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Revision 1.177 - (show annotations) (download)
Sat Jun 23 22:21:50 2012 UTC (2 years, 5 months ago) by vapier
Branch: MAIN
Changes since 1.176: +2 -2 lines
use eqawarn rather than ewarn for append-ldflags checking #423159 by Pacho Ramos

1 # Copyright 1999-2012 Gentoo Foundation
2 # Distributed under the terms of the GNU General Public License v2
3 # $Header: /var/cvsroot/gentoo-x86/eclass/flag-o-matic.eclass,v 1.176 2012/06/18 06:45:28 grobian Exp $
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
13 if [[ ${___ECLASS_ONCE_FLAG_O_MATIC} != "recur -_+^+_- spank" ]] ; then
14 ___ECLASS_ONCE_FLAG_O_MATIC="recur -_+^+_- spank"
15
16 inherit eutils toolchain-funcs multilib
17
18 # Return all the flag variables that our high level funcs operate on.
19 all-flag-vars() {
20 echo {C,CPP,CXX,CCAS,F,FC,LD}FLAGS
21 }
22
23 # {C,CPP,CXX,CCAS,F,FC,LD}FLAGS that we allow in strip-flags
24 # Note: shell globs and character lists are allowed
25 setup-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 # 4.7
56 ALLOWED_FLAGS+=" -mno-avx2 -mno-bmi2 -mno-fma -mno-lzcnt"
57
58 # CPPFLAGS and LDFLAGS
59 ALLOWED_FLAGS+=" -I* -L* -R* -Wl,*"
60
61 export ALLOWED_FLAGS
62 return 0
63 }
64
65 # inverted filters for hardened compiler. This is trying to unpick
66 # the hardened compiler defaults.
67 _filter-hardened() {
68 local f
69 for f in "$@" ; do
70 case "${f}" in
71 # Ideally we should only concern ourselves with PIE flags,
72 # not -fPIC or -fpic, but too many places filter -fPIC without
73 # thinking about -fPIE.
74 -fPIC|-fpic|-fPIE|-fpie|-Wl,pie|-pie)
75 gcc-specs-pie || continue
76 is-flagq -nopie || append-flags -nopie;;
77 -fstack-protector)
78 gcc-specs-ssp || continue
79 is-flagq -fno-stack-protector || append-flags $(test-flags -fno-stack-protector);;
80 -fstack-protector-all)
81 gcc-specs-ssp-to-all || continue
82 is-flagq -fno-stack-protector-all || append-flags $(test-flags -fno-stack-protector-all);;
83 -fno-strict-overflow)
84 gcc-specs-nostrict || continue
85 is-flagq -fstrict-overflow || append-flags $(test-flags -fstrict-overflow);;
86 esac
87 done
88 }
89
90 # Remove occurrences of strings from variable given in $1
91 # Strings removed are matched as globs, so for example
92 # '-O*' would remove -O1, -O2 etc.
93 _filter-var() {
94 local f x var=$1 new=()
95 shift
96
97 for f in ${!var} ; do
98 for x in "$@" ; do
99 # Note this should work with globs like -O*
100 [[ ${f} == ${x} ]] && continue 2
101 done
102 new+=( "${f}" )
103 done
104 eval export ${var}=\""${new[*]}"\"
105 }
106
107 # @FUNCTION: filter-flags
108 # @USAGE: <flags>
109 # @DESCRIPTION:
110 # Remove particular <flags> from {C,CPP,CXX,CCAS,F,FC,LD}FLAGS. Accepts shell globs.
111 filter-flags() {
112 _filter-hardened "$@"
113 local v
114 for v in $(all-flag-vars) ; do
115 _filter-var ${v} "$@"
116 done
117 return 0
118 }
119
120 # @FUNCTION: filter-lfs-flags
121 # @DESCRIPTION:
122 # Remove flags that enable Large File Support.
123 filter-lfs-flags() {
124 [[ $# -ne 0 ]] && die "filter-lfs-flags takes no arguments"
125 # http://www.gnu.org/s/libc/manual/html_node/Feature-Test-Macros.html
126 # _LARGEFILE_SOURCE: enable support for new LFS funcs (ftello/etc...)
127 # _LARGEFILE64_SOURCE: enable support for 64bit variants (off64_t/fseeko64/etc...)
