thisisnic commented on issue #48912:
URL: https://github.com/apache/arrow/issues/48912#issuecomment-3781298640
@jonkeane Did some digging but very much 🤖 powered so can you confirm if
this sounds right to you?
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I investigated the buildkite logs comparing build 305 (last passing) and
build 306 (first failing, which included the C++20 PR).
Both builds use the same R version (4.5.2) and compiler (conda-forge gcc
14.3.0), which supports C++20. However, conda-forge's R build only has CXX17
configured in its Makeconf, not CXX20.
Arrow's configure script checks R CMD config CXX20 which returns empty
because conda-forge's R wasn't configured with CXX20 support - even though the
underlying compiler supports it.
This looks like a conda-forge r-base packaging issue rather than something
we can fix in arrow-benchmarks-ci. Their R recipe needs to ensure CXX20 is
configured when built with a C++20-capable compiler.
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