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1# Copyright 1999-2002 Gentoo Technologies, Inc. 1# Copyright 1999-2005 Gentoo Foundation
2# Distributed under the terms of the GNU General Public License v2 2# Distributed under the terms of the GNU General Public License v2
3# Author Bart Verwilst <verwilst@gentoo.org> 3# $Header: /var/cvsroot/gentoo-x86/eclass/flag-o-matic.eclass,v 1.86 2005/04/28 20:06:00 solar Exp $
4# /space/gentoo/cvsroot/gentoo-x86/eclass/flag-o-matic.eclass 4
5ECLASS=flag-o-matic 5ECLASS=flag-o-matic
6INHERITED="$INHERITED $ECLASS"
6 7
8IUSE="debug"
9
10# need access to emktemp()
11inherit eutils toolchain-funcs multilib
12
7# 13#
8#### filter-flags <flag> #### 14#### filter-flags <flags> ####
9# Remove particular flags from C[XX]FLAGS 15# Remove particular flags from C[XX]FLAGS
16# Matches only complete flags
10# 17#
11#### append-flags <flag> #### 18#### append-flags <flags> ####
12# Add extra flags to your current C[XX]FLAGS 19# Add extra flags to your current C[XX]FLAGS
13# 20#
14#### change-flags <orig.flag> <new.flag> ### 21#### replace-flags <orig.flag> <new.flag> ###
15# Replace a flag by another one 22# Replace a flag by another one
16# 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#
17 78
79# C[XX]FLAGS that we allow in strip-flags
80setup-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"
18 103
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
19filter-flags () { 110filter-flags() {
111 local x f fset
112 declare -a new_CFLAGS new_CXXFLAGS
20 113
21 for x in $1; do 114 for x in "$@" ; do
22 CFLAGS="${CFLAGS/$x}" 115 case "${x}" in
23 CXXFLAGS="${CXXFLAGS/$x}" 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}
24 done 134 done
135 eval export ${fset}=\${new_${fset}\[*]}
136 done
25 137
138 return 0
26} 139}
27 140
141filter-lfs-flags() {
142 filter-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
143}
144
145append-lfs-flags() {
146 append-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
147}
148
28append-flags () { 149append-flags() {
29 150 [[ -z $* ]] && return 0
30
31 CFLAGS="$CFLAGS $1" 151 export CFLAGS="${CFLAGS} $*"
32 CXXFLAGS="$CXXFLAGS $1" 152 export CXXFLAGS="${CXXFLAGS} $*"
33 153 [ -n "`is-flag -fno-stack-protector`" -o \
154 -n "`is-flag -fno-stack-protector-all`" ] && fstack-flags
155 return 0
34} 156}
35 157
158replace-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
178replace-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
191is-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} == ${1} ]]; then
197 echo true
198 return 0
199 fi
200 done
201 return 1
202}
203
204filter-mfpmath() {
205 local orig_mfpmath new_math prune_math
206
207 # save the original -mfpmath flag
208 orig_mfpmath="`get-flag -mfpmath`"
209 # get the value of the current -mfpmath flag
210 new_math=" `get-flag mfpmath | tr , ' '` "
211 # figure out which math values are to be removed
212 prune_math=""
213 for prune_math in "$@" ; 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
230strip-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
281test_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
289test_version_info() {
290 if [[ $($(tc-getCC) --version 2>&1) == *$1* ]]; then
291 return 0
292 else
293 return 1
294 fi
295}
296
297strip-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
36change-flags () { 311get-flag() {
312 local f findflag="$1"
37 313
38 CFLAGS="${CFLAGS/${1}/${2}" 314 # this code looks a little flaky but seems to work for
39 CXXFLAGS="${CXXFLAGS/${1}/${2}" 315 # everything we want ...
40 316 # 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
41} 326}
327
328has_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}" != "${GCC_SPECS/hardened/}" ] && \
332 return 0
333 return 1
334}
335
336# indicate whether PIC is set
337has_pic() {
338 [ "${CFLAGS/-fPIC}" != "${CFLAGS}" ] && return 0
339 [ "${CFLAGS/-fpic}" != "${CFLAGS}" ] && return 0
340 [ "$(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __PIC__)" ] && return 0
341 return 1
342}
343
344# indicate whether PIE is set
345has_pie() {
346 [ "${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) ${CFLAGS} -E -dM - | grep __PIC__)" ] && return 0
351 return 1
352}
353
354# indicate whether code for SSP is being generated for all functions
355has_ssp_all() {
356 # note; this matches only -fstack-protector-all
357 [ "${CFLAGS/-fstack-protector-all}" != "${CFLAGS}" ] && return 0
358 [ "$(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __SSP_ALL__)" ] && return 0
359 return 1
360}
361
362# indicate whether code for SSP is being generated
363has_ssp() {
364 # note; this matches both -fstack-protector and -fstack-protector-all
365 [ "${CFLAGS/-fstack-protector}" != "${CFLAGS}" ] && return 0
366 [ "$(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __SSP__)" ] && return 0
367 return 1
368}
369
370has_m64() {
371 # this doesnt test if the flag is accepted, it tests if the flag
372 # actually -WORKS-. non-multilib gcc will take both -m32 and -m64!
373 # please dont replace this function with test_flag in some future
374 # clean-up!
375 local temp="$(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
385has_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
403replace-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
429append-ldflags() {
430 export LDFLAGS="${LDFLAGS} $*"
431 return 0
432}
433
434filter-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:${#LDFLAGS}-2}
446 export LDFLAGS
447 return 0
448}
449
450fstack-flags() {
451 if has_ssp; then
452 [ -z "`is-flag -fno-stack-protector`" ] &&
453 export CFLAGS="${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
463gcc2-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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