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Revision 1.92 - (show annotations) (download)
Mon Aug 1 10:50:55 2005 UTC (8 years, 11 months ago) by kevquinn
Branch: MAIN
Changes since 1.91: +26 -2 lines
deprecate has_hardened/pic/pie/ssp/ssp_all in favour of gcc-specs-*
from toolchain-funcs
modify has_ssp/has_ssp_all to also try gcc-spec-ssp (for bug #90311
and bug #100902)

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 1.91 2005/07/22 21:47:51 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 #
63 ################ DEPRECATED functions ################
64 # The following are still present to avoid breaking existing
65 # code more than necessary; however they are deprecated. Please
66 # use gcc-specs-* from toolchain-funcs.eclass instead, if you
67 # need to know which hardened techs are active in the compiler.
68 # See bug #100974
69 #
70 #### has_hardened ####
71 # Returns true if the compiler has 'Hardened' in its version string,
72 # (note; switched-spec vanilla compilers satisfy this condition) or
73 # the specs file name contains 'hardened'.
74 #
75 #### has_pie ####
76 # Returns true if the compiler by default or with current CFLAGS
77 # builds position-independent code.
78 #
79 #### has_pic ####
80 # Returns true if the compiler by default or with current CFLAGS
81 # builds position-independent code.
82 #
83 #### has_ssp_all ####
84 # Returns true if the compiler by default or with current CFLAGS
85 # generates stack smash protections for all functions
86 #
87 #### has_ssp ####
88 # Returns true if the compiler by default or with current CFLAGS
89 # generates stack smash protections for most vulnerable functions
90 #
91
92 # C[XX]FLAGS that we allow in strip-flags
93 setup-allowed-flags() {
94 if [[ -z ${ALLOWED_FLAGS} ]] ; then
95 export ALLOWED_FLAGS="-pipe"
96 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -O -O0 -O1 -O2 -mcpu -march -mtune"
97 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -fstack-protector -fstack-protector-all"
98 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -fbounds-checking -fno-bounds-checking"
99 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -fno-pie -fno-unit-at-a-time"
100 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -g -g0 -g1 -g2 -g3 -ggdb -ggdb0 -ggdb1 -ggdb2 -ggdb3"
101 fi
102 # allow a bunch of flags that negate features / control ABI
103 ALLOWED_FLAGS="${ALLOWED_FLAGS} -fno-stack-protector -fno-stack-protector-all"
104 ALLOWED_FLAGS="${ALLOWED_FLAGS} -mregparm -mno-app-regs -mapp-regs \
105 -mno-mmx -mno-sse -mno-sse2 -mno-sse3 -mno-3dnow \
106 -mips1 -mips2 -mips3 -mips4 -mips32 -mips64 -mips16 \
107 -msoft-float -mno-soft-float -mhard-float -mno-hard-float -mfpu \
108 -mieee -mieee-with-inexact \
109 -mtls-direct-seg-refs -mno-tls-direct-seg-refs \
110 -mflat -mno-flat -mno-faster-structs -mfaster-structs \
111 -m32 -m64 -mabi -mlittle-endian -mbig-endian -EL -EB -fPIC \
112 -mlive-g0 -mcmodel -mstack-bias -mno-stack-bias"
113
114 # C[XX]FLAGS that we are think is ok, but needs testing
115 # NOTE: currently -Os have issues with gcc3 and K6* arch's
116 export UNSTABLE_FLAGS="-Os -O3 -freorder-blocks -fprefetch-loop-arrays"
117 return 0
118 }
119
120 filter-flags() {
121 local x f fset
122 declare -a new_CFLAGS new_CXXFLAGS
123
124 for x in "$@" ; do
125 case "${x}" in
126 -fPIC|-fpic|-fPIE|-fpie|-pie)
127 append-flags `test_flag -fno-pie`;;
128 -fstack-protector|-fstack-protector-all)
129 fstack-flags;;
130 esac
131 done
132
133 for fset in CFLAGS CXXFLAGS; do
134 # Looping over the flags instead of using a global
135 # substitution ensures that we're working with flag atoms.
136 # Otherwise globs like -O* have the potential to wipe out the
137 # list of flags.