128 # _FILE_OFFSET_BITS: default to 64bit variants (off_t is defined as off64_t)
129 filter-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
130 }
131
132 # @FUNCTION: filter-ldflags
133 # @USAGE: <flags>
134 # @DESCRIPTION:
135 # Remove particular <flags> from LDFLAGS. Accepts shell globs.
136 filter-ldflags() {
137 _filter-var LDFLAGS "$@"
138 return 0
139 }
140
141 # @FUNCTION: append-cppflags
142 # @USAGE: <flags>
143 # @DESCRIPTION:
144 # Add extra <flags> to the current CPPFLAGS.
145 append-cppflags() {
146 [[ $# -eq 0 ]] && return 0
147 export CPPFLAGS="${CPPFLAGS} $*"
148 return 0
149 }
150
151 # @FUNCTION: append-cflags
152 # @USAGE: <flags>
153 # @DESCRIPTION:
154 # Add extra <flags> to the current CFLAGS.
155 append-cflags() {
156 [[ $# -eq 0 ]] && return 0
157 export CFLAGS=$(test-flags-CC ${CFLAGS} "$@")
158 return 0
159 }
160
161 # @FUNCTION: append-cxxflags
162 # @USAGE: <flags>
163 # @DESCRIPTION:
164 # Add extra <flags> to the current CXXFLAGS.
165 append-cxxflags() {
166 [[ $# -eq 0 ]] && return 0
167 export CXXFLAGS=$(test-flags-CXX ${CXXFLAGS} "$@")
168 return 0
169 }
170
171 # @FUNCTION: append-fflags
172 # @USAGE: <flags>
173 # @DESCRIPTION:
174 # Add extra <flags> to the current {F,FC}FLAGS.
175 append-fflags() {
176 [[ $# -eq 0 ]] && return 0
177 export FFLAGS=$(test-flags-F77 ${FFLAGS} "$@")
178 export FCFLAGS=$(test-flags-FC ${FCFLAGS} "$@")
179 return 0
180 }
181
182 # @FUNCTION: append-lfs-flags
183 # @DESCRIPTION:
184 # Add flags that enable Large File Support.
185 append-lfs-flags() {
186 [[ $# -ne 0 ]] && die "append-lfs-flags takes no arguments"
187 # see comments in filter-lfs-flags func for meaning of these
188 append-cppflags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
189 }
190
191 # @FUNCTION: append-ldflags
192 # @USAGE: <flags>
193 # @DESCRIPTION:
194 # Add extra <flags> to the current LDFLAGS.
195 append-ldflags() {
196 [[ $# -eq 0 ]] && return 0
197 local flag
198 for flag in "$@"; do
199 [[ ${flag} == -l* ]] && \
200 eqawarn "Appending a library link instruction (${flag}); libraries to link to should not be passed through LDFLAGS"
201 done
202
203 export LDFLAGS="${LDFLAGS} $*"
204 return 0
205 }
206
207 # @FUNCTION: append-flags
208 # @USAGE: <flags>
209 # @DESCRIPTION:
210 # Add extra <flags> to your current {C,CXX,F,FC}FLAGS.
211 append-flags() {
212 [[ $# -eq 0 ]] && return 0
213 case " $* " in
214 *' '-[DIU]*) eqawarn 'please use append-cppflags for preprocessor flags' ;;
215 *' '-L*|\
216 *' '-Wl,*) eqawarn 'please use append-ldflags for linker flags' ;;
217 esac
218 append-cflags "$@"
219 append-cxxflags "$@"
220 append-fflags "$@"
221 return 0
222 }
223
224 # @FUNCTION: replace-flags
225 # @USAGE: <old> <new>
226 # @DESCRIPTION:
227 # Replace the <old> flag with <new>. Accepts shell globs for <old>.
228 replace-flags() {
229 [[ $# != 2 ]] && die "Usage: replace-flags <old flag> <new flag>"
230
231 local f var new
232 for var in $(all-flag-vars) ; do
233 # Looping over the flags instead of using a global
234 # substitution ensures that we're working with flag atoms.
235 # Otherwise globs like -O* have the potential to wipe out the
236 # list of flags.
237 new=()
238 for f in ${!var} ; do
239 # Note this should work with globs like -O*
240 [[ ${f} == ${1} ]] && f=${2}
241 new+=( "${f}" )
242 done
243 eval export ${var}=\""${new[*]}"\"
244 done
245
246 return 0
247 }
248
249 # @FUNCTION: replace-cpu-flags
250 # @USAGE: <old> <new>
251 # @DESCRIPTION:
252 # Replace cpu flags (like -march/-mcpu/-mtune) that select the <old> cpu
253 # with flags that select the <new> cpu. Accepts shell globs for <old>.
