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Revision 1.127 - (show annotations) (download)
Sun Dec 21 21:40:49 2008 UTC (5 years, 11 months ago) by solar
Branch: MAIN
Changes since 1.126: +4 -4 lines
gcc emits -fstrict-overflow on '>gcc-4.2' need to be able to disable that and pass -U to undefine bad defines - http://gcc.gnu.org/gcc-4.2/changes.html

1 # Copyright 1999-2008 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 1.126 2008/11/03 05:52:39 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="${ALLOWED_FLAGS} -fno-ident"
40 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -W* -w"
41 fi
42 # allow a bunch of flags that negate features / control ABI
43 ALLOWED_FLAGS="${ALLOWED_FLAGS} -fno-stack-protector -fno-stack-protector-all \
44 -fno-strict-aliasing -fno-bounds-checking -fstrict-overflow"
45 ALLOWED_FLAGS="${ALLOWED_FLAGS} -mregparm -mno-app-regs -mapp-regs \
46 -mno-mmx -mno-sse -mno-sse2 -mno-sse3 -mno-3dnow \
47 -mips1 -mips2 -mips3 -mips4 -mips32 -mips64 -mips16 \
48 -msoft-float -mno-soft-float -mhard-float -mno-hard-float -mfpu \
49 -mieee -mieee-with-inexact -mschedule \
50 -mtls-direct-seg-refs -mno-tls-direct-seg-refs \
51 -mflat -mno-flat -mno-faster-structs -mfaster-structs \
52 -m32 -m64 -mabi -mlittle-endian -mbig-endian -EL -EB -fPIC \
53 -mlive-g0 -mcmodel -mstack-bias -mno-stack-bias \
54 -msecure-plt -m*-toc -D* -U*"
55
56 # {C,CXX,F,FC}FLAGS that we are think is ok, but needs testing
57 # NOTE: currently -Os have issues with gcc3 and K6* arch's
58 export UNSTABLE_FLAGS="-Os -O3 -freorder-blocks"
59 return 0
60 }
61
62 # inverted filters for hardened compiler. This is trying to unpick
63 # the hardened compiler defaults.
64 _filter-hardened() {
65 local f
66 for f in "$@" ; do
67 case "${f}" in
68 # Ideally we should only concern ourselves with PIE flags,
69 # not -fPIC or -fpic, but too many places filter -fPIC without
70 # thinking about -fPIE.
71 -fPIC|-fpic|-fPIE|-fpie|-Wl,pie|-pie)
72 gcc-specs-pie || continue
73 is-flagq -nopie || append-flags -nopie;;
74 -fstack-protector)
75 gcc-specs-ssp || continue
76 is-flagq -fno-stack-protector || append-flags -fno-stack-protector;;
77 -fstack-protector-all)
78 gcc-specs-ssp-to-all || continue
79 is-flagq -fno-stack-protector-all || append-flags -fno-stack-protector-all;;
80 esac
81 done
82 }
83
84 # Remove occurrences of strings from variable given in $1
85 # Strings removed are matched as globs, so for example
86 # '-O*' would remove -O1, -O2 etc.
87 _filter-var() {
88 local f x VAR VAL
89 declare -a new
90
91 VAR=$1
92 shift
93 eval VAL=\${${VAR}}
94 for f in ${VAL}; do
95 for x in "$@"; do
96 # Note this should work with globs like -O*
97 [[ ${f} == ${x} ]] && continue 2
98 done
99 eval new\[\${\#new\[@]}]=\${f}
100 done
101 eval export ${VAR}=\${new\[*]}
102 }
103
104 # @FUNCTION: filter-flags
105 # @USAGE: <flags>
106 # @DESCRIPTION:
107 # Remove particular <flags> from {C,CPP,CXX,F,FC}FLAGS. Accepts shell globs.
108 filter-flags() {
109 _filter-hardened "$@"
110 _filter-var CFLAGS "$@"
111 _filter-var CPPFLAGS "$@"
112 _filter-var CXXFLAGS "$@"
113 _filter-var FFLAGS "$@"
114 _filter-var FCFLAGS "$@"
115 return 0
116 }
117
118 # @FUNCTION: filter-lfs-flags
119 # @DESCRIPTION:
120 # Remove flags that enable Large File Support.
