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Revision 1.118 - (show annotations) (download)
Sat Mar 24 07:07:18 2007 UTC (7 years, 9 months ago) by vapier
Branch: MAIN
Changes since 1.117: +9 -2 lines
add new function append-cppflags and support CPPFLAGS a little better

1 # Copyright 1999-2007 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 1.117 2007/03/04 21:13:17 vapier Exp $
4 #
5 # Maintainer: toolchain@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 # Note: shell globs and character lists are allowed
96 setup-allowed-flags() {
97 if [[ -z ${ALLOWED_FLAGS} ]] ; then
98 export ALLOWED_FLAGS="-pipe"
99 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -O -O0 -O1 -O2 -mcpu -march -mtune"
100 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -fstack-protector -fstack-protector-all"
101 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -fbounds-checking -fno-bounds-checking"
102 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -fno-PIE -fno-pie -fno-unit-at-a-time"
103 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -g -g[0-9] -ggdb -ggdb[0-9] -gstabs -gstabs+"
104 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -fno-ident"
105 fi
106 # allow a bunch of flags that negate features / control ABI
107 ALLOWED_FLAGS="${ALLOWED_FLAGS} -fno-stack-protector -fno-stack-protector-all"
108 ALLOWED_FLAGS="${ALLOWED_FLAGS} -mregparm -mno-app-regs -mapp-regs \
109 -mno-mmx -mno-sse -mno-sse2 -mno-sse3 -mno-3dnow \
110 -mips1 -mips2 -mips3 -mips4 -mips32 -mips64 -mips16 \
111 -msoft-float -mno-soft-float -mhard-float -mno-hard-float -mfpu \
112 -mieee -mieee-with-inexact -mschedule \
113 -mtls-direct-seg-refs -mno-tls-direct-seg-refs \
114 -mflat -mno-flat -mno-faster-structs -mfaster-structs \
115 -m32 -m64 -mabi -mlittle-endian -mbig-endian -EL -EB -fPIC \
116 -mlive-g0 -mcmodel -mstack-bias -mno-stack-bias \
117 -msecure-plt -D*"
118
119 # C[XX]FLAGS that we are think is ok, but needs testing
120 # NOTE: currently -Os have issues with gcc3 and K6* arch's
121 export UNSTABLE_FLAGS="-Os -O3 -freorder-blocks"
122 return 0
123 }
124
125 # inverted filters for hardened compiler. This is trying to unpick
126 # the hardened compiler defaults.
127 _filter-hardened() {
128 local f
129 for f in "$@" ; do
130 case "${f}" in
131 # Ideally we should only concern ourselves with PIE flags,
132 # not -fPIC or -fpic, but too many places filter -fPIC without
133 # thinking about -fPIE.
134 -fPIC|-fpic|-fPIE|-fpie|-Wl,pie|-pie)
135 gcc-specs-pie || continue
136 is-flagq -nopie || append-flags -nopie;;
137 -fstack-protector)
138 gcc-specs-ssp || continue
139 is-flagq -fno-stack-protector || append-flags -fno-stack-protector;;
140 -fstack-protector-all)
141 gcc-specs-ssp-to-all || continue
142 is-flagq -fno-stack-protector-all || append-flags -fno-stack-protector-all;;
143 esac
144 done
145 }
146
147 # Remove occurrences of strings from variable given in $1
148 # Strings removed are matched as globs, so for example
149 # '-O*' would remove -O1, -O2 etc.
