[gtk+] Fix cross references in docs in tarballs

[Matthias Clasen <matthiasc src gnome org>]

commit fd904c69f86d57484f25b4fe3c3a3e5d9cf7ce21
Author: Matthias Clasen <mclasen redhat com>
Date:   Thu Sep 4 00:17:30 2014 -0400

    Fix cross references in docs in tarballs
    
    This approach is copied from Pango.

 Makefile.am                    |    1 +
 configure.ac                   |   10 ++++++++++
 docs/reference/gdk/Makefile.am |    3 ++-
 docs/reference/gtk/Makefile.am |    2 ++
 4 files changed, 15 insertions(+), 1 deletions(-)
---
diff --git a/Makefile.am b/Makefile.am
index d689b3f..3d9d80b 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -124,6 +124,7 @@ snapshot:
 
 DISTCHECK_CONFIGURE_FLAGS =            \
        --enable-gtk-doc                \
+       --disable-doc-cross-references  \
        --enable-man                    \
        --disable-maintainer-mode       \
        --enable-introspection          \
diff --git a/configure.ac b/configure.ac
index 58cc3e3..733f50b 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1724,6 +1724,16 @@ else
   AC_MSG_RESULT([no])
 fi
 
+AC_ARG_ENABLE(doc-cross-references,
+              AC_HELP_STRING([--disable-doc-cross-references],
+                             [cross reference symbols from other libraries @<:@default=yes@:>@]),
+              enable_doc_cross_references=$enableval,
+              enable_doc_cross_references=yes)
+
+AM_CONDITIONAL(ENABLE_DOC_CROSS_REFERENCES, test x$enable_doc_cross_references != xno)
+
+
+
 ##################################################
 # Visibility handling
 ##################################################
diff --git a/docs/reference/gdk/Makefile.am b/docs/reference/gdk/Makefile.am
index f19ae8c..61f9447 100644
--- a/docs/reference/gdk/Makefile.am
+++ b/docs/reference/gdk/Makefile.am
@@ -135,12 +135,13 @@ HTML_IMAGES =                             \
        images/watch.png                \
        images/xterm.png
 
+if ENABLE_DOC_CROSS_REFERENCES
 # Extra options to supply to gtkdoc-fixref
 FIXXREF_OPTIONS= \
        --extra-dir=$(GLIB_PREFIX)/share/gtk-doc/html/gobject \
        --extra-dir=$(GLIB_PREFIX)/share/gtk-doc/html/glib \
        --extra-dir=$(CAIRO_PREFIX)/share/gtk-doc/html/cairo
-
+endif
 
 include $(top_srcdir)/gtk-doc.make
 
diff --git a/docs/reference/gtk/Makefile.am b/docs/reference/gtk/Makefile.am
index f0eeabb..968384c 100644
--- a/docs/reference/gtk/Makefile.am
+++ b/docs/reference/gtk/Makefile.am
@@ -315,6 +315,7 @@ HTML_IMAGES = \
        $(srcdir)/images/flow-box.png                                   \
        $(srcdir)/images/inspector.png
 
+if ENABLE_DOC_CROSS_REFERENCES
 # Extra options to supply to gtkdoc-fixref
 FIXXREF_OPTIONS=--extra-dir=../gdk/html \
        --extra-dir=$(GLIB_PREFIX)/share/gtk-doc/html/gobject \
@@ -323,6 +324,7 @@ FIXXREF_OPTIONS=--extra-dir=../gdk/html \
        --extra-dir=$(ATK_PREFIX)/share/gtk-doc/html/atk \
        --extra-dir=$(PANGO_PREFIX)/share/gtk-doc/html/pango \
        --extra-dir=$(CAIRO_PREFIX)/share/gtk-doc/html/cairo
+endif
 
 include $(top_srcdir)/gtk-doc.make