/[gentoo-x86]/eclass/flag-o-matic.eclass
Gentoo

Contents of /eclass/flag-o-matic.eclass

Parent Directory Parent Directory | Revision Log Revision Log


Revision 1.93 - (show annotations) (download)
Tue Sep 27 01:06:47 2005 UTC (8 years, 6 months ago) by vapier
Branch: MAIN
Changes since 1.92: +7 -1 lines
add some sanity checks to make sure people use these functions correctly

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 1.92 2005/08/01 10:50:55 kevquinn 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 [[ -n $@ ]] && die "filter-lfs-flags takes no arguments"
153 filter-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
154 }
155
156 append-lfs-flags() {
157 [[ -n $@ ]] && die "append-lfs-flags takes no arguments"
158 append-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
159 }
160
161 append-flags() {
162 [[ -z $* ]] && return 0
163 export CFLAGS="${CFLAGS} $*"
164 export CXXFLAGS="${CXXFLAGS} $*"
165 [ -n "`is-flag -fno-stack-protector`" -o \
166 -n "`is-flag -fno-stack-protector-all`" ] && fstack-flags
167 return 0
168 }
169
170 replace-flags() {
171 [[ $# != 2 ]] \
172 && echo && eerror "Usage: replace-flags <old flag> <new flag>" \
173 && die "replace-flags takes 2 arguments, not $#"
174
175 local f fset
176 declare -a new_CFLAGS new_CXXFLAGS
177
178 for fset in CFLAGS CXXFLAGS; do
179 # Looping over the flags instead of using a global
180 # substitution ensures that we're working with flag atoms.
181 # Otherwise globs like -O* have the potential to wipe out the
182 # list of flags.
183 for f in ${!fset}; do
184 # Note this should work with globs like -O*
185 [[ ${f} == ${1} ]] && f=${2}
186 eval new_${fset}\[\${\#new_${fset}\[@]}]=\${f}
187 done
188 eval export ${fset}=\${new_${fset}\[*]}
189 done
190
191 return 0
192 }
193
194 replace-cpu-flags() {
195 local newcpu="$#" ; newcpu="${!newcpu}"
196 while [ $# -gt 1 ] ; do
197 # quote to make sure that no globbing is done (particularly on
198 # ${oldcpu} prior to calling replace-flags
199 replace-flags "-march=${1}" "-march=${newcpu}"
200 replace-flags "-mcpu=${1}" "-mcpu=${newcpu}"
201 replace-flags "-mtune=${1}" "-mtune=${newcpu}"
202 shift
203 done
204 return 0
205 }
206
207 is-flag() {
208 local x
209
210 for x in ${CFLAGS} ${CXXFLAGS} ; do
211 # Note this should work with globs like -mcpu=ultrasparc*
212 if [[ ${x} == ${1} ]]; then
213 echo true
214 return 0
215 fi
216 done
217 return 1
218 }
219
220 filter-mfpmath() {
221 local orig_mfpmath new_math prune_math
222
223 # save the original -mfpmath flag
224 orig_mfpmath="`get-flag -mfpmath`"
225 # get the value of the current -mfpmath flag
226 new_math=" `get-flag mfpmath | tr , ' '` "
227 # figure out which math values are to be removed
228 prune_math=""
229 for prune_math in "$@" ; do
230 new_math="${new_math/ ${prune_math} / }"
231 done
232 new_math="`echo ${new_math:1:${#new_math}-2} | tr ' ' ,`"
233
234 if [ -z "${new_math}" ] ; then
235 # if we're removing all user specified math values are
236 # slated for removal, then we just filter the flag
237 filter-flags ${orig_mfpmath}
238 else
239 # if we only want to filter some of the user specified
240 # math values, then we replace the current flag
241 replace-flags ${orig_mfpmath} -mfpmath=${new_math}
242 fi
243 return 0
244 }
245
246 strip-flags() {
247 local x y flag NEW_CFLAGS NEW_CXXFLAGS
248
249 setup-allowed-flags
250
251 local NEW_CFLAGS=""
252 local NEW_CXXFLAGS=""
253
254 # Allow unstable C[XX]FLAGS if we are using unstable profile ...
255 if has ~$(tc-arch) ${ACCEPT_KEYWORDS} ; then
