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Revision 1.111 - (show annotations) (download)
Sat Oct 14 20:27:21 2006 UTC (7 years, 10 months ago) by swegener
Branch: MAIN
Changes since 1.110: +3 -3 lines
Apply whitespace checks from repoman to eclasses.

1 # Copyright 1999-2006 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 1.110 2006/08/01 00:49:16 vapier Exp $
4 #
5 # Maintainer: base-system@gentoo.org
6
7 # need access to emktemp()
8 inherit eutils toolchain-funcs multilib
9
10 #
11 #### filter-flags <flags> ####
12 # Remove particular flags from C[XX]FLAGS
13 # Matches only complete flags
14 #
15 #### append-flags <flags> ####
16 # Add extra flags to your current C[XX]FLAGS
17 #
18 #### replace-flags <orig.flag> <new.flag> ###
19 # Replace a flag by another one
20 #
21 #### replace-cpu-flags <old.cpus> <new.cpu> ###
22 # Replace march/mcpu flags that specify <old.cpus>
23 # with flags that specify <new.cpu>
24 #
25 #### is-flag[q] <flag> ####
26 # Returns "true" if flag is set in C[XX]FLAGS
27 # Matches only complete a flag
28 # q version sets return code but doesn't echo
29 #
30 #### is-ldflag[q] <flag> ####
31 # Returns "true" if flag is set in LDFLAGS
32 # Matches only complete a flag
33 # q version sets return code but doesn't echo
34 #
35 #### strip-flags ####
36 # Strip C[XX]FLAGS of everything except known
37 # good options.
38 #
39 #### strip-unsupported-flags ####
40 # Strip C[XX]FLAGS of any flags not supported by
41 # installed version of gcc
42 #
43 #### get-flag <flag> ####
44 # Find and echo the value for a particular flag
45 #
46 #### replace-sparc64-flags ####
47 # Sets mcpu to v8 and uses the original value
48 # as mtune if none specified.
49 #
50 #### filter-mfpmath <math types> ####
51 # Remove specified math types from the fpmath specification
52 # If the user has -mfpmath=sse,386, running `filter-mfpmath sse`
53 # will leave the user with -mfpmath=386
54 #
55 #### append-ldflags ####
56 # Add extra flags to your current LDFLAGS
57 #
58 #### filter-ldflags <flags> ####
59 # Remove particular flags from LDFLAGS
60 # Matches only complete flags
61 #
62 #### bindnow-flags ####
63 # Returns the flags to enable "now" binding in the current selected linker.
64 #
65 ################ DEPRECATED functions ################
66 # The following are still present to avoid breaking existing
67 # code more than necessary; however they are deprecated. Please
68 # use gcc-specs-* from toolchain-funcs.eclass instead, if you
69 # need to know which hardened techs are active in the compiler.
70 # See bug #100974
71 #
72 #### has_hardened ####
73 # Returns true if the compiler has 'Hardened' in its version string,
74 # (note; switched-spec vanilla compilers satisfy this condition) or
75 # the specs file name contains 'hardened'.
76 #
77 #### has_pie ####
78 # Returns true if the compiler by default or with current CFLAGS
79 # builds position-independent code.
80 #
81 #### has_pic ####
82 # Returns true if the compiler by default or with current CFLAGS
83 # builds position-independent code.
