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1# Copyright 1999-2002 Gentoo Technologies, Inc. 1# Copyright 1999-2012 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# Author Bart Verwilst <verwilst@gentoo.org> 3# $Header: /var/cvsroot/gentoo-x86/eclass/flag-o-matic.eclass,v 1.174 2012/06/05 02:07:44 dirtyepic Exp $
4# /space/gentoo/cvsroot/gentoo-x86/eclass/flag-o-matic.eclass
5ECLASS=flag-o-matic
6 4
5# @ECLASS: flag-o-matic.eclass
6# @MAINTAINER:
7# toolchain@gentoo.org
8# @BLURB: common functions to manipulate and query toolchain flags
9# @DESCRIPTION:
10# This eclass contains a suite of functions to help developers sanely
11# and safely manage toolchain flags in their builds.
12
13if [[ ${___ECLASS_ONCE_FLAG_O_MATIC} != "recur -_+^+_- spank" ]] ; then
14___ECLASS_ONCE_FLAG_O_MATIC="recur -_+^+_- spank"
15
16inherit eutils toolchain-funcs multilib
17
18# Return all the flag variables that our high level funcs operate on.
19all-flag-vars() {
20 echo {C,CPP,CXX,CCAS,F,FC,LD}FLAGS
21}
22
23# {C,CXX,F,FC}FLAGS that we allow in strip-flags
24# Note: shell globs and character lists are allowed
25setup-allowed-flags() {
26 ALLOWED_FLAGS="-pipe"
27 ALLOWED_FLAGS+=" -O -O1 -O2 -Os -mcpu -march -mtune"
28 ALLOWED_FLAGS+=" -fstack-protector -fstack-protector-all"
29 ALLOWED_FLAGS+=" -fbounds-checking -fno-strict-overflow"
30 ALLOWED_FLAGS+=" -fno-PIE -fno-pie -fno-unit-at-a-time"
31 ALLOWED_FLAGS+=" -g -g[0-9] -ggdb -ggdb[0-9] -gstabs -gstabs+"
32 ALLOWED_FLAGS+=" -fno-ident -fpermissive"
33 ALLOWED_FLAGS+=" -W* -w"
34
35 # allow a bunch of flags that negate features / control ABI
36 ALLOWED_FLAGS+=" -fno-stack-protector -fno-stack-protector-all \
37 -fno-strict-aliasing -fno-bounds-checking -fstrict-overflow \
38 -fno-omit-frame-pointer"
39 ALLOWED_FLAGS+=" -mregparm -mno-app-regs -mapp-regs -mno-mmx -mno-sse \
40 -mno-sse2 -mno-sse3 -mno-ssse3 -mno-sse4 -mno-sse4.1 -mno-sse4.2 \
41 -mno-avx -mno-aes -mno-pclmul -mno-sse4a -mno-3dnow -mno-popcnt \
42 -mno-abm -mips1 -mips2 -mips3 -mips4 -mips32 -mips64 -mips16 -mplt \
43 -msoft-float -mno-soft-float -mhard-float -mno-hard-float -mfpu \
44 -mieee -mieee-with-inexact -mschedule -mfloat-gprs -mspe -mno-spe \
45 -mtls-direct-seg-refs -mno-tls-direct-seg-refs -mflat -mno-flat \
46 -mno-faster-structs -mfaster-structs -m32 -m64 -mx32 -mabi \
47 -mlittle-endian -mbig-endian -EL -EB -fPIC -mlive-g0 -mcmodel \
48 -mstack-bias -mno-stack-bias -msecure-plt -m*-toc -mfloat-abi=* \
49 -D* -U*"
50
51 # 4.5
52 ALLOWED_FLAGS+=" -mno-fma4 -mno-movbe -mno-xop -mno-lwp"
53 # 4.6
54 ALLOWED_FLAGS+=" -mno-fsgsbase -mno-rdrnd -mno-f16c -mno-bmi -mno-tbm"
55
56 export ALLOWED_FLAGS
57 return 0
58}
59
60# inverted filters for hardened compiler. This is trying to unpick
61# the hardened compiler defaults.
