/[gentoo-x86]/eclass/flag-o-matic.eclass
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Revision 1.86 - (show annotations) (download)
Thu Apr 28 20:06:00 2005 UTC (9 years, 5 months ago) by solar
Branch: MAIN
Changes since 1.85: +21 -2 lines
- update has_pic to not test for pie. add has_ssp_all and comments. Kevin F. Quinn

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 1.85 2005/04/06 23:29:23 vapier Exp $
4
5 ECLASS=flag-o-matic
6 INHERITED="$INHERITED $ECLASS"
7
8 IUSE="debug"
9
10 # need access to emktemp()
11 inherit eutils toolchain-funcs multilib
12
13 #
14 #### filter-flags <flags> ####
15 # Remove particular flags from C[XX]FLAGS
16 # Matches only complete flags
17 #
18 #### append-flags <flags> ####
19 # Add extra flags to your current C[XX]FLAGS
20 #
21 #### replace-flags <orig.flag> <new.flag> ###
22 # Replace a flag by another one
23 #
24 #### replace-cpu-flags <old.cpus> <new.cpu> ###
25 # Replace march/mcpu flags that specify <old.cpus>
26 # with flags that specify <new.cpu>
27 #
28 #### is-flag <flag> ####
29 # Returns "true" if flag is set in C[XX]FLAGS
30 # Matches only complete a flag
31 #
32 #### strip-flags ####
33 # Strip C[XX]FLAGS of everything except known
34 # good options.
35 #
36 #### strip-unsupported-flags ####
37 # Strip C[XX]FLAGS of any flags not supported by
38 # installed version of gcc
39 #
40 #### get-flag <flag> ####
41 # Find and echo the value for a particular flag
42 #
43 #### replace-sparc64-flags ####
44 # Sets mcpu to v8 and uses the original value
45 # as mtune if none specified.
46 #
47 #### filter-mfpmath <math types> ####
48 # Remove specified math types from the fpmath specification
49 # If the user has -mfpmath=sse,386, running `filter-mfpmath sse`
50 # will leave the user with -mfpmath=386
51 #
52 #### append-ldflags ####
53 # Add extra flags to your current LDFLAGS
54 #
55 #### filter-ldflags <flags> ####
56 # Remove particular flags from LDFLAGS
57 # Matches only complete flags
58 #
59 #### fstack-flags ####
60 # hooked function for hardened gcc that appends
61 # -fno-stack-protector to {C,CXX,LD}FLAGS
62 # when a package is filtering -fstack-protector, -fstack-protector-all
63 # notice: modern automatic specs files will also suppress -fstack-protector-all
64 # when only -fno-stack-protector is given
65 #
66 #### has_pic ####
67 # Returns true if the compiler by default or with current CFLAGS
68 # builds position-independent code.
69 #
70 #### has_ssp_all ####
71 # Returns true if the compiler by default or with current CFLAGS
72 # generates stack smash protections for all functions
73 #
74 #### has_ssp ####
75 # Returns true if the compiler by default or with current CFLAGS
76 # generates stack smash protections for most vulnerable functions
77 #
78
79 # C[XX]FLAGS that we allow in strip-flags
80 setup-allowed-flags() {
81 if [[ -z ${ALLOWED_FLAGS} ]] ; then
82 export ALLOWED_FLAGS="-pipe"
83 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -O -O0 -O1 -O2 -mcpu -march -mtune"
84 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -fstack-protector -fno-stack-protector"
85 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -fno-pie -fno-unit-at-a-time"
86 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -g -g0 -g1 -g2 -g3 -ggdb -ggdb0 -ggdb1 -ggdb2 -ggdb3"
87 case $(tc-arch) in
88 mips) ALLOWED_FLAGS="${ALLOWED_FLAGS} -mips1 -mips2 -mips3 -mips4 -mips32 -mips64 -mips16 -EL -EB -mabi" ;;
89 amd64) ALLOWED_FLAGS="${ALLOWED_FLAGS} -fPIC -m64" ;;
90 x86) ALLOWED_FLAGS="${ALLOWED_FLAGS} -m32" ;;
91 alpha) ALLOWED_FLAGS="${ALLOWED_FLAGS} -fPIC" ;;
92 ia64) ALLOWED_FLAGS="${ALLOWED_FLAGS} -fPIC" ;;
93 sparc) ALLOWED_FLAGS="${ALLOWED_FLAGS} -m32 -m64" ;;
94 ppc) ALLOWED_FLAGS="${ALLOWED_FLAGS} -mabi" ;;
95 esac
96 fi
97 # allow a bunch of flags that negate features / control ABI
98 ALLOWED_FLAGS="${ALLOWED_FLAGS} -fno-stack-protector -fno-stack-protector-all"
99 case $(tc-arch) in
100 x86|amd64|ia64) ALLOWED_FLAGS="${ALLOWED_FLAGS} -mno-mmx -mno-sse -mno-sse2 -mno-sse3 -mno-3dnow" ;;
101 esac
102 ALLOWED_FLAGS="${ALLOWED_FLAGS} -mregparm -mno-app-regs -mapp-regs -msoft-float -mflat -mno-faster-structs -mfaster-structs -mlittle-endian -mbig-endian -mlive-g0 -mcmodel -mno-stack-bias -mstack-bias"
103
104 # C[XX]FLAGS that we are think is ok, but needs testing
105 # NOTE: currently -Os have issues with gcc3 and K6* arch's
106 export UNSTABLE_FLAGS="-Os -O3 -freorder-blocks -fprefetch-loop-arrays"
107 return 0
108 }
109
110 filter-flags() {
111 local x f fset
112 declare -a new_CFLAGS new_CXXFLAGS
113
114 for x in "$@" ; do
115 case "${x}" in
116 -fPIC|-fpic|-fPIE|-fpie|-pie)
117 append-flags `test_flag -fno-pie`;;
118 -fstack-protector|-fstack-protector-all)
119 fstack-flags;;
120 esac
121 done
122
123 for fset in CFLAGS CXXFLAGS; do
124 # Looping over the flags instead of using a global
125 # substitution ensures that we're working with flag atoms.
