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Revision 1.15 Revision 1.92
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 1.92 2005/08/01 10:50:55 kevquinn Exp $
4#
5# Author Bart Verwilst <verwilst@gentoo.org>
6 4
7ECLASS=flag-o-matic
8INHERITED="$INHERITED $ECLASS"
9 5
6# need access to emktemp()
7inherit eutils toolchain-funcs multilib
8
10# 9#
11#### filter-flags <flag> #### 10#### filter-flags <flags> ####
12# Remove particular flags from C[XX]FLAGS 11# Remove particular flags from C[XX]FLAGS
12# Matches only complete flags
13# 13#
14#### append-flags <flag> #### 14#### append-flags <flags> ####
15# Add extra flags to your current C[XX]FLAGS 15# Add extra flags to your current C[XX]FLAGS
16# 16#
17#### replace-flags <orig.flag> <new.flag> ### 17#### replace-flags <orig.flag> <new.flag> ###
18# Replace a flag by another one 18# Replace a flag by another one
19# 19#
20#### replace-cpu-flags <old.cpus> <new.cpu> ###
21# Replace march/mcpu flags that specify <old.cpus>
22# with flags that specify <new.cpu>
23#
20#### is-flag <flag> #### 24#### is-flag <flag> ####
21# Returns "true" if flag is set in C[XX]FLAGS 25# Returns "true" if flag is set in C[XX]FLAGS
22# Matches only complete flag 26# Matches only complete a flag
23# 27#
24#### strip-flags #### 28#### strip-flags ####
25# Strip C[XX]FLAGS of everything except known 29# Strip C[XX]FLAGS of everything except known
26# good options. 30# good options.
27# 31#
32#### strip-unsupported-flags ####
33# Strip C[XX]FLAGS of any flags not supported by
34# installed version of gcc
35#
28#### get-flag <flag> #### 36#### get-flag <flag> ####
29# Find and echo the value for a particular flag 37# Find and echo the value for a particular flag
30# 38#
39#### replace-sparc64-flags ####
40# Sets mcpu to v8 and uses the original value
41# as mtune if none specified.
42#
43#### filter-mfpmath <math types> ####
44# Remove specified math types from the fpmath specification
45# If the user has -mfpmath=sse,386, running `filter-mfpmath sse`
46# will leave the user with -mfpmath=386
47#
48#### append-ldflags ####
49# Add extra flags to your current LDFLAGS
50#
51#### filter-ldflags <flags> ####
52# Remove particular flags from LDFLAGS
53# Matches only complete flags
54#
55#### fstack-flags ####
56# hooked function for hardened gcc that appends
57# -fno-stack-protector to {C,CXX,LD}FLAGS
58# when a package is filtering -fstack-protector, -fstack-protector-all
59# notice: modern automatic specs files will also suppress -fstack-protector-all
60# when only -fno-stack-protector is given
61#
62#
63################ DEPRECATED functions ################
64# The following are still present to avoid breaking existing
65# code more than necessary; however they are deprecated. Please
66# use gcc-specs-* from toolchain-funcs.eclass instead, if you
67# need to know which hardened techs are active in the compiler.
68# See bug #100974
69#
70#### has_hardened ####
71# Returns true if the compiler has 'Hardened' in its version string,
72# (note; switched-spec vanilla compilers satisfy this condition) or
73# the specs file name contains 'hardened'.
74#
75#### has_pie ####
76# Returns true if the compiler by default or with current CFLAGS
77# builds position-independent code.
78#
79#### has_pic ####
80# Returns true if the compiler by default or with current CFLAGS
81# builds position-independent code.
