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Revision 1.76 - (show annotations) (download)
Sat Oct 30 00:00:14 2004 UTC (9 years, 9 months ago) by vapier
Branch: MAIN
Changes since 1.75: +6 -2 lines
allow debugging flags through strip-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 1.75 2004/10/28 01:38:31 vapier 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
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 esac
89 fi
90 # allow a bunch of flags that negate features / control ABI
91 ALLOWED_FLAGS="${ALLOWED_FLAGS} -fno-stack-protector -fno-stack-protector-all"
92 case "${ARCH}" in
93 x86|amd64|ia64) ALLOWED_FLAGS="${ALLOWED_FLAGS} -mno-mmx -mno-sse -mno-sse2 -mno-sse3 -mno-3dnow" ;;
94 esac
95 ALLOWED_FLAGS="${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"
96
97 # C[XX]FLAGS that we are think is ok, but needs testing
98 # NOTE: currently -Os have issues with gcc3 and K6* arch's
99 export UNSTABLE_FLAGS="-Os -O3 -freorder-blocks -fprefetch-loop-arrays"
100 return 0
101 }
102
103 filter-flags() {
104 local x f fset
105 declare -a new_CFLAGS new_CXXFLAGS
106
107 for x in "$@" ; do
108 case "${x}" in
109 -fPIC|-fpic|-fPIE|-fpie|-pie) etexec-flags;;
110 -fstack-protector|-fstack-protector-all) fstack-flags;;
111 esac
112 done
113
114 for fset in CFLAGS CXXFLAGS; do
115 # Looping over the flags instead of using a global
116 # substitution ensures that we're working with flag atoms.
117 # Otherwise globs like -O* have the potential to wipe out the
118 # list of flags.
119 for f in ${!fset}; do
120 for x in "$@"; do
121 # Note this should work with globs like -O*
122 [[ ${f} == ${x} ]] && continue 2
123 done
124 eval new_${fset}\[\${\#new_${fset}\[@]}]=\${f}
125 done
126 eval export ${fset}=\${new_${fset}\[*]}
127 done
128
129 return 0
130 }
131
132 filter-lfs-flags() {
133 filter-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
134 }
135
136 append-lfs-flags() {
137 append-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
138 }
139
140 append-flags() {
141 export CFLAGS="${CFLAGS} $*"
142 export CXXFLAGS="${CXXFLAGS} $*"
143 [ -n "`is-flag -fno-stack-protector`" -o \
144 -n "`is-flag -fno-stack-protector-all`" ] && fstack-flags
145 return 0
146 }
147
148 replace-flags() {
149 local f fset
150 declare -a new_CFLAGS new_CXXFLAGS
151
152 for fset in CFLAGS CXXFLAGS; do
153 # Looping over the flags instead of using a global
154 # substitution ensures that we're working with flag atoms.
155 # Otherwise globs like -O* have the potential to wipe out the
156 # list of flags.
157 for f in ${!fset}; do
158 # Note this should work with globs like -O*
159 [[ ${f} == ${1} ]] && f=${2}
160 eval new_${fset}\[\${\#new_${fset}\[@]}]=\${f}
161 done
162 eval export ${fset}=\${new_${fset}\[*]}
163 done
164
165 return 0
166 }
167
168 replace-cpu-flags() {
169 local newcpu="$#" ; newcpu="${!newcpu}"
170 while [ $# -gt 1 ] ; do
171 # quote to make sure that no globbing is done (particularly on
172 # ${oldcpu} prior to calling replace-flags
173 replace-flags "-march=${1}" "-march=${newcpu}"
174 replace-flags "-mcpu=${1}" "-mcpu=${newcpu}"
175 replace-flags "-mtune=${1}" "-mtune=${newcpu}"
176 shift
177 done
178 return 0
179 }
180
181 is-flag() {
182 local x
183
184 for x in ${CFLAGS} ${CXXFLAGS} ; do
185 # Note this should work with globs like -mcpu=ultrasparc*
186 if [[ ${x} == ${1} ]]; then
187 echo true
188 return 0
189 fi
190 done
191 return 1
192 }
193
194 filter-mfpmath() {
195 local orig_mfpmath new_math prune_math
196
197 # save the original -mfpmath flag
198 orig_mfpmath="`get-flag -mfpmath`"
199 # get the value of the current -mfpmath flag
200 new_math=" `get-flag mfpmath | tr , ' '` "
201 # figure out which math values are to be removed
202 prune_math=""
203 for prune_math in "$@" ; do
204 new_math="${new_math/ ${prune_math} / }"
205 done
206 new_math="`echo ${new_math:1:${#new_math}-2} | tr ' ' ,`"
207
208 if [ -z "${new_math}" ] ; then
209 # if we're removing all user specified math values are
210 # slated for removal, then we just filter the flag
211 filter-flags ${orig_mfpmath}
212 else
213 # if we only want to filter some of the user specified
214 # math values, then we replace the current flag
215 replace-flags ${orig_mfpmath} -mfpmath=${new_math}
216 fi
217 return 0
218 }
219
220 strip-flags() {
221 local x y flag NEW_CFLAGS NEW_CXXFLAGS
222
223 setup-allowed-flags
224
225 local NEW_CFLAGS=""
226 local NEW_CXXFLAGS=""
227
228 # Allow unstable C[XX]FLAGS if we are using unstable profile ...
