/[gentoo-x86]/eclass/flag-o-matic.eclass
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Revision 1.50 - (show annotations) (download)
Wed May 12 13:36:17 2004 UTC (10 years, 2 months ago) by pappy
Branch: MAIN
Changes since 1.49: +16 -16 lines
added new switches for enabling and suppressing hardened PIE/SSP building

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 1.49 2004/05/11 13:02:05 vapier 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 -pipe -g"
73 case "${ARCH}" in
74 mips) ALLOWED_FLAGS="${ALLOWED_FLAGS} -mips1 -mips2 -mips3 -mips4 -mabi" ;;
75 amd64) ALLOWED_FLAGS="${ALLOWED_FLAGS} -fPIC" ;;
76 alpha) ALLOWED_FLAGS="${ALLOWED_FLAGS} -fPIC" ;;
77 ia64) ALLOWED_FLAGS="${ALLOWED_FLAGS} -fPIC" ;;
78 esac
79 fi
80
81 # C[XX]FLAGS that we are think is ok, but needs testing
82 # NOTE: currently -Os have issues with gcc3 and K6* arch's
83 export UNSTABLE_FLAGS="-Os -O3 -freorder-blocks -fprefetch-loop-arrays"
84 return 0
85 }
86
87 filter-flags() {
88 for x in "$@" ; do
89 case "${x}" in
90 -fPIC|-fpic|-fPIE|-fpie|-pie) etexec-flags;;
91 -fstack-protector|-fstack-protector-all) fstack-flags;;
92 *) ;;
93 esac
94 done
95
96 # we do this fancy spacing stuff so as to not filter
97 # out part of a flag ... we want flag atoms ! :D
98 CFLAGS=" ${CFLAGS} "
99 CXXFLAGS=" ${CXXFLAGS} "
100 for x in "$@" ; do
101 CFLAGS="${CFLAGS// ${x} / }"
102 CXXFLAGS="${CXXFLAGS// ${x} / }"
103 done
104 CFLAGS="${CFLAGS:1:${#CFLAGS}-2}"
105 CXXFLAGS="${CXXFLAGS:1:${#CXXFLAGS}-2}"
106 return 0
107 }
108
109 filter-lfs-flags() {
110 filter-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
111 }
112
113 append-lfs-flags() {
114 append-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
115 }
116
117 append-flags() {
118 export CFLAGS="${CFLAGS} $@"
119 export CXXFLAGS="${CXXFLAGS} $@"
120 [ "`is-flag -fno-stack-protector`" -o "`is-flag -fno-stack-protector-all`" ] && fstack-flags
121 return 0
122 }
123
124 replace-flags() {
125 # we do this fancy spacing stuff so as to not filter
126 # out part of a flag ... we want flag atoms ! :D
127 CFLAGS=" ${CFLAGS} "
128 CXXFLAGS=" ${CXXFLAGS} "
129 CFLAGS="${CFLAGS// ${1} / ${2} }"
130 CXXFLAGS="${CXXFLAGS// ${1} / ${2} }"
131 CFLAGS="${CFLAGS:1:${#CFLAGS}-2}"
132 CXXFLAGS="${CXXFLAGS:1:${#CXXFLAGS}-2}"
133 return 0
134 }
135
136 replace-cpu-flags() {
137 local newcpu="$1" ; shift
138 local oldcpu=""
139 for oldcpu in "$@" ; do
140 replace-flags -march=${oldcpu} -march=${newcpu}
141 replace-flags -mcpu=${oldcpu} -mcpu=${newcpu}
142 replace-flags -mtune=${oldcpu} -mtune=${newcpu}
143 done
144 return 0
145 }
146
147 is-flag() {
148 for x in ${CFLAGS} ${CXXFLAGS} ; do
149 if [ "${x}" == "$1" ] ; then
150 echo true
151 return 0
152 fi
153 done
154 return 1
155 }
156
157 filter-mfpmath() {
158 # save the original -mfpmath flag
159 local orig_mfpmath="`get-flag -mfpmath`"
160 # get the value of the current -mfpmath flag
161 local new_math=" `get-flag mfpmath | tr , ' '` "
162 # figure out which math values are to be removed
163 local prune_math=""
164 for prune_math in "$@" ; do
165 new_math="${new_math/ ${prune_math} / }"
166 done
167 new_math="`echo ${new_math:1:${#new_math}-2} | tr ' ' ,`"
168
169 if [ -z "${new_math}" ] ; then
170 # if we're removing all user specified math values are
171 # slated for removal, then we just filter the flag
172 filter-flags ${orig_mfpmath}
173 else
174 # if we only want to filter some of the user specified
175 # math values, then we replace the current flag
176 replace-flags ${orig_mfpmath} -mfpmath=${new_math}
177 fi
178 return 0
179 }
180
181 strip-flags() {
182 setup-allowed-flags
183
184 local NEW_CFLAGS=""
185 local NEW_CXXFLAGS=""
186
187 # Allow unstable C[XX]FLAGS if we are using unstable profile ...