138 for f in ${!fset}; do
139 for x in "$@"; do
140 # Note this should work with globs like -O*
141 [[ ${f} == ${x} ]] && continue 2
142 done
143 eval new_${fset}\[\${\#new_${fset}\[@]}]=\${f}
144 done
145 eval export ${fset}=\${new_${fset}\[*]}
146 done
147
148 return 0
149 }
150
151 filter-lfs-flags() {
152 filter-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
153 }
154
155 append-lfs-flags() {
156 append-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
157 }
158
159 append-flags() {
160 [[ -z $* ]] && return 0
161 export CFLAGS="${CFLAGS} $*"
162 export CXXFLAGS="${CXXFLAGS} $*"
163 [ -n "`is-flag -fno-stack-protector`" -o \
164 -n "`is-flag -fno-stack-protector-all`" ] && fstack-flags
165 return 0
166 }
167
168 replace-flags() {
169 local f fset
170 declare -a new_CFLAGS new_CXXFLAGS
171
172 for fset in CFLAGS CXXFLAGS; do
173 # Looping over the flags instead of using a global
174 # substitution ensures that we're working with flag atoms.
175 # Otherwise globs like -O* have the potential to wipe out the
176 # list of flags.
177 for f in ${!fset}; do
178 # Note this should work with globs like -O*
179 [[ ${f} == ${1} ]] && f=${2}
180 eval new_${fset}\[\${\#new_${fset}\[@]}]=\${f}
181 done
182 eval export ${fset}=\${new_${fset}\[*]}
183 done
184
185 return 0
186 }
187
188 replace-cpu-flags() {
189 local newcpu="$#" ; newcpu="${!newcpu}"
190 while [ $# -gt 1 ] ; do
191 # quote to make sure that no globbing is done (particularly on
192 # ${oldcpu} prior to calling replace-flags
193 replace-flags "-march=${1}" "-march=${newcpu}"
194 replace-flags "-mcpu=${1}" "-mcpu=${newcpu}"
195 replace-flags "-mtune=${1}" "-mtune=${newcpu}"
196 shift
197 done
198 return 0
199 }
200
201 is-flag() {
202 local x
203
204 for x in ${CFLAGS} ${CXXFLAGS} ; do
205 # Note this should work with globs like -mcpu=ultrasparc*
206 if [[ ${x} == ${1} ]]; then
207 echo true
208 return 0
209 fi
210 done
211 return 1
212 }
213
214 filter-mfpmath() {
215 local orig_mfpmath new_math prune_math
216
217 # save the original -mfpmath flag
218 orig_mfpmath="`get-flag -mfpmath`"
219 # get the value of the current -mfpmath flag
220 new_math=" `get-flag mfpmath | tr , ' '` "
221 # figure out which math values are to be removed
222 prune_math=""
223 for prune_math in "$@" ; do
224 new_math="${new_math/ ${prune_math} / }"
225 done
226 new_math="`echo ${new_math:1:${#new_math}-2} | tr ' ' ,`"
227
228 if [ -z "${new_math}" ] ; then
229 # if we're removing all user specified math values are
230 # slated for removal, then we just filter the flag
231 filter-flags ${orig_mfpmath}
232 else
233 # if we only want to filter some of the user specified
234 # math values, then we replace the current flag
235 replace-flags ${orig_mfpmath} -mfpmath=${new_math}
236 fi
237 return 0
238 }
239
240 strip-flags() {
241 local x y flag NEW_CFLAGS NEW_CXXFLAGS
242
243 setup-allowed-flags
244
245 local NEW_CFLAGS=""
246 local NEW_CXXFLAGS=""
247
248 # Allow unstable C[XX]FLAGS if we are using unstable profile ...
