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Revision 1.206 - (show annotations) (download)
Sun May 24 07:05:30 2015 UTC (2 months, 1 week ago) by vapier
Branch: MAIN
CVS Tags: HEAD
Changes since 1.205: +3 -3 lines
add newer -fbounds-check form to the allowed flag list #530068 by Sebastian Pipping

1 # Copyright 1999-2014 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 1.205 2015/05/06 07:04:53 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 [[ -z ${_FLAG_O_MATIC_ECLASS} ]]; then
14 _FLAG_O_MATIC_ECLASS=1
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 -Og -mcpu -march -mtune"
28 ALLOWED_FLAGS+=" -fstack-protector* -fsanitize=*"
29 ALLOWED_FLAGS+=" -fbounds-check -fbounds-checking -fno-strict-overflow"
30 ALLOWED_FLAGS+=" -fno-PIE -fno-pie -nopie -fno-unit-at-a-time"
31 ALLOWED_FLAGS+=" -g -g[0-9] -ggdb -ggdb[0-9] -gdwarf-* gstabs -gstabs+"
32 ALLOWED_FLAGS+=" -fno-ident -fpermissive -frecord-gcc-switches"
33 ALLOWED_FLAGS+=" -fdiagnostics*"
34 ALLOWED_FLAGS+=" -W* -w"
35
36 # allow a bunch of flags that negate features / control ABI
37 ALLOWED_FLAGS+=" -fno-stack-protector* -fabi-version=* \
38 -fno-strict-aliasing -fno-bounds-check -fno-bounds-checking -fstrict-overflow \
39 -fno-omit-frame-pointer -fno-builtin*"
40 ALLOWED_FLAGS+=" -mregparm -mno-app-regs -mapp-regs -mno-mmx -mno-sse \
41 -mno-sse2 -mno-sse3 -mno-ssse3 -mno-sse4 -mno-sse4.1 -mno-sse4.2 \
42 -mno-avx -mno-aes -mno-pclmul -mno-sse4a -mno-3dnow -mno-popcnt \
43 -mno-abm -mips1 -mips2 -mips3 -mips4 -mips32 -mips64 -mips16 -mplt \
44 -msoft-float -mno-soft-float -mhard-float -mno-hard-float -mfpu \
45 -mieee -mieee-with-inexact -mschedule -mfloat-gprs -mspe -mno-spe \
46 -mtls-direct-seg-refs -mno-tls-direct-seg-refs -mflat -mno-flat \
47 -mno-faster-structs -mfaster-structs -m32 -m64 -mx32 -mabi \
48 -mlittle-endian -mbig-endian -EL -EB -fPIC -mlive-g0 -mcmodel \
49 -mstack-bias -mno-stack-bias -msecure-plt -m*-toc -mfloat-abi \
50 -mfix-r10000 -mno-fix-r10000 -D* -U*"
51
52 # 4.5
53 ALLOWED_FLAGS+=" -mno-fma4 -mno-movbe -mno-xop -mno-lwp"
54 # 4.6
55 ALLOWED_FLAGS+=" -mno-fsgsbase -mno-rdrnd -mno-f16c -mno-bmi -mno-tbm"
56 # 4.7
57 ALLOWED_FLAGS+=" -mno-avx2 -mno-bmi2 -mno-fma -mno-lzcnt"
58 # 4.8
59 ALLOWED_FLAGS+=" -mno-fxsr -mno-rtm -mno-xsave -mno-xsaveopt"
60 # 4.9
61 ALLOWED_FLAGS+=" -mno-avx512cd -mno-avx512er -mno-avx512f -mno-avx512pf -mno-sha"
62
63 # CPPFLAGS and LDFLAGS
64 ALLOWED_FLAGS+=" -I* -L* -R* -Wl,*"
65
66 export ALLOWED_FLAGS
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=$1 new=()
100 shift
101
102 for f in ${!var} ; do
103 for x in "$@" ; do
104 # Note this should work with globs like -O*
105 [[ ${f} == ${x} ]] && continue 2
106 done
107 new+=( "${f}" )
108 done
109 eval export ${var}=\""${new[*]}"\"
110 }
111
112 # @FUNCTION: filter-flags
113 # @USAGE: <flags>
114 # @DESCRIPTION:
115 # Remove particular <flags> from {C,CPP,CXX,CCAS,F,FC,LD}FLAGS. Accepts shell globs.
