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Revision 1.163 - (show annotations) (download)
Wed Dec 28 06:28:55 2011 UTC (2 years, 11 months ago) by dirtyepic
Branch: MAIN
Changes since 1.162: +24 -26 lines
Clean up setup-allowed-flags().

1 # Copyright 1999-2011 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 1.162 2011/12/28 05:48:28 dirtyepic 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 ################ DEPRECATED functions ################
19 # The following are still present to avoid breaking existing
20 # code more than necessary; however they are deprecated. Please
21 # use gcc-specs-* from toolchain-funcs.eclass instead, if you
22 # need to know which hardened techs are active in the compiler.
23 # See bug #100974
24 #
25 # has_hardened
26 # has_pie
27 # has_pic
28 # has_ssp_all
29 # has_ssp
30
31
32 # {C,CXX,F,FC}FLAGS that we allow in strip-flags
33 # Note: shell globs and character lists are allowed
34 setup-allowed-flags() {
35 ALLOWED_FLAGS="-pipe"
36 ALLOWED_FLAGS+=" -O -O1 -O2 -Os -mcpu -march -mtune"
37 ALLOWED_FLAGS+=" -fstack-protector -fstack-protector-all"
38 ALLOWED_FLAGS+=" -fbounds-checking -fno-strict-overflow"
39 ALLOWED_FLAGS+=" -fno-PIE -fno-pie -fno-unit-at-a-time"
40 ALLOWED_FLAGS+=" -g -g[0-9] -ggdb -ggdb[0-9] -gstabs -gstabs+"
41 ALLOWED_FLAGS+=" -fno-ident -fpermissive"
42 ALLOWED_FLAGS+=" -W* -w"
43
44 # allow a bunch of flags that negate features / control ABI
45 ALLOWED_FLAGS+=" -fno-stack-protector -fno-stack-protector-all \
46 -fno-strict-aliasing -fno-bounds-checking -fstrict-overflow \
47 -fno-omit-frame-pointer"
48 ALLOWED_FLAGS+=" -mregparm -mno-app-regs -mapp-regs -mno-mmx -mno-sse \
49 -mno-sse2 -mno-sse3 -mno-ssse3 -mno-sse4 -mno-sse4.1 -mno-sse4.2 \
50 -mno-avx -mno-aes -mno-pclmul -mno-sse4a -mno-3dnow -mno-popcnt \
51 -mno-abm -mips1 -mips2 -mips3 -mips4 -mips32 -mips64 -mips16 -mplt \
52 -msoft-float -mno-soft-float -mhard-float -mno-hard-float -mfpu \
53 -mieee -mieee-with-inexact -mschedule -mfloat-gprs -mspe -mno-spe \
54 -mtls-direct-seg-refs -mno-tls-direct-seg-refs -mflat -mno-flat \
55 -mno-faster-structs -mfaster-structs -m32 -m64 -mx32 -mabi \
56 -mlittle-endian -mbig-endian -EL -EB -fPIC -mlive-g0 -mcmodel \
57 -mstack-bias -mno-stack-bias -msecure-plt -m*-toc -D* -U*"
58
59 # 4.5
60 ALLOWED_FLAGS+=" -mno-fma4 -mno-movbe -mno-xop -mno-lwp"
61 # 4.6
62 ALLOWED_FLAGS+=" -mno-fsgsbase -mno-rdrnd -mno-f16c -mno-bmi -mno-tbm"
63
64 export ALLOWED_FLAGS
65 return 0
66 }
67
68 # inverted filters for hardened compiler. This is trying to unpick
69 # the hardened compiler defaults.
70 _filter-hardened() {
71 local f
72 for f in "$@" ; do
73 case "${f}" in
74 # Ideally we should only concern ourselves with PIE flags,
75 # not -fPIC or -fpic, but too many places filter -fPIC without
76 # thinking about -fPIE.