121 filter-lfs-flags() {
122 [[ -n $@ ]] && die "filter-lfs-flags takes no arguments"
123 filter-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
124 }
125
126 # @FUNCTION: append-cppflags
127 # @USAGE: <flags>
128 # @DESCRIPTION:
129 # Add extra <flags> to the current CPPFLAGS.
130 append-cppflags() {
131 [[ -z $* ]] && return 0
132 export CPPFLAGS="${CPPFLAGS} $*"
133 return 0
134 }
135
136 # @FUNCTION: append-fflags
137 # @USAGE: <flags>
138 # @DESCRIPTION:
139 # Add extra <flags> to the current {F,FC}FLAGS.
140 append-fflags() {
141 [[ -z $* ]] && return 0
142 export FFLAGS="${FFLAGS} $*"
143 export FCFLAGS="${FCFLAGS} $*"
144 return 0
145 }
146
147 # @FUNCTION: append-lfs-flags
148 # @DESCRIPTION:
149 # Add flags that enable Large File Support.
150 append-lfs-flags() {
151 [[ -n $@ ]] && die "append-lfs-flags takes no arguments"
152 append-cppflags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
153 }
154
155 # @FUNCTION: append-flags
156 # @USAGE: <flags>
157 # @DESCRIPTION:
158 # Add extra <flags> to your current {C,CXX,F,FC}FLAGS.
159 append-flags() {
160 [[ -z $* ]] && return 0
161 export CFLAGS="${CFLAGS} $*"
162 export CXXFLAGS="${CXXFLAGS} $*"
163 export FFLAGS="${FFLAGS} $*"
164 export FCFLAGS="${FCFLAGS} $*"
165 return 0
166 }
167
168 # @FUNCTION: replace-flags
169 # @USAGE: <old> <new>
170 # @DESCRIPTION:
171 # Replace the <old> flag with <new>. Accepts shell globs for <old>.
172 replace-flags() {
173 [[ $# != 2 ]] \
174 && echo && eerror "Usage: replace-flags <old flag> <new flag>" \
175 && die "replace-flags takes 2 arguments, not $#"
176
177 local f fset
178 declare -a new_CFLAGS new_CXXFLAGS new_FFLAGS new_FCFLAGS
179
180 for fset in CFLAGS CXXFLAGS FFLAGS FCFLAGS; do
181 # Looping over the flags instead of using a global
182 # substitution ensures that we're working with flag atoms.
183 # Otherwise globs like -O* have the potential to wipe out the
184 # list of flags.
185 for f in ${!fset}; do
186 # Note this should work with globs like -O*
187 [[ ${f} == ${1} ]] && f=${2}
188 eval new_${fset}\[\${\#new_${fset}\[@]}]=\${f}
189 done
190 eval export ${fset}=\${new_${fset}\[*]}
191 done
192
193 return 0
194 }
195
196 # @FUNCTION: replace-cpu-flags
197 # @USAGE: <old> <new>
198 # @DESCRIPTION:
199 # Replace cpu flags (like -march/-mcpu/-mtune) that select the <old> cpu
200 # with flags that select the <new> cpu. Accepts shell globs for <old>.
201 replace-cpu-flags() {
202 local newcpu="$#" ; newcpu="${!newcpu}"
203 while [ $# -gt 1 ] ; do
204 # quote to make sure that no globbing is done (particularly on
205 # ${oldcpu}) prior to calling replace-flags
206 replace-flags "-march=${1}" "-march=${newcpu}"
207 replace-flags "-mcpu=${1}" "-mcpu=${newcpu}"
208 replace-flags "-mtune=${1}" "-mtune=${newcpu}"
209 shift
210 done
211 return 0
212 }
213
214 _is_flagq() {
215 local x
216 for x in ${!1} ; do
217 [[ ${x} == $2 ]] && return 0
218 done
219 return 1
220 }
221
222 # @FUNCTION: is-flagq
223 # @USAGE: <flag>
224 # @DESCRIPTION:
225 # Returns shell true if <flag> is in {C,CXX,F,FC}FLAGS, else returns shell false. Accepts shell globs.
