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Revision 1.98 - (show annotations) (download)
Fri Dec 9 18:40:11 2005 UTC (8 years, 9 months ago) by fmccor
Branch: MAIN
Changes since 1.97: +2 -2 lines
In replace-sparc64-cflags, we need local 'SPARC64_CPUS="ultrasparc3 ultrasparc v9"'.
Without the ultrasparc3 at the beginning of the list, in some cases, we can end up
with '-mcpu=ultrasparc3' ==> '-mcpu=v83', and subsequently, package configure can
fail.  Problem arose from mozilla and a particular set lf CFLAGS.

1 # Copyright 1999-2005 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 1.97 2005/12/08 21:08:48 azarah Exp $
4
5
6 # need access to emktemp()
7 inherit eutils toolchain-funcs multilib
8
9 #
10 #### filter-flags <flags> ####
11 # Remove particular flags from C[XX]FLAGS
12 # Matches only complete flags
13 #
14 #### append-flags <flags> ####
15 # Add extra flags to your current C[XX]FLAGS
16 #
17 #### replace-flags <orig.flag> <new.flag> ###
18 # Replace a flag by another one
19 #
20 #### replace-cpu-flags <old.cpus> <new.cpu> ###
21 # Replace march/mcpu flags that specify <old.cpus>
22 # with flags that specify <new.cpu>
23 #
24 #### is-flag <flag> ####
25 # Returns "true" if flag is set in C[XX]FLAGS
26 # Matches only complete a flag
27 #
28 #### strip-flags ####
29 # Strip C[XX]FLAGS of everything except known
30 # good options.
31 #
32 #### strip-unsupported-flags ####
33 # Strip C[XX]FLAGS of any flags not supported by
34 # installed version of gcc
35 #
36 #### get-flag <flag> ####
37 # Find and echo the value for a particular flag
38 #
39 #### replace-sparc64-flags ####
40 # Sets mcpu to v8 and uses the original value
41 # as mtune if none specified.
42 #
43 #### filter-mfpmath <math types> ####
44 # Remove specified math types from the fpmath specification
45 # If the user has -mfpmath=sse,386, running `filter-mfpmath sse`
46 # will leave the user with -mfpmath=386
47 #
48 #### append-ldflags ####
49 # Add extra flags to your current LDFLAGS
50 #
51 #### filter-ldflags <flags> ####
52 # Remove particular flags from LDFLAGS
53 # Matches only complete flags
54 #
55 #### fstack-flags ####
56 # hooked function for hardened gcc that appends
57 # -fno-stack-protector to {C,CXX,LD}FLAGS
58 # when a package is filtering -fstack-protector, -fstack-protector-all
59 # notice: modern automatic specs files will also suppress -fstack-protector-all
60 # when only -fno-stack-protector is given
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="${ALLOWED_FLAGS} -fno-pie -fno-unit-at-a-time"
102 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -g -g0 -g1 -g2 -g3 -ggdb -ggdb0 -ggdb1 -ggdb2 -ggdb3"
103 fi
104 # allow a bunch of flags that negate features / control ABI
105 ALLOWED_FLAGS="${ALLOWED_FLAGS} -fno-stack-protector -fno-stack-protector-all"
106 ALLOWED_FLAGS="${ALLOWED_FLAGS} -mregparm -mno-app-regs -mapp-regs \
107 -mno-mmx -mno-sse -mno-sse2 -mno-sse3 -mno-3dnow \
108 -mips1 -mips2 -mips3 -mips4 -mips32 -mips64 -mips16 \
109 -msoft-float -mno-soft-float -mhard-float -mno-hard-float -mfpu \
110 -mieee -mieee-with-inexact \
111 -mtls-direct-seg-refs -mno-tls-direct-seg-refs \
112 -mflat -mno-flat -mno-faster-structs -mfaster-structs \
113 -m32 -m64 -mabi -mlittle-endian -mbig-endian -EL -EB -fPIC \
114 -mlive-g0 -mcmodel -mstack-bias -mno-stack-bias"
115
116 # C[XX]FLAGS that we are think is ok, but needs testing
117 # NOTE: currently -Os have issues with gcc3 and K6* arch's
118 export UNSTABLE_FLAGS="-Os -O3 -freorder-blocks -fprefetch-loop-arrays"
119 return 0
120 }
121
122 filter-flags() {
123 local x f fset
124 declare -a new_CFLAGS new_CXXFLAGS
125
126 for x in "$@" ; do
127 case "${x}" in
128 -fPIC|-fpic|-fPIE|-fpie|-pie)
129 append-flags `test_flag -fno-pie`;;
130 -fstack-protector|-fstack-protector-all)
131 fstack-flags;;
132 esac
133 done
134
135 for fset in CFLAGS CXXFLAGS; do
136 # Looping over the flags instead of using a global
137 # substitution ensures that we're working with flag atoms.