150 _filter-var() {
151 local f x VAR VAL
152 declare -a new
153
154 VAR=$1
155 shift
156 eval VAL=\${${VAR}}
157 for f in ${VAL}; do
158 for x in "$@"; do
159 # Note this should work with globs like -O*
160 [[ ${f} == ${x} ]] && continue 2
161 done
162 eval new\[\${\#new\[@]}]=\${f}
163 done
164 eval export ${VAR}=\${new\[*]}
165 }
166
167 filter-flags() {
168 _filter-hardened "$@"
169 _filter-var CFLAGS "$@"
170 _filter-var CPPFLAGS "$@"
171 _filter-var CXXFLAGS "$@"
172 return 0
173 }
174
175 filter-lfs-flags() {
176 [[ -n $@ ]] && die "filter-lfs-flags takes no arguments"
177 filter-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
178 }
179
180 append-cppflags() {
181 [[ -z $* ]] && return 0
182 export CPPFLAGS="${CPPFLAGS} $*"
183 return 0
184 }
185
186 append-lfs-flags() {
187 [[ -n $@ ]] && die "append-lfs-flags takes no arguments"
188 append-cppflags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
189 }
190
191 append-flags() {
192 [[ -z $* ]] && return 0
193 export CFLAGS="${CFLAGS} $*"
194 export CXXFLAGS="${CXXFLAGS} $*"
195 return 0
196 }
197
198 replace-flags() {
199 [[ $# != 2 ]] \
200 && echo && eerror "Usage: replace-flags <old flag> <new flag>" \
201 && die "replace-flags takes 2 arguments, not $#"
202
203 local f fset
204 declare -a new_CFLAGS new_CXXFLAGS
205
206 for fset in CFLAGS CXXFLAGS; do
207 # Looping over the flags instead of using a global
208 # substitution ensures that we're working with flag atoms.
209 # Otherwise globs like -O* have the potential to wipe out the
210 # list of flags.
211 for f in ${!fset}; do
212 # Note this should work with globs like -O*
213 [[ ${f} == ${1} ]] && f=${2}
214 eval new_${fset}\[\${\#new_${fset}\[@]}]=\${f}
215 done
216 eval export ${fset}=\${new_${fset}\[*]}
217 done
218
219 return 0
220 }
221
222 replace-cpu-flags() {
223 local newcpu="$#" ; newcpu="${!newcpu}"
224 while [ $# -gt 1 ] ; do
225 # quote to make sure that no globbing is done (particularly on
226 # ${oldcpu}) prior to calling replace-flags
227 replace-flags "-march=${1}" "-march=${newcpu}"
228 replace-flags "-mcpu=${1}" "-mcpu=${newcpu}"
229 replace-flags "-mtune=${1}" "-mtune=${newcpu}"
230 shift
231 done
232 return 0
233 }
234
235 _is_flagq() {
236 local x
237 for x in ${!1} ; do
238 [[ ${x} == $2 ]] && return 0
239 done
240 return 1
241 }
242
243 is-flagq() {
244 [[ -n $2 ]] && die "Usage: is-flag <flag>"
245 _is_flagq CFLAGS $1 || _is_flagq CXXFLAGS $1
246 }
247
248 is-flag() {
249 is-flagq "$@" && echo true
250 }
251
252 is-ldflagq() {
253 [[ -n $2 ]] && die "Usage: is-ldflag <flag>"
254 _is_flagq LDFLAGS $1
255 }
256
257 is-ldflag() {
258 is-ldflagq "$@" && echo true
259 }
260
261 filter-mfpmath() {
262 local orig_mfpmath new_math prune_math
263
264 # save the original -mfpmath flag
265 orig_mfpmath=$(get-flag -mfpmath)
266 # get the value of the current -mfpmath flag
267 new_math=$(get-flag mfpmath)
268 new_math=" ${new_math//,/ } "
269 # figure out which math values are to be removed
270 prune_math=""
271 for prune_math in "$@" ; do
272 new_math=${new_math/ ${prune_math} / }
273 done
274 new_math=$(echo ${new_math})
275 new_math=${new_math// /,}
276
277 if [[ -z ${new_math} ]] ; then
278 # if we're removing all user specified math values are
279 # slated for removal, then we just filter the flag
280 filter-flags ${orig_mfpmath}
281 else
282 # if we only want to filter some of the user specified
283 # math values, then we replace the current flag
284 replace-flags ${orig_mfpmath} -mfpmath=${new_math}
285 fi
286 return 0
287 }
288
289 strip-flags() {
290 local x y flag NEW_CFLAGS NEW_CXXFLAGS
291
292 setup-allowed-flags
293
294 local NEW_CFLAGS=""
295 local NEW_CXXFLAGS=""
296
297 # Allow unstable C[XX]FLAGS if we are using unstable profile ...
