/[gentoo-x86]/eclass/flag-o-matic.eclass
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Revision 1.42 - (show annotations) (download)
Tue Apr 6 03:45:00 2004 UTC (10 years, 3 months ago) by tseng
Branch: MAIN
Changes since 1.41: +38 -9 lines
update flag-o-matic.eclass with has_{pic,pie,ssp}, hardened@gentoo.org

1 # Copyright 1999-2003 Gentoo Technologies, Inc.
2 # Distributed under the terms of the GNU General Public License v2
3 # $Header: /home/cvsroot/gentoo-x86/eclass/flag-o-matic.eclass,v 1.41 2004/03/16 21:37:09 solar Exp $
4 #
5 # Author Bart Verwilst <verwilst@gentoo.org>
6
7 ECLASS=flag-o-matic
8 INHERITED="$INHERITED $ECLASS"
9
10 #
11 #### filter-flags <flags> ####
12 # Remove particular flags from C[XX]FLAGS
13 # Matches only complete flags
14 #
15 #### append-flags <flags> ####
16 # Add extra flags to your current C[XX]FLAGS
17 #
18 #### replace-flags <orig.flag> <new.flag> ###
19 # Replace a flag by another one
20 #
21 #### replace-cpu-flags <new.cpu> <old.cpus> ###
22 # Replace march/mcpu flags that specify <old.cpus>
23 # with flags that specify <new.cpu>
24 #
25 #### is-flag <flag> ####
26 # Returns "true" if flag is set in C[XX]FLAGS
27 # Matches only complete a flag
28 #
29 #### strip-flags ####
30 # Strip C[XX]FLAGS of everything except known
31 # good options.
32 #
33 #### strip-unsupported-flags ####
34 # Strip C[XX]FLAGS of any flags not supported by
35 # installed version of gcc
36 #
37 #### get-flag <flag> ####
38 # Find and echo the value for a particular flag
39 #
40 #### replace-sparc64-flags ####
41 # Sets mcpu to v8 and uses the original value
42 # as mtune if none specified.
43 #
44 #### filter-mfpmath <math types> ####
45 # Remove specified math types from the fpmath specification
46 # If the user has -mfpmath=sse,386, running `filter-mfpmath sse`
47 # will leave the user with -mfpmath=386
48 #
49 #### append-ldflags ####
50 # Add extra flags to your current LDFLAGS
51 #
52 #### filter-ldflags <flags> ####
53 # Remove particular flags from LDFLAGS
54 # Matches only complete flags
55 #
56 #### etexec-flags ####
57 # hooked function for hardened-gcc that appends
58 # -yet_exec {C,CXX,LD}FLAGS when hardened-gcc is installed
59 # and a package is filtering -fPIC,-fpic, -fPIE, -fpie
60 #
61 #### fstack-flags ####
62 # hooked function for hardened-gcc that appends
63 # -yno_propolice to {C,CXX,LD}FLAGS when hardened-gcc is installed
64 # and a package is filtering -fstack-protector, -fstack-protector-all
65 #
66
67 # C[XX]FLAGS that we allow in strip-flags
68 setup-allowed-flags() {
69 export ALLOWED_FLAGS="-O -O1 -O2 -mcpu -march -mtune -fstack-protector -pipe -g"
70 case "${ARCH}" in
71 mips) ALLOWED_FLAGS="${ALLOWED_FLAGS} -mips1 -mips2 -mips3 -mips4 -mabi" ;;
72 amd64) ALLOWED_FLAGS="${ALLOWED_FLAGS} -fPIC" ;;
73 alpha) ALLOWED_FLAGS="${ALLOWED_FLAGS} -fPIC" ;;
74 ia64) ALLOWED_FLAGS="${ALLOWED_FLAGS} -fPIC" ;;
75 esac
76
77 # C[XX]FLAGS that we are think is ok, but needs testing
78 # NOTE: currently -Os have issues with gcc3 and K6* arch's
79 export UNSTABLE_FLAGS="-Os -O3 -freorder-blocks -fprefetch-loop-arrays"
80 return 0
81 }
82
83 filter-flags() {
84 for x in "$@" ; do
85 case "${x}" in
86 -fPIC|-fpic|-fPIE|-fpie|-pie) etexec-flags;;
87 -fstack-protector|-fstack-protector-all) fstack-flags;;
88 *) ;;
89 esac
90 done
91
92 # we do this fancy spacing stuff so as to not filter
93 # out part of a flag ... we want flag atoms ! :D
94 CFLAGS=" ${CFLAGS} "
95 CXXFLAGS=" ${CXXFLAGS} "
96 for x in "$@" ; do
97 CFLAGS="${CFLAGS// ${x} / }"
98 CXXFLAGS="${CXXFLAGS// ${x} / }"
99 done
100 CFLAGS="${CFLAGS:1:${#CFLAGS}-2}"
101 CXXFLAGS="${CXXFLAGS:1:${#CXXFLAGS}-2}"
102 return 0
103 }
104
105 filter-lfs-flags() {
106 filter-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