77 -fPIC|-fpic|-fPIE|-fpie|-Wl,pie|-pie)
78 gcc-specs-pie || continue
79 is-flagq -nopie || append-flags -nopie;;
80 -fstack-protector)
81 gcc-specs-ssp || continue
82 is-flagq -fno-stack-protector || append-flags $(test-flags -fno-stack-protector);;
83 -fstack-protector-all)
84 gcc-specs-ssp-to-all || continue
85 is-flagq -fno-stack-protector-all || append-flags $(test-flags -fno-stack-protector-all);;
86 -fno-strict-overflow)
87 gcc-specs-nostrict || continue
88 is-flagq -fstrict-overflow || append-flags $(test-flags -fstrict-overflow);;
89 esac
90 done
91 }
92
93 # Remove occurrences of strings from variable given in $1
94 # Strings removed are matched as globs, so for example
95 # '-O*' would remove -O1, -O2 etc.
96 _filter-var() {
97 local f x VAR VAL
98 declare -a new
99
100 VAR=$1
101 shift
102 eval VAL=\${${VAR}}
103 for f in ${VAL}; do
104 for x in "$@"; do
105 # Note this should work with globs like -O*
106 [[ ${f} == ${x} ]] && continue 2
107 done
108 eval new\[\${\#new\[@]}]=\${f}
109 done
110 eval export ${VAR}=\${new\[*]}
111 }
112
113 # @FUNCTION: filter-flags
114 # @USAGE: <flags>
115 # @DESCRIPTION:
116 # Remove particular <flags> from {C,CPP,CXX,F,FC}FLAGS. Accepts shell globs.
117 filter-flags() {
118 _filter-hardened "$@"
119 _filter-var CFLAGS "$@"
120 _filter-var CPPFLAGS "$@"
121 _filter-var CXXFLAGS "$@"
122 _filter-var FFLAGS "$@"
123 _filter-var FCFLAGS "$@"
124 return 0
125 }
126
127 # @FUNCTION: filter-lfs-flags
128 # @DESCRIPTION:
129 # Remove flags that enable Large File Support.
130 filter-lfs-flags() {
131 [[ $# -ne 0 ]] && die "filter-lfs-flags takes no arguments"
132 # http://www.gnu.org/s/libc/manual/html_node/Feature-Test-Macros.html
133 # _LARGEFILE_SOURCE: enable support for new LFS funcs (ftello/etc...)
134 # _LARGEFILE64_SOURCE: enable support for 64bit variants (off64_t/fseeko64/etc...)
135 # _FILE_OFFSET_BITS: default to 64bit variants (off_t is defined as off64_t)
136 filter-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
137 }
138
139 # @FUNCTION: append-cppflags
140 # @USAGE: <flags>
141 # @DESCRIPTION:
142 # Add extra <flags> to the current CPPFLAGS.
143 append-cppflags() {
144 [[ $# -eq 0 ]] && return 0
145 export CPPFLAGS="${CPPFLAGS} $*"
146 return 0
147 }
148
149 # @FUNCTION: append-cflags
150 # @USAGE: <flags>
151 # @DESCRIPTION:
152 # Add extra <flags> to the current CFLAGS.
153 append-cflags() {
154 [[ $# -eq 0 ]] && return 0
155 export CFLAGS=$(test-flags-CC ${CFLAGS} "$@")
156 return 0
157 }
158
159 # @FUNCTION: append-cxxflags
160 # @USAGE: <flags>
161 # @DESCRIPTION:
162 # Add extra <flags> to the current CXXFLAGS.
163 append-cxxflags() {
164 [[ $# -eq 0 ]] && return 0
165 export CXXFLAGS=$(test-flags-CXX ${CXXFLAGS} "$@")
166 return 0
167 }
168
169 # @FUNCTION: append-fflags
170 # @USAGE: <flags>
171 # @DESCRIPTION:
172 # Add extra <flags> to the current {F,FC}FLAGS.
173 append-fflags() {
174 [[ $# -eq 0 ]] && return 0
175 export FFLAGS=$(test-flags-F77 ${FFLAGS} "$@")
176 export FCFLAGS=$(test-flags-FC ${FCFLAGS} "$@")
177 return 0
178 }
179
180 # @FUNCTION: append-lfs-flags
181 # @DESCRIPTION:
182 # Add flags that enable Large File Support.
