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Revision 1.162 - (show annotations) (download)
Wed Dec 28 05:48:28 2011 UTC (2 years, 11 months ago) by dirtyepic
Branch: MAIN
Changes since 1.161: +2 -10 lines
Remove UNSTABLE_FLAGS.  Keyword status should not determine what flags are used.  Move -Os to allowed flags as it's been stable since 4.0ish and drop -O0 because it breaks things a lot.

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 1.161 2011/12/15 05:23:15 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 ################ 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 if [[ -z ${ALLOWED_FLAGS} ]] ; then
36 export ALLOWED_FLAGS="-pipe"
37 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -O -O1 -O2 -Os -mcpu -march -mtune"
38 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -fstack-protector -fstack-protector-all"
39 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -fbounds-checking -fno-strict-overflow"
40 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -fno-PIE -fno-pie -fno-unit-at-a-time"
41 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -g -g[0-9] -ggdb -ggdb[0-9] -gstabs -gstabs+"
42 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -fno-ident -fpermissive"
43 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -W* -w"
44 fi
45 # allow a bunch of flags that negate features / control ABI
46 ALLOWED_FLAGS="${ALLOWED_FLAGS} -fno-stack-protector -fno-stack-protector-all \
47 -fno-strict-aliasing -fno-bounds-checking -fstrict-overflow -fno-omit-frame-pointer"
48 ALLOWED_FLAGS="${ALLOWED_FLAGS} -mregparm -mno-app-regs -mapp-regs \
49 -mno-mmx -mno-sse -mno-sse2 -mno-sse3 -mno-ssse3 -mno-sse4 -mno-sse4.1 \
50 -mno-sse4.2 -mno-avx -mno-aes -mno-pclmul -mno-sse4a -mno-3dnow \
51 -mno-popcnt -mno-abm \
52 -mips1 -mips2 -mips3 -mips4 -mips32 -mips64 -mips16 -mplt \
53 -msoft-float -mno-soft-float -mhard-float -mno-hard-float -mfpu \
54 -mieee -mieee-with-inexact -mschedule -mfloat-gprs -mspe -mno-spe \
55 -mtls-direct-seg-refs -mno-tls-direct-seg-refs \
56 -mflat -mno-flat -mno-faster-structs -mfaster-structs \
57 -m32 -m64 -mx32 -mabi -mlittle-endian -mbig-endian -EL -EB -fPIC \
58 -mlive-g0 -mcmodel -mstack-bias -mno-stack-bias \
59 -msecure-plt -m*-toc -D* -U*"
60
61 # 4.5
62 ALLOWED_FLAGS="${ALLOWED_FLAGS} -mno-fma4 -mno-movbe -mno-xop -mno-lwp"
63 # 4.6
64 ALLOWED_FLAGS="${ALLOWED_FLAGS} -mno-fsgsbase -mno-rdrnd -mno-f16c \
65 -mno-bmi -mno-tbm"
66
67 return 0
68 }
69
70 # inverted filters for hardened compiler. This is trying to unpick
71 # the hardened compiler defaults.
72 _filter-hardened() {
73 local f
74 for f in "$@" ; do
75 case "${f}" in
76 # Ideally we should only concern ourselves with PIE flags,
77 # not -fPIC or -fpic, but too many places filter -fPIC without
78 # thinking about -fPIE.
79 -fPIC|-fpic|-fPIE|-fpie|-Wl,pie|-pie)
80 gcc-specs-pie || continue
81 is-flagq -nopie || append-flags -nopie;;
82 -fstack-protector)
83 gcc-specs-ssp || continue
84 is-flagq -fno-stack-protector || append-flags $(test-flags -fno-stack-protector);;
85 -fstack-protector-all)
86 gcc-specs-ssp-to-all || continue
87 is-flagq -fno-stack-protector-all || append-flags $(test-flags -fno-stack-protector-all);;
88 -fno-strict-overflow)
89 gcc-specs-nostrict || continue
90 is-flagq -fstrict-overflow || append-flags $(test-flags -fstrict-overflow);;
91 esac
92 done
93 }
94
95 # Remove occurrences of strings from variable given in $1
96 # Strings removed are matched as globs, so for example
97 # '-O*' would remove -O1, -O2 etc.
