/[gentoo-x86]/eclass/flag-o-matic.eclass
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Revision 1.87 - (show annotations) (download)
Fri Jun 24 22:06:19 2005 UTC (9 years, 2 months ago) by vapier
Branch: MAIN
Changes since 1.86: +10 -18 lines
remove pointless USE=debug usage and move all the ABI flags into shared setup

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 1.86 2005/04/28 20:06:00 solar Exp $
4
5 ECLASS=flag-o-matic
6 INHERITED="$INHERITED $ECLASS"
7
8 # need access to emktemp()
9 inherit eutils toolchain-funcs multilib
10
11 #
12 #### filter-flags <flags> ####
13 # Remove particular flags from C[XX]FLAGS
14 # Matches only complete flags
15 #
16 #### append-flags <flags> ####
17 # Add extra flags to your current C[XX]FLAGS
18 #
19 #### replace-flags <orig.flag> <new.flag> ###
20 # Replace a flag by another one
21 #
22 #### replace-cpu-flags <old.cpus> <new.cpu> ###
23 # Replace march/mcpu flags that specify <old.cpus>
24 # with flags that specify <new.cpu>
25 #
26 #### is-flag <flag> ####
27 # Returns "true" if flag is set in C[XX]FLAGS
28 # Matches only complete a flag
29 #
30 #### strip-flags ####
31 # Strip C[XX]FLAGS of everything except known
32 # good options.
33 #
34 #### strip-unsupported-flags ####
35 # Strip C[XX]FLAGS of any flags not supported by
36 # installed version of gcc
37 #
38 #### get-flag <flag> ####
39 # Find and echo the value for a particular flag
40 #
41 #### replace-sparc64-flags ####
42 # Sets mcpu to v8 and uses the original value
43 # as mtune if none specified.
44 #
45 #### filter-mfpmath <math types> ####
46 # Remove specified math types from the fpmath specification
47 # If the user has -mfpmath=sse,386, running `filter-mfpmath sse`
48 # will leave the user with -mfpmath=386
49 #
50 #### append-ldflags ####
51 # Add extra flags to your current LDFLAGS
52 #
53 #### filter-ldflags <flags> ####
54 # Remove particular flags from LDFLAGS
55 # Matches only complete flags
56 #
57 #### fstack-flags ####
58 # hooked function for hardened gcc that appends
59 # -fno-stack-protector to {C,CXX,LD}FLAGS
60 # when a package is filtering -fstack-protector, -fstack-protector-all
61 # notice: modern automatic specs files will also suppress -fstack-protector-all
62 # when only -fno-stack-protector is given
63 #
64 #### has_pic ####
65 # Returns true if the compiler by default or with current CFLAGS
66 # builds position-independent code.
67 #
68 #### has_ssp_all ####
69 # Returns true if the compiler by default or with current CFLAGS
70 # generates stack smash protections for all functions
71 #
72 #### has_ssp ####
73 # Returns true if the compiler by default or with current CFLAGS
74 # generates stack smash protections for most vulnerable functions
75 #
76
77 # C[XX]FLAGS that we allow in strip-flags
78 setup-allowed-flags() {
79 if [[ -z ${ALLOWED_FLAGS} ]] ; then
80 export ALLOWED_FLAGS="-pipe"
81 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -O -O0 -O1 -O2 -mcpu -march -mtune"
82 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -fstack-protector -fstack-protector-all"
83 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -fbounds-checking -fno-bounds-checking"
84 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -fno-pie -fno-unit-at-a-time"
85 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -g -g0 -g1 -g2 -g3 -ggdb -ggdb0 -ggdb1 -ggdb2 -ggdb3"
86 fi
87 # allow a bunch of flags that negate features / control ABI
88 ALLOWED_FLAGS="${ALLOWED_FLAGS} -fno-stack-protector -fno-stack-protector-all"
89 ALLOWED_FLAGS="${ALLOWED_FLAGS} -mregparm -mno-app-regs -mapp-regs \
90 -mno-mmx -mno-sse -mno-sse2 -mno-sse3 -mno-3dnow \
91 -mips1 -mips2 -mips3 -mips4 -mips32 -mips64 -mips16 \
92 -msoft-float -mno-soft-float -mhard-float -mno-hard-float -mfpu \
93 -mflat -mno-flat -mno-faster-structs -mfaster-structs \
94 -m32 -m64 -mabi -mlittle-endian -mbig-endian -EL -EB -fPIC \
95 -mlive-g0 -mcmodel -mstack-bias -mno-stack-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)
110 append-flags `test_flag -fno-pie`;;
111 -fstack-protector|-fstack-protector-all)
112 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 [[ -z $* ]] && return 0
144 export CFLAGS="${CFLAGS} $*"
145 export CXXFLAGS="${CXXFLAGS} $*"
146 [ -n "`is-flag -fno-stack-protector`" -o \
147 -n "`is-flag -fno-stack-protector-all`" ] && fstack-flags
148 return 0
149 }
150
151 replace-flags() {
152 local f fset
153 declare -a new_CFLAGS new_CXXFLAGS
154
155 for fset in CFLAGS CXXFLAGS; do
156 # Looping over the flags instead of using a global
157 # substitution ensures that we're working with flag atoms.
