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vhost build fix for i386 

vhost.c uses __sync_fetch_and_and(), which is only
available for -march=i486 and above (see
https://bugzilla.redhat.com/show_bug.cgi?id=624279).

Signed-off-by: Wolfgang Mauerer <wolfgang.mauerer@siemens.com>
Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
This commit is contained in:
Wolfgang Mauerer 2011-07-11 14:57:43 +02:00 committed by Stefan Hajnoczi
parent c886edfb85
commit 023367e6cd
1 changed files with 23 additions and 0 deletions
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23
configure vendored
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@ -2509,6 +2509,29 @@ if test "$trace_backend" = "dtrace"; then
fi
fi
##########################################
# __sync_fetch_and_and requires at least -march=i486. Many toolchains
# use i686 as default anyway, but for those that don't, an explicit
# specification is necessary
if test $vhost_net = "yes" && test $cpu = "i386"; then
cat > $TMPC << EOF
int sfaa(unsigned *ptr)
{
return __sync_fetch_and_and(ptr, 0);
}
int main(int argc, char **argv)
{
int val = 42;
sfaa(&val);
return val;
}
EOF
if ! compile_prog "" "" ; then
CFLAGS+="-march=i486"
fi
fi
##########################################
# End of CC checks
# After here, no more $cc or $ld runs