/[gentoo-x86]/eclass/flag-o-matic.eclass
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Revision 1.15 Revision 1.62
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 1.62 2004/07/15 04:59:44 lv 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 $ECLASS"
9IUSE="$IUSE debug"
9 10
10# 11#
11#### filter-flags <flag> #### 12#### filter-flags <flags> ####
12# Remove particular flags from C[XX]FLAGS 13# Remove particular flags from C[XX]FLAGS
14# Matches only complete flags
13# 15#
14#### append-flags <flag> #### 16#### append-flags <flags> ####
15# Add extra flags to your current C[XX]FLAGS 17# Add extra flags to your current C[XX]FLAGS
16# 18#
17#### replace-flags <orig.flag> <new.flag> ### 19#### replace-flags <orig.flag> <new.flag> ###
18# Replace a flag by another one 20# Replace a flag by another one
19# 21#
22#### replace-cpu-flags <new.cpu> <old.cpus> ###
23# Replace march/mcpu flags that specify <old.cpus>
24# with flags that specify <new.cpu>
25#
20#### is-flag <flag> #### 26#### is-flag <flag> ####
21# Returns "true" if flag is set in C[XX]FLAGS 27# Returns "true" if flag is set in C[XX]FLAGS
22# Matches only complete flag 28# Matches only complete a flag
23# 29#
24#### strip-flags #### 30#### strip-flags ####
25# Strip C[XX]FLAGS of everything except known 31# Strip C[XX]FLAGS of everything except known
26# good options. 32# good options.
27# 33#
34#### strip-unsupported-flags ####
35# Strip C[XX]FLAGS of any flags not supported by
36# installed version of gcc
37#
28#### get-flag <flag> #### 38#### get-flag <flag> ####
29# Find and echo the value for a particular flag 39# Find and echo the value for a particular flag
30# 40#
41#### replace-sparc64-flags ####
42# Sets mcpu to v8 and uses the original value
43# as mtune if none specified.
44#
45#### filter-mfpmath <math types> ####
46# Remove specified math types from the fpmath specification
47# If the user has -mfpmath=sse,386, running `filter-mfpmath sse`
48# will leave the user with -mfpmath=386
49#
50#### append-ldflags ####
51# Add extra flags to your current LDFLAGS
52#
53#### filter-ldflags <flags> ####
54# Remove particular flags from LDFLAGS
55# Matches only complete flags
56#
57#### etexec-flags ####
58# hooked function for hardened gcc that appends
59# -fno-pic to {C,CXX,LD}FLAGS
60# when a package is filtering -fpic, -fPIC, -fpie, -fPIE
61#
62#### fstack-flags ####
63# hooked function for hardened gcc that appends
64# -fno-stack-protector to {C,CXX,LD}FLAGS
65# when a package is filtering -fstack-protector, -fstack-protector-all
66# notice: modern automatic specs files will also suppress -fstack-protector-all
67# when only -fno-stack-protector is given
68#
31 69
70# C[XX]FLAGS that we allow in strip-flags
71setup-allowed-flags() {
72 if [ -z "${ALLOWED_FLAGS}" ] ; then
32ALLOWED_FLAGS="-O -mcpu -march -mtune -fstack-protector -pipe -g" 73 export ALLOWED_FLAGS="-O -O1 -O2 -mcpu -march -mtune -fstack-protector -fno-unit-at-a-time -pipe -g"
74 case "${ARCH}" in
75 mips) ALLOWED_FLAGS="${ALLOWED_FLAGS} -mips1 -mips2 -mips3 -mips4 -mabi" ;;
76 amd64) ALLOWED_FLAGS="${ALLOWED_FLAGS} -fPIC -m64" ;;
77 x86) ALLOWED_FLAGS="${ALLOWED_FLAGS} -m32" ;;
78 alpha) ALLOWED_FLAGS="${ALLOWED_FLAGS} -fPIC" ;;
79 ia64) ALLOWED_FLAGS="${ALLOWED_FLAGS} -fPIC" ;;
80 esac
81 fi
33 82
83 # C[XX]FLAGS that we are think is ok, but needs testing
84 # NOTE: currently -Os have issues with gcc3 and K6* arch's
85 export UNSTABLE_FLAGS="-Os -O3 -freorder-blocks -fprefetch-loop-arrays"
