link error when using output_test_stream and std::basic_ostringstream

[markstijnman-shell]

When trying to use boost::output_test_stream while using std::ostring elsewhere, I get a link error saying that the destructor of std::basic_ostringstream is already defined in the boost unit_test_framework DLL (using dynamic linking, which is the default in vcpkg).

I have attached a minimal example that shows the problem. It is a simple static library (lib.hpp and lib.cpp) that defines a function using std::ostringstream, and a test file (test.cpp) that uses this function in a test, and includes boost/test/tools/output_test_stream. The example uses CMake to set up the project.
src.zip

When compiling this project, I get the following error:
2>boost_unit_test_framework-vc140-mt.lib(boost_unit_test_framework-vc142-mt-x64-1_75.dll) : error LNK2005: "public: void __cdecl std::basic_ostringstream<char,struct std::char_traits<char>,class std::allocator<char> >::vbase destructor'(void)" (??_D?$basic_ostringstream@DU?$char_traits@D@std@@v?$allocator@D@2@@std@@QEAAXXZ) already defined in test_lib.lib(lib.obj)`

Simply removing the include file for output_test_stream removes the error. Removing std::ostringstream from lib.cpp also removes the link error. Obviously neither are acceptable workarounds in a real project.

I believe this issue is the same as the one reported in this StackOverflow post, which was also reported to the boost mailing list here. Hopefully by reporting it here with a minimal example, it can now be addressed, as it should now be easily seen that this isn't a matter of mixing runtimes.