/[gentoo-x86]/eclass/flag-o-matic.eclass
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Revision 1.63 - (show annotations) (download)
Sun Jul 18 04:59:30 2004 UTC (10 years, 1 month ago) by vapier
Branch: MAIN
Changes since 1.62: +5 -4 lines
dont strip out -fno- and -mno- related flags

1 # Copyright 1999-2004 Gentoo Foundation
2 # Distributed under the terms of the GNU General Public License v2
3 # $Header: /var/cvsroot/gentoo-x86/eclass/flag-o-matic.eclass,v 1.62 2004/07/15 04:59:44 lv Exp $
4 #
5 # Author Bart Verwilst <verwilst@gentoo.org>
6
7 ECLASS=flag-o-matic
8 INHERITED="$INHERITED $ECLASS"
9
10 IUSE="debug"
11
12 #
13 #### filter-flags <flags> ####
14 # Remove particular flags from C[XX]FLAGS
15 # Matches only complete flags
16 #
17 #### append-flags <flags> ####
18 # Add extra flags to your current C[XX]FLAGS
19 #
20 #### replace-flags <orig.flag> <new.flag> ###
21 # Replace a flag by another one
22 #
23 #### replace-cpu-flags <new.cpu> <old.cpus> ###
24 # Replace march/mcpu flags that specify <old.cpus>
25 # with flags that specify <new.cpu>
26 #
27 #### is-flag <flag> ####
28 # Returns "true" if flag is set in C[XX]FLAGS
29 # Matches only complete a flag
30 #
31 #### strip-flags ####
32 # Strip C[XX]FLAGS of everything except known
33 # good options.
34 #
35 #### strip-unsupported-flags ####
36 # Strip C[XX]FLAGS of any flags not supported by
37 # installed version of gcc
38 #
39 #### get-flag <flag> ####
40 # Find and echo the value for a particular flag
41 #
42 #### replace-sparc64-flags ####
43 # Sets mcpu to v8 and uses the original value
44 # as mtune if none specified.
45 #
46 #### filter-mfpmath <math types> ####
47 # Remove specified math types from the fpmath specification
48 # If the user has -mfpmath=sse,386, running `filter-mfpmath sse`
49 # will leave the user with -mfpmath=386
50 #
51 #### append-ldflags ####
52 # Add extra flags to your current LDFLAGS
53 #
54 #### filter-ldflags <flags> ####
55 # Remove particular flags from LDFLAGS
56 # Matches only complete flags
57 #
58 #### etexec-flags ####
59 # hooked function for hardened gcc that appends
60 # -fno-pic to {C,CXX,LD}FLAGS
61 # when a package is filtering -fpic, -fPIC, -fpie, -fPIE
62 #
63 #### fstack-flags ####
64 # hooked function for hardened gcc that appends
65 # -fno-stack-protector to {C,CXX,LD}FLAGS
66 # when a package is filtering -fstack-protector, -fstack-protector-all
67 # notice: modern automatic specs files will also suppress -fstack-protector-all
68 # when only -fno-stack-protector is given
69 #
70
71 # C[XX]FLAGS that we allow in strip-flags
72 setup-allowed-flags() {
73 if [ -z "${ALLOWED_FLAGS}" ] ; then
74 export ALLOWED_FLAGS="-O -O1 -O2 -mcpu -march -mtune -fstack-protector -fno-unit-at-a-time -pipe -g"
75 case "${ARCH}" in
76 mips) ALLOWED_FLAGS="${ALLOWED_FLAGS} -mips1 -mips2 -mips3 -mips4 -mabi" ;;
77 amd64) ALLOWED_FLAGS="${ALLOWED_FLAGS} -fPIC -m64" ;;
78 x86) ALLOWED_FLAGS="${ALLOWED_FLAGS} -m32" ;;
79 alpha) ALLOWED_FLAGS="${ALLOWED_FLAGS} -fPIC" ;;
80 ia64) ALLOWED_FLAGS="${ALLOWED_FLAGS} -fPIC" ;;
81 esac
82 fi
83
