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Revision 1.117 - (show annotations) (download)
Sun Mar 4 21:13:17 2007 UTC (7 years, 4 months ago) by vapier
Branch: MAIN
Changes since 1.116: +3 -2 lines
add -gstabs to allowed flag list #169352

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 1.116 2007/03/04 21:03:59 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 CXXFLAGS "$@"
171 return 0
172 }
173
174 filter-lfs-flags() {
175 [[ -n $@ ]] && die "filter-lfs-flags takes no arguments"
176 filter-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
177 }
178
179 append-lfs-flags() {
180 [[ -n $@ ]] && die "append-lfs-flags takes no arguments"
181 append-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
182 }
183
184 append-flags() {
185 [[ -z $* ]] && return 0
186 export CFLAGS="${CFLAGS} $*"
187 export CXXFLAGS="${CXXFLAGS} $*"
188 return 0
189 }
190
191 replace-flags() {
192 [[ $# != 2 ]] \
193 && echo && eerror "Usage: replace-flags <old flag> <new flag>" \
194 && die "replace-flags takes 2 arguments, not $#"
195
196 local f fset
197 declare -a new_CFLAGS new_CXXFLAGS
198
199 for fset in CFLAGS CXXFLAGS; do
200 # Looping over the flags instead of using a global
201 # substitution ensures that we're working with flag atoms.
202 # Otherwise globs like -O* have the potential to wipe out the
203 # list of flags.
204 for f in ${!fset}; do
205 # Note this should work with globs like -O*
206 [[ ${f} == ${1} ]] && f=${2}
207 eval new_${fset}\[\${\#new_${fset}\[@]}]=\${f}
208 done
209 eval export ${fset}=\${new_${fset}\[*]}
210 done
211
212 return 0
213 }
214
215 replace-cpu-flags() {
216 local newcpu="$#" ; newcpu="${!newcpu}"
217 while [ $# -gt 1 ] ; do
218 # quote to make sure that no globbing is done (particularly on
219 # ${oldcpu}) prior to calling replace-flags
220 replace-flags "-march=${1}" "-march=${newcpu}"
221 replace-flags "-mcpu=${1}" "-mcpu=${newcpu}"
222 replace-flags "-mtune=${1}" "-mtune=${newcpu}"
223 shift
224 done
225 return 0
226 }
227
228 _is_flagq() {
229 local x
230 for x in ${!1} ; do
231 [[ ${x} == $2 ]] && return 0
232 done
233 return 1
234 }
235
236 is-flagq() {
237 [[ -n $2 ]] && die "Usage: is-flag <flag>"
238 _is_flagq CFLAGS $1 || _is_flagq CXXFLAGS $1
239 }
240
241 is-flag() {
242 is-flagq "$@" && echo true
243 }
244
245 is-ldflagq() {
246 [[ -n $2 ]] && die "Usage: is-ldflag <flag>"
247 _is_flagq LDFLAGS $1
248 }
249
250 is-ldflag() {
251 is-ldflagq "$@" && echo true
252 }
253
254 filter-mfpmath() {
255 local orig_mfpmath new_math prune_math
256
257 # save the original -mfpmath flag
258 orig_mfpmath=$(get-flag -mfpmath)
259 # get the value of the current -mfpmath flag
260 new_math=$(get-flag mfpmath)
261 new_math=" ${new_math//,/ } "
262 # figure out which math values are to be removed
263 prune_math=""
264 for prune_math in "$@" ; do
265 new_math=${new_math/ ${prune_math} / }
266 done
267 new_math=$(echo ${new_math})
268 new_math=${new_math// /,}
269
270 if [[ -z ${new_math} ]] ; then
271 # if we're removing all user specified math values are
272 # slated for removal, then we just filter the flag
273 filter-flags ${orig_mfpmath}
274 else
275 # if we only want to filter some of the user specified
276 # math values, then we replace the current flag
277 replace-flags ${orig_mfpmath} -mfpmath=${new_math}
278 fi
279 return 0
280 }
281
282 strip-flags() {
283 local x y flag NEW_CFLAGS NEW_CXXFLAGS
284
285 setup-allowed-flags
286
287 local NEW_CFLAGS=""
288 local NEW_CXXFLAGS=""
289
290 # Allow unstable C[XX]FLAGS if we are using unstable profile ...
