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Revision 1.107 - (show annotations) (download)
Sat Apr 15 00:44:16 2006 UTC (8 years, 4 months ago) by vapier
Branch: MAIN
Changes since 1.106: +2 -1 lines
allow -fno-ident #129763 by Nicholas Doyle

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 1.106 2006/02/19 23:18:30 vapier 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[q] <flag> ####
25 # Returns "true" if flag is set in C[XX]FLAGS
26 # Matches only complete a flag
27 # q version sets return code but doesn't echo
28 #
29 #### is-ldflag[q] <flag> ####
30 # Returns "true" if flag is set in LDFLAGS
31 # Matches only complete a flag
32 # q version sets return code but doesn't echo
33 #
34 #### strip-flags ####
35 # Strip C[XX]FLAGS of everything except known
36 # good options.
37 #
38 #### strip-unsupported-flags ####
39 # Strip C[XX]FLAGS of any flags not supported by
40 # installed version of gcc
41 #
42 #### get-flag <flag> ####
43 # Find and echo the value for a particular flag
44 #
45 #### replace-sparc64-flags ####
46 # Sets mcpu to v8 and uses the original value
47 # as mtune if none specified.
48 #
49 #### filter-mfpmath <math types> ####
50 # Remove specified math types from the fpmath specification
51 # If the user has -mfpmath=sse,386, running `filter-mfpmath sse`
52 # will leave the user with -mfpmath=386
53 #
54 #### append-ldflags ####
55 # Add extra flags to your current LDFLAGS
56 #
57 #### filter-ldflags <flags> ####
58 # Remove particular flags from LDFLAGS
59 # Matches only complete flags
60 #
61 #### bindnow-flags ####
62 # Returns the flags to enable "now" binding in the current selected linker.
63 #
64 ################ DEPRECATED functions ################
65 # The following are still present to avoid breaking existing
66 # code more than necessary; however they are deprecated. Please
67 # use gcc-specs-* from toolchain-funcs.eclass instead, if you
68 # need to know which hardened techs are active in the compiler.
69 # See bug #100974
70 #
71 #### has_hardened ####
72 # Returns true if the compiler has 'Hardened' in its version string,
73 # (note; switched-spec vanilla compilers satisfy this condition) or
74 # the specs file name contains 'hardened'.
75 #
76 #### has_pie ####
77 # Returns true if the compiler by default or with current CFLAGS
78 # builds position-independent code.
79 #
80 #### has_pic ####
81 # Returns true if the compiler by default or with current CFLAGS
82 # builds position-independent code.
83 #
84 #### has_ssp_all ####
85 # Returns true if the compiler by default or with current CFLAGS
86 # generates stack smash protections for all functions
87 #
88 #### has_ssp ####
89 # Returns true if the compiler by default or with current CFLAGS
90 # generates stack smash protections for most vulnerable functions
91 #
92
93 # C[XX]FLAGS that we allow in strip-flags
94 setup-allowed-flags() {
95 if [[ -z ${ALLOWED_FLAGS} ]] ; then
96 export ALLOWED_FLAGS="-pipe"
97 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -O -O0 -O1 -O2 -mcpu -march -mtune"
98 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -fstack-protector -fstack-protector-all"
99 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -fbounds-checking -fno-bounds-checking"
100 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -fno-PIE -fno-pie -fno-unit-at-a-time"
101 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -g -g0 -g1 -g2 -g3 -ggdb -ggdb0 -ggdb1 -ggdb2 -ggdb3"
102 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -fno-ident"
103 fi
104 # allow a bunch of flags that negate features / control ABI
105 ALLOWED_FLAGS="${ALLOWED_FLAGS} -fno-stack-protector -fno-stack-protector-all"
106 ALLOWED_FLAGS="${ALLOWED_FLAGS} -mregparm -mno-app-regs -mapp-regs \
107 -mno-mmx -mno-sse -mno-sse2 -mno-sse3 -mno-3dnow \
108 -mips1 -mips2 -mips3 -mips4 -mips32 -mips64 -mips16 \
109 -msoft-float -mno-soft-float -mhard-float -mno-hard-float -mfpu \
110 -mieee -mieee-with-inexact \
111 -mtls-direct-seg-refs -mno-tls-direct-seg-refs \
112 -mflat -mno-flat -mno-faster-structs -mfaster-structs \
113 -m32 -m64 -mabi -mlittle-endian -mbig-endian -EL -EB -fPIC \
114 -mlive-g0 -mcmodel -mstack-bias -mno-stack-bias"
115
116 # C[XX]FLAGS that we are think is ok, but needs testing
117 # NOTE: currently -Os have issues with gcc3 and K6* arch's
118 export UNSTABLE_FLAGS="-Os -O3 -freorder-blocks"
119 return 0
120 }
121
122 # inverted filters for hardened compiler. This is trying to unpick
123 # the hardened compiler defaults.