249 if has ~$(tc-arch) ${ACCEPT_KEYWORDS} ; then
250 ALLOWED_FLAGS="${ALLOWED_FLAGS} ${UNSTABLE_FLAGS}"
251 fi
252
253 set -f # disable pathname expansion
254
255 for x in ${CFLAGS}; do
256 for y in ${ALLOWED_FLAGS}; do
257 flag=${x%%=*}
258 if [ "${flag%%${y}}" = "" ] ; then
259 NEW_CFLAGS="${NEW_CFLAGS} ${x}"
260 break
261 fi
262 done
263 done
264
265 for x in ${CXXFLAGS}; do
266 for y in ${ALLOWED_FLAGS}; do
267 flag=${x%%=*}
268 if [ "${flag%%${y}}" = "" ] ; then
269 NEW_CXXFLAGS="${NEW_CXXFLAGS} ${x}"
270 break
271 fi
272 done
273 done
274
275 # In case we filtered out all optimization flags fallback to -O2
276 if [ "${CFLAGS/-O}" != "${CFLAGS}" -a "${NEW_CFLAGS/-O}" = "${NEW_CFLAGS}" ]; then
277 NEW_CFLAGS="${NEW_CFLAGS} -O2"
278 fi
279 if [ "${CXXFLAGS/-O}" != "${CXXFLAGS}" -a "${NEW_CXXFLAGS/-O}" = "${NEW_CXXFLAGS}" ]; then
280 NEW_CXXFLAGS="${NEW_CXXFLAGS} -O2"
281 fi
282
283 set +f # re-enable pathname expansion
284
285 export CFLAGS="${NEW_CFLAGS}"
286 export CXXFLAGS="${NEW_CXXFLAGS}"
287 return 0
288 }
289
290 test_flag() {
291 if $(tc-getCC) -S -xc "$@" -o "$(emktemp)" /dev/null &>/dev/null; then
292 printf "%s\n" "$*"
293 return 0
294 fi
295 return 1
296 }
297
298 test_version_info() {
299 if [[ $($(tc-getCC) --version 2>&1) == *$1* ]]; then
300 return 0
301 else
302 return 1
303 fi
304 }
305
306 strip-unsupported-flags() {
307 local NEW_CFLAGS NEW_CXXFLAGS
308
309 for x in ${CFLAGS} ; do
310 NEW_CFLAGS="${NEW_CFLAGS} `test_flag ${x}`"
311 done
312 for x in ${CXXFLAGS} ; do
313 NEW_CXXFLAGS="${NEW_CXXFLAGS} `test_flag ${x}`"
314 done
315
316 export CFLAGS="${NEW_CFLAGS}"
317 export CXXFLAGS="${NEW_CXXFLAGS}"
318 }
319
320 get-flag() {
321 local f findflag="$1"
322
323 # this code looks a little flaky but seems to work for
324 # everything we want ...
325 # for example, if CFLAGS="-march=i686":
326 # `get-flag -march` == "-march=i686"
327 # `get-flag march` == "i686"
328 for f in ${CFLAGS} ${CXXFLAGS} ; do
329 if [ "${f/${findflag}}" != "${f}" ] ; then
330 printf "%s\n" "${f/-${findflag}=}"
331 return 0
332 fi
333 done
334 return 1
335 }
336
337 # DEPRECATED - use gcc-specs-relro or gcc-specs-now from toolchain-funcs
338 has_hardened() {
339 test_version_info Hardened && return 0
340 # the specs file wont exist unless gcc has GCC_SPECS support
341 [ -f "${GCC_SPECS}" -a "${GCC_SPECS}" != "${GCC_SPECS/hardened/}" ] && \
342 return 0
343 return 1
344 }
345
346 # DEPRECATED - use gcc-specs-pie from toolchain-funcs
347 # indicate whether PIC is set
348 has_pic() {
349 [ "${CFLAGS/-fPIC}" != "${CFLAGS}" ] && return 0
350 [ "${CFLAGS/-fpic}" != "${CFLAGS}" ] && return 0
351 [ "$(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __PIC__)" ] && return 0
352 return 1
353 }
354
355 # DEPRECATED - use gcc-specs-pie from toolchain-funcs
356 # indicate whether PIE is set
357 has_pie() {
358 [ "${CFLAGS/-fPIE}" != "${CFLAGS}" ] && return 0
359 [ "${CFLAGS/-fpie}" != "${CFLAGS}" ] && return 0
360 [ "$(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __PIE__)" ] && return 0
361 # test PIC while waiting for specs to be updated to generate __PIE__
362 [ "$(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __PIC__)" ] && return 0
363 return 1
364 }
365
366 # DEPRECATED - use gcc-specs-ssp from toolchain-funcs
367 # indicate whether code for SSP is being generated for all functions
368 has_ssp_all() {
369 # note; this matches only -fstack-protector-all
370 [ "${CFLAGS/-fstack-protector-all}" != "${CFLAGS}" ] && return 0
371 [ "$(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __SSP_ALL__)" ] && return 0
372 gcc-specs-ssp && return 0
373 return 1
374 }
375
376 # DEPRECATED - use gcc-specs-ssp from toolchain-funcs
377 # indicate whether code for SSP is being generated
378 has_ssp() {
379 # note; this matches both -fstack-protector and -fstack-protector-all
380 [ "${CFLAGS/-fstack-protector}" != "${CFLAGS}" ] && return 0
381 [ "$(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __SSP__)" ] && return 0
382 gcc-specs-ssp && return 0
383 return 1
384 }
385
386 has_m64() {
387 # this doesnt test if the flag is accepted, it tests if the flag
388 # actually -WORKS-. non-multilib gcc will take both -m32 and -m64!
