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Revision 1.81 - (show annotations) (download)
Sat Jan 29 03:09:45 2005 UTC (9 years, 5 months ago) by solar
Branch: MAIN
Changes since 1.80: +10 -3 lines
- flag-o-matic updates from kevin quinn that handle pic/ssp detection

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 1.80 2005/01/20 18:29:13 eradicator 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 # need access to emktemp()
13 inherit eutils toolchain-funcs multilib
14
15 #
16 #### filter-flags <flags> ####
17 # Remove particular flags from C[XX]FLAGS
18 # Matches only complete flags
19 #
20 #### append-flags <flags> ####
21 # Add extra flags to your current C[XX]FLAGS
22 #
23 #### replace-flags <orig.flag> <new.flag> ###
24 # Replace a flag by another one
25 #
26 #### replace-cpu-flags <old.cpus> <new.cpu> ###
27 # Replace march/mcpu flags that specify <old.cpus>
28 # with flags that specify <new.cpu>
29 #
30 #### is-flag <flag> ####
31 # Returns "true" if flag is set in C[XX]FLAGS
32 # Matches only complete a flag
33 #
34 #### strip-flags ####
35 # Strip C[XX]FLAGS of everything except known
36 # good options.
37 #
38 #### strip-unsupported-flags ####
39 # Strip C[XX]FLAGS of any flags not supported by
40 # installed version of gcc
41 #
42 #### get-flag <flag> ####
43 # Find and echo the value for a particular flag
44 #
45 #### replace-sparc64-flags ####
46 # Sets mcpu to v8 and uses the original value
47 # as mtune if none specified.
48 #
49 #### filter-mfpmath <math types> ####
50 # Remove specified math types from the fpmath specification
51 # If the user has -mfpmath=sse,386, running `filter-mfpmath sse`
52 # will leave the user with -mfpmath=386
53 #
54 #### append-ldflags ####
55 # Add extra flags to your current LDFLAGS
56 #
57 #### filter-ldflags <flags> ####
58 # Remove particular flags from LDFLAGS
59 # Matches only complete flags
60 #
61 #### etexec-flags ####
62 # hooked function for hardened gcc that appends
63 # -fno-pic to {C,CXX,LD}FLAGS
64 # when a package is filtering -fpic, -fPIC, -fpie, -fPIE
65 #
66 #### fstack-flags ####
67 # hooked function for hardened gcc that appends
68 # -fno-stack-protector to {C,CXX,LD}FLAGS
69 # when a package is filtering -fstack-protector, -fstack-protector-all
70 # notice: modern automatic specs files will also suppress -fstack-protector-all
71 # when only -fno-stack-protector is given
72 #
73
74 # C[XX]FLAGS that we allow in strip-flags
75 setup-allowed-flags() {
76 if [ -z "${ALLOWED_FLAGS}" ] ; then
77 export ALLOWED_FLAGS="-pipe"
78 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -O -O0 -O1 -O2 -mcpu -march -mtune"
79 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -fstack-protector -fno-stack-protector"
80 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -fno-pie -fno-unit-at-a-time"
81 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -g -g0 -g1 -g2 -g3 -ggdb -ggdb0 -ggdb1 -ggdb2 -ggdb3"
82 case "${ARCH}" in
83 mips) ALLOWED_FLAGS="${ALLOWED_FLAGS} -mips1 -mips2 -mips3 -mips4 -mips32 -mips64 -mips16 -EL -EB -mabi" ;;
84 amd64) ALLOWED_FLAGS="${ALLOWED_FLAGS} -fPIC -m64" ;;
85 x86) ALLOWED_FLAGS="${ALLOWED_FLAGS} -m32" ;;
86 alpha) ALLOWED_FLAGS="${ALLOWED_FLAGS} -fPIC" ;;
87 ia64) ALLOWED_FLAGS="${ALLOWED_FLAGS} -fPIC" ;;
88 sparc) ALLOWED_FLAGS="${ALLOWED_FLAGS} -m32 -m64" ;;
89 ppc) ALLOWED_FLAGS="${ALLOWED_FLAGS} -mabi" ;;
90 esac
91 fi
92 # allow a bunch of flags that negate features / control ABI
93 ALLOWED_FLAGS="${ALLOWED_FLAGS} -fno-stack-protector -fno-stack-protector-all"
94 case "${ARCH}" in
95 x86|amd64|ia64) ALLOWED_FLAGS="${ALLOWED_FLAGS} -mno-mmx -mno-sse -mno-sse2 -mno-sse3 -mno-3dnow" ;;
96 esac
97 ALLOWED_FLAGS="${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"
98
99 # C[XX]FLAGS that we are think is ok, but needs testing
100 # NOTE: currently -Os have issues with gcc3 and K6* arch's
101 export UNSTABLE_FLAGS="-Os -O3 -freorder-blocks -fprefetch-loop-arrays"
102 return 0
103 }
104
105 filter-flags() {
106 local x f fset
107 declare -a new_CFLAGS new_CXXFLAGS
108
109 for x in "$@" ; do
110 case "${x}" in
111 -fPIC|-fpic|-fPIE|-fpie|-pie) etexec-flags;;
112 -fstack-protector|-fstack-protector-all) fstack-flags;;
113 esac
114 done
115
116 for fset in CFLAGS CXXFLAGS; do
117 # Looping over the flags instead of using a global
118 # substitution ensures that we're working with flag atoms.
