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Revision 1.119 - (show annotations) (download)
Sat May 12 11:45:51 2007 UTC (6 years, 11 months ago) by vapier
Branch: MAIN
Changes since 1.118: +4 -3 lines
allow -fno-strict-aliasing in strip-flags as pointed out by nyhm

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 1.118 2007/03/24 07:07:18 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="${ALLOWED_FLAGS} -fno-ident"
105 fi
106 # allow a bunch of flags that negate features / control ABI
107 ALLOWED_FLAGS="${ALLOWED_FLAGS} -fno-stack-protector -fno-stack-protector-all \
108 -fno-strict-aliasing -fno-bounds-checking"
109 ALLOWED_FLAGS="${ALLOWED_FLAGS} -mregparm -mno-app-regs -mapp-regs \
110 -mno-mmx -mno-sse -mno-sse2 -mno-sse3 -mno-3dnow \
111 -mips1 -mips2 -mips3 -mips4 -mips32 -mips64 -mips16 \
112 -msoft-float -mno-soft-float -mhard-float -mno-hard-float -mfpu \
113 -mieee -mieee-with-inexact -mschedule \
114 -mtls-direct-seg-refs -mno-tls-direct-seg-refs \
115 -mflat -mno-flat -mno-faster-structs -mfaster-structs \
116 -m32 -m64 -mabi -mlittle-endian -mbig-endian -EL -EB -fPIC \
117 -mlive-g0 -mcmodel -mstack-bias -mno-stack-bias \
118 -msecure-plt -D*"
119
120 # C[XX]FLAGS that we are think is ok, but needs testing
121 # NOTE: currently -Os have issues with gcc3 and K6* arch's
122 export UNSTABLE_FLAGS="-Os -O3 -freorder-blocks"
123 return 0
124 }
125
126 # inverted filters for hardened compiler. This is trying to unpick
127 # the hardened compiler defaults.
128 _filter-hardened() {
129 local f
130 for f in "$@" ; do
131 case "${f}" in
132 # Ideally we should only concern ourselves with PIE flags,
133 # not -fPIC or -fpic, but too many places filter -fPIC without
134 # thinking about -fPIE.
135 -fPIC|-fpic|-fPIE|-fpie|-Wl,pie|-pie)
136 gcc-specs-pie || continue
137 is-flagq -nopie || append-flags -nopie;;
138 -fstack-protector)
139 gcc-specs-ssp || continue
140 is-flagq -fno-stack-protector || append-flags -fno-stack-protector;;
141 -fstack-protector-all)
142 gcc-specs-ssp-to-all || continue
143 is-flagq -fno-stack-protector-all || append-flags -fno-stack-protector-all;;
144 esac
145 done
146 }
147
148 # Remove occurrences of strings from variable given in $1
149 # Strings removed are matched as globs, so for example
150 # '-O*' would remove -O1, -O2 etc.
151 _filter-var() {
152 local f x VAR VAL
153 declare -a new
154
155 VAR=$1
156 shift
157 eval VAL=\${${VAR}}
158 for f in ${VAL}; do
159 for x in "$@"; do
160 # Note this should work with globs like -O*
161 [[ ${f} == ${x} ]] && continue 2
162 done
163 eval new\[\${\#new\[@]}]=\${f}
164 done
165 eval export ${VAR}=\${new\[*]}
166 }
167
168 filter-flags() {
169 _filter-hardened "$@"
170 _filter-var CFLAGS "$@"
171 _filter-var CPPFLAGS "$@"
172 _filter-var CXXFLAGS "$@"
173 return 0
174 }
175
176 filter-lfs-flags() {
177 [[ -n $@ ]] && die "filter-lfs-flags takes no arguments"
178 filter-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
179 }
180
181 append-cppflags() {
182 [[ -z $* ]] && return 0
183 export CPPFLAGS="${CPPFLAGS} $*"
184 return 0
185 }
186
187 append-lfs-flags() {
188 [[ -n $@ ]] && die "append-lfs-flags takes no arguments"
189 append-cppflags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
190 }
191
192 append-flags() {
193 [[ -z $* ]] && return 0
194 export CFLAGS="${CFLAGS} $*"
195 export CXXFLAGS="${CXXFLAGS} $*"
196 return 0
197 }
198
199 replace-flags() {
200 [[ $# != 2 ]] \
201 && echo && eerror "Usage: replace-flags <old flag> <new flag>" \
202 && die "replace-flags takes 2 arguments, not $#"
203
204 local f fset
205 declare -a new_CFLAGS new_CXXFLAGS
206
207 for fset in CFLAGS CXXFLAGS; do
208 # Looping over the flags instead of using a global
209 # substitution ensures that we're working with flag atoms.
