-stack-protector-all`" ] && fstack-flags
115 return 0
116 }
117
118 replace-flags() {
119 # we do this fancy spacing stuff so as to not filter
120 # out part of a flag ... we want flag atoms ! :D
121 CFLAGS=" ${CFLAGS} "
122 CXXFLAGS=" ${CXXFLAGS} "
123 CFLAGS="${CFLAGS// ${1} / ${2} }"
124 CXXFLAGS="${CXXFLAGS// ${1} / ${2} }"
125 CFLAGS="${CFLAGS:1:${#CFLAGS}-2}"
126 CXXFLAGS="${CXXFLAGS:1:${#CXXFLAGS}-2}"
127 return 0
128 }
129
130 replace-cpu-flags() {
131 local newcpu="$1" ; shift
132 local oldcpu=""
133 for oldcpu in "$@" ; do
134 replace-flags -march=${oldcpu} -march=${newcpu}
135 replace-flags -mcpu=${oldcpu} -mcpu=${newcpu}
136 replace-flags -mtune=${oldcpu} -mtune=${newcpu}
137 done
138 return 0
139 }
140
141 is-flag() {
142 for x in ${CFLAGS} ${CXXFLAGS} ; do
143 if [ "${x}" == "$1" ] ; then
144 echo true
145 return 0
146 fi
147 done
148 return 1
149 }
150
151 filter-mfpmath() {
152 # save the original -mfpmath flag
153 local orig_mfpmath="`get-flag -mfpmath`"
154 # get the value of the current -mfpmath flag
155 local new_math=" `get-flag mfpmath | tr , ' '` "
156 # figure out which math values are to be removed
157 local prune_math=""
158 for prune_math in "$@" ; do
159 new_math="${new_math/ ${prune_math} / }"
160 done
161 new_math="`echo ${new_math:1:${#new_math}-2} | tr ' ' ,`"
162
163 if [ -z "${new_math}" ] ; then
164 # if we're removing all user specified math values are
165 # slated for removal, then we just filter the flag
166 filter-flags ${orig_mfpmath}
167 else
168 # if we only want to filter some of the user specified
169 # math values, then we replace the current flag
170 replace-flags ${orig_mfpmath} -mfpmath=${new_math}
171 fi
172 return 0
173 }
174
175 strip-flags() {
176 setup-allowed-flags
177
178 local NEW_CFLAGS=""
179 local NEW_CXXFLAGS=""
180
181 # Allow unstable C[XX]FLAGS if we are using unstable profile ...
182 if [ `has ~${ARCH} ${ACCEPT_KEYWORDS}` ] ; then
183 [ `use debug` ] && einfo "Enabling the use of some unstable flags"
184 ALLOWED_FLAGS="${ALLOWED_FLAGS} ${UNSTABLE_FLAGS}"
185 fi
186
187 set -f
188
189 for x in ${CFLAGS}
190 do
191 for y in ${ALLOWED_FLAGS}
192 do
193 flag=${x%%=*}
194 if [ "${flag%%${y}}" = "" ]
195 then
196 NEW_CFLAGS="${NEW_CFLAGS} ${x}"
197 break
198 fi
199 done
200 done
201
202 for x in ${CXXFLAGS}
203 do
204 for y in ${ALLOWED_FLAGS}
205 do
206 flag=${x%%=*}
207 if [ "${flag%%${y}}" = "" ]
208 then
209 NEW_CXXFLAGS="${NEW_CXXFLAGS} ${x}"
210 break
211 fi
212 done
213 done
214
215 # In case we filtered out all optimization flags fallback to -O2
216 if [ "${CFLAGS/-O}" != "${CFLAGS}" -a "${NEW_CFLAGS/-O}" = "${NEW_CFLAGS}" ]; then
217 NEW_CFLAGS="${NEW_CFLAGS} -O2"
218 fi
219 if [ "${CXXFLAGS/-O}" != "${CXXFLAGS}" -a "${NEW_CXXFLAGS/-O}" = "${NEW_CXXFLAGS}" ]; then
220 NEW_CXXFLAGS="${NEW_CXXFLAGS} -O2"
221 fi
222
223 set +f
224
225 [ `use debug` ] \
226 && einfo "CFLAGS=\"${NEW_CFLAGS}\"" \
227 && einfo "CXXFLAGS=\"${NEW_CXXFLAGS}\""
228
229 export CFLAGS="${NEW_CFLAGS}"
230 export CXXFLAGS="${NEW_CXXFLAGS}"
231 return 0
232 }
233
234 test_flag() {
235 if gcc -S -xc "$@" -o /dev/null /dev/null >/dev/null 2>&1; then
236 echo "$@"
237 return 0
238 fi
239 return 1
240 }
241
242 strip-unsupported-flags() {
243 for x in ${CFLAGS} ; do
244 NEW_CFLAGS=${NEW_CFLAGS}" ""`test_flag ${x}`"
245 done
246 for x in ${CXXFLAGS} ; do
247 NEW_CXXFLAGS=${NEW_CXXFLAGS}" ""`test_flag ${x}`"
248 done
249
250 export CFLAGS="${NEW_CFLAGS}"
251 export CXXFLAGS="${NEW_CXXFLAGS}"
252 }
253
254 get-flag() {
255 # this code looks a little flaky but seems to work for
256 # everything we want ...