116 filter-flags() {
117 _filter-hardened "$@"
118 local v
119 for v in $(all-flag-vars) ; do
120 _filter-var ${v} "$@"
121 done
122 return 0
123 }
124
125 # @FUNCTION: filter-lfs-flags
126 # @DESCRIPTION:
127 # Remove flags that enable Large File Support.
128 filter-lfs-flags() {
129 [[ $# -ne 0 ]] && die "filter-lfs-flags takes no arguments"
130 # http://www.gnu.org/s/libc/manual/html_node/Feature-Test-Macros.html
131 # _LARGEFILE_SOURCE: enable support for new LFS funcs (ftello/etc...)
132 # _LARGEFILE64_SOURCE: enable support for 64bit variants (off64_t/fseeko64/etc...)
133 # _FILE_OFFSET_BITS: default to 64bit variants (off_t is defined as off64_t)
134 filter-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
135 }
136
137 # @FUNCTION: filter-ldflags
138 # @USAGE: <flags>
139 # @DESCRIPTION:
140 # Remove particular <flags> from LDFLAGS. Accepts shell globs.
141 filter-ldflags() {
142 _filter-var LDFLAGS "$@"
143 return 0
144 }
145
146 # @FUNCTION: append-cppflags
147 # @USAGE: <flags>
148 # @DESCRIPTION:
149 # Add extra <flags> to the current CPPFLAGS.
150 append-cppflags() {
151 [[ $# -eq 0 ]] && return 0
152 export CPPFLAGS+=" $*"
153 return 0
154 }
155
156 # @FUNCTION: append-cflags
157 # @USAGE: <flags>
158 # @DESCRIPTION:
159 # Add extra <flags> to the current CFLAGS. If a flag might not be supported
160 # with different compilers (or versions), then use test-flags-CC like so:
161 # @CODE
162 # append-cflags $(test-flags-CC -funky-flag)
163 # @CODE
164 append-cflags() {
165 [[ $# -eq 0 ]] && return 0
166 # Do not do automatic flag testing ourselves. #417047
167 export CFLAGS+=" $*"
168 return 0
169 }
170
171 # @FUNCTION: append-cxxflags
172 # @USAGE: <flags>
173 # @DESCRIPTION:
174 # Add extra <flags> to the current CXXFLAGS. If a flag might not be supported
175 # with different compilers (or versions), then use test-flags-CXX like so:
176 # @CODE
177 # append-cxxflags $(test-flags-CXX -funky-flag)
178 # @CODE
179 append-cxxflags() {
180 [[ $# -eq 0 ]] && return 0
181 # Do not do automatic flag testing ourselves. #417047
182 export CXXFLAGS+=" $*"
183 return 0
184 }
185
186 # @FUNCTION: append-fflags
187 # @USAGE: <flags>
188 # @DESCRIPTION:
189 # Add extra <flags> to the current {F,FC}FLAGS. If a flag might not be supported
190 # with different compilers (or versions), then use test-flags-F77 like so:
191 # @CODE
192 # append-fflags $(test-flags-F77 -funky-flag)
193 # @CODE
194 append-fflags() {
195 [[ $# -eq 0 ]] && return 0
196 # Do not do automatic flag testing ourselves. #417047
197 export FFLAGS+=" $*"
198 export FCFLAGS+=" $*"
199 return 0
200 }
201
202 # @FUNCTION: append-lfs-flags
203 # @DESCRIPTION:
204 # Add flags that enable Large File Support.
205 append-lfs-flags() {
206 [[ $# -ne 0 ]] && die "append-lfs-flags takes no arguments"
207 # see comments in filter-lfs-flags func for meaning of these
208 append-cppflags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
209 }
210
211 # @FUNCTION: append-ldflags
212 # @USAGE: <flags>
213 # @DESCRIPTION:
214 # Add extra <flags> to the current LDFLAGS.
