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Revision 1.96 - (show annotations) (download)
Thu Dec 8 12:16:12 2005 UTC (8 years, 7 months ago) by azarah
Branch: MAIN
Changes since 1.95: +69 -34 lines
Cleanups.

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 1.95 2005/10/13 05:33:34 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 <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 ewarn "test_flag: deprecated, please use test-flags()!" >/dev/stderr
331
332 test-flags "$@"
333 }
334
335 test_version_info() {
336 if [[ $($(tc-getCC) --version 2>&1) == *$1* ]]; then
337 return 0
338 else
339 return 1
340 fi
341 }
342
343 strip-unsupported-flags() {
344 local x NEW_CFLAGS NEW_CXXFLAGS
345
346 for x in ${CFLAGS} ; do
347 NEW_CFLAGS="${NEW_CFLAGS} $(test-flags ${x})"
348 done
349 for x in ${CXXFLAGS} ; do
350 NEW_CXXFLAGS="${NEW_CXXFLAGS} $(test-flags ${x})"
351 done
352
353 export CFLAGS=${NEW_CFLAGS}
354 export CXXFLAGS=${NEW_CXXFLAGS}
355 }
356
357 get-flag() {
358 local f findflag="$1"
359
360 # this code looks a little flaky but seems to work for
361 # everything we want ...
362 # for example, if CFLAGS="-march=i686":
363 # `get-flag -march` == "-march=i686"
364 # `get-flag march` == "i686"
365 for f in ${CFLAGS} ${CXXFLAGS} ; do
366 if [ "${f/${findflag}}" != "${f}" ] ; then
367 printf "%s\n" "${f/-${findflag}=}"
368 return 0
369 fi
370 done
371 return 1
372 }
373
374 # DEPRECATED - use gcc-specs-relro or gcc-specs-now from toolchain-funcs
375 has_hardened() {
376 ewarn "has_hardened: deprecated, please use gcc-specs-{relro,now}()!" \
377 >/dev/stderr
378
379 test_version_info Hardened && return 0
380 # The specs file wont exist unless gcc has GCC_SPECS support
381 [[ -f ${GCC_SPECS} && ${GCC_SPECS} != ${GCC_SPECS/hardened/} ]]
382 }
383
384 # DEPRECATED - use gcc-specs-pie from toolchain-funcs
385 # indicate whether PIC is set
386 has_pic() {
387 ewarn "has_pic: deprecated, please use gcc-specs-pie()!" >/dev/stderr
388
389 [[ ${CFLAGS/-fPIC} != ${CFLAGS} || \
390 ${CFLAGS/-fpic} != ${CFLAGS} || \
391 -n $(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __PIC__) ]]
392 }
393
394 # DEPRECATED - use gcc-specs-pie from toolchain-funcs
395 # indicate whether PIE is set
396 has_pie() {
397 ewarn "has_pie: deprecated, please use gcc-specs-pie()!" >/dev/stderr
398
399 [[ ${CFLAGS/-fPIE} != ${CFLAGS} || \
400 ${CFLAGS/-fpie} != ${CFLAGS} || \
401 -n $(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __PIE__) || \
402 -n $(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __PIC__) ]]
403 # test PIC while waiting for specs to be updated to generate __PIE__
404 }
405
406 # DEPRECATED - use gcc-specs-ssp from toolchain-funcs
407 # indicate whether code for SSP is being generated for all functions
408 has_ssp_all() {
409 ewarn "has_ssp_all: deprecated, please use gcc-specs-ssp()!" >/dev/stderr
410
411 # note; this matches only -fstack-protector-all
412 [[ ${CFLAGS/-fstack-protector-all} != ${CFLAGS} || \
413 -n $(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __SSP_ALL__) ]] || \
414 gcc-specs-ssp
415 }
416
417 # DEPRECATED - use gcc-specs-ssp from toolchain-funcs
418 # indicate whether code for SSP is being generated
419 has_ssp() {
420 ewarn "has_ssp: deprecated, please use gcc-specs-ssp()!" >/dev/stderr
421
422 # note; this matches both -fstack-protector and -fstack-protector-all
423 [[ ${CFLAGS/-fstack-protector} != ${CFLAGS} || \
424 -n $(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __SSP__) ]] || \
425 gcc-specs-ssp
426 }
427
428 has_m64() {
429 # this doesnt test if the flag is accepted, it tests if the flag
430 # actually -WORKS-. non-multilib gcc will take both -m32 and -m64!
431 # please dont replace this function with test_flag in some future
432 # clean-up!