226 is-flagq() {
227 [[ -n $2 ]] && die "Usage: is-flag <flag>"
228 _is_flagq CFLAGS $1 || _is_flagq CXXFLAGS $1 || _is_flagq FFLAGS $1 || _is_flagq FCFLAGS $1
229 }
230
231 # @FUNCTION: is-flag
232 # @USAGE: <flag>
233 # @DESCRIPTION:
234 # Echo's "true" if flag is set in {C,CXX,F,FC}FLAGS. Accepts shell globs.
235 is-flag() {
236 is-flagq "$@" && echo true
237 }
238
239 # @FUNCTION: is-ldflagq
240 # @USAGE: <flag>
241 # @DESCRIPTION:
242 # Returns shell true if <flag> is in LDFLAGS, else returns shell false. Accepts shell globs.
243 is-ldflagq() {
244 [[ -n $2 ]] && die "Usage: is-ldflag <flag>"
245 _is_flagq LDFLAGS $1
246 }
247
248 # @FUNCTION: is-ldflag
249 # @USAGE: <flag>
250 # @DESCRIPTION:
251 # Echo's "true" if flag is set in LDFLAGS. Accepts shell globs.
252 is-ldflag() {
253 is-ldflagq "$@" && echo true
254 }
255
256 # @FUNCTION: filter-mfpmath
257 # @USAGE: <math types>
258 # @DESCRIPTION:
259 # Remove specified math types from the fpmath flag. For example, if the user
260 # has -mfpmath=sse,386, running `filter-mfpmath sse` will leave the user with
261 # -mfpmath=386.
262 filter-mfpmath() {
263 local orig_mfpmath new_math prune_math
264
265 # save the original -mfpmath flag
266 orig_mfpmath=$(get-flag -mfpmath)
267 # get the value of the current -mfpmath flag
268 new_math=$(get-flag mfpmath)
269 new_math=" ${new_math//,/ } "
270 # figure out which math values are to be removed
271 prune_math=""
272 for prune_math in "$@" ; do
273 new_math=${new_math/ ${prune_math} / }
274 done
275 new_math=$(echo ${new_math})
276 new_math=${new_math// /,}
277
278 if [[ -z ${new_math} ]] ; then
279 # if we're removing all user specified math values are
280 # slated for removal, then we just filter the flag
281 filter-flags ${orig_mfpmath}
282 else
283 # if we only want to filter some of the user specified
284 # math values, then we replace the current flag
285 replace-flags ${orig_mfpmath} -mfpmath=${new_math}
286 fi
287 return 0
288 }
289
290 # @FUNCTION: strip-flags
291 # @DESCRIPTION:
292 # Strip C[XX]FLAGS of everything except known good/safe flags.
293 strip-flags() {
294 local x y flag NEW_CFLAGS NEW_CXXFLAGS NEW_FFLAGS NEW_FCFLAGS
295
296 setup-allowed-flags
297
298 local NEW_CFLAGS=""
299 local NEW_CXXFLAGS=""
300 local NEW_FFLAGS=""
301 local NEW_FCFLAGS=""
302
303 # Allow unstable C[XX]FLAGS if we are using unstable profile ...
