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Revision 1.120 - (show annotations) (download)
Sun Jul 22 08:21:09 2007 UTC (7 years, 2 months ago) by dberkholz
Branch: MAIN
Changes since 1.119: +2 -1 lines
Add -W* and -w to ALLOWED_FLAGS.

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 1.119 2007/05/12 11:45:51 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"
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="${ALLOWED_FLAGS} -fno-ident"
105 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -W* -w"
106 fi
107 # allow a bunch of flags that negate features / control ABI
108 ALLOWED_FLAGS="${ALLOWED_FLAGS} -fno-stack-protector -fno-stack-protector-all \
109 -fno-strict-aliasing -fno-bounds-checking"
110 ALLOWED_FLAGS="${ALLOWED_FLAGS} -mregparm -mno-app-regs -mapp-regs \
111 -mno-mmx -mno-sse -mno-sse2 -mno-sse3 -mno-3dnow \
112 -mips1 -mips2 -mips3 -mips4 -mips32 -mips64 -mips16 \
113 -msoft-float -mno-soft-float -mhard-float -mno-hard-float -mfpu \
114 -mieee -mieee-with-inexact -mschedule \
115 -mtls-direct-seg-refs -mno-tls-direct-seg-refs \
116 -mflat -mno-flat -mno-faster-structs -mfaster-structs \
117 -m32 -m64 -mabi -mlittle-endian -mbig-endian -EL -EB -fPIC \
118 -mlive-g0 -mcmodel -mstack-bias -mno-stack-bias \
119 -msecure-plt -D*"
120
121 # C[XX]FLAGS that we are think is ok, but needs testing
122 # NOTE: currently -Os have issues with gcc3 and K6* arch's
123 export UNSTABLE_FLAGS="-Os -O3 -freorder-blocks"
124 return 0
125 }
126
127 # inverted filters for hardened compiler. This is trying to unpick
128 # the hardened compiler defaults.
129 _filter-hardened() {
130 local f
131 for f in "$@" ; do
132 case "${f}" in
133 # Ideally we should only concern ourselves with PIE flags,
134 # not -fPIC or -fpic, but too many places filter -fPIC without
135 # thinking about -fPIE.
136 -fPIC|-fpic|-fPIE|-fpie|-Wl,pie|-pie)
137 gcc-specs-pie || continue
138 is-flagq -nopie || append-flags -nopie;;
139 -fstack-protector)
140 gcc-specs-ssp || continue
141 is-flagq -fno-stack-protector || append-flags -fno-stack-protector;;
142 -fstack-protector-all)
143 gcc-specs-ssp-to-all || continue
144 is-flagq -fno-stack-protector-all || append-flags -fno-stack-protector-all;;
145 esac
146 done
147 }
148
149 # Remove occurrences of strings from variable given in $1
150 # Strings removed are matched as globs, so for example
151 # '-O*' would remove -O1, -O2 etc.
152 _filter-var() {
153 local f x VAR VAL
154 declare -a new
155
156 VAR=$1
157 shift
158 eval VAL=\${${VAR}}
159 for f in ${VAL}; do
160 for x in "$@"; do
161 # Note this should work with globs like -O*
162 [[ ${f} == ${x} ]] && continue 2
163 done
164 eval new\[\${\#new\[@]}]=\${f}
165 done
166 eval export ${VAR}=\${new\[*]}
167 }
168
169 filter-flags() {
170 _filter-hardened "$@"
171 _filter-var CFLAGS "$@"
172 _filter-var CPPFLAGS "$@"
173 _filter-var CXXFLAGS "$@"
174 return 0
175 }
176
177 filter-lfs-flags() {
178 [[ -n $@ ]] && die "filter-lfs-flags takes no arguments"
179 filter-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
180 }
181
182 append-cppflags() {
183 [[ -z $* ]] && return 0
184 export CPPFLAGS="${CPPFLAGS} $*"
185 return 0
186 }
187
188 append-lfs-flags() {
189 [[ -n $@ ]] && die "append-lfs-flags takes no arguments"
190 append-cppflags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
191 }
192
193 append-flags() {
194 [[ -z $* ]] && return 0
195 export CFLAGS="${CFLAGS} $*"
196 export CXXFLAGS="${CXXFLAGS} $*"
197 return 0
198 }
199
200 replace-flags() {
201 [[ $# != 2 ]] \
202 && echo && eerror "Usage: replace-flags <old flag> <new flag>" \
203 && die "replace-flags takes 2 arguments, not $#"
204
205 local f fset
206 declare -a new_CFLAGS new_CXXFLAGS
207
208 for fset in CFLAGS CXXFLAGS; do
209 # Looping over the flags instead of using a global
210 # substitution ensures that we're working with flag atoms.
211 # Otherwise globs like -O* have the potential to wipe out the
212 # list of flags.