119 # Otherwise globs like -O* have the potential to wipe out the
120 # list of flags.
121 for f in ${!fset}; do
122 for x in "$@"; do
123 # Note this should work with globs like -O*
124 [[ ${f} == ${x} ]] && continue 2
125 done
126 eval new_${fset}\[\${\#new_${fset}\[@]}]=\${f}
127 done
128 eval export ${fset}=\${new_${fset}\[*]}
129 done
130
131 return 0
132 }
133
134 filter-lfs-flags() {
135 filter-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
136 }
137
138 append-lfs-flags() {
139 append-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
140 }
141
142 append-flags() {
143 export CFLAGS="${CFLAGS} $*"
144 export CXXFLAGS="${CXXFLAGS} $*"
145 [ -n "`is-flag -fno-stack-protector`" -o \
146 -n "`is-flag -fno-stack-protector-all`" ] && fstack-flags
147 return 0
148 }
149
150 replace-flags() {
151 local f fset
152 declare -a new_CFLAGS new_CXXFLAGS
153
154 for fset in CFLAGS CXXFLAGS; do
155 # Looping over the flags instead of using a global
156 # substitution ensures that we're working with flag atoms.
157 # Otherwise globs like -O* have the potential to wipe out the
158 # list of flags.
159 for f in ${!fset}; do
160 # Note this should work with globs like -O*
161 [[ ${f} == ${1} ]] && f=${2}
162 eval new_${fset}\[\${\#new_${fset}\[@]}]=\${f}
163 done
164 eval export ${fset}=\${new_${fset}\[*]}
165 done
166
167 return 0
168 }
169
170 replace-cpu-flags() {
171 local newcpu="$#" ; newcpu="${!newcpu}"
172 while [ $# -gt 1 ] ; do
173 # quote to make sure that no globbing is done (particularly on
174 # ${oldcpu} prior to calling replace-flags
175 replace-flags "-march=${1}" "-march=${newcpu}"
176 replace-flags "-mcpu=${1}" "-mcpu=${newcpu}"
177 replace-flags "-mtune=${1}" "-mtune=${newcpu}"
178 shift
179 done
180 return 0
181 }
182
183 is-flag() {
184 local x
185
186 for x in ${CFLAGS} ${CXXFLAGS} ; do
187 # Note this should work with globs like -mcpu=ultrasparc*
188 if [[ ${x} == ${1} ]]; then
189 echo true
190 return 0
191 fi
192 done
193 return 1
194 }
195
196 filter-mfpmath() {
197 local orig_mfpmath new_math prune_math
198
199 # save the original -mfpmath flag
200 orig_mfpmath="`get-flag -mfpmath`"
201 # get the value of the current -mfpmath flag
202 new_math=" `get-flag mfpmath | tr , ' '` "
203 # figure out which math values are to be removed
204 prune_math=""
205 for prune_math in "$@" ; do
206 new_math="${new_math/ ${prune_math} / }"
207 done
208 new_math="`echo ${new_math:1:${#new_math}-2} | tr ' ' ,`"
209
210 if [ -z "${new_math}" ] ; then
211 # if we're removing all user specified math values are
212 # slated for removal, then we just filter the flag
213 filter-flags ${orig_mfpmath}
214 else
215 # if we only want to filter some of the user specified
216 # math values, then we replace the current flag
217 replace-flags ${orig_mfpmath} -mfpmath=${new_math}
218 fi
219 return 0
220 }
221
222 strip-flags() {
223 local x y flag NEW_CFLAGS NEW_CXXFLAGS
224
225 setup-allowed-flags
226
227 local NEW_CFLAGS=""
228 local NEW_CXXFLAGS=""
229
230 # Allow unstable C[XX]FLAGS if we are using unstable profile ...
