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Revision 1.156 - (show annotations) (download)
Sat Oct 8 18:37:30 2011 UTC (3 years, 1 month ago) by vapier
Branch: MAIN
Changes since 1.155: +4 -2 lines
document optional args to raw-ldflags

1 # Copyright 1999-2009 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 1.155 2011/08/17 18:20:59 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 inherit eutils toolchain-funcs multilib
14
15 ################ DEPRECATED functions ################
16 # The following are still present to avoid breaking existing
17 # code more than necessary; however they are deprecated. Please
18 # use gcc-specs-* from toolchain-funcs.eclass instead, if you
19 # need to know which hardened techs are active in the compiler.
20 # See bug #100974
21 #
22 # has_hardened
23 # has_pie
24 # has_pic
25 # has_ssp_all
26 # has_ssp
27
28
29 # {C,CXX,F,FC}FLAGS that we allow in strip-flags
30 # Note: shell globs and character lists are allowed
31 setup-allowed-flags() {
32 if [[ -z ${ALLOWED_FLAGS} ]] ; then
33 export ALLOWED_FLAGS="-pipe"
34 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -O -O0 -O1 -O2 -mcpu -march -mtune"
35 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -fstack-protector -fstack-protector-all"
36 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -fbounds-checking -fno-strict-overflow"
37 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -fno-PIE -fno-pie -fno-unit-at-a-time"
38 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -g -g[0-9] -ggdb -ggdb[0-9] -gstabs -gstabs+"
39 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -fno-ident -fpermissive"
40 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -W* -w"
41 fi
42 # allow a bunch of flags that negate features / control ABI
43 ALLOWED_FLAGS="${ALLOWED_FLAGS} -fno-stack-protector -fno-stack-protector-all \
44 -fno-strict-aliasing -fno-bounds-checking -fstrict-overflow -fno-omit-frame-pointer"
45 ALLOWED_FLAGS="${ALLOWED_FLAGS} -mregparm -mno-app-regs -mapp-regs \
46 -mno-mmx -mno-sse -mno-sse2 -mno-sse3 -mno-ssse3 -mno-sse4 -mno-sse4.1 \
47 -mno-sse4.2 -mno-avx -mno-aes -mno-pclmul -mno-sse4a -mno-3dnow \
48 -mno-popcnt -mno-abm \
49 -mips1 -mips2 -mips3 -mips4 -mips32 -mips64 -mips16 -mplt \
50 -msoft-float -mno-soft-float -mhard-float -mno-hard-float -mfpu \
51 -mieee -mieee-with-inexact -mschedule -mfloat-gprs -mspe -mno-spe \
52 -mtls-direct-seg-refs -mno-tls-direct-seg-refs \
53 -mflat -mno-flat -mno-faster-structs -mfaster-structs \
54 -m32 -m64 -mabi -mlittle-endian -mbig-endian -EL -EB -fPIC \
55 -mlive-g0 -mcmodel -mstack-bias -mno-stack-bias \
56 -msecure-plt -m*-toc -D* -U*"
57
58 # 4.5
59 ALLOWED_FLAGS="${ALLOWED_FLAGS} -mno-fma4 -mno-movbe -mno-xop -mno-lwp"
60 # 4.6
61 ALLOWED_FLAGS="${ALLOWED_FLAGS} -mno-fsgsbase -mno-rdrnd -mno-f16c \
62 -mno-bmi -mno-tbm"
63
64 # {C,CXX,F,FC}FLAGS that we are think is ok, but needs testing
65 # NOTE: currently -Os have issues with gcc3 and K6* arch's
66 export UNSTABLE_FLAGS="-Os -O3 -freorder-blocks"
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 [[ -z $* ]] && return 0
147 export CPPFLAGS="${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 [[ -z $* ]] && return 0
157 export CFLAGS="${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 [[ -z $* ]] && return 0
167 export CXXFLAGS="${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 [[ -z $* ]] && return 0
177 export FFLAGS="${FFLAGS} $*"
178 export FCFLAGS="${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 [[ -z $* ]] && return 0
197 append-cflags "$@"
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 # Allow unstable C[XX]FLAGS if we are using unstable profile ...
