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Revision 1.15 Revision 1.87
1# Copyright 1999-2003 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# $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 1.87 2005/06/24 22:06:19 vapier Exp $
4#
5# Author Bart Verwilst <verwilst@gentoo.org>
6 4
7ECLASS=flag-o-matic 5ECLASS=flag-o-matic
8INHERITED="$INHERITED $ECLASS" 6INHERITED="$INHERITED $ECLASS"
9 7
8# need access to emktemp()
9inherit eutils toolchain-funcs multilib
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 <old.cpus> <new.cpu> ###
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#### fstack-flags ####
58# hooked function for hardened gcc that appends
59# -fno-stack-protector to {C,CXX,LD}FLAGS
60# when a package is filtering -fstack-protector, -fstack-protector-all
61# notice: modern automatic specs files will also suppress -fstack-protector-all
62# when only -fno-stack-protector is given
63#
64#### has_pic ####
65# Returns true if the compiler by default or with current CFLAGS
66# builds position-independent code.
67#
68#### has_ssp_all ####
69# Returns true if the compiler by default or with current CFLAGS
70# generates stack smash protections for all functions
71#
72#### has_ssp ####
73# Returns true if the compiler by default or with current CFLAGS
74# generates stack smash protections for most vulnerable functions
75#
31 76
32ALLOWED_FLAGS="-O -mcpu -march -mtune -fstack-protector -pipe -g" 77# C[XX]FLAGS that we allow in strip-flags
78setup-allowed-flags() {
79 if [[ -z ${ALLOWED_FLAGS} ]] ; then
80 export ALLOWED_FLAGS="-pipe"
81 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -O -O0 -O1 -O2 -mcpu -march -mtune"
82 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -fstack-protector -fstack-protector-all"
83 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -fbounds-checking -fno-bounds-checking"
84 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -fno-pie -fno-unit-at-a-time"
85 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -g -g0 -g1 -g2 -g3 -ggdb -ggdb0 -ggdb1 -ggdb2 -ggdb3"
86 fi
87 # allow a bunch of flags that negate features / control ABI
88 ALLOWED_FLAGS="${ALLOWED_FLAGS} -fno-stack-protector -fno-stack-protector-all"
89 ALLOWED_FLAGS="${ALLOWED_FLAGS} -mregparm -mno-app-regs -mapp-regs \
90 -mno-mmx -mno-sse -mno-sse2 -mno-sse3 -mno-3dnow \
91 -mips1 -mips2 -mips3 -mips4 -mips32 -mips64 -mips16 \
92 -msoft-float -mno-soft-float -mhard-float -mno-hard-float -mfpu \
93 -mflat -mno-flat -mno-faster-structs -mfaster-structs \
94 -m32 -m64 -mabi -mlittle-endian -mbig-endian -EL -EB -fPIC \
95 -mlive-g0 -mcmodel -mstack-bias -mno-stack-bias"
33 96
97 # C[XX]FLAGS that we are think is ok, but needs testing
98 # NOTE: currently -Os have issues with gcc3 and K6* arch's
99 export UNSTABLE_FLAGS="-Os -O3 -freorder-blocks -fprefetch-loop-arrays"
100 return 0
101}
34 102
35filter-flags () { 103filter-flags() {
104 local x f fset
105 declare -a new_CFLAGS new_CXXFLAGS
36 106
37 for x in $1 107 for x in "$@" ; do
108 case "${x}" in
109 -fPIC|-fpic|-fPIE|-fpie|-pie)
110 append-flags `test_flag -fno-pie`;;
111 -fstack-protector|-fstack-protector-all)
112 fstack-flags;;
113 esac
38 do 114 done
39 export CFLAGS="${CFLAGS/${x}}" 115
40 export CXXFLAGS="${CXXFLAGS/${x}}" 116 for fset in CFLAGS CXXFLAGS; do
117 # Looping over the flags instead of using a global
118 # substitution ensures that we're working with flag atoms.
119 # Otherwise globs like -O* have the potential to wipe out the
120 # list of flags.