84 # C[XX]FLAGS that we are think is ok, but needs testing
85 # NOTE: currently -Os have issues with gcc3 and K6* arch's
86 export UNSTABLE_FLAGS="-Os -O3 -freorder-blocks -fprefetch-loop-arrays"
87 return 0
88 }
89
90 filter-flags() {
91 local x f fset
92 declare -a new_CFLAGS new_CXXFLAGS
93
94 for x in "$@" ; do
95 case "${x}" in
96 -fPIC|-fpic|-fPIE|-fpie|-pie) etexec-flags;;
97 -fstack-protector|-fstack-protector-all) fstack-flags;;
98 esac
99 done
100
101 for fset in CFLAGS CXXFLAGS; do
102 for f in ${!fset}; do
103 for x in "$@"; do
104 # Note this should work with globs like -O*
105 [[ ${f} == ${x} ]] && continue 2
106 done
107 eval new_${fset}\[\${\#new_${fset}\[@]}]=\${f}
108 done
109 eval export ${fset}=\${new_${fset}\[*]}
110 done
111
112 return 0
113 }
114
115 filter-lfs-flags() {
116 filter-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
117 }
118
119 append-lfs-flags() {
120 append-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
121 }
122
123 append-flags() {
124 export CFLAGS="${CFLAGS} $*"
125 export CXXFLAGS="${CXXFLAGS} $*"
126 [ -n "`is-flag -fno-stack-protector`" -o \
127 -n "`is-flag -fno-stack-protector-all`" ] && fstack-flags
128 return 0
129 }
130
131 replace-flags() {
132 # we do this fancy spacing stuff so as to not filter
133 # out part of a flag ... we want flag atoms ! :D
134 CFLAGS=" ${CFLAGS} "
135 CXXFLAGS=" ${CXXFLAGS} "
136 CFLAGS="${CFLAGS// ${1} / ${2} }"
137 CXXFLAGS="${CXXFLAGS// ${1} / ${2} }"
138 CFLAGS="${CFLAGS:1:${#CFLAGS}-2}"
139 CXXFLAGS="${CXXFLAGS:1:${#CXXFLAGS}-2}"
140 export CFLAGS CXXFLAGS
141 return 0
142 }
143
144 replace-cpu-flags() {
145 local oldcpu newcpu="$1" ; shift
146 for oldcpu in "$@" ; do
147 replace-flags -march=${oldcpu} -march=${newcpu}
148 replace-flags -mcpu=${oldcpu} -mcpu=${newcpu}
149 replace-flags -mtune=${oldcpu} -mtune=${newcpu}
150 done
151 return 0
152 }
153
154 is-flag() {
155 local x
156
157 for x in ${CFLAGS} ${CXXFLAGS} ; do
158 if [ "${x}" == "$1" ] ; then
159 echo true
160 return 0
161 fi
162 done
163 return 1
164 }
165
166 filter-mfpmath() {
167 local orig_mfpmath new_math prune_math
168
169 # save the original -mfpmath flag
170 orig_mfpmath="`get-flag -mfpmath`"
171 # get the value of the current -mfpmath flag
172 new_math=" `get-flag mfpmath | tr , ' '` "
173 # figure out which math values are to be removed
174 prune_math=""
175 for prune_math in "$@" ; do
176 new_math="${new_math/ ${prune_math} / }"
177 done
178 new_math="`echo ${new_math:1:${#new_math}-2} | tr ' ' ,`"
179
180 if [ -z "${new_math}" ] ; then
181 # if we're removing all user specified math values are
182 # slated for removal, then we just filter the flag
183 filter-flags ${orig_mfpmath}
184 else
185 # if we only want to filter some of the user specified
186 # math values, then we replace the current flag
187 replace-flags ${orig_mfpmath} -mfpmath=${new_math}
188 fi
189 return 0
190 }
191
192 strip-flags() {
193 local x y flag NEW_CFLAGS NEW_CXXFLAGS
194
195 setup-allowed-flags
196
197 local NEW_CFLAGS=""
198 local NEW_CXXFLAGS=""
199
200 # Allow unstable C[XX]FLAGS if we are using unstable profile ...
