# HG changeset patch
# User Mike Miller <mtmiller@octave.org>
# Date 1437703239 14400
# Node ID 107bb934dc199ac24ff1e1469367412f2c044980
# Parent  1625e6bd5ce7354ab70eb85d19d3d1d4927d0df2
build: Always generate ChangeLog if missing, and write to build directory

* Makefile.am (changelog-from-hg-log): Write generated ChangeLog to build
directory.  If no hg log available, write a dummy ChangeLog if file doesn't
already exist.

diff --git a/Makefile.am b/Makefile.am
--- a/Makefile.am
+++ b/Makefile.am
@@ -197,13 +197,16 @@
 
 define changelog-from-hg-log
   rm -f $@-t && \
-  cd $(srcdir) && \
-  if [ -d .hg ]; then \
-    ( hg log --style=build-aux/changelog.tmpl --prune=b0e60ad4ae26 --only-branch=`hg branch`; \
+  if [ -d $(srcdir)/.hg ]; then \
+    ( cd $(srcdir); \
+      hg log --style=build-aux/changelog.tmpl --prune=b0e60ad4ae26 --only-branch=`hg branch`; \
       echo ""; \
       echo "See the files in the directory etc/OLD-ChangeLogs for changes before 2011-04-19"; \
     ) > $@-t && \
     mv $@-t $@; \
+  elif [ ! -f $@ ] && [ ! -f $(srcdir)/$@ ]; then \
+    echo "Empty ChangeLog generated because no hg log available" > $@-t && \
+    mv $@-t $@; \
   fi
 endef