/[gentoo-x86]/eclass/flag-o-matic.eclass
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Revision 1.84 - (show annotations) (download)
Fri Mar 18 03:48:14 2005 UTC (9 years, 7 months ago) by vapier
Branch: MAIN
Changes since 1.83: +12 -12 lines
fix bug in stripping ldflags when you stripped the only item

1 # Copyright 1999-2005 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 1.83 2005/02/19 07:11:31 mr_bones_ Exp $
4
5 ECLASS=flag-o-matic
6 INHERITED="$INHERITED $ECLASS"
7
8 IUSE="debug"
9
10 # need access to emktemp()
11 inherit eutils toolchain-funcs multilib
12
13 #
14 #### filter-flags <flags> ####
15 # Remove particular flags from C[XX]FLAGS
16 # Matches only complete flags
17 #
18 #### append-flags <flags> ####
19 # Add extra flags to your current C[XX]FLAGS
20 #
21 #### replace-flags <orig.flag> <new.flag> ###
22 # Replace a flag by another one
23 #
24 #### replace-cpu-flags <old.cpus> <new.cpu> ###
25 # Replace march/mcpu flags that specify <old.cpus>
26 # with flags that specify <new.cpu>
27 #
28 #### is-flag <flag> ####
29 # Returns "true" if flag is set in C[XX]FLAGS
30 # Matches only complete a flag
31 #
32 #### strip-flags ####
33 # Strip C[XX]FLAGS of everything except known
34 # good options.
35 #
36 #### strip-unsupported-flags ####
37 # Strip C[XX]FLAGS of any flags not supported by
38 # installed version of gcc
39 #
40 #### get-flag <flag> ####
41 # Find and echo the value for a particular flag
42 #
43 #### replace-sparc64-flags ####
44 # Sets mcpu to v8 and uses the original value
45 # as mtune if none specified.
46 #
47 #### filter-mfpmath <math types> ####
48 # Remove specified math types from the fpmath specification
49 # If the user has -mfpmath=sse,386, running `filter-mfpmath sse`
50 # will leave the user with -mfpmath=386
51 #
52 #### append-ldflags ####
53 # Add extra flags to your current LDFLAGS
54 #
55 #### filter-ldflags <flags> ####
56 # Remove particular flags from LDFLAGS
57 # Matches only complete flags
58 #
59 #### fstack-flags ####
60 # hooked function for hardened gcc that appends
61 # -fno-stack-protector to {C,CXX,LD}FLAGS
62 # when a package is filtering -fstack-protector, -fstack-protector-all
63 # notice: modern automatic specs files will also suppress -fstack-protector-all
64 # when only -fno-stack-protector is given
65 #
66
67 # C[XX]FLAGS that we allow in strip-flags
68 setup-allowed-flags() {
69 if [[ -z ${ALLOWED_FLAGS} ]] ; then
70 export ALLOWED_FLAGS="-pipe"
71 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -O -O0 -O1 -O2 -mcpu -march -mtune"
72 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -fstack-protector -fno-stack-protector"
73 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -fno-pie -fno-unit-at-a-time"
74 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -g -g0 -g1 -g2 -g3 -ggdb -ggdb0 -ggdb1 -ggdb2 -ggdb3"
75 case $(tc-arch) in
76 mips) ALLOWED_FLAGS="${ALLOWED_FLAGS} -mips1 -mips2 -mips3 -mips4 -mips32 -mips64 -mips16 -EL -EB -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 sparc) ALLOWED_FLAGS="${ALLOWED_FLAGS} -m32 -m64" ;;
82 ppc) ALLOWED_FLAGS="${ALLOWED_FLAGS} -mabi" ;;
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 $(tc-arch) in
88 x86|amd64|ia64) ALLOWED_FLAGS="${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)
105 append-flags `test_flag -fno-pie`;;
106 -fstack-protector|-fstack-protector-all)
107 fstack-flags;;
108 esac
109 done
110
111 for fset in CFLAGS CXXFLAGS; do
112 # Looping over the flags instead of using a global
113 # substitution ensures that we're working with flag atoms.
114 # Otherwise globs like -O* have the potential to wipe out the
115 # list of flags.
