/[gentoo-x86]/eclass/flag-o-matic.eclass
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Revision 1.48 - (show annotations) (download)
Thu May 6 02:36:37 2004 UTC (9 years, 11 months ago) by vapier
Branch: MAIN
Changes since 1.47: +5 -1 lines
append-lfs-flags

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 1.47 2004/04/12 02:33:29 swtaylor 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:${#CXXFLAGS}-2}"
104 return 0
105 }
106
107 filter-lfs-flags() {
108 filter-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
109 }
110
111 append-lfs-flags() {
112 append-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
113 }
114
115 append-flags() {
116 export CFLAGS="${CFLAGS} $@"
117 export CXXFLAGS="${CXXFLAGS} $@"
118 [ "`is-flag -fno-stack-protector`" -o "`is-flag -fno-stack-protector-all`" ] && fstack-flags
119 return 0
120 }
121
122 replace-flags() {
123 # we do this fancy spacing stuff so as to not filter
124 # out part of a flag ... we want flag atoms ! :D
125 CFLAGS=" ${CFLAGS} "
126 CXXFLAGS=" ${CXXFLAGS} "
127 CFLAGS="${CFLAGS// ${1} / ${2} }"
128 CXXFLAGS="${CXXFLAGS// ${1} / ${2} }"
129 CFLAGS="${CFLAGS:1:${#CFLAGS}-2}"
130 CXXFLAGS="${CXXFLAGS:1:${#CXXFLAGS}-2}"
131 return 0
132 }
133
134 replace-cpu-flags() {
135 local newcpu="$1" ; shift
136 local oldcpu=""
137 for oldcpu in "$@" ; do
138 replace-flags -march=${oldcpu} -march=${newcpu}
139 replace-flags -mcpu=${oldcpu} -mcpu=${newcpu}
140 replace-flags -mtune=${oldcpu} -mtune=${newcpu}
141 done
142 return 0
143 }
144
145 is-flag() {
146 for x in ${CFLAGS} ${CXXFLAGS} ; do
147 if [ "${x}" == "$1" ] ; then
148 echo true
149 return 0
150 fi
151 done
152 return 1
153 }
154
155 filter-mfpmath() {
156 # save the original -mfpmath flag
157 local orig_mfpmath="`get-flag -mfpmath`"
158 # get the value of the current -mfpmath flag
159 local new_math=" `get-flag mfpmath | tr , ' '` "
160 # figure out which math values are to be removed
161 local prune_math=""
162 for prune_math in "$@" ; do
163 new_math="${new_math/ ${prune_math} / }"
164 done
165 new_math="`echo ${new_math:1:${#new_math}-2} | tr ' ' ,`"
166
167 if [ -z "${new_math}" ] ; then
168 # if we're removing all user specified math values are
169 # slated for removal, then we just filter the flag
170 filter-flags ${orig_mfpmath}
171 else
172 # if we only want to filter some of the user specified
173 # math values, then we replace the current flag
174 replace-flags ${orig_mfpmath} -mfpmath=${new_math}
175 fi
176 return 0
177 }
178
179 strip-flags() {
180 setup-allowed-flags
181
182 local NEW_CFLAGS=""
183 local NEW_CXXFLAGS=""
184
185 # Allow unstable C[XX]FLAGS if we are using unstable profile ...
186 if [ `has ~${ARCH} ${ACCEPT_KEYWORDS}` ] ; then
187 [ `use debug` ] && einfo "Enabling the use of some unstable flags"
188 ALLOWED_FLAGS="${ALLOWED_FLAGS} ${UNSTABLE_FLAGS}"
189 fi
190
191 set -f
192
193 for x in ${CFLAGS}
194 do
195 for y in ${ALLOWED_FLAGS}
196 do
197 flag=${x%%=*}
198 if [ "${flag%%${y}}" = "" ]
199 then
200 NEW_CFLAGS="${NEW_CFLAGS} ${x}"
201 break
202 fi
203 done
204 done
205
206 for x in ${CXXFLAGS}
207 do
208 for y in ${ALLOWED_FLAGS}
209 do
210 flag=${x%%=*}
211 if [ "${flag%%${y}}" = "" ]
212 then
213 NEW_CXXFLAGS="${NEW_CXXFLAGS} ${x}"
214 break
215 fi
216 done
217 done
218
219 # In case we filtered out all optimization flags fallback to -O2
220 if [ "${CFLAGS/-O}" != "${CFLAGS}" -a "${NEW_CFLAGS/-O}" = "${NEW_CFLAGS}" ]; then
221 NEW_CFLAGS="${NEW_CFLAGS} -O2"
222 fi
223 if [ "${CXXFLAGS/-O}" != "${CXXFLAGS}" -a "${NEW_CXXFLAGS/-O}" = "${NEW_CXXFLAGS}" ]; then
224 NEW_CXXFLAGS="${NEW_CXXFLAGS} -O2"
225 fi
226
227 set +f
228
229 [ `use debug` ] \
230 && einfo "CFLAGS=\"${NEW_CFLAGS}\"" \
231 && einfo "CXXFLAGS=\"${NEW_CXXFLAGS}\""
232
233 export CFLAGS="${NEW_CFLAGS}"
234 export CXXFLAGS="${NEW_CXXFLAGS}"
235 return 0
236 }
237
238 test_flag() {
239 if [ -z "`gcc -S -xc "$@" -o /dev/null /dev/null 2>&1`" ]; then
240 echo "$@"
241 return 0
242 fi
243 return 1
244 }
245
246 strip-unsupported-flags() {
247 for x in ${CFLAGS} ; do
248 NEW_CFLAGS=${NEW_CFLAGS}" ""`test_flag ${x}`"
249 done
250 for x in ${CXXFLAGS} ; do
251 NEW_CXXFLAGS=${NEW_CXXFLAGS}" ""`test_flag ${x}`"
252 done
253
254 export CFLAGS="${NEW_CFLAGS}"
255 export CXXFLAGS="${NEW_CXXFLAGS}"
256 }
257
258 get-flag() {
259 # this code looks a little flaky but seems to work for
260 # everything we want ...
