/[gentoo-x86]/eclass/flag-o-matic.eclass
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Revision 1.40 - (show annotations) (download)
Fri Mar 12 11:21:15 2004 UTC (10 years, 6 months ago) by vapier
Branch: MAIN
Changes since 1.39: +5 -1 lines
add filter-lfs-flags

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 1.39 2004/03/12 05:14:45 solar Exp $
4 #
5 # Author Bart Verwilst <verwilst@gentoo.org>
6
7 ECLASS=flag-o-matic
8 INHERITED="$INHERITED $ECLASS"
9
10 #
11 #### filter-flags <flags> ####
12 # Remove particular flags from C[XX]FLAGS
13 # Matches only complete flags
14 #
15 #### append-flags <flags> ####
16 # Add extra flags to your current C[XX]FLAGS
17 #
18 #### replace-flags <orig.flag> <new.flag> ###
19 # Replace a flag by another one
20 #
21 #### replace-cpu-flags <new.cpu> <old.cpus> ###
22 # Replace march/mcpu flags that specify <old.cpus>
23 # with flags that specify <new.cpu>
24 #
25 #### is-flag <flag> ####
26 # Returns "true" if flag is set in C[XX]FLAGS
27 # Matches only complete a flag
28 #
29 #### strip-flags ####
30 # Strip C[XX]FLAGS of everything except known
31 # good options.
32 #
33 #### strip-unsupported-flags ####
34 # Strip C[XX]FLAGS of any flags not supported by
35 # installed version of gcc
36 #
37 #### get-flag <flag> ####
38 # Find and echo the value for a particular flag
39 #
40 #### replace-sparc64-flags ####
41 # Sets mcpu to v8 and uses the original value
42 # as mtune if none specified.
43 #
44 #### filter-mfpmath <math types> ####
45 # Remove specified math types from the fpmath specification
46 # If the user has -mfpmath=sse,386, running `filter-mfpmath sse`
47 # will leave the user with -mfpmath=386
48 #
49 #### append-ldflags ####
50 # Add extra flags to your current LDFLAGS
51 #
52 #### etexec-flags ####
53 # hooked function for hardened-gcc that appends
54 # -yet_exec {C,CXX,LD}FLAGS when hardened-gcc is installed
55 # and a package is filtering -fPIC,-fpic, -fPIE, -fpie
56 #
57 #### fstack-flags ####
58 # hooked function for hardened-gcc that appends
59 # -yno_propolice to {C,CXX,LD}FLAGS when hardened-gcc is installed
60 # and a package is filtering -fstack-protector, -fstack-protector-all
61 #
62
63 # C[XX]FLAGS that we allow in strip-flags
64 setup-allowed-flags() {
65 export ALLOWED_FLAGS="-O -O1 -O2 -mcpu -march -mtune -fstack-protector -pipe -g"
66 case "${ARCH}" in
67 mips) ALLOWED_FLAGS="${ALLOWED_FLAGS} -mips1 -mips2 -mips3 -mips4 -mabi" ;;
68 amd64) ALLOWED_FLAGS="${ALLOWED_FLAGS} -fPIC" ;;
69 alpha) ALLOWED_FLAGS="${ALLOWED_FLAGS} -fPIC" ;;
70 ia64) ALLOWED_FLAGS="${ALLOWED_FLAGS} -fPIC" ;;
71 esac
72
73 # C[XX]FLAGS that we are think is ok, but needs testing
74 # NOTE: currently -Os have issues with gcc3 and K6* arch's