126 # Otherwise globs like -O* have the potential to wipe out the
127 # list of flags.
128 for f in ${!fset}; do
129 for x in "$@"; do
130 # Note this should work with globs like -O*
131 [[ ${f} == ${x} ]] && continue 2
132 done
133 eval new_${fset}\[\${\#new_${fset}\[@]}]=\${f}
134 done
135 eval export ${fset}=\${new_${fset}\[*]}
136 done
137
138 return 0
139 }
140
141 filter-lfs-flags() {
142 filter-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
143 }
144
145 append-lfs-flags() {
146 append-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
147 }
148
149 append-flags() {
150 [[ -z $* ]] && return 0
151 export CFLAGS="${CFLAGS} $*"
152 export CXXFLAGS="${CXXFLAGS} $*"
153 [ -n "`is-flag -fno-stack-protector`" -o \
154 -n "`is-flag -fno-stack-protector-all`" ] && fstack-flags
155 return 0
156 }
157
158 replace-flags() {
159 local f fset
160 declare -a new_CFLAGS new_CXXFLAGS
161
162 for fset in CFLAGS CXXFLAGS; do
163 # Looping over the flags instead of using a global
164 # substitution ensures that we're working with flag atoms.
165 # Otherwise globs like -O* have the potential to wipe out the
166 # list of flags.
167 for f in ${!fset}; do
168 # Note this should work with globs like -O*
169 [[ ${f} == ${1} ]] && f=${2}
170 eval new_${fset}\[\${\#new_${fset}\[@]}]=\${f}
171 done
172 eval export ${fset}=\${new_${fset}\[*]}
173 done
174
175 return 0
176 }
177
178 replace-cpu-flags() {
179 local newcpu="$#" ; newcpu="${!newcpu}"
180 while [ $# -gt 1 ] ; do
181 # quote to make sure that no globbing is done (particularly on
182 # ${oldcpu} prior to calling replace-flags
183 replace-flags "-march=${1}" "-march=${newcpu}"
184 replace-flags "-mcpu=${1}" "-mcpu=${newcpu}"
185 replace-flags "-mtune=${1}" "-mtune=${newcpu}"
186 shift
187 done
188 return 0
189 }
190
191 is-flag() {
192 local x
193
194 for x in ${CFLAGS} ${CXXFLAGS} ; do
195 # Note this should work with globs like -mcpu=ultrasparc*
196 if [[ ${x} == ${1} ]]; then
197 echo true
198 return 0
199 fi
200 done
201 return 1
202 }
203
204 filter-mfpmath() {
205 local orig_mfpmath new_math prune_math
206
207 # save the original -mfpmath flag
208 orig_mfpmath="`get-flag -mfpmath`"
209 # get the value of the current -mfpmath flag
210 new_math=" `get-flag mfpmath | tr , ' '` "
211 # figure out which math values are to be removed
212 prune_math=""
213 for prune_math in "$@" ; do
214 new_math="${new_math/ ${prune_math} / }"
215 done
216 new_math="`echo ${new_math:1:${#new_math}-2} | tr ' ' ,`"
217
218 if [ -z "${new_math}" ] ; then
219 # if we're removing all user specified math values are
220 # slated for removal, then we just filter the flag
221 filter-flags ${orig_mfpmath}
222 else
223 # if we only want to filter some of the user specified
224 # math values, then we replace the current flag
225 replace-flags ${orig_mfpmath} -mfpmath=${new_math}
226 fi
227 return 0
228 }
229
230 strip-flags() {
231 local x y flag NEW_CFLAGS NEW_CXXFLAGS
232
233 setup-allowed-flags
234
235 local NEW_CFLAGS=""
236 local NEW_CXXFLAGS=""
237
238 # Allow unstable C[XX]FLAGS if we are using unstable profile ...
