/[gentoo-x86]/eclass/flag-o-matic.eclass
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Revision 1.11 Revision 1.71
1# Copyright 1999-2002 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 1.71 2004/10/01 10:00:36 robbat2 Exp $
4#
3# Author Bart Verwilst <verwilst@gentoo.org> 5# Author Bart Verwilst <verwilst@gentoo.org>
4# $Header: /var/cvsroot/gentoo-x86/eclass/flag-o-matic.eclass,v 1.11 2002/12/22 12:11:56 cretin Exp $
5 6
6ECLASS=flag-o-matic 7ECLASS=flag-o-matic
7INHERITED="$INHERITED $ECLASS" 8INHERITED="$INHERITED $ECLASS"
8 9
10# Please leave ${IUSE} in this until portage .51 is stable, otherwise
11# IUSE gets clobbered.
12IUSE="${IUSE} debug"
13
9# 14#
10#### filter-flags <flag> #### 15#### filter-flags <flags> ####
11# Remove particular flags from C[XX]FLAGS 16# Remove particular flags from C[XX]FLAGS
17# Matches only complete flags
12# 18#
13#### append-flags <flag> #### 19#### append-flags <flags> ####
14# Add extra flags to your current C[XX]FLAGS 20# Add extra flags to your current C[XX]FLAGS
15# 21#
16#### replace-flags <orig.flag> <new.flag> ### 22#### replace-flags <orig.flag> <new.flag> ###
17# Replace a flag by another one 23# Replace a flag by another one
18# 24#
25#### replace-cpu-flags <old.cpus> <new.cpu> ###
26# Replace march/mcpu flags that specify <old.cpus>
27# with flags that specify <new.cpu>
28#
19#### is-flag <flag> #### 29#### is-flag <flag> ####
20# Returns "true" if flag is set in C[XX]FLAGS 30# Returns "true" if flag is set in C[XX]FLAGS
21# Matches only complete flag 31# Matches only complete a flag
22# 32#
23#### strip-flags #### 33#### strip-flags ####
24# Strip C[XX]FLAGS of everything except known 34# Strip C[XX]FLAGS of everything except known
25# good options. 35# good options.
26# 36#
37#### strip-unsupported-flags ####
38# Strip C[XX]FLAGS of any flags not supported by
39# installed version of gcc
40#
27#### get-flag <flag> #### 41#### get-flag <flag> ####
28# Find and echo the value for a particular flag 42# Find and echo the value for a particular flag
29# 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#
30 72
73# C[XX]FLAGS that we allow in strip-flags
74setup-allowed-flags() {
75 if [ -z "${ALLOWED_FLAGS}" ] ; then
76 export ALLOWED_FLAGS="-O -O1 -O2 -mcpu -march -mtune -fstack-protector -fno-stack-protector -fno-pie -fno-unit-at-a-time -pipe -g"
77 case "${ARCH}" in
78 mips) ALLOWED_FLAGS="${ALLOWED_FLAGS} -mips1 -mips2 -mips3 -mips4 -mips32 -mips64 -mips16 -EL -EB -mabi" ;;
79 amd64) ALLOWED_FLAGS="${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"
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}
97
31filter-flags () { 98filter-flags() {
99 local x f fset
100 declare -a new_CFLAGS new_CXXFLAGS
32 101
33 for x in $1 102 for x in "$@" ; do
103 case "${x}" in
104 -fPIC|-fpic|-fPIE|-fpie|-pie) etexec-flags;;
