18643, "mppf", "Problems building Chapel with system LLVM with libcxx or compiler-rt", "2021-10-28T20:02:09Z"
Split-off from #18589 and in particular Unable to build Chapel 1.25.0 under Gentoo Linux with CHPL_LLVM=system · Issue #18589 · chapel-lang/chapel · GitHub .
When Chapel is built with
CHPL_LLVM=system, that assumes that the system LLVM does not default to libcxx or compiler-rt. If it does, there appear to be build failures, at least on Gentoo. See the comment above for instructions to reproduce there.