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Revision 1.89 - (show annotations) (download)
Wed Jul 6 20:23:20 2005 UTC (9 years ago) by agriffis
Branch: MAIN
Changes since 1.88: +1 -2 lines
Remove ECLASS= and INHERITED= which haven't been necessary for a long time now

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 1.88 2005/07/06 20:20:03 agriffis Exp $
4
5
6 # need access to emktemp()
7 inherit eutils toolchain-funcs multilib
8
9 #
10 #### filter-flags <flags> ####
11 # Remove particular flags from C[XX]FLAGS
12 # Matches only complete flags
13 #
14 #### append-flags <flags> ####
15 # Add extra flags to your current C[XX]FLAGS
16 #
17 #### replace-flags <orig.flag> <new.flag> ###
18 # Replace a flag by another one
19 #
20 #### replace-cpu-flags <old.cpus> <new.cpu> ###
21 # Replace march/mcpu flags that specify <old.cpus>
22 # with flags that specify <new.cpu>
23 #
24 #### is-flag <flag> ####
25 # Returns "true" if flag is set in C[XX]FLAGS
26 # Matches only complete a flag
27 #
28 #### strip-flags ####
29 # Strip C[XX]FLAGS of everything except known
30 # good options.
31 #
32 #### strip-unsupported-flags ####
33 # Strip C[XX]FLAGS of any flags not supported by
34 # installed version of gcc
35 #
36 #### get-flag <flag> ####
37 # Find and echo the value for a particular flag
38 #
39 #### replace-sparc64-flags ####
40 # Sets mcpu to v8 and uses the original value
41 # as mtune if none specified.
42 #
43 #### filter-mfpmath <math types> ####
44 # Remove specified math types from the fpmath specification
45 # If the user has -mfpmath=sse,386, running `filter-mfpmath sse`
46 # will leave the user with -mfpmath=386
47 #
48 #### append-ldflags ####
49 # Add extra flags to your current LDFLAGS
50 #
51 #### filter-ldflags <flags> ####
52 # Remove particular flags from LDFLAGS
53 # Matches only complete flags
54 #
55 #### fstack-flags ####
56 # hooked function for hardened gcc that appends
57 # -fno-stack-protector to {C,CXX,LD}FLAGS
58 # when a package is filtering -fstack-protector, -fstack-protector-all
59 # notice: modern automatic specs files will also suppress -fstack-protector-all
60 # when only -fno-stack-protector is given
61 #
62 #### has_pic ####
63 # Returns true if the compiler by default or with current CFLAGS
64 # builds position-independent code.
65 #
66 #### has_ssp_all ####
67 # Returns true if the compiler by default or with current CFLAGS
68 # generates stack smash protections for all functions
69 #
70 #### has_ssp ####
71 # Returns true if the compiler by default or with current CFLAGS
72 # generates stack smash protections for most vulnerable functions
73 #
74
75 # C[XX]FLAGS that we allow in strip-flags
76 setup-allowed-flags() {
77 if [[ -z ${ALLOWED_FLAGS} ]] ; then
78 export ALLOWED_FLAGS="-pipe"
79 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -O -O0 -O1 -O2 -mcpu -march -mtune"
80 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -fstack-protector -fstack-protector-all"
81 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -fbounds-checking -fno-bounds-checking"
82 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -fno-pie -fno-unit-at-a-time"
83 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -g -g0 -g1 -g2 -g3 -ggdb -ggdb0 -ggdb1 -ggdb2 -ggdb3"
84 fi
85 # allow a bunch of flags that negate features / control ABI
86 ALLOWED_FLAGS="${ALLOWED_FLAGS} -fno-stack-protector -fno-stack-protector-all"
87 ALLOWED_FLAGS="${ALLOWED_FLAGS} -mregparm -mno-app-regs -mapp-regs \
88 -mno-mmx -mno-sse -mno-sse2 -mno-sse3 -mno-3dnow \
89 -mips1 -mips2 -mips3 -mips4 -mips32 -mips64 -mips16 \
90 -msoft-float -mno-soft-float -mhard-float -mno-hard-float -mfpu \
91 -mflat -mno-flat -mno-faster-structs -mfaster-structs \
92 -m32 -m64 -mabi -mlittle-endian -mbig-endian -EL -EB -fPIC \
93 -mlive-g0 -mcmodel -mstack-bias -mno-stack-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)
108 append-flags `test_flag -fno-pie`;;
109 -fstack-protector|-fstack-protector-all)
110 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 [[ -z $* ]] && return 0
142 export CFLAGS="${CFLAGS} $*"
143 export CXXFLAGS="${CXXFLAGS} $*"
144 [ -n "`is-flag -fno-stack-protector`" -o \
145 -n "`is-flag -fno-stack-protector-all`" ] && fstack-flags
146 return 0
147 }
148
149 replace-flags() {
150 local f fset
151 declare -a new_CFLAGS new_CXXFLAGS
152
153 for fset in CFLAGS CXXFLAGS; do
154 # Looping over the flags instead of using a global
155 # substitution ensures that we're working with flag atoms.