84 #
85 #### has_ssp_all ####
86 # Returns true if the compiler by default or with current CFLAGS
87 # generates stack smash protections for all functions
88 #
89 #### has_ssp ####
90 # Returns true if the compiler by default or with current CFLAGS
91 # generates stack smash protections for most vulnerable functions
92 #
93
94 # C[XX]FLAGS that we allow in strip-flags
95 setup-allowed-flags() {
96 if [[ -z ${ALLOWED_FLAGS} ]] ; then
97 export ALLOWED_FLAGS="-pipe"
98 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -O -O0 -O1 -O2 -mcpu -march -mtune"
99 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -fstack-protector -fstack-protector-all"
100 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -fbounds-checking -fno-bounds-checking"
101 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -fno-PIE -fno-pie -fno-unit-at-a-time"
102 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -g -g0 -g1 -g2 -g3 -ggdb -ggdb0 -ggdb1 -ggdb2 -ggdb3"
103 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -fno-ident"
104 fi
105 # allow a bunch of flags that negate features / control ABI
106 ALLOWED_FLAGS="${ALLOWED_FLAGS} -fno-stack-protector -fno-stack-protector-all"
107 ALLOWED_FLAGS="${ALLOWED_FLAGS} -mregparm -mno-app-regs -mapp-regs \
108 -mno-mmx -mno-sse -mno-sse2 -mno-sse3 -mno-3dnow \
109 -mips1 -mips2 -mips3 -mips4 -mips32 -mips64 -mips16 \
110 -msoft-float -mno-soft-float -mhard-float -mno-hard-float -mfpu \
111 -mieee -mieee-with-inexact -mschedule \
112 -mtls-direct-seg-refs -mno-tls-direct-seg-refs \
113 -mflat -mno-flat -mno-faster-structs -mfaster-structs \
114 -m32 -m64 -mabi -mlittle-endian -mbig-endian -EL -EB -fPIC \
115 -mlive-g0 -mcmodel -mstack-bias -mno-stack-bias"
116
117 # C[XX]FLAGS that we are think is ok, but needs testing
118 # NOTE: currently -Os have issues with gcc3 and K6* arch's
119 export UNSTABLE_FLAGS="-Os -O3 -freorder-blocks"
120 return 0
121 }
122
123 # inverted filters for hardened compiler. This is trying to unpick
124 # the hardened compiler defaults.
125 _filter-hardened() {
126 local f
127 for f in "$@" ; do
128 case "${f}" in
129 # Ideally we should only concern ourselves with PIE flags,
130 # not -fPIC or -fpic, but too many places filter -fPIC without
131 # thinking about -fPIE.
132 -fPIC|-fpic|-fPIE|-fpie|-Wl,pie|-pie)
133 gcc-specs-pie || continue
134 is-flagq -nopie || append-flags -nopie;;
135 -fstack-protector)
136 gcc-specs-ssp || continue
137 is-flagq -fno-stack-protector || append-flags -fno-stack-protector;;
138 -fstack-protector-all)
139 gcc-specs-ssp-to-all || continue
140 is-flagq -fno-stack-protector-all || append-flags -fno-stack-protector-all;;
141 esac
142 done
143 }
144
145 # Remove occurrences of strings from variable given in $1
146 # Strings removed are matched as globs, so for example
147 # '-O*' would remove -O1, -O2 etc.
148 _filter-var() {
149 local f x VAR VAL
150 declare -a new
151
152 VAR=$1
153 shift
154 eval VAL=\${${VAR}}
155 for f in ${VAL}; do
156 for x in "$@"; do
157 # Note this should work with globs like -O*
158 [[ ${f} == ${x} ]] && continue 2
159 done
160 eval new\[\${\#new\[@]}]=\${f}
161 done
162 eval export ${VAR}=\${new\[*]}
163 }
164
165 filter-flags() {
166 _filter-hardened "$@"
167 _filter-var CFLAGS "$@"
168 _filter-var CXXFLAGS "$@"
169 return 0
170 }
171
172 filter-lfs-flags() {
173 [[ -n $@ ]] && die "filter-lfs-flags takes no arguments"
174 filter-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
175 }
176
177 append-lfs-flags() {
178 [[ -n $@ ]] && die "append-lfs-flags takes no arguments"
179 append-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
180 }
181
182 append-flags() {
183 [[ -z $* ]] && return 0
184 export CFLAGS="${CFLAGS} $*"
185 export CXXFLAGS="${CXXFLAGS} $*"
186 return 0
187 }
188
189 replace-flags() {
190 [[ $# != 2 ]] \
191 && echo && eerror "Usage: replace-flags <old flag> <new flag>" \
192 && die "replace-flags takes 2 arguments, not $#"
193
194 local f fset
195 declare -a new_CFLAGS new_CXXFLAGS
196
197 for fset in CFLAGS CXXFLAGS; do
198 # Looping over the flags instead of using a global
199 # substitution ensures that we're working with flag atoms.
