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1# Copyright 1999-2002 Gentoo Technologies, Inc. 1# Copyright 1999-2013 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 1.187 2013/01/12 14:32:31 jlec 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,CPP,CXX,CCAS,F,FC,LD}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 # 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.
111filter-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.
123filter-lfs-flags() {
124 [[ $# -ne 0 ]] && die "filter-lfs-flags takes no arguments"
125 # http://www.gnu.org/s/libc/manual/html_node/Feature-Test-Macros.html
126 # _LARGEFILE_SOURCE: enable support for new LFS funcs (ftello/etc...)
127 # _LARGEFILE64_SOURCE: enable support for 64bit variants (off64_t/fseeko64/etc...)
128 # _FILE_OFFSET_BITS: default to 64bit variants (off_t is defined as off64_t)
129 filter-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
130}
131
132# @FUNCTION: filter-ldflags
133# @USAGE: <flags>
134# @DESCRIPTION:
135# Remove particular <flags> from LDFLAGS. Accepts shell globs.
136filter-ldflags() {
137 _filter-var LDFLAGS "$@"
138 return 0
139}
140
141# @FUNCTION: append-cppflags
142# @USAGE: <flags>
143# @DESCRIPTION:
144# Add extra <flags> to the current CPPFLAGS.
145append-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.
155append-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.
165append-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.
175append-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.
185append-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.
195append-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.
211append-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>.
228replace-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>.
254replace-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 var
269 eval var=\""\${$1[*]}"\"
270 for x in ${var} ; do
271 [[ ${x} == $2 ]] && return 0
272 done
273 return 1
274}
275
276# @FUNCTION: is-flagq
277# @USAGE: <flag>
278# @DESCRIPTION:
279# Returns shell true if <flag> is in {C,CXX,F,FC}FLAGS, else returns shell false. Accepts shell globs.
280is-flagq() {
281 [[ -n $2 ]] && die "Usage: is-flag <flag>"
282
283 local var
284 for var in $(all-flag-vars) ; do
285 _is_flagq ${var} "$1" && return 0
286 done
287 return 1
288}
289
290# @FUNCTION: is-flag
291# @USAGE: <flag>
292# @DESCRIPTION:
293# Echo's "true" if flag is set in {C,CXX,F,FC}FLAGS. Accepts shell globs.
294is-flag() {
295 is-flagq "$@" && echo true
296}
297
298# @FUNCTION: is-ldflagq
299# @USAGE: <flag>
300# @DESCRIPTION:
301# Returns shell true if <flag> is in LDFLAGS, else returns shell false. Accepts shell globs.
302is-ldflagq() {
303 [[ -n $2 ]] && die "Usage: is-ldflag <flag>"
304 _is_flagq LDFLAGS $1
305}
306
307# @FUNCTION: is-ldflag
308# @USAGE: <flag>
309# @DESCRIPTION:
310# Echo's "true" if flag is set in LDFLAGS. Accepts shell globs.
311is-ldflag() {
312 is-ldflagq "$@" && echo true
313}
314
315# @FUNCTION: filter-mfpmath
316# @USAGE: <math types>
317# @DESCRIPTION:
318# Remove specified math types from the fpmath flag. For example, if the user
319# has -mfpmath=sse,386, running `filter-mfpmath sse` will leave the user with
320# -mfpmath=386.
321filter-mfpmath() {
322 local orig_mfpmath new_math prune_math
323
324 # save the original -mfpmath flag
325 orig_mfpmath=$(get-flag -mfpmath)
326 # get the value of the current -mfpmath flag
327 new_math=$(get-flag mfpmath)
328 new_math=" ${new_math//,/ } "
329 # figure out which math values are to be removed
330 prune_math=""
331 for prune_math in "$@" ; do
332 new_math=${new_math/ ${prune_math} / }
333 done
334 new_math=$(echo ${new_math})
335 new_math=${new_math// /,}
336
337 if [[ -z ${new_math} ]] ; then
338 # if we're removing all user specified math values are
339 # slated for removal, then we just filter the flag
340 filter-flags ${orig_mfpmath}
341 else
342 # if we only want to filter some of the user specified
343 # math values, then we replace the current flag
344 replace-flags ${orig_mfpmath} -mfpmath=${new_math}
345 fi
346 return 0
347}
348
349# @FUNCTION: strip-flags
350# @DESCRIPTION:
351# Strip *FLAGS of everything except known good/safe flags. This runs over all
352# flags returned by all_flag_vars().
