/[gentoo-x86]/eclass/flag-o-matic.eclass
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Revision 1.29 - (show annotations) (download)
Fri Oct 31 23:03:40 2003 UTC (10 years, 10 months ago) by puggy
Branch: MAIN
Changes since 1.28: +26 -1 lines
Added strip-unsupported-flags as per bug #26390

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 1.28 2003/10/26 00:40:52 vapier Exp $
4 #
5 # Author Bart Verwilst <verwilst@gentoo.org>
6
7 ECLASS=flag-o-matic
8 INHERITED="$INHERITED $ECLASS"
9
10 #
11 #### filter-flags <flags> ####
12 # Remove particular flags from C[XX]FLAGS
13 # Matches only complete flags
14 #
15 #### append-flags <flags> ####
16 # Add extra flags to your current C[XX]FLAGS
17 #
18 #### replace-flags <orig.flag> <new.flag> ###
19 # Replace a flag by another one
20 #
21 #### is-flag <flag> ####
22 # Returns "true" if flag is set in C[XX]FLAGS
23 # Matches only complete a flag
24 #
25 #### strip-flags ####
26 # Strip C[XX]FLAGS of everything except known
27 # good options.
28 #
29 #### strip-unsupported-flags ####
30 # Strip C[XX]FLAGS of any flags not supported by
31 # installed version of gcc
32 #
33 #### get-flag <flag> ####
34 # Find and echo the value for a particular flag
35 #
36 #### replace-sparc64-flags ####
37 # Sets mcpu to v8 and uses the original value
38 # as mtune if none specified.
39 #
40 #### filter-mfpmath <math types> ####
41 # Remove specified math types from the fpmath specification
42 # If the user has -mfpmath=sse,386, running `filter-mfpmath sse`
43 # will leave the user with -mfpmath=386
44 #
45 #### append-ldflags ####
46 # Add extra flags to your current LDFLAGS
47 #
48 #### etexec-flags ####
49 # hooked function for hardened-gcc that appends
50 # -yet_exec {C,CXX,LD}FLAGS when hardened-gcc is installed
51 # and a package is filtering -fPIC
52 #
53 #### fstack-flags ####
54 # hooked function for hardened-gcc that appends
55 # -yno_propolice to {C,CXX,LD}FLAGS when hardened-gcc is installed
56 # and a package is filtering -fstack-protector
57 #
58
59 # C[XX]FLAGS that we allow in strip-flags
60 ALLOWED_FLAGS="-O -O1 -O2 -mcpu -march -mtune -fstack-protector -pipe -g"
61 case "${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} ${x}"
170 break
171 fi
172 done
173 done
174
175 set +f
176
177 [ `use debug` ] \
178 && einfo "CFLAGS=\"${NEW_CFLAGS}\"" \
179 && einfo "CXXFLAGS=\"${NEW_CXXFLAGS}\""
180
181 export CFLAGS="${NEW_CFLAGS}"
182 export CXXFLAGS="${NEW_CXXFLAGS}"
183 }
184
185 test_flag () {
186 if gcc -S -xc $1 -o /dev/null /dev/null >/dev/null 2>&1; then
187 echo "$1"
188 fi
189 }
190
191 strip-unsupported-flags() {
192 for x in ${CFLAGS}
193 do
194 NEW_CFLAGS=${NEW_CFLAGS}" ""`test_flag ${x}`"
195 done
196
197 for x in ${CXXFLAGS}
198 do
199 NEW_CXXFLAGS=${NEW_CXXFLAGS}" ""`test_flag ${x}`"
200 done
201
202 CFLAGS="${NEW_CFLAGS}"
203 CXXFLAGS="${NEW_CXXFLAGS}"
204 }
205
206 get-flag() {
207 local findflag="$1"
208 for f in ${CFLAGS} ${CXXFLAGS} ; do
209 if [ "${f/${findflag}}" != "${f}" ] ; then
210 echo "${f/-${findflag}=}"
211 return 0
212 fi
213 done
214 return 1
215 }
216
217 replace-sparc64-flags() {
218 local SPARC64_CPUS="ultrasparc v9"
219
220 if [ "${CFLAGS/mtune}" != "${CFLAGS}" ]
221 then
222 for x in ${SPARC64_CPUS}
223 do
224 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8}"
225 done
226 else
227 for x in ${SPARC64_CPUS}
228 do
229 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
230 done
231 fi
232
233 if [ "${CXXFLAGS/mtune}" != "${CXXFLAGS}" ]
234 then
235 for x in ${SPARC64_CPUS}
236 do
237 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8}"
238 done
239 else
240 for x in ${SPARC64_CPUS}
241 do
242 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
243 done
244 fi
245 }
246
247 append-ldflags() {
248 LDFLAGS="${LDFLAGS} $@"
249 return 0
250 }
251
252 etexec-flags() {
253 has_version 'sys-devel/hardened-gcc' && {
254 debug-print ">>> appending flags -yet_exec"
255 append-flags -yet_exec
256 append-ldflags -yet_exec
257 }
258 }
259
260 fstack-flags() {
261 has_version 'sys-devel/hardened-gcc' && {
262 debug-print ">>> appending flags -yno_propolice"
263 append-flags -yno_propolice
264 append-ldflags -yno_propolice
265 }
266 }

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