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Revision 1.191 - (show annotations) (download)
Sun Oct 27 07:21:05 2013 UTC (11 months ago) by mgorny
Branch: MAIN
Changes since 1.190: +2 -2 lines
Consider -frecord-gcc-switches a safe flag and do not strip it with strip-flags.

1 # Copyright 1999-2013 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 1.190 2013/10/12 19:50:02 vapier 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 -frecord-gcc-switches"
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+=" $*"
148 return 0
149 }
150
151 # @FUNCTION: append-cflags
152 # @USAGE: <flags>
153 # @DESCRIPTION:
154 # Add extra <flags> to the current CFLAGS. If a flag might not be supported
155 # with different compilers (or versions), then use test-flags-CC like so:
156 # @CODE
157 # append-cflags $(test-flags-CC -funky-flag)
158 # @CODE
159 append-cflags() {
160 [[ $# -eq 0 ]] && return 0
161 # Do not do automatic flag testing ourselves. #417047
162 export CFLAGS+=" $*"
163 return 0
164 }
165
166 # @FUNCTION: append-cxxflags
167 # @USAGE: <flags>
168 # @DESCRIPTION:
169 # Add extra <flags> to the current CXXFLAGS. If a flag might not be supported
170 # with different compilers (or versions), then use test-flags-CXX like so:
171 # @CODE
172 # append-cxxflags $(test-flags-CXX -funky-flag)
173 # @CODE
174 append-cxxflags() {
175 [[ $# -eq 0 ]] && return 0
176 # Do not do automatic flag testing ourselves. #417047
177 export CXXFLAGS+=" $*"
178 return 0
179 }
180
181 # @FUNCTION: append-fflags
182 # @USAGE: <flags>
183 # @DESCRIPTION:
184 # Add extra <flags> to the current {F,FC}FLAGS. If a flag might not be supported
185 # with different compilers (or versions), then use test-flags-F77 like so:
186 # @CODE
187 # append-fflags $(test-flags-F77 -funky-flag)
188 # @CODE
189 append-fflags() {
190 [[ $# -eq 0 ]] && return 0
191 # Do not do automatic flag testing ourselves. #417047
192 export FFLAGS+=" $*"
193 export FCFLAGS+=" $*"
194 return 0
195 }
196
197 # @FUNCTION: append-lfs-flags
198 # @DESCRIPTION:
199 # Add flags that enable Large File Support.
200 append-lfs-flags() {
201 [[ $# -ne 0 ]] && die "append-lfs-flags takes no arguments"
202 # see comments in filter-lfs-flags func for meaning of these
203 append-cppflags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
204 }
205
206 # @FUNCTION: append-ldflags
207 # @USAGE: <flags>
208 # @DESCRIPTION:
209 # Add extra <flags> to the current LDFLAGS.
210 append-ldflags() {
211 [[ $# -eq 0 ]] && return 0
212 local flag
213 for flag in "$@"; do
214 [[ ${flag} == -l* ]] && \
215 eqawarn "Appending a library link instruction (${flag}); libraries to link to should not be passed through LDFLAGS"
216 done
217
218 export LDFLAGS="${LDFLAGS} $*"
219 return 0
220 }
221
222 # @FUNCTION: append-flags
223 # @USAGE: <flags>
224 # @DESCRIPTION:
225 # Add extra <flags> to your current {C,CXX,F,FC}FLAGS.
226 append-flags() {
227 [[ $# -eq 0 ]] && return 0
228 case " $* " in
229 *' '-[DIU]*) eqawarn 'please use append-cppflags for preprocessor flags' ;;
230 *' '-L*|\
231 *' '-Wl,*) eqawarn 'please use append-ldflags for linker flags' ;;
232 esac
233 append-cflags "$@"
234 append-cxxflags "$@"
235 append-fflags "$@"
236 return 0
237 }
238
239 # @FUNCTION: replace-flags
240 # @USAGE: <old> <new>
241 # @DESCRIPTION:
242 # Replace the <old> flag with <new>. Accepts shell globs for <old>.
243 replace-flags() {
244 [[ $# != 2 ]] && die "Usage: replace-flags <old flag> <new flag>"
245
246 local f var new
247 for var in $(all-flag-vars) ; do
248 # Looping over the flags instead of using a global
249 # substitution ensures that we're working with flag atoms.
250 # Otherwise globs like -O* have the potential to wipe out the
251 # list of flags.
252 new=()
253 for f in ${!var} ; do
254 # Note this should work with globs like -O*
255 [[ ${f} == ${1} ]] && f=${2}
256 new+=( "${f}" )
257 done
258 eval export ${var}=\""${new[*]}"\"
259 done
260
261 return 0
262 }
263
264 # @FUNCTION: replace-cpu-flags
265 # @USAGE: <old> <new>
266 # @DESCRIPTION:
267 # Replace cpu flags (like -march/-mcpu/-mtune) that select the <old> cpu
268 # with flags that select the <new> cpu. Accepts shell globs for <old>.