229 if has ~${ARCH} ${ACCEPT_KEYWORDS} ; then
230 use debug && einfo "Enabling the use of some unstable flags"
231 ALLOWED_FLAGS="${ALLOWED_FLAGS} ${UNSTABLE_FLAGS}"
232 fi
233
234 set -f # disable pathname expansion
235
236 for x in ${CFLAGS}; do
237 for y in ${ALLOWED_FLAGS}; do
238 flag=${x%%=*}
239 if [ "${flag%%${y}}" = "" ] ; then
240 NEW_CFLAGS="${NEW_CFLAGS} ${x}"
241 break
242 fi
243 done
244 done
245
246 for x in ${CXXFLAGS}; do
247 for y in ${ALLOWED_FLAGS}; do
248 flag=${x%%=*}
249 if [ "${flag%%${y}}" = "" ] ; then
250 NEW_CXXFLAGS="${NEW_CXXFLAGS} ${x}"
251 break
252 fi
253 done
254 done
255
256 # In case we filtered out all optimization flags fallback to -O2
257 if [ "${CFLAGS/-O}" != "${CFLAGS}" -a "${NEW_CFLAGS/-O}" = "${NEW_CFLAGS}" ]; then
258 NEW_CFLAGS="${NEW_CFLAGS} -O2"
259 fi
260 if [ "${CXXFLAGS/-O}" != "${CXXFLAGS}" -a "${NEW_CXXFLAGS/-O}" = "${NEW_CXXFLAGS}" ]; then
261 NEW_CXXFLAGS="${NEW_CXXFLAGS} -O2"
262 fi
263
264 set +f # re-enable pathname expansion
265
266 export CFLAGS="${NEW_CFLAGS}"
267 export CXXFLAGS="${NEW_CXXFLAGS}"
268 return 0
269 }
270
271 test_flag() {
272 if $(tc-getCC) -S -xc "$@" -o "$(emktemp)" /dev/null &>/dev/null; then
273 printf "%s\n" "$*"
274 return 0
275 fi
276 return 1
277 }
278
279 test_version_info() {
280 if [[ $($(tc-getCC) --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); }" > ${temp}.c
353 MY_CC=$(tc-getCC)
354 ${MY_CC/ .*/} -m64 -o "$(emktemp)" ${temp}.c > /dev/null 2>&1
355 local ret=$?
356 rm -f ${temp}.c
357 [ "$ret" != "1" ] && return 0
358 return 1
359 }
360
361 has_m32() {
362 # this doesnt test if the flag is accepted, it tests if the flag
363 # actually -WORKS-. non-multilib gcc will take both -m32 and -m64!
364 # please dont replace this function with test_flag in some future
365 # clean-up!
366 local temp="$(emktemp)"
367 echo "int main() { return(0); }" > ${temp}.c
368 MY_CC=$(tc-getCC)
369 ${MY_CC/ .*/} -m32 -o "$(emktemp)" ${temp}.c > /dev/null 2>&1
370 local ret=$?