210 # Otherwise globs like -O* have the potential to wipe out the
211 # list of flags.
212 for f in ${!fset}; do
213 # Note this should work with globs like -O*
214 [[ ${f} == ${1} ]] && f=${2}
215 eval new_${fset}\[\${\#new_${fset}\[@]}]=\${f}
216 done
217 eval export ${fset}=\${new_${fset}\[*]}
218 done
219
220 return 0
221 }
222
223 replace-cpu-flags() {
224 local newcpu="$#" ; newcpu="${!newcpu}"
225 while [ $# -gt 1 ] ; do
226 # quote to make sure that no globbing is done (particularly on
227 # ${oldcpu}) prior to calling replace-flags
228 replace-flags "-march=${1}" "-march=${newcpu}"
229 replace-flags "-mcpu=${1}" "-mcpu=${newcpu}"
230 replace-flags "-mtune=${1}" "-mtune=${newcpu}"
231 shift
232 done
233 return 0
234 }
235
236 _is_flagq() {
237 local x
238 for x in ${!1} ; do
239 [[ ${x} == $2 ]] && return 0
240 done
241 return 1
242 }
243
244 is-flagq() {
245 [[ -n $2 ]] && die "Usage: is-flag <flag>"
246 _is_flagq CFLAGS $1 || _is_flagq CXXFLAGS $1
247 }
248
249 is-flag() {
250 is-flagq "$@" && echo true
251 }
252
253 is-ldflagq() {
254 [[ -n $2 ]] && die "Usage: is-ldflag <flag>"
255 _is_flagq LDFLAGS $1
256 }
257
258 is-ldflag() {
259 is-ldflagq "$@" && echo true
260 }
261
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 strip-flags() {
291 local x y flag NEW_CFLAGS NEW_CXXFLAGS
292
293 setup-allowed-flags
294
295 local NEW_CFLAGS=""
296 local NEW_CXXFLAGS=""
297
298 # Allow unstable C[XX]FLAGS if we are using unstable profile ...
299 if has ~$(tc-arch) ${ACCEPT_KEYWORDS} ; then
300 ALLOWED_FLAGS="${ALLOWED_FLAGS} ${UNSTABLE_FLAGS}"
301 fi
302
303 set -f # disable pathname expansion
304
305 for x in ${CFLAGS}; do
306 for y in ${ALLOWED_FLAGS}; do
307 flag=${x%%=*}
308 if [ "${flag%%${y}}" = "" ] ; then
309 NEW_CFLAGS="${NEW_CFLAGS} ${x}"
310 break
311 fi
312 done
313 done
314
315 for x in ${CXXFLAGS}; do
316 for y in ${ALLOWED_FLAGS}; do
317 flag=${x%%=*}
318 if [ "${flag%%${y}}" = "" ] ; then
319 NEW_CXXFLAGS="${NEW_CXXFLAGS} ${x}"
320 break
321 fi
322 done
323 done
324
325 # In case we filtered out all optimization flags fallback to -O2
326 if [ "${CFLAGS/-O}" != "${CFLAGS}" -a "${NEW_CFLAGS/-O}" = "${NEW_CFLAGS}" ]; then
327 NEW_CFLAGS="${NEW_CFLAGS} -O2"
328 fi
329 if [ "${CXXFLAGS/-O}" != "${CXXFLAGS}" -a "${NEW_CXXFLAGS/-O}" = "${NEW_CXXFLAGS}" ]; then
330 NEW_CXXFLAGS="${NEW_CXXFLAGS} -O2"
331 fi
332
333 set +f # re-enable pathname expansion
334
335 export CFLAGS="${NEW_CFLAGS}"
336 export CXXFLAGS="${NEW_CXXFLAGS}"
337 return 0
338 }
339
340 test-flag-PROG() {
341 local comp=$1
342 local flags="$2"
343
344 [[ -z ${comp} || -z ${flags} ]] && \
345 return 1
346
347 local PROG=$(tc-get${comp})
348 ${PROG} ${flags} -S -o /dev/null -xc /dev/null \
349 > /dev/null 2>&1
350 }
351
352 # Returns true if C compiler support given flag
353 test-flag-CC() { test-flag-PROG "CC" "$1"; }
354
355 # Returns true if C++ compiler support given flag
356 test-flag-CXX() { test-flag-PROG "CXX" "$1"; }
357
358 test-flags-PROG() {
359 local comp=$1
360 local flags
361 local x
362
363 shift
364
365 [[ -z ${comp} ]] && return 1
366
367 x=""
368 for x in "$@" ; do
369 test-flag-${comp} "${x}" && flags="${flags}${flags:+ }${x}"
370 done
371
372 echo "${flags}"
373
374 # Just bail if we dont have any flags
375 [[ -n ${flags} ]]
376 }
377
378 # Returns (echo's) the given flags supported by the C compiler
379 test-flags-CC() { test-flags-PROG "CC" "$@"; }
380
381 # Returns (echo's) the given flags supported by the C++ compiler
382 test-flags-CXX() { test-flags-PROG "CXX" "$@"; }
383
384 # Short-hand that should hopefully work for both C and C++ compiler, but
385 # its really only present due to the append-flags() abomination.