213 for f in ${!fset}; do
214 # Note this should work with globs like -O*
215 [[ ${f} == ${1} ]] && f=${2}
216 eval new_${fset}\[\${\#new_${fset}\[@]}]=\${f}
217 done
218 eval export ${fset}=\${new_${fset}\[*]}
219 done
220
221 return 0
222 }
223
224 replace-cpu-flags() {
225 local newcpu="$#" ; newcpu="${!newcpu}"
226 while [ $# -gt 1 ] ; do
227 # quote to make sure that no globbing is done (particularly on
228 # ${oldcpu}) prior to calling replace-flags
229 replace-flags "-march=${1}" "-march=${newcpu}"
230 replace-flags "-mcpu=${1}" "-mcpu=${newcpu}"
231 replace-flags "-mtune=${1}" "-mtune=${newcpu}"
232 shift
233 done
234 return 0
235 }
236
237 _is_flagq() {
238 local x
239 for x in ${!1} ; do
240 [[ ${x} == $2 ]] && return 0
241 done
242 return 1
243 }
244
245 is-flagq() {
246 [[ -n $2 ]] && die "Usage: is-flag <flag>"
247 _is_flagq CFLAGS $1 || _is_flagq CXXFLAGS $1
248 }
249
250 is-flag() {
251 is-flagq "$@" && echo true
252 }
253
254 is-ldflagq() {
255 [[ -n $2 ]] && die "Usage: is-ldflag <flag>"
256 _is_flagq LDFLAGS $1
257 }
258
259 is-ldflag() {
260 is-ldflagq "$@" && echo true
261 }
262
263 filter-mfpmath() {
264 local orig_mfpmath new_math prune_math
265
266 # save the original -mfpmath flag
267 orig_mfpmath=$(get-flag -mfpmath)
268 # get the value of the current -mfpmath flag
269 new_math=$(get-flag mfpmath)
270 new_math=" ${new_math//,/ } "
271 # figure out which math values are to be removed
272 prune_math=""
273 for prune_math in "$@" ; do
274 new_math=${new_math/ ${prune_math} / }
275 done
276 new_math=$(echo ${new_math})
277 new_math=${new_math// /,}
278
279 if [[ -z ${new_math} ]] ; then
280 # if we're removing all user specified math values are
281 # slated for removal, then we just filter the flag
282 filter-flags ${orig_mfpmath}
283 else
284 # if we only want to filter some of the user specified
285 # math values, then we replace the current flag
286 replace-flags ${orig_mfpmath} -mfpmath=${new_math}
287 fi
288 return 0
289 }
290
291 strip-flags() {
292 local x y flag NEW_CFLAGS NEW_CXXFLAGS
293
294 setup-allowed-flags
295
296 local NEW_CFLAGS=""
297 local NEW_CXXFLAGS=""
298
299 # Allow unstable C[XX]FLAGS if we are using unstable profile ...
300 if has ~$(tc-arch) ${ACCEPT_KEYWORDS} ; then
301 ALLOWED_FLAGS="${ALLOWED_FLAGS} ${UNSTABLE_FLAGS}"
302 fi
303
304 set -f # disable pathname expansion
305
306 for x in ${CFLAGS}; do
307 for y in ${ALLOWED_FLAGS}; do
308 flag=${x%%=*}
309 if [ "${flag%%${y}}" = "" ] ; then
310 NEW_CFLAGS="${NEW_CFLAGS} ${x}"
311 break
312 fi
313 done
314 done
315
316 for x in ${CXXFLAGS}; do
317 for y in ${ALLOWED_FLAGS}; do
318 flag=${x%%=*}
319 if [ "${flag%%${y}}" = "" ] ; then
320 NEW_CXXFLAGS="${NEW_CXXFLAGS} ${x}"
321 break
322 fi
323 done
324 done
325
326 # In case we filtered out all optimization flags fallback to -O2
327 if [ "${CFLAGS/-O}" != "${CFLAGS}" -a "${NEW_CFLAGS/-O}" = "${NEW_CFLAGS}" ]; then
328 NEW_CFLAGS="${NEW_CFLAGS} -O2"
329 fi
330 if [ "${CXXFLAGS/-O}" != "${CXXFLAGS}" -a "${NEW_CXXFLAGS/-O}" = "${NEW_CXXFLAGS}" ]; then
331 NEW_CXXFLAGS="${NEW_CXXFLAGS} -O2"
332 fi
333
334 set +f # re-enable pathname expansion
335
336 export CFLAGS="${NEW_CFLAGS}"
337 export CXXFLAGS="${NEW_CXXFLAGS}"
338 return 0
339 }
340
341 test-flag-PROG() {
342 local comp=$1
343 local flags="$2"
344
345 [[ -z ${comp} || -z ${flags} ]] && \
346 return 1
347
348 local PROG=$(tc-get${comp})
349 ${PROG} ${flags} -S -o /dev/null -xc /dev/null \
350 > /dev/null 2>&1
351 }
352
353 # Returns true if C compiler support given flag
354 test-flag-CC() { test-flag-PROG "CC" "$1"; }
355
356 # Returns true if C++ compiler support given flag
357 test-flag-CXX() { test-flag-PROG "CXX" "$1"; }
358
359 test-flags-PROG() {
360 local comp=$1
361 local flags
362 local x
363
364 shift
365
366 [[ -z ${comp} ]] && return 1
367
368 x=""
369 for x in "$@" ; do
370 test-flag-${comp} "${x}" && flags="${flags}${flags:+ }${x}"
371 done
372
373 echo "${flags}"
374
375 # Just bail if we dont have any flags
376 [[ -n ${flags} ]]
377 }
378
379 # Returns (echo's) the given flags supported by the C compiler
380 test-flags-CC() { test-flags-PROG "CC" "$@"; }
381
382 # Returns (echo's) the given flags supported by the C++ compiler
383 test-flags-CXX() { test-flags-PROG "CXX" "$@"; }
384
385 # Short-hand that should hopefully work for both C and C++ compiler, but
386 # its really only present due to the append-flags() abomination.
