From c092793e74d0778b0aff653860f274c8cc31c374 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Mon, 7 Dec 2015 12:14:36 +0200
Subject: Add version file

---
 build/b.cxx   |  5 +++--
 build/version | 39 +++++++++++++++++++++++++++++++++++++++
 2 files changed, 42 insertions(+), 2 deletions(-)
 create mode 100644 build/version

diff --git a/build/b.cxx b/build/b.cxx
index 9a88721..3eab437 100644
--- a/build/b.cxx
+++ b/build/b.cxx
@@ -16,9 +16,10 @@
 #include <iostream>
 #include <system_error>
 
-#include <butl/version>
 #include <butl/filesystem>
 
+#include <build/version>
+
 #include <build/types>
 #include <build/spec>
 #include <build/operation>
@@ -66,7 +67,7 @@ main (int argc, char* argv[])
     //
     if (ops.version ())
     {
-      cout << "build2 0.1.0.a1" << endl
+      cout << "build2 " << BUILD_VERSION_STR<< endl
            << "libbutl " << LIBBUTL_VERSION_STR << endl
            << "Copyright (c) 2014-2015 Code Synthesis Ltd" << endl
            << "This is free software released under the MIT license." << endl;
diff --git a/build/version b/build/version
new file mode 100644
index 0000000..770cf99
--- /dev/null
+++ b/build/version
@@ -0,0 +1,39 @@
+// file      : build/version -*- C++ -*-
+// copyright : Copyright (c) 2014-2015 Code Synthesis Ltd
+// license   : MIT; see accompanying LICENSE file
+
+#ifndef BUILD_VERSION // Note: using the version macro itself.
+
+#include <butl/version> // LIBBUTL_VERSION
+
+// Version format is AABBCCDD where
+//
+// AA - major version number
+// BB - minor version number
+// CC - bugfix version number
+// DD - alpha / beta (DD + 50) version number
+//
+// When DD is not 00, 1 is subtracted from AABBCC. For example:
+//
+// Version     AABBCCDD
+// 2.0.0       02000000
+// 2.1.0       02010000
+// 2.1.1       02010100
+// 2.2.0.a1    02019901
+// 3.0.0.b2    02999952
+//
+
+// Generally, we expect minor versions to be source code backwards-
+// compatible, thought we might have a minimum version requirement.
+//
+//                     AABBCCDD
+#if (LIBBUTL_VERSION <     9901 || \
+     LIBBUTL_VERSION >   990000)
+#  error incompatible libbutl version
+#endif
+
+//                        AABBCCDD
+#define BUILD_VERSION         9901
+#define BUILD_VERSION_STR "0.1.0.a1"
+
+#endif // BUILD_VERSION
-- 
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