thisisnic commented on PR #48974:
URL: https://github.com/apache/arrow/pull/48974#issuecomment-3795071973
I did some more digging with :robot: and ended up here @jonkeane - I spent
some time asking questions and getting verification from code, so it's a bit
over my head, so let me know if this sounds feasible to you!
> Problem: conda-forge builds R with gcc 10, which has incomplete C++20
support. R's configure tests for C++20, fails, and leaves CXX20 empty in
Makeconf. Even though benchmark machines install gcc 14.3.0 via the compilers
package, R doesn't know to use it for C++20.
>
> Our fix: Check if R CMD config CXX20 returns empty, and if so, append
CXX20 settings to Makeconf pointing to g++ (which resolves to gcc 14.3.0 in the
conda environment).
>
> Why it works: The compiler is there and capable - R's Makeconf just
wasn't configured to use it. Our patch fills in that missing config.
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