86 return 0
87}
34 88
35filter-flags () { 89filter-flags() {
90 local x f fset
91 declare -a new_CFLAGS new_CXXFLAGS
36 92
37 for x in $1 93 for x in "$@" ; do
94 case "${x}" in
95 -fPIC|-fpic|-fPIE|-fpie|-pie) etexec-flags;;
96 -fstack-protector|-fstack-protector-all) fstack-flags;;
97 esac
38 do 98 done
39 export CFLAGS="${CFLAGS/${x}}" 99
40 export CXXFLAGS="${CXXFLAGS/${x}}" 100 for fset in CFLAGS CXXFLAGS; do
101 for f in ${!fset}; do
102 for x in "$@"; do
103 # Note this should work with globs like -O*
104 [[ ${f} == ${x} ]] && continue 2
105 done
106 eval new_${fset}\[\${\#new_${fset}\[@]}]=\${f}
41 done 107 done
108 eval export ${fset}=\${new_${fset}\[*]}
109 done
42 110
111 return 0
43} 112}
44 113
114filter-lfs-flags() {
115 filter-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
116}
117
118append-lfs-flags() {
119 append-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
120}
121
45append-flags () { 122append-flags() {
46
47 CFLAGS="${CFLAGS} $1" 123 export CFLAGS="${CFLAGS} $*"
48 CXXFLAGS="${CXXFLAGS} $1" 124 export CXXFLAGS="${CXXFLAGS} $*"
49 125 [ -n "`is-flag -fno-stack-protector`" -o \
126 -n "`is-flag -fno-stack-protector-all`" ] && fstack-flags
127 return 0
50} 128}
51 129
52replace-flags () { 130replace-flags() {
53 131 # we do this fancy spacing stuff so as to not filter
132 # out part of a flag ... we want flag atoms ! :D
133 CFLAGS=" ${CFLAGS} "
134 CXXFLAGS=" ${CXXFLAGS} "
54 CFLAGS="${CFLAGS/${1}/${2} }" 135 CFLAGS="${CFLAGS// ${1} / ${2} }"
55 CXXFLAGS="${CXXFLAGS/${1}/${2} }" 136 CXXFLAGS="${CXXFLAGS// ${1} / ${2} }"
137 CFLAGS="${CFLAGS:1:${#CFLAGS}-2}"
138 CXXFLAGS="${CXXFLAGS:1:${#CXXFLAGS}-2}"
139 export CFLAGS CXXFLAGS
140 return 0
141}
56 142
143replace-cpu-flags() {
144 local oldcpu newcpu="$1" ; shift
145 for oldcpu in "$@" ; do
146 replace-flags -march=${oldcpu} -march=${newcpu}
147 replace-flags -mcpu=${oldcpu} -mcpu=${newcpu}
148 replace-flags -mtune=${oldcpu} -mtune=${newcpu}
149 done
150 return 0
57} 151}
58 152
59is-flag() { 153is-flag() {
154 local x
60 155
61 for x in ${CFLAGS} ${CXXFLAGS} 156 for x in ${CFLAGS} ${CXXFLAGS} ; do
62 do
63 if [ "${x}" = "$1" ] 157 if [ "${x}" == "$1" ] ; then
64 then
65 echo true 158 echo true
66 break 159 return 0
67 fi 160 fi
68 done 161 done
162 return 1
163}
69 164
165filter-mfpmath() {
166 local orig_mfpmath new_math prune_math
167
168 # save the original -mfpmath flag
169 orig_mfpmath="`get-flag -mfpmath`"
170 # get the value of the current -mfpmath flag
171 new_math=" `get-flag mfpmath | tr , ' '` "
172 # figure out which math values are to be removed
173 prune_math=""
174 for prune_math in "$@" ; do
175 new_math="${new_math/ ${prune_math} / }"
176 done
177 new_math="`echo ${new_math:1:${#new_math}-2} | tr ' ' ,`"
178
179 if [ -z "${new_math}" ] ; then
180 # if we're removing all user specified math values are
181 # slated for removal, then we just filter the flag
182 filter-flags ${orig_mfpmath}
183 else
184 # if we only want to filter some of the user specified
185 # math values, then we replace the current flag
186 replace-flags ${orig_mfpmath} -mfpmath=${new_math}
187 fi
188 return 0
70} 189}
71 190
72strip-flags() { 191strip-flags() {
192 local x y flag NEW_CFLAGS NEW_CXXFLAGS
193
194 setup-allowed-flags
73 195
74 local NEW_CFLAGS="" 196 local NEW_CFLAGS=""
75 local NEW_CXXFLAGS="" 197 local NEW_CXXFLAGS=""
76 198
77 set -f 199 # Allow unstable C[XX]FLAGS if we are using unstable profile ...
