/[gentoo-x86]/eclass/flag-o-matic.eclass
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Revision 1.70 - (show annotations) (download)
Sat Sep 25 07:37:19 2004 UTC (10 years ago) by vapier
Branch: MAIN
Changes since 1.69: +8 -7 lines
reverse parameter order of replace-cpu-flags #60597

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 1.69 2004/09/14 02:06:36 lv Exp $
4 #
5 # Author Bart Verwilst <verwilst@gentoo.org>
6
7 ECLASS=flag-o-matic
8 INHERITED="$INHERITED $ECLASS"
9
10 # Please leave ${IUSE} in this until portage .51 is stable, otherwise
11 # IUSE gets clobbered.
12 IUSE="${IUSE} debug"
13
14 #
15 #### filter-flags <flags> ####
16 # Remove particular flags from C[XX]FLAGS
17 # Matches only complete flags
18 #
19 #### append-flags <flags> ####
20 # Add extra flags to your current C[XX]FLAGS
21 #
22 #### replace-flags <orig.flag> <new.flag> ###
23 # Replace a flag by another one
24 #
25 #### replace-cpu-flags <old.cpus> <new.cpu> ###
26 # Replace march/mcpu flags that specify <old.cpus>
27 # with flags that specify <new.cpu>
28 #
29 #### is-flag <flag> ####
30 # Returns "true" if flag is set in C[XX]FLAGS
31 # Matches only complete a flag
32 #
33 #### strip-flags ####
34 # Strip C[XX]FLAGS of everything except known
35 # good options.
36 #
37 #### strip-unsupported-flags ####
38 # Strip C[XX]FLAGS of any flags not supported by
39 # installed version of gcc
40 #
41 #### get-flag <flag> ####
42 # Find and echo the value for a particular flag
43 #
44 #### replace-sparc64-flags ####
45 # Sets mcpu to v8 and uses the original value
46 # as mtune if none specified.
47 #
48 #### filter-mfpmath <math types> ####
49 # Remove specified math types from the fpmath specification
50 # If the user has -mfpmath=sse,386, running `filter-mfpmath sse`
51 # will leave the user with -mfpmath=386
52 #
53 #### append-ldflags ####
54 # Add extra flags to your current LDFLAGS
55 #
56 #### filter-ldflags <flags> ####
57 # Remove particular flags from LDFLAGS
58 # Matches only complete flags
59 #
60 #### etexec-flags ####
61 # hooked function for hardened gcc that appends
62 # -fno-pic to {C,CXX,LD}FLAGS
63 # when a package is filtering -fpic, -fPIC, -fpie, -fPIE
64 #
65 #### fstack-flags ####
66 # hooked function for hardened gcc that appends
67 # -fno-stack-protector to {C,CXX,LD}FLAGS
68 # when a package is filtering -fstack-protector, -fstack-protector-all
69 # notice: modern automatic specs files will also suppress -fstack-protector-all
70 # when only -fno-stack-protector is given
71 #
72
73 # C[XX]FLAGS that we allow in strip-flags
74 setup-allowed-flags() {
75 if [ -z "${ALLOWED_FLAGS}" ] ; then
76 export ALLOWED_FLAGS="-O -O1 -O2 -mcpu -march -mtune -fstack-protector -fno-stack-protector -fno-pie -fno-unit-at-a-time -pipe -g"
77 case "${ARCH}" in
78 mips) ALLOWED_FLAGS="${ALLOWED_FLAGS} -mips1 -mips2 -mips3 -mips4 -mabi" ;;
79 amd64) ALLOWED_FLAGS="${ALLOWED_FLAGS} -fPIC -m64" ;;
80 x86) ALLOWED_FLAGS="${ALLOWED_FLAGS} -m32" ;;
81 alpha) ALLOWED_FLAGS="${ALLOWED_FLAGS} -fPIC" ;;
82 ia64) ALLOWED_FLAGS="${ALLOWED_FLAGS} -fPIC" ;;
83 esac
84 fi
85 # allow a bunch of flags that negate features / control ABI
86 ALLOWED_FLAGS="${ALLOWED_FLAGS} -fno-stack-protector -fno-stack-protector-all"
87 case "${ARCH}" in
88 x86|amd64|ia64) ALLOWED_FLAGS="${ALLOWED_FLAGS} -mno-mmx -mno-sse -mno-sse2 -mno-sse3 -mno-3dnow" ;;
89 esac
90 ALLOWED_FLAGS="${ALLOWED_FLAGS} -mregparm -mno-app-regs -mapp-regs -msoft-float -mflat -mno-faster-structs -mfaster-structs -mlittle-endian -mbig-endian -mlive-g0 -mcmodel -mno-stack-bias -mstack-bias"
91
92 # C[XX]FLAGS that we are think is ok, but needs testing
93 # NOTE: currently -Os have issues with gcc3 and K6* arch's
94 export UNSTABLE_FLAGS="-Os -O3 -freorder-blocks -fprefetch-loop-arrays"
95 return 0
96 }
97
98 filter-flags() {
99 local x f fset
100 declare -a new_CFLAGS new_CXXFLAGS
101
102 for x in "$@" ; do
103 case "${x}" in
104 -fPIC|-fpic|-fPIE|-fpie|-pie) etexec-flags;;
105 -fstack-protector|-fstack-protector-all) fstack-flags;;
106 esac
107 done
108
109 for fset in CFLAGS CXXFLAGS; do
110 # Looping over the flags instead of using a global
111 # substitution ensures that we're working with flag atoms.