98 _filter-var() {
99 local f x VAR VAL
100 declare -a new
101
102 VAR=$1
103 shift
104 eval VAL=\${${VAR}}
105 for f in ${VAL}; do
106 for x in "$@"; do
107 # Note this should work with globs like -O*
108 [[ ${f} == ${x} ]] && continue 2
109 done
110 eval new\[\${\#new\[@]}]=\${f}
111 done
112 eval export ${VAR}=\${new\[*]}
113 }
114
115 # @FUNCTION: filter-flags
116 # @USAGE: <flags>
117 # @DESCRIPTION:
118 # Remove particular <flags> from {C,CPP,CXX,F,FC}FLAGS. Accepts shell globs.
119 filter-flags() {
120 _filter-hardened "$@"
121 _filter-var CFLAGS "$@"
122 _filter-var CPPFLAGS "$@"
123 _filter-var CXXFLAGS "$@"
124 _filter-var FFLAGS "$@"
125 _filter-var FCFLAGS "$@"
126 return 0
127 }
128
129 # @FUNCTION: filter-lfs-flags
130 # @DESCRIPTION:
131 # Remove flags that enable Large File Support.
132 filter-lfs-flags() {
133 [[ $# -ne 0 ]] && die "filter-lfs-flags takes no arguments"
134 # http://www.gnu.org/s/libc/manual/html_node/Feature-Test-Macros.html
135 # _LARGEFILE_SOURCE: enable support for new LFS funcs (ftello/etc...)
136 # _LARGEFILE64_SOURCE: enable support for 64bit variants (off64_t/fseeko64/etc...)
137 # _FILE_OFFSET_BITS: default to 64bit variants (off_t is defined as off64_t)
138 filter-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
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-flags
192 # @USAGE: <flags>
193 # @DESCRIPTION:
194 # Add extra <flags> to your current {C,CXX,F,FC}FLAGS.
195 append-flags() {
196 [[ $# -eq 0 ]] && return 0
197 append-cflags "$@"
198 append-cxxflags "$@"
199 append-fflags "$@"
200 return 0
201 }
202
203 # @FUNCTION: replace-flags
204 # @USAGE: <old> <new>
205 # @DESCRIPTION:
206 # Replace the <old> flag with <new>. Accepts shell globs for <old>.
207 replace-flags() {
208 [[ $# != 2 ]] \
209 && echo && eerror "Usage: replace-flags <old flag> <new flag>" \
210 && die "replace-flags takes 2 arguments, not $#"
211
212 local f fset
213 declare -a new_CFLAGS new_CXXFLAGS new_FFLAGS new_FCFLAGS
214
215 for fset in CFLAGS CXXFLAGS FFLAGS FCFLAGS; do
216 # Looping over the flags instead of using a global
217 # substitution ensures that we're working with flag atoms.
218 # Otherwise globs like -O* have the potential to wipe out the
219 # list of flags.
220 for f in ${!fset}; do
221 # Note this should work with globs like -O*
222 [[ ${f} == ${1} ]] && f=${2}
223 eval new_${fset}\[\${\#new_${fset}\[@]}]=\${f}
224 done
225 eval export ${fset}=\${new_${fset}\[*]}
226 done
227
228 return 0
229 }
230
231 # @FUNCTION: replace-cpu-flags
232 # @USAGE: <old> <new>
233 # @DESCRIPTION:
234 # Replace cpu flags (like -march/-mcpu/-mtune) that select the <old> cpu
235 # with flags that select the <new> cpu. Accepts shell globs for <old>.
236 replace-cpu-flags() {
237 local newcpu="$#" ; newcpu="${!newcpu}"
238 while [ $# -gt 1 ] ; do
239 # quote to make sure that no globbing is done (particularly on
240 # ${oldcpu}) prior to calling replace-flags
241 replace-flags "-march=${1}" "-march=${newcpu}"
242 replace-flags "-mcpu=${1}" "-mcpu=${newcpu}"
243 replace-flags "-mtune=${1}" "-mtune=${newcpu}"
244 shift
245 done
246 return 0
247 }
248
249 _is_flagq() {
250 local x
251 for x in ${!1} ; do
252 [[ ${x} == $2 ]] && return 0
253 done
254 return 1
255 }
256
257 # @FUNCTION: is-flagq
258 # @USAGE: <flag>
259 # @DESCRIPTION:
260 # Returns shell true if <flag> is in {C,CXX,F,FC}FLAGS, else returns shell false. Accepts shell globs.