239 if has ~$(tc-arch) ${ACCEPT_KEYWORDS} ; then
240 use debug && einfo "Enabling the use of some unstable flags"
241 ALLOWED_FLAGS="${ALLOWED_FLAGS} ${UNSTABLE_FLAGS}"
242 fi
243
244 set -f # disable pathname expansion
245
246 for x in ${CFLAGS}; do
247 for y in ${ALLOWED_FLAGS}; do
248 flag=${x%%=*}
249 if [ "${flag%%${y}}" = "" ] ; then
250 NEW_CFLAGS="${NEW_CFLAGS} ${x}"
251 break
252 fi
253 done
254 done
255
256 for x in ${CXXFLAGS}; do
257 for y in ${ALLOWED_FLAGS}; do
258 flag=${x%%=*}
259 if [ "${flag%%${y}}" = "" ] ; then
260 NEW_CXXFLAGS="${NEW_CXXFLAGS} ${x}"
261 break
262 fi
263 done
264 done
265
266 # In case we filtered out all optimization flags fallback to -O2
267 if [ "${CFLAGS/-O}" != "${CFLAGS}" -a "${NEW_CFLAGS/-O}" = "${NEW_CFLAGS}" ]; then
268 NEW_CFLAGS="${NEW_CFLAGS} -O2"
269 fi
270 if [ "${CXXFLAGS/-O}" != "${CXXFLAGS}" -a "${NEW_CXXFLAGS/-O}" = "${NEW_CXXFLAGS}" ]; then
271 NEW_CXXFLAGS="${NEW_CXXFLAGS} -O2"
272 fi
273
274 set +f # re-enable pathname expansion
275
276 export CFLAGS="${NEW_CFLAGS}"
277 export CXXFLAGS="${NEW_CXXFLAGS}"
278 return 0
279 }
280
281 test_flag() {
282 if $(tc-getCC) -S -xc "$@" -o "$(emktemp)" /dev/null &>/dev/null; then
283 printf "%s\n" "$*"
284 return 0
285 fi
286 return 1
287 }
288
289 test_version_info() {
290 if [[ $($(tc-getCC) --version 2>&1) == *$1* ]]; then
291 return 0
292 else
293 return 1
294 fi
295 }
296
297 strip-unsupported-flags() {
298 local NEW_CFLAGS NEW_CXXFLAGS
299
300 for x in ${CFLAGS} ; do
301 NEW_CFLAGS="${NEW_CFLAGS} `test_flag ${x}`"
302 done
303 for x in ${CXXFLAGS} ; do
304 NEW_CXXFLAGS="${NEW_CXXFLAGS} `test_flag ${x}`"
305 done
306
307 export CFLAGS="${NEW_CFLAGS}"
308 export CXXFLAGS="${NEW_CXXFLAGS}"
309 }
310
311 get-flag() {
312 local f findflag="$1"
313
314 # this code looks a little flaky but seems to work for
315 # everything we want ...
316 # for example, if CFLAGS="-march=i686":
317 # `get-flag -march` == "-march=i686"
318 # `get-flag march` == "i686"
319 for f in ${CFLAGS} ${CXXFLAGS} ; do
320 if [ "${f/${findflag}}" != "${f}" ] ; then
321 printf "%s\n" "${f/-${findflag}=}"
322 return 0
323 fi
324 done
325 return 1
326 }
327
328 has_hardened() {
329 test_version_info Hardened && return 0
330 # the specs file wont exist unless gcc has GCC_SPECS support
331 [ -f "${GCC_SPECS}" -a "${GCC_SPECS}" != "${GCC_SPECS/hardened/}" ] && \
332 return 0
333 return 1
334 }
335
336 # indicate whether PIC is set
337 has_pic() {
338 [ "${CFLAGS/-fPIC}" != "${CFLAGS}" ] && return 0
339 [ "${CFLAGS/-fpic}" != "${CFLAGS}" ] && return 0
340 [ "$(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __PIC__)" ] && return 0
341 return 1
342 }
343
344 # indicate whether PIE is set
345 has_pie() {
346 [ "${CFLAGS/-fPIE}" != "${CFLAGS}" ] && return 0
347 [ "${CFLAGS/-fpie}" != "${CFLAGS}" ] && return 0
348 [ "$(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __PIE__)" ] && return 0
349 # test PIC while waiting for specs to be updated to generate __PIE__
350 [ "$(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __PIC__)" ] && return 0
351 return 1
352 }
353
354 # indicate whether code for SSP is being generated for all functions
355 has_ssp_all() {
356 # note; this matches only -fstack-protector-all
357 [ "${CFLAGS/-fstack-protector-all}" != "${CFLAGS}" ] && return 0
358 [ "$(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __SSP_ALL__)" ] && return 0
359 return 1
360 }
361
362 # indicate whether code for SSP is being generated
363 has_ssp() {
364 # note; this matches both -fstack-protector and -fstack-protector-all
365 [ "${CFLAGS/-fstack-protector}" != "${CFLAGS}" ] && return 0
366 [ "$(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __SSP__)" ] && return 0
367 return 1
368 }
369
370 has_m64() {
371 # this doesnt test if the flag is accepted, it tests if the flag
372 # actually -WORKS-. non-multilib gcc will take both -m32 and -m64!