200 if has ~${ARCH} ${ACCEPT_KEYWORDS} ; then
201 use debug && einfo "Enabling the use of some unstable flags"
202 ALLOWED_FLAGS="${ALLOWED_FLAGS} ${UNSTABLE_FLAGS}"
203 fi
78 204
205 set -f # disable pathname expansion
206
79 for x in ${CFLAGS} 207 for x in ${CFLAGS}; do
80 do
81 for y in ${ALLOWED_FLAGS} 208 for y in ${ALLOWED_FLAGS}; do
82 do
83 flag=${x%%=*} 209 flag=${x%%=*}
84 if [ "${flag%%${y}}" = "" ] 210 if [ "${flag%%${y}}" = "" ]; then
85 then
86 NEW_CFLAGS="${NEW_CFLAGS} ${x}" 211 NEW_CFLAGS="${NEW_CFLAGS} ${x}"
87 break 212 break
88 fi 213 fi
89 done 214 done
90 done 215 done
91 216
92 for x in ${CXXFLAGS} 217 for x in ${CXXFLAGS}; do
93 do
94 for y in ${ALLOWED_FLAGS} 218 for y in ${ALLOWED_FLAGS}; do
95 do
96 flag=${x%%=*} 219 flag=${x%%=*}
97 if [ "${flag%%${y}}" = "" ] 220 if [ "${flag%%${y}}" = "" ]; then
98 then
99 NEW_CXXFLAGS="${NEW_CXXFLAGS} ${x}" 221 NEW_CXXFLAGS="${NEW_CXXFLAGS} ${x}"
100 break 222 break
101 fi 223 fi
102 done 224 done
103 done 225 done
104 226
105 set +f 227 # In case we filtered out all optimization flags fallback to -O2
228 if [ "${CFLAGS/-O}" != "${CFLAGS}" -a "${NEW_CFLAGS/-O}" = "${NEW_CFLAGS}" ]; then
229 NEW_CFLAGS="${NEW_CFLAGS} -O2"
230 fi
231 if [ "${CXXFLAGS/-O}" != "${CXXFLAGS}" -a "${NEW_CXXFLAGS/-O}" = "${NEW_CXXFLAGS}" ]; then
232 NEW_CXXFLAGS="${NEW_CXXFLAGS} -O2"
233 fi
234
235 set +f # re-enable pathname expansion
106 236
107 export CFLAGS="${NEW_CFLAGS}" 237 export CFLAGS="${NEW_CFLAGS}"
108 export CXXFLAGS="${NEW_CXXFLAGS}" 238 export CXXFLAGS="${NEW_CXXFLAGS}"
239 return 0
240}
241
242test_flag() {
243 local cc=${CC:-gcc} ; cc=${cc%% *}
244 if ${cc} -S -xc "$@" -o /dev/null /dev/null &>/dev/null; then
245 printf "%s\n" "$*"
246 return 0
247 fi
248 return 1
249}
250
251test_version_info() {
252 local cc=${CC:-gcc} ; cc=${cc%% *}
253 if [[ $(${cc} --version 2>&1) == *$1* ]]; then
254 return 0
255 else
256 return 1
257 fi
258}
259
260strip-unsupported-flags() {
261 local NEW_CFLAGS NEW_CXXFLAGS
262
263 for x in ${CFLAGS} ; do
264 NEW_CFLAGS="${NEW_CFLAGS} `test_flag ${x}`"
265 done
266 for x in ${CXXFLAGS} ; do
267 NEW_CXXFLAGS="${NEW_CXXFLAGS} `test_flag ${x}`"
268 done
269
270 export CFLAGS="${NEW_CFLAGS}"
271 export CXXFLAGS="${NEW_CXXFLAGS}"
109} 272}
110 273
111get-flag() { 274get-flag() {
112 local findflag="$1" 275 local f findflag="$1"
113 276
277 # this code looks a little flaky but seems to work for
278 # everything we want ...
