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.)