269 replace-cpu-flags() {
270 local newcpu="$#" ; newcpu="${!newcpu}"
271 while [ $# -gt 1 ] ; do
272 # quote to make sure that no globbing is done (particularly on
273 # ${oldcpu}) prior to calling replace-flags
274 replace-flags "-march=${1}" "-march=${newcpu}"
275 replace-flags "-mcpu=${1}" "-mcpu=${newcpu}"
276 replace-flags "-mtune=${1}" "-mtune=${newcpu}"
277 shift
278 done
279 return 0
280 }
281
282 _is_flagq() {
283 local x var
284 eval var=\""\${$1[*]}"\"
285 for x in ${var} ; do
286 [[ ${x} == $2 ]] && return 0
287 done
288 return 1
289 }
290
291 # @FUNCTION: is-flagq
292 # @USAGE: <flag>
293 # @DESCRIPTION:
294 # Returns shell true if <flag> is in {C,CXX,F,FC}FLAGS, else returns shell false. Accepts shell globs.
295 is-flagq() {
296 [[ -n $2 ]] && die "Usage: is-flag <flag>"
297
298 local var
299 for var in $(all-flag-vars) ; do
300 _is_flagq ${var} "$1" && return 0
301 done
302 return 1
303 }
304
305 # @FUNCTION: is-flag
306 # @USAGE: <flag>
307 # @DESCRIPTION:
308 # Echo's "true" if flag is set in {C,CXX,F,FC}FLAGS. Accepts shell globs.
309 is-flag() {
310 is-flagq "$@" && echo true
311 }
312
313 # @FUNCTION: is-ldflagq
314 # @USAGE: <flag>
315 # @DESCRIPTION:
316 # Returns shell true if <flag> is in LDFLAGS, else returns shell false. Accepts shell globs.
317 is-ldflagq() {
318 [[ -n $2 ]] && die "Usage: is-ldflag <flag>"
319 _is_flagq LDFLAGS $1
320 }
321
322 # @FUNCTION: is-ldflag
323 # @USAGE: <flag>
324 # @DESCRIPTION:
325 # Echo's "true" if flag is set in LDFLAGS. Accepts shell globs.
326 is-ldflag() {
327 is-ldflagq "$@" && echo true
328 }
329
330 # @FUNCTION: filter-mfpmath
331 # @USAGE: <math types>
332 # @DESCRIPTION:
333 # Remove specified math types from the fpmath flag. For example, if the user
334 # has -mfpmath=sse,386, running `filter-mfpmath sse` will leave the user with
335 # -mfpmath=386.
336 filter-mfpmath() {
337 local orig_mfpmath new_math prune_math
338
339 # save the original -mfpmath flag
340 orig_mfpmath=$(get-flag -mfpmath)
341 # get the value of the current -mfpmath flag
342 new_math=$(get-flag mfpmath)
343 # convert "both" to something we can filter
344 new_math=${new_math/both/387,sse}
345 new_math=" ${new_math//[,+]/ } "
346 # figure out which math values are to be removed
347 prune_math=""
348 for prune_math in "$@" ; do
349 new_math=${new_math/ ${prune_math} / }
350 done
351 new_math=$(echo ${new_math})
352 new_math=${new_math// /,}
353
354 if [[ -z ${new_math} ]] ; then
355 # if we're removing all user specified math values are
356 # slated for removal, then we just filter the flag
357 filter-flags ${orig_mfpmath}
358 else
359 # if we only want to filter some of the user specified
360 # math values, then we replace the current flag
361 replace-flags ${orig_mfpmath} -mfpmath=${new_math}
362 fi
363 return 0
364 }
365
366 # @FUNCTION: strip-flags
367 # @DESCRIPTION:
368 # Strip *FLAGS of everything except known good/safe flags. This runs over all
369 # flags returned by all_flag_vars().