298 if has ~$(tc-arch) ${ACCEPT_KEYWORDS} ; then
299 ALLOWED_FLAGS="${ALLOWED_FLAGS} ${UNSTABLE_FLAGS}"
300 fi
301
302 set -f # disable pathname expansion
303
304 for x in ${CFLAGS}; do
305 for y in ${ALLOWED_FLAGS}; do
306 flag=${x%%=*}
307 if [ "${flag%%${y}}" = "" ] ; then
308 NEW_CFLAGS="${NEW_CFLAGS} ${x}"
309 break
310 fi
311 done
312 done
313
314 for x in ${CXXFLAGS}; do
315 for y in ${ALLOWED_FLAGS}; do
316 flag=${x%%=*}
317 if [ "${flag%%${y}}" = "" ] ; then
318 NEW_CXXFLAGS="${NEW_CXXFLAGS} ${x}"
319 break
320 fi
321 done
322 done
323
324 # In case we filtered out all optimization flags fallback to -O2
325 if [ "${CFLAGS/-O}" != "${CFLAGS}" -a "${NEW_CFLAGS/-O}" = "${NEW_CFLAGS}" ]; then
326 NEW_CFLAGS="${NEW_CFLAGS} -O2"
327 fi
328 if [ "${CXXFLAGS/-O}" != "${CXXFLAGS}" -a "${NEW_CXXFLAGS/-O}" = "${NEW_CXXFLAGS}" ]; then
329 NEW_CXXFLAGS="${NEW_CXXFLAGS} -O2"
330 fi
331
332 set +f # re-enable pathname expansion
333
334 export CFLAGS="${NEW_CFLAGS}"
335 export CXXFLAGS="${NEW_CXXFLAGS}"
336 return 0
337 }
338
339 test-flag-PROG() {
340 local comp=$1
341 local flags="$2"
342
343 [[ -z ${comp} || -z ${flags} ]] && \
344 return 1
345
346 local PROG=$(tc-get${comp})
347 ${PROG} ${flags} -S -o /dev/null -xc /dev/null \
348 > /dev/null 2>&1
349 }
350
351 # Returns true if C compiler support given flag
352 test-flag-CC() { test-flag-PROG "CC" "$1"; }
353
354 # Returns true if C++ compiler support given flag
355 test-flag-CXX() { test-flag-PROG "CXX" "$1"; }
356
357 test-flags-PROG() {
358 local comp=$1
359 local flags
360 local x
361
362 shift
363
364 [[ -z ${comp} ]] && return 1
365
366 x=""
367 for x in "$@" ; do
368 test-flag-${comp} "${x}" && flags="${flags}${flags:+ }${x}"
369 done
370
371 echo "${flags}"
372
373 # Just bail if we dont have any flags
374 [[ -n ${flags} ]]
375 }
376
377 # Returns (echo's) the given flags supported by the C compiler
378 test-flags-CC() { test-flags-PROG "CC" "$@"; }
379
380 # Returns (echo's) the given flags supported by the C++ compiler
381 test-flags-CXX() { test-flags-PROG "CXX" "$@"; }
382
383 # Short-hand that should hopefully work for both C and C++ compiler, but
384 # its really only present due to the append-flags() abomination.
