kbuild: fix warning when domainname is not available

Otherwise we get:
"dnsdomainname: Unknown host"

Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>
Acked-by: WANG Cong <xiyou.wangcong@gmail.com>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>

diff --git a/scripts/mkcompile_h b/scripts/mkcompile_h
index 6a12dd9f1181c396f30c1e4c7377e8e0d63402cd..f060763c0c6a0c4304c2da5e473e7d0b59c58da5 100755 (executable)
--- a/scripts/mkcompile_h
+++ b/scripts/mkcompile_h
@@ -66,9 +66,13 @@ UTS_TRUNCATE="sed -e s/\(.\{1,$UTS_LEN\}\).*/\1/"
   echo \#define LINUX_COMPILE_HOST \"`hostname | $UTS_TRUNCATE`\"
 
   if [ -x /bin/dnsdomainname ]; then
-    echo \#define LINUX_COMPILE_DOMAIN \"`dnsdomainname | $UTS_TRUNCATE`\"
+    domain=`dnsdomainname 2> /dev/null`
   elif [ -x /bin/domainname ]; then
-    echo \#define LINUX_COMPILE_DOMAIN \"`domainname | $UTS_TRUNCATE`\"
+    domain=`domainname 2> /dev/null`
+  fi
+
+  if [ -n "$domain" ]; then
+    echo \#define LINUX_COMPILE_DOMAIN \"`echo $domain | $UTS_TRUNCATE`\"
   else
     echo \#define LINUX_COMPILE_DOMAIN
   fi