/[gentoo-x86]/eclass/flag-o-matic.eclass
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Revision 1.30 - (show annotations) (download)
Fri Nov 7 18:42:45 2003 UTC (10 years, 8 months ago) by azarah
Branch: MAIN
Changes since 1.29: +9 -1 lines
Close bug #32882

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 1.29 2003/10/31 23:03:40 puggy Exp $
4 #
5 # Author Bart Verwilst <verwilst@gentoo.org>
6
7 ECLASS=flag-o-matic
8 INHERITED="$INHERITED $ECLASS"
9
10 #
11 #### filter-flags <flags> ####
12 # Remove particular flags from C[XX]FLAGS
13 # Matches only complete flags
14 #
15 #### append-flags <flags> ####
16 # Add extra flags to your current C[XX]FLAGS
17 #
18 #### replace-flags <orig.flag> <new.flag> ###
19 # Replace a flag by another one
20 #
21 #### is-flag <flag> ####
22 # Returns "true" if flag is set in C[XX]FLAGS
23 # Matches only complete a flag
24 #
25 #### strip-flags ####
26 # Strip C[XX]FLAGS of everything except known
27 # good options.
28 #
29 #### strip-unsupported-flags ####
30 # Strip C[XX]FLAGS of any flags not supported by
31 # installed version of gcc
32 #
33 #### get-flag <flag> ####
34 # Find and echo the value for a particular flag
35 #
36 #### replace-sparc64-flags ####
37 # Sets mcpu to v8 and uses the original value
38 # as mtune if none specified.
39 #
40 #### filter-mfpmath <math types> ####
41 # Remove specified math types from the fpmath specification
42 # If the user has -mfpmath=sse,386, running `filter-mfpmath sse`
43 # will leave the user with -mfpmath=386
44 #
45 #### append-ldflags ####
46 # Add extra flags to your current LDFLAGS
47 #
48 #### etexec-flags ####
49 # hooked function for hardened-gcc that appends
50 # -yet_exec {C,CXX,LD}FLAGS when hardened-gcc is installed
51 # and a package is filtering -fPIC
52 #
53 #### fstack-flags ####
54 # hooked function for hardened-gcc that appends
55 # -yno_propolice to {C,CXX,LD}FLAGS when hardened-gcc is installed
56 # and a package is filtering -fstack-protector
57 #
58
59 # C[XX]FLAGS that we allow in strip-flags
60 ALLOWED_FLAGS="-O -O1 -O2 -mcpu -march -mtune -fstack-protector -pipe -g"
61 case "${ARCH}" in
62 mips) ALLOWED_FLAGS="${ALLOWED_FLAGS} -mips1 -mips2 -mips3 -mips4 -mabi" ;;
63 amd64) ALLOWED_FLAGS="${ALLOWED_FLAGS} -fPIC" ;;
64 alpha) ALLOWED_FLAGS="${ALLOWED_FLAGS} -fPIC" ;;
65 esac
66
67 # C[XX]FLAGS that we are think is ok, but needs testing
68 # NOTE: currently -Os have issues with gcc3 and K6* arch's
69 UNSTABLE_FLAGS="-Os -O3 -freorder-blocks -fprefetch-loop-arrays"
70
71 filter-mfpmath() {
72 for a in $CFLAGS; do
73 if [ "${a:0:8}" == "-mfpmath" ]; then
74 orig_mfpmath=$a
75 fi
76 done
77
78 mfpmath="$( echo $orig_mfpmath | awk -F '=' '{print $2}' | tr "," " " )"
79 for b in $@; do
80 mfpmath="${mfpmath/$b}"
81 done
82
83 if [ -z "${mfpmath/ }" ]; then
84 filter-flags "$orig_mfpmath"
85 else
86 new_mfpmath="-mfpmath=$( echo $mfpmath | sed -e "s/ /,/g" -e "s/,,/,/g" )"
87 replace-flags "$orig_mfpmath" "$new_mfpmath"
88 fi
89 }
90
91 filter-flags() {
92 # we do two loops to avoid the first and last char from being chomped.
93 for x in $@ ; do
94 case "${x}" in
95 -fPIC) etexec-flags;;
96 -fstack-protector) fstack-flags;;
97 *) ;;
98 esac
99 done
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:${#CXXFLAGS}-2}"
110 }
111
112 append-flags() {
113 CFLAGS="${CFLAGS} $@"
114 CXXFLAGS="${CXXFLAGS} $@"
115 for x in $@; do
116 [ "${x}" = "-fno-stack-protector" ] && fstack-flags
117 done
118 return 0
119 }
120
121 replace-flags() {
122 CFLAGS="${CFLAGS/${1}/${2} }"
123 CXXFLAGS="${CXXFLAGS/${1}/${2} }"
124 return 0
125 }
126
127 is-flag() {
128 for x in ${CFLAGS} ${CXXFLAGS} ; do
129 if [ "${x}" == "$1" ] ; then
130 echo true
131 return 0
132 fi
133 done
134 return 1
135 }
136
137 strip-flags() {
138 local NEW_CFLAGS=""
139 local NEW_CXXFLAGS=""
140
141 # Allow unstable C[XX]FLAGS if we are using unstable profile ...