291 if has ~$(tc-arch) ${ACCEPT_KEYWORDS} ; then
292 ALLOWED_FLAGS="${ALLOWED_FLAGS} ${UNSTABLE_FLAGS}"
293 fi
294
295 set -f # disable pathname expansion
296
297 for x in ${CFLAGS}; do
298 for y in ${ALLOWED_FLAGS}; do
299 flag=${x%%=*}
300 if [ "${flag%%${y}}" = "" ] ; then
301 NEW_CFLAGS="${NEW_CFLAGS} ${x}"
302 break
303 fi
304 done
305 done
306
307 for x in ${CXXFLAGS}; do
308 for y in ${ALLOWED_FLAGS}; do
309 flag=${x%%=*}
310 if [ "${flag%%${y}}" = "" ] ; then
311 NEW_CXXFLAGS="${NEW_CXXFLAGS} ${x}"
312 break
313 fi
314 done
315 done
316
317 # In case we filtered out all optimization flags fallback to -O2
318 if [ "${CFLAGS/-O}" != "${CFLAGS}" -a "${NEW_CFLAGS/-O}" = "${NEW_CFLAGS}" ]; then
319 NEW_CFLAGS="${NEW_CFLAGS} -O2"
320 fi
321 if [ "${CXXFLAGS/-O}" != "${CXXFLAGS}" -a "${NEW_CXXFLAGS/-O}" = "${NEW_CXXFLAGS}" ]; then
322 NEW_CXXFLAGS="${NEW_CXXFLAGS} -O2"
323 fi
324
325 set +f # re-enable pathname expansion
326
327 export CFLAGS="${NEW_CFLAGS}"
328 export CXXFLAGS="${NEW_CXXFLAGS}"
329 return 0
330 }
331
332 test-flag-PROG() {
333 local comp=$1
334 local flags="$2"
335
336 [[ -z ${comp} || -z ${flags} ]] && \
337 return 1
338
339 local PROG=$(tc-get${comp})
340 ${PROG} ${flags} -S -o /dev/null -xc /dev/null \
341 > /dev/null 2>&1
342 }
343
344 # Returns true if C compiler support given flag
345 test-flag-CC() { test-flag-PROG "CC" "$1"; }
346
347 # Returns true if C++ compiler support given flag
348 test-flag-CXX() { test-flag-PROG "CXX" "$1"; }
349
350 test-flags-PROG() {
351 local comp=$1
352 local flags
353 local x
354
355 shift
356
357 [[ -z ${comp} ]] && return 1
358
359 x=""
360 for x in "$@" ; do
361 test-flag-${comp} "${x}" && flags="${flags}${flags:+ }${x}"
362 done
363
364 echo "${flags}"
365
366 # Just bail if we dont have any flags
367 [[ -n ${flags} ]]
368 }
369
370 # Returns (echo's) the given flags supported by the C compiler
371 test-flags-CC() { test-flags-PROG "CC" "$@"; }
372
373 # Returns (echo's) the given flags supported by the C++ compiler
374 test-flags-CXX() { test-flags-PROG "CXX" "$@"; }
375
376 # Short-hand that should hopefully work for both C and C++ compiler, but
377 # its really only present due to the append-flags() abomination.