107 }
108
109 append-flags() {
110 export CFLAGS="${CFLAGS} $@"
111 export CXXFLAGS="${CXXFLAGS} $@"
112 [ "`is-flag -fno-stack-protector`" -o "`is-flag -fno-stack-protector-all`" ] && fstack-flags
113 return 0
114 }
115
116 replace-flags() {
117 # we do this fancy spacing stuff so as to not filter
118 # out part of a flag ... we want flag atoms ! :D
119 CFLAGS=" ${CFLAGS} "
120 CXXFLAGS=" ${CXXFLAGS} "
121 CFLAGS="${CFLAGS// ${1} / ${2} }"
122 CXXFLAGS="${CXXFLAGS// ${1} / ${2} }"
123 CFLAGS="${CFLAGS:1:${#CFLAGS}-2}"
124 CXXFLAGS="${CXXFLAGS:1:${#CXXFLAGS}-2}"
125 return 0
126 }
127
128 replace-cpu-flags() {
129 local newcpu="$1" ; shift
130 local oldcpu=""
131 for oldcpu in "$@" ; do
132 replace-flags -march=${oldcpu} -march=${newcpu}
133 replace-flags -mcpu=${oldcpu} -mcpu=${newcpu}
134 replace-flags -mtune=${oldcpu} -mtune=${newcpu}
135 done
136 return 0
137 }
138
139 is-flag() {
140 for x in ${CFLAGS} ${CXXFLAGS} ; do
141 if [ "${x}" == "$1" ] ; then
142 echo true
143 return 0
144 fi
145 done
146 return 1
147 }
148
149 filter-mfpmath() {
150 # save the original -mfpmath flag
151 local orig_mfpmath="`get-flag -mfpmath`"
152 # get the value of the current -mfpmath flag
153 local new_math=" `get-flag mfpmath | tr , ' '` "
154 # figure out which math values are to be removed
155 local prune_math=""
156 for prune_math in "$@" ; do
157 new_math="${new_math/ ${prune_math} / }"
158 done
159 new_math="`echo ${new_math:1:${#new_math}-2} | tr ' ' ,`"
160
161 if [ -z "${new_math}" ] ; then
162 # if we're removing all user specified math values are
163 # slated for removal, then we just filter the flag
164 filter-flags ${orig_mfpmath}
165 else
166 # if we only want to filter some of the user specified
167 # math values, then we replace the current flag
168 replace-flags ${orig_mfpmath} -mfpmath=${new_math}
169 fi
170 return 0
171 }
172
173 strip-flags() {
174 setup-allowed-flags
175
176 local NEW_CFLAGS=""
177 local NEW_CXXFLAGS=""
178
179 # Allow unstable C[XX]FLAGS if we are using unstable profile ...
180 if [ `has ~${ARCH} ${ACCEPT_KEYWORDS}` ] ; then
181 [ `use debug` ] && einfo "Enabling the use of some unstable flags"
182 ALLOWED_FLAGS="${ALLOWED_FLAGS} ${UNSTABLE_FLAGS}"
183 fi
184
185 set -f
186
187 for x in ${CFLAGS}
188 do
189 for y in ${ALLOWED_FLAGS}
190 do
191 flag=${x%%=*}
192 if [ "${flag%%${y}}" = "" ]
193 then
194 NEW_CFLAGS="${NEW_CFLAGS} ${x}"
195 break
196 fi
197 done
198 done
199
200 for x in ${CXXFLAGS}
201 do
202 for y in ${ALLOWED_FLAGS}
203 do
204 flag=${x%%=*}
205 if [ "${flag%%${y}}" = "" ]
206 then
207 NEW_CXXFLAGS="${NEW_CXXFLAGS} ${x}"
208 break
209 fi
210 done
211 done
212
213 # In case we filtered out all optimization flags fallback to -O2
214 if [ "${CFLAGS/-O}" != "${CFLAGS}" -a "${NEW_CFLAGS/-O}" = "${NEW_CFLAGS}" ]; then
215 NEW_CFLAGS="${NEW_CFLAGS} -O2"
216 fi
217 if [ "${CXXFLAGS/-O}" != "${CXXFLAGS}" -a "${NEW_CXXFLAGS/-O}" = "${NEW_CXXFLAGS}" ]; then
218 NEW_CXXFLAGS="${NEW_CXXFLAGS} -O2"
219 fi
220
221 set +f
222
223 [ `use debug` ] \
224 && einfo "CFLAGS=\"${NEW_CFLAGS}\"" \
225 && einfo "CXXFLAGS=\"${NEW_CXXFLAGS}\""
226
227 export CFLAGS="${NEW_CFLAGS}"
228 export CXXFLAGS="${NEW_CXXFLAGS}"
229 return 0
230 }
231
232 test_flag() {
233 if gcc -S -xc "$@" -o /dev/null /dev/null >/dev/null 2>&1; then
234 echo "$@"
235 return 0
236 fi
237 return 1
238 }
239
240 strip-unsupported-flags() {
241 for x in ${CFLAGS} ; do
242 NEW_CFLAGS=${NEW_CFLAGS}" ""`test_flag ${x}`"
243 done
244 for x in ${CXXFLAGS} ; do
245 NEW_CXXFLAGS=${NEW_CXXFLAGS}" ""`test_flag ${x}`"
246 done
247
248 export CFLAGS="${NEW_CFLAGS}"
249 export CXXFLAGS="${NEW_CXXFLAGS}"
250 }
251
252 get-flag() {
253 # this code looks a little flaky but seems to work for
254 # everything we want ...