112 # Otherwise globs like -O* have the potential to wipe out the
113 # list of flags.
114 for f in ${!fset}; do
115 for x in "$@"; do
116 # Note this should work with globs like -O*
117 [[ ${f} == ${x} ]] && continue 2
118 done
119 eval new_${fset}\[\${\#new_${fset}\[@]}]=\${f}
120 done
121 eval export ${fset}=\${new_${fset}\[*]}
122 done
123
124 return 0
125 }
126
127 filter-lfs-flags() {
128 filter-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
129 }
130
131 append-lfs-flags() {
132 append-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
133 }
134
135 append-flags() {
136 export CFLAGS="${CFLAGS} $*"
137 export CXXFLAGS="${CXXFLAGS} $*"
138 [ -n "`is-flag -fno-stack-protector`" -o \
139 -n "`is-flag -fno-stack-protector-all`" ] && fstack-flags
140 return 0
141 }
142
143 replace-flags() {
144 local f fset
145 declare -a new_CFLAGS new_CXXFLAGS
146
147 for fset in CFLAGS CXXFLAGS; do
148 # Looping over the flags instead of using a global
149 # substitution ensures that we're working with flag atoms.
150 # Otherwise globs like -O* have the potential to wipe out the
151 # list of flags.
152 for f in ${!fset}; do
153 # Note this should work with globs like -O*
154 [[ ${f} == ${1} ]] && f=${2}
155 eval new_${fset}\[\${\#new_${fset}\[@]}]=\${f}
156 done
157 eval export ${fset}=\${new_${fset}\[*]}
158 done
159
160 return 0
161 }
162
163 replace-cpu-flags() {
164 local newcpu="$#" ; newcpu="${!newcpu}"
165 while [ $# -gt 1 ] ; do
166 # quote to make sure that no globbing is done (particularly on
167 # ${oldcpu} prior to calling replace-flags
168 replace-flags "-march=${1}" "-march=${newcpu}"
169 replace-flags "-mcpu=${1}" "-mcpu=${newcpu}"
170 replace-flags "-mtune=${1}" "-mtune=${newcpu}"
171 shift
172 done
173 return 0
174 }
175
176 is-flag() {
177 local x
178
179 for x in ${CFLAGS} ${CXXFLAGS} ; do
180 # Note this should work with globs like -mcpu=ultrasparc*
181 if [[ ${x} == ${1} ]]; then
182 echo true
183 return 0
184 fi
185 done
186 return 1
187 }
188
189 filter-mfpmath() {
190 local orig_mfpmath new_math prune_math
191
192 # save the original -mfpmath flag
193 orig_mfpmath="`get-flag -mfpmath`"
194 # get the value of the current -mfpmath flag
195 new_math=" `get-flag mfpmath | tr , ' '` "
196 # figure out which math values are to be removed
197 prune_math=""
198 for prune_math in "$@" ; do
199 new_math="${new_math/ ${prune_math} / }"
200 done
201 new_math="`echo ${new_math:1:${#new_math}-2} | tr ' ' ,`"
202
203 if [ -z "${new_math}" ] ; then
204 # if we're removing all user specified math values are
205 # slated for removal, then we just filter the flag
206 filter-flags ${orig_mfpmath}
207 else
208 # if we only want to filter some of the user specified
209 # math values, then we replace the current flag
210 replace-flags ${orig_mfpmath} -mfpmath=${new_math}
211 fi
212 return 0
213 }
214
215 strip-flags() {
216 local x y flag NEW_CFLAGS NEW_CXXFLAGS
217
218 setup-allowed-flags
219
220 local NEW_CFLAGS=""
221 local NEW_CXXFLAGS=""
222
223 # Allow unstable C[XX]FLAGS if we are using unstable profile ...