256 ALLOWED_FLAGS="${ALLOWED_FLAGS} ${UNSTABLE_FLAGS}"
257 fi
258
259 set -f # disable pathname expansion
260
261 for x in ${CFLAGS}; do
262 for y in ${ALLOWED_FLAGS}; do
263 flag=${x%%=*}
264 if [ "${flag%%${y}}" = "" ] ; then
265 NEW_CFLAGS="${NEW_CFLAGS} ${x}"
266 break
267 fi
268 done
269 done
270
271 for x in ${CXXFLAGS}; do
272 for y in ${ALLOWED_FLAGS}; do
273 flag=${x%%=*}
274 if [ "${flag%%${y}}" = "" ] ; then
275 NEW_CXXFLAGS="${NEW_CXXFLAGS} ${x}"
276 break
277 fi
278 done
279 done
280
281 # In case we filtered out all optimization flags fallback to -O2
282 if [ "${CFLAGS/-O}" != "${CFLAGS}" -a "${NEW_CFLAGS/-O}" = "${NEW_CFLAGS}" ]; then
283 NEW_CFLAGS="${NEW_CFLAGS} -O2"
284 fi
285 if [ "${CXXFLAGS/-O}" != "${CXXFLAGS}" -a "${NEW_CXXFLAGS/-O}" = "${NEW_CXXFLAGS}" ]; then
286 NEW_CXXFLAGS="${NEW_CXXFLAGS} -O2"
287 fi
288
289 set +f # re-enable pathname expansion
290
291 export CFLAGS="${NEW_CFLAGS}"
292 export CXXFLAGS="${NEW_CXXFLAGS}"
293 return 0
294 }
295
296 test_flag() {
297 if $(tc-getCC) -S -xc "$@" -o "$(emktemp)" /dev/null &>/dev/null; then
298 printf "%s\n" "$*"
299 return 0
300 fi
301 return 1
302 }
303
304 test_version_info() {
305 if [[ $($(tc-getCC) --version 2>&1) == *$1* ]]; then
306 return 0
307 else
308 return 1
309 fi
310 }
311
312 strip-unsupported-flags() {
313 local NEW_CFLAGS NEW_CXXFLAGS
314
315 for x in ${CFLAGS} ; do
316 NEW_CFLAGS="${NEW_CFLAGS} `test_flag ${x}`"
317 done
318 for x in ${CXXFLAGS} ; do
319 NEW_CXXFLAGS="${NEW_CXXFLAGS} `test_flag ${x}`"
320 done
321
322 export CFLAGS="${NEW_CFLAGS}"
323 export CXXFLAGS="${NEW_CXXFLAGS}"
324 }
325
326 get-flag() {
327 local f findflag="$1"
328
329 # this code looks a little flaky but seems to work for
330 # everything we want ...
331 # for example, if CFLAGS="-march=i686":
332 # `get-flag -march` == "-march=i686"
333 # `get-flag march` == "i686"
334 for f in ${CFLAGS} ${CXXFLAGS} ; do
335 if [ "${f/${findflag}}" != "${f}" ] ; then
336 printf "%s\n" "${f/-${findflag}=}"
337 return 0
338 fi
339 done
340 return 1
341 }
342
343 # DEPRECATED - use gcc-specs-relro or gcc-specs-now from toolchain-funcs
344 has_hardened() {
345 test_version_info Hardened && return 0
346 # the specs file wont exist unless gcc has GCC_SPECS support
347 [ -f "${GCC_SPECS}" -a "${GCC_SPECS}" != "${GCC_SPECS/hardened/}" ] && \
348 return 0
349 return 1
350 }
351
352 # DEPRECATED - use gcc-specs-pie from toolchain-funcs
353 # indicate whether PIC is set
354 has_pic() {
355 [ "${CFLAGS/-fPIC}" != "${CFLAGS}" ] && return 0
356 [ "${CFLAGS/-fpic}" != "${CFLAGS}" ] && return 0
357 [ "$(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __PIC__)" ] && return 0
358 return 1
359 }
360
361 # DEPRECATED - use gcc-specs-pie from toolchain-funcs
362 # indicate whether PIE is set
363 has_pie() {
364 [ "${CFLAGS/-fPIE}" != "${CFLAGS}" ] && return 0
365 [ "${CFLAGS/-fpie}" != "${CFLAGS}" ] && return 0
366 [ "$(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __PIE__)" ] && return 0
367 # test PIC while waiting for specs to be updated to generate __PIE__
368 [ "$(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __PIC__)" ] && return 0
369 return 1
370 }
371
372 # DEPRECATED - use gcc-specs-ssp from toolchain-funcs
373 # indicate whether code for SSP is being generated for all functions
374 has_ssp_all() {
375 # note; this matches only -fstack-protector-all
376 [ "${CFLAGS/-fstack-protector-all}" != "${CFLAGS}" ] && return 0
377 [ "$(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __SSP_ALL__)" ] && return 0
