/[gentoo-x86]/eclass/flag-o-matic.eclass
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Revision 1.15 Revision 1.65
1# Copyright 1999-2003 Gentoo Technologies, Inc. 1# Copyright 1999-2004 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# $Header: /var/cvsroot/gentoo-x86/eclass/flag-o-matic.eclass,v 1.15 2003/04/06 23:35:41 method Exp $ 3# $Header: /var/cvsroot/gentoo-x86/eclass/flag-o-matic.eclass,v 1.65 2004/07/27 19:25:49 vapier Exp $
4# 4#
5# Author Bart Verwilst <verwilst@gentoo.org> 5# Author Bart Verwilst <verwilst@gentoo.org>
6 6
7ECLASS=flag-o-matic 7ECLASS=flag-o-matic
8INHERITED="$INHERITED $ECLASS" 8INHERITED="$INHERITED $ECLASS"
9 9
10# Please leave ${IUSE} in this until portage .51 is stable, otherwise
11# IUSE gets clobbered.
12IUSE="${IUSE} debug"
13
10# 14#
11#### filter-flags <flag> #### 15#### filter-flags <flags> ####
12# Remove particular flags from C[XX]FLAGS 16# Remove particular flags from C[XX]FLAGS
17# Matches only complete flags
13# 18#
14#### append-flags <flag> #### 19#### append-flags <flags> ####
15# Add extra flags to your current C[XX]FLAGS 20# Add extra flags to your current C[XX]FLAGS
16# 21#
17#### replace-flags <orig.flag> <new.flag> ### 22#### replace-flags <orig.flag> <new.flag> ###
18# Replace a flag by another one 23# Replace a flag by another one
19# 24#
25#### replace-cpu-flags <new.cpu> <old.cpus> ###
26# Replace march/mcpu flags that specify <old.cpus>
27# with flags that specify <new.cpu>
28#
20#### is-flag <flag> #### 29#### is-flag <flag> ####
21# Returns "true" if flag is set in C[XX]FLAGS 30# Returns "true" if flag is set in C[XX]FLAGS
22# Matches only complete flag 31# Matches only complete a flag
23# 32#
24#### strip-flags #### 33#### strip-flags ####
25# Strip C[XX]FLAGS of everything except known 34# Strip C[XX]FLAGS of everything except known
26# good options. 35# good options.
27# 36#
37#### strip-unsupported-flags ####
38# Strip C[XX]FLAGS of any flags not supported by
39# installed version of gcc
40#
28#### get-flag <flag> #### 41#### get-flag <flag> ####
29# Find and echo the value for a particular flag 42# Find and echo the value for a particular flag
30# 43#
44#### replace-sparc64-flags ####
45# Sets mcpu to v8 and uses the original value
46# as mtune if none specified.
47#
48#### filter-mfpmath <math types> ####
49# Remove specified math types from the fpmath specification
50# If the user has -mfpmath=sse,386, running `filter-mfpmath sse`
51# will leave the user with -mfpmath=386
52#
53#### append-ldflags ####
54# Add extra flags to your current LDFLAGS
55#
56#### filter-ldflags <flags> ####
57# Remove particular flags from LDFLAGS
58# Matches only complete flags
59#
60#### etexec-flags ####
61# hooked function for hardened gcc that appends
62# -fno-pic to {C,CXX,LD}FLAGS
63# when a package is filtering -fpic, -fPIC, -fpie, -fPIE
64#
65#### fstack-flags ####
66# hooked function for hardened gcc that appends
67# -fno-stack-protector to {C,CXX,LD}FLAGS
68# when a package is filtering -fstack-protector, -fstack-protector-all
69# notice: modern automatic specs files will also suppress -fstack-protector-all
70# when only -fno-stack-protector is given
71#
31 72
73# C[XX]FLAGS that we allow in strip-flags
74setup-allowed-flags() {
75 if [ -z "${ALLOWED_FLAGS}" ] ; then
32ALLOWED_FLAGS="-O -mcpu -march -mtune -fstack-protector -pipe -g" 76 export ALLOWED_FLAGS="-O -O1 -O2 -mcpu -march -mtune -fstack-protector -fno-unit-at-a-time -pipe -g"
77 case "${ARCH}" in
78 mips) ALLOWED_FLAGS="${ALLOWED_FLAGS} -mips1 -mips2 -mips3 -mips4 -mabi" ;;
79 amd64) ALLOWED_FLAGS="${ALLOWED_FLAGS} -fPIC -m64" ;;
80 x86) ALLOWED_FLAGS="${ALLOWED_FLAGS} -m32" ;;
81 alpha) ALLOWED_FLAGS="${ALLOWED_FLAGS} -fPIC" ;;
82 ia64) ALLOWED_FLAGS="${ALLOWED_FLAGS} -fPIC" ;;
83 esac
84 fi
85 # allow a bunch of flags that negate features / control ABI
86 ALLOWED_FLAGS="${ALLOWED_FLAGS} -fno-stack-protector -fno-stack-protector-all"
87 case "${ARCH}" in
88 x86|amd64|ia64) ALLOWED_FLAGS="${ALLOWED_FLAGS} -mno-mmx -mno-sse -mno-sse2 -mno-sse3 -mno-3dnow" ;;
89 esac
90 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"
33 91