82#
83#### has_ssp_all ####
84# Returns true if the compiler by default or with current CFLAGS
85# generates stack smash protections for all functions
86#
87#### has_ssp ####
88# Returns true if the compiler by default or with current CFLAGS
89# generates stack smash protections for most vulnerable functions
90#
31 91
32ALLOWED_FLAGS="-O -mcpu -march -mtune -fstack-protector -pipe -g" 92# C[XX]FLAGS that we allow in strip-flags
93setup-allowed-flags() {
94 if [[ -z ${ALLOWED_FLAGS} ]] ; then
95 export ALLOWED_FLAGS="-pipe"
96 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -O -O0 -O1 -O2 -mcpu -march -mtune"
97 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -fstack-protector -fstack-protector-all"
98 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -fbounds-checking -fno-bounds-checking"
99 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -fno-pie -fno-unit-at-a-time"
100 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -g -g0 -g1 -g2 -g3 -ggdb -ggdb0 -ggdb1 -ggdb2 -ggdb3"
101 fi
102 # allow a bunch of flags that negate features / control ABI
103 ALLOWED_FLAGS="${ALLOWED_FLAGS} -fno-stack-protector -fno-stack-protector-all"
104 ALLOWED_FLAGS="${ALLOWED_FLAGS} -mregparm -mno-app-regs -mapp-regs \
105 -mno-mmx -mno-sse -mno-sse2 -mno-sse3 -mno-3dnow \
106 -mips1 -mips2 -mips3 -mips4 -mips32 -mips64 -mips16 \
107 -msoft-float -mno-soft-float -mhard-float -mno-hard-float -mfpu \
108 -mieee -mieee-with-inexact \
109 -mtls-direct-seg-refs -mno-tls-direct-seg-refs \
110 -mflat -mno-flat -mno-faster-structs -mfaster-structs \
111 -m32 -m64 -mabi -mlittle-endian -mbig-endian -EL -EB -fPIC \
112 -mlive-g0 -mcmodel -mstack-bias -mno-stack-bias"
33 113
114 # C[XX]FLAGS that we are think is ok, but needs testing
115 # NOTE: currently -Os have issues with gcc3 and K6* arch's
116 export UNSTABLE_FLAGS="-Os -O3 -freorder-blocks -fprefetch-loop-arrays"
117 return 0
118}
34 119
35filter-flags () { 120filter-flags() {
121 local x f fset
122 declare -a new_CFLAGS new_CXXFLAGS
36 123
37 for x in $1 124 for x in "$@" ; do
125 case "${x}" in
126 -fPIC|-fpic|-fPIE|-fpie|-pie)
127 append-flags `test_flag -fno-pie`;;
128 -fstack-protector|-fstack-protector-all)
129 fstack-flags;;
130 esac
38 do 131 done
39 export CFLAGS="${CFLAGS/${x}}" 132
40 export CXXFLAGS="${CXXFLAGS/${x}}" 133 for fset in CFLAGS CXXFLAGS; do
134 # Looping over the flags instead of using a global
135 # substitution ensures that we're working with flag atoms.
136 # Otherwise globs like -O* have the potential to wipe out the
137 # list of flags.
138 for f in ${!fset}; do
139 for x in "$@"; do
140 # Note this should work with globs like -O*
141 [[ ${f} == ${x} ]] && continue 2
142 done
143 eval new_${fset}\[\${\#new_${fset}\[@]}]=\${f}
41 done 144 done
145 eval export ${fset}=\${new_${fset}\[*]}
146 done
42 147
148 return 0
43} 149}
44 150
151filter-lfs-flags() {
152 filter-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
153}
154
155append-lfs-flags() {
156 append-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
157}
158
45append-flags () { 159append-flags() {
46 160 [[ -z $* ]] && return 0
47 CFLAGS="${CFLAGS} $1" 161 export CFLAGS="${CFLAGS} $*"
48 CXXFLAGS="${CXXFLAGS} $1" 162 export CXXFLAGS="${CXXFLAGS} $*"
49 163 [ -n "`is-flag -fno-stack-protector`" -o \
164 -n "`is-flag -fno-stack-protector-all`" ] && fstack-flags
165 return 0
50} 166}
51 167
52replace-flags () { 168replace-flags() {
169 local f fset
170 declare -a new_CFLAGS new_CXXFLAGS
53 171
54 CFLAGS="${CFLAGS/${1}/${2} }" 172 for fset in CFLAGS CXXFLAGS; do
55 CXXFLAGS="${CXXFLAGS/${1}/${2} }" 173 # Looping over the flags instead of using a global
174 # substitution ensures that we're working with flag atoms.
175 # Otherwise globs like -O* have the potential to wipe out the
176 # list of flags.
