From 977d07a3ae47ef204665d1eda2d642e5064724f3 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Mon, 24 Jun 2019 12:01:19 +0200
Subject: Split build system into library and driver

---
 libbuild2/prerequisite.ixx | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)
 create mode 100644 libbuild2/prerequisite.ixx

(limited to 'libbuild2/prerequisite.ixx')

diff --git a/libbuild2/prerequisite.ixx b/libbuild2/prerequisite.ixx
new file mode 100644
index 0000000..d62af49
--- /dev/null
+++ b/libbuild2/prerequisite.ixx
@@ -0,0 +1,34 @@
+// file      : libbuild2/prerequisite.ixx -*- C++ -*-
+// copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
+// license   : MIT; see accompanying LICENSE file
+
+#include <libbuild2/export.hxx>
+
+namespace build2
+{
+  LIBBUILD2_SYMEXPORT include_type
+  include_impl (action,
+                const target&,
+                const string&,
+                const prerequisite&,
+                const target*);
+
+  LIBBUILD2_SYMEXPORT extern const variable* var_include; // context.cxx
+
+  inline include_type
+  include (action a, const target& t, const prerequisite& p, const target* m)
+  {
+    // Most of the time this variable will not be specified, so let's optimize
+    // for that.
+    //
+    if (p.vars.empty ())
+      return true;
+
+    const string* v (cast_null<string> (p.vars[var_include]));
+
+    if (v == nullptr)
+      return true;
+
+    return include_impl (a, t, *v, p, m);
+  }
+}
-- 
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