387 test-flags() { test-flags-CC "$@"; }
388
389 # Depriciated, use test-flags()
390 test_flag() {
391 ewarn "test_flag: deprecated, please use test-flags()!" >&2
392
393 test-flags-CC "$@"
394 }
395
396 test_version_info() {
397 if [[ $($(tc-getCC) --version 2>&1) == *$1* ]]; then
398 return 0
399 else
400 return 1
401 fi
402 }
403
404 strip-unsupported-flags() {
405 export CFLAGS=$(test-flags-CC ${CFLAGS})
406 export CXXFLAGS=$(test-flags-CXX ${CXXFLAGS})
407 }
408
409 get-flag() {
410 local f findflag="$1"
411
412 # this code looks a little flaky but seems to work for
413 # everything we want ...
414 # for example, if CFLAGS="-march=i686":
415 # `get-flag -march` == "-march=i686"
416 # `get-flag march` == "i686"
417 for f in ${CFLAGS} ${CXXFLAGS} ; do
418 if [ "${f/${findflag}}" != "${f}" ] ; then
419 printf "%s\n" "${f/-${findflag}=}"
420 return 0
421 fi
422 done
423 return 1
424 }
425
426 # DEPRECATED - use gcc-specs-relro or gcc-specs-now from toolchain-funcs
427 has_hardened() {
428 ewarn "has_hardened: deprecated, please use gcc-specs-{relro,now}()!" >&2
429
430 test_version_info Hardened && return 0
431 # The specs file wont exist unless gcc has GCC_SPECS support
432 [[ -f ${GCC_SPECS} && ${GCC_SPECS} != ${GCC_SPECS/hardened/} ]]
433 }
434
435 # DEPRECATED - use gcc-specs-pie from toolchain-funcs
436 # indicate whether PIC is set
437 has_pic() {
438 ewarn "has_pic: deprecated, please use gcc-specs-pie()!" >&2
439
440 [[ ${CFLAGS/-fPIC} != ${CFLAGS} || \
441 ${CFLAGS/-fpic} != ${CFLAGS} ]] || \
442 gcc-specs-pie
443 }
444
445 # DEPRECATED - use gcc-specs-pie from toolchain-funcs
446 # indicate whether PIE is set
447 has_pie() {
448 ewarn "has_pie: deprecated, please use gcc-specs-pie()!" >&2
449
450 [[ ${CFLAGS/-fPIE} != ${CFLAGS} || \
451 ${CFLAGS/-fpie} != ${CFLAGS} ]] || \
452 gcc-specs-pie
453 }
454
455 # DEPRECATED - use gcc-specs-ssp from toolchain-funcs
456 # indicate whether code for SSP is being generated for all functions
457 has_ssp_all() {
458 ewarn "has_ssp_all: deprecated, please use gcc-specs-ssp()!" >&2
459
460 # note; this matches only -fstack-protector-all
461 [[ ${CFLAGS/-fstack-protector-all} != ${CFLAGS} || \
462 -n $(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __SSP_ALL__) ]] || \
463 gcc-specs-ssp-all
464 }
465
466 # DEPRECATED - use gcc-specs-ssp from toolchain-funcs
467 # indicate whether code for SSP is being generated
468 has_ssp() {
469 ewarn "has_ssp: deprecated, please use gcc-specs-ssp()!" >&2
470
471 # note; this matches both -fstack-protector and -fstack-protector-all
472 [[ ${CFLAGS/-fstack-protector} != ${CFLAGS} || \
473 -n $(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __SSP__) ]] || \
474 gcc-specs-ssp
475 }
476
477 has_m64() {
478 # this doesnt test if the flag is accepted, it tests if the flag
479 # actually -WORKS-. non-multilib gcc will take both -m32 and -m64!