389 # please dont replace this function with test_flag in some future
390 # clean-up!
391 local temp="$(emktemp)"
392 echo "int main() { return(0); }" > ${temp}.c
393 MY_CC=$(tc-getCC)
394 ${MY_CC/ .*/} -m64 -o "$(emktemp)" ${temp}.c > /dev/null 2>&1
395 local ret=$?
396 rm -f ${temp}.c
397 [ "$ret" != "1" ] && return 0
398 return 1
399 }
400
401 has_m32() {
402 # this doesnt test if the flag is accepted, it tests if the flag
403 # actually -WORKS-. non-multilib gcc will take both -m32 and -m64!
404 # please dont replace this function with test_flag in some future
405 # clean-up!
406
407 [ "$(tc-arch)" = "amd64" ] && has_multilib_profile && return 0
408
409 local temp="$(emktemp)"
410 echo "int main() { return(0); }" > ${temp}.c
411 MY_CC=$(tc-getCC)
412 ${MY_CC/ .*/} -m32 -o "$(emktemp)" ${temp}.c > /dev/null 2>&1
413 local ret=$?
414 rm -f ${temp}.c
415 [ "$ret" != "1" ] && return 0
416 return 1
417 }
418
419 replace-sparc64-flags() {
420 local SPARC64_CPUS="ultrasparc v9"
421
422 if [ "${CFLAGS/mtune}" != "${CFLAGS}" ]; then
423 for x in ${SPARC64_CPUS}; do
424 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8}"
425 done
426 else
427 for x in ${SPARC64_CPUS}; do
428 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
429 done
430 fi
431
432 if [ "${CXXFLAGS/mtune}" != "${CXXFLAGS}" ]; then
433 for x in ${SPARC64_CPUS}; do
434 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8}"
435 done
436 else
437 for x in ${SPARC64_CPUS}; do
438 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
439 done
440 fi
441
442 export CFLAGS CXXFLAGS
443 }
444
445 append-ldflags() {
446 export LDFLAGS="${LDFLAGS} $*"
447 return 0
448 }
449
450 filter-ldflags() {
451 local x
452
453 # we do this fancy spacing stuff so as to not filter
454 # out part of a flag ... we want flag atoms ! :D
455 LDFLAGS=" ${LDFLAGS} "
456 for x in "$@" ; do
457 LDFLAGS=${LDFLAGS// ${x} / }
458 done
459 [[ -z ${LDFLAGS// } ]] \
460 && LDFLAGS="" \
461 || LDFLAGS=${LDFLAGS:1:${#LDFLAGS}-2}
462 export LDFLAGS
463 return 0
464 }
465
466 fstack-flags() {
467 if gcc-specs-ssp; then
468 [ -z "`is-flag -fno-stack-protector`" ] &&
469 export CFLAGS="${CFLAGS} `test_flag -fno-stack-protector`"
470 fi
471 return 0
472 }
473
474 # This is thanks to great work from Paul de Vrieze <gentoo-user@devrieze.net>,
475 # bug #9016. Also thanks to Jukka Salmi <salmi@gmx.net> (bug #13907) for more
476 # fixes.
477 #
478 # Export CFLAGS and CXXFLAGS that are compadible with gcc-2.95.3
479 gcc2-flags() {
480 if [[ $(tc-arch) == "x86" || $(tc-arch) == "amd64" ]] ; then
481 CFLAGS=${CFLAGS//-mtune=/-mcpu=}
482 CXXFLAGS=${CXXFLAGS//-mtune=/-mcpu=}
483 fi
484
485 replace-cpu-flags k6-{2,3} k6
486 replace-cpu-flags athlon{,-{tbird,4,xp,mp}} i686
487
488 replace-cpu-flags pentium-mmx i586
489 replace-cpu-flags pentium{2,3,4} i686
490
491 replace-cpu-flags ev6{7,8} ev6
492
493 export CFLAGS CXXFLAGS
494 }

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