92 # C[XX]FLAGS that we are think is ok, but needs testing
93 # NOTE: currently -Os have issues with gcc3 and K6* arch's
94 export UNSTABLE_FLAGS="-Os -O3 -freorder-blocks -fprefetch-loop-arrays"
95 return 0
96}
34 97
35filter-flags () { 98filter-flags() {
99 local x f fset
100 declare -a new_CFLAGS new_CXXFLAGS
36 101
37 for x in $1 102 for x in "$@" ; do
103 case "${x}" in
104 -fPIC|-fpic|-fPIE|-fpie|-pie) etexec-flags;;
105 -fstack-protector|-fstack-protector-all) fstack-flags;;
106 esac
38 do 107 done
39 export CFLAGS="${CFLAGS/${x}}" 108
40 export CXXFLAGS="${CXXFLAGS/${x}}" 109 for fset in CFLAGS CXXFLAGS; do
110 # Looping over the flags instead of using a global
111 # substitution ensures that we're working with flag atoms.
112 # Otherwise globs like -O* have the potential to wipe out the
113 # list of flags.
114 for f in ${!fset}; do
115 for x in "$@"; do
116 # Note this should work with globs like -O*
117 [[ ${f} == ${x} ]] && continue 2
118 done
119 eval new_${fset}\[\${\#new_${fset}\[@]}]=\${f}
41 done 120 done
121 eval export ${fset}=\${new_${fset}\[*]}
122 done
42 123
124 return 0
43} 125}
44 126
127filter-lfs-flags() {
128 filter-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
129}
130
131append-lfs-flags() {
132 append-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
133}
134
45append-flags () { 135append-flags() {
46
47 CFLAGS="${CFLAGS} $1" 136 export CFLAGS="${CFLAGS} $*"
48 CXXFLAGS="${CXXFLAGS} $1" 137 export CXXFLAGS="${CXXFLAGS} $*"
49 138 [ -n "`is-flag -fno-stack-protector`" -o \
139 -n "`is-flag -fno-stack-protector-all`" ] && fstack-flags
140 return 0
50} 141}
51 142
52replace-flags () { 143replace-flags() {
144 local f fset
145 declare -a new_CFLAGS new_CXXFLAGS
53 146
54 CFLAGS="${CFLAGS/${1}/${2} }" 147 for fset in CFLAGS CXXFLAGS; do
55 CXXFLAGS="${CXXFLAGS/${1}/${2} }" 148 # Looping over the flags instead of using a global
149 # substitution ensures that we're working with flag atoms.
150 # Otherwise globs like -O* have the potential to wipe out the
151 # list of flags.
152 for f in ${!fset}; do
153 # Note this should work with globs like -O*
154 [[ ${f} == ${1} ]] && f=${2}
155 eval new_${fset}\[\${\#new_${fset}\[@]}]=\${f}
156 done
157 eval export ${fset}=\${new_${fset}\[*]}
158 done
56 159
160 return 0
161}
162
163replace-cpu-flags() {
164 local oldcpu newcpu="$1" ; shift
165 for oldcpu in "$@" ; do
166 # quote to make sure that no globbing is done (particularly on
167 # ${oldcpu} prior to calling replace-flags
168 replace-flags "-march=${oldcpu}" "-march=${newcpu}"
169 replace-flags "-mcpu=${oldcpu}" "-mcpu=${newcpu}"
170 replace-flags "-mtune=${oldcpu}" "-mtune=${newcpu}"
171 done
172 return 0
57} 173}
58 174
59is-flag() { 175is-flag() {
176 local x
60 177
61 for x in ${CFLAGS} ${CXXFLAGS} 178 for x in ${CFLAGS} ${CXXFLAGS} ; do
62 do
63 if [ "${x}" = "$1" ] 179 if [ "${x}" == "$1" ] ; then
64 then
65 echo true 180 echo true
66 break 181 return 0
67 fi 182 fi
68 done 183 done
184 return 1
185}
69 186
187filter-mfpmath() {
188 local orig_mfpmath new_math prune_math
189
190 # save the original -mfpmath flag
191 orig_mfpmath="`get-flag -mfpmath`"
192 # get the value of the current -mfpmath flag
193 new_math=" `get-flag mfpmath | tr , ' '` "
194 # figure out which math values are to be removed
195 prune_math=""
196 for prune_math in "$@" ; do
197 new_math="${new_math/ ${prune_math} / }"
198 done
199 new_math="`echo ${new_math:1:${#new_math}-2} | tr ' ' ,`"
200
201 if [ -z "${new_math}" ] ; then
202 # if we're removing all user specified math values are
203 # slated for removal, then we just filter the flag
204 filter-flags ${orig_mfpmath}
205 else
206 # if we only want to filter some of the user specified
207 # math values, then we replace the current flag
208 replace-flags ${orig_mfpmath} -mfpmath=${new_math}
209 fi
210 return 0
70} 211}
71 212
72strip-flags() { 213strip-flags() {
214 local x y flag NEW_CFLAGS NEW_CXXFLAGS
215
216 setup-allowed-flags
73 217
74 local NEW_CFLAGS="" 218 local NEW_CFLAGS=""
75 local NEW_CXXFLAGS="" 219 local NEW_CXXFLAGS=""
76 220
77 set -f 221 # Allow unstable C[XX]FLAGS if we are using unstable profile ...