138 # Otherwise globs like -O* have the potential to wipe out the
139 # list of flags.
140 for f in ${!fset}; do
141 for x in "$@"; do
142 # Note this should work with globs like -O*
143 [[ ${f} == ${x} ]] && continue 2
144 done
145 eval new_${fset}\[\${\#new_${fset}\[@]}]=\${f}
146 done
147 eval export ${fset}=\${new_${fset}\[*]}
148 done
149
150 return 0
151 }
152
153 filter-lfs-flags() {
154 [[ -n $@ ]] && die "filter-lfs-flags takes no arguments"
155 filter-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
156 }
157
158 append-lfs-flags() {
159 [[ -n $@ ]] && die "append-lfs-flags takes no arguments"
160 append-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
161 }
162
163 append-flags() {
164 [[ -z $* ]] && return 0
165 export CFLAGS="${CFLAGS} $*"
166 export CXXFLAGS="${CXXFLAGS} $*"
167 [ -n "`is-flag -fno-stack-protector`" -o \
168 -n "`is-flag -fno-stack-protector-all`" ] && fstack-flags
169 return 0
170 }
171
172 replace-flags() {
173 [[ $# != 2 ]] \
174 && echo && eerror "Usage: replace-flags <old flag> <new flag>" \
175 && die "replace-flags takes 2 arguments, not $#"
176
177 local f fset
178 declare -a new_CFLAGS new_CXXFLAGS
179
180 for fset in CFLAGS CXXFLAGS; do
181 # Looping over the flags instead of using a global
182 # substitution ensures that we're working with flag atoms.
183 # Otherwise globs like -O* have the potential to wipe out the
184 # list of flags.
185 for f in ${!fset}; do
186 # Note this should work with globs like -O*
187 [[ ${f} == ${1} ]] && f=${2}
188 eval new_${fset}\[\${\#new_${fset}\[@]}]=\${f}
189 done
190 eval export ${fset}=\${new_${fset}\[*]}
191 done
192
193 return 0
194 }
195
196 replace-cpu-flags() {
197 local newcpu="$#" ; newcpu="${!newcpu}"
198 while [ $# -gt 1 ] ; do
199 # quote to make sure that no globbing is done (particularly on
200 # ${oldcpu} prior to calling replace-flags
201 replace-flags "-march=${1}" "-march=${newcpu}"
202 replace-flags "-mcpu=${1}" "-mcpu=${newcpu}"
203 replace-flags "-mtune=${1}" "-mtune=${newcpu}"
204 shift
205 done
206 return 0
207 }
208
209 is-flag() {
210 local x
211
212 for x in ${CFLAGS} ${CXXFLAGS} ; do
213 # Note this should work with globs like -mcpu=ultrasparc*
214 if [[ ${x} == ${1} ]]; then
215 echo true
216 return 0
217 fi
218 done
219 return 1
220 }
221
222 filter-mfpmath() {
223 local orig_mfpmath new_math prune_math
224
225 # save the original -mfpmath flag
226 orig_mfpmath="`get-flag -mfpmath`"
227 # get the value of the current -mfpmath flag
228 new_math=" `get-flag mfpmath | tr , ' '` "
229 # figure out which math values are to be removed
230 prune_math=""
231 for prune_math in "$@" ; do
232 new_math="${new_math/ ${prune_math} / }"
233 done
234 new_math="`echo ${new_math:1:${#new_math}-2} | tr ' ' ,`"
235
236 if [ -z "${new_math}" ] ; then
237 # if we're removing all user specified math values are
238 # slated for removal, then we just filter the flag
239 filter-flags ${orig_mfpmath}
240 else
241 # if we only want to filter some of the user specified
242 # math values, then we replace the current flag
243 replace-flags ${orig_mfpmath} -mfpmath=${new_math}
244 fi
245 return 0
246 }
247
248 strip-flags() {
249 local x y flag NEW_CFLAGS NEW_CXXFLAGS
250
251 setup-allowed-flags
252
253 local NEW_CFLAGS=""
254 local NEW_CXXFLAGS=""
255
256 # Allow unstable C[XX]FLAGS if we are using unstable profile ...