231 if has ~${ARCH} ${ACCEPT_KEYWORDS} ; then
232 use debug && einfo "Enabling the use of some unstable flags"
233 ALLOWED_FLAGS="${ALLOWED_FLAGS} ${UNSTABLE_FLAGS}"
234 fi
235
236 set -f # disable pathname expansion
237
238 for x in ${CFLAGS}; do
239 for y in ${ALLOWED_FLAGS}; do
240 flag=${x%%=*}
241 if [ "${flag%%${y}}" = "" ] ; then
242 NEW_CFLAGS="${NEW_CFLAGS} ${x}"
243 break
244 fi
245 done
246 done
247
248 for x in ${CXXFLAGS}; do
249 for y in ${ALLOWED_FLAGS}; do
250 flag=${x%%=*}
251 if [ "${flag%%${y}}" = "" ] ; then
252 NEW_CXXFLAGS="${NEW_CXXFLAGS} ${x}"
253 break
254 fi
255 done
256 done
257
258 # In case we filtered out all optimization flags fallback to -O2
259 if [ "${CFLAGS/-O}" != "${CFLAGS}" -a "${NEW_CFLAGS/-O}" = "${NEW_CFLAGS}" ]; then
260 NEW_CFLAGS="${NEW_CFLAGS} -O2"
261 fi
262 if [ "${CXXFLAGS/-O}" != "${CXXFLAGS}" -a "${NEW_CXXFLAGS/-O}" = "${NEW_CXXFLAGS}" ]; then
263 NEW_CXXFLAGS="${NEW_CXXFLAGS} -O2"
264 fi
265
266 set +f # re-enable pathname expansion
267
268 export CFLAGS="${NEW_CFLAGS}"
269 export CXXFLAGS="${NEW_CXXFLAGS}"
270 return 0
271 }
272
273 test_flag() {
274 if $(tc-getCC) -S -xc "$@" -o "$(emktemp)" /dev/null &>/dev/null; then
275 printf "%s\n" "$*"
276 return 0
277 fi
278 return 1
279 }
280
281 test_version_info() {
282 if [[ $($(tc-getCC) --version 2>&1) == *$1* ]]; then
283 return 0
284 else
285 return 1
286 fi
287 }
288
289 strip-unsupported-flags() {
290 local NEW_CFLAGS NEW_CXXFLAGS
291
292 for x in ${CFLAGS} ; do
293 NEW_CFLAGS="${NEW_CFLAGS} `test_flag ${x}`"
294 done
295 for x in ${CXXFLAGS} ; do
296 NEW_CXXFLAGS="${NEW_CXXFLAGS} `test_flag ${x}`"
297 done
298
299 export CFLAGS="${NEW_CFLAGS}"
300 export CXXFLAGS="${NEW_CXXFLAGS}"
301 }
302
303 get-flag() {
304 local f findflag="$1"
305
306 # this code looks a little flaky but seems to work for
307 # everything we want ...
308 # for example, if CFLAGS="-march=i686":
309 # `get-flag -march` == "-march=i686"
310 # `get-flag march` == "i686"
311 for f in ${CFLAGS} ${CXXFLAGS} ; do
312 if [ "${f/${findflag}}" != "${f}" ] ; then
313 printf "%s\n" "${f/-${findflag}=}"
314 return 0
315 fi
316 done
317 return 1
318 }
319
320 has_hardened() {
321 test_version_info Hardened && return 0
322 # the specs file wont exist unless gcc has GCC_SPECS support
323 [ -f "${GCC_SPECS}" -a "${GCC_SPECS}" != "${GCC_SPECS/hardened/}" ] && \
324 return 0
325 return 1
326 }
327
328 # indicate whether PIC is set
329 has_pic() {
330 [ "${CFLAGS/-fPIC}" != "${CFLAGS}" ] && return 0
331 [ "${CFLAGS/-fpic}" != "${CFLAGS}" ] && return 0
332 [ "$(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __PIC__)" ] && return 0
333 test_version_info pie && return 0
334 return 1
335 }
336
337 # indicate whether PIE is set
338 has_pie() {
339 [ "${CFLAGS/-fPIE}" != "${CFLAGS}" ] && return 0
340 [ "${CFLAGS/-fpie}" != "${CFLAGS}" ] && return 0
341 [ "$(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __PIE__)" ] && return 0
342 # test PIC while waiting for specs to be updated to generate __PIE__
343 [ "$(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __PIC__)" ] && return 0
344 return 1
345 }
346
347 # indicate whether code for SSP is being generated
348 has_ssp() {
349 # note; this matches both -fstack-protector and -fstack-protector-all
350 [ "${CFLAGS/-fstack-protector}" != "${CFLAGS}" ] && return 0
351 [ "$(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __SSP__)" ] && return 0
352 return 1
353 }
354
355 has_m64() {
356 # this doesnt test if the flag is accepted, it tests if the flag
357 # actually -WORKS-. non-multilib gcc will take both -m32 and -m64!
358 # please dont replace this function with test_flag in some future
359 # clean-up!
360 local temp="$(emktemp)"
361 echo "int main() { return(0); }" > ${temp}.c
362 MY_CC=$(tc-getCC)
363 ${MY_CC/ .*/} -m64 -o "$(emktemp)" ${temp}.c > /dev/null 2>&1
364 local ret=$?