254 replace-cpu-flags() {
255 local newcpu="$#" ; newcpu="${!newcpu}"
256 while [ $# -gt 1 ] ; do
257 # quote to make sure that no globbing is done (particularly on
258 # ${oldcpu}) prior to calling replace-flags
259 replace-flags "-march=${1}" "-march=${newcpu}"
260 replace-flags "-mcpu=${1}" "-mcpu=${newcpu}"
261 replace-flags "-mtune=${1}" "-mtune=${newcpu}"
262 shift
263 done
264 return 0
265 }
266
267 _is_flagq() {
268 local x
269 for x in ${!1} ; do
270 [[ ${x} == $2 ]] && return 0
271 done
272 return 1
273 }
274
275 # @FUNCTION: is-flagq
276 # @USAGE: <flag>
277 # @DESCRIPTION:
278 # Returns shell true if <flag> is in {C,CXX,F,FC}FLAGS, else returns shell false. Accepts shell globs.
279 is-flagq() {
280 [[ -n $2 ]] && die "Usage: is-flag <flag>"
281
282 local var
283 for var in $(all-flag-vars) ; do
284 _is_flagq ${var} "$1" && return 0
285 done
286 return 1
287 }
288
289 # @FUNCTION: is-flag
290 # @USAGE: <flag>
291 # @DESCRIPTION:
292 # Echo's "true" if flag is set in {C,CXX,F,FC}FLAGS. Accepts shell globs.
293 is-flag() {
294 is-flagq "$@" && echo true
295 }
296
297 # @FUNCTION: is-ldflagq
298 # @USAGE: <flag>
299 # @DESCRIPTION:
300 # Returns shell true if <flag> is in LDFLAGS, else returns shell false. Accepts shell globs.
301 is-ldflagq() {
302 [[ -n $2 ]] && die "Usage: is-ldflag <flag>"
303 _is_flagq LDFLAGS $1
304 }
305
306 # @FUNCTION: is-ldflag
307 # @USAGE: <flag>
308 # @DESCRIPTION:
309 # Echo's "true" if flag is set in LDFLAGS. Accepts shell globs.
310 is-ldflag() {
311 is-ldflagq "$@" && echo true
312 }
313
314 # @FUNCTION: filter-mfpmath
315 # @USAGE: <math types>
316 # @DESCRIPTION:
317 # Remove specified math types from the fpmath flag. For example, if the user
318 # has -mfpmath=sse,386, running `filter-mfpmath sse` will leave the user with
319 # -mfpmath=386.
320 filter-mfpmath() {
321 local orig_mfpmath new_math prune_math
322
323 # save the original -mfpmath flag
324 orig_mfpmath=$(get-flag -mfpmath)
325 # get the value of the current -mfpmath flag
326 new_math=$(get-flag mfpmath)
327 new_math=" ${new_math//,/ } "
328 # figure out which math values are to be removed
329 prune_math=""
330 for prune_math in "$@" ; do
331 new_math=${new_math/ ${prune_math} / }
332 done
333 new_math=$(echo ${new_math})
334 new_math=${new_math// /,}
335
336 if [[ -z ${new_math} ]] ; then
337 # if we're removing all user specified math values are
338 # slated for removal, then we just filter the flag
339 filter-flags ${orig_mfpmath}
340 else
341 # if we only want to filter some of the user specified
342 # math values, then we replace the current flag
343 replace-flags ${orig_mfpmath} -mfpmath=${new_math}
344 fi
345 return 0
346 }
347
348 # @FUNCTION: strip-flags
349 # @DESCRIPTION:
350 # Strip *FLAGS of everything except known good/safe flags. This runs over all
351 # flags returned by all_flag_vars().
