[Bug 294900] Errors during buildworld: C++20 extension

From: <bugzilla-noreply_at_freebsd.org>
Date: Fri, 15 May 2026 07:56:44 UTC
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=294900

--- Comment #11 from Benjamin Jacobs <freebsd@dev.thsi.be> ---
You seem to have the non-default WITHOUT_CLANG_BOOTSTRAP set, hence it is
trying to use the system CC (clang-19) with the llvm21 sysroot & includes from
/usr/obj (see bsd.sys.mk, bsd.compat.mk). This is likely unsupported.

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