116 for f in ${!fset}; do
117 for x in "$@"; do
118 # Note this should work with globs like -O*
119 [[ ${f} == ${x} ]] && continue 2
120 done
121 eval new_${fset}\[\${\#new_${fset}\[@]}]=\${f}
122 done
123 eval export ${fset}=\${new_${fset}\[*]}
124 done
125
126 return 0
127 }
128
129 filter-lfs-flags() {
130 filter-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
131 }
132
133 append-lfs-flags() {
134 append-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
135 }
136
137 append-flags() {
138 [[ -z $* ]] && return 0
139 export CFLAGS="${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 ~$(tc-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 if $(tc-getCC) -S -xc "$@" -o "$(emktemp)" /dev/null &>/dev/null; then
271 printf "%s\n" "$*"
272 return 0
273 fi
274 return 1
275 }
276
277 test_version_info() {
278 if [[ $($(tc-getCC) --version 2>&1) == *$1* ]]; then
279 return 0
280 else
281 return 1
282 fi
283 }
284
285 strip-unsupported-flags() {
286 local NEW_CFLAGS NEW_CXXFLAGS
287
288 for x in ${CFLAGS} ; do
289 NEW_CFLAGS="${NEW_CFLAGS} `test_flag ${x}`"
290 done
291 for x in ${CXXFLAGS} ; do
292 NEW_CXXFLAGS="${NEW_CXXFLAGS} `test_flag ${x}`"
293 done
294
295 export CFLAGS="${NEW_CFLAGS}"
296 export CXXFLAGS="${NEW_CXXFLAGS}"
297 }
298
299 get-flag() {
300 local f findflag="$1"
301
302 # this code looks a little flaky but seems to work for
303 # everything we want ...
304 # for example, if CFLAGS="-march=i686":
305 # `get-flag -march` == "-march=i686"
306 # `get-flag march` == "i686"
307 for f in ${CFLAGS} ${CXXFLAGS} ; do
308 if [ "${f/${findflag}}" != "${f}" ] ; then
309 printf "%s\n" "${f/-${findflag}=}"
310 return 0
311 fi
312 done
313 return 1
314 }
315
316 has_hardened() {
317 test_version_info Hardened && return 0
318 # the specs file wont exist unless gcc has GCC_SPECS support
319 [ -f "${GCC_SPECS}" -a "${GCC_SPECS}" != "${GCC_SPECS/hardened/}" ] && \
320 return 0
321 return 1
322 }
323
324 # indicate whether PIC is set
325 has_pic() {
326 [ "${CFLAGS/-fPIC}" != "${CFLAGS}" ] && return 0
327 [ "${CFLAGS/-fpic}" != "${CFLAGS}" ] && return 0
328 [ "$(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __PIC__)" ] && return 0
329 test_version_info pie && return 0
330 return 1
331 }
332
333 # indicate whether PIE is set
334 has_pie() {
335 [ "${CFLAGS/-fPIE}" != "${CFLAGS}" ] && return 0
336 [ "${CFLAGS/-fpie}" != "${CFLAGS}" ] && return 0
337 [ "$(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __PIE__)" ] && return 0
338 # test PIC while waiting for specs to be updated to generate __PIE__
339 [ "$(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __PIC__)" ] && return 0
340 return 1
341 }
342
343 # indicate whether code for SSP is being generated
344 has_ssp() {
345 # note; this matches both -fstack-protector and -fstack-protector-all
346 [ "${CFLAGS/-fstack-protector}" != "${CFLAGS}" ] && return 0
347 [ "$(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __SSP__)" ] && return 0
348 return 1
349 }
350
351 has_m64() {
352 # this doesnt test if the flag is accepted, it tests if the flag
353 # actually -WORKS-. non-multilib gcc will take both -m32 and -m64!
354 # please dont replace this function with test_flag in some future
355 # clean-up!
356 local temp="$(emktemp)"
357 echo "int main() { return(0); }" > ${temp}.c
358 MY_CC=$(tc-getCC)
359 ${MY_CC/ .*/} -m64 -o "$(emktemp)" ${temp}.c > /dev/null 2>&1
360 local ret=$?