352 strip-flags() {
353 local x y var
354
355 setup-allowed-flags
356
357 set -f # disable pathname expansion
358
359 for var in $(all-flag-vars) ; do
360 local new=()
361
362 for x in ${!var} ; do
363 local flag=${x%%=*}
364 for y in ${ALLOWED_FLAGS} ; do
365 if [[ -z ${flag%%${y}} ]] ; then
366 new+=( "${x}" )
367 break
368 fi
369 done
370 done
371
372 # In case we filtered out all optimization flags fallback to -O2
373 if _is_flagq ${var} "-O*" && ! _is_flagq new "-O*" ; then
374 new+=( -O2 )
375 fi
376
377 eval export ${var}=\""${new[*]}"\"
378 done
379
380 set +f # re-enable pathname expansion
381
382 return 0
383 }
384
385 test-flag-PROG() {
386 local comp=$1
387 local flag=$2
388
389 [[ -z ${comp} || -z ${flag} ]] && return 1
390
391 # use -c so we can test the assembler as well
392 local PROG=$(tc-get${comp})
393 ${PROG} "${flag}" -c -o /dev/null -xc /dev/null \
394 > /dev/null 2>&1
395 }
396
397 # @FUNCTION: test-flag-CC
398 # @USAGE: <flag>
399 # @DESCRIPTION:
400 # Returns shell true if <flag> is supported by the C compiler, else returns shell false.
401 test-flag-CC() { test-flag-PROG "CC" "$1"; }
402
403 # @FUNCTION: test-flag-CXX
404 # @USAGE: <flag>
405 # @DESCRIPTION:
406 # Returns shell true if <flag> is supported by the C++ compiler, else returns shell false.
407 test-flag-CXX() { test-flag-PROG "CXX" "$1"; }
408
409 # @FUNCTION: test-flag-F77
410 # @USAGE: <flag>
411 # @DESCRIPTION:
412 # Returns shell true if <flag> is supported by the Fortran 77 compiler, else returns shell false.
413 test-flag-F77() { test-flag-PROG "F77" "$1"; }
414
415 # @FUNCTION: test-flag-FC
416 # @USAGE: <flag>
417 # @DESCRIPTION:
418 # Returns shell true if <flag> is supported by the Fortran 90 compiler, else returns shell false.
419 test-flag-FC() { test-flag-PROG "FC" "$1"; }
420
421 test-flags-PROG() {
422 local comp=$1
423 local flags
424 local x
425
426 shift
427
428 [[ -z ${comp} ]] && return 1
429
430 for x in "$@" ; do
431 test-flag-${comp} "${x}" && flags="${flags}${flags:+ }${x}"
432 done
433
434 echo "${flags}"
435
436 # Just bail if we dont have any flags
437 [[ -n ${flags} ]]
438 }
439
440 # @FUNCTION: test-flags-CC
441 # @USAGE: <flags>
442 # @DESCRIPTION:
443 # Returns shell true if <flags> are supported by the C compiler, else returns shell false.
444 test-flags-CC() { test-flags-PROG "CC" "$@"; }
445
446 # @FUNCTION: test-flags-CXX
447 # @USAGE: <flags>
448 # @DESCRIPTION:
449 # Returns shell true if <flags> are supported by the C++ compiler, else returns shell false.
450 test-flags-CXX() { test-flags-PROG "CXX" "$@"; }
451
452 # @FUNCTION: test-flags-F77
453 # @USAGE: <flags>
454 # @DESCRIPTION:
455 # Returns shell true if <flags> are supported by the Fortran 77 compiler, else returns shell false.
456 test-flags-F77() { test-flags-PROG "F77" "$@"; }
457
458 # @FUNCTION: test-flags-FC
459 # @USAGE: <flags>
460 # @DESCRIPTION:
461 # Returns shell true if <flags> are supported by the Fortran 90 compiler, else returns shell false.
462 test-flags-FC() { test-flags-PROG "FC" "$@"; }
463
464 # @FUNCTION: test-flags
465 # @USAGE: <flags>
466 # @DESCRIPTION:
467 # Short-hand that should hopefully work for both C and C++ compiler, but
468 # its really only present due to the append-flags() abomination.
469 test-flags() { test-flags-CC "$@"; }
470
471 # @FUNCTION: test_version_info
472 # @USAGE: <version>
473 # @DESCRIPTION:
474 # Returns shell true if the current C compiler version matches <version>, else returns shell false.
475 # Accepts shell globs.
476 test_version_info() {
477 if [[ $($(tc-getCC) --version 2>&1) == *$1* ]]; then
478 return 0
479 else
480 return 1
481 fi
482 }
483
484 # @FUNCTION: strip-unsupported-flags
485 # @DESCRIPTION:
486 # Strip {C,CXX,F,FC}FLAGS of any flags not supported by the active toolchain.
