/[gentoo-x86]/eclass/flag-o-matic.eclass
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Revision 1.53 - (show annotations) (download)
Tue Jun 1 04:28:38 2004 UTC (10 years, 6 months ago) by solar
Branch: MAIN
Changes since 1.52: +11 -1 lines
prevent etexec-flags function from rewriting CFLAGS when not using the hardened compiler. bug #52286

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 1.52 2004/05/30 02:55:58 lv 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 # -fno-pic to {C,CXX,LD}FLAGS
59 # when a package is filtering -fpic, -fPIC, -fpie, -fPIE
60 #
61 #### fstack-flags ####
62 # hooked function for hardened gcc that appends
63 # -fno-stack-protector to {C,CXX,LD}FLAGS
64 # when a package is filtering -fstack-protector, -fstack-protector-all
65 # notice: modern automatic specs files will also suppress -fstack-protector-all
66 # when only -fno-stack-protector is given
67 #
68
69 # C[XX]FLAGS that we allow in strip-flags
70 setup-allowed-flags() {
71 if [ -z "${ALLOWED_FLAGS}" ] ; then
72 export ALLOWED_FLAGS="-O -O1 -O2 -mcpu -march -mtune -fstack-protector -fno-unit-at-a-time -pipe -g"
73 case "${ARCH}" in
74 mips) ALLOWED_FLAGS="${ALLOWED_FLAGS} -mips1 -mips2 -mips3 -mips4 -mabi" ;;
75 amd64) ALLOWED_FLAGS="${ALLOWED_FLAGS} -fPIC -m64" ;;
76 x86) ALLOWED_FLAGS="${ALLOWED_FLAGS} -m32" ;;
77 alpha) ALLOWED_FLAGS="${ALLOWED_FLAGS} -fPIC" ;;
78 ia64) ALLOWED_FLAGS="${ALLOWED_FLAGS} -fPIC" ;;
79 esac
80 fi
81
82 # C[XX]FLAGS that we are think is ok, but needs testing
83 # NOTE: currently -Os have issues with gcc3 and K6* arch's
84 export UNSTABLE_FLAGS="-Os -O3 -freorder-blocks -fprefetch-loop-arrays"
85 return 0
86 }
87
88 filter-flags() {
89 for x in "$@" ; do
90 case "${x}" in
91 -fPIC|-fpic|-fPIE|-fpie|-pie) etexec-flags;;
92 -fstack-protector|-fstack-protector-all) fstack-flags;;
93 *) ;;
94 esac
95 done
96
97 # we do this fancy spacing stuff so as to not filter
98 # out part of a flag ... we want flag atoms ! :D
99 CFLAGS=" ${CFLAGS} "
100 CXXFLAGS=" ${CXXFLAGS} "
101 for x in "$@" ; do
102 CFLAGS="${CFLAGS// ${x} / }"
103 CXXFLAGS="${CXXFLAGS// ${x} / }"
104 done
105 CFLAGS="${CFLAGS:1:${#CFLAGS}-2}"
106 CXXFLAGS="${CXXFLAGS:1:${#CXXFLAGS}-2}"
107 return 0
108 }
109
110 filter-lfs-flags() {
111 filter-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
112 }
113
114 append-lfs-flags() {
115 append-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
116 }
117
118 append-flags() {
119 export CFLAGS="${CFLAGS} $@"
120 export CXXFLAGS="${CXXFLAGS} $@"
121 [ "`is-flag -fno-stack-protector`" -o "`is-flag -fno-stack-protector-all`" ] && fstack-flags
122 return 0
123 }
124
125 replace-flags() {
126 # we do this fancy spacing stuff so as to not filter
127 # out part of a flag ... we want flag atoms ! :D
128 CFLAGS=" ${CFLAGS} "
129 CXXFLAGS=" ${CXXFLAGS} "
130 CFLAGS="${CFLAGS// ${1} / ${2} }"
131 CXXFLAGS="${CXXFLAGS// ${1} / ${2} }"
132 CFLAGS="${CFLAGS:1:${#CFLAGS}-2}"
133 CXXFLAGS="${CXXFLAGS:1:${#CXXFLAGS}-2}"
134 return 0
135 }
136
137 replace-cpu-flags() {
138 local newcpu="$1" ; shift