62_filter-hardened() {
63 local f
64 for f in "$@" ; do
65 case "${f}" in
66 # Ideally we should only concern ourselves with PIE flags,
67 # not -fPIC or -fpic, but too many places filter -fPIC without
68 # thinking about -fPIE.
69 -fPIC|-fpic|-fPIE|-fpie|-Wl,pie|-pie)
70 gcc-specs-pie || continue
71 is-flagq -nopie || append-flags -nopie;;
72 -fstack-protector)
73 gcc-specs-ssp || continue
74 is-flagq -fno-stack-protector || append-flags $(test-flags -fno-stack-protector);;
75 -fstack-protector-all)
76 gcc-specs-ssp-to-all || continue
77 is-flagq -fno-stack-protector-all || append-flags $(test-flags -fno-stack-protector-all);;
78 -fno-strict-overflow)
79 gcc-specs-nostrict || continue
80 is-flagq -fstrict-overflow || append-flags $(test-flags -fstrict-overflow);;
81 esac
82 done
83}
84
85# Remove occurrences of strings from variable given in $1
86# Strings removed are matched as globs, so for example
87# '-O*' would remove -O1, -O2 etc.
88_filter-var() {
89 local f x var=$1 new=()
90 shift
91
92 for f in ${!var} ; do
93 for x in "$@" ; do
94 # Note this should work with globs like -O*
95 [[ ${f} == ${x} ]] && continue 2
96 done
97 new+=( "${f}" )
98 done
99 eval export ${var}=\""${new[*]}"\"
100}
101
102# @FUNCTION: filter-flags
103# @USAGE: <flags>
104# @DESCRIPTION:
105# Remove particular <flags> from {C,CPP,CXX,CCAS,F,FC,LD}FLAGS. Accepts shell globs.
106filter-flags() {
107 _filter-hardened "$@"
108 local v
109 for v in $(all-flag-vars) ; do
110 _filter-var ${v} "$@"
111 done
112 return 0
113}
114
115# @FUNCTION: filter-lfs-flags
116# @DESCRIPTION:
117# Remove flags that enable Large File Support.
118filter-lfs-flags() {
119 [[ $# -ne 0 ]] && die "filter-lfs-flags takes no arguments"
120 # http://www.gnu.org/s/libc/manual/html_node/Feature-Test-Macros.html
121 # _LARGEFILE_SOURCE: enable support for new LFS funcs (ftello/etc...)
122 # _LARGEFILE64_SOURCE: enable support for 64bit variants (off64_t/fseeko64/etc...)
123 # _FILE_OFFSET_BITS: default to 64bit variants (off_t is defined as off64_t)
124 filter-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
125}
126
127# @FUNCTION: filter-ldflags
128# @USAGE: <flags>
129# @DESCRIPTION:
130# Remove particular <flags> from LDFLAGS. Accepts shell globs.
131filter-ldflags() {
132 _filter-var LDFLAGS "$@"
133 return 0
134}
135
136# @FUNCTION: append-cppflags
137# @USAGE: <flags>
138# @DESCRIPTION:
139# Add extra <flags> to the current CPPFLAGS.
140append-cppflags() {
141 [[ $# -eq 0 ]] && return 0
142 export CPPFLAGS="${CPPFLAGS} $*"
143 return 0
144}
145
146# @FUNCTION: append-cflags
147# @USAGE: <flags>
148# @DESCRIPTION:
149# Add extra <flags> to the current CFLAGS.
150append-cflags() {
151 [[ $# -eq 0 ]] && return 0
152 export CFLAGS=$(test-flags-CC ${CFLAGS} "$@")
153 return 0
154}
155
156# @FUNCTION: append-cxxflags
157# @USAGE: <flags>
158# @DESCRIPTION:
159# Add extra <flags> to the current CXXFLAGS.
160append-cxxflags() {
161 [[ $# -eq 0 ]] && return 0
162 export CXXFLAGS=$(test-flags-CXX ${CXXFLAGS} "$@")
163 return 0
164}
165
166# @FUNCTION: append-fflags
167# @USAGE: <flags>
168# @DESCRIPTION:
169# Add extra <flags> to the current {F,FC}FLAGS.
