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From 85599643e2fbf70f7f0bd58831993132ef335705 Mon Sep 17 00:00:00 2001
From: Bruno Haible <bruno@clisp.org>
Date: Wed, 22 Jan 2025 21:25:27 +0100
Subject: New module 'version-stamp'.
* m4/version-stamp.m4: New file.
* modules/version-stamp: New file.
---
ChangeLog | 6 ++++++
m4/version-stamp.m4 | 35 +++++++++++++++++++++++++++++++++++
modules/version-stamp | 19 +++++++++++++++++++
3 files changed, 60 insertions(+)
create mode 100644 m4/version-stamp.m4
create mode 100644 modules/version-stamp
--- /dev/null
+++ b/m4/version-stamp.m4
@@ -0,0 +1,35 @@
+# version-stamp.m4
+# serial 1
+dnl Copyright (C) 2025 Free Software Foundation, Inc.
+dnl This file is free software, distributed under the terms of the GNU
+dnl General Public License. As a special exception to the GNU General
+dnl Public License, this file may be distributed as part of a program
+dnl that contains a configuration script generated by Autoconf, under
+dnl the same distribution terms as the rest of that program.
+
+# Manages a stamp file, that keeps track when $(VERSION) was last changed.
+#
+# gl_CONFIG_VERSION_STAMP
+# needs to be invoked near the end of the package's top-level configure.ac,
+# before AC_OUTPUT.
+# It makes sure that during the build,
+# - $(top_srcdir)/.version exists, and
+# - when $(VERSION) is changed, $(top_srcdir)/.version gets modified.
+#
+# $(top_srcdir)/.version is a stamp file. Its contents wouldn't matter,
+# except that for detecting the change, we store the value of $(VERSION)
+# in it (but we could just as well store it in a different file).
+AC_DEFUN([gl_CONFIG_VERSION_STAMP],
+[
+ AC_CONFIG_COMMANDS([version-timestamp],
+ [if test -f "$ac_top_srcdir/.version" \
+ && test `cat "$ac_top_srcdir/.version"` = "$gl_version"; then
+ # The value of $(VERSION) is the same as last time.
+ :
+ else
+ # The value of $(VERSION) has changed. Update the stamp.
+ echo "$gl_version" > "$ac_top_srcdir/.version"
+ fi
+ ],
+ [gl_version="$VERSION"])
+])
--- /dev/null
+++ b/modules/version-stamp
@@ -0,0 +1,19 @@
+Description:
+Optimized rebuilding of artifacts that depend on $(VERSION).
+
+Files:
+m4/version-stamp.m4
+
+Depends-on:
+
+configure.ac:
+
+Makefile.am:
+
+Include:
+
+License:
+GPLed build tool
+
+Maintainer:
+Bruno Haible
|
