Use --ccache to enable ccache for builds

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@6543 a1c6a512-1295-4272-9138-f99709370657

tools/configure

@@ -278,9 +278,16 @@ if test "$1" = "--help"; then
   echo "Rockbox configure script."
   echo "Invoke this in a directory to generate a Makefile to build Rockbox"
   echo "Do *NOT* run this within the tools directory!"
+  echo ""
+  echo "Usage: configure [--ccache]"
   exit
 fi
 
+if test "$1" = "--ccache"; then
+  echo "Enable ccache for building"
+  ccache="yes"
+fi
+
 if test -r "configure"; then
  # this is a check for a configure script in the current directory, it there
  # is one, try to figure out if it is this one!
@@ -627,6 +634,10 @@ else
 
 fi
 
+if test "X$ccache" = "Xyes"; then
+  CC="ccache $CC"
+fi
+
 if test "X$endian" = "Xbig"; then
   defendian="ROCKBOX_BIG_ENDIAN"
 else