From e965b8e84ab1ccf0a651bd0753d024ae44fdf7b8 Mon Sep 17 00:00:00 2001
From: Aaron Boman <aaron@aaronboman.com>
Date: Wed, 5 Nov 2014 14:59:05 -0600
Subject: [PATCH] Add support for version.

---
 src/build/version.py | 38 ++++++++++++++++++++++++++++++++++++++
 src/build_system.py  |  2 +-
 2 files changed, 39 insertions(+), 1 deletion(-)
 create mode 100644 src/build/version.py

diff --git a/src/build/version.py b/src/build/version.py
new file mode 100644
index 000000000..1efe3b5c5
--- /dev/null
+++ b/src/build/version.py
@@ -0,0 +1,38 @@
+import os
+import sys
+
+import bjam
+
+
+from b2.manager import get_manager
+
+
+MANAGER = get_manager()
+ERROR_HANDLER = MANAGER.errors()
+
+_major = "2014"
+_minor = "03"
+
+
+def boost_build():
+    return "{}.{}-svn".format(_major, _minor)
+
+
+def verify_engine_version():
+    major, minor, _ = v = bjam.variable('JAM_VERSION')
+    if major != _major or minor != _minor:
+        from textwrap import dedent
+        engine = sys.argv[0]
+        core = os.path.dirname(os.path.dirname(__file__))
+        print dedent("""\
+        warning: mismatched version of Boost.Build engine core
+        warning: Boost.Build engine "{}" is "{}"
+        warning: Boost.Build core at {} is {}
+        """.format(engine, '.'.join(v), core, boost_build()))
+        return False
+    return True
+
+
+def report():
+    if verify_engine_version():
+        print "Boost.Build " + boost_build()
diff --git a/src/build_system.py b/src/build_system.py
index 761506fe8..6bd05d1d9 100644
--- a/src/build_system.py
+++ b/src/build_system.py
@@ -455,7 +455,7 @@ def main_real():
     import b2.build.configure as configure
 
     if "--version" in sys.argv:
-
+        from b2.build import version
         version.report()
         return