261 is-flagq() {
262 [[ -n $2 ]] && die "Usage: is-flag <flag>"
263 _is_flagq CFLAGS $1 || _is_flagq CXXFLAGS $1 || _is_flagq FFLAGS $1 || _is_flagq FCFLAGS $1
264 }
265
266 # @FUNCTION: is-flag
267 # @USAGE: <flag>
268 # @DESCRIPTION:
269 # Echo's "true" if flag is set in {C,CXX,F,FC}FLAGS. Accepts shell globs.
270 is-flag() {
271 is-flagq "$@" && echo true
272 }
273
274 # @FUNCTION: is-ldflagq
275 # @USAGE: <flag>
276 # @DESCRIPTION:
277 # Returns shell true if <flag> is in LDFLAGS, else returns shell false. Accepts shell globs.
278 is-ldflagq() {
279 [[ -n $2 ]] && die "Usage: is-ldflag <flag>"
280 _is_flagq LDFLAGS $1
281 }
282
283 # @FUNCTION: is-ldflag
284 # @USAGE: <flag>
285 # @DESCRIPTION:
286 # Echo's "true" if flag is set in LDFLAGS. Accepts shell globs.
287 is-ldflag() {
288 is-ldflagq "$@" && echo true
289 }
290
291 # @FUNCTION: filter-mfpmath
292 # @USAGE: <math types>
293 # @DESCRIPTION:
294 # Remove specified math types from the fpmath flag. For example, if the user
295 # has -mfpmath=sse,386, running `filter-mfpmath sse` will leave the user with
296 # -mfpmath=386.
297 filter-mfpmath() {
298 local orig_mfpmath new_math prune_math
299
300 # save the original -mfpmath flag
301 orig_mfpmath=$(get-flag -mfpmath)
302 # get the value of the current -mfpmath flag
303 new_math=$(get-flag mfpmath)
304 new_math=" ${new_math//,/ } "
305 # figure out which math values are to be removed
306 prune_math=""
307 for prune_math in "$@" ; do
308 new_math=${new_math/ ${prune_math} / }
309 done
310 new_math=$(echo ${new_math})
311 new_math=${new_math// /,}
312
313 if [[ -z ${new_math} ]] ; then
314 # if we're removing all user specified math values are
315 # slated for removal, then we just filter the flag
316 filter-flags ${orig_mfpmath}
317 else
318 # if we only want to filter some of the user specified
319 # math values, then we replace the current flag
320 replace-flags ${orig_mfpmath} -mfpmath=${new_math}
321 fi
322 return 0
323 }
324
325 # @FUNCTION: strip-flags
326 # @DESCRIPTION:
327 # Strip C[XX]FLAGS of everything except known good/safe flags.
328 strip-flags() {
329 local x y flag NEW_CFLAGS NEW_CXXFLAGS NEW_FFLAGS NEW_FCFLAGS
330
331 setup-allowed-flags
332
333 local NEW_CFLAGS=""
334 local NEW_CXXFLAGS=""
335 local NEW_FFLAGS=""
336 local NEW_FCFLAGS=""
337
338 set -f # disable pathname expansion
339
340 for x in ${CFLAGS}; do
341 for y in ${ALLOWED_FLAGS}; do
342 flag=${x%%=*}
343 if [ "${flag%%${y}}" = "" ] ; then
344 NEW_CFLAGS="${NEW_CFLAGS} ${x}"
345 break
346 fi
347 done
348 done
349
350 for x in ${CXXFLAGS}; do
351 for y in ${ALLOWED_FLAGS}; do
352 flag=${x%%=*}
353 if [ "${flag%%${y}}" = "" ] ; then
354 NEW_CXXFLAGS="${NEW_CXXFLAGS} ${x}"
355 break
356 fi
357 done
358 done
359
360 for x in ${FFLAGS}; do
361 for y in ${ALLOWED_FLAGS}; do
362 flag=${x%%=*}
363 if [ "${flag%%${y}}" = "" ] ; then
364 NEW_FFLAGS="${NEW_FFLAGS} ${x}"
365 break
366 fi
367 done