373 # please dont replace this function with test_flag in some future
374 # clean-up!
375 local temp="$(emktemp)"
376 echo "int main() { return(0); }" > ${temp}.c
377 MY_CC=$(tc-getCC)
378 ${MY_CC/ .*/} -m64 -o "$(emktemp)" ${temp}.c > /dev/null 2>&1
379 local ret=$?
380 rm -f ${temp}.c
381 [ "$ret" != "1" ] && return 0
382 return 1
383 }
384
385 has_m32() {
386 # this doesnt test if the flag is accepted, it tests if the flag
387 # actually -WORKS-. non-multilib gcc will take both -m32 and -m64!
388 # please dont replace this function with test_flag in some future
389 # clean-up!
390
391 [ "$(tc-arch)" = "amd64" ] && has_multilib_profile && return 0
392
393 local temp="$(emktemp)"
394 echo "int main() { return(0); }" > ${temp}.c
395 MY_CC=$(tc-getCC)
396 ${MY_CC/ .*/} -m32 -o "$(emktemp)" ${temp}.c > /dev/null 2>&1
397 local ret=$?
398 rm -f ${temp}.c
399 [ "$ret" != "1" ] && return 0
400 return 1
401 }
402
403 replace-sparc64-flags() {
404 local SPARC64_CPUS="ultrasparc v9"
405
406 if [ "${CFLAGS/mtune}" != "${CFLAGS}" ]; then
407 for x in ${SPARC64_CPUS}; do
408 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8}"
409 done
410 else
411 for x in ${SPARC64_CPUS}; do
412 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
413 done
414 fi
415
416 if [ "${CXXFLAGS/mtune}" != "${CXXFLAGS}" ]; then
417 for x in ${SPARC64_CPUS}; do
418 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8}"
419 done
420 else
421 for x in ${SPARC64_CPUS}; do
422 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
423 done
424 fi
425
426 export CFLAGS CXXFLAGS
427 }
428
429 append-ldflags() {
430 export LDFLAGS="${LDFLAGS} $*"
431 return 0
432 }
433
434 filter-ldflags() {
435 local x
436
437 # we do this fancy spacing stuff so as to not filter
438 # out part of a flag ... we want flag atoms ! :D
439 LDFLAGS=" ${LDFLAGS} "
440 for x in "$@" ; do
441 LDFLAGS=${LDFLAGS// ${x} / }
442 done
443 [[ -z ${LDFLAGS// } ]] \
444 && LDFLAGS="" \
445 || LDFLAGS=${LDFLAGS:1:${#LDFLAGS}-2}
446 export LDFLAGS
447 return 0
448 }
449
450 fstack-flags() {
451 if has_ssp; then
452 [ -z "`is-flag -fno-stack-protector`" ] &&
453 export CFLAGS="${CFLAGS} `test_flag -fno-stack-protector`"
454 fi
455 return 0
456 }
457
458 # This is thanks to great work from Paul de Vrieze <gentoo-user@devrieze.net>,
459 # bug #9016. Also thanks to Jukka Salmi <salmi@gmx.net> (bug #13907) for more
460 # fixes.
461 #
462 # Export CFLAGS and CXXFLAGS that are compadible with gcc-2.95.3
463 gcc2-flags() {
464 if [[ $(tc-arch) == "x86" || $(tc-arch) == "amd64" ]] ; then
465 CFLAGS=${CFLAGS//-mtune=/-mcpu=}
466 CXXFLAGS=${CXXFLAGS//-mtune=/-mcpu=}
467 fi
468
469 replace-cpu-flags k6-{2,3} k6
470 replace-cpu-flags athlon{,-{tbird,4,xp,mp}} i686
471
472 replace-cpu-flags pentium-mmx i586
473 replace-cpu-flags pentium{2,3,4} i686
474
475 replace-cpu-flags ev6{7,8} ev6
476
477 export CFLAGS CXXFLAGS
478 }

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