257 if has ~$(tc-arch) ${ACCEPT_KEYWORDS} ; then
258 ALLOWED_FLAGS="${ALLOWED_FLAGS} ${UNSTABLE_FLAGS}"
259 fi
260
261 set -f # disable pathname expansion
262
263 for x in ${CFLAGS}; do
264 for y in ${ALLOWED_FLAGS}; do
265 flag=${x%%=*}
266 if [ "${flag%%${y}}" = "" ] ; then
267 NEW_CFLAGS="${NEW_CFLAGS} ${x}"
268 break
269 fi
270 done
271 done
272
273 for x in ${CXXFLAGS}; do
274 for y in ${ALLOWED_FLAGS}; do
275 flag=${x%%=*}
276 if [ "${flag%%${y}}" = "" ] ; then
277 NEW_CXXFLAGS="${NEW_CXXFLAGS} ${x}"
278 break
279 fi
280 done
281 done
282
283 # In case we filtered out all optimization flags fallback to -O2
284 if [ "${CFLAGS/-O}" != "${CFLAGS}" -a "${NEW_CFLAGS/-O}" = "${NEW_CFLAGS}" ]; then
285 NEW_CFLAGS="${NEW_CFLAGS} -O2"
286 fi
287 if [ "${CXXFLAGS/-O}" != "${CXXFLAGS}" -a "${NEW_CXXFLAGS/-O}" = "${NEW_CXXFLAGS}" ]; then
288 NEW_CXXFLAGS="${NEW_CXXFLAGS} -O2"
289 fi
290
291 set +f # re-enable pathname expansion
292
293 export CFLAGS="${NEW_CFLAGS}"
294 export CXXFLAGS="${NEW_CXXFLAGS}"
295 return 0
296 }
297
298 test-flag-PROG() {
299 local comp=$1
300 local flags="$2"
301
302 [[ -z ${comp} || -z ${flags} ]] && \
303 return 1
304
305 local PROG=$(tc-get${comp})
306 ${PROG} ${flags} -S -o /dev/null -xc /dev/null \
307 > /dev/null 2>&1
308 }
309
310 # Returns true if C compiler support given flag
311 test-flag-CC() { test-flag-PROG "CC" "$1"; }
312
313 # Returns true if C++ compiler support given flag
314 test-flag-CXX() { test-flag-PROG "CXX" "$1"; }
315
316 test-flags() {
317 local x
318
319 for x in "$@" ; do
320 test-flag-CC "${x}" || return 1
321 done
322
323 echo "$@"
324
325 return 0
326 }
327
328 # Depriciated, use test-flags()
329 test_flag() {
330 addwrite "/dev/stderr"
331 ewarn "test_flag: deprecated, please use test-flags()!" >/dev/stderr
332
333 test-flags "$@"
334 }
335
336 test_version_info() {
337 if [[ $($(tc-getCC) --version 2>&1) == *$1* ]]; then
338 return 0
339 else
340 return 1
341 fi
342 }
343
344 strip-unsupported-flags() {
345 local x NEW_CFLAGS NEW_CXXFLAGS
346
347 for x in ${CFLAGS} ; do
348 NEW_CFLAGS="${NEW_CFLAGS} $(test-flags ${x})"
349 done
350 for x in ${CXXFLAGS} ; do
351 NEW_CXXFLAGS="${NEW_CXXFLAGS} $(test-flags ${x})"
352 done
353
354 export CFLAGS=${NEW_CFLAGS}
355 export CXXFLAGS=${NEW_CXXFLAGS}
356 }
357
358 get-flag() {
359 local f findflag="$1"
360
361 # this code looks a little flaky but seems to work for
362 # everything we want ...
