[build] Add a ChangeLog generation rule

Just like Clutter, we need to generate a proper ChangeLog when
distchecking so that users of the tarball will still have a
detailed list of changes.

diff --git a/Makefile.am b/Makefile.am
index 785728d..e2c500a 100644 (file)
--- a/Makefile.am
+++ b/Makefile.am
@@ -19,3 +19,17 @@ DISTCLEANFILES = clutter-gtk.pc
 EXTRA_DIST = clutter-gtk.pc.in
 
 DISTCHECK_CONFIGURE_FLAGS = --enable-gtk-doc --enable-maintainer-flags
+
+dist-hook:
+       @if test -d "$(srcdir)/.git"; \
+       then \
+               echo Creating ChangeLog && \
+               ( cd "$(top_srcdir)" && \
+                 echo '# Generated by configure.  Do NOT edit.'; echo; \
+                 $(top_srcdir)/missing --run git log --stat ) > ChangeLog.tmp \
+               && mv -f ChangeLog.tmp "$(top_distdir)/ChangeLog" \
+               || ( rm -f ChangeLog.tmp ; \
+                    echo Failed to generate ChangeLog >&2 ); \
+       else \
+               echo A git clone is required to generate a ChangeLog >&2; \
+       fi