Boost.Test, link=shared, and main

Some libraries (e.g. Proto until yesterday, Range, Xpressive) have test .cpp files that look like this:

#include <boost/test/unit_test.hpp>

void my_test_function()
{
    // tests here
}

boost::unit_test::test_suite*
init_unit_test_suite(int argc, char* argv[])
{
    boost::unit_test::test_suite* test
        = BOOST_TEST_SUITE( "my test suite name" );

    test->add( BOOST_TEST_CASE( &my_test_function ) );

    return test;
}

This works when Boost.Test is linked as a static library, because it then supplies a `main` function.

It doesn't link with link=shared, because then there's no `main`.

What's the easiest, least invasive, way to make this work with link=shared?
In principle, one is supposed to define BOOST_TEST_MAIN. But this doesn't
work, because when BOOST_TEST_MAIN is defined, Boost.Test defines not
just `main`, but `init_unit_test_suite` as well. And defining `main` also doesn't
work, because when using shared linking, Boost.Test automatically defines
BOOST_TEST_ALTERNATIVE_INIT_API, which changes the expected signature
of init_unit_test_suite to one returning not boost::unit_test::test_suite* but
bool.

The current tests work around this by using <link>static as a requirement in
test/Jamfile, but this has become a problem when testing with CMake since
I added these libraries there. Testing Boost with BUILD_SHARED_LIBS=ON now
doesn't work.

(I updated the Proto tests to use BOOST_AUTO_TEST_CASE instead and this
works, but is (a) too much work and (b) error prone. There should be an easier
way to support the above use.)


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