353strip-flags() {
354 local x y var
355
356 setup-allowed-flags
357
358 set -f # disable pathname expansion
359
360 for var in $(all-flag-vars) ; do
361 local new=()
362
363 for x in ${!var} ; do
364 local flag=${x%%=*}
365 for y in ${ALLOWED_FLAGS} ; do
366 if [[ -z ${flag%%${y}} ]] ; then
367 new+=( "${x}" )
368 break
369 fi
370 done
371 done
372
373 # In case we filtered out all optimization flags fallback to -O2
374 if _is_flagq ${var} "-O*" && ! _is_flagq new "-O*" ; then
375 new+=( -O2 )
376 fi
377
378 eval export ${var}=\""${new[*]}"\"
379 done
380
381 set +f # re-enable pathname expansion
382
383 return 0
384}
385
386test-flag-PROG() {
387 local comp=$1
388 local lang=$2
389 local flag=$3
390
391 [[ -z ${comp} || -z ${flag} ]] && return 1
392
393 # use -c so we can test the assembler as well
394 local PROG=$(tc-get${comp})
395 if ${PROG} -c -o /dev/null -x${lang} - < /dev/null > /dev/null 2>&1 ; then
396 ${PROG} "${flag}" -c -o /dev/null -x${lang} - < /dev/null \
397 > /dev/null 2>&1
398 else
399 ${PROG} "${flag}" -c -o /dev/null /dev/null > /dev/null 2>&1
400 fi
401}
402
403# @FUNCTION: test-flag-CC
404# @USAGE: <flag>
405# @DESCRIPTION:
406# Returns shell true if <flag> is supported by the C compiler, else returns shell false.
407test-flag-CC() { test-flag-PROG "CC" c "$1"; }
408
409# @FUNCTION: test-flag-CXX
410# @USAGE: <flag>
411# @DESCRIPTION:
412# Returns shell true if <flag> is supported by the C++ compiler, else returns shell false.
413test-flag-CXX() { test-flag-PROG "CXX" c++ "$1"; }
414
415# @FUNCTION: test-flag-F77
416# @USAGE: <flag>
417# @DESCRIPTION:
418# Returns shell true if <flag> is supported by the Fortran 77 compiler, else returns shell false.
419test-flag-F77() { test-flag-PROG "F77" f77 "$1"; }
420
421# @FUNCTION: test-flag-FC
422# @USAGE: <flag>
423# @DESCRIPTION:
424# Returns shell true if <flag> is supported by the Fortran 90 compiler, else returns shell false.
425test-flag-FC() { test-flag-PROG "FC" f95 "$1"; }
426
427test-flags-PROG() {
428 local comp=$1
429 local flags=()
430 local x
431
432 shift
433
434 [[ -z ${comp} ]] && return 1
435
436 for x ; do
437 test-flag-${comp} "${x}" && flags+=( "${x}" )
438 done
439
440 echo "${flags[*]}"
441
442 # Just bail if we dont have any flags
443 [[ ${#flags[@]} -gt 0 ]]
444}
445
446# @FUNCTION: test-flags-CC
447# @USAGE: <flags>
448# @DESCRIPTION:
449# Returns shell true if <flags> are supported by the C compiler, else returns shell false.
450test-flags-CC() { test-flags-PROG "CC" "$@"; }
451
452# @FUNCTION: test-flags-CXX
453# @USAGE: <flags>
454# @DESCRIPTION:
455# Returns shell true if <flags> are supported by the C++ compiler, else returns shell false.
456test-flags-CXX() { test-flags-PROG "CXX" "$@"; }
457
458# @FUNCTION: test-flags-F77
459# @USAGE: <flags>
460# @DESCRIPTION:
461# Returns shell true if <flags> are supported by the Fortran 77 compiler, else returns shell false.
462test-flags-F77() { test-flags-PROG "F77" "$@"; }
463
464# @FUNCTION: test-flags-FC
465# @USAGE: <flags>
466# @DESCRIPTION:
467# Returns shell true if <flags> are supported by the Fortran 90 compiler, else returns shell false.
468test-flags-FC() { test-flags-PROG "FC" "$@"; }
469
470# @FUNCTION: test-flags
471# @USAGE: <flags>
472# @DESCRIPTION:
473# Short-hand that should hopefully work for both C and C++ compiler, but
474# its really only present due to the append-flags() abomination.
475test-flags() { test-flags-CC "$@"; }
476
477# @FUNCTION: test_version_info
478# @USAGE: <version>
479# @DESCRIPTION:
480# Returns shell true if the current C compiler version matches <version>, else returns shell false.
481# Accepts shell globs.
482test_version_info() {
483 if [[ $($(tc-getCC) --version 2>&1) == *$1* ]]; then
484 return 0
485 else
486 return 1
487 fi
488}
489
490# @FUNCTION: strip-unsupported-flags
491# @DESCRIPTION:
492# Strip {C,CXX,F,FC}FLAGS of any flags not supported by the active toolchain.
493strip-unsupported-flags() {
494 export CFLAGS=$(test-flags-CC ${CFLAGS})
495 export CXXFLAGS=$(test-flags-CXX ${CXXFLAGS})
496 export FFLAGS=$(test-flags-F77 ${FFLAGS})
497 export FCFLAGS=$(test-flags-FC ${FCFLAGS})
498}
499
500# @FUNCTION: get-flag
501# @USAGE: <flag>
502# @DESCRIPTION:
503# Find and echo the value for a particular flag. Accepts shell globs.
