/[gentoo-x86]/eclass/flag-o-matic.eclass
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Revision 1.72 - (show annotations) (download)
Sat Oct 9 18:28:46 2004 UTC (9 years, 10 months ago) by vapier
Branch: MAIN
Changes since 1.71: +11 -8 lines
dont output to /dev/null, use a temp file instead

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 1.71 2004/10/01 10:00:36 robbat2 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 # need access to emktemp()
15 inherit eutils
16
17 #
18 #### filter-flags <flags> ####
19 # Remove particular flags from C[XX]FLAGS
20 # Matches only complete flags
21 #
22 #### append-flags <flags> ####
23 # Add extra flags to your current C[XX]FLAGS
24 #
25 #### replace-flags <orig.flag> <new.flag> ###
26 # Replace a flag by another one
27 #
28 #### replace-cpu-flags <old.cpus> <new.cpu> ###
29 # Replace march/mcpu flags that specify <old.cpus>
30 # with flags that specify <new.cpu>
31 #
32 #### is-flag <flag> ####
33 # Returns "true" if flag is set in C[XX]FLAGS
34 # Matches only complete a flag
35 #
36 #### strip-flags ####
37 # Strip C[XX]FLAGS of everything except known
38 # good options.
39 #
40 #### strip-unsupported-flags ####
41 # Strip C[XX]FLAGS of any flags not supported by
42 # installed version of gcc
43 #
44 #### get-flag <flag> ####
45 # Find and echo the value for a particular flag
46 #
47 #### replace-sparc64-flags ####
48 # Sets mcpu to v8 and uses the original value
49 # as mtune if none specified.
50 #
51 #### filter-mfpmath <math types> ####
52 # Remove specified math types from the fpmath specification
53 # If the user has -mfpmath=sse,386, running `filter-mfpmath sse`
54 # will leave the user with -mfpmath=386
55 #
56 #### append-ldflags ####
57 # Add extra flags to your current LDFLAGS
58 #
59 #### filter-ldflags <flags> ####
60 # Remove particular flags from LDFLAGS
61 # Matches only complete flags
62 #
63 #### etexec-flags ####
64 # hooked function for hardened gcc that appends
65 # -fno-pic to {C,CXX,LD}FLAGS
66 # when a package is filtering -fpic, -fPIC, -fpie, -fPIE
67 #
68 #### fstack-flags ####
69 # hooked function for hardened gcc that appends
70 # -fno-stack-protector to {C,CXX,LD}FLAGS
71 # when a package is filtering -fstack-protector, -fstack-protector-all
72 # notice: modern automatic specs files will also suppress -fstack-protector-all
73 # when only -fno-stack-protector is given
74 #
75
76 # C[XX]FLAGS that we allow in strip-flags
77 setup-allowed-flags() {
78 if [ -z "${ALLOWED_FLAGS}" ] ; then
79 export ALLOWED_FLAGS="-O -O1 -O2 -mcpu -march -mtune -fstack-protector -fno-stack-protector -fno-pie -fno-unit-at-a-time -pipe -g"
80 case "${ARCH}" in
81 mips) ALLOWED_FLAGS="${ALLOWED_FLAGS} -mips1 -mips2 -mips3 -mips4 -mips32 -mips64 -mips16 -EL -EB -mabi" ;;
82 amd64) ALLOWED_FLAGS="${ALLOWED_FLAGS} -fPIC -m64" ;;
83 x86) ALLOWED_FLAGS="${ALLOWED_FLAGS} -m32" ;;
84 alpha) ALLOWED_FLAGS="${ALLOWED_FLAGS} -fPIC" ;;
85 ia64) ALLOWED_FLAGS="${ALLOWED_FLAGS} -fPIC" ;;
86 esac
87 fi
88 # allow a bunch of flags that negate features / control ABI
89 ALLOWED_FLAGS="${ALLOWED_FLAGS} -fno-stack-protector -fno-stack-protector-all"
90 case "${ARCH}" in
91 x86|amd64|ia64) ALLOWED_FLAGS="${ALLOWED_FLAGS} -mno-mmx -mno-sse -mno-sse2 -mno-sse3 -mno-3dnow" ;;
92 esac
93 ALLOWED_FLAGS="${ALLOWED_FLAGS} -mregparm -mno-app-regs -mapp-regs -msoft-float -mflat -mno-faster-structs -mfaster-structs -mlittle-endian -mbig-endian -mlive-g0 -mcmodel -mno-stack-bias -mstack-bias"
94
95 # C[XX]FLAGS that we are think is ok, but needs testing
96 # NOTE: currently -Os have issues with gcc3 and K6* arch's
97 export UNSTABLE_FLAGS="-Os -O3 -freorder-blocks -fprefetch-loop-arrays"
98 return 0
99 }
100
101 filter-flags() {
102 local x f fset
103 declare -a new_CFLAGS new_CXXFLAGS
104
105 for x in "$@" ; do
106 case "${x}" in
107 -fPIC|-fpic|-fPIE|-fpie|-pie) etexec-flags;;
108 -fstack-protector|-fstack-protector-all) fstack-flags;;
109 esac
110 done
111
112 for fset in CFLAGS CXXFLAGS; do
113 # Looping over the flags instead of using a global
114 # substitution ensures that we're working with flag atoms.