200 # Otherwise globs like -O* have the potential to wipe out the
201 # list of flags.
202 for f in ${!fset}; do
203 # Note this should work with globs like -O*
204 [[ ${f} == ${1} ]] && f=${2}
205 eval new_${fset}\[\${\#new_${fset}\[@]}]=\${f}
206 done
207 eval export ${fset}=\${new_${fset}\[*]}
208 done
209
210 return 0
211 }
212
213 replace-cpu-flags() {
214 local newcpu="$#" ; newcpu="${!newcpu}"
215 while [ $# -gt 1 ] ; do
216 # quote to make sure that no globbing is done (particularly on
217 # ${oldcpu} prior to calling replace-flags
218 replace-flags "-march=${1}" "-march=${newcpu}"
219 replace-flags "-mcpu=${1}" "-mcpu=${newcpu}"
220 replace-flags "-mtune=${1}" "-mtune=${newcpu}"
221 shift
222 done
223 return 0
224 }
225
226 is-flagq() {
227 local x
228
229 for x in ${CFLAGS} ${CXXFLAGS} ; do
230 # Note this should work with globs like -mcpu=ultrasparc*
231 if [[ ${x} == ${1} ]]; then
232 return 0
233 fi
234 done
235 return 1
236 }
237
238 is-flag() {
239 if is-flagq ${1}; then
240 echo true
241 return 0
242 fi
243 return 1
244 }
245
246 is-ldflagq() {
247 local x
248
249 for x in ${LDFLAGS} ; do
250 # Note this should work with globs like -mcpu=ultrasparc*
251 if [[ ${x} == ${1} ]]; then
252 return 0
253 fi
254 done
255 return 1
256 }
257
258 is-ldflag() {
259 if is-ldflagq ${1}; then
260 echo true
261 return 0
262 fi
263 return 1
264 }
265
266 filter-mfpmath() {
267 local orig_mfpmath new_math prune_math
268
269 # save the original -mfpmath flag
270 orig_mfpmath=$(get-flag -mfpmath)
271 # get the value of the current -mfpmath flag
272 new_math=$(get-flag mfpmath)
273 new_math=" ${new_math//,/ } "
274 # figure out which math values are to be removed
275 prune_math=""
276 for prune_math in "$@" ; do
277 new_math=${new_math/ ${prune_math} / }
278 done
279 new_math=$(echo ${new_math})
280 new_math=${new_math// /,}
281
282 if [[ -z ${new_math} ]] ; then
283 # if we're removing all user specified math values are
284 # slated for removal, then we just filter the flag
285 filter-flags ${orig_mfpmath}
286 else
287 # if we only want to filter some of the user specified
288 # math values, then we replace the current flag
289 replace-flags ${orig_mfpmath} -mfpmath=${new_math}
290 fi
291 return 0
292 }
293
294 strip-flags() {
295 local x y flag NEW_CFLAGS NEW_CXXFLAGS
296
297 setup-allowed-flags
298
299 local NEW_CFLAGS=""
300 local NEW_CXXFLAGS=""
301
302 # Allow unstable C[XX]FLAGS if we are using unstable profile ...