105 -fstack-protector|-fstack-protector-all) fstack-flags;;
106 esac
34 do 107 done
35 export CFLAGS="${CFLAGS/${x}}" 108
36 export CXXFLAGS="${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}
37 done 120 done
121 eval export ${fset}=\${new_${fset}\[*]}
122 done
38 123
124 return 0
39} 125}
40 126
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
41append-flags () { 135append-flags() {
42
43 CFLAGS="${CFLAGS} $1" 136 export CFLAGS="${CFLAGS} $*"
44 CXXFLAGS="${CXXFLAGS} $1" 137 export CXXFLAGS="${CXXFLAGS} $*"
45 138 [ -n "`is-flag -fno-stack-protector`" -o \
139 -n "`is-flag -fno-stack-protector-all`" ] && fstack-flags
140 return 0
46} 141}
47 142
48replace-flags () { 143replace-flags() {
144 local f fset
145 declare -a new_CFLAGS new_CXXFLAGS
49 146
50 CFLAGS="${CFLAGS/${1}/${2} }" 147 for fset in CFLAGS CXXFLAGS; do
51 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
52 159
160 return 0
161}
162
163replace-cpu-flags() {
164 local newcpu="$#" ; newcpu="${!newcpu}"
165 while [ $# -gt 1 ] ; do
166 # quote to make sure that no globbing is done (particularly on
167 # ${oldcpu} prior to calling replace-flags
168 replace-flags "-march=${1}" "-march=${newcpu}"
169 replace-flags "-mcpu=${1}" "-mcpu=${newcpu}"
170 replace-flags "-mtune=${1}" "-mtune=${newcpu}"
171 shift
172 done
173 return 0
53} 174}
54 175
55is-flag() { 176is-flag() {
177 local x
56 178
57 for x in ${CFLAGS} ${CXXFLAGS} 179 for x in ${CFLAGS} ${CXXFLAGS} ; do
58 do 180 # Note this should work with globs like -mcpu=ultrasparc*
59 if [ "${x}" = "$1" ] 181 if [[ ${x} == ${1} ]]; then
60 then
61 echo true 182 echo true
62 break 183 return 0
63 fi 184 fi
64 done 185 done
186 return 1
187}
65 188
189filter-mfpmath() {
190 local orig_mfpmath new_math prune_math
191
192 # save the original -mfpmath flag
193 orig_mfpmath="`get-flag -mfpmath`"
194 # get the value of the current -mfpmath flag
195 new_math=" `get-flag mfpmath | tr , ' '` "
196 # figure out which math values are to be removed
197 prune_math=""
198 for prune_math in "$@" ; do
199 new_math="${new_math/ ${prune_math} / }"
200 done
201 new_math="`echo ${new_math:1:${#new_math}-2} | tr ' ' ,`"
202
203 if [ -z "${new_math}" ] ; then
204 # if we're removing all user specified math values are
205 # slated for removal, then we just filter the flag
206 filter-flags ${orig_mfpmath}
207 else
208 # if we only want to filter some of the user specified
209 # math values, then we replace the current flag
210 replace-flags ${orig_mfpmath} -mfpmath=${new_math}
211 fi
212 return 0
66} 213}
67 214
68strip-flags() { 215strip-flags() {
216 local x y flag NEW_CFLAGS NEW_CXXFLAGS
217
218 setup-allowed-flags
69 219
70 local NEW_CFLAGS="" 220 local NEW_CFLAGS=""
71 local NEW_CXXFLAGS="" 221 local NEW_CXXFLAGS=""
72 222
73 local ALLOWED_FLAGS="-O -mcpu -march -pipe -g" 223 # Allow unstable C[XX]FLAGS if we are using unstable profile ...