363 # for example, if CFLAGS="-march=i686":
364 # `get-flag -march` == "-march=i686"
365 # `get-flag march` == "i686"
366 for f in ${CFLAGS} ${CXXFLAGS} ; do
367 if [ "${f/${findflag}}" != "${f}" ] ; then
368 printf "%s\n" "${f/-${findflag}=}"
369 return 0
370 fi
371 done
372 return 1
373 }
374
375 # DEPRECATED - use gcc-specs-relro or gcc-specs-now from toolchain-funcs
376 has_hardened() {
377 addwrite "/dev/stderr"
378 ewarn "has_hardened: deprecated, please use gcc-specs-{relro,now}()!" \
379 >/dev/stderr
380
381 test_version_info Hardened && return 0
382 # The specs file wont exist unless gcc has GCC_SPECS support
383 [[ -f ${GCC_SPECS} && ${GCC_SPECS} != ${GCC_SPECS/hardened/} ]]
384 }
385
386 # DEPRECATED - use gcc-specs-pie from toolchain-funcs
387 # indicate whether PIC is set
388 has_pic() {
389 addwrite "/dev/stderr"
390 ewarn "has_pic: deprecated, please use gcc-specs-pie()!" >/dev/stderr
391
392 [[ ${CFLAGS/-fPIC} != ${CFLAGS} || \
393 ${CFLAGS/-fpic} != ${CFLAGS} || \
394 -n $(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __PIC__) ]]
395 }
396
397 # DEPRECATED - use gcc-specs-pie from toolchain-funcs
398 # indicate whether PIE is set
399 has_pie() {
400 addwrite "/dev/stderr"
401 ewarn "has_pie: deprecated, please use gcc-specs-pie()!" >/dev/stderr
402
403 [[ ${CFLAGS/-fPIE} != ${CFLAGS} || \
404 ${CFLAGS/-fpie} != ${CFLAGS} || \
405 -n $(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __PIE__) || \
406 -n $(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __PIC__) ]]
407 # test PIC while waiting for specs to be updated to generate __PIE__
408 }
409
410 # DEPRECATED - use gcc-specs-ssp from toolchain-funcs
411 # indicate whether code for SSP is being generated for all functions
412 has_ssp_all() {
413 addwrite "/dev/stderr"
414 ewarn "has_ssp_all: deprecated, please use gcc-specs-ssp()!" >/dev/stderr
415
416 # note; this matches only -fstack-protector-all
417 [[ ${CFLAGS/-fstack-protector-all} != ${CFLAGS} || \
418 -n $(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __SSP_ALL__) ]] || \
419 gcc-specs-ssp
420 }
421
422 # DEPRECATED - use gcc-specs-ssp from toolchain-funcs
423 # indicate whether code for SSP is being generated
424 has_ssp() {
425 addwrite "/dev/stderr"
426 ewarn "has_ssp: deprecated, please use gcc-specs-ssp()!" >/dev/stderr
427
428 # note; this matches both -fstack-protector and -fstack-protector-all
429 [[ ${CFLAGS/-fstack-protector} != ${CFLAGS} || \
430 -n $(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __SSP__) ]] || \
431 gcc-specs-ssp
432 }
433
434 has_m64() {
435 # this doesnt test if the flag is accepted, it tests if the flag
436 # actually -WORKS-. non-multilib gcc will take both -m32 and -m64!
437 # please dont replace this function with test_flag in some future
438 # clean-up!
439
440 local temp="$(emktemp)"
441 echo "int main() { return(0); }" > "${temp}".c
442 MY_CC=$(tc-getCC)
443 ${MY_CC/ .*/} -m64 -o "$(emktemp)" "${temp}".c > /dev/null 2>&1
444 local ret=$?