261 # for example, if CFLAGS="-march=i686":
262 # `get-flags -march` == "-march=i686"
263 # `get-flags march` == "i686"
264 local findflag="$1"
265 for f in ${CFLAGS} ${CXXFLAGS} ; do
266 if [ "${f/${findflag}}" != "${f}" ] ; then
267 echo "${f/-${findflag}=}"
268 return 0
269 fi
270 done
271 return 1
272 }
273
274 has_pic() {
275 [ "${CFLAGS/-fPIC}" != "${CFLAGS}" ] && return 0
276 [ "${CFLAGS/-fpic}" != "${CFLAGS}" ] && return 0
277 has_version sys-devel/hardened-gcc && return 0
278 [ ! -z "`${CC/ .*/} --version| grep pie`" ] && return 0
279 return 1
280 }
281
282 has_pie() {
283 [ "${CFLAGS/-fPIE}" != "${CFLAGS}" ] && return 0
284 [ "${CFLAGS/-fpie}" != "${CFLAGS}" ] && return 0
285 has_version sys-devel/hardened-gcc && return 0
286 [ ! -z "`${CC/ .*/} --version| grep pie`" ] && return 0
287 return 1
288 }
289
290 has_ssp() {
291 [ "${CFLAGS/-fstack-protector}" != "${CFLAGS}" ] && return 0
292 has_version sys-devel/hardened-gcc && return 0
293 [ ! -z "`${CC/ .*/} --version| grep ssp`" ] && return 0
294 return 1
295 }
296
297 replace-sparc64-flags() {
298 local SPARC64_CPUS="ultrasparc v9"
299
300 if [ "${CFLAGS/mtune}" != "${CFLAGS}" ]
301 then
302 for x in ${SPARC64_CPUS}
303 do
304 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8}"
305 done
306 else
307 for x in ${SPARC64_CPUS}
308 do
309 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
310 done
311 fi
312
313 if [ "${CXXFLAGS/mtune}" != "${CXXFLAGS}" ]
314 then
315 for x in ${SPARC64_CPUS}
316 do
317 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8}"
318 done
319 else
320 for x in ${SPARC64_CPUS}
321 do
322 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
323 done
324 fi
325 }
326
327 append-ldflags() {
328 LDFLAGS="${LDFLAGS} $@"
329 return 0
330 }
331
332 filter-ldflags() {
333 # we do this fancy spacing stuff so as to not filter
334 # out part of a flag ... we want flag atoms ! :D
335 LDFLAGS=" ${LDFLAGS} "
336 for x in "$@" ; do
337 LDFLAGS="${LDFLAGS// ${x} / }"
338 done
339 LDFLAGS="${LDFLAGS:1:${#LDFLAGS}-2}"
340 return 0
341 }
342
343 etexec-flags() {
344 has_pie || has_pic
345 if [ $? == 0 ] ; then
346 [ -z "`is-flag -yet_exec`" ] &&
347 export CFLAGS="${CFLAGS} `test_flag -yet_exec`"
348 [ -z "`is-flag -nopie`" ] &&
349 export CFLAGS="${CFLAGS} `test_flag -nopie`"
350 fi
351 }
352
353 fstack-flags() {
354 has_ssp
355 if [ $? == 0 ] ; then
356 [ -z "`is-flag -yno_propolice`" ] &&
357 export CFLAGS="${CFLAGS} `test_flag -fno-stack-protector`"
358 fi
359 }

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