365 rm -f ${temp}.c
366 [ "$ret" != "1" ] && return 0
367 return 1
368 }
369
370 has_m32() {
371 # this doesnt test if the flag is accepted, it tests if the flag
372 # actually -WORKS-. non-multilib gcc will take both -m32 and -m64!
373 # please dont replace this function with test_flag in some future
374 # clean-up!
375
376 [ "$(tc-arch)" = "amd64" ] && has_multilib_profile && return 0
377
378 local temp="$(emktemp)"
379 echo "int main() { return(0); }" > ${temp}.c
380 MY_CC=$(tc-getCC)
381 ${MY_CC/ .*/} -m32 -o "$(emktemp)" ${temp}.c > /dev/null 2>&1
382 local ret=$?
383 rm -f ${temp}.c
384 [ "$ret" != "1" ] && return 0
385 return 1
386 }
387
388 replace-sparc64-flags() {
389 local SPARC64_CPUS="ultrasparc v9"
390
391 if [ "${CFLAGS/mtune}" != "${CFLAGS}" ]; then
392 for x in ${SPARC64_CPUS}; do
393 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8}"
394 done
395 else
396 for x in ${SPARC64_CPUS}; do
397 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
398 done
399 fi
400
401 if [ "${CXXFLAGS/mtune}" != "${CXXFLAGS}" ]; then
402 for x in ${SPARC64_CPUS}; do
403 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8}"
404 done
405 else
406 for x in ${SPARC64_CPUS}; do
407 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
408 done
409 fi
410
411 export CFLAGS CXXFLAGS
412 }
413
414 append-ldflags() {
415 export LDFLAGS="${LDFLAGS} $*"
416 return 0
417 }
418
419 filter-ldflags() {
420 local x
421
422 # we do this fancy spacing stuff so as to not filter
423 # out part of a flag ... we want flag atoms ! :D
424 LDFLAGS=" ${LDFLAGS} "
425 for x in "$@" ; do
426 LDFLAGS="${LDFLAGS// ${x} / }"
427 done
428 LDFLAGS="${LDFLAGS:1:${#LDFLAGS}-2}"
429 export LDFLAGS
430 return 0
431 }
432
433 etexec-flags() {
434 # if you're not using a hardened compiler you wont need this
435 # PIC/no-pic kludge in the first place.
436 has_hardened || return 0
437 use amd64 && return 0
438 use mips && return 0
439
440 if has_pie || has_pic; then
441 [ -z "`is-flag -fno-pic`" ] &&
442 export CFLAGS="${CFLAGS} `test_flag -fno-pic`"
443 [ -z "`is-flag -nopie`" ] &&
444 export CFLAGS="${CFLAGS} `test_flag -nopie`"
445 fi
446 return 0
447 }
448
449 fstack-flags() {
450 if has_ssp; then
451 [ -z "`is-flag -fno-stack-protector`" ] &&
452 export CFLAGS="${CFLAGS} `test_flag -fno-stack-protector`"
453 fi
454 return 0
455 }
456
457 # This is thanks to great work from Paul de Vrieze <gentoo-user@devrieze.net>,
458 # bug #9016. Also thanks to Jukka Salmi <salmi@gmx.net> (bug #13907) for more
459 # fixes.
460 #
461 # Export CFLAGS and CXXFLAGS that are compadible with gcc-2.95.3
462 gcc2-flags() {
463 CFLAGS=${CFLAGS//pentium-mmx/i586}
464 CFLAGS=${CFLAGS//pentium[234]/i686}
465 CFLAGS=${CFLAGS//k6-[23]/k6}
466 CFLAGS=${CFLAGS//athlon-tbird/i686}
467 CFLAGS=${CFLAGS//athlon-4/i686}
468 CFLAGS=${CFLAGS//athlon-[xm]p/i686}
469 CFLAGS=${CFLAGS//athlon/i686}
470
471 CXXFLAGS=${CXXFLAGS//pentium-mmx/i586}
472 CXXFLAGS=${CXXFLAGS//pentium[234]/i686}
473 CXXFLAGS=${CXXFLAGS//k6-[23]/k6}
474 CXXFLAGS=${CXXFLAGS//athlon-tbird/i686}
475 CXXFLAGS=${CXXFLAGS//athlon-4/i686}
476 CXXFLAGS=${CXXFLAGS//athlon-[xm]p/i686}
477 CXXFLAGS=${CXXFLAGS//athlon/i686}
478
479 if [ "$ARCH" = alpha ]; then
480 CHOST=${CHOST/#alphaev6[78]/alphaev6}
481 CFLAGS=${CFLAGS//ev6[78]/ev6}
482 CXXFLAGS=${CXXFLAGS//ev6[78]/ev6}
483 fi
484
485 export CFLAGS CXXFLAGS
486 }

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