170append-fflags() {
171 [[ $# -eq 0 ]] && return 0
172 export FFLAGS=$(test-flags-F77 ${FFLAGS} "$@")
173 export FCFLAGS=$(test-flags-FC ${FCFLAGS} "$@")
174 return 0
175}
176
177# @FUNCTION: append-lfs-flags
178# @DESCRIPTION:
179# Add flags that enable Large File Support.
180append-lfs-flags() {
181 [[ $# -ne 0 ]] && die "append-lfs-flags takes no arguments"
182 # see comments in filter-lfs-flags func for meaning of these
183 append-cppflags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
184}
185
186# @FUNCTION: append-ldflags
187# @USAGE: <flags>
188# @DESCRIPTION:
189# Add extra <flags> to the current LDFLAGS.
190append-ldflags() {
191 [[ $# -eq 0 ]] && return 0
192 local flag
193 for flag in "$@"; do
194 [[ ${flag} == -l* ]] && \
195 ewarn "Appending a library link instruction (${flag}); libraries to link to should not be passed through LDFLAGS"
196 done
197
198 export LDFLAGS="${LDFLAGS} $*"
199 return 0
200}
201
202# @FUNCTION: append-flags
203# @USAGE: <flags>
204# @DESCRIPTION:
205# Add extra <flags> to your current {C,CXX,F,FC}FLAGS.
206append-flags() {
207 [[ $# -eq 0 ]] && return 0
208 case " $* " in
209 *' '-[DIU]*) eqawarn 'please use append-cppflags for preprocessor flags' ;;
210 *' '-L*|\
211 *' '-Wl,*) eqawarn 'please use append-ldflags for linker flags' ;;
212 esac
213 append-cflags "$@"
214 append-cxxflags "$@"
215 append-fflags "$@"
216 return 0
217}
218
219# @FUNCTION: replace-flags
220# @USAGE: <old> <new>
221# @DESCRIPTION:
222# Replace the <old> flag with <new>. Accepts shell globs for <old>.
223replace-flags() {
224 [[ $# != 2 ]] && die "Usage: replace-flags <old flag> <new flag>"
225
226 local f var new
227 for var in $(all-flag-vars) ; do
228 # Looping over the flags instead of using a global
229 # substitution ensures that we're working with flag atoms.
230 # Otherwise globs like -O* have the potential to wipe out the
231 # list of flags.
232 new=()
233 for f in ${!var} ; do
234 # Note this should work with globs like -O*
235 [[ ${f} == ${1} ]] && f=${2}
236 new+=( "${f}" )
237 done
238 eval export ${var}=\""${new[*]}"\"
239 done
240
241 return 0
242}
243
244# @FUNCTION: replace-cpu-flags
245# @USAGE: <old> <new>
246# @DESCRIPTION:
247# Replace cpu flags (like -march/-mcpu/-mtune) that select the <old> cpu
248# with flags that select the <new> cpu. Accepts shell globs for <old>.
249replace-cpu-flags() {
250 local newcpu="$#" ; newcpu="${!newcpu}"
251 while [ $# -gt 1 ] ; do
252 # quote to make sure that no globbing is done (particularly on
253 # ${oldcpu}) prior to calling replace-flags
254 replace-flags "-march=${1}" "-march=${newcpu}"
255 replace-flags "-mcpu=${1}" "-mcpu=${newcpu}"
256 replace-flags "-mtune=${1}" "-mtune=${newcpu}"
257 shift
258 done
259 return 0
260}
261
262_is_flagq() {
263 local x
264 for x in ${!1} ; do
265 [[ ${x} == $2 ]] && return 0
266 done
267 return 1
268}
269
270# @FUNCTION: is-flagq
271# @USAGE: <flag>
272# @DESCRIPTION:
273# Returns shell true if <flag> is in {C,CXX,F,FC}FLAGS, else returns shell false. Accepts shell globs.
274is-flagq() {
275 [[ -n $2 ]] && die "Usage: is-flag <flag>"
276
277 local var
278 for var in $(all-flag-vars) ; do
279 _is_flagq ${var} "$1" && return 0
280 done
281 return 1
282}
283
284# @FUNCTION: is-flag
285# @USAGE: <flag>
286# @DESCRIPTION:
287# Echo's "true" if flag is set in {C,CXX,F,FC}FLAGS. Accepts shell globs.