115 # Otherwise globs like -O* have the potential to wipe out the
116 # list of flags.
117 for f in ${!fset}; do
118 for x in "$@"; do
119 # Note this should work with globs like -O*
120 [[ ${f} == ${x} ]] && continue 2
121 done
122 eval new_${fset}\[\${\#new_${fset}\[@]}]=\${f}
123 done
124 eval export ${fset}=\${new_${fset}\[*]}
125 done
126
127 return 0
128 }
129
130 filter-lfs-flags() {
131 filter-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
132 }
133
134 append-lfs-flags() {
135 append-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
136 }
137
138 append-flags() {
139 export CFLAGS="${CFLAGS} $*"
140 export CXXFLAGS="${CXXFLAGS} $*"
141 [ -n "`is-flag -fno-stack-protector`" -o \
142 -n "`is-flag -fno-stack-protector-all`" ] && fstack-flags
143 return 0
144 }
145
146 replace-flags() {
147 local f fset
148 declare -a new_CFLAGS new_CXXFLAGS
149
150 for fset in CFLAGS CXXFLAGS; do
151 # Looping over the flags instead of using a global
152 # substitution ensures that we're working with flag atoms.
153 # Otherwise globs like -O* have the potential to wipe out the
154 # list of flags.
155 for f in ${!fset}; do
156 # Note this should work with globs like -O*
157 [[ ${f} == ${1} ]] && f=${2}
158 eval new_${fset}\[\${\#new_${fset}\[@]}]=\${f}
159 done
160 eval export ${fset}=\${new_${fset}\[*]}
161 done
162
163 return 0
164 }
165
166 replace-cpu-flags() {
167 local newcpu="$#" ; newcpu="${!newcpu}"
168 while [ $# -gt 1 ] ; do
169 # quote to make sure that no globbing is done (particularly on
170 # ${oldcpu} prior to calling replace-flags
171 replace-flags "-march=${1}" "-march=${newcpu}"
172 replace-flags "-mcpu=${1}" "-mcpu=${newcpu}"
173 replace-flags "-mtune=${1}" "-mtune=${newcpu}"
174 shift
175 done
176 return 0
177 }
178
179 is-flag() {
180 local x
181
182 for x in ${CFLAGS} ${CXXFLAGS} ; do
183 # Note this should work with globs like -mcpu=ultrasparc*
184 if [[ ${x} == ${1} ]]; then
185 echo true
186 return 0
187 fi
188 done
189 return 1
190 }
191
192 filter-mfpmath() {
193 local orig_mfpmath new_math prune_math
194
195 # save the original -mfpmath flag
196 orig_mfpmath="`get-flag -mfpmath`"
197 # get the value of the current -mfpmath flag
198 new_math=" `get-flag mfpmath | tr , ' '` "
199 # figure out which math values are to be removed
200 prune_math=""
201 for prune_math in "$@" ; do
202 new_math="${new_math/ ${prune_math} / }"
203 done
204 new_math="`echo ${new_math:1:${#new_math}-2} | tr ' ' ,`"
205
206 if [ -z "${new_math}" ] ; then
207 # if we're removing all user specified math values are
208 # slated for removal, then we just filter the flag
209 filter-flags ${orig_mfpmath}
210 else
211 # if we only want to filter some of the user specified
212 # math values, then we replace the current flag
213 replace-flags ${orig_mfpmath} -mfpmath=${new_math}
214 fi
215 return 0
216 }
217
218 strip-flags() {
219 local x y flag NEW_CFLAGS NEW_CXXFLAGS
220
221 setup-allowed-flags
222
223 local NEW_CFLAGS=""
224 local NEW_CXXFLAGS=""
225
226 # Allow unstable C[XX]FLAGS if we are using unstable profile ...