385 test-flags() { test-flags-CC "$@"; }
386
387 # Depriciated, use test-flags()
388 test_flag() {
389 ewarn "test_flag: deprecated, please use test-flags()!" >&2
390
391 test-flags-CC "$@"
392 }
393
394 test_version_info() {
395 if [[ $($(tc-getCC) --version 2>&1) == *$1* ]]; then
396 return 0
397 else
398 return 1
399 fi
400 }
401
402 strip-unsupported-flags() {
403 export CFLAGS=$(test-flags-CC ${CFLAGS})
404 export CXXFLAGS=$(test-flags-CXX ${CXXFLAGS})
405 }
406
407 get-flag() {
408 local f findflag="$1"
409
410 # this code looks a little flaky but seems to work for
411 # everything we want ...
412 # for example, if CFLAGS="-march=i686":
413 # `get-flag -march` == "-march=i686"
414 # `get-flag march` == "i686"
415 for f in ${CFLAGS} ${CXXFLAGS} ; do
416 if [ "${f/${findflag}}" != "${f}" ] ; then
417 printf "%s\n" "${f/-${findflag}=}"
418 return 0
419 fi
420 done
421 return 1
422 }
423
424 # DEPRECATED - use gcc-specs-relro or gcc-specs-now from toolchain-funcs
425 has_hardened() {
426 ewarn "has_hardened: deprecated, please use gcc-specs-{relro,now}()!" >&2
427
428 test_version_info Hardened && return 0
429 # The specs file wont exist unless gcc has GCC_SPECS support
430 [[ -f ${GCC_SPECS} && ${GCC_SPECS} != ${GCC_SPECS/hardened/} ]]
431 }
432
433 # DEPRECATED - use gcc-specs-pie from toolchain-funcs
434 # indicate whether PIC is set
435 has_pic() {
436 ewarn "has_pic: deprecated, please use gcc-specs-pie()!" >&2
437
438 [[ ${CFLAGS/-fPIC} != ${CFLAGS} || \
439 ${CFLAGS/-fpic} != ${CFLAGS} ]] || \
440 gcc-specs-pie
441 }
442
443 # DEPRECATED - use gcc-specs-pie from toolchain-funcs
444 # indicate whether PIE is set
445 has_pie() {
446 ewarn "has_pie: deprecated, please use gcc-specs-pie()!" >&2
447
448 [[ ${CFLAGS/-fPIE} != ${CFLAGS} || \
449 ${CFLAGS/-fpie} != ${CFLAGS} ]] || \
450 gcc-specs-pie
451 }
452
453 # DEPRECATED - use gcc-specs-ssp from toolchain-funcs
454 # indicate whether code for SSP is being generated for all functions
455 has_ssp_all() {
456 ewarn "has_ssp_all: deprecated, please use gcc-specs-ssp()!" >&2
457
458 # note; this matches only -fstack-protector-all
459 [[ ${CFLAGS/-fstack-protector-all} != ${CFLAGS} || \
460 -n $(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __SSP_ALL__) ]] || \
461 gcc-specs-ssp-all
462 }
463
464 # DEPRECATED - use gcc-specs-ssp from toolchain-funcs
465 # indicate whether code for SSP is being generated
466 has_ssp() {
467 ewarn "has_ssp: deprecated, please use gcc-specs-ssp()!" >&2
468
469 # note; this matches both -fstack-protector and -fstack-protector-all
470 [[ ${CFLAGS/-fstack-protector} != ${CFLAGS} || \
471 -n $(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __SSP__) ]] || \
472 gcc-specs-ssp
473 }
474
475 has_m64() {
476 # this doesnt test if the flag is accepted, it tests if the flag
477 # actually -WORKS-. non-multilib gcc will take both -m32 and -m64!
478 # please dont replace this function with test_flag in some future
479 # clean-up!
480
481 local temp="$(emktemp)"
482 echo "int main() { return(0); }" > "${temp}".c
483 MY_CC=$(tc-getCC)
484 ${MY_CC/ .*/} -m64 -o "$(emktemp)" "${temp}".c > /dev/null 2>&1
485 local ret=$?
486 rm -f "${temp}".c
487 [[ ${ret} != 1 ]] && return 0
488 return 1
489 }
490
491 has_m32() {
492 # this doesnt test if the flag is accepted, it tests if the flag
493 # actually -WORKS-. non-multilib gcc will take both -m32 and -m64!
