From 593fd960891027b97567b2622ed4b6c16070ab36 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Fri, 28 Apr 2017 08:33:42 +0200
Subject: Implement support for pre-processing version headers (or other files)

Also implement the build system version check.
---
 build2/utility | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

(limited to 'build2/utility')

diff --git a/build2/utility b/build2/utility
index 2bcc52c..95766a4 100644
--- a/build2/utility
+++ b/build2/utility
@@ -16,8 +16,8 @@
 
 #include <butl/ft/lang>
 
-#include <butl/utility> // combine_hash(), reverse_iterate(), casecmp(),
-                        // lcase(), etc
+#include <butl/utility> // combine_hash(), reverse_iterate(), case*(), etc
+#include <butl/standard-version>
 
 #include <unordered_set>
 
@@ -104,6 +104,10 @@ namespace build2
   //
   extern process_path argv0;
 
+  // Build system driver version.
+  //
+  extern butl::standard_version build_version;
+
   // Work/home directories (must be initialized in main()) and relative path
   // calculation.
   //
-- 
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