257 # for example, if CFLAGS="-march=i686":
258 # `get-flags -march` == "-march=i686"
259 # `get-flags march` == "i686"
260 local findflag="$1"
261 for f in ${CFLAGS} ${CXXFLAGS} ; do
262 if [ "${f/${findflag}}" != "${f}" ] ; then
263 echo "${f/-${findflag}=}"
264 return 0
265 fi
266 done
267 return 1
268 }
269
270 has_pic() {
271 [ "${CFLAGS/-fPIC}" != "${CFLAGS}" ] && return 0
272 [ "${CFLAGS/-fpic}" != "${CFLAGS}" ] && return 0
273 [ has_version sys-devel/hardened-gcc ] && return 0
274 [ ! -z "`${CC/ .*/} --version| grep pie`" ] && return 0
275 return 1
276 }
277
278 has_pie() {
279 [ "${CFLAGS/-fPIE}" != "${CFLAGS}" ] && return 0
280 [ "${CFLAGS/-fpie}" != "${CFLAGS}" ] && return 0
281 [ has_version sys-devel/hardened-gcc ] && return 0
282 [ ! -z "`${CC/ .*/} --version| grep pie`" ] && return 0
283 return 1
284 }
285
286 has_ssp() {
287 [ "${CFLAGS/-fstack-protector}" != "${CFLAGS}" ] && return 0
288 [ has_version sys-devel/hardened-gcc ] && return 0
289 [ ! -z "`${CC/ .*/} --version| grep ssp`" ] && return 0
290 return 1
291 }
292
293 replace-sparc64-flags() {
294 local SPARC64_CPUS="ultrasparc v9"
295
296 if [ "${CFLAGS/mtune}" != "${CFLAGS}" ]
297 then
298 for x in ${SPARC64_CPUS}
299 do
300 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8}"
301 done
302 else
303 for x in ${SPARC64_CPUS}
304 do
305 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
306 done
307 fi
308
309 if [ "${CXXFLAGS/mtune}" != "${CXXFLAGS}" ]
310 then
311 for x in ${SPARC64_CPUS}
312 do
313 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8}"
314 done
315 else
316 for x in ${SPARC64_CPUS}
317 do
318 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
319 done
320 fi
321 }
322
323 append-ldflags() {
324 LDFLAGS="${LDFLAGS} $@"
325 return 0
326 }
327
328 filter-ldflags() {
329 # we do this fancy spacing stuff so as to not filter
330 # out part of a flag ... we want flag atoms ! :D
331 LDFLAGS=" ${LDFLAGS} "
332 for x in "$@" ; do
333 LDFLAGS="${LDFLAGS// ${x} / }"
334 done
335 LDFLAGS="${LDFLAGS:1:${#LDFLAGS}-2}"
336 return 0
337 }
338
339 etexec-flags() {
340 has_pie || has_pic
341 if [ $? == 0 ] ; then
342 # strip -fPIC regardless if you've gotten this far
343 strip-flags -fPIC -fpic -fPIE -fpie -pie
344 if [ "`is-flag -yet_exec`" != "true" ]; then
345 # If our compile support -yet_exec, append it now
346 [ -z "`gcc -yet_exec -S -o /dev/null -xc /dev/null 2>&1`" ] \
347 && ( debug-print ">>> appending flags -yet_exec" ; \
348 append-flags -yet_exec ; append-ldflags -yet_exec )
349 fi
350 fi
351 }
352
353 fstack-flags() {
354 has_ssp
355 if [ $? == 0 ] ; then
356 # strip -fstack-protector regardless if you've gotten this far
357 strip-flags -fstack-protector -fstack-protector-all
358 if [ "`is-flag -yno_propolice`" != "true" ]; then
359 # If our compile support -yno_propolice, append it now
360 [ -z "`gcc -yno_propolice -S -o /dev/null -xc /dev/null 2>&1`" ] \
361 && ( debug-print ">>> appending flags -yno_propolice" ; \
362 append-flags -yno_propolice ; append-ldflags -yno_propolice )
363 fi
364 fi
365 }

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