378 test-flags() { test-flags-CC "$@"; }
379
380 # Depriciated, use test-flags()
381 test_flag() {
382 ewarn "test_flag: deprecated, please use test-flags()!" >&2
383
384 test-flags-CC "$@"
385 }
386
387 test_version_info() {
388 if [[ $($(tc-getCC) --version 2>&1) == *$1* ]]; then
389 return 0
390 else
391 return 1
392 fi
393 }
394
395 strip-unsupported-flags() {
396 export CFLAGS=$(test-flags-CC ${CFLAGS})
397 export CXXFLAGS=$(test-flags-CXX ${CXXFLAGS})
398 }
399
400 get-flag() {
401 local f findflag="$1"
402
403 # this code looks a little flaky but seems to work for
404 # everything we want ...
405 # for example, if CFLAGS="-march=i686":
406 # `get-flag -march` == "-march=i686"
407 # `get-flag march` == "i686"
408 for f in ${CFLAGS} ${CXXFLAGS} ; do
409 if [ "${f/${findflag}}" != "${f}" ] ; then
410 printf "%s\n" "${f/-${findflag}=}"
411 return 0
412 fi
413 done
414 return 1
415 }
416
417 # DEPRECATED - use gcc-specs-relro or gcc-specs-now from toolchain-funcs
418 has_hardened() {
419 ewarn "has_hardened: deprecated, please use gcc-specs-{relro,now}()!" >&2
420
421 test_version_info Hardened && return 0
422 # The specs file wont exist unless gcc has GCC_SPECS support
423 [[ -f ${GCC_SPECS} && ${GCC_SPECS} != ${GCC_SPECS/hardened/} ]]
424 }
425
426 # DEPRECATED - use gcc-specs-pie from toolchain-funcs
427 # indicate whether PIC is set
428 has_pic() {
429 ewarn "has_pic: deprecated, please use gcc-specs-pie()!" >&2
430
431 [[ ${CFLAGS/-fPIC} != ${CFLAGS} || \
432 ${CFLAGS/-fpic} != ${CFLAGS} ]] || \
433 gcc-specs-pie
434 }
435
436 # DEPRECATED - use gcc-specs-pie from toolchain-funcs
437 # indicate whether PIE is set
438 has_pie() {
439 ewarn "has_pie: deprecated, please use gcc-specs-pie()!" >&2
440
441 [[ ${CFLAGS/-fPIE} != ${CFLAGS} || \
442 ${CFLAGS/-fpie} != ${CFLAGS} ]] || \
443 gcc-specs-pie
444 }
445
446 # DEPRECATED - use gcc-specs-ssp from toolchain-funcs
447 # indicate whether code for SSP is being generated for all functions
448 has_ssp_all() {
449 ewarn "has_ssp_all: deprecated, please use gcc-specs-ssp()!" >&2
450
451 # note; this matches only -fstack-protector-all
452 [[ ${CFLAGS/-fstack-protector-all} != ${CFLAGS} || \
453 -n $(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __SSP_ALL__) ]] || \
454 gcc-specs-ssp-all
455 }
456
457 # DEPRECATED - use gcc-specs-ssp from toolchain-funcs
458 # indicate whether code for SSP is being generated
459 has_ssp() {
460 ewarn "has_ssp: deprecated, please use gcc-specs-ssp()!" >&2
461
462 # note; this matches both -fstack-protector and -fstack-protector-all
463 [[ ${CFLAGS/-fstack-protector} != ${CFLAGS} || \
464 -n $(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __SSP__) ]] || \
465 gcc-specs-ssp
466 }
467
468 has_m64() {
469 # this doesnt test if the flag is accepted, it tests if the flag
470 # actually -WORKS-. non-multilib gcc will take both -m32 and -m64!
471 # please dont replace this function with test_flag in some future
472 # clean-up!
473
474 local temp="$(emktemp)"
475 echo "int main() { return(0); }" > "${temp}".c
476 MY_CC=$(tc-getCC)
477 ${MY_CC/ .*/} -m64 -o "$(emktemp)" "${temp}".c > /dev/null 2>&1
478 local ret=$?
479 rm -f "${temp}".c
480 [[ ${ret} != 1 ]] && return 0
481 return 1
482 }
483
484 has_m32() {
485 # this doesnt test if the flag is accepted, it tests if the flag
486 # actually -WORKS-. non-multilib gcc will take both -m32 and -m64!