124 _filter-hardened() {
125 local f
126 for f in "$@" ; do
127 case "${f}" in
128 # Ideally we should only concern ourselves with PIE flags,
129 # not -fPIC or -fpic, but too many places filter -fPIC without
130 # thinking about -fPIE.
131 -fPIC|-fpic|-fPIE|-fpie|-Wl,pie|-pie)
132 gcc-specs-pie || continue
133 is-flagq -nopie || append-flags -nopie;;
134 -fstack-protector)
135 gcc-specs-ssp || continue
136 is-flagq -fno-stack-protector || append-flags -fno-stack-protector;;
137 -fstack-protector-all)
138 gcc-specs-ssp-to-all || continue
139 is-flagq -fno-stack-protector-all || append-flags -fno-stack-protector-all;;
140 esac
141 done
142 }
143
144 # Remove occurrences of strings from variable given in $1
145 # Strings removed are matched as globs, so for example
146 # '-O*' would remove -O1, -O2 etc.
147 _filter-var() {
148 local f x VAR VAL
149 declare -a new
150
151 VAR=$1
152 shift
153 eval VAL=\${${VAR}}
154 for f in ${VAL}; do
155 for x in "$@"; do
156 # Note this should work with globs like -O*
157 [[ ${f} == ${x} ]] && continue 2
158 done
159 eval new\[\${\#new\[@]}]=\${f}
160 done
161 eval export ${VAR}=\${new\[*]}
162 }
163
164 filter-flags() {
165 _filter-hardened "$@"
166 _filter-var CFLAGS "$@"
167 _filter-var CXXFLAGS "$@"
168 return 0
169 }
170
171 filter-lfs-flags() {
172 [[ -n $@ ]] && die "filter-lfs-flags takes no arguments"
173 filter-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
174 }
175
176 append-lfs-flags() {
177 [[ -n $@ ]] && die "append-lfs-flags takes no arguments"
178 append-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
179 }
180
181 append-flags() {
182 [[ -z $* ]] && return 0
183 export CFLAGS="${CFLAGS} $*"
184 export CXXFLAGS="${CXXFLAGS} $*"
185 return 0
186 }
187
188 replace-flags() {
189 [[ $# != 2 ]] \
190 && echo && eerror "Usage: replace-flags <old flag> <new flag>" \
191 && die "replace-flags takes 2 arguments, not $#"
192
193 local f fset
194 declare -a new_CFLAGS new_CXXFLAGS
195
196 for fset in CFLAGS CXXFLAGS; do
197 # Looping over the flags instead of using a global
198 # substitution ensures that we're working with flag atoms.
199 # Otherwise globs like -O* have the potential to wipe out the
200 # list of flags.
201 for f in ${!fset}; do
202 # Note this should work with globs like -O*
203 [[ ${f} == ${1} ]] && f=${2}
204 eval new_${fset}\[\${\#new_${fset}\[@]}]=\${f}
205 done
206 eval export ${fset}=\${new_${fset}\[*]}
207 done
208
209 return 0
210 }
211
212 replace-cpu-flags() {
213 local newcpu="$#" ; newcpu="${!newcpu}"
214 while [ $# -gt 1 ] ; do
215 # quote to make sure that no globbing is done (particularly on
216 # ${oldcpu} prior to calling replace-flags
217 replace-flags "-march=${1}" "-march=${newcpu}"
218 replace-flags "-mcpu=${1}" "-mcpu=${newcpu}"
219 replace-flags "-mtune=${1}" "-mtune=${newcpu}"
220 shift
221 done
222 return 0
223 }
224
225 is-flagq() {
226 local x
227
228 for x in ${CFLAGS} ${CXXFLAGS} ; do
229 # Note this should work with globs like -mcpu=ultrasparc*
230 if [[ ${x} == ${1} ]]; then
231 return 0
232 fi
233 done
234 return 1
235 }
236
237 is-flag() {
238 if is-flagq ${1}; then
239 echo true
240 return 0
241 fi
242 return 1
243 }
244
245 is-ldflagq() {
246 local x
247
248 for x in ${LDFLAGS} ; do
249 # Note this should work with globs like -mcpu=ultrasparc*
250 if [[ ${x} == ${1} ]]; then
251 return 0
252 fi
253 done
254 return 1
255 }
256
257 is-ldflag() {
258 if is-ldflagq ${1}; then