75 export UNSTABLE_FLAGS="-Os -O3 -freorder-blocks -fprefetch-loop-arrays"
76 return 0
77 }
78
79 filter-flags() {
80 for x in "$@" ; do
81 case "${x}" in
82 -fPIC|-fpic|-fPIE|-fpie|-pie) etexec-flags;;
83 -fstack-protector|-fstack-protector-all) fstack-flags;;
84 *) ;;
85 esac
86 done
87
88 # we do this fancy spacing stuff so as to not filter
89 # out part of a flag ... we want flag atoms ! :D
90 CFLAGS=" ${CFLAGS} "
91 CXXFLAGS=" ${CXXFLAGS} "
92 for x in "$@" ; do
93 CFLAGS="${CFLAGS// ${x} / }"
94 CXXFLAGS="${CXXFLAGS// ${x} / }"
95 done
96 CFLAGS="${CFLAGS:1:${#CFLAGS}-2}"
97 CXXFLAGS="${CXXFLAGS:1:${#CXXFLAGS}-2}"
98 return 0
99 }
100
101 filter-lfs-flags() {
102 filter-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
103 }
104
105 append-flags() {
106 export CFLAGS="${CFLAGS} $@"
107 export CXXFLAGS="${CXXFLAGS} $@"
108 [ "`is-flag -fno-stack-protector`" -o "`is-flag -fno-stack-protector-all`" ] && fstack-flags
109 return 0
110 }
111
112 replace-flags() {
113 # we do this fancy spacing stuff so as to not filter
114 # out part of a flag ... we want flag atoms ! :D
115 CFLAGS=" ${CFLAGS} "
116 CXXFLAGS=" ${CXXFLAGS} "
117 CFLAGS="${CFLAGS// ${1} / ${2} }"
118 CXXFLAGS="${CXXFLAGS// ${1} / ${2} }"
119 CFLAGS="${CFLAGS:1:${#CFLAGS}-2}"
120 CXXFLAGS="${CXXFLAGS:1:${#CXXFLAGS}-2}"
121 return 0
122 }
123
124 replace-cpu-flags() {
125 local newcpu="$1" ; shift
126 local oldcpu=""
127 for oldcpu in "$@" ; do
128 replace-flags -march=${oldcpu} -march=${newcpu}
129 replace-flags -mcpu=${oldcpu} -mcpu=${newcpu}
130 replace-flags -mtune=${oldcpu} -mtune=${newcpu}
131 done
132 return 0
133 }
134
135 is-flag() {
136 for x in ${CFLAGS} ${CXXFLAGS} ; do
137 if [ "${x}" == "$1" ] ; then
138 echo true
139 return 0
140 fi
141 done
142 return 1
143 }
144
145 filter-mfpmath() {
146 # save the original -mfpmath flag
147 local orig_mfpmath="`get-flag -mfpmath`"
148 # get the value of the current -mfpmath flag
149 local new_math=" `get-flag mfpmath | tr , ' '` "
150 # figure out which math values are to be removed
151 local prune_math=""
152 for prune_math in "$@" ; do
153 new_math="${new_math/ ${prune_math} / }"
154 done
155 new_math="`echo ${new_math:1:${#new_math}-2} | tr ' ' ,`"
156
157 if [ -z "${new_math}" ] ; then
158 # if we're removing all user specified math values are
159 # slated for removal, then we just filter the flag
160 filter-flags ${orig_mfpmath}
161 else
162 # if we only want to filter some of the user specified
163 # math values, then we replace the current flag
164 replace-flags ${orig_mfpmath} -mfpmath=${new_math}
165 fi
166 return 0
167 }
168
169 strip-flags() {
170 setup-allowed-flags
171
172 local NEW_CFLAGS=""
173 local NEW_CXXFLAGS=""
174
175 # Allow unstable C[XX]FLAGS if we are using unstable profile ...