361 rm -f ${temp}.c
362 [ "$ret" != "1" ] && return 0
363 return 1
364 }
365
366 has_m32() {
367 # this doesnt test if the flag is accepted, it tests if the flag
368 # actually -WORKS-. non-multilib gcc will take both -m32 and -m64!
369 # please dont replace this function with test_flag in some future
370 # clean-up!
371
372 [ "$(tc-arch)" = "amd64" ] && has_multilib_profile && return 0
373
374 local temp="$(emktemp)"
375 echo "int main() { return(0); }" > ${temp}.c
376 MY_CC=$(tc-getCC)
377 ${MY_CC/ .*/} -m32 -o "$(emktemp)" ${temp}.c > /dev/null 2>&1
378 local ret=$?
379 rm -f ${temp}.c
380 [ "$ret" != "1" ] && return 0
381 return 1
382 }
383
384 replace-sparc64-flags() {
385 local SPARC64_CPUS="ultrasparc v9"
386
387 if [ "${CFLAGS/mtune}" != "${CFLAGS}" ]; then
388 for x in ${SPARC64_CPUS}; do
389 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8}"
390 done
391 else
392 for x in ${SPARC64_CPUS}; do
393 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
394 done
395 fi
396
397 if [ "${CXXFLAGS/mtune}" != "${CXXFLAGS}" ]; then
398 for x in ${SPARC64_CPUS}; do
399 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8}"
400 done
401 else
402 for x in ${SPARC64_CPUS}; do
403 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
404 done
405 fi
406
407 export CFLAGS CXXFLAGS
408 }
409
410 append-ldflags() {
411 export LDFLAGS="${LDFLAGS} $*"
412 return 0
413 }
414
415 filter-ldflags() {
416 local x
417
418 # we do this fancy spacing stuff so as to not filter
419 # out part of a flag ... we want flag atoms ! :D
420 LDFLAGS=" ${LDFLAGS} "
421 for x in "$@" ; do
422 LDFLAGS=${LDFLAGS// ${x} / }
423 done
424 [[ -z ${LDFLAGS// } ]] \
425 && LDFLAGS="" \
426 || LDFLAGS=${LDFLAGS:1:${#LDFLAGS}-2}
427 export LDFLAGS
428 return 0
429 }
430
431 fstack-flags() {
432 if has_ssp; then
433 [ -z "`is-flag -fno-stack-protector`" ] &&
434 export CFLAGS="${CFLAGS} `test_flag -fno-stack-protector`"
435 fi
436 return 0
437 }
438
439 # This is thanks to great work from Paul de Vrieze <gentoo-user@devrieze.net>,
440 # bug #9016. Also thanks to Jukka Salmi <salmi@gmx.net> (bug #13907) for more
441 # fixes.
442 #
443 # Export CFLAGS and CXXFLAGS that are compadible with gcc-2.95.3
444 gcc2-flags() {
445 CFLAGS=${CFLAGS//pentium-mmx/i586}
446 CFLAGS=${CFLAGS//pentium[234]/i686}
447 CFLAGS=${CFLAGS//k6-[23]/k6}
448 CFLAGS=${CFLAGS//athlon-tbird/i686}
449 CFLAGS=${CFLAGS//athlon-4/i686}
450 CFLAGS=${CFLAGS//athlon-[xm]p/i686}
451 CFLAGS=${CFLAGS//athlon/i686}
452
453 CXXFLAGS=${CXXFLAGS//pentium-mmx/i586}
454 CXXFLAGS=${CXXFLAGS//pentium[234]/i686}
455 CXXFLAGS=${CXXFLAGS//k6-[23]/k6}
456 CXXFLAGS=${CXXFLAGS//athlon-tbird/i686}
457 CXXFLAGS=${CXXFLAGS//athlon-4/i686}
458 CXXFLAGS=${CXXFLAGS//athlon-[xm]p/i686}
459 CXXFLAGS=${CXXFLAGS//athlon/i686}
460
461 if [[ $(tc-arch) == "alpha" ]] ; then
462 CHOST=${CHOST/#alphaev6[78]/alphaev6}
463 CFLAGS=${CFLAGS//ev6[78]/ev6}
464 CXXFLAGS=${CXXFLAGS//ev6[78]/ev6}
465 fi
466
467 export CFLAGS CXXFLAGS
468 }

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