386 test-flags() { test-flags-CC "$@"; }
387
388 # Depriciated, use test-flags()
389 test_flag() {
390 ewarn "test_flag: deprecated, please use test-flags()!" >&2
391
392 test-flags-CC "$@"
393 }
394
395 test_version_info() {
396 if [[ $($(tc-getCC) --version 2>&1) == *$1* ]]; then
397 return 0
398 else
399 return 1
400 fi
401 }
402
403 strip-unsupported-flags() {
404 export CFLAGS=$(test-flags-CC ${CFLAGS})
405 export CXXFLAGS=$(test-flags-CXX ${CXXFLAGS})
406 }
407
408 get-flag() {
409 local f findflag="$1"
410
411 # this code looks a little flaky but seems to work for
412 # everything we want ...
413 # for example, if CFLAGS="-march=i686":
414 # `get-flag -march` == "-march=i686"
415 # `get-flag march` == "i686"
416 for f in ${CFLAGS} ${CXXFLAGS} ; do
417 if [ "${f/${findflag}}" != "${f}" ] ; then
418 printf "%s\n" "${f/-${findflag}=}"
419 return 0
420 fi
421 done
422 return 1
423 }
424
425 # DEPRECATED - use gcc-specs-relro or gcc-specs-now from toolchain-funcs
426 has_hardened() {
427 ewarn "has_hardened: deprecated, please use gcc-specs-{relro,now}()!" >&2
428
429 test_version_info Hardened && return 0
430 # The specs file wont exist unless gcc has GCC_SPECS support
431 [[ -f ${GCC_SPECS} && ${GCC_SPECS} != ${GCC_SPECS/hardened/} ]]
432 }
433
434 # DEPRECATED - use gcc-specs-pie from toolchain-funcs
435 # indicate whether PIC is set
436 has_pic() {
437 ewarn "has_pic: deprecated, please use gcc-specs-pie()!" >&2
438
439 [[ ${CFLAGS/-fPIC} != ${CFLAGS} || \
440 ${CFLAGS/-fpic} != ${CFLAGS} ]] || \
441 gcc-specs-pie
442 }
443
444 # DEPRECATED - use gcc-specs-pie from toolchain-funcs
445 # indicate whether PIE is set
446 has_pie() {
447 ewarn "has_pie: deprecated, please use gcc-specs-pie()!" >&2
448
449 [[ ${CFLAGS/-fPIE} != ${CFLAGS} || \
450 ${CFLAGS/-fpie} != ${CFLAGS} ]] || \
451 gcc-specs-pie
452 }
453
454 # DEPRECATED - use gcc-specs-ssp from toolchain-funcs
455 # indicate whether code for SSP is being generated for all functions
456 has_ssp_all() {
457 ewarn "has_ssp_all: deprecated, please use gcc-specs-ssp()!" >&2
458
459 # note; this matches only -fstack-protector-all
460 [[ ${CFLAGS/-fstack-protector-all} != ${CFLAGS} || \
461 -n $(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __SSP_ALL__) ]] || \
462 gcc-specs-ssp-all
463 }
464
465 # DEPRECATED - use gcc-specs-ssp from toolchain-funcs
466 # indicate whether code for SSP is being generated
467 has_ssp() {
468 ewarn "has_ssp: deprecated, please use gcc-specs-ssp()!" >&2
469
470 # note; this matches both -fstack-protector and -fstack-protector-all
471 [[ ${CFLAGS/-fstack-protector} != ${CFLAGS} || \
472 -n $(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __SSP__) ]] || \
473 gcc-specs-ssp
474 }
475
476 has_m64() {
477 # this doesnt test if the flag is accepted, it tests if the flag
478 # actually -WORKS-. non-multilib gcc will take both -m32 and -m64!