215 append-ldflags() {
216 [[ $# -eq 0 ]] && return 0
217 local flag
218 for flag in "$@"; do
219 [[ ${flag} == -l* ]] && \
220 eqawarn "Appending a library link instruction (${flag}); libraries to link to should not be passed through LDFLAGS"
221 done
222
223 export LDFLAGS="${LDFLAGS} $*"
224 return 0
225 }
226
227 # @FUNCTION: append-flags
228 # @USAGE: <flags>
229 # @DESCRIPTION:
230 # Add extra <flags> to your current {C,CXX,F,FC}FLAGS.
231 append-flags() {
232 [[ $# -eq 0 ]] && return 0
233 case " $* " in
234 *' '-[DIU]*) eqawarn 'please use append-cppflags for preprocessor flags' ;;
235 *' '-L*|\
236 *' '-Wl,*) eqawarn 'please use append-ldflags for linker flags' ;;
237 esac
238 append-cflags "$@"
239 append-cxxflags "$@"
240 append-fflags "$@"
241 return 0
242 }
243
244 # @FUNCTION: replace-flags
245 # @USAGE: <old> <new>
246 # @DESCRIPTION:
247 # Replace the <old> flag with <new>. Accepts shell globs for <old>.
248 replace-flags() {
249 [[ $# != 2 ]] && die "Usage: replace-flags <old flag> <new flag>"
250
251 local f var new
252 for var in $(all-flag-vars) ; do
253 # Looping over the flags instead of using a global
254 # substitution ensures that we're working with flag atoms.
255 # Otherwise globs like -O* have the potential to wipe out the
256 # list of flags.
257 new=()
258 for f in ${!var} ; do
259 # Note this should work with globs like -O*
260 [[ ${f} == ${1} ]] && f=${2}
261 new+=( "${f}" )
262 done
263 eval export ${var}=\""${new[*]}"\"
264 done
265
266 return 0
267 }
268
269 # @FUNCTION: replace-cpu-flags
270 # @USAGE: <old> <new>
271 # @DESCRIPTION:
272 # Replace cpu flags (like -march/-mcpu/-mtune) that select the <old> cpu
273 # with flags that select the <new> cpu. Accepts shell globs for <old>.
274 replace-cpu-flags() {
275 local newcpu="$#" ; newcpu="${!newcpu}"
276 while [ $# -gt 1 ] ; do
277 # quote to make sure that no globbing is done (particularly on
278 # ${oldcpu}) prior to calling replace-flags
279 replace-flags "-march=${1}" "-march=${newcpu}"
280 replace-flags "-mcpu=${1}" "-mcpu=${newcpu}"
281 replace-flags "-mtune=${1}" "-mtune=${newcpu}"
282 shift
283 done
284 return 0
285 }
286
287 _is_flagq() {
288 local x var
289 eval var=\""\${$1[*]}"\"
290 for x in ${var} ; do
291 [[ ${x} == $2 ]] && return 0
292 done
293 return 1
294 }
295
296 # @FUNCTION: is-flagq
297 # @USAGE: <flag>
298 # @DESCRIPTION:
299 # Returns shell true if <flag> is in {C,CXX,F,FC}FLAGS, else returns shell false. Accepts shell globs.
300 is-flagq() {
301 [[ -n $2 ]] && die "Usage: is-flag <flag>"
302
303 local var
304 for var in $(all-flag-vars) ; do
305 _is_flagq ${var} "$1" && return 0
306 done
307 return 1
308 }
309
310 # @FUNCTION: is-flag
311 # @USAGE: <flag>
312 # @DESCRIPTION:
313 # Echo's "true" if flag is set in {C,CXX,F,FC}FLAGS. Accepts shell globs.
314 is-flag() {
315 is-flagq "$@" && echo true
316 }
317
318 # @FUNCTION: is-ldflagq
319 # @USAGE: <flag>
320 # @DESCRIPTION:
321 # Returns shell true if <flag> is in LDFLAGS, else returns shell false. Accepts shell globs.
322 is-ldflagq() {
323 [[ -n $2 ]] && die "Usage: is-ldflag <flag>"
324 _is_flagq LDFLAGS $1
325 }
326
327 # @FUNCTION: is-ldflag
328 # @USAGE: <flag>
329 # @DESCRIPTION:
330 # Echo's "true" if flag is set in LDFLAGS. Accepts shell globs.
