xml check fix cross your fingers

Original commit message from CVS:
xml check fix
cross your fingers

diff --git a/m4/gst-libxml2.m4 b/m4/gst-libxml2.m4
index 4cda73c..9041ec9 100644 (file)
--- a/m4/gst-libxml2.m4
+++ b/m4/gst-libxml2.m4
@@ -1,17 +1,36 @@
-AC_DEFUN(GST_LIBXML2_CHECK, [
-dnl Minimum required version of libxml2
-LIBXML2_REQ="2.4.0"
-AC_SUBST(LIBXML2_REQ)
+AC_DEFUN(GST_LIBXML2_CHECK,
+[
+  dnl Minimum required version of libxml2
+  LIBXML2_REQ="2.4.0"
+  AC_SUBST(LIBXML2_REQ)
 
-dnl check for libxml2
-LIBXML_PKG=', libxml-2.0'
-PKG_CHECK_MODULES(XML, libxml-2.0 >= $LIBXML2_REQ, HAVE_LIBXML2=yes, HAVE_LIBXML2=no)
-if test "x$HAVE_LIBXML2" = "xyes"; then
-  AC_DEFINE(HAVE_LIBXML2, 1, [Define if libxml2 is available])
-else
-  AC_MSG_ERROR([Need libxml2 for glib2 builds -- you should be able to do without it -- this needs fixing])
-fi
-AC_SUBST(LIBXML_PKG)
-AC_SUBST(XML_LIBS)
-AC_SUBST(XML_CFLAGS)
+  dnl check for libxml2
+  PKG_CHECK_MODULES(XML, libxml-2.0 >= $LIBXML2_REQ, 
+                    HAVE_LIBXML2=yes, HAVE_LIBXML2=no)
+  if test "x$HAVE_LIBXML2" = "xyes"; then
+    AC_DEFINE(HAVE_LIBXML2, 1, [Define if libxml2 is available])
+  else
+    AC_MSG_ERROR([Need libxml2 for glib2 builds -- you should be able to do without it -- this needs fixing])
+  fi
+  AC_SUBST(LIBXML_PKG)
+  AC_SUBST(XML_LIBS)
+  AC_SUBST(XML_CFLAGS)
+
+  dnl XML_LIBS might pull in -lz without zlib actually being on the system, so
+  dnl try linking with these LIBS and CFLAGS
+  ac_save_CFLAGS=$CFLAGS
+  ac_save_LIBS=$LIBS
+  CFLAGS="$CFLAGS $XML_CFLAGS"
+  LIBS="$LIBS $XML_LIBS"
+  AC_TRY_LINK([
+#include <libxml/tree.h>
+#include <stdio.h>
+],[ 
+/* function body */
+],
+    AC_MSG_NOTICE([Test xml2 program linked]),
+    AC_MSG_ERROR([Could not link libxml2 test program.  Check if you have the necessary dependencies.])
+  )
+  CFLAGS="$ac_save_CFLAGS"
+  LIBS="$ac_save_LIBS"
 ])