183 append-lfs-flags() {
184 [[ $# -ne 0 ]] && die "append-lfs-flags takes no arguments"
185 # see comments in filter-lfs-flags func for meaning of these
186 append-cppflags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
187 }
188
189 # @FUNCTION: append-flags
190 # @USAGE: <flags>
191 # @DESCRIPTION:
192 # Add extra <flags> to your current {C,CXX,F,FC}FLAGS.
193 append-flags() {
194 [[ $# -eq 0 ]] && return 0
195 append-cflags "$@"
196 append-cxxflags "$@"
197 append-fflags "$@"
198 return 0
199 }
200
201 # @FUNCTION: replace-flags
202 # @USAGE: <old> <new>
203 # @DESCRIPTION:
204 # Replace the <old> flag with <new>. Accepts shell globs for <old>.
205 replace-flags() {
206 [[ $# != 2 ]] \
207 && echo && eerror "Usage: replace-flags <old flag> <new flag>" \
208 && die "replace-flags takes 2 arguments, not $#"
209
210 local f fset
211 declare -a new_CFLAGS new_CXXFLAGS new_FFLAGS new_FCFLAGS
212
213 for fset in CFLAGS CXXFLAGS FFLAGS FCFLAGS; do
214 # Looping over the flags instead of using a global
215 # substitution ensures that we're working with flag atoms.
216 # Otherwise globs like -O* have the potential to wipe out the
217 # list of flags.
218 for f in ${!fset}; do
219 # Note this should work with globs like -O*
220 [[ ${f} == ${1} ]] && f=${2}
221 eval new_${fset}\[\${\#new_${fset}\[@]}]=\${f}
222 done
223 eval export ${fset}=\${new_${fset}\[*]}
224 done
225
226 return 0
227 }
228
229 # @FUNCTION: replace-cpu-flags
230 # @USAGE: <old> <new>
231 # @DESCRIPTION:
232 # Replace cpu flags (like -march/-mcpu/-mtune) that select the <old> cpu
233 # with flags that select the <new> cpu. Accepts shell globs for <old>.
234 replace-cpu-flags() {
235 local newcpu="$#" ; newcpu="${!newcpu}"
236 while [ $# -gt 1 ] ; do
237 # quote to make sure that no globbing is done (particularly on
238 # ${oldcpu}) prior to calling replace-flags
239 replace-flags "-march=${1}" "-march=${newcpu}"
240 replace-flags "-mcpu=${1}" "-mcpu=${newcpu}"
241 replace-flags "-mtune=${1}" "-mtune=${newcpu}"
242 shift
243 done
244 return 0
245 }
246
247 _is_flagq() {
248 local x
249 for x in ${!1} ; do
250 [[ ${x} == $2 ]] && return 0
251 done
252 return 1
253 }
254
255 # @FUNCTION: is-flagq
256 # @USAGE: <flag>
257 # @DESCRIPTION:
258 # Returns shell true if <flag> is in {C,CXX,F,FC}FLAGS, else returns shell false. Accepts shell globs.
259 is-flagq() {
260 [[ -n $2 ]] && die "Usage: is-flag <flag>"
261 _is_flagq CFLAGS $1 || _is_flagq CXXFLAGS $1 || _is_flagq FFLAGS $1 || _is_flagq FCFLAGS $1
262 }
263
264 # @FUNCTION: is-flag
265 # @USAGE: <flag>
266 # @DESCRIPTION:
267 # Echo's "true" if flag is set in {C,CXX,F,FC}FLAGS. Accepts shell globs.
268 is-flag() {
269 is-flagq "$@" && echo true
270 }
271
272 # @FUNCTION: is-ldflagq
273 # @USAGE: <flag>
274 # @DESCRIPTION:
275 # Returns shell true if <flag> is in LDFLAGS, else returns shell false. Accepts shell globs.
