/[gentoo-x86]/eclass/flag-o-matic.eclass
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Revision 1.88 - (show annotations) (download)
Wed Jul 6 20:20:03 2005 UTC (9 years ago) by agriffis
Branch: MAIN
Changes since 1.87: +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 1.87 2005/06/24 22:06:19 vapier Exp $
4
5 INHERITED="$INHERITED $ECLASS"
6
7 # need access to emktemp()
8 inherit eutils toolchain-funcs multilib
9
10 #
11 #### filter-flags <flags> ####
12 # Remove particular flags from C[XX]FLAGS
13 # Matches only complete flags
14 #
15 #### append-flags <flags> ####
16 # Add extra flags to your current C[XX]FLAGS
17 #
18 #### replace-flags <orig.flag> <new.flag> ###
19 # Replace a flag by another one
20 #
21 #### replace-cpu-flags <old.cpus> <new.cpu> ###
22 # Replace march/mcpu flags that specify <old.cpus>
23 # with flags that specify <new.cpu>
24 #
25 #### is-flag <flag> ####
26 # Returns "true" if flag is set in C[XX]FLAGS
27 # Matches only complete a flag
28 #
29 #### strip-flags ####
30 # Strip C[XX]FLAGS of everything except known
31 # good options.
32 #
33 #### strip-unsupported-flags ####
34 # Strip C[XX]FLAGS of any flags not supported by
35 # installed version of gcc
36 #
37 #### get-flag <flag> ####
38 # Find and echo the value for a particular flag
39 #
40 #### replace-sparc64-flags ####
41 # Sets mcpu to v8 and uses the original value
42 # as mtune if none specified.
43 #
44 #### filter-mfpmath <math types> ####
45 # Remove specified math types from the fpmath specification
46 # If the user has -mfpmath=sse,386, running `filter-mfpmath sse`
47 # will leave the user with -mfpmath=386
48 #
49 #### append-ldflags ####
50 # Add extra flags to your current LDFLAGS
51 #
52 #### filter-ldflags <flags> ####
53 # Remove particular flags from LDFLAGS
54 # Matches only complete flags
55 #
56 #### fstack-flags ####
57 # hooked function for hardened gcc that appends
58 # -fno-stack-protector to {C,CXX,LD}FLAGS
59 # when a package is filtering -fstack-protector, -fstack-protector-all
60 # notice: modern automatic specs files will also suppress -fstack-protector-all
61 # when only -fno-stack-protector is given
62 #
63 #### has_pic ####
64 # Returns true if the compiler by default or with current CFLAGS
65 # builds position-independent code.
66 #
67 #### has_ssp_all ####
68 # Returns true if the compiler by default or with current CFLAGS
69 # generates stack smash protections for all functions
70 #
71 #### has_ssp ####
72 # Returns true if the compiler by default or with current CFLAGS
73 # generates stack smash protections for most vulnerable functions
74 #
75
76 # C[XX]FLAGS that we allow in strip-flags
77 setup-allowed-flags() {
78 if [[ -z ${ALLOWED_FLAGS} ]] ; then
79 export ALLOWED_FLAGS="-pipe"
80 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -O -O0 -O1 -O2 -mcpu -march -mtune"
81 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -fstack-protector -fstack-protector-all"
82 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -fbounds-checking -fno-bounds-checking"
83 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -fno-pie -fno-unit-at-a-time"
84 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -g -g0 -g1 -g2 -g3 -ggdb -ggdb0 -ggdb1 -ggdb2 -ggdb3"
85 fi
86 # allow a bunch of flags that negate features / control ABI
87 ALLOWED_FLAGS="${ALLOWED_FLAGS} -fno-stack-protector -fno-stack-protector-all"
88 ALLOWED_FLAGS="${ALLOWED_FLAGS} -mregparm -mno-app-regs -mapp-regs \
89 -mno-mmx -mno-sse -mno-sse2 -mno-sse3 -mno-3dnow \
90 -mips1 -mips2 -mips3 -mips4 -mips32 -mips64 -mips16 \
91 -msoft-float -mno-soft-float -mhard-float -mno-hard-float -mfpu \
92 -mflat -mno-flat -mno-faster-structs -mfaster-structs \
93 -m32 -m64 -mabi -mlittle-endian -mbig-endian -EL -EB -fPIC \
94 -mlive-g0 -mcmodel -mstack-bias -mno-stack-bias"
95
96 # C[XX]FLAGS that we are think is ok, but needs testing
97 # NOTE: currently -Os have issues with gcc3 and K6* arch's
98 export UNSTABLE_FLAGS="-Os -O3 -freorder-blocks -fprefetch-loop-arrays"
99 return 0
100 }
101
102 filter-flags() {
103 local x f fset
104 declare -a new_CFLAGS new_CXXFLAGS
105
106 for x in "$@" ; do
107 case "${x}" in
108 -fPIC|-fpic|-fPIE|-fpie|-pie)
109 append-flags `test_flag -fno-pie`;;
110 -fstack-protector|-fstack-protector-all)
111 fstack-flags;;
112 esac
113 done
114
115 for fset in CFLAGS CXXFLAGS; do
116 # Looping over the flags instead of using a global
117 # substitution ensures that we're working with flag atoms.
