[mm-common] Do not fail hard if glibmm doctools are missing

[Daniel Elstner <daniel src gnome org>]

commit d8fb1e1ff4023f69e525c809011b72e85447c072
Author: Daniel Elstner <danielk openismus com>
Date:   Fri Aug 28 15:59:35 2009 +0200

    Do not fail hard if glibmm doctools are missing
    
    * macros/mm-doc.m4 (_MM_CONFIG_DOCTOOL_DIR): Do not yet verify at this
    point whether the directory returned by pkg-config is valid.
    (_MM_ARG_ENABLE_DOCUMENTATION): Check the value of $MMDOCTOOLDIR here,
    but do do not abort even if not set, unless --enable-documentation has
    been explicitly requested.

 macros/mm-doc.m4 |   40 +++++++++++++++++++---------------------
 1 files changed, 19 insertions(+), 21 deletions(-)
---
diff --git a/macros/mm-doc.m4 b/macros/mm-doc.m4
index 10e6f82..70297d1 100644
--- a/macros/mm-doc.m4
+++ b/macros/mm-doc.m4
@@ -15,7 +15,7 @@
 ## You should have received a copy of the GNU General Public License
 ## along with mm-common.  If not, see <http://www.gnu.org/licenses/>.
 
-#serial 20090822
+#serial 20090828
 
 ## _MM_CONFIG_DOCTOOL_DIR
 ##
@@ -40,13 +40,6 @@ make sure that any separate development package for glibmm is installed
 as well.  If you built glibmm yourself, it may be necessary to adjust
 the PKG_CONFIG_PATH environment variable for pkg-config to find it.
 ]])])
-  AS_IF([test "x$MMDOCTOOLDIR" = x],
-        [AC_MSG_ERROR([[not found
-The glibmm module is available, but the installation of glibmm on this
-machine is missing the shared documentation utilities of the GNOME C++
-bindings.  It may be necessary to upgrade to a more recent release of
-glibmm in order to build $PACKAGE_NAME.
-]])])
 ])
 AC_MSG_RESULT([$MMDOCTOOLDIR])[]dnl
 ])
@@ -97,7 +90,12 @@ AC_ARG_ENABLE([documentation],
 AS_IF([test "x$ENABLE_DOCUMENTATION" != xno],
 [
   mm_err=
-  AS_IF([test "x$PERL" = xperl], [mm_err='Perl is required for installing the documentation.'],
+  AS_IF([test "x$MMDOCTOOLDIR" = x], [mm_err='dnl
+The glibmm module is available, but the installation of glibmm on this
+machine is missing the shared documentation utilities of the GNOME C++
+bindings.  It may be necessary to upgrade to a more recent release of
+glibmm in order to build '$PACKAGE_NAME' and install the documentation.'],
+        [test "x$PERL" = xperl], [mm_err='Perl is required for installing the documentation.'],
         [test "x$USE_MAINTAINER_MODE" != xno],
   [
     test "x$DOT" != xdot || mm_err=' dot'
@@ -115,18 +113,6 @@ AC_SUBST([DOXYGEN_TAGFILES], [[]])
 AC_SUBST([DOCINSTALL_FLAGS], [[]])[]dnl
 ])
 
-## _MM_TR_URI(shell-expression)
-##
-## Internal macro that expands to a reusable shell construct which
-## functions as a poor man's filesystem path to URI translator.
-## The input <shell-expression> is expanded within double quotes.
-##
-m4_define([_MM_TR_URI],
-[dnl
-[`expr "X$1" : 'X\(.*[^\\/]\)[\\/]*' 2>&]AS_MESSAGE_LOG_FD[ |]dnl
-[ sed 's|[\\]|/|g;s| |%20|g;s|^/|file:///|;s|^.:/|file:///&|' 2>&]AS_MESSAGE_LOG_FD[`]dnl
-])
-
 ## MM_ARG_ENABLE_DOCUMENTATION
 ##
 ## Provide the --disable-documentation configure option.  By default,
@@ -152,6 +138,18 @@ AC_REQUIRE([MM_PATH_PERL])[]dnl
 AC_REQUIRE([_MM_ARG_ENABLE_DOCUMENTATION])[]dnl
 ])
 
+## _MM_TR_URI(shell-expression)
+##
+## Internal macro that expands to a reusable shell construct which
+## functions as a poor man's filesystem path to URI translator.
+## The input <shell-expression> is expanded within double quotes.
+##
+m4_define([_MM_TR_URI],
+[dnl
+[`expr "X$1" : 'X\(.*[^\\/]\)[\\/]*' 2>&]AS_MESSAGE_LOG_FD[ |]dnl
+[ sed 's|[\\]|/|g;s| |%20|g;s|^/|file:///|;s|^.:/|file:///&|' 2>&]AS_MESSAGE_LOG_FD[`]dnl
+])
+
 ## _MM_ARG_WITH_TAGFILE_DOC(option-basename, pkg-variable, tagfilename, [module])
 ##
 m4_define([_MM_ARG_WITH_TAGFILE_DOC],