276 is-ldflagq() {
277 [[ -n $2 ]] && die "Usage: is-ldflag <flag>"
278 _is_flagq LDFLAGS $1
279 }
280
281 # @FUNCTION: is-ldflag
282 # @USAGE: <flag>
283 # @DESCRIPTION:
284 # Echo's "true" if flag is set in LDFLAGS. Accepts shell globs.
285 is-ldflag() {
286 is-ldflagq "$@" && echo true
287 }
288
289 # @FUNCTION: filter-mfpmath
290 # @USAGE: <math types>
291 # @DESCRIPTION:
292 # Remove specified math types from the fpmath flag. For example, if the user
293 # has -mfpmath=sse,386, running `filter-mfpmath sse` will leave the user with
294 # -mfpmath=386.
295 filter-mfpmath() {
296 local orig_mfpmath new_math prune_math
297
298 # save the original -mfpmath flag
299 orig_mfpmath=$(get-flag -mfpmath)
300 # get the value of the current -mfpmath flag
301 new_math=$(get-flag mfpmath)
302 new_math=" ${new_math//,/ } "
303 # figure out which math values are to be removed
304 prune_math=""
305 for prune_math in "$@" ; do
306 new_math=${new_math/ ${prune_math} / }
307 done
308 new_math=$(echo ${new_math})
309 new_math=${new_math// /,}
310
311 if [[ -z ${new_math} ]] ; then
312 # if we're removing all user specified math values are
313 # slated for removal, then we just filter the flag
314 filter-flags ${orig_mfpmath}
315 else
316 # if we only want to filter some of the user specified
317 # math values, then we replace the current flag
318 replace-flags ${orig_mfpmath} -mfpmath=${new_math}
319 fi
320 return 0
321 }
322
323 # @FUNCTION: strip-flags
324 # @DESCRIPTION:
325 # Strip C[XX]FLAGS of everything except known good/safe flags.
326 strip-flags() {
327 local x y flag NEW_CFLAGS NEW_CXXFLAGS NEW_FFLAGS NEW_FCFLAGS
328
329 setup-allowed-flags
330
331 local NEW_CFLAGS=""
332 local NEW_CXXFLAGS=""
333 local NEW_FFLAGS=""
334 local NEW_FCFLAGS=""
335
336 set -f # disable pathname expansion
337
338 for x in ${CFLAGS}; do
339 for y in ${ALLOWED_FLAGS}; do
340 flag=${x%%=*}
341 if [ "${flag%%${y}}" = "" ] ; then
342 NEW_CFLAGS="${NEW_CFLAGS} ${x}"
343 break
344 fi
345 done
346 done
347
348 for x in ${CXXFLAGS}; do
349 for y in ${ALLOWED_FLAGS}; do
350 flag=${x%%=*}
351 if [ "${flag%%${y}}" = "" ] ; then
352 NEW_CXXFLAGS="${NEW_CXXFLAGS} ${x}"
353 break
354 fi
355 done
356 done
357
358 for x in ${FFLAGS}; do
359 for y in ${ALLOWED_FLAGS}; do
360 flag=${x%%=*}
361 if [ "${flag%%${y}}" = "" ] ; then
362 NEW_FFLAGS="${NEW_FFLAGS} ${x}"
363 break
364 fi
365 done
366 done
367
368 for x in ${FCFLAGS}; do
369 for y in ${ALLOWED_FLAGS}; do
370 flag=${x%%=*}
371 if [ "${flag%%${y}}" = "" ] ; then
372 NEW_FCFLAGS="${NEW_FCFLAGS} ${x}"
373 break
374 fi
375 done
376 done
377
378 # In case we filtered out all optimization flags fallback to -O2
379 if [ "${CFLAGS/-O}" != "${CFLAGS}" -a "${NEW_CFLAGS/-O}" = "${NEW_CFLAGS}" ]; then
380 NEW_CFLAGS="${NEW_CFLAGS} -O2"
381 fi
382 if [ "${CXXFLAGS/-O}" != "${CXXFLAGS}" -a "${NEW_CXXFLAGS/-O}" = "${NEW_CXXFLAGS}" ]; then