188 if has ~${ARCH} ${ACCEPT_KEYWORDS} ; then
189 use debug && einfo "Enabling the use of some unstable flags"
190 ALLOWED_FLAGS="${ALLOWED_FLAGS} ${UNSTABLE_FLAGS}"
191 fi
192
193 set -f
194
195 for x in ${CFLAGS}
196 do
197 for y in ${ALLOWED_FLAGS}
198 do
199 flag=${x%%=*}
200 if [ "${flag%%${y}}" = "" ]
201 then
202 NEW_CFLAGS="${NEW_CFLAGS} ${x}"
203 break
204 fi
205 done
206 done
207
208 for x in ${CXXFLAGS}
209 do
210 for y in ${ALLOWED_FLAGS}
211 do
212 flag=${x%%=*}
213 if [ "${flag%%${y}}" = "" ]
214 then
215 NEW_CXXFLAGS="${NEW_CXXFLAGS} ${x}"
216 break
217 fi
218 done
219 done
220
221 # In case we filtered out all optimization flags fallback to -O2
222 if [ "${CFLAGS/-O}" != "${CFLAGS}" -a "${NEW_CFLAGS/-O}" = "${NEW_CFLAGS}" ]; then
223 NEW_CFLAGS="${NEW_CFLAGS} -O2"
224 fi
225 if [ "${CXXFLAGS/-O}" != "${CXXFLAGS}" -a "${NEW_CXXFLAGS/-O}" = "${NEW_CXXFLAGS}" ]; then
226 NEW_CXXFLAGS="${NEW_CXXFLAGS} -O2"
227 fi
228
229 set +f
230
231 use debug \
232 && einfo "CFLAGS=\"${NEW_CFLAGS}\"" \
233 && einfo "CXXFLAGS=\"${NEW_CXXFLAGS}\""
234
235 export CFLAGS="${NEW_CFLAGS}"
236 export CXXFLAGS="${NEW_CXXFLAGS}"
237 return 0
238 }
239
240 test_flag() {
241 if [ -z "`gcc -S -xc "$@" -o /dev/null /dev/null 2>&1`" ]; then
242 echo "$@"
243 return 0
244 fi
245 return 1
246 }
247
248 strip-unsupported-flags() {
249 for x in ${CFLAGS} ; do
250 NEW_CFLAGS=${NEW_CFLAGS}" ""`test_flag ${x}`"
251 done
252 for x in ${CXXFLAGS} ; do
253 NEW_CXXFLAGS=${NEW_CXXFLAGS}" ""`test_flag ${x}`"
254 done
255
256 export CFLAGS="${NEW_CFLAGS}"
257 export CXXFLAGS="${NEW_CXXFLAGS}"
258 }
259
260 get-flag() {
261 # this code looks a little flaky but seems to work for
262 # everything we want ...
263 # for example, if CFLAGS="-march=i686":
264 # `get-flags -march` == "-march=i686"
265 # `get-flags march` == "i686"
266 local findflag="$1"
267 for f in ${CFLAGS} ${CXXFLAGS} ; do
268 if [ "${f/${findflag}}" != "${f}" ] ; then
269 echo "${f/-${findflag}=}"
270 return 0
271 fi
272 done
273 return 1
274 }
275
276 has_pic() {
277 [ "${CFLAGS/-fPIC}" != "${CFLAGS}" ] && return 0
278 [ "${CFLAGS/-fpic}" != "${CFLAGS}" ] && return 0
279 [ ! -z "`${CC/ .*/} --version| grep pie`" ] && return 0
280 return 1
281 }
282
283 has_pie() {
284 [ "${CFLAGS/-fPIE}" != "${CFLAGS}" ] && return 0
285 [ "${CFLAGS/-fpie}" != "${CFLAGS}" ] && return 0
286 [ ! -z "`${CC/ .*/} --version| grep pie`" ] && return 0
287 return 1
288 }
289
290 has_ssp() {
291 [ "${CFLAGS/-fstack-protector}" != "${CFLAGS}" ] && return 0
292 [ ! -z "`${CC/ .*/} --version| grep ssp`" ] && return 0
293 return 1
294 }
295
296 replace-sparc64-flags() {
297 local SPARC64_CPUS="ultrasparc v9"
298
299 if [ "${CFLAGS/mtune}" != "${CFLAGS}" ]
300 then
301 for x in ${SPARC64_CPUS}
302 do
303 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8}"
304 done
305 else
306 for x in ${SPARC64_CPUS}
307 do
308 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
309 done
310 fi
311
312 if [ "${CXXFLAGS/mtune}" != "${CXXFLAGS}" ]
313 then
314 for x in ${SPARC64_CPUS}
315 do
316 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8}"
317 done
318 else
319 for x in ${SPARC64_CPUS}
320 do
321 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
322 done
323 fi
324 }
325
326 append-ldflags() {
327 LDFLAGS="${LDFLAGS} $@"
328 return 0
329 }
330
331 filter-ldflags() {
332 # we do this fancy spacing stuff so as to not filter
333 # out part of a flag ... we want flag atoms ! :D
334 LDFLAGS=" ${LDFLAGS} "
335 for x in "$@" ; do
336 LDFLAGS="${LDFLAGS// ${x} / }"
337 done
338 LDFLAGS="${LDFLAGS:1:${#LDFLAGS}-2}"
339 return 0
340 }
341
342 etexec-flags() {
343 has_pie || has_pic
344 if [ $? == 0 ] ; then
345 [ -z "`is-flag -fno-pic`" ] &&
346 export CFLAGS="${CFLAGS} `test_flag -fno-pic`"
347
348 [ -z "`is-flag -nopie`" ] &&
349 export CFLAGS="${CFLAGS} `test_flag -nopie`"
350 fi
351 }
352
353 fstack-flags() {
354 has_ssp
355 if [ $? == 0 ] ; then
356 [ -z "`is-flag -fno-stack-protector`" ] &&
357 export CFLAGS="${CFLAGS} `test_flag -fno-stack-protector`"
358 fi
359 }

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