224 if has ~${ARCH} ${ACCEPT_KEYWORDS} ; then
225 use debug && einfo "Enabling the use of some unstable flags"
226 ALLOWED_FLAGS="${ALLOWED_FLAGS} ${UNSTABLE_FLAGS}"
227 fi
228
229 set -f # disable pathname expansion
230
231 for x in ${CFLAGS}; do
232 for y in ${ALLOWED_FLAGS}; do
233 flag=${x%%=*}
234 if [ "${flag%%${y}}" = "" ] ; then
235 NEW_CFLAGS="${NEW_CFLAGS} ${x}"
236 break
237 fi
238 done
239 done
240
241 for x in ${CXXFLAGS}; do
242 for y in ${ALLOWED_FLAGS}; do
243 flag=${x%%=*}
244 if [ "${flag%%${y}}" = "" ] ; then
245 NEW_CXXFLAGS="${NEW_CXXFLAGS} ${x}"
246 break
247 fi
248 done
249 done
250
251 # In case we filtered out all optimization flags fallback to -O2
252 if [ "${CFLAGS/-O}" != "${CFLAGS}" -a "${NEW_CFLAGS/-O}" = "${NEW_CFLAGS}" ]; then
253 NEW_CFLAGS="${NEW_CFLAGS} -O2"
254 fi
255 if [ "${CXXFLAGS/-O}" != "${CXXFLAGS}" -a "${NEW_CXXFLAGS/-O}" = "${NEW_CXXFLAGS}" ]; then
256 NEW_CXXFLAGS="${NEW_CXXFLAGS} -O2"
257 fi
258
259 set +f # re-enable pathname expansion
260
261 export CFLAGS="${NEW_CFLAGS}"
262 export CXXFLAGS="${NEW_CXXFLAGS}"
263 return 0
264 }
265
266 test_flag() {
267 local cc=${CC:-gcc} ; cc=${cc%% *}
268 if ${cc} -S -xc "$@" -o /dev/null /dev/null &>/dev/null; then
269 printf "%s\n" "$*"
270 return 0
271 fi
272 return 1
273 }
274
275 test_version_info() {
276 local cc=${CC:-gcc} ; cc=${cc%% *}
277 if [[ $(${cc} --version 2>&1) == *$1* ]]; then
278 return 0
279 else
280 return 1
281 fi
282 }
283
284 strip-unsupported-flags() {
285 local NEW_CFLAGS NEW_CXXFLAGS
286
287 for x in ${CFLAGS} ; do
288 NEW_CFLAGS="${NEW_CFLAGS} `test_flag ${x}`"
289 done
290 for x in ${CXXFLAGS} ; do
291 NEW_CXXFLAGS="${NEW_CXXFLAGS} `test_flag ${x}`"
292 done
293
294 export CFLAGS="${NEW_CFLAGS}"
295 export CXXFLAGS="${NEW_CXXFLAGS}"
296 }
297
298 get-flag() {
299 local f findflag="$1"
300
301 # this code looks a little flaky but seems to work for
302 # everything we want ...
