As of this commit, phosphor-logging is now enabled to be built with meson instead of autotools and it can be imported as a meson-subproject. This means that now all the fundamental libraries used in OpenBMC are available as meson subprojects, so you should be able to structure any meson-based openbmc repository such that it can compile easily on any typical Linux development system outside of an OE-SDK.

I plan to work today on getting the corresponding Yocto recipes updated as well.