487 strip-unsupported-flags() {
488 export CFLAGS=$(test-flags-CC ${CFLAGS})
489 export CXXFLAGS=$(test-flags-CXX ${CXXFLAGS})
490 export FFLAGS=$(test-flags-F77 ${FFLAGS})
491 export FCFLAGS=$(test-flags-FC ${FCFLAGS})
492 }
493
494 # @FUNCTION: get-flag
495 # @USAGE: <flag>
496 # @DESCRIPTION:
497 # Find and echo the value for a particular flag. Accepts shell globs.
498 get-flag() {
499 local f var findflag="$1"
500
501 # this code looks a little flaky but seems to work for
502 # everything we want ...
503 # for example, if CFLAGS="-march=i686":
504 # `get-flag -march` == "-march=i686"
505 # `get-flag march` == "i686"
506 for var in $(all-flag-vars) ; do
507 for f in ${!var} ; do
508 if [ "${f/${findflag}}" != "${f}" ] ; then
509 printf "%s\n" "${f/-${findflag}=}"
510 return 0
511 fi
512 done
513 done
514 return 1
515 }
516
517 # @FUNCTION: has_m64
518 # @DESCRIPTION:
519 # This doesn't test if the flag is accepted, it tests if the flag actually
520 # WORKS. Non-multilib gcc will take both -m32 and -m64. If the flag works
521 # return code is 0, else the return code is 1.
522 has_m64() {
523 eqawarn "${FUNCNAME}: don't use this anymore"
524
525 # this doesnt test if the flag is accepted, it tests if the flag
526 # actually -WORKS-. non-multilib gcc will take both -m32 and -m64!
527 # please dont replace this function with test_flag in some future
528 # clean-up!
529
530 local temp="$(emktemp)"
531 echo "int main() { return(0); }" > "${temp}".c
532 MY_CC=$(tc-getCC)
533 ${MY_CC/ .*/} -m64 -o "$(emktemp)" "${temp}".c > /dev/null 2>&1
534 local ret=$?
535 rm -f "${temp}".c
536 [[ ${ret} != 1 ]] && return 0
537 return 1
538 }
539
540 has_m32() {
541 die "${FUNCNAME}: don't use this anymore"
542 }
543
544 # @FUNCTION: replace-sparc64-flags
545 # @DESCRIPTION:
546 # Sets mcpu to v8 and uses the original value as mtune if none specified.
547 replace-sparc64-flags() {
548 local SPARC64_CPUS="ultrasparc3 ultrasparc v9"
549
550 if [ "${CFLAGS/mtune}" != "${CFLAGS}" ]; then
551 for x in ${SPARC64_CPUS}; do
552 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8}"
553 done
554 else
555 for x in ${SPARC64_CPUS}; do
556 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
557 done
558 fi
559
560 if [ "${CXXFLAGS/mtune}" != "${CXXFLAGS}" ]; then
561 for x in ${SPARC64_CPUS}; do
562 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8}"
563 done
564 else
565 for x in ${SPARC64_CPUS}; do
566 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
567 done
568 fi
569
570 export CFLAGS CXXFLAGS
571 }
572
573 # @FUNCTION: append-libs
574 # @USAGE: <libs>
575 # @DESCRIPTION:
576 # Add extra <libs> to the current LIBS.
577 append-libs() {
578 [[ $# -eq 0 ]] && return 0
579 local flag
580 for flag in "$@"; do
581 [[ ${flag} == -l* ]] && flag=${flag#-l}
582 export LIBS="${LIBS} -l${flag}"
583 done
584
585 return 0
586 }
587
588 # @FUNCTION: raw-ldflags
589 # @USAGE: [flags]
590 # @DESCRIPTION:
591 # Turn C style ldflags (-Wl,-foo) into straight ldflags - the results
592 # are suitable for passing directly to 'ld'; note LDFLAGS is usually passed
593 # to gcc where it needs the '-Wl,'.
594 #
595 # If no flags are specified, then default to ${LDFLAGS}.
596 raw-ldflags() {
597 local x input="$@"
598 [[ -z ${input} ]] && input=${LDFLAGS}
599 set --
600 for x in ${input} ; do
601 x=${x#-Wl,}
602 set -- "$@" ${x//,/ }
603 done
604 echo "$@"
605 }
606
607 # @FUNCTION: no-as-needed
608 # @RETURN: Flag to disable asneeded behavior for use with append-ldflags.
609 no-as-needed() {
610 case $($(tc-getLD) -v 2>&1 </dev/null) in
611 *GNU*) # GNU ld
612 echo "-Wl,--no-as-needed" ;;
613 esac
614 }
615
616 fi

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