root_base pin inconsistent with c_compiler_version/cxx_compiler_version

[HLinde]

Comment:

I'm not quite sure were exactly to ask about this, sorry if this is the wrong place!
I'm trying to build a package that depends on CERN's ROOT package.
The package is pinned in conda_build_config.yaml like this:

root_base:
  - 6.32.10
  - 6.34.4

However root_base 6.32.10 depends on c_compiler_version/cxx_compiler_version 13
But those two are pinned to 14.
So the docker build lists variants that are not possible to build and fails.
I did now pin manually to root_base 6.34.4 in my build, but I guess the conda_build_config.yaml here is expected to be consistent, or not?

[h-vetinari]

Root versions are based on a specific clang version, which is something we cannot change. As root introduces new versions, their compatible clang version also changes.

In case you run into conflicts, the easiest is to override the compiler version in your local recipe/conda_build_config.yaml:

c_compiler_version:    # [osx]
  - 18                 # [osx]
cxx_compiler_version:  # [osx]
  - 18                 # [osx]

(18 is just an example here, use whatever root needs.)

Also, you might want to try copying the latest root migrator under .ci_support/migrations and then rerender, to get the newest root versions.