227 if has ~${ARCH} ${ACCEPT_KEYWORDS} ; then
228 use debug && einfo "Enabling the use of some unstable flags"
229 ALLOWED_FLAGS="${ALLOWED_FLAGS} ${UNSTABLE_FLAGS}"
230 fi
231
232 set -f # disable pathname expansion
233
234 for x in ${CFLAGS}; do
235 for y in ${ALLOWED_FLAGS}; do
236 flag=${x%%=*}
237 if [ "${flag%%${y}}" = "" ] ; then
238 NEW_CFLAGS="${NEW_CFLAGS} ${x}"
239 break
240 fi
241 done
242 done
243
244 for x in ${CXXFLAGS}; do
245 for y in ${ALLOWED_FLAGS}; do
246 flag=${x%%=*}
247 if [ "${flag%%${y}}" = "" ] ; then
248 NEW_CXXFLAGS="${NEW_CXXFLAGS} ${x}"
249 break
250 fi
251 done
252 done
253
254 # In case we filtered out all optimization flags fallback to -O2
255 if [ "${CFLAGS/-O}" != "${CFLAGS}" -a "${NEW_CFLAGS/-O}" = "${NEW_CFLAGS}" ]; then
256 NEW_CFLAGS="${NEW_CFLAGS} -O2"
257 fi
258 if [ "${CXXFLAGS/-O}" != "${CXXFLAGS}" -a "${NEW_CXXFLAGS/-O}" = "${NEW_CXXFLAGS}" ]; then
259 NEW_CXXFLAGS="${NEW_CXXFLAGS} -O2"
260 fi
261
262 set +f # re-enable pathname expansion
263
264 export CFLAGS="${NEW_CFLAGS}"
265 export CXXFLAGS="${NEW_CXXFLAGS}"
266 return 0
267 }
268
269 test_flag() {
270 local cc=${CC:-gcc} ; cc=${cc%% *}
271 if ${cc} -S -xc "$@" -o "$(emktemp)" /dev/null &>/dev/null; then
272 printf "%s\n" "$*"
273 return 0
274 fi
275 return 1
276 }
277
278 test_version_info() {
279 local cc=${CC:-gcc} ; cc=${cc%% *}
280 if [[ $(${cc} --version 2>&1) == *$1* ]]; then
281 return 0
282 else
283 return 1
284 fi
285 }
286
287 strip-unsupported-flags() {
288 local NEW_CFLAGS NEW_CXXFLAGS
289
290 for x in ${CFLAGS} ; do
291 NEW_CFLAGS="${NEW_CFLAGS} `test_flag ${x}`"
292 done
293 for x in ${CXXFLAGS} ; do
294 NEW_CXXFLAGS="${NEW_CXXFLAGS} `test_flag ${x}`"
295 done
296
297 export CFLAGS="${NEW_CFLAGS}"
298 export CXXFLAGS="${NEW_CXXFLAGS}"
299 }
300
301 get-flag() {
302 local f findflag="$1"
303
304 # this code looks a little flaky but seems to work for
305 # everything we want ...