288is-flag() {
289 is-flagq "$@" && echo true
290}
291
292# @FUNCTION: is-ldflagq
293# @USAGE: <flag>
294# @DESCRIPTION:
295# Returns shell true if <flag> is in LDFLAGS, else returns shell false. Accepts shell globs.
296is-ldflagq() {
297 [[ -n $2 ]] && die "Usage: is-ldflag <flag>"
298 _is_flagq LDFLAGS $1
299}
300
301# @FUNCTION: is-ldflag
302# @USAGE: <flag>
303# @DESCRIPTION:
304# Echo's "true" if flag is set in LDFLAGS. Accepts shell globs.
305is-ldflag() {
306 is-ldflagq "$@" && echo true
307}
308
309# @FUNCTION: filter-mfpmath
310# @USAGE: <math types>
311# @DESCRIPTION:
312# Remove specified math types from the fpmath flag. For example, if the user
313# has -mfpmath=sse,386, running `filter-mfpmath sse` will leave the user with
314# -mfpmath=386.
315filter-mfpmath() {
316 local orig_mfpmath new_math prune_math
317
318 # save the original -mfpmath flag
319 orig_mfpmath=$(get-flag -mfpmath)
320 # get the value of the current -mfpmath flag
321 new_math=$(get-flag mfpmath)
322 new_math=" ${new_math//,/ } "
323 # figure out which math values are to be removed
324 prune_math=""
325 for prune_math in "$@" ; do
326 new_math=${new_math/ ${prune_math} / }
327 done
328 new_math=$(echo ${new_math})
329 new_math=${new_math// /,}
330
331 if [[ -z ${new_math} ]] ; then
332 # if we're removing all user specified math values are
333 # slated for removal, then we just filter the flag
334 filter-flags ${orig_mfpmath}
335 else
336 # if we only want to filter some of the user specified
337 # math values, then we replace the current flag
338 replace-flags ${orig_mfpmath} -mfpmath=${new_math}
339 fi
340 return 0
341}
342
343# @FUNCTION: strip-flags
344# @DESCRIPTION:
345# Strip C[XX]FLAGS of everything except known good/safe flags.
346strip-flags() {
347 local x y var
348
349 setup-allowed-flags
350
351 set -f # disable pathname expansion
352
353 for var in $(all-flag-vars) ; do
354 local new=()
355
356 for x in ${!var} ; do
357 local flag=${x%%=*}
358 for y in ${ALLOWED_FLAGS} ; do
359 if [[ -z ${flag%%${y}} ]] ; then
360 new+=( "${x}" )
361 break
362 fi
363 done
364 done
365
366 # In case we filtered out all optimization flags fallback to -O2
367 if _is_flagq ${var} "-O*" && ! _is_flagq new "-O*" ; then
368 new+=( -O2 )
369 fi
370
371 eval export ${var}=\""${new[*]}"\"
372 done
373
374 set +f # re-enable pathname expansion
375
376 return 0
377}
378
379test-flag-PROG() {
380 local comp=$1
381 local flag=$2
382
383 [[ -z ${comp} || -z ${flag} ]] && return 1
384
385 # use -c so we can test the assembler as well
386 local PROG=$(tc-get${comp})
387 ${PROG} "${flag}" -c -o /dev/null -xc /dev/null \
388 > /dev/null 2>&1
389}
390
391# @FUNCTION: test-flag-CC
392# @USAGE: <flag>
393# @DESCRIPTION:
394# Returns shell true if <flag> is supported by the C compiler, else returns shell false.
395test-flag-CC() { test-flag-PROG "CC" "$1"; }
396
397# @FUNCTION: test-flag-CXX
398# @USAGE: <flag>
399# @DESCRIPTION:
400# Returns shell true if <flag> is supported by the C++ compiler, else returns shell false.