433
434 local temp="$(emktemp)"
435 echo "int main() { return(0); }" > "${temp}".c
436 MY_CC=$(tc-getCC)
437 ${MY_CC/ .*/} -m64 -o "$(emktemp)" "${temp}".c > /dev/null 2>&1
438 local ret=$?
439 rm -f "${temp}".c
440 [[ ${ret} != 1 ]] && return 0
441 return 1
442 }
443
444 has_m32() {
445 # this doesnt test if the flag is accepted, it tests if the flag
446 # actually -WORKS-. non-multilib gcc will take both -m32 and -m64!
447 # please dont replace this function with test_flag in some future
448 # clean-up!
449
450 [ "$(tc-arch)" = "amd64" ] && has_multilib_profile && return 0
451
452 local temp=$(emktemp)
453 echo "int main() { return(0); }" > "${temp}".c
454 MY_CC=$(tc-getCC)
455 ${MY_CC/ .*/} -m32 -o "$(emktemp)" "${temp}".c > /dev/null 2>&1
456 local ret=$?
457 rm -f "${temp}".c
458 [[ ${ret} != 1 ]] && return 0
459 return 1
460 }
461
462 replace-sparc64-flags() {
463 local SPARC64_CPUS="ultrasparc v9"
464
465 if [ "${CFLAGS/mtune}" != "${CFLAGS}" ]; then
466 for x in ${SPARC64_CPUS}; do
467 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8}"
468 done
469 else
470 for x in ${SPARC64_CPUS}; do
471 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
472 done
473 fi
474
475 if [ "${CXXFLAGS/mtune}" != "${CXXFLAGS}" ]; then
476 for x in ${SPARC64_CPUS}; do
477 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8}"
478 done
479 else
480 for x in ${SPARC64_CPUS}; do
481 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
482 done
483 fi
484
485 export CFLAGS CXXFLAGS
486 }
487
488 append-ldflags() {
489 export LDFLAGS="${LDFLAGS} $*"
490 return 0
491 }
492
493 filter-ldflags() {
494 local x
495
496 # we do this fancy spacing stuff so as to not filter
497 # out part of a flag ... we want flag atoms ! :D
498 LDFLAGS=" ${LDFLAGS} "
499 for x in "$@" ; do
500 LDFLAGS=${LDFLAGS// ${x} / }
501 done
502 [[ -z ${LDFLAGS// } ]] \
503 && LDFLAGS="" \
504 || LDFLAGS=${LDFLAGS:1:${#LDFLAGS}-2}
505 export LDFLAGS
506 return 0
507 }
508
509 fstack-flags() {
510 if gcc-specs-ssp; then
511 [ -z "`is-flag -fno-stack-protector`" ] &&
512 export CFLAGS="${CFLAGS} `test_flag -fno-stack-protector`"
513 fi
514 return 0
515 }
516
517 # This is thanks to great work from Paul de Vrieze <gentoo-user@devrieze.net>,
518 # bug #9016. Also thanks to Jukka Salmi <salmi@gmx.net> (bug #13907) for more
519 # fixes.
520 #
521 # Export CFLAGS and CXXFLAGS that are compadible with gcc-2.95.3
522 gcc2-flags() {
523 if [[ $(tc-arch) == "x86" || $(tc-arch) == "amd64" ]] ; then
524 CFLAGS=${CFLAGS//-mtune=/-mcpu=}
525 CXXFLAGS=${CXXFLAGS//-mtune=/-mcpu=}
526 fi
527
528 replace-cpu-flags k6-{2,3} k6
529 replace-cpu-flags athlon{,-{tbird,4,xp,mp}} i686
530
531 replace-cpu-flags pentium-mmx i586
532 replace-cpu-flags pentium{2,3,4} i686
533
534 replace-cpu-flags ev6{7,8} ev6
535
536 export CFLAGS CXXFLAGS
537 }
538
539 # Gets the flags needed for "NOW" binding
540 bindnow-flags() {
541 case $($(tc-getLD) -v 2>&1 </dev/null) in
542 *GNU* | *'with BFD'*) # GNU ld
543 echo "-Wl,-z,now" ;;
544 *Apple*) # Darwin ld
545 echo "-bind_at_load" ;;
546 *)
547 # Some linkers just recognize -V instead of -v
548 case $($(tc-getLD) -V 2>&1 </dev/null) in
549 *Solaris*) # Solaris accept almost the same GNU options
550 echo "-Wl,-z,now" ;;
551 esac
552 ;;
553 esac
554 }

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