121 for f in ${!fset}; do
122 for x in "$@"; do
123 # Note this should work with globs like -O*
124 [[ ${f} == ${x} ]] && continue 2
125 done
126 eval new_${fset}\[\${\#new_${fset}\[@]}]=\${f}
41 done 127 done
128 eval export ${fset}=\${new_${fset}\[*]}
129 done
42 130
131 return 0
43} 132}
44 133
134filter-lfs-flags() {
135 filter-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
136}
137
138append-lfs-flags() {
139 append-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
140}
141
45append-flags () { 142append-flags() {
46 143 [[ -z $* ]] && return 0
47 CFLAGS="${CFLAGS} $1" 144 export CFLAGS="${CFLAGS} $*"
48 CXXFLAGS="${CXXFLAGS} $1" 145 export CXXFLAGS="${CXXFLAGS} $*"
49 146 [ -n "`is-flag -fno-stack-protector`" -o \
147 -n "`is-flag -fno-stack-protector-all`" ] && fstack-flags
148 return 0
50} 149}
51 150
52replace-flags () { 151replace-flags() {
152 local f fset
153 declare -a new_CFLAGS new_CXXFLAGS
53 154
54 CFLAGS="${CFLAGS/${1}/${2} }" 155 for fset in CFLAGS CXXFLAGS; do
55 CXXFLAGS="${CXXFLAGS/${1}/${2} }" 156 # Looping over the flags instead of using a global
157 # substitution ensures that we're working with flag atoms.
158 # Otherwise globs like -O* have the potential to wipe out the
159 # list of flags.
160 for f in ${!fset}; do
161 # Note this should work with globs like -O*
162 [[ ${f} == ${1} ]] && f=${2}
163 eval new_${fset}\[\${\#new_${fset}\[@]}]=\${f}
164 done
165 eval export ${fset}=\${new_${fset}\[*]}
166 done
56 167
168 return 0
169}
170
171replace-cpu-flags() {
172 local newcpu="$#" ; newcpu="${!newcpu}"
173 while [ $# -gt 1 ] ; do
174 # quote to make sure that no globbing is done (particularly on
175 # ${oldcpu} prior to calling replace-flags
176 replace-flags "-march=${1}" "-march=${newcpu}"
177 replace-flags "-mcpu=${1}" "-mcpu=${newcpu}"
178 replace-flags "-mtune=${1}" "-mtune=${newcpu}"
179 shift
180 done
181 return 0
57} 182}
58 183
59is-flag() { 184is-flag() {
185 local x
60 186
61 for x in ${CFLAGS} ${CXXFLAGS} 187 for x in ${CFLAGS} ${CXXFLAGS} ; do
62 do 188 # Note this should work with globs like -mcpu=ultrasparc*
63 if [ "${x}" = "$1" ] 189 if [[ ${x} == ${1} ]]; then
64 then
65 echo true 190 echo true
66 break 191 return 0
67 fi 192 fi
68 done 193 done
194 return 1
195}
69 196
197filter-mfpmath() {
198 local orig_mfpmath new_math prune_math
199
200 # save the original -mfpmath flag
201 orig_mfpmath="`get-flag -mfpmath`"
202 # get the value of the current -mfpmath flag
203 new_math=" `get-flag mfpmath | tr , ' '` "
204 # figure out which math values are to be removed
205 prune_math=""
206 for prune_math in "$@" ; do
207 new_math="${new_math/ ${prune_math} / }"
208 done
209 new_math="`echo ${new_math:1:${#new_math}-2} | tr ' ' ,`"
210
211 if [ -z "${new_math}" ] ; then
212 # if we're removing all user specified math values are
213 # slated for removal, then we just filter the flag
214 filter-flags ${orig_mfpmath}
215 else
216 # if we only want to filter some of the user specified
217 # math values, then we replace the current flag
218 replace-flags ${orig_mfpmath} -mfpmath=${new_math}
219 fi
220 return 0
70} 221}
71 222
72strip-flags() { 223strip-flags() {
224 local x y flag NEW_CFLAGS NEW_CXXFLAGS
225
226 setup-allowed-flags
73 227
74 local NEW_CFLAGS="" 228 local NEW_CFLAGS=""
75 local NEW_CXXFLAGS="" 229 local NEW_CXXFLAGS=""
76 230
77 set -f 231 # Allow unstable C[XX]FLAGS if we are using unstable profile ...