383 NEW_CXXFLAGS="${NEW_CXXFLAGS} -O2"
384 fi
385 if [ "${FFLAGS/-O}" != "${FFLAGS}" -a "${NEW_FFLAGS/-O}" = "${NEW_FFLAGS}" ]; then
386 NEW_FFLAGS="${NEW_FFLAGS} -O2"
387 fi
388 if [ "${FCFLAGS/-O}" != "${FCFLAGS}" -a "${NEW_FCFLAGS/-O}" = "${NEW_FCFLAGS}" ]; then
389 NEW_FCFLAGS="${NEW_FCFLAGS} -O2"
390 fi
391
392 set +f # re-enable pathname expansion
393
394 export CFLAGS="${NEW_CFLAGS}"
395 export CXXFLAGS="${NEW_CXXFLAGS}"
396 export FFLAGS="${NEW_FFLAGS}"
397 export FCFLAGS="${NEW_FCFLAGS}"
398 return 0
399 }
400
401 test-flag-PROG() {
402 local comp=$1
403 local flags="$2"
404
405 [[ -z ${comp} || -z ${flags} ]] && return 1
406
407 # use -c so we can test the assembler as well
408 local PROG=$(tc-get${comp})
409 ${PROG} ${flags} -c -o /dev/null -xc /dev/null \
410 > /dev/null 2>&1
411 }
412
413 # @FUNCTION: test-flag-CC
414 # @USAGE: <flag>
415 # @DESCRIPTION:
416 # Returns shell true if <flag> is supported by the C compiler, else returns shell false.
417 test-flag-CC() { test-flag-PROG "CC" "$1"; }
418
419 # @FUNCTION: test-flag-CXX
420 # @USAGE: <flag>
421 # @DESCRIPTION:
422 # Returns shell true if <flag> is supported by the C++ compiler, else returns shell false.
423 test-flag-CXX() { test-flag-PROG "CXX" "$1"; }
424
425 # @FUNCTION: test-flag-F77
426 # @USAGE: <flag>
427 # @DESCRIPTION:
428 # Returns shell true if <flag> is supported by the Fortran 77 compiler, else returns shell false.
429 test-flag-F77() { test-flag-PROG "F77" "$1"; }
430
431 # @FUNCTION: test-flag-FC
432 # @USAGE: <flag>
433 # @DESCRIPTION:
434 # Returns shell true if <flag> is supported by the Fortran 90 compiler, else returns shell false.
435 test-flag-FC() { test-flag-PROG "FC" "$1"; }
436
437 test-flags-PROG() {
438 local comp=$1
439 local flags
440 local x
441
442 shift
443
444 [[ -z ${comp} ]] && return 1
445
446 for x in "$@" ; do
447 test-flag-${comp} "${x}" && flags="${flags}${flags:+ }${x}"
448 done
449
450 echo "${flags}"
451
452 # Just bail if we dont have any flags
453 [[ -n ${flags} ]]
454 }
455
456 # @FUNCTION: test-flags-CC
457 # @USAGE: <flags>
458 # @DESCRIPTION:
459 # Returns shell true if <flags> are supported by the C compiler, else returns shell false.
460 test-flags-CC() { test-flags-PROG "CC" "$@"; }
461
462 # @FUNCTION: test-flags-CXX
463 # @USAGE: <flags>
464 # @DESCRIPTION:
465 # Returns shell true if <flags> are supported by the C++ compiler, else returns shell false.
466 test-flags-CXX() { test-flags-PROG "CXX" "$@"; }
467
468 # @FUNCTION: test-flags-F77
469 # @USAGE: <flags>
470 # @DESCRIPTION:
471 # Returns shell true if <flags> are supported by the Fortran 77 compiler, else returns shell false.
472 test-flags-F77() { test-flags-PROG "F77" "$@"; }
473
474 # @FUNCTION: test-flags-FC
475 # @USAGE: <flags>
476 # @DESCRIPTION:
477 # Returns shell true if <flags> are supported by the Fortran 90 compiler, else returns shell false.