304 if has ~$(tc-arch) ${ACCEPT_KEYWORDS} ; then
305 ALLOWED_FLAGS="${ALLOWED_FLAGS} ${UNSTABLE_FLAGS}"
306 fi
307
308 set -f # disable pathname expansion
309
310 for x in ${CFLAGS}; do
311 for y in ${ALLOWED_FLAGS}; do
312 flag=${x%%=*}
313 if [ "${flag%%${y}}" = "" ] ; then
314 NEW_CFLAGS="${NEW_CFLAGS} ${x}"
315 break
316 fi
317 done
318 done
319
320 for x in ${CXXFLAGS}; do
321 for y in ${ALLOWED_FLAGS}; do
322 flag=${x%%=*}
323 if [ "${flag%%${y}}" = "" ] ; then
324 NEW_CXXFLAGS="${NEW_CXXFLAGS} ${x}"
325 break
326 fi
327 done
328 done
329
330 for x in ${FFLAGS}; do
331 for y in ${ALLOWED_FLAGS}; do
332 flag=${x%%=*}
333 if [ "${flag%%${y}}" = "" ] ; then
334 NEW_FFLAGS="${NEW_FFLAGS} ${x}"
335 break
336 fi
337 done
338 done
339
340 for x in ${FCFLAGS}; do
341 for y in ${ALLOWED_FLAGS}; do
342 flag=${x%%=*}
343 if [ "${flag%%${y}}" = "" ] ; then
344 NEW_FCFLAGS="${NEW_FCFLAGS} ${x}"
345 break
346 fi
347 done
348 done
349
350 # In case we filtered out all optimization flags fallback to -O2
351 if [ "${CFLAGS/-O}" != "${CFLAGS}" -a "${NEW_CFLAGS/-O}" = "${NEW_CFLAGS}" ]; then
352 NEW_CFLAGS="${NEW_CFLAGS} -O2"
353 fi
354 if [ "${CXXFLAGS/-O}" != "${CXXFLAGS}" -a "${NEW_CXXFLAGS/-O}" = "${NEW_CXXFLAGS}" ]; then
355 NEW_CXXFLAGS="${NEW_CXXFLAGS} -O2"
356 fi
357 if [ "${FFLAGS/-O}" != "${FFLAGS}" -a "${NEW_FFLAGS/-O}" = "${NEW_FFLAGS}" ]; then
358 NEW_FFLAGS="${NEW_FFLAGS} -O2"
359 fi
360 if [ "${FCFLAGS/-O}" != "${FCFLAGS}" -a "${NEW_FCFLAGS/-O}" = "${NEW_FCFLAGS}" ]; then
361 NEW_FCFLAGS="${NEW_FCFLAGS} -O2"
362 fi
363
364 set +f # re-enable pathname expansion
365
366 export CFLAGS="${NEW_CFLAGS}"
367 export CXXFLAGS="${NEW_CXXFLAGS}"
368 export FFLAGS="${NEW_FFLAGS}"
369 export FCFLAGS="${NEW_FCFLAGS}"
370 return 0
371 }
372
373 test-flag-PROG() {
374 local comp=$1
375 local flags="$2"
376
377 [[ -z ${comp} || -z ${flags} ]] && \
378 return 1
379
380 local PROG=$(tc-get${comp})
381 ${PROG} ${flags} -S -o /dev/null -xc /dev/null \
382 > /dev/null 2>&1
383 }
384
385 # @FUNCTION: test-flag-CC
386 # @USAGE: <flag>
387 # @DESCRIPTION:
388 # Returns shell true if <flag> is supported by the C compiler, else returns shell false.
389 test-flag-CC() { test-flag-PROG "CC" "$1"; }
390
391 # @FUNCTION: test-flag-CXX
392 # @USAGE: <flag>
393 # @DESCRIPTION:
394 # Returns shell true if <flag> is supported by the C++ compiler, else returns shell false.
395 test-flag-CXX() { test-flag-PROG "CXX" "$1"; }
396
397 # @FUNCTION: test-flag-F77
398 # @USAGE: <flag>
399 # @DESCRIPTION:
400 # Returns shell true if <flag> is supported by the Fortran 77 compiler, else returns shell false.
401 test-flag-F77() { test-flag-PROG "F77" "$1"; }
402
403 # @FUNCTION: test-flag-FC
404 # @USAGE: <flag>
405 # @DESCRIPTION:
406 # Returns shell true if <flag> is supported by the Fortran 90 compiler, else returns shell false.
407 test-flag-FC() { test-flag-PROG "FC" "$1"; }
408
409 test-flags-PROG() {
410 local comp=$1
411 local flags
412 local x
413
414 shift
415
416 [[ -z ${comp} ]] && return 1
417
418 x=""
419 for x in "$@" ; do
420 test-flag-${comp} "${x}" && flags="${flags}${flags:+ }${x}"
421 done
422
423 echo "${flags}"
424
425 # Just bail if we dont have any flags
426 [[ -n ${flags} ]]
427 }
428
429 # @FUNCTION: test-flags-CC
430 # @USAGE: <flags>
431 # @DESCRIPTION:
432 # Returns shell true if <flags> are supported by the C compiler, else returns shell false.