232 if has ~$(tc-arch) ${ACCEPT_KEYWORDS} ; then
233 ALLOWED_FLAGS="${ALLOWED_FLAGS} ${UNSTABLE_FLAGS}"
234 fi
78 235
236 set -f # disable pathname expansion
237
79 for x in ${CFLAGS} 238 for x in ${CFLAGS}; do
80 do
81 for y in ${ALLOWED_FLAGS} 239 for y in ${ALLOWED_FLAGS}; do
82 do
83 flag=${x%%=*} 240 flag=${x%%=*}
84 if [ "${flag%%${y}}" = "" ] 241 if [ "${flag%%${y}}" = "" ] ; then
85 then
86 NEW_CFLAGS="${NEW_CFLAGS} ${x}" 242 NEW_CFLAGS="${NEW_CFLAGS} ${x}"
87 break 243 break
88 fi 244 fi
89 done 245 done
90 done 246 done
91 247
92 for x in ${CXXFLAGS} 248 for x in ${CXXFLAGS}; do
93 do
94 for y in ${ALLOWED_FLAGS} 249 for y in ${ALLOWED_FLAGS}; do
95 do
96 flag=${x%%=*} 250 flag=${x%%=*}
97 if [ "${flag%%${y}}" = "" ] 251 if [ "${flag%%${y}}" = "" ] ; then
98 then
99 NEW_CXXFLAGS="${NEW_CXXFLAGS} ${x}" 252 NEW_CXXFLAGS="${NEW_CXXFLAGS} ${x}"
100 break 253 break
101 fi 254 fi
102 done 255 done
103 done 256 done
104 257
105 set +f 258 # In case we filtered out all optimization flags fallback to -O2
259 if [ "${CFLAGS/-O}" != "${CFLAGS}" -a "${NEW_CFLAGS/-O}" = "${NEW_CFLAGS}" ]; then
260 NEW_CFLAGS="${NEW_CFLAGS} -O2"
261 fi
262 if [ "${CXXFLAGS/-O}" != "${CXXFLAGS}" -a "${NEW_CXXFLAGS/-O}" = "${NEW_CXXFLAGS}" ]; then
263 NEW_CXXFLAGS="${NEW_CXXFLAGS} -O2"
264 fi
265
266 set +f # re-enable pathname expansion
106 267
107 export CFLAGS="${NEW_CFLAGS}" 268 export CFLAGS="${NEW_CFLAGS}"
108 export CXXFLAGS="${NEW_CXXFLAGS}" 269 export CXXFLAGS="${NEW_CXXFLAGS}"
270 return 0
271}
272
273test_flag() {
274 if $(tc-getCC) -S -xc "$@" -o "$(emktemp)" /dev/null &>/dev/null; then
275 printf "%s\n" "$*"
276 return 0
277 fi
278 return 1
279}
280
281test_version_info() {
282 if [[ $($(tc-getCC) --version 2>&1) == *$1* ]]; then
283 return 0
284 else
285 return 1
286 fi
287}
288
289strip-unsupported-flags() {
290 local NEW_CFLAGS NEW_CXXFLAGS
291
292 for x in ${CFLAGS} ; do
293 NEW_CFLAGS="${NEW_CFLAGS} `test_flag ${x}`"
294 done
295 for x in ${CXXFLAGS} ; do
296 NEW_CXXFLAGS="${NEW_CXXFLAGS} `test_flag ${x}`"
297 done
298
299 export CFLAGS="${NEW_CFLAGS}"
300 export CXXFLAGS="${NEW_CXXFLAGS}"
109} 301}
110 302
111get-flag() { 303get-flag() {
112 local findflag="$1" 304 local f findflag="$1"
113 305
306 # this code looks a little flaky but seems to work for
307 # everything we want ...
308 # for example, if CFLAGS="-march=i686":
309 # `get-flag -march` == "-march=i686"
310 # `get-flag march` == "i686"
114 for f in ${CFLAGS} ${CXXFLAGS} ; do 311 for f in ${CFLAGS} ${CXXFLAGS} ; do
115 if [ "${f/${findflag}}" != "${f}" ] ; then 312 if [ "${f/${findflag}}" != "${f}" ] ; then
116 echo "${f/-${findflag}=}" 313 printf "%s\n" "${f/-${findflag}=}"
117 return 314 return 0
118 fi 315 fi
119 done 316 done
317 return 1
120} 318}
319
320has_hardened() {
321 test_version_info Hardened && return 0
322 # the specs file wont exist unless gcc has GCC_SPECS support
323 [ -f "${GCC_SPECS}" -a "${GCC_SPECS}" != "${GCC_SPECS/hardened/}" ] && \
324 return 0
325 return 1
326}
327
328# indicate whether PIC is set
329has_pic() {
330 [ "${CFLAGS/-fPIC}" != "${CFLAGS}" ] && return 0
331 [ "${CFLAGS/-fpic}" != "${CFLAGS}" ] && return 0
332 [ "$(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __PIC__)" ] && return 0
333 return 1
334}
335
336# indicate whether PIE is set
337has_pie() {
338 [ "${CFLAGS/-fPIE}" != "${CFLAGS}" ] && return 0
339 [ "${CFLAGS/-fpie}" != "${CFLAGS}" ] && return 0
340 [ "$(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __PIE__)" ] && return 0
341 # test PIC while waiting for specs to be updated to generate __PIE__
342 [ "$(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __PIC__)" ] && return 0
343 return 1
344}
345
346# indicate whether code for SSP is being generated for all functions
347has_ssp_all() {
348 # note; this matches only -fstack-protector-all
349 [ "${CFLAGS/-fstack-protector-all}" != "${CFLAGS}" ] && return 0
350 [ "$(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __SSP_ALL__)" ] && return 0
351 return 1
352}
353
354# indicate whether code for SSP is being generated
355has_ssp() {
356 # note; this matches both -fstack-protector and -fstack-protector-all
357 [ "${CFLAGS/-fstack-protector}" != "${CFLAGS}" ] && return 0
358 [ "$(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __SSP__)" ] && return 0
359 return 1
360}
361
362has_m64() {
363 # this doesnt test if the flag is accepted, it tests if the flag
364 # actually -WORKS-. non-multilib gcc will take both -m32 and -m64!