303 if has ~$(tc-arch) ${ACCEPT_KEYWORDS} ; then
304 ALLOWED_FLAGS="${ALLOWED_FLAGS} ${UNSTABLE_FLAGS}"
305 fi
306
307 set -f # disable pathname expansion
308
309 for x in ${CFLAGS}; do
310 for y in ${ALLOWED_FLAGS}; do
311 flag=${x%%=*}
312 if [ "${flag%%${y}}" = "" ] ; then
313 NEW_CFLAGS="${NEW_CFLAGS} ${x}"
314 break
315 fi
316 done
317 done
318
319 for x in ${CXXFLAGS}; do
320 for y in ${ALLOWED_FLAGS}; do
321 flag=${x%%=*}
322 if [ "${flag%%${y}}" = "" ] ; then
323 NEW_CXXFLAGS="${NEW_CXXFLAGS} ${x}"
324 break
325 fi
326 done
327 done
328
329 # In case we filtered out all optimization flags fallback to -O2
330 if [ "${CFLAGS/-O}" != "${CFLAGS}" -a "${NEW_CFLAGS/-O}" = "${NEW_CFLAGS}" ]; then
331 NEW_CFLAGS="${NEW_CFLAGS} -O2"
332 fi
333 if [ "${CXXFLAGS/-O}" != "${CXXFLAGS}" -a "${NEW_CXXFLAGS/-O}" = "${NEW_CXXFLAGS}" ]; then
334 NEW_CXXFLAGS="${NEW_CXXFLAGS} -O2"
335 fi
336
337 set +f # re-enable pathname expansion
338
339 export CFLAGS="${NEW_CFLAGS}"
340 export CXXFLAGS="${NEW_CXXFLAGS}"
341 return 0
342 }
343
344 test-flag-PROG() {
345 local comp=$1
346 local flags="$2"
347
348 [[ -z ${comp} || -z ${flags} ]] && \
349 return 1
350
351 local PROG=$(tc-get${comp})
352 ${PROG} ${flags} -S -o /dev/null -xc /dev/null \
353 > /dev/null 2>&1
354 }
355
356 # Returns true if C compiler support given flag
357 test-flag-CC() { test-flag-PROG "CC" "$1"; }
358
359 # Returns true if C++ compiler support given flag
360 test-flag-CXX() { test-flag-PROG "CXX" "$1"; }
361
362 test-flags-PROG() {
363 local comp=$1
364 local flags
365 local x
366
367 shift
368
369 [[ -z ${comp} ]] && \
370 return 1
371
372 for x in "$@" ; do
373 test-flag-${comp} "${x}" && flags="${flags} ${x}"
374 done
375
376 echo "${flags}"
377
378 # Just bail if we dont have any flags
379 [[ -n ${flags} ]]
380 }
381
382 # Returns (echo's) the given flags supported by the C compiler
383 test-flags-CC() { test-flags-PROG "CC" "$@"; }
384
385 # Returns (echo's) the given flags supported by the C++ compiler
386 test-flags-CXX() { test-flags-PROG "CXX" "$@"; }
387
388 # Short-hand that should hopefully work for both C and C++ compiler, but
389 # its really only present due to the append-flags() abomination.
390 test-flags() { test-flags-CC "$@"; }
391
392 # Depriciated, use test-flags()
393 test_flag() {
394 ewarn "test_flag: deprecated, please use test-flags()!" >&2
395
396 test-flags-CC "$@"
397 }
398
399 test_version_info() {
400 if [[ $($(tc-getCC) --version 2>&1) == *$1* ]]; then
401 return 0
402 else
403 return 1
404 fi
405 }
406
407 strip-unsupported-flags() {
408 local x NEW_CFLAGS NEW_CXXFLAGS
409
410 for x in ${CFLAGS} ; do
411 NEW_CFLAGS="${NEW_CFLAGS} $(test-flags ${x})"
412 done
413 for x in ${CXXFLAGS} ; do
414 NEW_CXXFLAGS="${NEW_CXXFLAGS} $(test-flags ${x})"
415 done
416
417 export CFLAGS=${NEW_CFLAGS}
418 export CXXFLAGS=${NEW_CXXFLAGS}
419 }
420
421 get-flag() {
422 local f findflag="$1"
423
424 # this code looks a little flaky but seems to work for
425 # everything we want ...
