/[gentoo-x86]/eclass/flag-o-matic.eclass
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Revision 1.58 - (show annotations) (download)
Thu Jun 10 15:28:56 2004 UTC (10 years, 3 months ago) by agriffis
Branch: MAIN
Changes since 1.57: +76 -78 lines
- Localize variables in functions
- Rewrite test_flag to honor ${CC}
- Add function test_version_info to run ${CC} --version and look for
  patterns
- Use printf instead of echo in situations where flags are being
  printed.  This avoids the possibility that echo will interpret the
  flags, for example -n
- Modify has_hardened, has_pic, has_pie to use test_version_info.
  This also fixes mistakes in ${var/pattern} expressions; many
  patterns in this eclass were erroneously written to be regular
  expressions instead of globs.
- Modify has_m64, has_m32 to use test_flag

1 # Copyright 1999-2003 Gentoo Technologies, Inc.
2 # Distributed under the terms of the GNU General Public License v2
3 # $Header: /var/cvsroot/gentoo-x86/eclass/flag-o-matic.eclass,v 1.57 2004/06/10 00:41:44 lv Exp $
4 #
5 # Author Bart Verwilst <verwilst@gentoo.org>
6
7 ECLASS=flag-o-matic
8 INHERITED="$INHERITED $ECLASS"
9 IUSE="$IUSE debug"
10
11 #
12 #### filter-flags <flags> ####
13 # Remove particular flags from C[XX]FLAGS
14 # Matches only complete flags
15 #
16 #### append-flags <flags> ####
17 # Add extra flags to your current C[XX]FLAGS
18 #
19 #### replace-flags <orig.flag> <new.flag> ###
20 # Replace a flag by another one
21 #
22 #### replace-cpu-flags <new.cpu> <old.cpus> ###
23 # Replace march/mcpu flags that specify <old.cpus>
24 # with flags that specify <new.cpu>
25 #
26 #### is-flag <flag> ####
27 # Returns "true" if flag is set in C[XX]FLAGS
28 # Matches only complete a flag
29 #
30 #### strip-flags ####
31 # Strip C[XX]FLAGS of everything except known
32 # good options.
33 #
34 #### strip-unsupported-flags ####
35 # Strip C[XX]FLAGS of any flags not supported by
36 # installed version of gcc
37 #
38 #### get-flag <flag> ####
39 # Find and echo the value for a particular flag
40 #
41 #### replace-sparc64-flags ####
42 # Sets mcpu to v8 and uses the original value
43 # as mtune if none specified.
44 #
45 #### filter-mfpmath <math types> ####
46 # Remove specified math types from the fpmath specification
47 # If the user has -mfpmath=sse,386, running `filter-mfpmath sse`
48 # will leave the user with -mfpmath=386
49 #
50 #### append-ldflags ####
51 # Add extra flags to your current LDFLAGS
52 #
53 #### filter-ldflags <flags> ####
54 # Remove particular flags from LDFLAGS
55 # Matches only complete flags
56 #
57 #### etexec-flags ####
58 # hooked function for hardened gcc that appends
59 # -fno-pic to {C,CXX,LD}FLAGS
60 # when a package is filtering -fpic, -fPIC, -fpie, -fPIE
61 #
62 #### fstack-flags ####
63 # hooked function for hardened gcc that appends
64 # -fno-stack-protector to {C,CXX,LD}FLAGS
65 # when a package is filtering -fstack-protector, -fstack-protector-all
66 # notice: modern automatic specs files will also suppress -fstack-protector-all
67 # when only -fno-stack-protector is given
68 #
69
70 # C[XX]FLAGS that we allow in strip-flags
71 setup-allowed-flags() {
72 if [ -z "${ALLOWED_FLAGS}" ] ; then
73 export ALLOWED_FLAGS="-O -O1 -O2 -mcpu -march -mtune -fstack-protector -fno-unit-at-a-time -pipe -g"
74 case "${ARCH}" in
75 mips) ALLOWED_FLAGS="${ALLOWED_FLAGS} -mips1 -mips2 -mips3 -mips4 -mabi" ;;
