Squashed 'boost/' content from commit b4feb19f2

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

tools/build/example/make/foo.py

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+import sys
+open(sys.argv[2], "w").write(open(sys.argv[1]).read())

tools/build/example/make/jamroot.jam

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+import feature ;
+import toolset ;
+import os ;
+
+path-constant HERE : . ;
+make main.cpp : main_cpp.pro : @do-something ;
+
+feature.feature example.python.interpreter : : free ;
+
+toolset.flags do-something PYTHON : <example.python.interpreter> ;
+actions do-something
+{
+    "$(PYTHON:E=python)" "$(HERE)/foo.py" "$(>)" "$(<)"
+}
+
+if [ os.name ] = VMS
+{
+    actions do-something
+    {
+        $(PYTHON:E=python) $(HERE:W)foo.py $(>:W) $(<:W)
+    }
+}

tools/build/example/make/main_cpp.pro

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+int main() {}

tools/build/example/make/readme.txt

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+Copyright 2002, 2005 Vladimir Prus
+Distributed under the Boost Software License, Version 1.0.
+(See accompanying file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt)
+
+
+Example of using custom command to create one file from another, using the
+built-in 'make' rule.