426 # for example, if CFLAGS="-march=i686":
427 # `get-flag -march` == "-march=i686"
428 # `get-flag march` == "i686"
429 for f in ${CFLAGS} ${CXXFLAGS} ; do
430 if [ "${f/${findflag}}" != "${f}" ] ; then
431 printf "%s\n" "${f/-${findflag}=}"
432 return 0
433 fi
434 done
435 return 1
436 }
437
438 # DEPRECATED - use gcc-specs-relro or gcc-specs-now from toolchain-funcs
439 has_hardened() {
440 ewarn "has_hardened: deprecated, please use gcc-specs-{relro,now}()!" >&2
441
442 test_version_info Hardened && return 0
443 # The specs file wont exist unless gcc has GCC_SPECS support
444 [[ -f ${GCC_SPECS} && ${GCC_SPECS} != ${GCC_SPECS/hardened/} ]]
445 }
446
447 # DEPRECATED - use gcc-specs-pie from toolchain-funcs
448 # indicate whether PIC is set
449 has_pic() {
450 ewarn "has_pic: deprecated, please use gcc-specs-pie()!" >&2
451
452 [[ ${CFLAGS/-fPIC} != ${CFLAGS} || \
453 ${CFLAGS/-fpic} != ${CFLAGS} ]] || \
454 gcc-specs-pie
455 }
456
457 # DEPRECATED - use gcc-specs-pie from toolchain-funcs
458 # indicate whether PIE is set
459 has_pie() {
460 ewarn "has_pie: deprecated, please use gcc-specs-pie()!" >&2
461
462 [[ ${CFLAGS/-fPIE} != ${CFLAGS} || \
463 ${CFLAGS/-fpie} != ${CFLAGS} ]] || \
464 gcc-specs-pie
465 }
466
467 # DEPRECATED - use gcc-specs-ssp from toolchain-funcs
468 # indicate whether code for SSP is being generated for all functions
469 has_ssp_all() {
470 ewarn "has_ssp_all: deprecated, please use gcc-specs-ssp()!" >&2
471
472 # note; this matches only -fstack-protector-all
473 [[ ${CFLAGS/-fstack-protector-all} != ${CFLAGS} || \
474 -n $(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __SSP_ALL__) ]] || \
475 gcc-specs-ssp-all
476 }
477
478 # DEPRECATED - use gcc-specs-ssp from toolchain-funcs
479 # indicate whether code for SSP is being generated
480 has_ssp() {
481 ewarn "has_ssp: deprecated, please use gcc-specs-ssp()!" >&2
482
483 # note; this matches both -fstack-protector and -fstack-protector-all
484 [[ ${CFLAGS/-fstack-protector} != ${CFLAGS} || \
485 -n $(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __SSP__) ]] || \
486 gcc-specs-ssp
487 }
488
489 has_m64() {
490 # this doesnt test if the flag is accepted, it tests if the flag
491 # actually -WORKS-. non-multilib gcc will take both -m32 and -m64!
492 # please dont replace this function with test_flag in some future
493 # clean-up!
494
495 local temp="$(emktemp)"
496 echo "int main() { return(0); }" > "${temp}".c
497 MY_CC=$(tc-getCC)
498 ${MY_CC/ .*/} -m64 -o "$(emktemp)" "${temp}".c > /dev/null 2>&1
499 local ret=$?
500 rm -f "${temp}".c
501 [[ ${ret} != 1 ]] && return 0
502 return 1
503 }
504
505 has_m32() {
506 # this doesnt test if the flag is accepted, it tests if the flag
507 # actually -WORKS-. non-multilib gcc will take both -m32 and -m64!
508 # please dont replace this function with test_flag in some future
509 # clean-up!