433 test-flags-CC() { test-flags-PROG "CC" "$@"; }
434
435 # @FUNCTION: test-flags-CXX
436 # @USAGE: <flags>
437 # @DESCRIPTION:
438 # Returns shell true if <flags> are supported by the C++ compiler, else returns shell false.
439 test-flags-CXX() { test-flags-PROG "CXX" "$@"; }
440
441 # @FUNCTION: test-flags-F77
442 # @USAGE: <flags>
443 # @DESCRIPTION:
444 # Returns shell true if <flags> are supported by the Fortran 77 compiler, else returns shell false.
445 test-flags-F77() { test-flags-PROG "F77" "$@"; }
446
447 # @FUNCTION: test-flags-FC
448 # @USAGE: <flags>
449 # @DESCRIPTION:
450 # Returns shell true if <flags> are supported by the Fortran 90 compiler, else returns shell false.
451 test-flags-FC() { test-flags-PROG "FC" "$@"; }
452
453 # @FUNCTION: test-flags
454 # @USAGE: <flags>
455 # @DESCRIPTION:
456 # Short-hand that should hopefully work for both C and C++ compiler, but
457 # its really only present due to the append-flags() abomination.
458 test-flags() { test-flags-CC "$@"; }
459
460 # @FUNCTION: test_flag
461 # @DESCRIPTION:
462 # DEPRICIATED, use test-flags()
463 test_flag() {
464 ewarn "test_flag: deprecated, please use test-flags()!" >&2
465
466 test-flags-CC "$@"
467 }
468
469 # @FUNCTION: test_version_info
470 # @USAGE: <version>
471 # @DESCRIPTION:
472 # Returns shell true if the current C compiler version matches <version>, else returns shell false.
473 # Accepts shell globs.
474 test_version_info() {
475 if [[ $($(tc-getCC) --version 2>&1) == *$1* ]]; then
476 return 0
477 else
478 return 1
479 fi
480 }
481
482 # @FUNCTION: strip-unsupported-flags
483 # @DESCRIPTION:
484 # Strip {C,CXX,F,FC}FLAGS of any flags not supported by the active toolchain.
485 strip-unsupported-flags() {
486 export CFLAGS=$(test-flags-CC ${CFLAGS})
487 export CXXFLAGS=$(test-flags-CXX ${CXXFLAGS})
488 export FFLAGS=$(test-flags-F77 ${FFLAGS})
489 export FCFLAGS=$(test-flags-FC ${FCFLAGS})
490 }
491
492 # @FUNCTION: get-flag
493 # @USAGE: <flag>
494 # @DESCRIPTION:
495 # Find and echo the value for a particular flag. Accepts shell globs.
496 get-flag() {
497 local f findflag="$1"
498
499 # this code looks a little flaky but seems to work for
500 # everything we want ...