224 if has ~${ARCH} ${ACCEPT_KEYWORDS} ; then
225 use debug && einfo "Enabling the use of some unstable flags"
226 ALLOWED_FLAGS="${ALLOWED_FLAGS} ${UNSTABLE_FLAGS}"
227 fi
74 228
75 set -f 229 set -f # disable pathname expansion
76 230
77 for x in ${CFLAGS} 231 for x in ${CFLAGS}; do
78 do
79 for y in ${ALLOWED_FLAGS} 232 for y in ${ALLOWED_FLAGS}; do
80 do 233 flag=${x%%=*}
81 if [ "${x/${y}}" != "${x}" ] 234 if [ "${flag%%${y}}" = "" ] ; then
82 then
83 if [ -z "${NEW_CFLAGS}" ]
84 then
85 NEW_CFLAGS="${x}"
86 else
87 NEW_CFLAGS="${NEW_CFLAGS} ${x}" 235 NEW_CFLAGS="${NEW_CFLAGS} ${x}"
88 fi 236 break
89 fi 237 fi
90 done 238 done
91 done 239 done
92 240
93 for x in ${CXXFLAGS} 241 for x in ${CXXFLAGS}; do
94 do
95 for y in ${ALLOWED_FLAGS} 242 for y in ${ALLOWED_FLAGS}; do
96 do 243 flag=${x%%=*}
97 if [ "${x/${y}}" != "${x}" ] 244 if [ "${flag%%${y}}" = "" ] ; then
98 then
99 if [ -z "${NEW_CXXFLAGS}" ]
100 then
101 NEW_CXXFLAGS="${x}"
102 else
103 NEW_CXXFLAGS="${NEW_CXXFLAGS} ${x}" 245 NEW_CXXFLAGS="${NEW_CXXFLAGS} ${x}"
104 fi 246 break
105 fi 247 fi
106 done 248 done
107 done 249 done
108 250
109 set +f 251 # In case we filtered out all optimization flags fallback to -O2
252 if [ "${CFLAGS/-O}" != "${CFLAGS}" -a "${NEW_CFLAGS/-O}" = "${NEW_CFLAGS}" ]; then
253 NEW_CFLAGS="${NEW_CFLAGS} -O2"
254 fi
255 if [ "${CXXFLAGS/-O}" != "${CXXFLAGS}" -a "${NEW_CXXFLAGS/-O}" = "${NEW_CXXFLAGS}" ]; then
256 NEW_CXXFLAGS="${NEW_CXXFLAGS} -O2"
257 fi
258
259 set +f # re-enable pathname expansion
110 260
111 export CFLAGS="${NEW_CFLAGS}" 261 export CFLAGS="${NEW_CFLAGS}"
112 export CXXFLAGS="${NEW_CXXFLAGS}" 262 export CXXFLAGS="${NEW_CXXFLAGS}"
263 return 0
264}
265
266test_flag() {
267 local cc=${CC:-gcc} ; cc=${cc%% *}
268 if ${cc} -S -xc "$@" -o /dev/null /dev/null &>/dev/null; then
269 printf "%s\n" "$*"
270 return 0
271 fi
272 return 1
273}
274
275test_version_info() {
276 local cc=${CC:-gcc} ; cc=${cc%% *}
277 if [[ $(${cc} --version 2>&1) == *$1* ]]; then
278 return 0
279 else
280 return 1
281 fi
282}
283
284strip-unsupported-flags() {
285 local NEW_CFLAGS NEW_CXXFLAGS
286
287 for x in ${CFLAGS} ; do
288 NEW_CFLAGS="${NEW_CFLAGS} `test_flag ${x}`"
289 done
290 for x in ${CXXFLAGS} ; do
291 NEW_CXXFLAGS="${NEW_CXXFLAGS} `test_flag ${x}`"
292 done
293
294 export CFLAGS="${NEW_CFLAGS}"
295 export CXXFLAGS="${NEW_CXXFLAGS}"
113} 296}
114 297
115get-flag() { 298get-flag() {
116 local findflag="$1" 299 local f findflag="$1"
117 300
301 # this code looks a little flaky but seems to work for
302 # everything we want ...