368 done
369
370 for x in ${FCFLAGS}; do
371 for y in ${ALLOWED_FLAGS}; do
372 flag=${x%%=*}
373 if [ "${flag%%${y}}" = "" ] ; then
374 NEW_FCFLAGS="${NEW_FCFLAGS} ${x}"
375 break
376 fi
377 done
378 done
379
380 # In case we filtered out all optimization flags fallback to -O2
381 if [ "${CFLAGS/-O}" != "${CFLAGS}" -a "${NEW_CFLAGS/-O}" = "${NEW_CFLAGS}" ]; then
382 NEW_CFLAGS="${NEW_CFLAGS} -O2"
383 fi
384 if [ "${CXXFLAGS/-O}" != "${CXXFLAGS}" -a "${NEW_CXXFLAGS/-O}" = "${NEW_CXXFLAGS}" ]; then
385 NEW_CXXFLAGS="${NEW_CXXFLAGS} -O2"
386 fi
387 if [ "${FFLAGS/-O}" != "${FFLAGS}" -a "${NEW_FFLAGS/-O}" = "${NEW_FFLAGS}" ]; then
388 NEW_FFLAGS="${NEW_FFLAGS} -O2"
389 fi
390 if [ "${FCFLAGS/-O}" != "${FCFLAGS}" -a "${NEW_FCFLAGS/-O}" = "${NEW_FCFLAGS}" ]; then
391 NEW_FCFLAGS="${NEW_FCFLAGS} -O2"
392 fi
393
394 set +f # re-enable pathname expansion
395
396 export CFLAGS="${NEW_CFLAGS}"
397 export CXXFLAGS="${NEW_CXXFLAGS}"
398 export FFLAGS="${NEW_FFLAGS}"
399 export FCFLAGS="${NEW_FCFLAGS}"
400 return 0
401 }
402
403 test-flag-PROG() {
404 local comp=$1
405 local flags="$2"
406
407 [[ -z ${comp} || -z ${flags} ]] && return 1
408
409 # use -c so we can test the assembler as well
410 local PROG=$(tc-get${comp})
411 ${PROG} ${flags} -c -o /dev/null -xc /dev/null \
412 > /dev/null 2>&1
413 }
414
415 # @FUNCTION: test-flag-CC
416 # @USAGE: <flag>
417 # @DESCRIPTION:
418 # Returns shell true if <flag> is supported by the C compiler, else returns shell false.
419 test-flag-CC() { test-flag-PROG "CC" "$1"; }
420
421 # @FUNCTION: test-flag-CXX
422 # @USAGE: <flag>
423 # @DESCRIPTION:
424 # Returns shell true if <flag> is supported by the C++ compiler, else returns shell false.
425 test-flag-CXX() { test-flag-PROG "CXX" "$1"; }
426
427 # @FUNCTION: test-flag-F77
428 # @USAGE: <flag>
429 # @DESCRIPTION:
430 # Returns shell true if <flag> is supported by the Fortran 77 compiler, else returns shell false.
431 test-flag-F77() { test-flag-PROG "F77" "$1"; }
432
433 # @FUNCTION: test-flag-FC
434 # @USAGE: <flag>
435 # @DESCRIPTION:
436 # Returns shell true if <flag> is supported by the Fortran 90 compiler, else returns shell false.
437 test-flag-FC() { test-flag-PROG "FC" "$1"; }
438
439 test-flags-PROG() {
440 local comp=$1
441 local flags
442 local x
443
444 shift
445
446 [[ -z ${comp} ]] && return 1
447
448 for x in "$@" ; do
449 test-flag-${comp} "${x}" && flags="${flags}${flags:+ }${x}"
450 done
451
452 echo "${flags}"
453
454 # Just bail if we dont have any flags
455 [[ -n ${flags} ]]
456 }
457
458 # @FUNCTION: test-flags-CC
459 # @USAGE: <flags>
460 # @DESCRIPTION:
461 # Returns shell true if <flags> are supported by the C compiler, else returns shell false.
462 test-flags-CC() { test-flags-PROG "CC" "$@"; }
463
464 # @FUNCTION: test-flags-CXX
465 # @USAGE: <flags>
466 # @DESCRIPTION:
467 # Returns shell true if <flags> are supported by the C++ compiler, else returns shell false.