378 gcc-specs-ssp && return 0
379 return 1
380 }
381
382 # DEPRECATED - use gcc-specs-ssp from toolchain-funcs
383 # indicate whether code for SSP is being generated
384 has_ssp() {
385 # note; this matches both -fstack-protector and -fstack-protector-all
386 [ "${CFLAGS/-fstack-protector}" != "${CFLAGS}" ] && return 0
387 [ "$(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __SSP__)" ] && return 0
388 gcc-specs-ssp && return 0
389 return 1
390 }
391
392 has_m64() {
393 # this doesnt test if the flag is accepted, it tests if the flag
394 # actually -WORKS-. non-multilib gcc will take both -m32 and -m64!
395 # please dont replace this function with test_flag in some future
396 # clean-up!
397 local temp="$(emktemp)"
398 echo "int main() { return(0); }" > ${temp}.c
399 MY_CC=$(tc-getCC)
400 ${MY_CC/ .*/} -m64 -o "$(emktemp)" ${temp}.c > /dev/null 2>&1
401 local ret=$?
402 rm -f ${temp}.c
403 [ "$ret" != "1" ] && return 0
404 return 1
405 }
406
407 has_m32() {
408 # this doesnt test if the flag is accepted, it tests if the flag
409 # actually -WORKS-. non-multilib gcc will take both -m32 and -m64!
410 # please dont replace this function with test_flag in some future
411 # clean-up!
412
413 [ "$(tc-arch)" = "amd64" ] && has_multilib_profile && return 0
414
415 local temp="$(emktemp)"
416 echo "int main() { return(0); }" > ${temp}.c
417 MY_CC=$(tc-getCC)
418 ${MY_CC/ .*/} -m32 -o "$(emktemp)" ${temp}.c > /dev/null 2>&1
419 local ret=$?
420 rm -f ${temp}.c
421 [ "$ret" != "1" ] && return 0
422 return 1
423 }
424
425 replace-sparc64-flags() {
426 local SPARC64_CPUS="ultrasparc v9"
427
428 if [ "${CFLAGS/mtune}" != "${CFLAGS}" ]; then
429 for x in ${SPARC64_CPUS}; do
430 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8}"
431 done
432 else
433 for x in ${SPARC64_CPUS}; do
434 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
435 done
436 fi
437
438 if [ "${CXXFLAGS/mtune}" != "${CXXFLAGS}" ]; then
439 for x in ${SPARC64_CPUS}; do
440 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8}"
441 done
442 else
443 for x in ${SPARC64_CPUS}; do
444 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
445 done
446 fi
447
448 export CFLAGS CXXFLAGS
449 }
450
451 append-ldflags() {
452 export LDFLAGS="${LDFLAGS} $*"
453 return 0
454 }
455
456 filter-ldflags() {
457 local x
458
459 # we do this fancy spacing stuff so as to not filter
460 # out part of a flag ... we want flag atoms ! :D
461 LDFLAGS=" ${LDFLAGS} "
462 for x in "$@" ; do
463 LDFLAGS=${LDFLAGS// ${x} / }
464 done
465 [[ -z ${LDFLAGS// } ]] \
466 && LDFLAGS="" \
467 || LDFLAGS=${LDFLAGS:1:${#LDFLAGS}-2}
468 export LDFLAGS
469 return 0
470 }
471
472 fstack-flags() {
473 if gcc-specs-ssp; then
474 [ -z "`is-flag -fno-stack-protector`" ] &&
475 export CFLAGS="${CFLAGS} `test_flag -fno-stack-protector`"
476 fi
477 return 0
478 }
479
480 # This is thanks to great work from Paul de Vrieze <gentoo-user@devrieze.net>,
481 # bug #9016. Also thanks to Jukka Salmi <salmi@gmx.net> (bug #13907) for more
482 # fixes.
483 #
484 # Export CFLAGS and CXXFLAGS that are compadible with gcc-2.95.3
485 gcc2-flags() {
486 if [[ $(tc-arch) == "x86" || $(tc-arch) == "amd64" ]] ; then
487 CFLAGS=${CFLAGS//-mtune=/-mcpu=}
488 CXXFLAGS=${CXXFLAGS//-mtune=/-mcpu=}
489 fi
490
491 replace-cpu-flags k6-{2,3} k6
492 replace-cpu-flags athlon{,-{tbird,4,xp,mp}} i686
493
494 replace-cpu-flags pentium-mmx i586
495 replace-cpu-flags pentium{2,3,4} i686
496
497 replace-cpu-flags ev6{7,8} ev6
498
499 export CFLAGS CXXFLAGS
500 }

  ViewVC Help
Powered by ViewVC 1.1.20