222 if has ~${ARCH} ${ACCEPT_KEYWORDS} ; then
223 use debug && einfo "Enabling the use of some unstable flags"
224 ALLOWED_FLAGS="${ALLOWED_FLAGS} ${UNSTABLE_FLAGS}"
225 fi
78 226
227 set -f # disable pathname expansion
228
79 for x in ${CFLAGS} 229 for x in ${CFLAGS}; do
80 do
81 for y in ${ALLOWED_FLAGS} 230 for y in ${ALLOWED_FLAGS}; do
82 do
83 flag=${x%%=*} 231 flag=${x%%=*}
84 if [ "${flag%%${y}}" = "" ] 232 if [ "${flag%%${y}}" = "" ] ; then
85 then
86 NEW_CFLAGS="${NEW_CFLAGS} ${x}" 233 NEW_CFLAGS="${NEW_CFLAGS} ${x}"
87 break 234 break
88 fi 235 fi
89 done 236 done
90 done 237 done
91 238
92 for x in ${CXXFLAGS} 239 for x in ${CXXFLAGS}; do
93 do
94 for y in ${ALLOWED_FLAGS} 240 for y in ${ALLOWED_FLAGS}; do
95 do
96 flag=${x%%=*} 241 flag=${x%%=*}
97 if [ "${flag%%${y}}" = "" ] 242 if [ "${flag%%${y}}" = "" ] ; then
98 then
99 NEW_CXXFLAGS="${NEW_CXXFLAGS} ${x}" 243 NEW_CXXFLAGS="${NEW_CXXFLAGS} ${x}"
100 break 244 break
101 fi 245 fi
102 done 246 done
103 done 247 done
104 248
105 set +f 249 # In case we filtered out all optimization flags fallback to -O2
250 if [ "${CFLAGS/-O}" != "${CFLAGS}" -a "${NEW_CFLAGS/-O}" = "${NEW_CFLAGS}" ]; then
251 NEW_CFLAGS="${NEW_CFLAGS} -O2"
252 fi
253 if [ "${CXXFLAGS/-O}" != "${CXXFLAGS}" -a "${NEW_CXXFLAGS/-O}" = "${NEW_CXXFLAGS}" ]; then
254 NEW_CXXFLAGS="${NEW_CXXFLAGS} -O2"
255 fi
256
257 set +f # re-enable pathname expansion
106 258
107 export CFLAGS="${NEW_CFLAGS}" 259 export CFLAGS="${NEW_CFLAGS}"
108 export CXXFLAGS="${NEW_CXXFLAGS}" 260 export CXXFLAGS="${NEW_CXXFLAGS}"
261 return 0
262}
263
264test_flag() {
265 local cc=${CC:-gcc} ; cc=${cc%% *}
266 if ${cc} -S -xc "$@" -o /dev/null /dev/null &>/dev/null; then
267 printf "%s\n" "$*"
268 return 0
269 fi
270 return 1
271}
272
273test_version_info() {
274 local cc=${CC:-gcc} ; cc=${cc%% *}
275 if [[ $(${cc} --version 2>&1) == *$1* ]]; then
276 return 0
277 else
278 return 1
279 fi
280}
281
282strip-unsupported-flags() {
283 local NEW_CFLAGS NEW_CXXFLAGS
284
285 for x in ${CFLAGS} ; do
286 NEW_CFLAGS="${NEW_CFLAGS} `test_flag ${x}`"
287 done
288 for x in ${CXXFLAGS} ; do
289 NEW_CXXFLAGS="${NEW_CXXFLAGS} `test_flag ${x}`"
290 done
291
292 export CFLAGS="${NEW_CFLAGS}"
293 export CXXFLAGS="${NEW_CXXFLAGS}"
109} 294}
110 295
111get-flag() { 296get-flag() {
112 local findflag="$1" 297 local f findflag="$1"
113 298
299 # this code looks a little flaky but seems to work for
300 # everything we want ...
