pch.py

Boost provides free peer-reviewed portable C++ source libraries. We emphasize libraries that work

#!/usr/bin/python

# 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)

import BoostBuild


t = BoostBuild.Tester()

t.write("jamroot.jam", """
import pch ;
cpp-pch pch : pch.hpp : <toolset>msvc:<source>pch.cpp <include>. ;
exe hello : hello.cpp pch : <include>. ;
""")

t.write("pch.hpp.bad", """
THIS WILL NOT COMPILE
""")

# Note that pch.hpp is written after pch.hpp.bad, so its timestamp will not be
# less than timestamp of pch.hpp.bad.
t.write("pch.hpp", """
class TestClass
{
public:
    TestClass( int, int ) {}
};
""")

t.write("pch.cpp", """#include <pch.hpp>
""")

t.write("hello.cpp", """#include <pch.hpp>
int main() { TestClass c(1, 2); }
""")

t.run_build_system()
t.expect_addition("bin/$toolset/debug/hello.exe")


# Now make the header unusable, without changing timestamp. If everything is OK,
# Boost.Build will not recreate PCH, and compiler will happily use pre-compiled
# header, not noticing that the real header is bad.

t.copy_preserving_timestamp("pch.hpp.bad", "pch.hpp")

t.rm("bin/$toolset/debug/hello.obj")

t.run_build_system()
t.expect_addition("bin/$toolset/debug/hello.obj")

t.cleanup()