259 echo true
260 return 0
261 fi
262 return 1
263 }
264
265 filter-mfpmath() {
266 local orig_mfpmath new_math prune_math
267
268 # save the original -mfpmath flag
269 orig_mfpmath="`get-flag -mfpmath`"
270 # get the value of the current -mfpmath flag
271 new_math=" `get-flag mfpmath | tr , ' '` "
272 # figure out which math values are to be removed
273 prune_math=""
274 for prune_math in "$@" ; do
275 new_math="${new_math/ ${prune_math} / }"
276 done
277 new_math="`echo ${new_math:1:${#new_math}-2} | tr ' ' ,`"
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 ${comp} ]] && \
367 return 1
368
369 for x in "$@" ; do
370 test-flag-${comp} "${x}" && 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 local x NEW_CFLAGS NEW_CXXFLAGS
406
407 for x in ${CFLAGS} ; do
408 NEW_CFLAGS="${NEW_CFLAGS} $(test-flags ${x})"
409 done
410 for x in ${CXXFLAGS} ; do
411 NEW_CXXFLAGS="${NEW_CXXFLAGS} $(test-flags ${x})"
412 done
413
414 export CFLAGS=${NEW_CFLAGS}
415 export CXXFLAGS=${NEW_CXXFLAGS}
416 }
417
418 get-flag() {
419 local f findflag="$1"
420
421 # this code looks a little flaky but seems to work for
422 # everything we want ...
423 # for example, if CFLAGS="-march=i686":
424 # `get-flag -march` == "-march=i686"
425 # `get-flag march` == "i686"
426 for f in ${CFLAGS} ${CXXFLAGS} ; do
427 if [ "${f/${findflag}}" != "${f}" ] ; then
428 printf "%s\n" "${f/-${findflag}=}"
429 return 0
430 fi
431 done
432 return 1
433 }
434
435 # DEPRECATED - use gcc-specs-relro or gcc-specs-now from toolchain-funcs
436 has_hardened() {
437 ewarn "has_hardened: deprecated, please use gcc-specs-{relro,now}()!" >&2
438
439 test_version_info Hardened && return 0
440 # The specs file wont exist unless gcc has GCC_SPECS support
441 [[ -f ${GCC_SPECS} && ${GCC_SPECS} != ${GCC_SPECS/hardened/} ]]
442 }
443
444 # DEPRECATED - use gcc-specs-pie from toolchain-funcs
445 # indicate whether PIC is set
446 has_pic() {
447 ewarn "has_pic: deprecated, please use gcc-specs-pie()!" >&2
448
449 [[ ${CFLAGS/-fPIC} != ${CFLAGS} || \
450 ${CFLAGS/-fpic} != ${CFLAGS} ]] || \
451 gcc-specs-pie
452 }
453
454 # DEPRECATED - use gcc-specs-pie from toolchain-funcs
455 # indicate whether PIE is set
456 has_pie() {
457 ewarn "has_pie: deprecated, please use gcc-specs-pie()!" >&2
458
459 [[ ${CFLAGS/-fPIE} != ${CFLAGS} || \
460 ${CFLAGS/-fpie} != ${CFLAGS} ]] || \
461 gcc-specs-pie
462 }
463
464 # DEPRECATED - use gcc-specs-ssp from toolchain-funcs
465 # indicate whether code for SSP is being generated for all functions
466 has_ssp_all() {
467 ewarn "has_ssp_all: deprecated, please use gcc-specs-ssp()!" >&2
468
469 # note; this matches only -fstack-protector-all
470 [[ ${CFLAGS/-fstack-protector-all} != ${CFLAGS} || \
471 -n $(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __SSP_ALL__) ]] || \
472 gcc-specs-ssp-all
473 }
474
475 # DEPRECATED - use gcc-specs-ssp from toolchain-funcs
476 # indicate whether code for SSP is being generated
477 has_ssp() {
478 ewarn "has_ssp: deprecated, please use gcc-specs-ssp()!" >&2
479
480 # note; this matches both -fstack-protector and -fstack-protector-all
481 [[ ${CFLAGS/-fstack-protector} != ${CFLAGS} || \
482 -n $(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __SSP__) ]] || \
483 gcc-specs-ssp
484 }
485
486 has_m64() {
487 # this doesnt test if the flag is accepted, it tests if the flag
488 # actually -WORKS-. non-multilib gcc will take both -m32 and -m64!