303 # for example, if CFLAGS="-march=i686":
304 # `get-flag -march` == "-march=i686"
305 # `get-flag march` == "i686"
118 for f in ${CFLAGS} ${CXXFLAGS} ; do 306 for f in ${CFLAGS} ${CXXFLAGS} ; do
119 if [ "${f/${findflag}}" != "${f}" ] ; then 307 if [ "${f/${findflag}}" != "${f}" ] ; then
120 echo "${f/-${findflag}=}" 308 printf "%s\n" "${f/-${findflag}=}"
121 return 309 return 0
122 fi 310 fi
123 done 311 done
312 return 1
124} 313}
314
315has_hardened() {
316 test_version_info Hardened && return 0
317 # the specs file wont exist unless gcc has GCC_SPECS support
318 [ -f "${GCC_SPECS}" -a "${GCC_SPECS}" != "${GCC_SPECS/hardened/}" ] && \
319 return 0
320 return 1
321}
322
323has_pic() {
324 [ "${CFLAGS/-fPIC}" != "${CFLAGS}" ] && return 0
325 [ "${CFLAGS/-fpic}" != "${CFLAGS}" ] && return 0
326 test_version_info pie && return 0
327 return 1
328}
329
330has_pie() {
331 [ "${CFLAGS/-fPIE}" != "${CFLAGS}" ] && return 0
332 [ "${CFLAGS/-fpie}" != "${CFLAGS}" ] && return 0
333 test_version_info pie && return 0
334 return 1
335}
336
337has_ssp() {
338 [ "${CFLAGS/-fstack-protector}" != "${CFLAGS}" ] && return 0
339 test_version_info ssp && return 0
340 return 1
341}
342
343has_m64() {
344 # this doesnt test if the flag is accepted, it tests if the flag
345 # actually -WORKS-. non-multilib gcc will take both -m32 and -m64!
346 # please dont replace this function with test_flag in some future
347 # clean-up!
348 temp=`mktemp`
349 echo "int main() { return(0); }" > ${temp}.c
350 ${CC/ .*/} -m64 -o /dev/null ${temp}.c > /dev/null 2>&1
351 ret=$?
352 rm -f ${temp}.c
353 [ "$ret" != "1" ] && return 0
354 return 1
355}
356
357has_m32() {
358 # this doesnt test if the flag is accepted, it tests if the flag
359 # actually -WORKS-. non-multilib gcc will take both -m32 and -m64!
360 # please dont replace this function with test_flag in some future
361 # clean-up!
362 temp=`mktemp`
363 echo "int main() { return(0); }" > ${temp}.c
364 ${CC/ .*/} -m32 -o /dev/null ${temp}.c > /dev/null 2>&1
365 ret=$?
366 rm -f ${temp}.c
367 [ "$ret" != "1" ] && return 0
368 return 1
369}
370
371replace-sparc64-flags() {
372 local SPARC64_CPUS="ultrasparc v9"
373
374 if [ "${CFLAGS/mtune}" != "${CFLAGS}" ]; then
375 for x in ${SPARC64_CPUS}; do
376 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8}"
377 done
378 else
379 for x in ${SPARC64_CPUS}; do
380 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
381 done
382 fi
383
384 if [ "${CXXFLAGS/mtune}" != "${CXXFLAGS}" ]; then
385 for x in ${SPARC64_CPUS}; do
386 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8}"
387 done
388 else
389 for x in ${SPARC64_CPUS}; do
390 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
391 done
392 fi
393
394 export CFLAGS CXXFLAGS
395}
396
397append-ldflags() {
398 export LDFLAGS="${LDFLAGS} $*"
399 return 0
400}
401
402filter-ldflags() {
403 local x
404
405 # we do this fancy spacing stuff so as to not filter
406 # out part of a flag ... we want flag atoms ! :D
407 LDFLAGS=" ${LDFLAGS} "
408 for x in "$@" ; do
409 LDFLAGS="${LDFLAGS// ${x} / }"
410 done
411 LDFLAGS="${LDFLAGS:1:${#LDFLAGS}-2}"
412 export LDFLAGS
413 return 0
414}
415
416etexec-flags() {
417 # if you're not using a hardened compiler you wont need this
418 # PIC/no-pic kludge in the first place.
419 has_hardened || return 0
420 # this kludge breaks on amd64, and probably other -fPIC dependant
421 # archs.
422 use amd64 && return 0
423
424 if has_pie || has_pic; then
425 [ -z "`is-flag -fno-pic`" ] &&
426 export CFLAGS="${CFLAGS} `test_flag -fno-pic`"
427 [ -z "`is-flag -nopie`" ] &&
428 export CFLAGS="${CFLAGS} `test_flag -nopie`"
429 fi
430 return 0
431}
432
433fstack-flags() {
434 if has_ssp; then
435 [ -z "`is-flag -fno-stack-protector`" ] &&
436 export CFLAGS="${CFLAGS} `test_flag -fno-stack-protector`"
437 fi
438 return 0
439}

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