504get-flag() {
505 local f var findflag="$1"
506
507 # this code looks a little flaky but seems to work for
508 # everything we want ...
509 # for example, if CFLAGS="-march=i686":
510 # `get-flag -march` == "-march=i686"
511 # `get-flag march` == "i686"
512 for var in $(all-flag-vars) ; do
513 for f in ${!var} ; do
514 if [ "${f/${findflag}}" != "${f}" ] ; then
515 printf "%s\n" "${f/-${findflag}=}"
516 return 0
517 fi
518 done
519 done
520 return 1
521}
522
523# @FUNCTION: has_m64
524# @DESCRIPTION:
525# This doesn't test if the flag is accepted, it tests if the flag actually
526# WORKS. Non-multilib gcc will take both -m32 and -m64. If the flag works
527# return code is 0, else the return code is 1.
528has_m64() {
529 eqawarn "${FUNCNAME}: don't use this anymore"
530
531 # this doesnt test if the flag is accepted, it tests if the flag
532 # actually -WORKS-. non-multilib gcc will take both -m32 and -m64!
533 # please dont replace this function with test_flag in some future
534 # clean-up!
535
536 local temp="$(emktemp)"
537 echo "int main() { return(0); }" > "${temp}".c
538 MY_CC=$(tc-getCC)
539 ${MY_CC/ .*/} -m64 -o "$(emktemp)" "${temp}".c > /dev/null 2>&1
540 local ret=$?
541 rm -f "${temp}".c
542 [[ ${ret} != 1 ]] && return 0
543 return 1
544}
545
546has_m32() {
547 die "${FUNCNAME}: don't use this anymore"
548}
549
550# @FUNCTION: replace-sparc64-flags
551# @DESCRIPTION:
552# Sets mcpu to v8 and uses the original value as mtune if none specified.
553replace-sparc64-flags() {
554 local SPARC64_CPUS="ultrasparc3 ultrasparc v9"
555
556 if [ "${CFLAGS/mtune}" != "${CFLAGS}" ]; then
557 for x in ${SPARC64_CPUS}; do
558 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8}"
559 done
560 else
561 for x in ${SPARC64_CPUS}; do
562 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
563 done
564 fi
565
566 if [ "${CXXFLAGS/mtune}" != "${CXXFLAGS}" ]; then
567 for x in ${SPARC64_CPUS}; do
568 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8}"
569 done
570 else
571 for x in ${SPARC64_CPUS}; do
572 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
573 done
574 fi
575
576 export CFLAGS CXXFLAGS
577}
578
579# @FUNCTION: append-libs
580# @USAGE: <libs>
581# @DESCRIPTION:
582# Add extra <libs> to the current LIBS.
583append-libs() {
584 [[ $# -eq 0 ]] && return 0
585 local flag
586 for flag in "$@"; do
587 [[ ${flag} == -l* ]] && flag=${flag#-l}
588 export LIBS="${LIBS} -l${flag}"
589 done
590
591 return 0
592}
593
594# @FUNCTION: raw-ldflags
595# @USAGE: [flags]
596# @DESCRIPTION:
597# Turn C style ldflags (-Wl,-foo) into straight ldflags - the results
598# are suitable for passing directly to 'ld'; note LDFLAGS is usually passed
599# to gcc where it needs the '-Wl,'.
7# 600#
8#### filter-flags <flag> #### 601# If no flags are specified, then default to ${LDFLAGS}.
9# Remove particular flags from C[XX]FLAGS 602raw-ldflags() {
10# 603 local x input="$@"
11#### append-flags <flag> #### 604 [[ -z ${input} ]] && input=${LDFLAGS}
12# Add extra flags to your current C[XX]FLAGS 605 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 606 for x in ${input} ; do
22 CFLAGS="${CFLAGS/$x}" 607 case ${x} in
23 CXXFLAGS="${CXXFLAGS/$x}" 608 -Wl,*)
609 x=${x#-Wl,}
610 set -- "$@" ${x//,/ }
611 ;;
612 *) # Assume it's a compiler driver flag, so throw it away #441808
613 ;;
614 esac
24 done 615 done
25 616 echo "$@"
26} 617}
27 618
28append-flags () { 619# @FUNCTION: no-as-needed
29 620# @RETURN: Flag to disable asneeded behavior for use with append-ldflags.
30 621no-as-needed() {
31 CFLAGS="$CFLAGS $1" 622 case $($(tc-getLD) -v 2>&1 </dev/null) in
32 CXXFLAGS="$CXXFLAGS $1" 623 *GNU*) # GNU ld
33 624 echo "-Wl,--no-as-needed" ;;
625 esac
34} 626}
35 627
36change-flags () { 628fi
37
38 CFLAGS="${CFLAGS/${1}/${2}"
39 CXXFLAGS="${CXXFLAGS/${1}/${2}"
40
41}

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