libboost-headers CMake 3.30 compatibility

[mgovers]

Comment:

Is there a way to get libboost-headers (or equivalent; i.e. without any binaries) as well as a BoostConfig.cmake file?

We develop tooling with a header-only core and use conda-forge/libboost-headers to install the installed Boost headers as a dependency (for Windows). Up until recently, that has worked just fine. Recently, however, CMake has decided to phase out FindBoost.cmake. That means that we are unfortunately forced to either:

• explicitly set the associated CMake Policy CMP0167 to OLD
  • This policy is deprecated and might be removed entirely in the future
  • We went with this solution for compatibility (see also disable cmake policy that removes FindBoost.cmake PowerGridModel/power-grid-model#873)
• or migrate to libboost-devel
  • This is much larger and contains many unnecessary binaries.

It would be great if we could have a libboost-headers-devel (or similar), that's compatible with both the most recent CMake policy and the smaller dependency size.

I am willing to contribute myself if needed.