extended test for X

git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@6291 ec53bebd-3082-4978-b11e-865c3cabbd6b

cf/check-x.m4

@@ -0,0 +1,52 @@
+dnl 
+dnl See if there is any X11 present
+dnl
+dnl $Id$
+
+AC_DEFUN(KRB_CHECK_X,[
+AC_PATH_XTRA
+
+# try to figure out if we need any additional ld flags, like -R
+# and yes, the autoconf X test is utterly broken
+if test "$no_x" != yes; then
+	AC_CACHE_CHECK(for special X linker flags,krb_cv_sys_x_libs_rpath,[
+	ac_save_libs="$LIBS"
+	ac_save_cflags="$CFLAGS"
+	CFLAGS="$CFLAGS $X_CFLAGS"
+	krb_cv_sys_x_libs_rpath=""
+	krb_cv_sys_x_libs=""
+	for rflag in "" "-R" "-R " "-rpath "; do
+		if test "$rflag" = ""; then
+			foo="$X_LIBS"
+		else
+			foo=""
+			for flag in $X_LIBS; do
+			case $flag in
+			-L*)
+				foo="$foo $flag `echo $flag | sed \"s/-L/$rflag/\"`"
+				;;
+			*)
+				foo="$foo $flag"
+				;;
+			esac
+			done
+		fi
+		LIBS="$ac_save_libs $foo -lX11"
+		AC_TRY_RUN([
+		#include <X11/Xlib.h>
+		foo()
+		{
+		XOpenDisplay(NULL);
+		}
+		main()
+		{
+		return 0;
+		}
+		], krb_cv_sys_x_libs_rpath="$rflag"; krb_cv_sys_x_libs="$foo"; break,:)
+	done
+	LIBS="$ac_save_libs"
+	CFLAGS="$ac_save_cflags"
+	])
+	X_LIBS="$krb_cv_sys_x_libs"
+fi
+])