478 test-flags-FC() { test-flags-PROG "FC" "$@"; }
479
480 # @FUNCTION: test-flags
481 # @USAGE: <flags>
482 # @DESCRIPTION:
483 # Short-hand that should hopefully work for both C and C++ compiler, but
484 # its really only present due to the append-flags() abomination.
485 test-flags() { test-flags-CC "$@"; }
486
487 # @FUNCTION: test_version_info
488 # @USAGE: <version>
489 # @DESCRIPTION:
490 # Returns shell true if the current C compiler version matches <version>, else returns shell false.
491 # Accepts shell globs.
492 test_version_info() {
493 if [[ $($(tc-getCC) --version 2>&1) == *$1* ]]; then
494 return 0
495 else
496 return 1
497 fi
498 }
499
500 # @FUNCTION: strip-unsupported-flags
501 # @DESCRIPTION:
502 # Strip {C,CXX,F,FC}FLAGS of any flags not supported by the active toolchain.
503 strip-unsupported-flags() {
504 export CFLAGS=$(test-flags-CC ${CFLAGS})
505 export CXXFLAGS=$(test-flags-CXX ${CXXFLAGS})
506 export FFLAGS=$(test-flags-F77 ${FFLAGS})
507 export FCFLAGS=$(test-flags-FC ${FCFLAGS})
508 }
509
510 # @FUNCTION: get-flag
511 # @USAGE: <flag>
512 # @DESCRIPTION:
513 # Find and echo the value for a particular flag. Accepts shell globs.
514 get-flag() {
515 local f findflag="$1"
516
517 # this code looks a little flaky but seems to work for
518 # everything we want ...
519 # for example, if CFLAGS="-march=i686":
520 # `get-flag -march` == "-march=i686"
521 # `get-flag march` == "i686"
522 for f in ${CFLAGS} ${CXXFLAGS} ${FFLAGS} ${FCFLAGS} ; do
523 if [ "${f/${findflag}}" != "${f}" ] ; then
524 printf "%s\n" "${f/-${findflag}=}"
525 return 0
526 fi
527 done
528 return 1
529 }
530
531 # DEAD FUNCS. Remove by Dec 2011.
532 test_flag() { die "$0: deprecated, please use test-flags()!" ; }
533 has_hardened() { die "$0: deprecated, please use gcc-specs-{relro,now}()!" ; }
534 has_pic() { die "$0: deprecated, please use gcc-specs-pie()!" ; }
535 has_pie() { die "$0: deprecated, please use gcc-specs-pie()!" ; }
536 has_ssp_all() { die "$0: deprecated, please use gcc-specs-ssp()!" ; }
537 has_ssp() { die "$0: deprecated, please use gcc-specs-ssp()!" ; }
538
539 # @FUNCTION: has_m64
540 # @DESCRIPTION:
541 # This doesn't test if the flag is accepted, it tests if the flag actually
542 # WORKS. Non-multilib gcc will take both -m32 and -m64. If the flag works
543 # return code is 0, else the return code is 1.
544 has_m64() {
545 # this doesnt test if the flag is accepted, it tests if the flag
546 # actually -WORKS-. non-multilib gcc will take both -m32 and -m64!
547 # please dont replace this function with test_flag in some future
548 # clean-up!
549
550 local temp="$(emktemp)"
551 echo "int main() { return(0); }" > "${temp}".c
552 MY_CC=$(tc-getCC)
553 ${MY_CC/ .*/} -m64 -o "$(emktemp)" "${temp}".c > /dev/null 2>&1
554 local ret=$?
555 rm -f "${temp}".c
556 [[ ${ret} != 1 ]] && return 0
557 return 1
558 }
559
560 # @FUNCTION: has_m32
561 # @DESCRIPTION:
562 # This doesn't test if the flag is accepted, it tests if the flag actually
563 # WORKS. Non-mulilib gcc will take both -m32 and -64. If the flag works return
564 # code is 0, else return code is 1.