142 if [ `has ~${ARCH} ${ACCEPT_KEYWORDS}` ] ; then
143 [ `use debug` ] && einfo "Enabling the use of some unstable flags"
144 ALLOWED_FLAGS="${ALLOWED_FLAGS} ${UNSTABLE_FLAGS}"
145 fi
146
147 set -f
148
149 for x in ${CFLAGS}
150 do
151 for y in ${ALLOWED_FLAGS}
152 do
153 flag=${x%%=*}
154 if [ "${flag%%${y}}" = "" ]
155 then
156 NEW_CFLAGS="${NEW_CFLAGS} ${x}"
157 break
158 fi
159 done
160 done
161
162 for x in ${CXXFLAGS}
163 do
164 for y in ${ALLOWED_FLAGS}
165 do
166 flag=${x%%=*}
167 if [ "${flag%%${y}}" = "" ]
168 then
169 NEW_CXXFLAGS="${NEW_CXXFLAGS} ${x}"
170 break
171 fi
172 done
173 done
174
175 # In case we filtered out all optimization flags fallback to -O2
176 if [ "${CFLAGS/-O}" != "${CFLAGS}" -a "${NEW_CFLAGS/-O}" = "${NEW_CFLAGS}" ]; then
177 NEW_CFLAGS="${NEW_CFLAGS} -O2"
178 fi
179 if [ "${CXXFLAGS/-O}" != "${CXXFLAGS}" -a "${NEW_CXXFLAGS/-O}" = "${NEW_CXXFLAGS}" ]; then
180 NEW_CXXFLAGS="${NEW_CXXFLAGS} -O2"
181 fi
182
183 set +f
184
185 [ `use debug` ] \
186 && einfo "CFLAGS=\"${NEW_CFLAGS}\"" \
187 && einfo "CXXFLAGS=\"${NEW_CXXFLAGS}\""
188
189 export CFLAGS="${NEW_CFLAGS}"
190 export CXXFLAGS="${NEW_CXXFLAGS}"
191 }
192
193 test_flag () {
194 if gcc -S -xc $1 -o /dev/null /dev/null >/dev/null 2>&1; then
195 echo "$1"
196 fi
197 }
198
199 strip-unsupported-flags() {
200 for x in ${CFLAGS}
201 do
202 NEW_CFLAGS=${NEW_CFLAGS}" ""`test_flag ${x}`"
203 done
204
205 for x in ${CXXFLAGS}
206 do
207 NEW_CXXFLAGS=${NEW_CXXFLAGS}" ""`test_flag ${x}`"
208 done
209
210 CFLAGS="${NEW_CFLAGS}"
211 CXXFLAGS="${NEW_CXXFLAGS}"
212 }
213
214 get-flag() {
215 local findflag="$1"
216 for f in ${CFLAGS} ${CXXFLAGS} ; do
217 if [ "${f/${findflag}}" != "${f}" ] ; then
218 echo "${f/-${findflag}=}"
219 return 0
220 fi
221 done
222 return 1
223 }
224
225 replace-sparc64-flags() {
226 local SPARC64_CPUS="ultrasparc v9"
227
228 if [ "${CFLAGS/mtune}" != "${CFLAGS}" ]
229 then
230 for x in ${SPARC64_CPUS}
231 do
232 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8}"
233 done
234 else
235 for x in ${SPARC64_CPUS}
236 do
237 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
238 done
239 fi
240
241 if [ "${CXXFLAGS/mtune}" != "${CXXFLAGS}" ]
242 then
243 for x in ${SPARC64_CPUS}
244 do
245 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8}"
246 done
247 else
248 for x in ${SPARC64_CPUS}
249 do
250 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
251 done
252 fi
253 }
254
255 append-ldflags() {
256 LDFLAGS="${LDFLAGS} $@"
257 return 0
258 }
259
260 etexec-flags() {
261 has_version 'sys-devel/hardened-gcc' && {
262 debug-print ">>> appending flags -yet_exec"
263 append-flags -yet_exec
264 append-ldflags -yet_exec
265 }
266 }
267
268 fstack-flags() {
269 has_version 'sys-devel/hardened-gcc' && {
270 debug-print ">>> appending flags -yno_propolice"
271 append-flags -yno_propolice
272 append-ldflags -yno_propolice
273 }
274 }

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