158 # Otherwise globs like -O* have the potential to wipe out the
159 # list of flags.
160 for f in ${!fset}; do
161 # Note this should work with globs like -O*
162 [[ ${f} == ${1} ]] && f=${2}
163 eval new_${fset}\[\${\#new_${fset}\[@]}]=\${f}
164 done
165 eval export ${fset}=\${new_${fset}\[*]}
166 done
167
168 return 0
169 }
170
171 replace-cpu-flags() {
172 local newcpu="$#" ; newcpu="${!newcpu}"
173 while [ $# -gt 1 ] ; do
174 # quote to make sure that no globbing is done (particularly on
175 # ${oldcpu} prior to calling replace-flags
176 replace-flags "-march=${1}" "-march=${newcpu}"
177 replace-flags "-mcpu=${1}" "-mcpu=${newcpu}"
178 replace-flags "-mtune=${1}" "-mtune=${newcpu}"
179 shift
180 done
181 return 0
182 }
183
184 is-flag() {
185 local x
186
187 for x in ${CFLAGS} ${CXXFLAGS} ; do
188 # Note this should work with globs like -mcpu=ultrasparc*
189 if [[ ${x} == ${1} ]]; then
190 echo true
191 return 0
192 fi
193 done
194 return 1
195 }
196
197 filter-mfpmath() {
198 local orig_mfpmath new_math prune_math
199
200 # save the original -mfpmath flag
201 orig_mfpmath="`get-flag -mfpmath`"
202 # get the value of the current -mfpmath flag
203 new_math=" `get-flag mfpmath | tr , ' '` "
204 # figure out which math values are to be removed
205 prune_math=""
206 for prune_math in "$@" ; do
207 new_math="${new_math/ ${prune_math} / }"
208 done
209 new_math="`echo ${new_math:1:${#new_math}-2} | tr ' ' ,`"
210
211 if [ -z "${new_math}" ] ; then
212 # if we're removing all user specified math values are
213 # slated for removal, then we just filter the flag
214 filter-flags ${orig_mfpmath}
215 else
216 # if we only want to filter some of the user specified
217 # math values, then we replace the current flag
218 replace-flags ${orig_mfpmath} -mfpmath=${new_math}
219 fi
220 return 0
221 }
222
223 strip-flags() {
224 local x y flag NEW_CFLAGS NEW_CXXFLAGS
225
226 setup-allowed-flags
227
228 local NEW_CFLAGS=""
229 local NEW_CXXFLAGS=""
230
231 # Allow unstable C[XX]FLAGS if we are using unstable profile ...
232 if has ~$(tc-arch) ${ACCEPT_KEYWORDS} ; then
233 ALLOWED_FLAGS="${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) ${CFLAGS} -E -dM - | grep __PIC__)" ] && return 0
333 return 1
334 }
335
336 # indicate whether PIE is set
337 has_pie() {
338 [ "${CFLAGS/-fPIE}" != "${CFLAGS}" ] && return 0
339 [ "${CFLAGS/-fpie}" != "${CFLAGS}" ] && return 0
340 [ "$(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __PIE__)" ] && return 0
341 # test PIC while waiting for specs to be updated to generate __PIE__
342 [ "$(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __PIC__)" ] && return 0
343 return 1
344 }
345
346 # indicate whether code for SSP is being generated for all functions
347 has_ssp_all() {
348 # note; this matches only -fstack-protector-all
349 [ "${CFLAGS/-fstack-protector-all}" != "${CFLAGS}" ] && return 0
350 [ "$(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __SSP_ALL__)" ] && return 0
351 return 1
352 }
353
354 # indicate whether code for SSP is being generated
355 has_ssp() {
356 # note; this matches both -fstack-protector and -fstack-protector-all
357 [ "${CFLAGS/-fstack-protector}" != "${CFLAGS}" ] && return 0
358 [ "$(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __SSP__)" ] && return 0
359 return 1
360 }
361
362 has_m64() {
363 # this doesnt test if the flag is accepted, it tests if the flag
364 # actually -WORKS-. non-multilib gcc will take both -m32 and -m64!
