From f272378d52e28b937219121e8b90883df8a10012 Mon Sep 17 00:00:00 2001
From: Jim Meyering <meyering@redhat.com>
Date: Fri, 10 Jul 2009 10:01:04 +0200
Subject: build: automatically rerun ./bootstrap when needed

When "git pull" (or any other operation) brings in a new version of the
gnulib git submodule, you must rerun the autogen.sh script.  With this
change, "make" now fails and tells you to run ./autogen.sh, when needed.
* autogen.sh: Maintain a new file, .git-module-status, containing
the current submodule status.  If it doesn't exist or its content
is different from what "git submodule status" prints, then run
./bootstrap
* .gitignore: Add .git-module-status
* cfg.mk: Diagnose out of date submodule and fail.
* README-hacking: Update not to mention bootstrap.
* Makefile.am (MAINTAINERCLEANFILES): Add .git-module-status,
so that "make maintainerclean" will remove it.
---
 autogen.sh | 11 +++++++++++
 1 file changed, 11 insertions(+)

(limited to 'autogen.sh')

diff --git a/autogen.sh b/autogen.sh
index e6bde33ae..415f3ec6d 100755
--- a/autogen.sh
+++ b/autogen.sh
@@ -54,6 +54,17 @@ if test -z "$*"; then
         echo "to pass any to it, please specify them on the $0 command line."
 fi
 
+# Ensure that whenever we pull in a gnulib update or otherwise change to a
+# different version (i.e., when switching branches), we also rerun ./bootstrap.
+curr_status=.git-module-status
+t=$(git submodule status)
+if test "$t" = "$(cat $curr_status 2>/dev/null)"; then
+    : # good, it's up to date
+else
+  echo running bootstrap...
+  ./bootstrap && echo "$t" > $curr_status
+fi
+
 # Automake requires that ChangeLog exist.
 touch ChangeLog
 
-- 
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