[PATCH macros 2/2] doc: Specify minimum xmlto version to XORG_CHECK_XMLTO

[Dan Nicholson]

Adds an optional parameter to XORG_CHECK_XMLTO to enforce a minimum
version needed like the asciidoc check.

Signed-off-by: Dan Nicholson <dbn.lists at gmail.com>
---
 xorg-macros.m4.in |   16 +++++++++++++++-
 1 files changed, 15 insertions(+), 1 deletions(-)

diff --git a/xorg-macros.m4.in b/xorg-macros.m4.in
index e9eecf2..016f169 100644
--- a/xorg-macros.m4.in
+++ b/xorg-macros.m4.in
@@ -304,7 +304,7 @@ AC_SUBST(MAKE_PDF)
 AC_SUBST(MAKE_HTML)
 ]) # XORG_CHECK_DOCBOOK
 
-# XORG_WITH_XMLTO
+# XORG_WITH_XMLTO([MIN-VERSION])
 # ----------------
 # Minimum version: 1.5.0
 #
@@ -352,6 +352,20 @@ elif test "x$use_xmlto" = x"no" ; then
 else
    AC_MSG_ERROR([--with-xmlto expects 'yes' or 'no'])
 fi
+m4_ifval([$1],
+[if test "$have_xmlto" = yes; then
+    # scrape the xmlto version
+    AC_MSG_CHECKING([the xmlto version])
+    xmlto_version=`$XMLTO --version 2>/dev/null | cut -d' ' -f3`
+    AC_MSG_RESULT([$xmlto_version])
+    AS_VERSION_COMPARE([$xmlto_version], [$1],
+        [if test "x$use_xmlto" = xauto; then
+            AC_MSG_WARN([xmlto version $xmlto_version found, but $1 needed])
+            have_xmlto=no
+        else
+            AC_MSG_ERROR([xmlto version $xmlto_version found, but $1 needed])
+        fi])
+fi])
 AM_CONDITIONAL([HAVE_XMLTO], [test "$have_xmlto" = yes])
 ]) # XORG_CHECK_XMLTO
 
-- 
1.6.6.1