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>
diff --git a/configure b/configure
index 38e3724..9bfe917 100755
--- a/configure
+++ b/configure
@@ -2510,6 +2510,29 @@
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