177 for f in ${!fset}; do
178 # Note this should work with globs like -O*
179 [[ ${f} == ${1} ]] && f=${2}
180 eval new_${fset}\[\${\#new_${fset}\[@]}]=\${f}
181 done
182 eval export ${fset}=\${new_${fset}\[*]}
183 done
56 184
185 return 0
186}
187
188replace-cpu-flags() {
189 local newcpu="$#" ; newcpu="${!newcpu}"
190 while [ $# -gt 1 ] ; do
191 # quote to make sure that no globbing is done (particularly on
192 # ${oldcpu} prior to calling replace-flags
193 replace-flags "-march=${1}" "-march=${newcpu}"
194 replace-flags "-mcpu=${1}" "-mcpu=${newcpu}"
195 replace-flags "-mtune=${1}" "-mtune=${newcpu}"
196 shift
197 done
198 return 0
57} 199}
58 200
59is-flag() { 201is-flag() {
202 local x
60 203
61 for x in ${CFLAGS} ${CXXFLAGS} 204 for x in ${CFLAGS} ${CXXFLAGS} ; do
62 do 205 # Note this should work with globs like -mcpu=ultrasparc*
63 if [ "${x}" = "$1" ] 206 if [[ ${x} == ${1} ]]; then
64 then
65 echo true 207 echo true
66 break 208 return 0
67 fi 209 fi
68 done 210 done
211 return 1
212}
69 213
214filter-mfpmath() {
215 local orig_mfpmath new_math prune_math
216
217 # save the original -mfpmath flag
218 orig_mfpmath="`get-flag -mfpmath`"
219 # get the value of the current -mfpmath flag
220 new_math=" `get-flag mfpmath | tr , ' '` "
221 # figure out which math values are to be removed
222 prune_math=""
223 for prune_math in "$@" ; do
224 new_math="${new_math/ ${prune_math} / }"
225 done
226 new_math="`echo ${new_math:1:${#new_math}-2} | tr ' ' ,`"
227
228 if [ -z "${new_math}" ] ; then
229 # if we're removing all user specified math values are
230 # slated for removal, then we just filter the flag
231 filter-flags ${orig_mfpmath}
232 else
233 # if we only want to filter some of the user specified
234 # math values, then we replace the current flag
235 replace-flags ${orig_mfpmath} -mfpmath=${new_math}
236 fi
237 return 0
70} 238}
71 239
72strip-flags() { 240strip-flags() {
241 local x y flag NEW_CFLAGS NEW_CXXFLAGS
242
243 setup-allowed-flags
73 244
74 local NEW_CFLAGS="" 245 local NEW_CFLAGS=""
75 local NEW_CXXFLAGS="" 246 local NEW_CXXFLAGS=""
76 247
77 set -f 248 # Allow unstable C[XX]FLAGS if we are using unstable profile ...
249 if has ~$(tc-arch) ${ACCEPT_KEYWORDS} ; then
250 ALLOWED_FLAGS="${ALLOWED_FLAGS} ${UNSTABLE_FLAGS}"
251 fi
78 252
253 set -f # disable pathname expansion
254
79 for x in ${CFLAGS} 255 for x in ${CFLAGS}; do
80 do
81 for y in ${ALLOWED_FLAGS} 256 for y in ${ALLOWED_FLAGS}; do
82 do
83 flag=${x%%=*} 257 flag=${x%%=*}
84 if [ "${flag%%${y}}" = "" ] 258 if [ "${flag%%${y}}" = "" ] ; then
85 then
86 NEW_CFLAGS="${NEW_CFLAGS} ${x}" 259 NEW_CFLAGS="${NEW_CFLAGS} ${x}"
87 break 260 break
88 fi 261 fi
89 done 262 done
90 done 263 done
91 264
92 for x in ${CXXFLAGS} 265 for x in ${CXXFLAGS}; do
93 do
94 for y in ${ALLOWED_FLAGS} 266 for y in ${ALLOWED_FLAGS}; do
95 do
96 flag=${x%%=*} 267 flag=${x%%=*}
97 if [ "${flag%%${y}}" = "" ] 268 if [ "${flag%%${y}}" = "" ] ; then
98 then
99 NEW_CXXFLAGS="${NEW_CXXFLAGS} ${x}" 269 NEW_CXXFLAGS="${NEW_CXXFLAGS} ${x}"
100 break 270 break
101 fi 271 fi
102 done 272 done
103 done 273 done
104 274
105 set +f 275 # In case we filtered out all optimization flags fallback to -O2
276 if [ "${CFLAGS/-O}" != "${CFLAGS}" -a "${NEW_CFLAGS/-O}" = "${NEW_CFLAGS}" ]; then
277 NEW_CFLAGS="${NEW_CFLAGS} -O2"
278 fi
279 if [ "${CXXFLAGS/-O}" != "${CXXFLAGS}" -a "${NEW_CXXFLAGS/-O}" = "${NEW_CXXFLAGS}" ]; then
280 NEW_CXXFLAGS="${NEW_CXXFLAGS} -O2"
281 fi
282
283 set +f # re-enable pathname expansion