501 # for example, if CFLAGS="-march=i686":
502 # `get-flag -march` == "-march=i686"
503 # `get-flag march` == "i686"
504 for f in ${CFLAGS} ${CXXFLAGS} ${FFLAGS} ${FCFLAGS} ; do
505 if [ "${f/${findflag}}" != "${f}" ] ; then
506 printf "%s\n" "${f/-${findflag}=}"
507 return 0
508 fi
509 done
510 return 1
511 }
512
513 # @FUNCTION: has_hardened
514 # @DESCRIPTION:
515 # DEPRECATED - use gcc-specs-relro or gcc-specs-now from toolchain-funcs
516 has_hardened() {
517 ewarn "has_hardened: deprecated, please use gcc-specs-{relro,now}()!" >&2
518
519 test_version_info Hardened && return 0
520 # The specs file wont exist unless gcc has GCC_SPECS support
521 [[ -f ${GCC_SPECS} && ${GCC_SPECS} != ${GCC_SPECS/hardened/} ]]
522 }
523
524 # @FUNCTION: has_pic
525 # @DESCRIPTION:
526 # DEPRECATED - use gcc-specs-pie from toolchain-funcs
527 # indicate whether PIC is set
528 has_pic() {
529 ewarn "has_pic: deprecated, please use gcc-specs-pie()!" >&2
530
531 [[ ${CFLAGS/-fPIC} != ${CFLAGS} || \
532 ${CFLAGS/-fpic} != ${CFLAGS} ]] || \
533 gcc-specs-pie
534 }
535
536 # @FUNCTION: has_pie
537 # @DESCRIPTION:
538 # DEPRECATED - use gcc-specs-pie from toolchain-funcs
539 # indicate whether PIE is set
540 has_pie() {
541 ewarn "has_pie: deprecated, please use gcc-specs-pie()!" >&2
542
543 [[ ${CFLAGS/-fPIE} != ${CFLAGS} || \
544 ${CFLAGS/-fpie} != ${CFLAGS} ]] || \
545 gcc-specs-pie
546 }
547
548 # @FUNCTION: has_ssp_all
549 # @DESCRIPTION:
550 # DEPRECATED - use gcc-specs-ssp from toolchain-funcs
551 # indicate whether code for SSP is being generated for all functions
552 has_ssp_all() {
553 ewarn "has_ssp_all: deprecated, please use gcc-specs-ssp()!" >&2
554
555 # note; this matches only -fstack-protector-all
556 [[ ${CFLAGS/-fstack-protector-all} != ${CFLAGS} || \
557 -n $(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __SSP_ALL__) ]] || \
558 gcc-specs-ssp-all
559 }
560
561 # @FUNCTION: has_ssp
562 # @DESCRIPTION:
563 # DEPRECATED - use gcc-specs-ssp from toolchain-funcs
564 # indicate whether code for SSP is being generated
565 has_ssp() {
566 ewarn "has_ssp: deprecated, please use gcc-specs-ssp()!" >&2
567
568 # note; this matches both -fstack-protector and -fstack-protector-all
569 [[ ${CFLAGS/-fstack-protector} != ${CFLAGS} || \
570 -n $(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __SSP__) ]] || \
571 gcc-specs-ssp
572 }
573
574 # @FUNCTION: has_m64
575 # @DESCRIPTION:
576 # This doesn't test if the flag is accepted, it tests if the flag actually
577 # WORKS. Non-multilib gcc will take both -m32 and -m64. If the flag works
578 # return code is 0, else the return code is 1.
579 has_m64() {
580 # this doesnt test if the flag is accepted, it tests if the flag
581 # actually -WORKS-. non-multilib gcc will take both -m32 and -m64!
582 # please dont replace this function with test_flag in some future
583 # clean-up!
584
585 local temp="$(emktemp)"
586 echo "int main() { return(0); }" > "${temp}".c
587 MY_CC=$(tc-getCC)
588 ${MY_CC/ .*/} -m64 -o "$(emktemp)" "${temp}".c > /dev/null 2>&1
589 local ret=$?
590 rm -f "${temp}".c
591 [[ ${ret} != 1 ]] && return 0
592 return 1
593 }
594
595 # @FUNCTION: has_m32
596 # @DESCRIPTION:
597 # This doesn't test if the flag is accepted, it tests if the flag actually
598 # WORKS. Non-mulilib gcc will take both -m32 and -64. If the flag works return
599 # code is 0, else return code is 1.
600 has_m32() {
601 # this doesnt test if the flag is accepted, it tests if the flag
602 # actually -WORKS-. non-multilib gcc will take both -m32 and -m64!
603 # please dont replace this function with test_flag in some future
604 # clean-up!
605
606 [ "$(tc-arch)" = "amd64" ] && has_multilib_profile && return 0
607
608 local temp=$(emktemp)
609 echo "int main() { return(0); }" > "${temp}".c
610 MY_CC=$(tc-getCC)
611 ${MY_CC/ .*/} -m32 -o "$(emktemp)" "${temp}".c > /dev/null 2>&1
612 local ret=$?
613 rm -f "${temp}".c
614 [[ ${ret} != 1 ]] && return 0
615 return 1
616 }
617
618 # @FUNCTION: replace-sparc64-flags
619 # @DESCRIPTION:
620 # Sets mcpu to v8 and uses the original value as mtune if none specified.
