Add a rule to generate ChangeLog

We use the same rule pango uses to create a ChangeLog file with
the help of git-log. The format is somewhat different from traditional
ChangeLog, but it contains the relevant information.

diff --git a/Makefile.am b/Makefile.am
index 3fdb9f270671a07add1d6687b7ab0d6314ec969f..e1bd48e8ad1f41f32e2f30b099330dff3e460695 100644 (file)
--- a/Makefile.am
+++ b/Makefile.am
@@ -19,6 +19,9 @@ EXTRA_DIST +=                 \
        ChangeLog.pre-2-6       \
        ChangeLog.pre-2-8       \
        ChangeLog.pre-2-10      \
+       ChangeLog.pre-2-12      \
+       ChangeLog.pre-2-14      \
+       ChangeLog.pre-2-16      \
        ChangeLog.gtk-async-file-chooser        \
        ChangeLog.gtk-printing  \
        README.commits  \
@@ -152,6 +155,20 @@ DISTCLEANFILES =                           \
        gail-uninstalled.pc                     \
        config.lt
 
+ChangeLog:
+       @echo Creating $@
+       @if test -d "$(srcdir)/.git"; then \
+         (GIT_DIR=$(top_srcdir)/.git ./missing --run git log GTK_2_16_0^^.. --stat) | fmt --split-only > $@.tmp \
+         && mv -f $@.tmp $@ \
+         || ($(RM) $@.tmp; \
+             echo Failed to generate ChangeLog, your ChangeLog may be outdated >&2; \
+             (test -f $@ || echo git-log is required to generate this file >> $@)); \
+       else \
+         test -f $@ || \
+         (echo A git checkout and git-log is required to generate ChangeLog >&2 && \
+         echo A git checkout and git-log is required to generate this file >> $@); \
+       fi
+
 ## copy the default target for this platform to gdk-2.0.pc and gtk+-2.0.pc
 DEFAULT_GDKTARGET=x11
 install-data-hook:
@@ -176,7 +193,7 @@ dist-hook:
             && cp INSTALL README $(distdir) ; \
        fi
 
-.PHONY: files release sanity snapshot
+.PHONY: files release sanity snapshot ChangeLog
 
 files:
        @files=`ls $(DISTFILES) 2> /dev/null `; for p in $$files; do \