6ce99625ca
libatf-c++ requires C++ support. From jrtc27: bit slightly odd this isn't gated by MK_TESTS (which itself depends on MK_CXX), but this makes sense given the current behaviour. Reported by: Michael Dexter, Build Option Survey Reviewed by: imp, jrtc27 Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D32732