303 # for example, if CFLAGS="-march=i686":
304 # `get-flag -march` == "-march=i686"
305 # `get-flag march` == "i686"
306 for f in ${CFLAGS} ${CXXFLAGS} ; do
307 if [ "${f/${findflag}}" != "${f}" ] ; then
308 printf "%s\n" "${f/-${findflag}=}"
309 return 0
310 fi
311 done
312 return 1
313 }
314
315 has_hardened() {
316 test_version_info Hardened && return 0
317 # the specs file wont exist unless gcc has GCC_SPECS support
318 [ -f "${GCC_SPECS}" -a "${GCC_SPECS}" != "${GCC_SPECS/hardened/}" ] && \
319 return 0
320 return 1
321 }
322
323 has_pic() {
324 [ "${CFLAGS/-fPIC}" != "${CFLAGS}" ] && return 0
325 [ "${CFLAGS/-fpic}" != "${CFLAGS}" ] && return 0
326 test_version_info pie && return 0
327 return 1
328 }
329
330 has_pie() {
331 [ "${CFLAGS/-fPIE}" != "${CFLAGS}" ] && return 0
332 [ "${CFLAGS/-fpie}" != "${CFLAGS}" ] && return 0
333 test_version_info pie && return 0
334 return 1
335 }
336
337 has_ssp() {
338 [ "${CFLAGS/-fstack-protector}" != "${CFLAGS}" ] && return 0
339 test_version_info ssp && return 0
340 return 1
341 }
342
343 has_m64() {
344 # this doesnt test if the flag is accepted, it tests if the flag
345 # actually -WORKS-. non-multilib gcc will take both -m32 and -m64!
346 # please dont replace this function with test_flag in some future
347 # clean-up!
348 temp=`mktemp`
349 echo "int main() { return(0); }" > ${temp}.c
350 ${CC/ .*/} -m64 -o /dev/null ${temp}.c > /dev/null 2>&1
351 ret=$?
352 rm -f ${temp}.c
353 [ "$ret" != "1" ] && return 0
354 return 1
355 }
356
357 has_m32() {
358 # this doesnt test if the flag is accepted, it tests if the flag
359 # actually -WORKS-. non-multilib gcc will take both -m32 and -m64!
360 # please dont replace this function with test_flag in some future
361 # clean-up!
362 temp=`mktemp`
363 echo "int main() { return(0); }" > ${temp}.c
364 ${CC/ .*/} -m32 -o /dev/null ${temp}.c > /dev/null 2>&1
365 ret=$?
366 rm -f ${temp}.c
367 [ "$ret" != "1" ] && return 0
368 return 1
369 }
370
371 replace-sparc64-flags() {
372 local SPARC64_CPUS="ultrasparc v9"
373
374 if [ "${CFLAGS/mtune}" != "${CFLAGS}" ]; then
375 for x in ${SPARC64_CPUS}; do
376 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8}"
377 done
378 else
379 for x in ${SPARC64_CPUS}; do
380 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
381 done
382 fi
383
384 if [ "${CXXFLAGS/mtune}" != "${CXXFLAGS}" ]; then
385 for x in ${SPARC64_CPUS}; do
386 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8}"
387 done
388 else
389 for x in ${SPARC64_CPUS}; do
390 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
391 done
392 fi
393
394 export CFLAGS CXXFLAGS
395 }
396
397 append-ldflags() {
398 export LDFLAGS="${LDFLAGS} $*"
399 return 0
400 }
401
402 filter-ldflags() {
403 local x
404
405 # we do this fancy spacing stuff so as to not filter
406 # out part of a flag ... we want flag atoms ! :D
407 LDFLAGS=" ${LDFLAGS} "
408 for x in "$@" ; do
409 LDFLAGS="${LDFLAGS// ${x} / }"
410 done
411 LDFLAGS="${LDFLAGS:1:${#LDFLAGS}-2}"
412 export LDFLAGS
413 return 0
414 }
415
416 etexec-flags() {
417 # if you're not using a hardened compiler you wont need this
418 # PIC/no-pic kludge in the first place.
419 has_hardened || return 0
420 # this kludge breaks on amd64, and probably other -fPIC dependant
421 # archs.
422 use amd64 && return 0
423
424 if has_pie || has_pic; then
425 [ -z "`is-flag -fno-pic`" ] &&
426 export CFLAGS="${CFLAGS} `test_flag -fno-pic`"
427 [ -z "`is-flag -nopie`" ] &&
428 export CFLAGS="${CFLAGS} `test_flag -nopie`"
429 fi
430 return 0
431 }
432
433 fstack-flags() {
434 if has_ssp; then
435 [ -z "`is-flag -fno-stack-protector`" ] &&
436 export CFLAGS="${CFLAGS} `test_flag -fno-stack-protector`"
437 fi
438 return 0
439 }

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