201 if has ~${ARCH} ${ACCEPT_KEYWORDS} ; then
202 use debug && einfo "Enabling the use of some unstable flags"
203 ALLOWED_FLAGS="${ALLOWED_FLAGS} ${UNSTABLE_FLAGS}"
204 fi
205
206 set -f # disable pathname expansion
207
208 for x in ${CFLAGS}; do
209 for y in ${ALLOWED_FLAGS}; do
210 flag=${x%%=*}
211 if [ "${flag%%${y}}" = "" ] || [ "${flag:0:5}" = "-fno-" ] || [ "${flag:0:5}" = "-mno-" ] ; then
212 NEW_CFLAGS="${NEW_CFLAGS} ${x}"
213 break
214 fi
215 done
216 done
217
218 for x in ${CXXFLAGS}; do
219 for y in ${ALLOWED_FLAGS}; do
220 flag=${x%%=*}
221 if [ "${flag%%${y}}" = "" ] || [ "${flag:0:5}" = "-fno-" ] || [ "${flag:0:5}" = "-mno-" ] ; then
222 NEW_CXXFLAGS="${NEW_CXXFLAGS} ${x}"
223 break
224 fi
225 done
226 done
227
228 # In case we filtered out all optimization flags fallback to -O2
229 if [ "${CFLAGS/-O}" != "${CFLAGS}" -a "${NEW_CFLAGS/-O}" = "${NEW_CFLAGS}" ]; then
230 NEW_CFLAGS="${NEW_CFLAGS} -O2"
231 fi
232 if [ "${CXXFLAGS/-O}" != "${CXXFLAGS}" -a "${NEW_CXXFLAGS/-O}" = "${NEW_CXXFLAGS}" ]; then
233 NEW_CXXFLAGS="${NEW_CXXFLAGS} -O2"
234 fi
235
236 set +f # re-enable pathname expansion
237
238 export CFLAGS="${NEW_CFLAGS}"
239 export CXXFLAGS="${NEW_CXXFLAGS}"
240 return 0
241 }
242
243 test_flag() {
244 local cc=${CC:-gcc} ; cc=${cc%% *}
245 if ${cc} -S -xc "$@" -o /dev/null /dev/null &>/dev/null; then
246 printf "%s\n" "$*"
247 return 0
248 fi
249 return 1
250 }
251
252 test_version_info() {
253 local cc=${CC:-gcc} ; cc=${cc%% *}
254 if [[ $(${cc} --version 2>&1) == *$1* ]]; then
255 return 0
256 else
257 return 1
258 fi
259 }
260
261 strip-unsupported-flags() {
262 local NEW_CFLAGS NEW_CXXFLAGS
263
264 for x in ${CFLAGS} ; do
265 NEW_CFLAGS="${NEW_CFLAGS} `test_flag ${x}`"
266 done
267 for x in ${CXXFLAGS} ; do
268 NEW_CXXFLAGS="${NEW_CXXFLAGS} `test_flag ${x}`"
269 done
270
271 export CFLAGS="${NEW_CFLAGS}"
272 export CXXFLAGS="${NEW_CXXFLAGS}"
273 }
274
275 get-flag() {
276 local f findflag="$1"
277
278 # this code looks a little flaky but seems to work for
279 # everything we want ...
280 # for example, if CFLAGS="-march=i686":
281 # `get-flag -march` == "-march=i686"
282 # `get-flag march` == "i686"
283 for f in ${CFLAGS} ${CXXFLAGS} ; do
284 if [ "${f/${findflag}}" != "${f}" ] ; then
285 printf "%s\n" "${f/-${findflag}=}"
286 return 0
287 fi
288 done
289 return 1
290 }
291
292 has_hardened() {
293 test_version_info Hardened
294 return $?