370 strip-flags() {
371 local x y var
372
373 setup-allowed-flags
374
375 set -f # disable pathname expansion
376
377 for var in $(all-flag-vars) ; do
378 local new=()
379
380 for x in ${!var} ; do
381 local flag=${x%%=*}
382 for y in ${ALLOWED_FLAGS} ; do
383 if [[ -z ${flag%%${y}} ]] ; then
384 new+=( "${x}" )
385 break
386 fi
387 done
388 done
389
390 # In case we filtered out all optimization flags fallback to -O2
391 if _is_flagq ${var} "-O*" && ! _is_flagq new "-O*" ; then
392 new+=( -O2 )
393 fi
394
395 if [[ ${!var} != "${new[*]}" ]] ; then
396 einfo "strip-flags: ${var}: changed '${!var}' to '${new[*]}'"
397 fi
398 eval export ${var}=\""${new[*]}"\"
399 done
400
401 set +f # re-enable pathname expansion
402
403 return 0
404 }
405
406 test-flag-PROG() {
407 local comp=$1
408 local lang=$2
409 local flag=$3
410
411 [[ -z ${comp} || -z ${flag} ]] && return 1
412
413 # use -c so we can test the assembler as well
414 local PROG=$(tc-get${comp})
415 if ${PROG} -c -o /dev/null -x${lang} - < /dev/null > /dev/null 2>&1 ; then
416 ${PROG} "${flag}" -c -o /dev/null -x${lang} - < /dev/null \
417 > /dev/null 2>&1
418 else
419 ${PROG} "${flag}" -c -o /dev/null /dev/null > /dev/null 2>&1
420 fi
421 }
422
423 # @FUNCTION: test-flag-CC
424 # @USAGE: <flag>
425 # @DESCRIPTION:
426 # Returns shell true if <flag> is supported by the C compiler, else returns shell false.
427 test-flag-CC() { test-flag-PROG "CC" c "$1"; }
428
429 # @FUNCTION: test-flag-CXX
430 # @USAGE: <flag>
431 # @DESCRIPTION:
432 # Returns shell true if <flag> is supported by the C++ compiler, else returns shell false.
433 test-flag-CXX() { test-flag-PROG "CXX" c++ "$1"; }
434
435 # @FUNCTION: test-flag-F77
436 # @USAGE: <flag>
437 # @DESCRIPTION:
438 # Returns shell true if <flag> is supported by the Fortran 77 compiler, else returns shell false.
439 test-flag-F77() { test-flag-PROG "F77" f77 "$1"; }
440
441 # @FUNCTION: test-flag-FC
442 # @USAGE: <flag>
443 # @DESCRIPTION:
444 # Returns shell true if <flag> is supported by the Fortran 90 compiler, else returns shell false.
445 test-flag-FC() { test-flag-PROG "FC" f95 "$1"; }
446
447 test-flags-PROG() {
448 local comp=$1
449 local flags=()
450 local x
451
452 shift
453
454 [[ -z ${comp} ]] && return 1
455
456 for x ; do
457 test-flag-${comp} "${x}" && flags+=( "${x}" )
458 done
459
460 echo "${flags[*]}"
461
462 # Just bail if we dont have any flags
463 [[ ${#flags[@]} -gt 0 ]]
464 }
465
466 # @FUNCTION: test-flags-CC
467 # @USAGE: <flags>
468 # @DESCRIPTION:
469 # Returns shell true if <flags> are supported by the C compiler, else returns shell false.
470 test-flags-CC() { test-flags-PROG "CC" "$@"; }
471
472 # @FUNCTION: test-flags-CXX
473 # @USAGE: <flags>
474 # @DESCRIPTION:
475 # Returns shell true if <flags> are supported by the C++ compiler, else returns shell false.
476 test-flags-CXX() { test-flags-PROG "CXX" "$@"; }
477
478 # @FUNCTION: test-flags-F77
479 # @USAGE: <flags>
480 # @DESCRIPTION:
481 # Returns shell true if <flags> are supported by the Fortran 77 compiler, else returns shell false.
482 test-flags-F77() { test-flags-PROG "F77" "$@"; }
483
484 # @FUNCTION: test-flags-FC
485 # @USAGE: <flags>
486 # @DESCRIPTION:
487 # Returns shell true if <flags> are supported by the Fortran 90 compiler, else returns shell false.
488 test-flags-FC() { test-flags-PROG "FC" "$@"; }
489
490 # @FUNCTION: test-flags
491 # @USAGE: <flags>
492 # @DESCRIPTION:
493 # Short-hand that should hopefully work for both C and C++ compiler, but
494 # its really only present due to the append-flags() abomination.
495 test-flags() { test-flags-CC "$@"; }
496
497 # @FUNCTION: test_version_info
498 # @USAGE: <version>
499 # @DESCRIPTION:
500 # Returns shell true if the current C compiler version matches <version>, else returns shell false.
501 # Accepts shell globs.
502 test_version_info() {
503 if [[ $($(tc-getCC) --version 2>&1) == *$1* ]]; then
504 return 0
505 else
506 return 1
507 fi
508 }
509
510 # @FUNCTION: strip-unsupported-flags
511 # @DESCRIPTION:
512 # Strip {C,CXX,F,FC}FLAGS of any flags not supported by the active toolchain.