401test-flag-CXX() { test-flag-PROG "CXX" "$1"; }
402
403# @FUNCTION: test-flag-F77
404# @USAGE: <flag>
405# @DESCRIPTION:
406# Returns shell true if <flag> is supported by the Fortran 77 compiler, else returns shell false.
407test-flag-F77() { test-flag-PROG "F77" "$1"; }
408
409# @FUNCTION: test-flag-FC
410# @USAGE: <flag>
411# @DESCRIPTION:
412# Returns shell true if <flag> is supported by the Fortran 90 compiler, else returns shell false.
413test-flag-FC() { test-flag-PROG "FC" "$1"; }
414
415test-flags-PROG() {
416 local comp=$1
417 local flags
418 local x
419
420 shift
421
422 [[ -z ${comp} ]] && return 1
423
424 for x in "$@" ; do
425 test-flag-${comp} "${x}" && flags="${flags}${flags:+ }${x}"
426 done
427
428 echo "${flags}"
429
430 # Just bail if we dont have any flags
431 [[ -n ${flags} ]]
432}
433
434# @FUNCTION: test-flags-CC
435# @USAGE: <flags>
436# @DESCRIPTION:
437# Returns shell true if <flags> are supported by the C compiler, else returns shell false.
438test-flags-CC() { test-flags-PROG "CC" "$@"; }
439
440# @FUNCTION: test-flags-CXX
441# @USAGE: <flags>
442# @DESCRIPTION:
443# Returns shell true if <flags> are supported by the C++ compiler, else returns shell false.
444test-flags-CXX() { test-flags-PROG "CXX" "$@"; }
445
446# @FUNCTION: test-flags-F77
447# @USAGE: <flags>
448# @DESCRIPTION:
449# Returns shell true if <flags> are supported by the Fortran 77 compiler, else returns shell false.
450test-flags-F77() { test-flags-PROG "F77" "$@"; }
451
452# @FUNCTION: test-flags-FC
453# @USAGE: <flags>
454# @DESCRIPTION:
455# Returns shell true if <flags> are supported by the Fortran 90 compiler, else returns shell false.
456test-flags-FC() { test-flags-PROG "FC" "$@"; }
457
458# @FUNCTION: test-flags
459# @USAGE: <flags>
460# @DESCRIPTION:
461# Short-hand that should hopefully work for both C and C++ compiler, but
462# its really only present due to the append-flags() abomination.
463test-flags() { test-flags-CC "$@"; }
464
465# @FUNCTION: test_version_info
466# @USAGE: <version>
467# @DESCRIPTION:
468# Returns shell true if the current C compiler version matches <version>, else returns shell false.
469# Accepts shell globs.
470test_version_info() {
471 if [[ $($(tc-getCC) --version 2>&1) == *$1* ]]; then
472 return 0
473 else
474 return 1
475 fi
476}
477
478# @FUNCTION: strip-unsupported-flags
479# @DESCRIPTION:
480# Strip {C,CXX,F,FC}FLAGS of any flags not supported by the active toolchain.
481strip-unsupported-flags() {
482 export CFLAGS=$(test-flags-CC ${CFLAGS})
483 export CXXFLAGS=$(test-flags-CXX ${CXXFLAGS})
484 export FFLAGS=$(test-flags-F77 ${FFLAGS})
485 export FCFLAGS=$(test-flags-FC ${FCFLAGS})
486}
487
488# @FUNCTION: get-flag
489# @USAGE: <flag>
490# @DESCRIPTION:
491# Find and echo the value for a particular flag. Accepts shell globs.
492get-flag() {
493 local f var findflag="$1"
494
495 # this code looks a little flaky but seems to work for
496 # everything we want ...
497 # for example, if CFLAGS="-march=i686":
498 # `get-flag -march` == "-march=i686"
499 # `get-flag march` == "i686"
500 for var in $(all-flag-vars) ; do
501 for f in ${!var} ; do
502 if [ "${f/${findflag}}" != "${f}" ] ; then
503 printf "%s\n" "${f/-${findflag}=}"
504 return 0
505 fi
506 done
507 done
508 return 1
509}
510
511# @FUNCTION: has_m64
512# @DESCRIPTION:
513# This doesn't test if the flag is accepted, it tests if the flag actually
514# WORKS. Non-multilib gcc will take both -m32 and -m64. If the flag works
515# return code is 0, else the return code is 1.