176 if [ `has ~${ARCH} ${ACCEPT_KEYWORDS}` ] ; then
177 [ `use debug` ] && einfo "Enabling the use of some unstable flags"
178 ALLOWED_FLAGS="${ALLOWED_FLAGS} ${UNSTABLE_FLAGS}"
179 fi
180
181 set -f
182
183 for x in ${CFLAGS}
184 do
185 for y in ${ALLOWED_FLAGS}
186 do
187 flag=${x%%=*}
188 if [ "${flag%%${y}}" = "" ]
189 then
190 NEW_CFLAGS="${NEW_CFLAGS} ${x}"
191 break
192 fi
193 done
194 done
195
196 for x in ${CXXFLAGS}
197 do
198 for y in ${ALLOWED_FLAGS}
199 do
200 flag=${x%%=*}
201 if [ "${flag%%${y}}" = "" ]
202 then
203 NEW_CXXFLAGS="${NEW_CXXFLAGS} ${x}"
204 break
205 fi
206 done
207 done
208
209 # In case we filtered out all optimization flags fallback to -O2
210 if [ "${CFLAGS/-O}" != "${CFLAGS}" -a "${NEW_CFLAGS/-O}" = "${NEW_CFLAGS}" ]; then
211 NEW_CFLAGS="${NEW_CFLAGS} -O2"
212 fi
213 if [ "${CXXFLAGS/-O}" != "${CXXFLAGS}" -a "${NEW_CXXFLAGS/-O}" = "${NEW_CXXFLAGS}" ]; then
214 NEW_CXXFLAGS="${NEW_CXXFLAGS} -O2"
215 fi
216
217 set +f
218
219 [ `use debug` ] \
220 && einfo "CFLAGS=\"${NEW_CFLAGS}\"" \
221 && einfo "CXXFLAGS=\"${NEW_CXXFLAGS}\""
222
223 export CFLAGS="${NEW_CFLAGS}"
224 export CXXFLAGS="${NEW_CXXFLAGS}"
225 return 0
226 }
227
228 test_flag() {
229 if gcc -S -xc "$@" -o /dev/null /dev/null >/dev/null 2>&1; then
230 echo "$@"
231 return 0
232 fi
233 return 1
234 }
235
236 strip-unsupported-flags() {
237 for x in ${CFLAGS} ; do
238 NEW_CFLAGS=${NEW_CFLAGS}" ""`test_flag ${x}`"
239 done
240 for x in ${CXXFLAGS} ; do
241 NEW_CXXFLAGS=${NEW_CXXFLAGS}" ""`test_flag ${x}`"
242 done
243
244 export CFLAGS="${NEW_CFLAGS}"
245 export CXXFLAGS="${NEW_CXXFLAGS}"
246 }
247
248 get-flag() {
249 # this code looks a little flaky but seems to work for
250 # everything we want ...
251 # for example, if CFLAGS="-march=i686":
252 # `get-flags -march` == "-march=i686"
253 # `get-flags march` == "i686"
254 local findflag="$1"
255 for f in ${CFLAGS} ${CXXFLAGS} ; do
256 if [ "${f/${findflag}}" != "${f}" ] ; then
257 echo "${f/-${findflag}=}"
258 return 0
259 fi
260 done
261 return 1
262 }
263
264 replace-sparc64-flags() {
265 local SPARC64_CPUS="ultrasparc v9"
266
267 if [ "${CFLAGS/mtune}" != "${CFLAGS}" ]
268 then
269 for x in ${SPARC64_CPUS}
270 do
271 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8}"
272 done
273 else
274 for x in ${SPARC64_CPUS}
275 do
276 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
277 done
278 fi
279
280 if [ "${CXXFLAGS/mtune}" != "${CXXFLAGS}" ]
281 then
282 for x in ${SPARC64_CPUS}
283 do
284 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8}"
285 done
286 else
287 for x in ${SPARC64_CPUS}
288 do
289 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
290 done
291 fi
292 }
293
294 append-ldflags() {
295 LDFLAGS="${LDFLAGS} $@"
296 return 0
297 }
298
299 etexec-flags() {
300 has_version sys-devel/hardened-gcc
301 if [ $? == 0 ] ; then
302 if [ "`is-flag -yet_exec`" != "true" ]; then
303 debug-print ">>> appending flags -yet_exec"
304 append-flags -yet_exec
305 append-ldflags -yet_exec
306 fi
307 fi
308 }
309
310 fstack-flags() {
311 has_version sys-devel/hardened-gcc
312 if [ $? == 0 ] ; then
313 if [ "`is-flag -yno_propolice`" != "true" ]; then
314 debug-print ">>> appending flags -yno_propolice"
315 append-flags -yno_propolice
316 append-ldflags -yno_propolice
317 fi
318 fi
319 }

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