kbuild: improve scripts/gcc-version.sh output a bit when called without args

[linux-3.10.git] / scripts / gcc-version.sh

diff --git a/scripts/gcc-version.sh b/scripts/gcc-version.sh
index 8a1d1879c7ad0a8262eba2e405aa428589419f6e..a5121a6d8949eb6bce96cca1904801f75a8bbe57 100644 (file)
--- a/scripts/gcc-version.sh
+++ b/scripts/gcc-version.sh
@@ -9,10 +9,16 @@
 # gcc-2.95.3, `030301' for gcc-3.3.1, etc.
 #
 
-if [ $1 = "-p" ] ; then with_patchlevel=1; shift; fi
+if [[ $1 = "-p" ]] ; then with_patchlevel=1; shift; fi
 
 compiler="$*"
 
+if [ ${#compiler} -eq 0 ]; then
+       echo "Error: No compiler specified."
+       echo -e "Usage:\n\t$0 <gcc-command>"
+       exit 1
+fi
+
 MAJOR=$(echo __GNUC__ | $compiler -E -xc - | tail -n 1)
 MINOR=$(echo __GNUC_MINOR__ | $compiler -E -xc - | tail -n 1)
 if [ "x$with_patchlevel" != "x" ] ; then