487 # please dont replace this function with test_flag in some future
488 # clean-up!
489
490 [ "$(tc-arch)" = "amd64" ] && has_multilib_profile && return 0
491
492 local temp=$(emktemp)
493 echo "int main() { return(0); }" > "${temp}".c
494 MY_CC=$(tc-getCC)
495 ${MY_CC/ .*/} -m32 -o "$(emktemp)" "${temp}".c > /dev/null 2>&1
496 local ret=$?
497 rm -f "${temp}".c
498 [[ ${ret} != 1 ]] && return 0
499 return 1
500 }
501
502 replace-sparc64-flags() {
503 local SPARC64_CPUS="ultrasparc3 ultrasparc v9"
504
505 if [ "${CFLAGS/mtune}" != "${CFLAGS}" ]; then
506 for x in ${SPARC64_CPUS}; do
507 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8}"
508 done
509 else
510 for x in ${SPARC64_CPUS}; do
511 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
512 done
513 fi
514
515 if [ "${CXXFLAGS/mtune}" != "${CXXFLAGS}" ]; then
516 for x in ${SPARC64_CPUS}; do
517 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8}"
518 done
519 else
520 for x in ${SPARC64_CPUS}; do
521 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
522 done
523 fi
524
525 export CFLAGS CXXFLAGS
526 }
527
528 append-ldflags() {
529 [[ -z $* ]] && return 0
530 export LDFLAGS="${LDFLAGS} $*"
531 return 0
532 }
533
534 # Remove flags from LDFLAGS - it's up to the ebuild to filter
535 # CFLAGS and CXXFLAGS via filter-flags if they need to.
536 filter-ldflags() {
537 _filter-var LDFLAGS "$@"
538 return 0
539 }
540
541 # Turn C style ldflags (-Wl,-foo) into straight ldflags - the results
542 # are suitable for passing directly to 'ld'; note LDFLAGS is usually passed
543 # to gcc where it needs the '-Wl,'.
544 raw-ldflags() {
545 local x input="$@"
546 [[ -z ${input} ]] && input=${LDFLAGS}
547 set --
548 for x in ${input} ; do
549 x=${x#-Wl,}
550 set -- "$@" ${x//,/ }
551 done
552 echo "$@"
553 }
554
555 # Gets the flags needed for "NOW" binding
556 bindnow-flags() {
557 case $($(tc-getLD) -v 2>&1 </dev/null) in
558 *GNU* | *'with BFD'*) # GNU ld
559 echo "-Wl,-z,now" ;;
560 *Apple*) # Darwin ld
561 echo "-bind_at_load" ;;
562 *)
563 # Some linkers just recognize -V instead of -v
564 case $($(tc-getLD) -V 2>&1 </dev/null) in
565 *Solaris*) # Solaris accept almost the same GNU options
566 echo "-Wl,-z,now" ;;
567 esac
568 ;;
569 esac
570 }
571
572
573 # Some tests for when we screw with things and want to make
574 # sure we didn't break anything
575 #TESTS() {
576 # CFLAGS="-a -b -c=1"
577 # CXXFLAGS="-x -y -z=2"
578 # LDFLAGS="-l -m -n=3"
579 #
580 # die() { exit 1; }
581 # (is-flag 1 2 3) && die
582 # (is-ldflag 1 2 3) && die
583 #
584 # is-flagq -l && die
585 # is-ldflagq -a && die
586 # is-flagq -a || die
587 # is-flagq -x || die
588 # is-ldflagq -n=* || die
589 # is-ldflagq -n && die
590 #
591 # strip-unsupported-flags
592 # [[ ${CFLAGS} == "-c=1" ]] || die
593 # [[ ${CXXFLAGS} == "-y -z=2" ]] || die
594 #
595 # echo "All tests pass"
596 #}
597 #TESTS

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