156 # Otherwise globs like -O* have the potential to wipe out the
157 # list of flags.
158 for f in ${!fset}; do
159 # Note this should work with globs like -O*
160 [[ ${f} == ${1} ]] && f=${2}
161 eval new_${fset}\[\${\#new_${fset}\[@]}]=\${f}
162 done
163 eval export ${fset}=\${new_${fset}\[*]}
164 done
165
166 return 0
167 }
168
169 replace-cpu-flags() {
170 local newcpu="$#" ; newcpu="${!newcpu}"
171 while [ $# -gt 1 ] ; do
172 # quote to make sure that no globbing is done (particularly on
173 # ${oldcpu} prior to calling replace-flags
174 replace-flags "-march=${1}" "-march=${newcpu}"
175 replace-flags "-mcpu=${1}" "-mcpu=${newcpu}"
176 replace-flags "-mtune=${1}" "-mtune=${newcpu}"
177 shift
178 done
179 return 0
180 }
181
182 is-flag() {
183 local x
184
185 for x in ${CFLAGS} ${CXXFLAGS} ; do
186 # Note this should work with globs like -mcpu=ultrasparc*
187 if [[ ${x} == ${1} ]]; then
188 echo true
189 return 0
190 fi
191 done
192 return 1
193 }
194
195 filter-mfpmath() {
196 local orig_mfpmath new_math prune_math
197
198 # save the original -mfpmath flag
199 orig_mfpmath="`get-flag -mfpmath`"
200 # get the value of the current -mfpmath flag
201 new_math=" `get-flag mfpmath | tr , ' '` "
202 # figure out which math values are to be removed
203 prune_math=""
204 for prune_math in "$@" ; do
205 new_math="${new_math/ ${prune_math} / }"
206 done
207 new_math="`echo ${new_math:1:${#new_math}-2} | tr ' ' ,`"
208
209 if [ -z "${new_math}" ] ; then
210 # if we're removing all user specified math values are
211 # slated for removal, then we just filter the flag
212 filter-flags ${orig_mfpmath}
213 else
214 # if we only want to filter some of the user specified
215 # math values, then we replace the current flag
216 replace-flags ${orig_mfpmath} -mfpmath=${new_math}
217 fi
218 return 0
219 }
220
221 strip-flags() {
222 local x y flag NEW_CFLAGS NEW_CXXFLAGS
223
224 setup-allowed-flags
225
226 local NEW_CFLAGS=""
227 local NEW_CXXFLAGS=""
228
229 # Allow unstable C[XX]FLAGS if we are using unstable profile ...
230 if has ~$(tc-arch) ${ACCEPT_KEYWORDS} ; then
231 ALLOWED_FLAGS="${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}" != "${GCC_SPECS/hardened/}" ] && \
322 return 0
323 return 1
324 }
325
326 # indicate whether PIC is set
327 has_pic() {
328 [ "${CFLAGS/-fPIC}" != "${CFLAGS}" ] && return 0
329 [ "${CFLAGS/-fpic}" != "${CFLAGS}" ] && return 0
330 [ "$(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __PIC__)" ] && return 0
331 return 1
332 }
333
334 # indicate whether PIE is set
335 has_pie() {
336 [ "${CFLAGS/-fPIE}" != "${CFLAGS}" ] && return 0
337 [ "${CFLAGS/-fpie}" != "${CFLAGS}" ] && return 0
338 [ "$(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __PIE__)" ] && return 0
339 # test PIC while waiting for specs to be updated to generate __PIE__
340 [ "$(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __PIC__)" ] && return 0
341 return 1
342 }
343
344 # indicate whether code for SSP is being generated for all functions
345 has_ssp_all() {
346 # note; this matches only -fstack-protector-all
347 [ "${CFLAGS/-fstack-protector-all}" != "${CFLAGS}" ] && return 0
348 [ "$(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __SSP_ALL__)" ] && return 0
349 return 1
350 }
351
352 # indicate whether code for SSP is being generated
353 has_ssp() {
354 # note; this matches both -fstack-protector and -fstack-protector-all
355 [ "${CFLAGS/-fstack-protector}" != "${CFLAGS}" ] && return 0
356 [ "$(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __SSP__)" ] && return 0
357 return 1
358 }
359
360 has_m64() {
361 # this doesnt test if the flag is accepted, it tests if the flag
362 # actually -WORKS-. non-multilib gcc will take both -m32 and -m64!