139 local oldcpu=""
140 for oldcpu in "$@" ; do
141 replace-flags -march=${oldcpu} -march=${newcpu}
142 replace-flags -mcpu=${oldcpu} -mcpu=${newcpu}
143 replace-flags -mtune=${oldcpu} -mtune=${newcpu}
144 done
145 return 0
146 }
147
148 is-flag() {
149 for x in ${CFLAGS} ${CXXFLAGS} ; do
150 if [ "${x}" == "$1" ] ; then
151 echo true
152 return 0
153 fi
154 done
155 return 1
156 }
157
158 filter-mfpmath() {
159 # save the original -mfpmath flag
160 local orig_mfpmath="`get-flag -mfpmath`"
161 # get the value of the current -mfpmath flag
162 local new_math=" `get-flag mfpmath | tr , ' '` "
163 # figure out which math values are to be removed
164 local prune_math=""
165 for prune_math in "$@" ; do
166 new_math="${new_math/ ${prune_math} / }"
167 done
168 new_math="`echo ${new_math:1:${#new_math}-2} | tr ' ' ,`"
169
170 if [ -z "${new_math}" ] ; then
171 # if we're removing all user specified math values are
172 # slated for removal, then we just filter the flag
173 filter-flags ${orig_mfpmath}
174 else
175 # if we only want to filter some of the user specified
176 # math values, then we replace the current flag
177 replace-flags ${orig_mfpmath} -mfpmath=${new_math}
178 fi
179 return 0
180 }
181
182 strip-flags() {
183 setup-allowed-flags
184
185 local NEW_CFLAGS=""
186 local NEW_CXXFLAGS=""
187
188 # Allow unstable C[XX]FLAGS if we are using unstable profile ...
189 if has ~${ARCH} ${ACCEPT_KEYWORDS} ; then
190 use debug && einfo "Enabling the use of some unstable flags"
191 ALLOWED_FLAGS="${ALLOWED_FLAGS} ${UNSTABLE_FLAGS}"
192 fi
193
194 set -f
195
196 for x in ${CFLAGS}
197 do
198 for y in ${ALLOWED_FLAGS}
199 do
200 flag=${x%%=*}
201 if [ "${flag%%${y}}" = "" ]
202 then
203 NEW_CFLAGS="${NEW_CFLAGS} ${x}"
204 break
205 fi
206 done
207 done
208
209 for x in ${CXXFLAGS}
210 do
211 for y in ${ALLOWED_FLAGS}
212 do
213 flag=${x%%=*}
214 if [ "${flag%%${y}}" = "" ]
215 then
216 NEW_CXXFLAGS="${NEW_CXXFLAGS} ${x}"
217 break
218 fi
219 done
220 done
221
222 # In case we filtered out all optimization flags fallback to -O2
223 if [ "${CFLAGS/-O}" != "${CFLAGS}" -a "${NEW_CFLAGS/-O}" = "${NEW_CFLAGS}" ]; then
224 NEW_CFLAGS="${NEW_CFLAGS} -O2"
225 fi
226 if [ "${CXXFLAGS/-O}" != "${CXXFLAGS}" -a "${NEW_CXXFLAGS/-O}" = "${NEW_CXXFLAGS}" ]; then
227 NEW_CXXFLAGS="${NEW_CXXFLAGS} -O2"
228 fi
229
230 set +f
231
232 use debug \
233 && einfo "CFLAGS=\"${NEW_CFLAGS}\"" \
234 && einfo "CXXFLAGS=\"${NEW_CXXFLAGS}\""
235
236 export CFLAGS="${NEW_CFLAGS}"
237 export CXXFLAGS="${NEW_CXXFLAGS}"
238 return 0
239 }
240
241 test_flag() {
242 if [ -z "`gcc -S -xc "$@" -o /dev/null /dev/null 2>&1`" ]; then
243 echo "$@"
244 return 0
245 fi
246 return 1
247 }
248
249 strip-unsupported-flags() {
250 for x in ${CFLAGS} ; do
251 NEW_CFLAGS=${NEW_CFLAGS}" ""`test_flag ${x}`"
252 done
253 for x in ${CXXFLAGS} ; do
254 NEW_CXXFLAGS=${NEW_CXXFLAGS}" ""`test_flag ${x}`"
255 done
256
257 export CFLAGS="${NEW_CFLAGS}"
258 export CXXFLAGS="${NEW_CXXFLAGS}"
259 }
260
261 get-flag() {
262 # this code looks a little flaky but seems to work for
263 # everything we want ...