365 # please dont replace this function with test_flag in some future
366 # clean-up!
367 local temp="$(emktemp)"
368 echo "int main() { return(0); }" > ${temp}.c
369 MY_CC=$(tc-getCC)
370 ${MY_CC/ .*/} -m64 -o "$(emktemp)" ${temp}.c > /dev/null 2>&1
371 local ret=$?
372 rm -f ${temp}.c
373 [ "$ret" != "1" ] && return 0
374 return 1
375 }
376
377 has_m32() {
378 # this doesnt test if the flag is accepted, it tests if the flag
379 # actually -WORKS-. non-multilib gcc will take both -m32 and -m64!
380 # please dont replace this function with test_flag in some future
381 # clean-up!
382
383 [ "$(tc-arch)" = "amd64" ] && has_multilib_profile && return 0
384
385 local temp="$(emktemp)"
386 echo "int main() { return(0); }" > ${temp}.c
387 MY_CC=$(tc-getCC)
388 ${MY_CC/ .*/} -m32 -o "$(emktemp)" ${temp}.c > /dev/null 2>&1
389 local ret=$?
390 rm -f ${temp}.c
391 [ "$ret" != "1" ] && return 0
392 return 1
393 }
394
395 replace-sparc64-flags() {
396 local SPARC64_CPUS="ultrasparc v9"
397
398 if [ "${CFLAGS/mtune}" != "${CFLAGS}" ]; then
399 for x in ${SPARC64_CPUS}; do
400 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8}"
401 done
402 else
403 for x in ${SPARC64_CPUS}; do
404 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
405 done
406 fi
407
408 if [ "${CXXFLAGS/mtune}" != "${CXXFLAGS}" ]; then
409 for x in ${SPARC64_CPUS}; do
410 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8}"
411 done
412 else
413 for x in ${SPARC64_CPUS}; do
414 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
415 done
416 fi
417
418 export CFLAGS CXXFLAGS
419 }
420
421 append-ldflags() {
422 export LDFLAGS="${LDFLAGS} $*"
423 return 0
424 }
425
426 filter-ldflags() {
427 local x
428
429 # we do this fancy spacing stuff so as to not filter
430 # out part of a flag ... we want flag atoms ! :D
431 LDFLAGS=" ${LDFLAGS} "
432 for x in "$@" ; do
433 LDFLAGS=${LDFLAGS// ${x} / }
434 done
435 [[ -z ${LDFLAGS// } ]] \
436 && LDFLAGS="" \
437 || LDFLAGS=${LDFLAGS:1:${#LDFLAGS}-2}
438 export LDFLAGS
439 return 0
440 }
441
442 fstack-flags() {
443 if has_ssp; then
444 [ -z "`is-flag -fno-stack-protector`" ] &&
445 export CFLAGS="${CFLAGS} `test_flag -fno-stack-protector`"
446 fi
447 return 0
448 }
449
450 # This is thanks to great work from Paul de Vrieze <gentoo-user@devrieze.net>,
451 # bug #9016. Also thanks to Jukka Salmi <salmi@gmx.net> (bug #13907) for more
452 # fixes.
453 #
454 # Export CFLAGS and CXXFLAGS that are compadible with gcc-2.95.3
455 gcc2-flags() {
456 if [[ $(tc-arch) == "x86" || $(tc-arch) == "amd64" ]] ; then
457 CFLAGS=${CFLAGS//-mtune=/-mcpu=}
458 CXXFLAGS=${CXXFLAGS//-mtune=/-mcpu=}
459 fi
460
461 replace-cpu-flags k6-{2,3} k6
462 replace-cpu-flags athlon{,-{tbird,4,xp,mp}} i686
463
464 replace-cpu-flags pentium-mmx i586
465 replace-cpu-flags pentium{2,3,4} i686
466
467 replace-cpu-flags ev6{7,8} ev6
468
469 export CFLAGS CXXFLAGS
470 }

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