565 has_m32() {
566 # this doesnt test if the flag is accepted, it tests if the flag
567 # actually -WORKS-. non-multilib gcc will take both -m32 and -m64!
568 # please dont replace this function with test_flag in some future
569 # clean-up!
570
571 [ "$(tc-arch)" = "amd64" ] && has_multilib_profile && return 0
572
573 local temp=$(emktemp)
574 echo "int main() { return(0); }" > "${temp}".c
575 MY_CC=$(tc-getCC)
576 ${MY_CC/ .*/} -m32 -o "$(emktemp)" "${temp}".c > /dev/null 2>&1
577 local ret=$?
578 rm -f "${temp}".c
579 [[ ${ret} != 1 ]] && return 0
580 return 1
581 }
582
583 # @FUNCTION: replace-sparc64-flags
584 # @DESCRIPTION:
585 # Sets mcpu to v8 and uses the original value as mtune if none specified.
586 replace-sparc64-flags() {
587 local SPARC64_CPUS="ultrasparc3 ultrasparc v9"
588
589 if [ "${CFLAGS/mtune}" != "${CFLAGS}" ]; then
590 for x in ${SPARC64_CPUS}; do
591 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8}"
592 done
593 else
594 for x in ${SPARC64_CPUS}; do
595 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
596 done
597 fi
598
599 if [ "${CXXFLAGS/mtune}" != "${CXXFLAGS}" ]; then
600 for x in ${SPARC64_CPUS}; do
601 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8}"
602 done
603 else
604 for x in ${SPARC64_CPUS}; do
605 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
606 done
607 fi
608
609 export CFLAGS CXXFLAGS
610 }
611
612 # @FUNCTION: append-libs
613 # @USAGE: <libs>
614 # @DESCRIPTION:
615 # Add extra <libs> to the current LIBS.
616 append-libs() {
617 [[ $# -eq 0 ]] && return 0
618 local flag
619 for flag in "$@"; do
620 [[ ${flag} == -l* ]] && flag=${flag#-l}
621 export LIBS="${LIBS} -l${flag}"
622 done
623
624 return 0
625 }
626
627 # @FUNCTION: append-ldflags
628 # @USAGE: <flags>
629 # @DESCRIPTION:
630 # Add extra <flags> to the current LDFLAGS.
631 append-ldflags() {
632 [[ $# -eq 0 ]] && return 0
633 local flag
634 for flag in "$@"; do
635 [[ ${flag} == -l* ]] && \
636 ewarn "Appending a library link instruction (${flag}); libraries to link to should not be passed through LDFLAGS"
637 done
638
639 export LDFLAGS="${LDFLAGS} $*"
640 return 0
641 }
642
643 # @FUNCTION: filter-ldflags
644 # @USAGE: <flags>
645 # @DESCRIPTION:
646 # Remove particular <flags> from LDFLAGS. Accepts shell globs.
647 filter-ldflags() {
648 _filter-var LDFLAGS "$@"
649 return 0
650 }
651
652 # @FUNCTION: raw-ldflags
653 # @USAGE: [flags]
654 # @DESCRIPTION:
655 # Turn C style ldflags (-Wl,-foo) into straight ldflags - the results
656 # are suitable for passing directly to 'ld'; note LDFLAGS is usually passed
657 # to gcc where it needs the '-Wl,'.
658 #
659 # If no flags are specified, then default to ${LDFLAGS}.
660 raw-ldflags() {
661 local x input="$@"
662 [[ -z ${input} ]] && input=${LDFLAGS}
663 set --
664 for x in ${input} ; do
665 x=${x#-Wl,}
666 set -- "$@" ${x//,/ }
667 done
668 echo "$@"
669 }
670
671 # @FUNCTION: no-as-needed
672 # @RETURN: Flag to disable asneeded behavior for use with append-ldflags.
673 no-as-needed() {
674 case $($(tc-getLD) -v 2>&1 </dev/null) in
675 *GNU*) # GNU ld
676 echo "-Wl,--no-as-needed" ;;
677 esac
678 }
679
680 fi

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