339 if has "~$(tc-arch)" ${ACCEPT_KEYWORDS} ; then
340 ALLOWED_FLAGS="${ALLOWED_FLAGS} ${UNSTABLE_FLAGS}"
341 fi
342
343 set -f # disable pathname expansion
344
345 for x in ${CFLAGS}; do
346 for y in ${ALLOWED_FLAGS}; do
347 flag=${x%%=*}
348 if [ "${flag%%${y}}" = "" ] ; then
349 NEW_CFLAGS="${NEW_CFLAGS} ${x}"
350 break
351 fi
352 done
353 done
354
355 for x in ${CXXFLAGS}; do
356 for y in ${ALLOWED_FLAGS}; do
357 flag=${x%%=*}
358 if [ "${flag%%${y}}" = "" ] ; then
359 NEW_CXXFLAGS="${NEW_CXXFLAGS} ${x}"
360 break
361 fi
362 done
363 done
364
365 for x in ${FFLAGS}; do
366 for y in ${ALLOWED_FLAGS}; do
367 flag=${x%%=*}
368 if [ "${flag%%${y}}" = "" ] ; then
369 NEW_FFLAGS="${NEW_FFLAGS} ${x}"
370 break
371 fi
372 done
373 done
374
375 for x in ${FCFLAGS}; do
376 for y in ${ALLOWED_FLAGS}; do
377 flag=${x%%=*}
378 if [ "${flag%%${y}}" = "" ] ; then
379 NEW_FCFLAGS="${NEW_FCFLAGS} ${x}"
380 break
381 fi
382 done
383 done
384
385 # In case we filtered out all optimization flags fallback to -O2
386 if [ "${CFLAGS/-O}" != "${CFLAGS}" -a "${NEW_CFLAGS/-O}" = "${NEW_CFLAGS}" ]; then
387 NEW_CFLAGS="${NEW_CFLAGS} -O2"
388 fi
389 if [ "${CXXFLAGS/-O}" != "${CXXFLAGS}" -a "${NEW_CXXFLAGS/-O}" = "${NEW_CXXFLAGS}" ]; then
390 NEW_CXXFLAGS="${NEW_CXXFLAGS} -O2"
391 fi
392 if [ "${FFLAGS/-O}" != "${FFLAGS}" -a "${NEW_FFLAGS/-O}" = "${NEW_FFLAGS}" ]; then
393 NEW_FFLAGS="${NEW_FFLAGS} -O2"
394 fi
395 if [ "${FCFLAGS/-O}" != "${FCFLAGS}" -a "${NEW_FCFLAGS/-O}" = "${NEW_FCFLAGS}" ]; then
396 NEW_FCFLAGS="${NEW_FCFLAGS} -O2"
397 fi
398
399 set +f # re-enable pathname expansion
400
401 export CFLAGS="${NEW_CFLAGS}"
402 export CXXFLAGS="${NEW_CXXFLAGS}"
403 export FFLAGS="${NEW_FFLAGS}"
404 export FCFLAGS="${NEW_FCFLAGS}"
405 return 0
406 }
407
408 test-flag-PROG() {
409 local comp=$1
410 local flags="$2"
411
412 [[ -z ${comp} || -z ${flags} ]] && return 1
413
414 # use -c so we can test the assembler as well
415 local PROG=$(tc-get${comp})
416 ${PROG} ${flags} -c -o /dev/null -xc /dev/null \
417 > /dev/null 2>&1
418 }
419
420 # @FUNCTION: test-flag-CC
421 # @USAGE: <flag>
422 # @DESCRIPTION:
423 # Returns shell true if <flag> is supported by the C compiler, else returns shell false.
424 test-flag-CC() { test-flag-PROG "CC" "$1"; }
425
426 # @FUNCTION: test-flag-CXX
427 # @USAGE: <flag>
428 # @DESCRIPTION:
429 # Returns shell true if <flag> is supported by the C++ compiler, else returns shell false.
430 test-flag-CXX() { test-flag-PROG "CXX" "$1"; }
431
432 # @FUNCTION: test-flag-F77
433 # @USAGE: <flag>
434 # @DESCRIPTION:
435 # Returns shell true if <flag> is supported by the Fortran 77 compiler, else returns shell false.
436 test-flag-F77() { test-flag-PROG "F77" "$1"; }
437
438 # @FUNCTION: test-flag-FC
439 # @USAGE: <flag>
440 # @DESCRIPTION:
441 # Returns shell true if <flag> is supported by the Fortran 90 compiler, else returns shell false.
442 test-flag-FC() { test-flag-PROG "FC" "$1"; }
443
444 test-flags-PROG() {
445 local comp=$1
446 local flags
447 local x
448
449 shift
450
451 [[ -z ${comp} ]] && return 1
452
453 x=""
454 for x in "$@" ; do
455 test-flag-${comp} "${x}" && flags="${flags}${flags:+ }${x}"
456 done
457
458 echo "${flags}"
459
460 # Just bail if we dont have any flags
461 [[ -n ${flags} ]]
462 }
463
464 # @FUNCTION: test-flags-CC
465 # @USAGE: <flags>
466 # @DESCRIPTION:
467 # Returns shell true if <flags> are supported by the C compiler, else returns shell false.
468 test-flags-CC() { test-flags-PROG "CC" "$@"; }
469
470 # @FUNCTION: test-flags-CXX
471 # @USAGE: <flags>
472 # @DESCRIPTION:
473 # Returns shell true if <flags> are supported by the C++ compiler, else returns shell false.