480 # please dont replace this function with test_flag in some future
481 # clean-up!
482
483 local temp="$(emktemp)"
484 echo "int main() { return(0); }" > "${temp}".c
485 MY_CC=$(tc-getCC)
486 ${MY_CC/ .*/} -m64 -o "$(emktemp)" "${temp}".c > /dev/null 2>&1
487 local ret=$?
488 rm -f "${temp}".c
489 [[ ${ret} != 1 ]] && return 0
490 return 1
491 }
492
493 has_m32() {
494 # this doesnt test if the flag is accepted, it tests if the flag
495 # actually -WORKS-. non-multilib gcc will take both -m32 and -m64!
496 # please dont replace this function with test_flag in some future
497 # clean-up!
498
499 [ "$(tc-arch)" = "amd64" ] && has_multilib_profile && return 0
500
501 local temp=$(emktemp)
502 echo "int main() { return(0); }" > "${temp}".c
503 MY_CC=$(tc-getCC)
504 ${MY_CC/ .*/} -m32 -o "$(emktemp)" "${temp}".c > /dev/null 2>&1
505 local ret=$?
506 rm -f "${temp}".c
507 [[ ${ret} != 1 ]] && return 0
508 return 1
509 }
510
511 replace-sparc64-flags() {
512 local SPARC64_CPUS="ultrasparc3 ultrasparc v9"
513
514 if [ "${CFLAGS/mtune}" != "${CFLAGS}" ]; then
515 for x in ${SPARC64_CPUS}; do
516 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8}"
517 done
518 else
519 for x in ${SPARC64_CPUS}; do
520 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
521 done
522 fi
523
524 if [ "${CXXFLAGS/mtune}" != "${CXXFLAGS}" ]; then
525 for x in ${SPARC64_CPUS}; do
526 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8}"
527 done
528 else
529 for x in ${SPARC64_CPUS}; do
530 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
531 done
532 fi
533
534 export CFLAGS CXXFLAGS
535 }
536
537 append-ldflags() {
538 [[ -z $* ]] && return 0
539 export LDFLAGS="${LDFLAGS} $*"
540 return 0
541 }
542
543 # Remove flags from LDFLAGS - it's up to the ebuild to filter
544 # CFLAGS and CXXFLAGS via filter-flags if they need to.
545 filter-ldflags() {
546 _filter-var LDFLAGS "$@"
547 return 0
548 }
549
550 # Turn C style ldflags (-Wl,-foo) into straight ldflags - the results
551 # are suitable for passing directly to 'ld'; note LDFLAGS is usually passed
552 # to gcc where it needs the '-Wl,'.
553 raw-ldflags() {
554 local x input="$@"
555 [[ -z ${input} ]] && input=${LDFLAGS}
556 set --
557 for x in ${input} ; do
558 x=${x#-Wl,}
559 set -- "$@" ${x//,/ }
560 done
561 echo "$@"
562 }
563
564 # Gets the flags needed for "NOW" binding
565 bindnow-flags() {
566 case $($(tc-getLD) -v 2>&1 </dev/null) in
567 *GNU* | *'with BFD'*) # GNU ld
568 echo "-Wl,-z,now" ;;
569 *Apple*) # Darwin ld
570 echo "-bind_at_load" ;;
571 *)
572 # Some linkers just recognize -V instead of -v
573 case $($(tc-getLD) -V 2>&1 </dev/null) in
574 *Solaris*) # Solaris accept almost the same GNU options
575 echo "-Wl,-z,now" ;;
576 esac
577 ;;
578 esac
579 }
580
581
582 # Some tests for when we screw with things and want to make
583 # sure we didn't break anything
584 #TESTS() {
585 # CFLAGS="-a -b -c=1"
586 # CXXFLAGS="-x -y -z=2"
587 # LDFLAGS="-l -m -n=3"
588 #
589 # die() { exit 1; }
590 # (is-flag 1 2 3) && die
591 # (is-ldflag 1 2 3) && die
592 #
593 # is-flagq -l && die
594 # is-ldflagq -a && die
595 # is-flagq -a || die
596 # is-flagq -x || die
597 # is-ldflagq -n=* || die
598 # is-ldflagq -n && die
599 #
600 # strip-unsupported-flags
601 # [[ ${CFLAGS} == "-c=1" ]] || die
602 # [[ ${CXXFLAGS} == "-y -z=2" ]] || die
603 #
604 # echo "All tests pass"
605 #}
606 #TESTS

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