Squashed 'boost/' content from commit b4feb19f2

git-subtree-dir: boost
git-subtree-split: b4feb19f287ee92d87a9624b5d36b7cf46aeadeb

tools/build/example/pch/include/pch.hpp

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+/* Copyright 2006 Vladimir Prus
+
+   Distributed under the Boost Software License, Version 1.0. (See
+   accompanying file LICENSE_1_0.txt or copy at
+   http://www.boost.org/LICENSE_1_0.txt)
+*/
+
+#ifdef BOOST_BUILD_PCH_ENABLED
+
+#ifdef FOO2
+int bar();
+#endif
+
+class TestClass {
+public:
+    TestClass(int, int) {}
+};
+
+#endif

tools/build/example/pch/jamroot.jam

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+# Copyright 2006 Ilya Sokolov
+#
+# Distributed under the Boost Software License, Version 1.0. (See
+# accompanying file LICENSE_1_0.txt or copy at
+# http://www.boost.org/LICENSE_1_0.txt)
+
+# pch ##########################################################################
+
+import pch ;
+
+cpp-pch pch
+  : # sources
+    include/pch.hpp
+  : # requirements
+    <include>include
+  ;
+explicit pch ;
+
+# exe ##########################################################################
+
+exe hello_world
+  : # sources
+    pch
+    source/hello_world.cpp
+  : # requirements
+    <include>include
+  : # default build
+  : # usage requirements
+  ;

tools/build/example/pch/source/hello_world.cpp

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+/* Copyright 2006 Ilya Sokolov
+   Copyright 2006 Vladimir Prus
+
+   Distributed under the Boost Software License, Version 1.0. (See
+   accompanying file LICENSE_1_0.txt or copy at
+   http://www.boost.org/LICENSE_1_0.txt)
+*/
+
+#include <pch.hpp>
+
+int main()
+{
+  TestClass c(1, 2);    
+  return 0;
+}