474 test-flags-CXX() { test-flags-PROG "CXX" "$@"; }
475
476 # @FUNCTION: test-flags-F77
477 # @USAGE: <flags>
478 # @DESCRIPTION:
479 # Returns shell true if <flags> are supported by the Fortran 77 compiler, else returns shell false.
480 test-flags-F77() { test-flags-PROG "F77" "$@"; }
481
482 # @FUNCTION: test-flags-FC
483 # @USAGE: <flags>
484 # @DESCRIPTION:
485 # Returns shell true if <flags> are supported by the Fortran 90 compiler, else returns shell false.
486 test-flags-FC() { test-flags-PROG "FC" "$@"; }
487
488 # @FUNCTION: test-flags
489 # @USAGE: <flags>
490 # @DESCRIPTION:
491 # Short-hand that should hopefully work for both C and C++ compiler, but
492 # its really only present due to the append-flags() abomination.
493 test-flags() { test-flags-CC "$@"; }
494
495 # @FUNCTION: test_version_info
496 # @USAGE: <version>
497 # @DESCRIPTION:
498 # Returns shell true if the current C compiler version matches <version>, else returns shell false.
499 # Accepts shell globs.
500 test_version_info() {
501 if [[ $($(tc-getCC) --version 2>&1) == *$1* ]]; then
502 return 0
503 else
504 return 1
505 fi
506 }
507
508 # @FUNCTION: strip-unsupported-flags
509 # @DESCRIPTION:
510 # Strip {C,CXX,F,FC}FLAGS of any flags not supported by the active toolchain.
511 strip-unsupported-flags() {
512 export CFLAGS=$(test-flags-CC ${CFLAGS})
513 export CXXFLAGS=$(test-flags-CXX ${CXXFLAGS})
514 export FFLAGS=$(test-flags-F77 ${FFLAGS})
515 export FCFLAGS=$(test-flags-FC ${FCFLAGS})
516 }
517
518 # @FUNCTION: get-flag
519 # @USAGE: <flag>
520 # @DESCRIPTION:
521 # Find and echo the value for a particular flag. Accepts shell globs.
522 get-flag() {
523 local f findflag="$1"
524
525 # this code looks a little flaky but seems to work for
526 # everything we want ...
527 # for example, if CFLAGS="-march=i686":
528 # `get-flag -march` == "-march=i686"
529 # `get-flag march` == "i686"
530 for f in ${CFLAGS} ${CXXFLAGS} ${FFLAGS} ${FCFLAGS} ; do
531 if [ "${f/${findflag}}" != "${f}" ] ; then
532 printf "%s\n" "${f/-${findflag}=}"
533 return 0
534 fi
535 done
536 return 1
537 }
538
539 # DEAD FUNCS. Remove by Dec 2011.
540 test_flag() { die "$0: deprecated, please use test-flags()!" ; }
541 has_hardened() { die "$0: deprecated, please use gcc-specs-{relro,now}()!" ; }
542 has_pic() { die "$0: deprecated, please use gcc-specs-pie()!" ; }
543 has_pie() { die "$0: deprecated, please use gcc-specs-pie()!" ; }
544 has_ssp_all() { die "$0: deprecated, please use gcc-specs-ssp()!" ; }
545 has_ssp() { die "$0: deprecated, please use gcc-specs-ssp()!" ; }
546
547 # @FUNCTION: has_m64
548 # @DESCRIPTION:
549 # This doesn't test if the flag is accepted, it tests if the flag actually
550 # WORKS. Non-multilib gcc will take both -m32 and -m64. If the flag works
551 # return code is 0, else the return code is 1.
552 has_m64() {
553 # this doesnt test if the flag is accepted, it tests if the flag
554 # actually -WORKS-. non-multilib gcc will take both -m32 and -m64!
555 # please dont replace this function with test_flag in some future
556 # clean-up!
557
558 local temp="$(emktemp)"
559 echo "int main() { return(0); }" > "${temp}".c
560 MY_CC=$(tc-getCC)
561 ${MY_CC/ .*/} -m64 -o "$(emktemp)" "${temp}".c > /dev/null 2>&1
562 local ret=$?
563 rm -f "${temp}".c
564 [[ ${ret} != 1 ]] && return 0
565 return 1
566 }
567
568 # @FUNCTION: has_m32
569 # @DESCRIPTION:
570 # This doesn't test if the flag is accepted, it tests if the flag actually
571 # WORKS. Non-mulilib gcc will take both -m32 and -64. If the flag works return
572 # code is 0, else return code is 1.
573 has_m32() {
574 # this doesnt test if the flag is accepted, it tests if the flag
575 # actually -WORKS-. non-multilib gcc will take both -m32 and -m64!