301 # for example, if CFLAGS="-march=i686":
302 # `get-flag -march` == "-march=i686"
303 # `get-flag march` == "i686"
114 for f in ${CFLAGS} ${CXXFLAGS} ; do 304 for f in ${CFLAGS} ${CXXFLAGS} ; do
115 if [ "${f/${findflag}}" != "${f}" ] ; then 305 if [ "${f/${findflag}}" != "${f}" ] ; then
116 echo "${f/-${findflag}=}" 306 printf "%s\n" "${f/-${findflag}=}"
117 return 307 return 0
118 fi 308 fi
119 done 309 done
310 return 1
120} 311}
312
313has_hardened() {
314 test_version_info Hardened
315 return $?
316}
317
318has_pic() {
319 [ "${CFLAGS/-fPIC}" != "${CFLAGS}" ] && return 0
320 [ "${CFLAGS/-fpic}" != "${CFLAGS}" ] && return 0
321 test_version_info pie && return 0
322 return 1
323}
324
325has_pie() {
326 [ "${CFLAGS/-fPIE}" != "${CFLAGS}" ] && return 0
327 [ "${CFLAGS/-fpie}" != "${CFLAGS}" ] && return 0
328 test_version_info pie && return 0
329 return 1
330}
331
332has_ssp() {
333 [ "${CFLAGS/-fstack-protector}" != "${CFLAGS}" ] && return 0
334 test_version_info ssp && return 0
335 return 1
336}
337
338has_m64() {
339 # this doesnt test if the flag is accepted, it tests if the flag
340 # actually -WORKS-. non-multilib gcc will take both -m32 and -m64!
341 # please dont replace this function with test_flag in some future
342 # clean-up!
343 temp=`mktemp`
344 echo "int main() { return(0); }" > ${temp}.c
345 ${CC/ .*/} -m64 -o /dev/null ${temp}.c > /dev/null 2>&1
346 ret=$?
347 rm -f ${temp}.c
348 [ "$ret" != "1" ] && return 0
349 return 1
350}
351
352has_m32() {
353 # this doesnt test if the flag is accepted, it tests if the flag
354 # actually -WORKS-. non-multilib gcc will take both -m32 and -m64!
355 # please dont replace this function with test_flag in some future
356 # clean-up!
357 temp=`mktemp`
358 echo "int main() { return(0); }" > ${temp}.c
359 ${CC/ .*/} -m32 -o /dev/null ${temp}.c > /dev/null 2>&1
360 ret=$?
361 rm -f ${temp}.c
362 [ "$ret" != "1" ] && return 0
363 return 1
364}
365
366replace-sparc64-flags() {
367 local SPARC64_CPUS="ultrasparc v9"
368
369 if [ "${CFLAGS/mtune}" != "${CFLAGS}" ]; then
370 for x in ${SPARC64_CPUS}; do
371 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8}"
372 done
373 else
374 for x in ${SPARC64_CPUS}; do
375 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
376 done
377 fi
378
379 if [ "${CXXFLAGS/mtune}" != "${CXXFLAGS}" ]; then
380 for x in ${SPARC64_CPUS}; do
381 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8}"
382 done
383 else
384 for x in ${SPARC64_CPUS}; do
385 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
386 done
387 fi
388
389 export CFLAGS CXXFLAGS
390}
391
392append-ldflags() {
393 export LDFLAGS="${LDFLAGS} $*"
394 return 0
395}
396
397filter-ldflags() {
398 local x
399
400 # we do this fancy spacing stuff so as to not filter
401 # out part of a flag ... we want flag atoms ! :D
402 LDFLAGS=" ${LDFLAGS} "
403 for x in "$@" ; do
404 LDFLAGS="${LDFLAGS// ${x} / }"
405 done
406 LDFLAGS="${LDFLAGS:1:${#LDFLAGS}-2}"
407 export LDFLAGS
408 return 0
409}
410
411etexec-flags() {
412 # if you're not using a hardened compiler you wont need this
413 # PIC/no-pic kludge in the first place.
414 has_hardened || return 0
415
416 if has_pie || has_pic; then
417 [ -z "`is-flag -fno-pic`" ] &&
418 export CFLAGS="${CFLAGS} `test_flag -fno-pic`"
419 [ -z "`is-flag -nopie`" ] &&
420 export CFLAGS="${CFLAGS} `test_flag -nopie`"
421 fi
422 return 0
423}
424
425fstack-flags() {
426 if has_ssp; then
427 [ -z "`is-flag -fno-stack-protector`" ] &&
428 export CFLAGS="${CFLAGS} `test_flag -fno-stack-protector`"
429 fi
430 return 0
431}

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