76 amd64) ALLOWED_FLAGS="${ALLOWED_FLAGS} -fPIC -m64" ;;
77 x86) ALLOWED_FLAGS="${ALLOWED_FLAGS} -m32" ;;
78 alpha) ALLOWED_FLAGS="${ALLOWED_FLAGS} -fPIC" ;;
79 ia64) ALLOWED_FLAGS="${ALLOWED_FLAGS} -fPIC" ;;
80 esac
81 fi
82
83 # C[XX]FLAGS that we are think is ok, but needs testing
84 # NOTE: currently -Os have issues with gcc3 and K6* arch's
85 export UNSTABLE_FLAGS="-Os -O3 -freorder-blocks -fprefetch-loop-arrays"
86 return 0
87 }
88
89 filter-flags() {
90 local x
91
92 for x in "$@" ; do
93 case "${x}" in
94 -fPIC|-fpic|-fPIE|-fpie|-pie) etexec-flags;;
95 -fstack-protector|-fstack-protector-all) fstack-flags;;
96 *) ;;
97 esac
98 done
99
100 # we do this fancy spacing stuff so as to not filter
101 # out part of a flag ... we want flag atoms ! :D
102 CFLAGS=" ${CFLAGS} "
103 CXXFLAGS=" ${CXXFLAGS} "
104 for x in "$@" ; do
105 CFLAGS="${CFLAGS// ${x} / }"
106 CXXFLAGS="${CXXFLAGS// ${x} / }"
107 done
108 CFLAGS="${CFLAGS:1:${#CFLAGS}-2}"
109 CXXFLAGS="${CXXFLAGS:1:${#CXXFLAGS}-2}"
110 return 0
111 }
112
113 filter-lfs-flags() {
114 filter-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
115 }
116
117 append-lfs-flags() {
118 append-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
119 }
120
121 append-flags() {
122 export CFLAGS="${CFLAGS} $*"
123 export CXXFLAGS="${CXXFLAGS} $*"
124 [ -n "`is-flag -fno-stack-protector`" -o \
125 -n "`is-flag -fno-stack-protector-all`" ] && fstack-flags
126 return 0
127 }
128
129 replace-flags() {
130 # we do this fancy spacing stuff so as to not filter
131 # out part of a flag ... we want flag atoms ! :D
132 CFLAGS=" ${CFLAGS} "
133 CXXFLAGS=" ${CXXFLAGS} "
134 CFLAGS="${CFLAGS// ${1} / ${2} }"
135 CXXFLAGS="${CXXFLAGS// ${1} / ${2} }"
136 CFLAGS="${CFLAGS:1:${#CFLAGS}-2}"
137 CXXFLAGS="${CXXFLAGS:1:${#CXXFLAGS}-2}"
138 return 0
139 }
140
141 replace-cpu-flags() {
142 local oldcpu newcpu="$1" ; shift
143 for oldcpu in "$@" ; do
144 replace-flags -march=${oldcpu} -march=${newcpu}
145 replace-flags -mcpu=${oldcpu} -mcpu=${newcpu}
146 replace-flags -mtune=${oldcpu} -mtune=${newcpu}
147 done
148 return 0
149 }
150
151 is-flag() {
152 local x
153
154 for x in ${CFLAGS} ${CXXFLAGS} ; do
155 if [ "${x}" == "$1" ] ; then
156 echo true
157 return 0
158 fi
159 done
160 return 1
161 }
162
163 filter-mfpmath() {
164 local orig_mfpmath new_math prune_math
165
166 # save the original -mfpmath flag
167 orig_mfpmath="`get-flag -mfpmath`"
168 # get the value of the current -mfpmath flag
169 new_math=" `get-flag mfpmath | tr , ' '` "
170 # figure out which math values are to be removed
171 prune_math=""
172 for prune_math in "$@" ; do
173 new_math="${new_math/ ${prune_math} / }"
174 done
175 new_math="`echo ${new_math:1:${#new_math}-2} | tr ' ' ,`"
176
177 if [ -z "${new_math}" ] ; then
178 # if we're removing all user specified math values are
179 # slated for removal, then we just filter the flag
180 filter-flags ${orig_mfpmath}
181 else
182 # if we only want to filter some of the user specified
183 # math values, then we replace the current flag
184 replace-flags ${orig_mfpmath} -mfpmath=${new_math}
185 fi
186 return 0
187 }
188
189 strip-flags() {
190 local x y flag NEW_CFLAGS NEW_CXXFLAGS
191
192 setup-allowed-flags
193
194 local NEW_CFLAGS=""
195 local NEW_CXXFLAGS=""
196
197 # Allow unstable C[XX]FLAGS if we are using unstable profile ...