279 # for example, if CFLAGS="-march=i686":
280 # `get-flag -march` == "-march=i686"
281 # `get-flag march` == "i686"
114 for f in ${CFLAGS} ${CXXFLAGS} ; do 282 for f in ${CFLAGS} ${CXXFLAGS} ; do
115 if [ "${f/${findflag}}" != "${f}" ] ; then 283 if [ "${f/${findflag}}" != "${f}" ] ; then
116 echo "${f/-${findflag}=}" 284 printf "%s\n" "${f/-${findflag}=}"
117 return 285 return 0
118 fi 286 fi
119 done 287 done
288 return 1
120} 289}
290
291has_hardened() {
292 test_version_info Hardened
293 return $?
294}
295
296has_pic() {
297 [ "${CFLAGS/-fPIC}" != "${CFLAGS}" ] && return 0
298 [ "${CFLAGS/-fpic}" != "${CFLAGS}" ] && return 0
299 test_version_info pie && return 0
300 return 1
301}
302
303has_pie() {
304 [ "${CFLAGS/-fPIE}" != "${CFLAGS}" ] && return 0
305 [ "${CFLAGS/-fpie}" != "${CFLAGS}" ] && return 0
306 test_version_info pie && return 0
307 return 1
308}
309
310has_ssp() {
311 [ "${CFLAGS/-fstack-protector}" != "${CFLAGS}" ] && return 0
312 test_version_info ssp && return 0
313 return 1
314}
315
316has_m64() {
317 # this doesnt test if the flag is accepted, it tests if the flag
318 # actually -WORKS-. non-multilib gcc will take both -m32 and -m64!
319 # please dont replace this function with test_flag in some future
320 # clean-up!
321 temp=`mktemp`
322 echo "int main() { return(0); }" > ${temp}.c
323 ${CC/ .*/} -m64 -o /dev/null ${temp}.c > /dev/null 2>&1
324 ret=$?
325 rm -f ${temp}.c
326 [ "$ret" != "1" ] && return 0
327 return 1
328}
329
330has_m32() {
331 # this doesnt test if the flag is accepted, it tests if the flag
332 # actually -WORKS-. non-multilib gcc will take both -m32 and -m64!
333 # please dont replace this function with test_flag in some future
334 # clean-up!
335 temp=`mktemp`
336 echo "int main() { return(0); }" > ${temp}.c
337 ${CC/ .*/} -m32 -o /dev/null ${temp}.c > /dev/null 2>&1
338 ret=$?
339 rm -f ${temp}.c
340 [ "$ret" != "1" ] && return 0
341 return 1
342}
343
344replace-sparc64-flags() {
345 local SPARC64_CPUS="ultrasparc v9"
346
347 if [ "${CFLAGS/mtune}" != "${CFLAGS}" ]; then
348 for x in ${SPARC64_CPUS}; do
349 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8}"
350 done
351 else
352 for x in ${SPARC64_CPUS}; do
353 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
354 done
355 fi
356
357 if [ "${CXXFLAGS/mtune}" != "${CXXFLAGS}" ]; then
358 for x in ${SPARC64_CPUS}; do
359 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8}"
360 done
361 else
362 for x in ${SPARC64_CPUS}; do
363 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
364 done
365 fi
366
367 export CFLAGS CXXFLAGS
368}
369
370append-ldflags() {
371 export LDFLAGS="${LDFLAGS} $*"
372 return 0
373}
374
375filter-ldflags() {
376 local x
377
378 # we do this fancy spacing stuff so as to not filter
379 # out part of a flag ... we want flag atoms ! :D
380 LDFLAGS=" ${LDFLAGS} "
381 for x in "$@" ; do
382 LDFLAGS="${LDFLAGS// ${x} / }"
383 done
384 LDFLAGS="${LDFLAGS:1:${#LDFLAGS}-2}"
385 export LDFLAGS
386 return 0
387}
388
389etexec-flags() {
390 # if you're not using a hardened compiler you wont need this
391 # PIC/no-pic kludge in the first place.
392 has_hardened || return 0
393
394 if has_pie || has_pic; then
395 [ -z "`is-flag -fno-pic`" ] &&
396 export CFLAGS="${CFLAGS} `test_flag -fno-pic`"
397 [ -z "`is-flag -nopie`" ] &&
398 export CFLAGS="${CFLAGS} `test_flag -nopie`"
399 fi
400 return 0
401}
402
403fstack-flags() {
404 if has_ssp; then
405 [ -z "`is-flag -fno-stack-protector`" ] &&
406 export CFLAGS="${CFLAGS} `test_flag -fno-stack-protector`"
407 fi
408 return 0
409}

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