513 strip-unsupported-flags() {
514 export CFLAGS=$(test-flags-CC ${CFLAGS})
515 export CXXFLAGS=$(test-flags-CXX ${CXXFLAGS})
516 export FFLAGS=$(test-flags-F77 ${FFLAGS})
517 export FCFLAGS=$(test-flags-FC ${FCFLAGS})
518 }
519
520 # @FUNCTION: get-flag
521 # @USAGE: <flag>
522 # @DESCRIPTION:
523 # Find and echo the value for a particular flag. Accepts shell globs.
524 get-flag() {
525 local f var findflag="$1"
526
527 # this code looks a little flaky but seems to work for
528 # everything we want ...
529 # for example, if CFLAGS="-march=i686":
530 # `get-flag -march` == "-march=i686"
531 # `get-flag march` == "i686"
532 for var in $(all-flag-vars) ; do
533 for f in ${!var} ; do
534 if [ "${f/${findflag}}" != "${f}" ] ; then
535 printf "%s\n" "${f/-${findflag}=}"
536 return 0
537 fi
538 done
539 done
540 return 1
541 }
542
543 # @FUNCTION: has_m64
544 # @DESCRIPTION:
545 # This doesn't test if the flag is accepted, it tests if the flag actually
546 # WORKS. Non-multilib gcc will take both -m32 and -m64. If the flag works
547 # return code is 0, else the return code is 1.
548 has_m64() {
549 eqawarn "${FUNCNAME}: don't use this anymore"
550
551 # this doesnt test if the flag is accepted, it tests if the flag
552 # actually -WORKS-. non-multilib gcc will take both -m32 and -m64!
553 # please dont replace this function with test_flag in some future
554 # clean-up!
555
556 local temp="$(emktemp)"
557 echo "int main() { return(0); }" > "${temp}".c
558 MY_CC=$(tc-getCC)
559 ${MY_CC/ .*/} -m64 -o "$(emktemp)" "${temp}".c > /dev/null 2>&1
560 local ret=$?
561 rm -f "${temp}".c
562 [[ ${ret} != 1 ]] && return 0
563 return 1
564 }
565
566 has_m32() {
567 die "${FUNCNAME}: don't use this anymore"
568 }
569
570 # @FUNCTION: replace-sparc64-flags
571 # @DESCRIPTION:
572 # Sets mcpu to v8 and uses the original value as mtune if none specified.
573 replace-sparc64-flags() {
574 local SPARC64_CPUS="ultrasparc3 ultrasparc v9"
575
576 if [ "${CFLAGS/mtune}" != "${CFLAGS}" ]; then
577 for x in ${SPARC64_CPUS}; do
578 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8}"
579 done
580 else
581 for x in ${SPARC64_CPUS}; do
582 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
583 done
584 fi
585
586 if [ "${CXXFLAGS/mtune}" != "${CXXFLAGS}" ]; then
587 for x in ${SPARC64_CPUS}; do
588 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8}"
589 done
590 else
591 for x in ${SPARC64_CPUS}; do
592 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
593 done
594 fi
595
596 export CFLAGS CXXFLAGS
597 }
598
599 # @FUNCTION: append-libs
600 # @USAGE: <libs>
601 # @DESCRIPTION:
602 # Add extra <libs> to the current LIBS.
603 append-libs() {
604 [[ $# -eq 0 ]] && return 0
605 local flag
606 for flag in "$@"; do
607 [[ ${flag} == -l* ]] && flag=${flag#-l}
608 export LIBS="${LIBS} -l${flag}"
609 done
610
611 return 0
612 }
613
614 # @FUNCTION: raw-ldflags
615 # @USAGE: [flags]
616 # @DESCRIPTION:
617 # Turn C style ldflags (-Wl,-foo) into straight ldflags - the results
618 # are suitable for passing directly to 'ld'; note LDFLAGS is usually passed
619 # to gcc where it needs the '-Wl,'.
620 #
621 # If no flags are specified, then default to ${LDFLAGS}.
622 raw-ldflags() {
623 local x input="$@"
624 [[ -z ${input} ]] && input=${LDFLAGS}
625 set --
626 for x in ${input} ; do
627 case ${x} in
628 -Wl,*)
629 x=${x#-Wl,}
630 set -- "$@" ${x//,/ }
631 ;;
632 *) # Assume it's a compiler driver flag, so throw it away #441808
633 ;;
634 esac
635 done
636 echo "$@"
637 }
638
639 # @FUNCTION: no-as-needed
640 # @RETURN: Flag to disable asneeded behavior for use with append-ldflags.
641 no-as-needed() {
642 case $($(tc-getLD) -v 2>&1 </dev/null) in
643 *GNU*) # GNU ld
644 echo "-Wl,--no-as-needed" ;;
645 esac
646 }
647
648 fi

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