295 }
296
297 has_pic() {
298 [ "${CFLAGS/-fPIC}" != "${CFLAGS}" ] && return 0
299 [ "${CFLAGS/-fpic}" != "${CFLAGS}" ] && return 0
300 test_version_info pie && return 0
301 return 1
302 }
303
304 has_pie() {
305 [ "${CFLAGS/-fPIE}" != "${CFLAGS}" ] && return 0
306 [ "${CFLAGS/-fpie}" != "${CFLAGS}" ] && return 0
307 test_version_info pie && return 0
308 return 1
309 }
310
311 has_ssp() {
312 [ "${CFLAGS/-fstack-protector}" != "${CFLAGS}" ] && return 0
313 test_version_info ssp && return 0
314 return 1
315 }
316
317 has_m64() {
318 # this doesnt test if the flag is accepted, it tests if the flag
319 # actually -WORKS-. non-multilib gcc will take both -m32 and -m64!
320 # please dont replace this function with test_flag in some future
321 # clean-up!
322 temp=`mktemp`
323 echo "int main() { return(0); }" > ${temp}.c
324 ${CC/ .*/} -m64 -o /dev/null ${temp}.c > /dev/null 2>&1
325 ret=$?
326 rm -f ${temp}.c
327 [ "$ret" != "1" ] && return 0
328 return 1
329 }
330
331 has_m32() {
332 # this doesnt test if the flag is accepted, it tests if the flag
333 # actually -WORKS-. non-multilib gcc will take both -m32 and -m64!
334 # please dont replace this function with test_flag in some future
335 # clean-up!
336 temp=`mktemp`
337 echo "int main() { return(0); }" > ${temp}.c
338 ${CC/ .*/} -m32 -o /dev/null ${temp}.c > /dev/null 2>&1
339 ret=$?
340 rm -f ${temp}.c
341 [ "$ret" != "1" ] && return 0
342 return 1
343 }
344
345 replace-sparc64-flags() {
346 local SPARC64_CPUS="ultrasparc v9"
347
348 if [ "${CFLAGS/mtune}" != "${CFLAGS}" ]; then
349 for x in ${SPARC64_CPUS}; do
350 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8}"
351 done
352 else
353 for x in ${SPARC64_CPUS}; do
354 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
355 done
356 fi
357
358 if [ "${CXXFLAGS/mtune}" != "${CXXFLAGS}" ]; then
359 for x in ${SPARC64_CPUS}; do
360 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8}"
361 done
362 else
363 for x in ${SPARC64_CPUS}; do
364 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
365 done
366 fi
367
368 export CFLAGS CXXFLAGS
369 }
370
371 append-ldflags() {
372 export LDFLAGS="${LDFLAGS} $*"
373 return 0
374 }
375
376 filter-ldflags() {
377 local x
378
379 # we do this fancy spacing stuff so as to not filter
380 # out part of a flag ... we want flag atoms ! :D
381 LDFLAGS=" ${LDFLAGS} "
382 for x in "$@" ; do
383 LDFLAGS="${LDFLAGS// ${x} / }"
384 done
385 LDFLAGS="${LDFLAGS:1:${#LDFLAGS}-2}"
386 export LDFLAGS
387 return 0
388 }
389
390 etexec-flags() {
391 # if you're not using a hardened compiler you wont need this
392 # PIC/no-pic kludge in the first place.
393 has_hardened || return 0
394
395 if has_pie || has_pic; then
396 [ -z "`is-flag -fno-pic`" ] &&
397 export CFLAGS="${CFLAGS} `test_flag -fno-pic`"
398 [ -z "`is-flag -nopie`" ] &&
399 export CFLAGS="${CFLAGS} `test_flag -nopie`"
400 fi
401 return 0
402 }
403
404 fstack-flags() {
405 if has_ssp; then
406 [ -z "`is-flag -fno-stack-protector`" ] &&
407 export CFLAGS="${CFLAGS} `test_flag -fno-stack-protector`"
408 fi
409 return 0
410 }

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