510
511 [ "$(tc-arch)" = "amd64" ] && has_multilib_profile && return 0
512
513 local temp=$(emktemp)
514 echo "int main() { return(0); }" > "${temp}".c
515 MY_CC=$(tc-getCC)
516 ${MY_CC/ .*/} -m32 -o "$(emktemp)" "${temp}".c > /dev/null 2>&1
517 local ret=$?
518 rm -f "${temp}".c
519 [[ ${ret} != 1 ]] && return 0
520 return 1
521 }
522
523 replace-sparc64-flags() {
524 local SPARC64_CPUS="ultrasparc3 ultrasparc v9"
525
526 if [ "${CFLAGS/mtune}" != "${CFLAGS}" ]; then
527 for x in ${SPARC64_CPUS}; do
528 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8}"
529 done
530 else
531 for x in ${SPARC64_CPUS}; do
532 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
533 done
534 fi
535
536 if [ "${CXXFLAGS/mtune}" != "${CXXFLAGS}" ]; then
537 for x in ${SPARC64_CPUS}; do
538 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8}"
539 done
540 else
541 for x in ${SPARC64_CPUS}; do
542 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
543 done
544 fi
545
546 export CFLAGS CXXFLAGS
547 }
548
549 append-ldflags() {
550 [[ -z $* ]] && return 0
551 export LDFLAGS="${LDFLAGS} $*"
552 return 0
553 }
554
555 # Remove flags from LDFLAGS - it's up to the ebuild to filter
556 # CFLAGS and CXXFLAGS via filter-flags if they need to.
557 filter-ldflags() {
558 _filter-var LDFLAGS "$@"
559 return 0
560 }
561
562 # Turn C style ldflags (-Wl,-foo) into straight ldflags - the results
563 # are suitable for passing directly to 'ld'; note LDFLAGS is usually passed
564 # to gcc where it needs the '-Wl,'.
565 raw-ldflags() {
566 local x input="$@"
567 [[ -z ${input} ]] && input=${LDFLAGS}
568 set --
569 for x in ${input} ; do
570 x=${x#-Wl,}
571 set -- "$@" ${x//,/ }
572 done
573 echo "$@"
574 }
575
576 # This is thanks to great work from Paul de Vrieze <gentoo-user@devrieze.net>,
577 # bug #9016. Also thanks to Jukka Salmi <salmi@gmx.net> (bug #13907) for more
578 # fixes.
579 #
580 # Export CFLAGS and CXXFLAGS that are compadible with gcc-2.95.3
581 gcc2-flags() {
582 if [[ $(tc-arch) == "x86" || $(tc-arch) == "amd64" ]] ; then
583 CFLAGS=${CFLAGS//-mtune=/-mcpu=}
584 CXXFLAGS=${CXXFLAGS//-mtune=/-mcpu=}
585 fi
586
587 replace-cpu-flags k6-{2,3} k6
588 replace-cpu-flags athlon{,-{tbird,4,xp,mp}} i686
589
590 replace-cpu-flags pentium-mmx i586
591 replace-cpu-flags pentium{2,3,4} i686
592
593 replace-cpu-flags ev6{7,8} ev6
594
595 export CFLAGS CXXFLAGS
596 }
597
598 # Gets the flags needed for "NOW" binding
599 bindnow-flags() {
600 case $($(tc-getLD) -v 2>&1 </dev/null) in
601 *GNU* | *'with BFD'*) # GNU ld
602 echo "-Wl,-z,now" ;;
603 *Apple*) # Darwin ld
604 echo "-bind_at_load" ;;
605 *)
606 # Some linkers just recognize -V instead of -v
607 case $($(tc-getLD) -V 2>&1 </dev/null) in
608 *Solaris*) # Solaris accept almost the same GNU options
609 echo "-Wl,-z,now" ;;
610 esac
611 ;;
612 esac
613 }

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