489 # please dont replace this function with test_flag in some future
490 # clean-up!
491
492 local temp="$(emktemp)"
493 echo "int main() { return(0); }" > "${temp}".c
494 MY_CC=$(tc-getCC)
495 ${MY_CC/ .*/} -m64 -o "$(emktemp)" "${temp}".c > /dev/null 2>&1
496 local ret=$?
497 rm -f "${temp}".c
498 [[ ${ret} != 1 ]] && return 0
499 return 1
500 }
501
502 has_m32() {
503 # this doesnt test if the flag is accepted, it tests if the flag
504 # actually -WORKS-. non-multilib gcc will take both -m32 and -m64!
505 # please dont replace this function with test_flag in some future
506 # clean-up!
507
508 [ "$(tc-arch)" = "amd64" ] && has_multilib_profile && return 0
509
510 local temp=$(emktemp)
511 echo "int main() { return(0); }" > "${temp}".c
512 MY_CC=$(tc-getCC)
513 ${MY_CC/ .*/} -m32 -o "$(emktemp)" "${temp}".c > /dev/null 2>&1
514 local ret=$?
515 rm -f "${temp}".c
516 [[ ${ret} != 1 ]] && return 0
517 return 1
518 }
519
520 replace-sparc64-flags() {
521 local SPARC64_CPUS="ultrasparc3 ultrasparc v9"
522
523 if [ "${CFLAGS/mtune}" != "${CFLAGS}" ]; then
524 for x in ${SPARC64_CPUS}; do
525 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8}"
526 done
527 else
528 for x in ${SPARC64_CPUS}; do
529 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
530 done
531 fi
532
533 if [ "${CXXFLAGS/mtune}" != "${CXXFLAGS}" ]; then
534 for x in ${SPARC64_CPUS}; do
535 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8}"
536 done
537 else
538 for x in ${SPARC64_CPUS}; do
539 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
540 done
541 fi
542
543 export CFLAGS CXXFLAGS
544 }
545
546 append-ldflags() {
547 [[ -z $* ]] && return 0
548 export LDFLAGS="${LDFLAGS} $*"
549 return 0
550 }
551
552 # Remove flags from LDFLAGS - it's up to the ebuild to filter
553 # CFLAGS and CXXFLAGS via filter-flags if they need to.
554 filter-ldflags() {
555 _filter-var LDFLAGS "$@"
556 return 0
557 }
558
559 # Turn C style ldflags (-Wl,-foo) into straight ldflags - the results
560 # are suitable for passing directly to 'ld'; note LDFLAGS is usually passed
561 # to gcc where it needs the '-Wl,'.
562 raw-ldflags() {
563 local x input="$@"
564 [[ -z ${input} ]] && input=${LDFLAGS}
565 set --
566 for x in ${input} ; do
567 x=${x#-Wl,}
568 set -- "$@" ${x//,/ }
569 done
570 echo "$@"
571 }
572
573 # This is thanks to great work from Paul de Vrieze <gentoo-user@devrieze.net>,
574 # bug #9016. Also thanks to Jukka Salmi <salmi@gmx.net> (bug #13907) for more
575 # fixes.
576 #
577 # Export CFLAGS and CXXFLAGS that are compadible with gcc-2.95.3
578 gcc2-flags() {
579 if [[ $(tc-arch) == "x86" || $(tc-arch) == "amd64" ]] ; then
580 CFLAGS=${CFLAGS//-mtune=/-mcpu=}
581 CXXFLAGS=${CXXFLAGS//-mtune=/-mcpu=}
582 fi
583
584 replace-cpu-flags k6-{2,3} k6
585 replace-cpu-flags athlon{,-{tbird,4,xp,mp}} i686
586
587 replace-cpu-flags pentium-mmx i586
588 replace-cpu-flags pentium{2,3,4} i686
589
590 replace-cpu-flags ev6{7,8} ev6
591
592 export CFLAGS CXXFLAGS
593 }
594
595 # Gets the flags needed for "NOW" binding
596 bindnow-flags() {
597 case $($(tc-getLD) -v 2>&1 </dev/null) in
598 *GNU* | *'with BFD'*) # GNU ld
599 echo "-Wl,-z,now" ;;
600 *Apple*) # Darwin ld
601 echo "-bind_at_load" ;;
602 *)
603 # Some linkers just recognize -V instead of -v
604 case $($(tc-getLD) -V 2>&1 </dev/null) in
605 *Solaris*) # Solaris accept almost the same GNU options
606 echo "-Wl,-z,now" ;;
607 esac
608 ;;
609 esac
610 }

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