494 # please dont replace this function with test_flag in some future
495 # clean-up!
496
497 [ "$(tc-arch)" = "amd64" ] && has_multilib_profile && return 0
498
499 local temp=$(emktemp)
500 echo "int main() { return(0); }" > "${temp}".c
501 MY_CC=$(tc-getCC)
502 ${MY_CC/ .*/} -m32 -o "$(emktemp)" "${temp}".c > /dev/null 2>&1
503 local ret=$?
504 rm -f "${temp}".c
505 [[ ${ret} != 1 ]] && return 0
506 return 1
507 }
508
509 replace-sparc64-flags() {
510 local SPARC64_CPUS="ultrasparc3 ultrasparc v9"
511
512 if [ "${CFLAGS/mtune}" != "${CFLAGS}" ]; then
513 for x in ${SPARC64_CPUS}; do
514 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8}"
515 done
516 else
517 for x in ${SPARC64_CPUS}; do
518 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
519 done
520 fi
521
522 if [ "${CXXFLAGS/mtune}" != "${CXXFLAGS}" ]; then
523 for x in ${SPARC64_CPUS}; do
524 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8}"
525 done
526 else
527 for x in ${SPARC64_CPUS}; do
528 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
529 done
530 fi
531
532 export CFLAGS CXXFLAGS
533 }
534
535 append-ldflags() {
536 [[ -z $* ]] && return 0
537 export LDFLAGS="${LDFLAGS} $*"
538 return 0
539 }
540
541 # Remove flags from LDFLAGS - it's up to the ebuild to filter
542 # CFLAGS and CXXFLAGS via filter-flags if they need to.
543 filter-ldflags() {
544 _filter-var LDFLAGS "$@"
545 return 0
546 }
547
548 # Turn C style ldflags (-Wl,-foo) into straight ldflags - the results
549 # are suitable for passing directly to 'ld'; note LDFLAGS is usually passed
550 # to gcc where it needs the '-Wl,'.
551 raw-ldflags() {
552 local x input="$@"
553 [[ -z ${input} ]] && input=${LDFLAGS}
554 set --
555 for x in ${input} ; do
556 x=${x#-Wl,}
557 set -- "$@" ${x//,/ }
558 done
559 echo "$@"
560 }
561
562 # Gets the flags needed for "NOW" binding
563 bindnow-flags() {
564 case $($(tc-getLD) -v 2>&1 </dev/null) in
565 *GNU* | *'with BFD'*) # GNU ld
566 echo "-Wl,-z,now" ;;
567 *Apple*) # Darwin ld
568 echo "-bind_at_load" ;;
569 *)
570 # Some linkers just recognize -V instead of -v
571 case $($(tc-getLD) -V 2>&1 </dev/null) in
572 *Solaris*) # Solaris accept almost the same GNU options
573 echo "-Wl,-z,now" ;;
574 esac
575 ;;
576 esac
577 }
578
579
580 # Some tests for when we screw with things and want to make
581 # sure we didn't break anything
582 #TESTS() {
583 # CFLAGS="-a -b -c=1"
584 # CXXFLAGS="-x -y -z=2"
585 # LDFLAGS="-l -m -n=3"
586 #
587 # die() { exit 1; }
588 # (is-flag 1 2 3) && die
589 # (is-ldflag 1 2 3) && die
590 #
591 # is-flagq -l && die
592 # is-ldflagq -a && die
593 # is-flagq -a || die
594 # is-flagq -x || die
595 # is-ldflagq -n=* || die
596 # is-ldflagq -n && die
597 #
598 # strip-unsupported-flags
599 # [[ ${CFLAGS} == "-c=1" ]] || die
600 # [[ ${CXXFLAGS} == "-y -z=2" ]] || die
601 #
602 # echo "All tests pass"
603 #}
604 #TESTS

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