331 is-ldflag() {
332 is-ldflagq "$@" && echo true
333 }
334
335 # @FUNCTION: filter-mfpmath
336 # @USAGE: <math types>
337 # @DESCRIPTION:
338 # Remove specified math types from the fpmath flag. For example, if the user
339 # has -mfpmath=sse,386, running `filter-mfpmath sse` will leave the user with
340 # -mfpmath=386.
341 filter-mfpmath() {
342 local orig_mfpmath new_math prune_math
343
344 # save the original -mfpmath flag
345 orig_mfpmath=$(get-flag -mfpmath)
346 # get the value of the current -mfpmath flag
347 new_math=$(get-flag mfpmath)
348 # convert "both" to something we can filter
349 new_math=${new_math/both/387,sse}
350 new_math=" ${new_math//[,+]/ } "
351 # figure out which math values are to be removed
352 prune_math=""
353 for prune_math in "$@" ; do
354 new_math=${new_math/ ${prune_math} / }
355 done
356 new_math=$(echo ${new_math})
357 new_math=${new_math// /,}
358
359 if [[ -z ${new_math} ]] ; then
360 # if we're removing all user specified math values are
361 # slated for removal, then we just filter the flag
362 filter-flags ${orig_mfpmath}
363 else
364 # if we only want to filter some of the user specified
365 # math values, then we replace the current flag
366 replace-flags ${orig_mfpmath} -mfpmath=${new_math}
367 fi
368 return 0
369 }
370
371 # @FUNCTION: strip-flags
372 # @DESCRIPTION:
373 # Strip *FLAGS of everything except known good/safe flags. This runs over all
374 # flags returned by all_flag_vars().
375 strip-flags() {
376 local x y var
377
378 setup-allowed-flags
379
380 set -f # disable pathname expansion
381
382 for var in $(all-flag-vars) ; do
383 local new=()
384
385 for x in ${!var} ; do
386 local flag=${x%%=*}
387 for y in ${ALLOWED_FLAGS} ; do
388 if [[ -z ${flag%%${y}} ]] ; then
389 new+=( "${x}" )
390 break
391 fi
392 done
393 done
394
395 # In case we filtered out all optimization flags fallback to -O2
396 if _is_flagq ${var} "-O*" && ! _is_flagq new "-O*" ; then
397 new+=( -O2 )
398 fi
399
400 if [[ ${!var} != "${new[*]}" ]] ; then
401 einfo "strip-flags: ${var}: changed '${!var}' to '${new[*]}'"
402 fi
403 eval export ${var}=\""${new[*]}"\"
404 done
405
406 set +f # re-enable pathname expansion
407
408 return 0
409 }
410
411 test-flag-PROG() {
412 local comp=$1
413 local lang=$2
414 local flag=$3
415
416 [[ -z ${comp} || -z ${flag} ]] && return 1
417
418 local cmdline=(
419 $(tc-get${comp})
420 # Clang will warn about unknown gcc flags but exit 0.
421 # Need -Werror to force it to exit non-zero.
422 -Werror
423 # Use -c so we can test the assembler as well.
424 -c -o /dev/null
425 )
426 if "${cmdline[@]}" -x${lang} - </dev/null >/dev/null 2>&1 ; then
427 "${cmdline[@]}" "${flag}" -x${lang} - </dev/null >/dev/null 2>&1
428 else
429 "${cmdline[@]}" "${flag}" -c -o /dev/null /dev/null >/dev/null 2>&1
430 fi
431 }
432
433 # @FUNCTION: test-flag-CC
434 # @USAGE: <flag>
435 # @DESCRIPTION:
436 # Returns shell true if <flag> is supported by the C compiler, else returns shell false.
437 test-flag-CC() { test-flag-PROG "CC" c "$1"; }
438
439 # @FUNCTION: test-flag-CXX
440 # @USAGE: <flag>
441 # @DESCRIPTION:
442 # Returns shell true if <flag> is supported by the C++ compiler, else returns shell false.
443 test-flag-CXX() { test-flag-PROG "CXX" c++ "$1"; }
444
445 # @FUNCTION: test-flag-F77
446 # @USAGE: <flag>
447 # @DESCRIPTION:
448 # Returns shell true if <flag> is supported by the Fortran 77 compiler, else returns shell false.