198 if has ~${ARCH} ${ACCEPT_KEYWORDS} ; then
199 use debug && einfo "Enabling the use of some unstable flags"
200 ALLOWED_FLAGS="${ALLOWED_FLAGS} ${UNSTABLE_FLAGS}"
201 fi
202
203 set -f # disable pathname expansion
204
205 for x in ${CFLAGS}; do
206 for y in ${ALLOWED_FLAGS}; do
207 flag=${x%%=*}
208 if [ "${flag%%${y}}" = "" ]; then
209 NEW_CFLAGS="${NEW_CFLAGS} ${x}"
210 break
211 fi
212 done
213 done
214
215 for x in ${CXXFLAGS}; do
216 for y in ${ALLOWED_FLAGS}; do
217 flag=${x%%=*}
218 if [ "${flag%%${y}}" = "" ]; then
219 NEW_CXXFLAGS="${NEW_CXXFLAGS} ${x}"
220 break
221 fi
222 done
223 done
224
225 # In case we filtered out all optimization flags fallback to -O2
226 if [ "${CFLAGS/-O}" != "${CFLAGS}" -a "${NEW_CFLAGS/-O}" = "${NEW_CFLAGS}" ]; then
227 NEW_CFLAGS="${NEW_CFLAGS} -O2"
228 fi
229 if [ "${CXXFLAGS/-O}" != "${CXXFLAGS}" -a "${NEW_CXXFLAGS/-O}" = "${NEW_CXXFLAGS}" ]; then
230 NEW_CXXFLAGS="${NEW_CXXFLAGS} -O2"
231 fi
232
233 set +f # re-enable pathname expansion
234
235 useq debug \
236 && einfo "CFLAGS=\"${NEW_CFLAGS}\"" \
237 && einfo "CXXFLAGS=\"${NEW_CXXFLAGS}\""
238
239 export CFLAGS="${NEW_CFLAGS}"
240 export CXXFLAGS="${NEW_CXXFLAGS}"
241 return 0
242 }
243
244 test_flag() {
245 local cc=${CC:-gcc} ; cc=${cc%% *}
246 if ${cc} -S -xc "$@" -o /dev/null /dev/null &>/dev/null; then
247 printf "%s\n" "$*"
248 return 0
249 fi
250 return 1
251 }
252
253 test_version_info() {
254 local cc=${CC:-gcc} ; cc=${cc%% *}
255 if [[ $(${cc} --version 2>&1) == *$1* ]]; then
256 return 0
257 else
258 return 1
259 fi
260 }
261
262 strip-unsupported-flags() {
263 local NEW_CFLAGS NEW_CXXFLAGS
264
265 for x in ${CFLAGS} ; do
266 NEW_CFLAGS="${NEW_CFLAGS} `test_flag ${x}`"
267 done
268 for x in ${CXXFLAGS} ; do
269 NEW_CXXFLAGS="${NEW_CXXFLAGS} `test_flag ${x}`"
270 done
271
272 export CFLAGS="${NEW_CFLAGS}"
273 export CXXFLAGS="${NEW_CXXFLAGS}"
274 }
275
276 get-flag() {
277 local f findflag="$1"
278
279 # this code looks a little flaky but seems to work for
280 # everything we want ...
281 # for example, if CFLAGS="-march=i686":
282 # `get-flag -march` == "-march=i686"
283 # `get-flag march` == "i686"
284 for f in ${CFLAGS} ${CXXFLAGS} ; do
285 if [ "${f/${findflag}}" != "${f}" ] ; then
286 printf "%s\n" "${f/-${findflag}=}"
287 return 0
288 fi
289 done
290 return 1
291 }
292
293 has_hardened() {
294 test_version_info Hardened
295 return $?
296 }
297
298 has_pic() {
299 [ "${CFLAGS/-fPIC}" != "${CFLAGS}" ] && return 0
300 [ "${CFLAGS/-fpic}" != "${CFLAGS}" ] && return 0
301 test_version_info pie && return 0
302 return 1
303 }
304
305 has_pie() {
306 [ "${CFLAGS/-fPIE}" != "${CFLAGS}" ] && return 0
307 [ "${CFLAGS/-fpie}" != "${CFLAGS}" ] && return 0
308 test_version_info pie && return 0
309 return 1
310 }
311
312 has_ssp() {
313 [ "${CFLAGS/-fstack-protector}" != "${CFLAGS}" ] && return 0
314 test_version_info ssp && return 0
315 return 1
316 }
317
318 has_m64() {
319 test_flag -m64
320 return $?
321 }
322
323 has_m32() {
324 test_flag -m32
325 return $?
326 }
327
328 replace-sparc64-flags() {
329 local SPARC64_CPUS="ultrasparc v9"
330
331 if [ "${CFLAGS/mtune}" != "${CFLAGS}" ]; then
332 for x in ${SPARC64_CPUS}; do
333 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8}"
334 done
335 else
336 for x in ${SPARC64_CPUS}; do
337 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
338 done
339 fi
340
341 if [ "${CXXFLAGS/mtune}" != "${CXXFLAGS}" ]; then
342 for x in ${SPARC64_CPUS}; do
343 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8}"
344 done
345 else
346 for x in ${SPARC64_CPUS}; do
347 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
348 done
349 fi
350 }
351
352 append-ldflags() {
353 LDFLAGS="${LDFLAGS} $*"
354 return 0
355 }
356
357 filter-ldflags() {
358 local x
359
360 # we do this fancy spacing stuff so as to not filter
361 # out part of a flag ... we want flag atoms ! :D
362 LDFLAGS=" ${LDFLAGS} "
363 for x in "$@" ; do
364 LDFLAGS="${LDFLAGS// ${x} / }"
365 done
366 LDFLAGS="${LDFLAGS:1:${#LDFLAGS}-2}"
367 return 0
368 }
369
370 etexec-flags() {
371 # if you're not using a hardened compiler you wont need this
372 # PIC/no-pic kludge in the first place.
373 has_hardened || return 0
374
375 if has_pie || has_pic; then
376 [ -z "`is-flag -fno-pic`" ] &&
377 export CFLAGS="${CFLAGS} `test_flag -fno-pic`"
378 [ -z "`is-flag -nopie`" ] &&
379 export CFLAGS="${CFLAGS} `test_flag -nopie`"
380 fi
381 return 0
382 }
383
384 fstack-flags() {
385 if has_ssp; then
386 [ -z "`is-flag -fno-stack-protector`" ] &&
387 export CFLAGS="${CFLAGS} `test_flag -fno-stack-protector`"
388 fi
389 return 0
390 }

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