576 # please dont replace this function with test_flag in some future
577 # clean-up!
578
579 [ "$(tc-arch)" = "amd64" ] && has_multilib_profile && return 0
580
581 local temp=$(emktemp)
582 echo "int main() { return(0); }" > "${temp}".c
583 MY_CC=$(tc-getCC)
584 ${MY_CC/ .*/} -m32 -o "$(emktemp)" "${temp}".c > /dev/null 2>&1
585 local ret=$?
586 rm -f "${temp}".c
587 [[ ${ret} != 1 ]] && return 0
588 return 1
589 }
590
591 # @FUNCTION: replace-sparc64-flags
592 # @DESCRIPTION:
593 # Sets mcpu to v8 and uses the original value as mtune if none specified.
594 replace-sparc64-flags() {
595 local SPARC64_CPUS="ultrasparc3 ultrasparc v9"
596
597 if [ "${CFLAGS/mtune}" != "${CFLAGS}" ]; then
598 for x in ${SPARC64_CPUS}; do
599 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8}"
600 done
601 else
602 for x in ${SPARC64_CPUS}; do
603 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
604 done
605 fi
606
607 if [ "${CXXFLAGS/mtune}" != "${CXXFLAGS}" ]; then
608 for x in ${SPARC64_CPUS}; do
609 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8}"
610 done
611 else
612 for x in ${SPARC64_CPUS}; do
613 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
614 done
615 fi
616
617 export CFLAGS CXXFLAGS
618 }
619
620 # @FUNCTION: append-libs
621 # @USAGE: <libs>
622 # @DESCRIPTION:
623 # Add extra <libs> to the current LIBS.
624 append-libs() {
625 [[ -z $* ]] && return 0
626 local flag
627 for flag in "$@"; do
628 [[ ${flag} == -l* ]] && flag=${flag#-l}
629 export LIBS="${LIBS} -l${flag}"
630 done
631
632 return 0
633 }
634
635 # @FUNCTION: append-ldflags
636 # @USAGE: <flags>
637 # @DESCRIPTION:
638 # Add extra <flags> to the current LDFLAGS.
639 append-ldflags() {
640 [[ -z $* ]] && return 0
641 local flag
642 for flag in "$@"; do
643 [[ ${flag} == -l* ]] && \
644 ewarn "Appending a library link instruction (${flag}); libraries to link to should not be passed through LDFLAGS"
645 done
646
647 export LDFLAGS="${LDFLAGS} $*"
648 return 0
649 }
650
651 # @FUNCTION: filter-ldflags
652 # @USAGE: <flags>
653 # @DESCRIPTION:
654 # Remove particular <flags> from LDFLAGS. Accepts shell globs.
655 filter-ldflags() {
656 _filter-var LDFLAGS "$@"
657 return 0
658 }
659
660 # @FUNCTION: raw-ldflags
661 # @USAGE: [flags]
662 # @DESCRIPTION:
663 # Turn C style ldflags (-Wl,-foo) into straight ldflags - the results
664 # are suitable for passing directly to 'ld'; note LDFLAGS is usually passed
665 # to gcc where it needs the '-Wl,'.
666 #
667 # If no flags are specified, then default to ${LDFLAGS}.
668 raw-ldflags() {
669 local x input="$@"
670 [[ -z ${input} ]] && input=${LDFLAGS}
671 set --
672 for x in ${input} ; do
673 x=${x#-Wl,}
674 set -- "$@" ${x//,/ }
675 done
676 echo "$@"
677 }
678
679 # @FUNCTION: no-as-needed
680 # @RETURN: Flag to disable asneeded behavior for use with append-ldflags.
681 no-as-needed() {
682 case $($(tc-getLD) -v 2>&1 </dev/null) in
683 *GNU*) # GNU ld
684 echo "-Wl,--no-as-needed" ;;
685 esac
686 }
687
688 # Some tests for when we screw with things and want to make
689 # sure we didn't break anything
690 #TESTS() {
691 # CFLAGS="-a -b -c=1"
692 # CXXFLAGS="-x -y -z=2"
693 # LDFLAGS="-l -m -n=3"
694 #
695 # die() { exit 1; }
696 # (is-flag 1 2 3) && die
697 # (is-ldflag 1 2 3) && die
698 #
699 # is-flagq -l && die
700 # is-ldflagq -a && die
701 # is-flagq -a || die
702 # is-flagq -x || die
703 # is-ldflagq -n=* || die
704 # is-ldflagq -n && die
705 #
706 # strip-unsupported-flags
707 # [[ ${CFLAGS} == "-c=1" ]] || die
708 # [[ ${CXXFLAGS} == "-y -z=2" ]] || die
709 #
710 # echo "All tests pass"
711 #}
712 #TESTS

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