306 # for example, if CFLAGS="-march=i686":
307 # `get-flag -march` == "-march=i686"
308 # `get-flag march` == "i686"
309 for f in ${CFLAGS} ${CXXFLAGS} ; do
310 if [ "${f/${findflag}}" != "${f}" ] ; then
311 printf "%s\n" "${f/-${findflag}=}"
312 return 0
313 fi
314 done
315 return 1
316 }
317
318 has_hardened() {
319 test_version_info Hardened && return 0
320 # the specs file wont exist unless gcc has GCC_SPECS support
321 [ -f "${GCC_SPECS}" -a "${GCC_SPECS}" != "${GCC_SPECS/hardened/}" ] && \
322 return 0
323 return 1
324 }
325
326 has_pic() {
327 [ "${CFLAGS/-fPIC}" != "${CFLAGS}" ] && return 0
328 [ "${CFLAGS/-fpic}" != "${CFLAGS}" ] && return 0
329 test_version_info pie && return 0
330 return 1
331 }
332
333 has_pie() {
334 [ "${CFLAGS/-fPIE}" != "${CFLAGS}" ] && return 0
335 [ "${CFLAGS/-fpie}" != "${CFLAGS}" ] && return 0
336 test_version_info pie && return 0
337 return 1
338 }
339
340 has_ssp() {
341 [ "${CFLAGS/-fstack-protector}" != "${CFLAGS}" ] && return 0
342 test_version_info ssp && return 0
343 return 1
344 }
345
346 has_m64() {
347 # this doesnt test if the flag is accepted, it tests if the flag
348 # actually -WORKS-. non-multilib gcc will take both -m32 and -m64!
349 # please dont replace this function with test_flag in some future
350 # clean-up!
351 local temp="$(emktemp)"
352 echo "int main() { return(0); }" > ${temp}.c
353 ${CC/ .*/} -m64 -o "$(emktemp)" ${temp}.c > /dev/null 2>&1
354 local ret=$?
355 rm -f ${temp}.c
356 [ "$ret" != "1" ] && return 0
357 return 1
358 }
359
360 has_m32() {
361 # this doesnt test if the flag is accepted, it tests if the flag
362 # actually -WORKS-. non-multilib gcc will take both -m32 and -m64!
363 # please dont replace this function with test_flag in some future
364 # clean-up!
365 local temp="$(emktemp)"
366 echo "int main() { return(0); }" > ${temp}.c
367 ${CC/ .*/} -m32 -o "$(emktemp)" ${temp}.c > /dev/null 2>&1
368 local ret=$?
369 rm -f ${temp}.c
370 [ "$ret" != "1" ] && return 0
371 return 1
372 }
373
374 replace-sparc64-flags() {
375 local SPARC64_CPUS="ultrasparc v9"
376
377 if [ "${CFLAGS/mtune}" != "${CFLAGS}" ]; then
378 for x in ${SPARC64_CPUS}; do
379 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8}"
380 done
381 else
382 for x in ${SPARC64_CPUS}; do
383 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
384 done
385 fi
386
387 if [ "${CXXFLAGS/mtune}" != "${CXXFLAGS}" ]; then
388 for x in ${SPARC64_CPUS}; do
389 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8}"
390 done
391 else
392 for x in ${SPARC64_CPUS}; do
393 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
394 done
395 fi
396
397 export CFLAGS CXXFLAGS
398 }
399
400 append-ldflags() {
401 export LDFLAGS="${LDFLAGS} $*"
402 return 0
403 }
404
405 filter-ldflags() {
406 local x
407
408 # we do this fancy spacing stuff so as to not filter
409 # out part of a flag ... we want flag atoms ! :D
410 LDFLAGS=" ${LDFLAGS} "
411 for x in "$@" ; do
412 LDFLAGS="${LDFLAGS// ${x} / }"
413 done
414 LDFLAGS="${LDFLAGS:1:${#LDFLAGS}-2}"
415 export LDFLAGS
416 return 0
417 }
418
419 etexec-flags() {
420 # if you're not using a hardened compiler you wont need this
421 # PIC/no-pic kludge in the first place.
422 has_hardened || return 0
423 # this kludge breaks on amd64, and probably other -fPIC dependant
424 # archs.
425 use amd64 && return 0
426
427 if has_pie || has_pic; then
428 [ -z "`is-flag -fno-pic`" ] &&
429 export CFLAGS="${CFLAGS} `test_flag -fno-pic`"
430 [ -z "`is-flag -nopie`" ] &&
431 export CFLAGS="${CFLAGS} `test_flag -nopie`"
432 fi
433 return 0
434 }
435
436 fstack-flags() {
437 if has_ssp; then
438 [ -z "`is-flag -fno-stack-protector`" ] &&
439 export CFLAGS="${CFLAGS} `test_flag -fno-stack-protector`"
440 fi
441 return 0
442 }

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