build: don't require src/bison during bootstrap.

Suggested by Eric Blake at
<http://lists.gnu.org/archive/html/bug-bison/2010-03/msg00003.html>.
* bootstrap.conf (bootstrap_epilogue): New function to make sure
src/parse-gram.[ch] are stamped later than src/parse-gram.y.

2 files changed, 15 insertions, 0 deletions

diff --git a/ChangeLog b/ChangeLog
index 98d8eaf4..18b09465 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,11 @@
+2010-04-25  Joel E. Denny  <joeldenny@joeldenny.org>
+
+	build: don't require src/bison during bootstrap.
+	Suggested by Eric Blake at
+	<http://lists.gnu.org/archive/html/bug-bison/2010-03/msg00003.html>.
+	* bootstrap.conf (bootstrap_epilogue): New function to make sure
+	src/parse-gram.[ch] are stamped later than src/parse-gram.y.
+
 2010-04-11  Joel E. Denny  <joeldenny@joeldenny.org>
 
 	* NEWS (2.4.3): Mention fix for Sun Studio C++.
diff --git a/bootstrap.conf b/bootstrap.conf
index fc5a0e96..c8993fed 100644
--- a/bootstrap.conf
+++ b/bootstrap.conf
@@ -65,3 +65,10 @@ excluded_files='
 # In directories like lib/, m4/, and po/, generate both these files because we
 # still try to support CVS emulation.
 vc_ignore='.cvsignore .gitignore'
+
+bootstrap_epilogue()
+{
+  # Make sure we don't need src/bison, which usually doesn't exist at
+  # the time of a bootstrap.
+  touch src/parse-gram.[ch]
+}