363 # please dont replace this function with test_flag in some future
364 # clean-up!
365 local temp="$(emktemp)"
366 echo "int main() { return(0); }" > ${temp}.c
367 MY_CC=$(tc-getCC)
368 ${MY_CC/ .*/} -m64 -o "$(emktemp)" ${temp}.c > /dev/null 2>&1
369 local ret=$?
370 rm -f ${temp}.c
371 [ "$ret" != "1" ] && return 0
372 return 1
373 }
374
375 has_m32() {
376 # this doesnt test if the flag is accepted, it tests if the flag
377 # actually -WORKS-. non-multilib gcc will take both -m32 and -m64!
378 # please dont replace this function with test_flag in some future
379 # clean-up!
380
381 [ "$(tc-arch)" = "amd64" ] && has_multilib_profile && return 0
382
383 local temp="$(emktemp)"
384 echo "int main() { return(0); }" > ${temp}.c
385 MY_CC=$(tc-getCC)
386 ${MY_CC/ .*/} -m32 -o "$(emktemp)" ${temp}.c > /dev/null 2>&1
387 local ret=$?
388 rm -f ${temp}.c
389 [ "$ret" != "1" ] && return 0
390 return 1
391 }
392
393 replace-sparc64-flags() {
394 local SPARC64_CPUS="ultrasparc v9"
395
396 if [ "${CFLAGS/mtune}" != "${CFLAGS}" ]; then
397 for x in ${SPARC64_CPUS}; do
398 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8}"
399 done
400 else
401 for x in ${SPARC64_CPUS}; do
402 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
403 done
404 fi
405
406 if [ "${CXXFLAGS/mtune}" != "${CXXFLAGS}" ]; then
407 for x in ${SPARC64_CPUS}; do
408 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8}"
409 done
410 else
411 for x in ${SPARC64_CPUS}; do
412 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
413 done
414 fi
415
416 export CFLAGS CXXFLAGS
417 }
418
419 append-ldflags() {
420 export LDFLAGS="${LDFLAGS} $*"
421 return 0
422 }
423
424 filter-ldflags() {
425 local x
426
427 # we do this fancy spacing stuff so as to not filter
428 # out part of a flag ... we want flag atoms ! :D
429 LDFLAGS=" ${LDFLAGS} "
430 for x in "$@" ; do
431 LDFLAGS=${LDFLAGS// ${x} / }
432 done
433 [[ -z ${LDFLAGS// } ]] \
434 && LDFLAGS="" \
435 || LDFLAGS=${LDFLAGS:1:${#LDFLAGS}-2}
436 export LDFLAGS
437 return 0
438 }
439
440 fstack-flags() {
441 if has_ssp; then
442 [ -z "`is-flag -fno-stack-protector`" ] &&
443 export CFLAGS="${CFLAGS} `test_flag -fno-stack-protector`"
444 fi
445 return 0
446 }
447
448 # This is thanks to great work from Paul de Vrieze <gentoo-user@devrieze.net>,
449 # bug #9016. Also thanks to Jukka Salmi <salmi@gmx.net> (bug #13907) for more
450 # fixes.
451 #
452 # Export CFLAGS and CXXFLAGS that are compadible with gcc-2.95.3
453 gcc2-flags() {
454 if [[ $(tc-arch) == "x86" || $(tc-arch) == "amd64" ]] ; then
455 CFLAGS=${CFLAGS//-mtune=/-mcpu=}
456 CXXFLAGS=${CXXFLAGS//-mtune=/-mcpu=}
457 fi
458
459 replace-cpu-flags k6-{2,3} k6
460 replace-cpu-flags athlon{,-{tbird,4,xp,mp}} i686
461
462 replace-cpu-flags pentium-mmx i586
463 replace-cpu-flags pentium{2,3,4} i686
464
465 replace-cpu-flags ev6{7,8} ev6
466
467 export CFLAGS CXXFLAGS
468 }

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