264 # for example, if CFLAGS="-march=i686":
265 # `get-flags -march` == "-march=i686"
266 # `get-flags march` == "i686"
267 local findflag="$1"
268 for f in ${CFLAGS} ${CXXFLAGS} ; do
269 if [ "${f/${findflag}}" != "${f}" ] ; then
270 echo "${f/-${findflag}=}"
271 return 0
272 fi
273 done
274 return 1
275 }
276
277 has_hardened() {
278 local cc=${CC:-gcc}
279 [[ $(${cc%% *} --version 2>&1) == *Hardened* ]]
280 return $?
281 }
282
283 has_pic() {
284 [ "${CFLAGS/-fPIC}" != "${CFLAGS}" ] && return 0
285 [ "${CFLAGS/-fpic}" != "${CFLAGS}" ] && return 0
286 [ ! -z "`${CC/ .*/} --version| grep pie`" ] && return 0
287 return 1
288 }
289
290 has_pie() {
291 [ "${CFLAGS/-fPIE}" != "${CFLAGS}" ] && return 0
292 [ "${CFLAGS/-fpie}" != "${CFLAGS}" ] && return 0
293 [ ! -z "`${CC/ .*/} --version| grep pie`" ] && return 0
294 return 1
295 }
296
297 has_ssp() {
298 [ "${CFLAGS/-fstack-protector}" != "${CFLAGS}" ] && return 0
299 [ ! -z "`${CC/ .*/} --version| grep ssp`" ] && return 0
300 return 1
301 }
302
303 replace-sparc64-flags() {
304 local SPARC64_CPUS="ultrasparc v9"
305
306 if [ "${CFLAGS/mtune}" != "${CFLAGS}" ]
307 then
308 for x in ${SPARC64_CPUS}
309 do
310 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8}"
311 done
312 else
313 for x in ${SPARC64_CPUS}
314 do
315 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
316 done
317 fi
318
319 if [ "${CXXFLAGS/mtune}" != "${CXXFLAGS}" ]
320 then
321 for x in ${SPARC64_CPUS}
322 do
323 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8}"
324 done
325 else
326 for x in ${SPARC64_CPUS}
327 do
328 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
329 done
330 fi
331 }
332
333 append-ldflags() {
334 LDFLAGS="${LDFLAGS} $@"
335 return 0
336 }
337
338 filter-ldflags() {
339 # we do this fancy spacing stuff so as to not filter
340 # out part of a flag ... we want flag atoms ! :D
341 LDFLAGS=" ${LDFLAGS} "
342 for x in "$@" ; do
343 LDFLAGS="${LDFLAGS// ${x} / }"
344 done
345 LDFLAGS="${LDFLAGS:1:${#LDFLAGS}-2}"
346 return 0
347 }
348
349 etexec-flags() {
350 # if your not using a hardened compiler you wont need this
351 # PIC/no-pic kludge in the first place.
352 has_hardened || return
353
354 has_pie || has_pic
355 if [ $? == 0 ] ; then
356 [ -z "`is-flag -fno-pic`" ] &&
357 export CFLAGS="${CFLAGS} `test_flag -fno-pic`"
358
359 [ -z "`is-flag -nopie`" ] &&
360 export CFLAGS="${CFLAGS} `test_flag -nopie`"
361 fi
362 }
363
364 fstack-flags() {
365 has_ssp
366 if [ $? == 0 ] ; then
367 [ -z "`is-flag -fno-stack-protector`" ] &&
368 export CFLAGS="${CFLAGS} `test_flag -fno-stack-protector`"
369 fi
370 }

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