516has_m64() {
517 eqawarn "${FUNCNAME}: don't use this anymore"
518
519 # this doesnt test if the flag is accepted, it tests if the flag
520 # actually -WORKS-. non-multilib gcc will take both -m32 and -m64!
521 # please dont replace this function with test_flag in some future
522 # clean-up!
523
524 local temp="$(emktemp)"
525 echo "int main() { return(0); }" > "${temp}".c
526 MY_CC=$(tc-getCC)
527 ${MY_CC/ .*/} -m64 -o "$(emktemp)" "${temp}".c > /dev/null 2>&1
528 local ret=$?
529 rm -f "${temp}".c
530 [[ ${ret} != 1 ]] && return 0
531 return 1
532}
533
534has_m32() {
535 die "${FUNCNAME}: don't use this anymore"
536}
537
538# @FUNCTION: replace-sparc64-flags
539# @DESCRIPTION:
540# Sets mcpu to v8 and uses the original value as mtune if none specified.
541replace-sparc64-flags() {
542 local SPARC64_CPUS="ultrasparc3 ultrasparc v9"
543
544 if [ "${CFLAGS/mtune}" != "${CFLAGS}" ]; then
545 for x in ${SPARC64_CPUS}; do
546 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8}"
547 done
548 else
549 for x in ${SPARC64_CPUS}; do
550 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
551 done
552 fi
553
554 if [ "${CXXFLAGS/mtune}" != "${CXXFLAGS}" ]; then
555 for x in ${SPARC64_CPUS}; do
556 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8}"
557 done
558 else
559 for x in ${SPARC64_CPUS}; do
560 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
561 done
562 fi
563
564 export CFLAGS CXXFLAGS
565}
566
567# @FUNCTION: append-libs
568# @USAGE: <libs>
569# @DESCRIPTION:
570# Add extra <libs> to the current LIBS.
571append-libs() {
572 [[ $# -eq 0 ]] && return 0
573 local flag
574 for flag in "$@"; do
575 [[ ${flag} == -l* ]] && flag=${flag#-l}
576 export LIBS="${LIBS} -l${flag}"
577 done
578
579 return 0
580}
581
582# @FUNCTION: raw-ldflags
583# @USAGE: [flags]
584# @DESCRIPTION:
585# Turn C style ldflags (-Wl,-foo) into straight ldflags - the results
586# are suitable for passing directly to 'ld'; note LDFLAGS is usually passed
587# to gcc where it needs the '-Wl,'.
7# 588#
8#### filter-flags <flag> #### 589# If no flags are specified, then default to ${LDFLAGS}.
9# Remove particular flags from C[XX]FLAGS 590raw-ldflags() {
10# 591 local x input="$@"
11#### append-flags <flag> #### 592 [[ -z ${input} ]] && input=${LDFLAGS}
12# Add extra flags to your current C[XX]FLAGS 593 set --
13#
14#### change-flags <orig.flag> <new.flag> ###
15# Replace a flag by another one
16#
17
18
19filter-flags () {
20
21 for x in $1; do 594 for x in ${input} ; do
22 CFLAGS="${CFLAGS/$x}" 595 x=${x#-Wl,}
23 CXXFLAGS="${CXXFLAGS/$x}" 596 set -- "$@" ${x//,/ }
24 done 597 done
25 598 echo "$@"
26} 599}
27 600
28append-flags () { 601# @FUNCTION: no-as-needed
29 602# @RETURN: Flag to disable asneeded behavior for use with append-ldflags.
30 603no-as-needed() {
31 CFLAGS="$CFLAGS $1" 604 case $($(tc-getLD) -v 2>&1 </dev/null) in
32 CXXFLAGS="$CXXFLAGS $1" 605 *GNU*) # GNU ld
33 606 echo "-Wl,--no-as-needed" ;;
607 esac
34} 608}
35 609
36change-flags () { 610fi
37
38 CFLAGS="${CFLAGS/${1}/${2}"
39 CXXFLAGS="${CXXFLAGS/${1}/${2}"
40
41}

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