255 # for example, if CFLAGS="-march=i686":
256 # `get-flags -march` == "-march=i686"
257 # `get-flags march` == "i686"
258 local findflag="$1"
259 for f in ${CFLAGS} ${CXXFLAGS} ; do
260 if [ "${f/${findflag}}" != "${f}" ] ; then
261 echo "${f/-${findflag}=}"
262 return 0
263 fi
264 done
265 return 1
266 }
267
268 has_pic() {
269 [ "${CFLAGS/-fPIC}" != "${CFLAGS}" ] && return 0
270 [ "${CFLAGS/-fpic}" != "${CFLAGS}" ] && return 0
271 [ has_version sys-devel/hardened-gcc ] && return 0
272 [ ! -z "`${CC/ .*/} --version| grep pie`" ] && return 0
273 return 1
274 }
275
276 has_pie() {
277 [ "${CFLAGS/-fPIC}" != "${CFLAGS}" ] && return 0
278 [ "${CFLAGS/-fpic}" != "${CFLAGS}" ] && return 0
279 [ has_version sys-devel/hardened-gcc ] && return 0
280 [ ! -z "`${CC/ .*/} --version| grep pie`" ] && return 0
281 return 1
282 }
283
284 has_ssp() {
285 [ "${CFLAGS/-fstack-protector}" != "${CFLAGS}" ] && return 0
286 [ has_version sys-devel/hardened-gcc ] && return 0
287 [ ! -z "`${CC/ .*/} --version| grep ssp`" ] && return 0
288 return 1
289 }
290
291 replace-sparc64-flags() {
292 local SPARC64_CPUS="ultrasparc v9"
293
294 if [ "${CFLAGS/mtune}" != "${CFLAGS}" ]
295 then
296 for x in ${SPARC64_CPUS}
297 do
298 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8}"
299 done
300 else
301 for x in ${SPARC64_CPUS}
302 do
303 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
304 done
305 fi
306
307 if [ "${CXXFLAGS/mtune}" != "${CXXFLAGS}" ]
308 then
309 for x in ${SPARC64_CPUS}
310 do
311 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8}"
312 done
313 else
314 for x in ${SPARC64_CPUS}
315 do
316 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
317 done
318 fi
319 }
320
321 append-ldflags() {
322 LDFLAGS="${LDFLAGS} $@"
323 return 0
324 }
325
326 filter-ldflags() {
327 # we do this fancy spacing stuff so as to not filter
328 # out part of a flag ... we want flag atoms ! :D
329 LDFLAGS=" ${LDFLAGS} "
330 for x in "$@" ; do
331 LDFLAGS="${LDFLAGS// ${x} / }"
332 done
333 LDFLAGS="${LDFLAGS:1:${#LDFLAGS}-2}"
334 return 0
335 }
336
337 etexec-flags() {
338 has_pie || has_pic
339 if [ $? == 0 ] ; then
340 # strip -fPIC regardless if you've gotten this far
341 strip-flags -fPIC -fpic -fPIE -fpie -pie
342 if [ "`is-flag -yet_exec`" != "true" ]; then
343 # If our compile support -yet_exec, append it now
344 [ -z "`gcc -yet_exec -S -o /dev/null -xc /dev/null 2>&1`" ] \
345 && ( debug-print ">>> appending flags -yet_exec" ; \
346 append-flags -yet_exec ; append-ldflags -yet_exec )
347 fi
348 fi
349 }
350
351 fstack-flags() {
352 has_ssp
353 if [ $? == 0 ] ; then
354 # strip -fstack-protector regardless if you've gotten this far
355 strip-flags -fstack-protector -fstack-protector-all
356 if [ "`is-flag -yno_propolice`" != "true" ]; then
357 # If our compile support -yno_propolice, append it now
358 [ -z "`gcc -yno_propolice -S -o /dev/null -xc /dev/null 2>&1`" ] \
359 && ( debug-print ">>> appending flags -yno_propolice" ; \
360 append-flags -yno_propolice ; append-ldflags -yno_propolice )
361 fi
362 fi
363 }

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