365 # please dont replace this function with test_flag in some future
366 # clean-up!
367 local temp="$(emktemp)"
368 echo "int main() { return(0); }" > ${temp}.c
369 MY_CC=$(tc-getCC)
370 ${MY_CC/ .*/} -m64 -o "$(emktemp)" ${temp}.c > /dev/null 2>&1
371 local ret=$?
372 rm -f ${temp}.c
373 [ "$ret" != "1" ] && return 0
374 return 1
375}
376
377has_m32() {
378 # this doesnt test if the flag is accepted, it tests if the flag
379 # actually -WORKS-. non-multilib gcc will take both -m32 and -m64!
380 # please dont replace this function with test_flag in some future
381 # clean-up!
382
383 [ "$(tc-arch)" = "amd64" ] && has_multilib_profile && return 0
384
385 local temp="$(emktemp)"
386 echo "int main() { return(0); }" > ${temp}.c
387 MY_CC=$(tc-getCC)
388 ${MY_CC/ .*/} -m32 -o "$(emktemp)" ${temp}.c > /dev/null 2>&1
389 local ret=$?
390 rm -f ${temp}.c
391 [ "$ret" != "1" ] && return 0
392 return 1
393}
394
395replace-sparc64-flags() {
396 local SPARC64_CPUS="ultrasparc v9"
397
398 if [ "${CFLAGS/mtune}" != "${CFLAGS}" ]; then
399 for x in ${SPARC64_CPUS}; do
400 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8}"
401 done
402 else
403 for x in ${SPARC64_CPUS}; do
404 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
405 done
406 fi
407
408 if [ "${CXXFLAGS/mtune}" != "${CXXFLAGS}" ]; then
409 for x in ${SPARC64_CPUS}; do
410 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8}"
411 done
412 else
413 for x in ${SPARC64_CPUS}; do
414 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
415 done
416 fi
417
418 export CFLAGS CXXFLAGS
419}
420
421append-ldflags() {
422 export LDFLAGS="${LDFLAGS} $*"
423 return 0
424}
425
426filter-ldflags() {
427 local x
428
429 # we do this fancy spacing stuff so as to not filter
430 # out part of a flag ... we want flag atoms ! :D
431 LDFLAGS=" ${LDFLAGS} "
432 for x in "$@" ; do
433 LDFLAGS=${LDFLAGS// ${x} / }
434 done
435 [[ -z ${LDFLAGS// } ]] \
436 && LDFLAGS="" \
437 || LDFLAGS=${LDFLAGS:1:${#LDFLAGS}-2}
438 export LDFLAGS
439 return 0
440}
441
442fstack-flags() {
443 if has_ssp; then
444 [ -z "`is-flag -fno-stack-protector`" ] &&
445 export CFLAGS="${CFLAGS} `test_flag -fno-stack-protector`"
446 fi
447 return 0
448}
449
450# This is thanks to great work from Paul de Vrieze <gentoo-user@devrieze.net>,
451# bug #9016. Also thanks to Jukka Salmi <salmi@gmx.net> (bug #13907) for more
452# fixes.
453#
454# Export CFLAGS and CXXFLAGS that are compadible with gcc-2.95.3
455gcc2-flags() {
456 if [[ $(tc-arch) == "x86" || $(tc-arch) == "amd64" ]] ; then
457 CFLAGS=${CFLAGS//-mtune=/-mcpu=}
458 CXXFLAGS=${CXXFLAGS//-mtune=/-mcpu=}
459 fi
460
461 replace-cpu-flags k6-{2,3} k6
462 replace-cpu-flags athlon{,-{tbird,4,xp,mp}} i686
463
464 replace-cpu-flags pentium-mmx i586
465 replace-cpu-flags pentium{2,3,4} i686
466
467 replace-cpu-flags ev6{7,8} ev6
468
469 export CFLAGS CXXFLAGS
470}

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