Developers may prefer BoringSSL in their applications because it has fewer features, but they also want to link libmongoc. It would be convenient if BoringSSL could be another option for the TLS library.

It is more work than dropping in BoringSSL. The existing OpenSSL adapter calls some API not available in BoringSSL, such as BIO_new_ssl.

This ticket may be a duplicate of SWIFT-700.