[pango] [Makefile.am] Generage ChangeLog from git-log

[Behdad Esfahbod <behdad src gnome org>]

commit a08ef98448054f28d686d8bba8850e44056e33d7
Author: Behdad Esfahbod <behdad behdad org>
Date:   Mon Mar 16 18:07:50 2009 -0400

    [Makefile.am] Generage ChangeLog from git-log
---
 Makefile.am |   17 +++++++++++++++++
 1 files changed, 17 insertions(+), 0 deletions(-)

diff --git a/Makefile.am b/Makefile.am
index 62b5a57..cec2a04 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -49,8 +49,25 @@ MAINTAINERCLEANFILES = \
 	$(srcdir)/mkinstalldirs \
 	$(srcdir)/omf.make \
 	$(srcdir)/xmldocs.make \
+	$(srcdir)/ChangeLog \
 	`find "$(srcdir)" -type f -name Makefile.in -print`
 
+ChangeLog: $(srcdir)/ChangeLog
+$(srcdir)/ChangeLog:
+	@echo Creating $@
+	@if test -d "$(srcdir)/.git"; then \
+	  (GIT_DIR=$(top_srcdir)/.git ./missing --run git log 1.23.0^^.. --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+	      echo Failed to generate ChangeLog, your ChangeLog may be outdated 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
+.PHONY: $(srcdir)/ChangeLog
+
 pkgconfigdir = $(libdir)/pkgconfig
 pkgconfig_DATA = pango.pc