479 # please dont replace this function with test_flag in some future
480 # clean-up!
481
482 local temp="$(emktemp)"
483 echo "int main() { return(0); }" > "${temp}".c
484 MY_CC=$(tc-getCC)
485 ${MY_CC/ .*/} -m64 -o "$(emktemp)" "${temp}".c > /dev/null 2>&1
486 local ret=$?
487 rm -f "${temp}".c
488 [[ ${ret} != 1 ]] && return 0
489 return 1
490 }
491
492 has_m32() {
493 # this doesnt test if the flag is accepted, it tests if the flag
494 # actually -WORKS-. non-multilib gcc will take both -m32 and -m64!
495 # please dont replace this function with test_flag in some future
496 # clean-up!
497
498 [ "$(tc-arch)" = "amd64" ] && has_multilib_profile && return 0
499
500 local temp=$(emktemp)
501 echo "int main() { return(0); }" > "${temp}".c
502 MY_CC=$(tc-getCC)
503 ${MY_CC/ .*/} -m32 -o "$(emktemp)" "${temp}".c > /dev/null 2>&1
504 local ret=$?
505 rm -f "${temp}".c
506 [[ ${ret} != 1 ]] && return 0
507 return 1
508 }
509
510 replace-sparc64-flags() {
511 local SPARC64_CPUS="ultrasparc3 ultrasparc v9"
512
513 if [ "${CFLAGS/mtune}" != "${CFLAGS}" ]; then
514 for x in ${SPARC64_CPUS}; do
515 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8}"
516 done
517 else
518 for x in ${SPARC64_CPUS}; do
519 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
520 done
521 fi
522
523 if [ "${CXXFLAGS/mtune}" != "${CXXFLAGS}" ]; then
524 for x in ${SPARC64_CPUS}; do
525 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8}"
526 done
527 else
528 for x in ${SPARC64_CPUS}; do
529 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
530 done
531 fi
532
533 export CFLAGS CXXFLAGS
534 }
535
536 append-ldflags() {
537 [[ -z $* ]] && return 0
538 export LDFLAGS="${LDFLAGS} $*"
539 return 0
540 }
541
542 # Remove flags from LDFLAGS - it's up to the ebuild to filter
543 # CFLAGS and CXXFLAGS via filter-flags if they need to.
544 filter-ldflags() {
545 _filter-var LDFLAGS "$@"
546 return 0
547 }
548
549 # Turn C style ldflags (-Wl,-foo) into straight ldflags - the results
550 # are suitable for passing directly to 'ld'; note LDFLAGS is usually passed
551 # to gcc where it needs the '-Wl,'.
552 raw-ldflags() {
553 local x input="$@"
554 [[ -z ${input} ]] && input=${LDFLAGS}
555 set --
556 for x in ${input} ; do
557 x=${x#-Wl,}
558 set -- "$@" ${x//,/ }
559 done
560 echo "$@"
561 }
562
563 # Gets the flags needed for "NOW" binding
564 bindnow-flags() {
565 case $($(tc-getLD) -v 2>&1 </dev/null) in
566 *GNU* | *'with BFD'*) # GNU ld
567 echo "-Wl,-z,now" ;;
568 *Apple*) # Darwin ld
569 echo "-bind_at_load" ;;
570 *)
571 # Some linkers just recognize -V instead of -v
572 case $($(tc-getLD) -V 2>&1 </dev/null) in
573 *Solaris*) # Solaris accept almost the same GNU options
574 echo "-Wl,-z,now" ;;
575 esac
576 ;;
577 esac
578 }
579
580
581 # Some tests for when we screw with things and want to make
582 # sure we didn't break anything
583 #TESTS() {
584 # CFLAGS="-a -b -c=1"
585 # CXXFLAGS="-x -y -z=2"
586 # LDFLAGS="-l -m -n=3"
587 #
588 # die() { exit 1; }
589 # (is-flag 1 2 3) && die
590 # (is-ldflag 1 2 3) && die
591 #
592 # is-flagq -l && die
593 # is-ldflagq -a && die
594 # is-flagq -a || die
595 # is-flagq -x || die
596 # is-ldflagq -n=* || die
597 # is-ldflagq -n && die
598 #
599 # strip-unsupported-flags
600 # [[ ${CFLAGS} == "-c=1" ]] || die
601 # [[ ${CXXFLAGS} == "-y -z=2" ]] || die
602 #
603 # echo "All tests pass"
604 #}
605 #TESTS

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