106 284
107 export CFLAGS="${NEW_CFLAGS}" 285 export CFLAGS="${NEW_CFLAGS}"
108 export CXXFLAGS="${NEW_CXXFLAGS}" 286 export CXXFLAGS="${NEW_CXXFLAGS}"
287 return 0
288}
289
290test_flag() {
291 if $(tc-getCC) -S -xc "$@" -o "$(emktemp)" /dev/null &>/dev/null; then
292 printf "%s\n" "$*"
293 return 0
294 fi
295 return 1
296}
297
298test_version_info() {
299 if [[ $($(tc-getCC) --version 2>&1) == *$1* ]]; then
300 return 0
301 else
302 return 1
303 fi
304}
305
306strip-unsupported-flags() {
307 local NEW_CFLAGS NEW_CXXFLAGS
308
309 for x in ${CFLAGS} ; do
310 NEW_CFLAGS="${NEW_CFLAGS} `test_flag ${x}`"
311 done
312 for x in ${CXXFLAGS} ; do
313 NEW_CXXFLAGS="${NEW_CXXFLAGS} `test_flag ${x}`"
314 done
315
316 export CFLAGS="${NEW_CFLAGS}"
317 export CXXFLAGS="${NEW_CXXFLAGS}"
109} 318}
110 319
111get-flag() { 320get-flag() {
112 local findflag="$1" 321 local f findflag="$1"
113 322
323 # this code looks a little flaky but seems to work for
324 # everything we want ...
325 # for example, if CFLAGS="-march=i686":
326 # `get-flag -march` == "-march=i686"
327 # `get-flag march` == "i686"
114 for f in ${CFLAGS} ${CXXFLAGS} ; do 328 for f in ${CFLAGS} ${CXXFLAGS} ; do
115 if [ "${f/${findflag}}" != "${f}" ] ; then 329 if [ "${f/${findflag}}" != "${f}" ] ; then
116 echo "${f/-${findflag}=}" 330 printf "%s\n" "${f/-${findflag}=}"
117 return 331 return 0
118 fi 332 fi
119 done 333 done
334 return 1
120} 335}
336
337# DEPRECATED - use gcc-specs-relro or gcc-specs-now from toolchain-funcs
338has_hardened() {
339 test_version_info Hardened && return 0
340 # the specs file wont exist unless gcc has GCC_SPECS support
341 [ -f "${GCC_SPECS}" -a "${GCC_SPECS}" != "${GCC_SPECS/hardened/}" ] && \
342 return 0
343 return 1
344}
345
346# DEPRECATED - use gcc-specs-pie from toolchain-funcs
347# indicate whether PIC is set
348has_pic() {
349 [ "${CFLAGS/-fPIC}" != "${CFLAGS}" ] && return 0
350 [ "${CFLAGS/-fpic}" != "${CFLAGS}" ] && return 0
351 [ "$(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __PIC__)" ] && return 0
352 return 1
353}
354
355# DEPRECATED - use gcc-specs-pie from toolchain-funcs
356# indicate whether PIE is set
357has_pie() {
358 [ "${CFLAGS/-fPIE}" != "${CFLAGS}" ] && return 0
359 [ "${CFLAGS/-fpie}" != "${CFLAGS}" ] && return 0
360 [ "$(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __PIE__)" ] && return 0
361 # test PIC while waiting for specs to be updated to generate __PIE__
362 [ "$(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __PIC__)" ] && return 0
363 return 1
364}
365
366# DEPRECATED - use gcc-specs-ssp from toolchain-funcs
367# indicate whether code for SSP is being generated for all functions
368has_ssp_all() {
369 # note; this matches only -fstack-protector-all
370 [ "${CFLAGS/-fstack-protector-all}" != "${CFLAGS}" ] && return 0
371 [ "$(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __SSP_ALL__)" ] && return 0
372 gcc-specs-ssp && return 0
373 return 1
374}
375
376# DEPRECATED - use gcc-specs-ssp from toolchain-funcs
377# indicate whether code for SSP is being generated
378has_ssp() {
379 # note; this matches both -fstack-protector and -fstack-protector-all
380 [ "${CFLAGS/-fstack-protector}" != "${CFLAGS}" ] && return 0
381 [ "$(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __SSP__)" ] && return 0
382 gcc-specs-ssp && return 0
383 return 1
384}
385
386has_m64() {
387 # this doesnt test if the flag is accepted, it tests if the flag
388 # actually -WORKS-. non-multilib gcc will take both -m32 and -m64!