449 test-flag-F77() { test-flag-PROG "F77" f77 "$1"; }
450
451 # @FUNCTION: test-flag-FC
452 # @USAGE: <flag>
453 # @DESCRIPTION:
454 # Returns shell true if <flag> is supported by the Fortran 90 compiler, else returns shell false.
455 test-flag-FC() { test-flag-PROG "FC" f95 "$1"; }
456
457 test-flags-PROG() {
458 local comp=$1
459 local flags=()
460 local x
461
462 shift
463
464 [[ -z ${comp} ]] && return 1
465
466 for x ; do
467 test-flag-${comp} "${x}" && flags+=( "${x}" )
468 done
469
470 echo "${flags[*]}"
471
472 # Just bail if we dont have any flags
473 [[ ${#flags[@]} -gt 0 ]]
474 }
475
476 # @FUNCTION: test-flags-CC
477 # @USAGE: <flags>
478 # @DESCRIPTION:
479 # Returns shell true if <flags> are supported by the C compiler, else returns shell false.
480 test-flags-CC() { test-flags-PROG "CC" "$@"; }
481
482 # @FUNCTION: test-flags-CXX
483 # @USAGE: <flags>
484 # @DESCRIPTION:
485 # Returns shell true if <flags> are supported by the C++ compiler, else returns shell false.
486 test-flags-CXX() { test-flags-PROG "CXX" "$@"; }
487
488 # @FUNCTION: test-flags-F77
489 # @USAGE: <flags>
490 # @DESCRIPTION:
491 # Returns shell true if <flags> are supported by the Fortran 77 compiler, else returns shell false.
492 test-flags-F77() { test-flags-PROG "F77" "$@"; }
493
494 # @FUNCTION: test-flags-FC
495 # @USAGE: <flags>
496 # @DESCRIPTION:
497 # Returns shell true if <flags> are supported by the Fortran 90 compiler, else returns shell false.
498 test-flags-FC() { test-flags-PROG "FC" "$@"; }
499
500 # @FUNCTION: test-flags
501 # @USAGE: <flags>
502 # @DESCRIPTION:
503 # Short-hand that should hopefully work for both C and C++ compiler, but
504 # its really only present due to the append-flags() abomination.
505 test-flags() { test-flags-CC "$@"; }
506
507 # @FUNCTION: test_version_info
508 # @USAGE: <version>
509 # @DESCRIPTION:
510 # Returns shell true if the current C compiler version matches <version>, else returns shell false.
511 # Accepts shell globs.
512 test_version_info() {
513 if [[ $($(tc-getCC) --version 2>&1) == *$1* ]]; then
514 return 0
515 else
516 return 1
517 fi
518 }
519
520 # @FUNCTION: strip-unsupported-flags
521 # @DESCRIPTION:
522 # Strip {C,CXX,F,FC}FLAGS of any flags not supported by the active toolchain.
523 strip-unsupported-flags() {
524 export CFLAGS=$(test-flags-CC ${CFLAGS})
525 export CXXFLAGS=$(test-flags-CXX ${CXXFLAGS})
526 export FFLAGS=$(test-flags-F77 ${FFLAGS})
527 export FCFLAGS=$(test-flags-FC ${FCFLAGS})
528 }
529
530 # @FUNCTION: get-flag
531 # @USAGE: <flag>
532 # @DESCRIPTION:
533 # Find and echo the value for a particular flag. Accepts shell globs.
534 get-flag() {
535 local f var findflag="$1"
536
537 # this code looks a little flaky but seems to work for
538 # everything we want ...
539 # for example, if CFLAGS="-march=i686":
540 # `get-flag -march` == "-march=i686"
541 # `get-flag march` == "i686"
542 for var in $(all-flag-vars) ; do
543 for f in ${!var} ; do
544 if [ "${f/${findflag}}" != "${f}" ] ; then
545 printf "%s\n" "${f/-${findflag}=}"
546 return 0
547 fi
548 done
549 done
550 return 1
551 }
552
553 # @FUNCTION: has_m64
554 # @DESCRIPTION:
555 # This doesn't test if the flag is accepted, it tests if the flag actually
556 # WORKS. Non-multilib gcc will take both -m32 and -m64. If the flag works
557 # return code is 0, else the return code is 1.
