CMSCOPE changed

1 files changed, 44 insertions, 0 deletions

diff --git a/m4/symlinks.m4 b/m4/symlinks.m4
new file mode 100755
index 000000000..60af9363e
--- /dev/null
+++ b/m4/symlinks.m4
@@ -0,0 +1,44 @@
+
+dnl ===============================================================
+dnl FOLLOW_SYMLINKS <path>
+dnl Follows symbolic links on <path>,
+dnl
+dnl Arguments:
+dnl the file which want to resolve the real file
+dnl the real name of the file (for example, if we are looking for javac and 
+dnl it is a symlink to /usr/bin/gcj, we want to stay in the java dir where
+dnl javac is found
+dnl 
+dnl VARIABLES SET:
+dnl SYMLINK_FOLLOWED_TO the "real" file
+dnl ===============================================================
+
+AC_DEFUN([FOLLOW_SYMLINKS],[
+	
+	dnl find the include directory relative to the executable
+	_cur="$1"
+	if test ! -z "$2"; then
+		_fileNameWanted=$2
+	else
+		_fileNameWanted=$1
+	fi
+	while ls -ld "$_cur" 2>/dev/null | grep " -> " >/dev/null; do
+		AC_MSG_CHECKING(Symlink for $_cur)
+
+		_slink=`ls -ld "$_cur" | sed 's/.* -> //'`	
+		if test "$_fileNameWanted" != "`basename $_slink`"; then
+			AC_MSG_RESULT(Filename changed... Keeping the one found before)
+			break
+		fi
+		case "$_slink" in
+			/*)
+				_cur="$_slink";;
+			# 'X' avoids triggering unwanted echo options.
+			*)
+				_cur=`echo "X$_cur" | sed -e 's/^X//' -e 's:[[^/]]*$::'`"$_slink";;
+		esac
+		AC_MSG_RESULT($_cur)
+	done
+	SYMLINK_FOLLOWED_TO="$_cur"
+])# FOLLOW_SYMLINKS
+