118 # Otherwise globs like -O* have the potential to wipe out the
119 # list of flags.
120 for f in ${!fset}; do
121 for x in "$@"; do
122 # Note this should work with globs like -O*
123 [[ ${f} == ${x} ]] && continue 2
124 done
125 eval new_${fset}\[\${\#new_${fset}\[@]}]=\${f}
126 done
127 eval export ${fset}=\${new_${fset}\[*]}
128 done
129
130 return 0
131 }
132
133 filter-lfs-flags() {
134 filter-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
135 }
136
137 append-lfs-flags() {
138 append-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
139 }
140
141 append-flags() {
142 [[ -z $* ]] && return 0
143 export CFLAGS="${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 ~$(tc-arch) ${ACCEPT_KEYWORDS} ; then
232 ALLOWED_FLAGS="${ALLOWED_FLAGS} ${UNSTABLE_FLAGS}"
233 fi
234
235 set -f # disable pathname expansion
236
237 for x in ${CFLAGS}; do
238 for y in ${ALLOWED_FLAGS}; do
239 flag=${x%%=*}
240 if [ "${flag%%${y}}" = "" ] ; then
241 NEW_CFLAGS="${NEW_CFLAGS} ${x}"
242 break
243 fi
244 done
245 done
246
247 for x in ${CXXFLAGS}; do
248 for y in ${ALLOWED_FLAGS}; do
249 flag=${x%%=*}
250 if [ "${flag%%${y}}" = "" ] ; then
251 NEW_CXXFLAGS="${NEW_CXXFLAGS} ${x}"
252 break
253 fi
254 done
255 done
256
257 # In case we filtered out all optimization flags fallback to -O2
258 if [ "${CFLAGS/-O}" != "${CFLAGS}" -a "${NEW_CFLAGS/-O}" = "${NEW_CFLAGS}" ]; then
259 NEW_CFLAGS="${NEW_CFLAGS} -O2"
260 fi
261 if [ "${CXXFLAGS/-O}" != "${CXXFLAGS}" -a "${NEW_CXXFLAGS/-O}" = "${NEW_CXXFLAGS}" ]; then
262 NEW_CXXFLAGS="${NEW_CXXFLAGS} -O2"
263 fi
264
265 set +f # re-enable pathname expansion
266
267 export CFLAGS="${NEW_CFLAGS}"
268 export CXXFLAGS="${NEW_CXXFLAGS}"
269 return 0
270 }
271
272 test_flag() {
273 if $(tc-getCC) -S -xc "$@" -o "$(emktemp)" /dev/null &>/dev/null; then
274 printf "%s\n" "$*"
275 return 0
276 fi
277 return 1
278 }
279
280 test_version_info() {
281 if [[ $($(tc-getCC) --version 2>&1) == *$1* ]]; then
282 return 0
283 else
284 return 1
285 fi
286 }
287
288 strip-unsupported-flags() {
289 local NEW_CFLAGS NEW_CXXFLAGS
290
291 for x in ${CFLAGS} ; do
292 NEW_CFLAGS="${NEW_CFLAGS} `test_flag ${x}`"
293 done
294 for x in ${CXXFLAGS} ; do
295 NEW_CXXFLAGS="${NEW_CXXFLAGS} `test_flag ${x}`"
296 done
297
298 export CFLAGS="${NEW_CFLAGS}"
299 export CXXFLAGS="${NEW_CXXFLAGS}"
300 }
301
302 get-flag() {
303 local f findflag="$1"
304
305 # this code looks a little flaky but seems to work for
306 # everything we want ...
