configure: Only create serdep.tmp if needed

There's no reason to create this file if none of the serial configure
options are passed.

	* configure.ac: Only create serdep.tmp if needed

diff --git a/configure.ac b/configure.ac
index 39dcf54b6a82f038c51f14c5b619c5189aa0c8fe..90a94480ec5f5924aacb620e32592c16c1cf8a11 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -3206,7 +3206,9 @@ esac
 # These force 'configure's to be done one at a time, to avoid problems
 # with contention over a shared config.cache.
 rm -f serdep.tmp
+if test "x${enable_serial_build_configure}" = xyes || test "x${enable_serial_host_configure}" = xyes || test "x${enable_serial_target_configure}" = xyes; then
 echo '# serdep.tmp' > serdep.tmp
+fi
 olditem=
 test "x${enable_serial_build_configure}" = xyes &&
 for item in ${build_configdirs} ; do