Re: [boost] Boost CMake update

paul wrote:

But you are requiring that X 1.64 only to use Y 1.64. If we want it that once its built, it keeps using the same version, we can have `bcm_auto_export` to always generate the `find_dependency` with an `EXACT` argument using the version Y it is built with.

You're right, this is exactly what we need to do. Since in the superproject case find_package is overridden to do nothing, there's no need to version-lock it. People who install a library separately would presumably know what they're doing.