468 test-flags-CXX() { test-flags-PROG "CXX" "$@"; }
469
470 # @FUNCTION: test-flags-F77
471 # @USAGE: <flags>
472 # @DESCRIPTION:
473 # Returns shell true if <flags> are supported by the Fortran 77 compiler, else returns shell false.
474 test-flags-F77() { test-flags-PROG "F77" "$@"; }
475
476 # @FUNCTION: test-flags-FC
477 # @USAGE: <flags>
478 # @DESCRIPTION:
479 # Returns shell true if <flags> are supported by the Fortran 90 compiler, else returns shell false.
480 test-flags-FC() { test-flags-PROG "FC" "$@"; }
481
482 # @FUNCTION: test-flags
483 # @USAGE: <flags>
484 # @DESCRIPTION:
485 # Short-hand that should hopefully work for both C and C++ compiler, but
486 # its really only present due to the append-flags() abomination.
487 test-flags() { test-flags-CC "$@"; }
488
489 # @FUNCTION: test_version_info
490 # @USAGE: <version>
491 # @DESCRIPTION:
492 # Returns shell true if the current C compiler version matches <version>, else returns shell false.
493 # Accepts shell globs.
494 test_version_info() {
495 if [[ $($(tc-getCC) --version 2>&1) == *$1* ]]; then
496 return 0
497 else
498 return 1
499 fi
500 }
501
502 # @FUNCTION: strip-unsupported-flags
503 # @DESCRIPTION:
504 # Strip {C,CXX,F,FC}FLAGS of any flags not supported by the active toolchain.
505 strip-unsupported-flags() {
506 export CFLAGS=$(test-flags-CC ${CFLAGS})
507 export CXXFLAGS=$(test-flags-CXX ${CXXFLAGS})
508 export FFLAGS=$(test-flags-F77 ${FFLAGS})
509 export FCFLAGS=$(test-flags-FC ${FCFLAGS})
510 }
511
512 # @FUNCTION: get-flag
513 # @USAGE: <flag>
514 # @DESCRIPTION:
515 # Find and echo the value for a particular flag. Accepts shell globs.
516 get-flag() {
517 local f findflag="$1"
518
519 # this code looks a little flaky but seems to work for
520 # everything we want ...
521 # for example, if CFLAGS="-march=i686":
522 # `get-flag -march` == "-march=i686"
523 # `get-flag march` == "i686"
524 for f in ${CFLAGS} ${CXXFLAGS} ${FFLAGS} ${FCFLAGS} ; do
525 if [ "${f/${findflag}}" != "${f}" ] ; then
526 printf "%s\n" "${f/-${findflag}=}"
527 return 0
528 fi
529 done
530 return 1
531 }
532
533 # DEAD FUNCS. Remove by Dec 2011.
534 test_flag() { die "$0: deprecated, please use test-flags()!" ; }
535 has_hardened() { die "$0: deprecated, please use gcc-specs-{relro,now}()!" ; }
536 has_pic() { die "$0: deprecated, please use gcc-specs-pie()!" ; }
537 has_pie() { die "$0: deprecated, please use gcc-specs-pie()!" ; }
538 has_ssp_all() { die "$0: deprecated, please use gcc-specs-ssp()!" ; }
539 has_ssp() { die "$0: deprecated, please use gcc-specs-ssp()!" ; }
540
541 # @FUNCTION: has_m64
542 # @DESCRIPTION:
543 # This doesn't test if the flag is accepted, it tests if the flag actually
544 # WORKS. Non-multilib gcc will take both -m32 and -m64. If the flag works
545 # return code is 0, else the return code is 1.
546 has_m64() {
547 # this doesnt test if the flag is accepted, it tests if the flag
548 # actually -WORKS-. non-multilib gcc will take both -m32 and -m64!
549 # please dont replace this function with test_flag in some future
550 # clean-up!
551
552 local temp="$(emktemp)"
553 echo "int main() { return(0); }" > "${temp}".c
554 MY_CC=$(tc-getCC)
555 ${MY_CC/ .*/} -m64 -o "$(emktemp)" "${temp}".c > /dev/null 2>&1
556 local ret=$?