621 replace-sparc64-flags() {
622 local SPARC64_CPUS="ultrasparc3 ultrasparc v9"
623
624 if [ "${CFLAGS/mtune}" != "${CFLAGS}" ]; then
625 for x in ${SPARC64_CPUS}; do
626 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8}"
627 done
628 else
629 for x in ${SPARC64_CPUS}; do
630 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
631 done
632 fi
633
634 if [ "${CXXFLAGS/mtune}" != "${CXXFLAGS}" ]; then
635 for x in ${SPARC64_CPUS}; do
636 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8}"
637 done
638 else
639 for x in ${SPARC64_CPUS}; do
640 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
641 done
642 fi
643
644 export CFLAGS CXXFLAGS
645 }
646
647 # @FUNCTION: append-ldflags
648 # @USAGE: <flags>
649 # @DESCRIPTION:
650 # Add extra <flags> to the current LDFLAGS.
651 append-ldflags() {
652 [[ -z $* ]] && return 0
653 local flag
654 for flag in "$@"; do
655 [[ ${flag} == -l* ]] && \
656 ewarn "Appending a library link instruction (${flag}); libraries to link to should not be passed through LDFLAGS"
657 done
658
659 export LDFLAGS="${LDFLAGS} $*"
660 return 0
661 }
662
663 # @FUNCTION: filter-ldflags
664 # @USAGE: <flags>
665 # @DESCRIPTION:
666 # Remove particular <flags> from LDFLAGS. Accepts shell globs.
667 filter-ldflags() {
668 _filter-var LDFLAGS "$@"
669 return 0
670 }
671
672 # @FUNCTION: raw-ldflags
673 # @USAGE: <flags>
674 # @DESCRIPTION:
675 # Turn C style ldflags (-Wl,-foo) into straight ldflags - the results
676 # are suitable for passing directly to 'ld'; note LDFLAGS is usually passed
677 # to gcc where it needs the '-Wl,'.
678 raw-ldflags() {
679 local x input="$@"
680 [[ -z ${input} ]] && input=${LDFLAGS}
681 set --
682 for x in ${input} ; do
683 x=${x#-Wl,}
684 set -- "$@" ${x//,/ }
685 done
686 echo "$@"
687 }
688
689 # @FUNCTION: bindnow-flags
690 # @RETURN: Returns the flags to enable "now" binding in the current selected linker.
691 # @DESCRIPTION:
692 # DEPRECATED - Gets the flags needed for "NOW" binding
693 bindnow-flags() {
694 ewarn "QA: stop using the bindnow-flags function ... simply drop it from your ebuild" >&2
695
696 case $($(tc-getLD) -v 2>&1 </dev/null) in
697 *GNU* | *'with BFD'*) # GNU ld
698 echo "-Wl,-z,now" ;;
699 *Apple*) # Darwin ld
700 echo "-bind_at_load" ;;
701 *)
702 # Some linkers just recognize -V instead of -v
703 case $($(tc-getLD) -V 2>&1 </dev/null) in
704 *Solaris*) # Solaris accept almost the same GNU options
705 echo "-Wl,-z,now" ;;
706 esac
707 ;;
708 esac
709 }
710
711
712 # Some tests for when we screw with things and want to make
713 # sure we didn't break anything
714 #TESTS() {
715 # CFLAGS="-a -b -c=1"
716 # CXXFLAGS="-x -y -z=2"
717 # LDFLAGS="-l -m -n=3"
718 #
719 # die() { exit 1; }
720 # (is-flag 1 2 3) && die
721 # (is-ldflag 1 2 3) && die
722 #
723 # is-flagq -l && die
724 # is-ldflagq -a && die
725 # is-flagq -a || die
726 # is-flagq -x || die
727 # is-ldflagq -n=* || die
728 # is-ldflagq -n && die
729 #
730 # strip-unsupported-flags
731 # [[ ${CFLAGS} == "-c=1" ]] || die
732 # [[ ${CXXFLAGS} == "-y -z=2" ]] || die
733 #
734 # echo "All tests pass"
735 #}
736 #TESTS

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