1 files changed, 52 insertions, 0 deletions
diff --git a/common/m4/gst-libxml2.m4 b/common/m4/gst-libxml2.m4
new file mode 100755
index 0000000..4a843f0
--- /dev/null
+++ b/common/m4/gst-libxml2.m4
@@ -0,0 +1,52 @@
+dnl call this macro with the minimum required version as an argument
+dnl this macro sets and AC_SUBSTs XML_CFLAGS and XML_LIBS
+dnl it also sets LIBXML_PKG, used for the pkg-config file
+
+AC_DEFUN([AG_GST_LIBXML2_CHECK],
+[
+  dnl Minimum required version of libxml2
+  dnl default to 2.4.9 if not specified
+  LIBXML2_REQ=ifelse([$1],,2.4.9,[$1])
+  AC_SUBST(LIBXML2_REQ)
+
+  dnl check for libxml2
+  PKG_CHECK_MODULES(XML, libxml-2.0 >= $LIBXML2_REQ,
+                    HAVE_LIBXML2=yes, [
+                      AC_MSG_RESULT(no)
+                      HAVE_LIBXML2=no
+                    ])
+  if test "x$HAVE_LIBXML2" = "xyes"; then
+    AC_DEFINE(HAVE_LIBXML2, 1, [Define if libxml2 is available])
+  else
+    AC_MSG_ERROR([
+        Need libxml2 and development headers/files to build GStreamer.
+
+        You can do without libxml2 if you pass --disable-loadsave to
+        configure, but that breaks ABI, so don't do that unless you
+        are building for an embedded setup and know what you are doing.
+    ])
+  fi
+  dnl this is for the .pc file
+  LIBXML_PKG=', libxml-2.0'
+  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"
+])