389 # please dont replace this function with test_flag in some future
390 # clean-up!
391 local temp="$(emktemp)"
392 echo "int main() { return(0); }" > ${temp}.c
393 MY_CC=$(tc-getCC)
394 ${MY_CC/ .*/} -m64 -o "$(emktemp)" ${temp}.c > /dev/null 2>&1
395 local ret=$?
396 rm -f ${temp}.c
397 [ "$ret" != "1" ] && return 0
398 return 1
399}
400
401has_m32() {
402 # this doesnt test if the flag is accepted, it tests if the flag
403 # actually -WORKS-. non-multilib gcc will take both -m32 and -m64!
404 # please dont replace this function with test_flag in some future
405 # clean-up!
406
407 [ "$(tc-arch)" = "amd64" ] && has_multilib_profile && return 0
408
409 local temp="$(emktemp)"
410 echo "int main() { return(0); }" > ${temp}.c
411 MY_CC=$(tc-getCC)
412 ${MY_CC/ .*/} -m32 -o "$(emktemp)" ${temp}.c > /dev/null 2>&1
413 local ret=$?
414 rm -f ${temp}.c
415 [ "$ret" != "1" ] && return 0
416 return 1
417}
418
419replace-sparc64-flags() {
420 local SPARC64_CPUS="ultrasparc v9"
421
422 if [ "${CFLAGS/mtune}" != "${CFLAGS}" ]; then
423 for x in ${SPARC64_CPUS}; do
424 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8}"
425 done
426 else
427 for x in ${SPARC64_CPUS}; do
428 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
429 done
430 fi
431
432 if [ "${CXXFLAGS/mtune}" != "${CXXFLAGS}" ]; then
433 for x in ${SPARC64_CPUS}; do
434 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8}"
435 done
436 else
437 for x in ${SPARC64_CPUS}; do
438 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
439 done
440 fi
441
442 export CFLAGS CXXFLAGS
443}
444
445append-ldflags() {
446 export LDFLAGS="${LDFLAGS} $*"
447 return 0
448}
449
450filter-ldflags() {
451 local x
452
453 # we do this fancy spacing stuff so as to not filter
454 # out part of a flag ... we want flag atoms ! :D
455 LDFLAGS=" ${LDFLAGS} "
456 for x in "$@" ; do
457 LDFLAGS=${LDFLAGS// ${x} / }
458 done
459 [[ -z ${LDFLAGS// } ]] \
460 && LDFLAGS="" \
461 || LDFLAGS=${LDFLAGS:1:${#LDFLAGS}-2}
462 export LDFLAGS
463 return 0
464}
465
466fstack-flags() {
467 if gcc-specs-ssp; then
468 [ -z "`is-flag -fno-stack-protector`" ] &&
469 export CFLAGS="${CFLAGS} `test_flag -fno-stack-protector`"
470 fi
471 return 0
472}
473
474# This is thanks to great work from Paul de Vrieze <gentoo-user@devrieze.net>,
475# bug #9016. Also thanks to Jukka Salmi <salmi@gmx.net> (bug #13907) for more
476# fixes.
477#
478# Export CFLAGS and CXXFLAGS that are compadible with gcc-2.95.3
479gcc2-flags() {
480 if [[ $(tc-arch) == "x86" || $(tc-arch) == "amd64" ]] ; then
481 CFLAGS=${CFLAGS//-mtune=/-mcpu=}
482 CXXFLAGS=${CXXFLAGS//-mtune=/-mcpu=}
483 fi
484
485 replace-cpu-flags k6-{2,3} k6
486 replace-cpu-flags athlon{,-{tbird,4,xp,mp}} i686
487
488 replace-cpu-flags pentium-mmx i586
489 replace-cpu-flags pentium{2,3,4} i686
490
491 replace-cpu-flags ev6{7,8} ev6
492
493 export CFLAGS CXXFLAGS
494}

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