445 rm -f "${temp}".c
446 [[ ${ret} != 1 ]] && return 0
447 return 1
448 }
449
450 has_m32() {
451 # this doesnt test if the flag is accepted, it tests if the flag
452 # actually -WORKS-. non-multilib gcc will take both -m32 and -m64!
453 # please dont replace this function with test_flag in some future
454 # clean-up!
455
456 [ "$(tc-arch)" = "amd64" ] && has_multilib_profile && return 0
457
458 local temp=$(emktemp)
459 echo "int main() { return(0); }" > "${temp}".c
460 MY_CC=$(tc-getCC)
461 ${MY_CC/ .*/} -m32 -o "$(emktemp)" "${temp}".c > /dev/null 2>&1
462 local ret=$?
463 rm -f "${temp}".c
464 [[ ${ret} != 1 ]] && return 0
465 return 1
466 }
467
468 replace-sparc64-flags() {
469 local SPARC64_CPUS="ultrasparc3 ultrasparc v9"
470
471 if [ "${CFLAGS/mtune}" != "${CFLAGS}" ]; then
472 for x in ${SPARC64_CPUS}; do
473 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8}"
474 done
475 else
476 for x in ${SPARC64_CPUS}; do
477 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
478 done
479 fi
480
481 if [ "${CXXFLAGS/mtune}" != "${CXXFLAGS}" ]; then
482 for x in ${SPARC64_CPUS}; do
483 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8}"
484 done
485 else
486 for x in ${SPARC64_CPUS}; do
487 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
488 done
489 fi
490
491 export CFLAGS CXXFLAGS
492 }
493
494 append-ldflags() {
495 export LDFLAGS="${LDFLAGS} $*"
496 return 0
497 }
498
499 filter-ldflags() {
500 local x
501
502 # we do this fancy spacing stuff so as to not filter
503 # out part of a flag ... we want flag atoms ! :D
504 LDFLAGS=" ${LDFLAGS} "
505 for x in "$@" ; do
506 LDFLAGS=${LDFLAGS// ${x} / }
507 done
508 [[ -z ${LDFLAGS// } ]] \
509 && LDFLAGS="" \
510 || LDFLAGS=${LDFLAGS:1:${#LDFLAGS}-2}
511 export LDFLAGS
512 return 0
513 }
514
515 fstack-flags() {
516 if gcc-specs-ssp; then
517 [ -z "`is-flag -fno-stack-protector`" ] &&
518 export CFLAGS="${CFLAGS} `test_flag -fno-stack-protector`"
519 fi
520 return 0
521 }
522
523 # This is thanks to great work from Paul de Vrieze <gentoo-user@devrieze.net>,
524 # bug #9016. Also thanks to Jukka Salmi <salmi@gmx.net> (bug #13907) for more
525 # fixes.
526 #
527 # Export CFLAGS and CXXFLAGS that are compadible with gcc-2.95.3
528 gcc2-flags() {
529 if [[ $(tc-arch) == "x86" || $(tc-arch) == "amd64" ]] ; then
530 CFLAGS=${CFLAGS//-mtune=/-mcpu=}
531 CXXFLAGS=${CXXFLAGS//-mtune=/-mcpu=}
532 fi
533
534 replace-cpu-flags k6-{2,3} k6
535 replace-cpu-flags athlon{,-{tbird,4,xp,mp}} i686
536
537 replace-cpu-flags pentium-mmx i586
538 replace-cpu-flags pentium{2,3,4} i686
539
540 replace-cpu-flags ev6{7,8} ev6
541
542 export CFLAGS CXXFLAGS
543 }
544
545 # Gets the flags needed for "NOW" binding
546 bindnow-flags() {
547 case $($(tc-getLD) -v 2>&1 </dev/null) in
548 *GNU* | *'with BFD'*) # GNU ld
549 echo "-Wl,-z,now" ;;
550 *Apple*) # Darwin ld
551 echo "-bind_at_load" ;;
552 *)
553 # Some linkers just recognize -V instead of -v
554 case $($(tc-getLD) -V 2>&1 </dev/null) in
555 *Solaris*) # Solaris accept almost the same GNU options
556 echo "-Wl,-z,now" ;;
557 esac
558 ;;
559 esac
560 }

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