307 # for example, if CFLAGS="-march=i686":
308 # `get-flag -march` == "-march=i686"
309 # `get-flag march` == "i686"
310 for f in ${CFLAGS} ${CXXFLAGS} ; do
311 if [ "${f/${findflag}}" != "${f}" ] ; then
312 printf "%s\n" "${f/-${findflag}=}"
313 return 0
314 fi
315 done
316 return 1
317 }
318
319 has_hardened() {
320 test_version_info Hardened && return 0
321 # the specs file wont exist unless gcc has GCC_SPECS support
322 [ -f "${GCC_SPECS}" -a "${GCC_SPECS}" != "${GCC_SPECS/hardened/}" ] && \
323 return 0
324 return 1
325 }
326
327 # indicate whether PIC is set
328 has_pic() {
329 [ "${CFLAGS/-fPIC}" != "${CFLAGS}" ] && return 0
330 [ "${CFLAGS/-fpic}" != "${CFLAGS}" ] && return 0
331 [ "$(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __PIC__)" ] && return 0
332 return 1
333 }
334
335 # indicate whether PIE is set
336 has_pie() {
337 [ "${CFLAGS/-fPIE}" != "${CFLAGS}" ] && return 0
338 [ "${CFLAGS/-fpie}" != "${CFLAGS}" ] && return 0
339 [ "$(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __PIE__)" ] && return 0
340 # test PIC while waiting for specs to be updated to generate __PIE__
341 [ "$(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __PIC__)" ] && return 0
342 return 1
343 }
344
345 # indicate whether code for SSP is being generated for all functions
346 has_ssp_all() {
347 # note; this matches only -fstack-protector-all
348 [ "${CFLAGS/-fstack-protector-all}" != "${CFLAGS}" ] && return 0
349 [ "$(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __SSP_ALL__)" ] && return 0
350 return 1
351 }
352
353 # indicate whether code for SSP is being generated
354 has_ssp() {
355 # note; this matches both -fstack-protector and -fstack-protector-all
356 [ "${CFLAGS/-fstack-protector}" != "${CFLAGS}" ] && return 0
357 [ "$(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __SSP__)" ] && return 0
358 return 1
359 }
360
361 has_m64() {
362 # this doesnt test if the flag is accepted, it tests if the flag
363 # actually -WORKS-. non-multilib gcc will take both -m32 and -m64!
364 # please dont replace this function with test_flag in some future
365 # clean-up!
366 local temp="$(emktemp)"
367 echo "int main() { return(0); }" > ${temp}.c
368 MY_CC=$(tc-getCC)
369 ${MY_CC/ .*/} -m64 -o "$(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 has_m32() {
377 # this doesnt test if the flag is accepted, it tests if the flag
378 # actually -WORKS-. non-multilib gcc will take both -m32 and -m64!
379 # please dont replace this function with test_flag in some future
380 # clean-up!
381
382 [ "$(tc-arch)" = "amd64" ] && has_multilib_profile && return 0
383
384 local temp="$(emktemp)"
385 echo "int main() { return(0); }" > ${temp}.c
386 MY_CC=$(tc-getCC)
387 ${MY_CC/ .*/} -m32 -o "$(emktemp)" ${temp}.c > /dev/null 2>&1
388 local ret=$?
389 rm -f ${temp}.c
390 [ "$ret" != "1" ] && return 0
391 return 1
392 }
393
394 replace-sparc64-flags() {
395 local SPARC64_CPUS="ultrasparc v9"
396
397 if [ "${CFLAGS/mtune}" != "${CFLAGS}" ]; then
398 for x in ${SPARC64_CPUS}; do
399 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8}"
400 done
401 else
402 for x in ${SPARC64_CPUS}; do
403 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
404 done
405 fi
406
407 if [ "${CXXFLAGS/mtune}" != "${CXXFLAGS}" ]; then
408 for x in ${SPARC64_CPUS}; do
409 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8}"
410 done
411 else
412 for x in ${SPARC64_CPUS}; do
413 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
414 done
415 fi
416
417 export CFLAGS CXXFLAGS
418 }
419
420 append-ldflags() {
421 export LDFLAGS="${LDFLAGS} $*"
422 return 0
423 }
424
425 filter-ldflags() {
426 local x
427
428 # we do this fancy spacing stuff so as to not filter
429 # out part of a flag ... we want flag atoms ! :D
430 LDFLAGS=" ${LDFLAGS} "
431 for x in "$@" ; do
432 LDFLAGS=${LDFLAGS// ${x} / }
433 done
434 [[ -z ${LDFLAGS// } ]] \
435 && LDFLAGS="" \
436 || LDFLAGS=${LDFLAGS:1:${#LDFLAGS}-2}
437 export LDFLAGS
438 return 0
439 }
440
441 fstack-flags() {
442 if has_ssp; then
443 [ -z "`is-flag -fno-stack-protector`" ] &&
444 export CFLAGS="${CFLAGS} `test_flag -fno-stack-protector`"
445 fi
446 return 0
447 }
448
449 # This is thanks to great work from Paul de Vrieze <gentoo-user@devrieze.net>,
450 # bug #9016. Also thanks to Jukka Salmi <salmi@gmx.net> (bug #13907) for more
451 # fixes.
452 #
453 # Export CFLAGS and CXXFLAGS that are compadible with gcc-2.95.3
454 gcc2-flags() {
455 if [[ $(tc-arch) == "x86" || $(tc-arch) == "amd64" ]] ; then
456 CFLAGS=${CFLAGS//-mtune=/-mcpu=}
457 CXXFLAGS=${CXXFLAGS//-mtune=/-mcpu=}
458 fi
459
460 replace-cpu-flags k6-{2,3} k6
461 replace-cpu-flags athlon{,-{tbird,4,xp,mp}} i686
462
463 replace-cpu-flags pentium-mmx i586
464 replace-cpu-flags pentium{2,3,4} i686
465
466 replace-cpu-flags ev6{7,8} ev6
467
468 export CFLAGS CXXFLAGS
469 }

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