558 has_m64() {
559 eqawarn "${FUNCNAME}: don't use this anymore"
560
561 # this doesnt test if the flag is accepted, it tests if the flag
562 # actually -WORKS-. non-multilib gcc will take both -m32 and -m64!
563 # please dont replace this function with test_flag in some future
564 # clean-up!
565
566 local temp="$(emktemp)"
567 echo "int main() { return(0); }" > "${temp}".c
568 MY_CC=$(tc-getCC)
569 ${MY_CC/ .*/} -m64 -o "$(emktemp)" "${temp}".c > /dev/null 2>&1
570 local ret=$?
571 rm -f "${temp}".c
572 [[ ${ret} != 1 ]] && return 0
573 return 1
574 }
575
576 has_m32() {
577 die "${FUNCNAME}: don't use this anymore"
578 }
579
580 # @FUNCTION: replace-sparc64-flags
581 # @DESCRIPTION:
582 # Sets mcpu to v8 and uses the original value as mtune if none specified.
583 replace-sparc64-flags() {
584 local SPARC64_CPUS="ultrasparc3 ultrasparc v9"
585
586 if [ "${CFLAGS/mtune}" != "${CFLAGS}" ]; then
587 for x in ${SPARC64_CPUS}; do
588 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8}"
589 done
590 else
591 for x in ${SPARC64_CPUS}; do
592 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
593 done
594 fi
595
596 if [ "${CXXFLAGS/mtune}" != "${CXXFLAGS}" ]; then
597 for x in ${SPARC64_CPUS}; do
598 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8}"
599 done
600 else
601 for x in ${SPARC64_CPUS}; do
602 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
603 done
604 fi
605
606 export CFLAGS CXXFLAGS
607 }
608
609 # @FUNCTION: append-libs
610 # @USAGE: <libs>
611 # @DESCRIPTION:
612 # Add extra <libs> to the current LIBS. All arguments should be prefixed with
613 # either -l or -L. For compatibility, if arguments are not prefixed as
614 # options, they are given a -l prefix automatically.
615 append-libs() {
616 [[ $# -eq 0 ]] && return 0
617 local flag
618 for flag in "$@"; do
619 if [[ -z "${flag// }" ]]; then
620 eqawarn "Appending an empty argument to LIBS is invalid! Skipping."
621 continue
622 fi
623 case $flag in
624 -[lL]*)
625 export LIBS="${LIBS} ${flag}"
626 ;;
627 -*)
628 eqawarn "Appending non-library to LIBS (${flag}); Other linker flags should be passed via LDFLAGS"
629 export LIBS="${LIBS} ${flag}"
630 ;;
631 *)
632 export LIBS="${LIBS} -l${flag}"
633 esac
634 done
635
636 return 0
637 }
638
639 # @FUNCTION: raw-ldflags
640 # @USAGE: [flags]
641 # @DESCRIPTION:
642 # Turn C style ldflags (-Wl,-foo) into straight ldflags - the results
643 # are suitable for passing directly to 'ld'; note LDFLAGS is usually passed
644 # to gcc where it needs the '-Wl,'.
645 #
646 # If no flags are specified, then default to ${LDFLAGS}.
647 raw-ldflags() {
648 local x input="$@"
649 [[ -z ${input} ]] && input=${LDFLAGS}
650 set --
651 for x in ${input} ; do
652 case ${x} in
653 -Wl,*)
654 x=${x#-Wl,}
655 set -- "$@" ${x//,/ }
656 ;;
657 *) # Assume it's a compiler driver flag, so throw it away #441808
658 ;;
659 esac
660 done
661 echo "$@"
662 }
663
664 # @FUNCTION: no-as-needed
665 # @RETURN: Flag to disable asneeded behavior for use with append-ldflags.
666 no-as-needed() {
667 case $($(tc-getLD) -v 2>&1 </dev/null) in
668 *GNU*) # GNU ld
669 echo "-Wl,--no-as-needed" ;;
670 esac
671 }
672
673 fi

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