557 rm -f "${temp}".c
558 [[ ${ret} != 1 ]] && return 0
559 return 1
560 }
561
562 # @FUNCTION: has_m32
563 # @DESCRIPTION:
564 # This doesn't test if the flag is accepted, it tests if the flag actually
565 # WORKS. Non-mulilib gcc will take both -m32 and -64. If the flag works return
566 # code is 0, else return code is 1.
567 has_m32() {
568 # this doesnt test if the flag is accepted, it tests if the flag
569 # actually -WORKS-. non-multilib gcc will take both -m32 and -m64!
570 # please dont replace this function with test_flag in some future
571 # clean-up!
572
573 [ "$(tc-arch)" = "amd64" ] && has_multilib_profile && return 0
574
575 local temp=$(emktemp)
576 echo "int main() { return(0); }" > "${temp}".c
577 MY_CC=$(tc-getCC)
578 ${MY_CC/ .*/} -m32 -o "$(emktemp)" "${temp}".c > /dev/null 2>&1
579 local ret=$?
580 rm -f "${temp}".c
581 [[ ${ret} != 1 ]] && return 0
582 return 1
583 }
584
585 # @FUNCTION: replace-sparc64-flags
586 # @DESCRIPTION:
587 # Sets mcpu to v8 and uses the original value as mtune if none specified.
588 replace-sparc64-flags() {
589 local SPARC64_CPUS="ultrasparc3 ultrasparc v9"
590
591 if [ "${CFLAGS/mtune}" != "${CFLAGS}" ]; then
592 for x in ${SPARC64_CPUS}; do
593 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8}"
594 done
595 else
596 for x in ${SPARC64_CPUS}; do
597 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
598 done
599 fi
600
601 if [ "${CXXFLAGS/mtune}" != "${CXXFLAGS}" ]; then
602 for x in ${SPARC64_CPUS}; do
603 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8}"
604 done
605 else
606 for x in ${SPARC64_CPUS}; do
607 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
608 done
609 fi
610
611 export CFLAGS CXXFLAGS
612 }
613
614 # @FUNCTION: append-libs
615 # @USAGE: <libs>
616 # @DESCRIPTION:
617 # Add extra <libs> to the current LIBS.
618 append-libs() {
619 [[ $# -eq 0 ]] && return 0
620 local flag
621 for flag in "$@"; do
622 [[ ${flag} == -l* ]] && flag=${flag#-l}
623 export LIBS="${LIBS} -l${flag}"
624 done
625
626 return 0
627 }
628
629 # @FUNCTION: append-ldflags
630 # @USAGE: <flags>
631 # @DESCRIPTION:
632 # Add extra <flags> to the current LDFLAGS.
633 append-ldflags() {
634 [[ $# -eq 0 ]] && return 0
635 local flag
636 for flag in "$@"; do
637 [[ ${flag} == -l* ]] && \
638 ewarn "Appending a library link instruction (${flag}); libraries to link to should not be passed through LDFLAGS"
639 done
640
641 export LDFLAGS="${LDFLAGS} $*"
642 return 0
643 }
644
645 # @FUNCTION: filter-ldflags
646 # @USAGE: <flags>
647 # @DESCRIPTION:
648 # Remove particular <flags> from LDFLAGS. Accepts shell globs.
649 filter-ldflags() {
650 _filter-var LDFLAGS "$@"
651 return 0
652 }
653
654 # @FUNCTION: raw-ldflags
655 # @USAGE: [flags]
656 # @DESCRIPTION:
657 # Turn C style ldflags (-Wl,-foo) into straight ldflags - the results
658 # are suitable for passing directly to 'ld'; note LDFLAGS is usually passed
659 # to gcc where it needs the '-Wl,'.
660 #
661 # If no flags are specified, then default to ${LDFLAGS}.
662 raw-ldflags() {
663 local x input="$@"
664 [[ -z ${input} ]] && input=${LDFLAGS}
665 set --
666 for x in ${input} ; do
667 x=${x#-Wl,}
668 set -- "$@" ${x//,/ }
669 done
670 echo "$@"
671 }
672
673 # @FUNCTION: no-as-needed
674 # @RETURN: Flag to disable asneeded behavior for use with append-ldflags.
675 no-as-needed() {
676 case $($(tc-getLD) -v 2>&1 </dev/null) in
677 *GNU*) # GNU ld
678 echo "-Wl,--no-as-needed" ;;
679 esac
680 }
681
682 fi

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