371 rm -f ${temp}.c
372 [ "$ret" != "1" ] && return 0
373 return 1
374 }
375
376 replace-sparc64-flags() {
377 local SPARC64_CPUS="ultrasparc v9"
378
379 if [ "${CFLAGS/mtune}" != "${CFLAGS}" ]; then
380 for x in ${SPARC64_CPUS}; do
381 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8}"
382 done
383 else
384 for x in ${SPARC64_CPUS}; do
385 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
386 done
387 fi
388
389 if [ "${CXXFLAGS/mtune}" != "${CXXFLAGS}" ]; then
390 for x in ${SPARC64_CPUS}; do
391 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8}"
392 done
393 else
394 for x in ${SPARC64_CPUS}; do
395 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
396 done
397 fi
398
399 export CFLAGS CXXFLAGS
400 }
401
402 append-ldflags() {
403 export LDFLAGS="${LDFLAGS} $*"
404 return 0
405 }
406
407 filter-ldflags() {
408 local x
409
410 # we do this fancy spacing stuff so as to not filter
411 # out part of a flag ... we want flag atoms ! :D
412 LDFLAGS=" ${LDFLAGS} "
413 for x in "$@" ; do
414 LDFLAGS="${LDFLAGS// ${x} / }"
415 done
416 LDFLAGS="${LDFLAGS:1:${#LDFLAGS}-2}"
417 export LDFLAGS
418 return 0
419 }
420
421 etexec-flags() {
422 # if you're not using a hardened compiler you wont need this
423 # PIC/no-pic kludge in the first place.
424 has_hardened || return 0
425 # this kludge breaks on amd64, and probably other -fPIC dependant
426 # archs.
427 use amd64 && return 0
428
429 if has_pie || has_pic; then
430 [ -z "`is-flag -fno-pic`" ] &&
431 export CFLAGS="${CFLAGS} `test_flag -fno-pic`"
432 [ -z "`is-flag -nopie`" ] &&
433 export CFLAGS="${CFLAGS} `test_flag -nopie`"
434 fi
435 return 0
436 }
437
438 fstack-flags() {
439 if has_ssp; then
440 [ -z "`is-flag -fno-stack-protector`" ] &&
441 export CFLAGS="${CFLAGS} `test_flag -fno-stack-protector`"
442 fi
443 return 0
444 }
445
446 # This is thanks to great work from Paul de Vrieze <gentoo-user@devrieze.net>,
447 # bug #9016. Also thanks to Jukka Salmi <salmi@gmx.net> (bug #13907) for more
448 # fixes.
449 #
450 # Export CFLAGS and CXXFLAGS that are compadible with gcc-2.95.3
451 gcc2-flags() {
452 CFLAGS=${CFLAGS//pentium-mmx/i586}
453 CFLAGS=${CFLAGS//pentium[234]/i686}
454 CFLAGS=${CFLAGS//k6-[23]/k6}
455 CFLAGS=${CFLAGS//athlon-tbird/i686}
456 CFLAGS=${CFLAGS//athlon-4/i686}
457 CFLAGS=${CFLAGS//athlon-[xm]p/i686}
458 CFLAGS=${CFLAGS//athlon/i686}
459
460 CXXFLAGS=${CXXFLAGS//pentium-mmx/i586}
461 CXXFLAGS=${CXXFLAGS//pentium[234]/i686}
462 CXXFLAGS=${CXXFLAGS//k6-[23]/k6}
463 CXXFLAGS=${CXXFLAGS//athlon-tbird/i686}
464 CXXFLAGS=${CXXFLAGS//athlon-4/i686}
465 CXXFLAGS=${CXXFLAGS//athlon-[xm]p/i686}
466 CXXFLAGS=${CXXFLAGS//athlon/i686}
467
468 if [ "$ARCH" = alpha ]; then
469 CHOST=${CHOST/#alphaev6[78]/alphaev6}
470 CFLAGS=${CFLAGS//ev6[78]/ev6}
471 CXXFLAGS=${CXXFLAGS//ev6[78]/ev6}
472 fi
473
474 export CFLAGS CXXFLAGS
475 }

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