[Bug 278271] Bug in LLVM's libc++ breaks g++13 (build of math/ceres-solver is broken on armv7)

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=278271

--- Comment #2 from Dimitry Andric <dim@FreeBSD.org> ---
Reading that upstream comment "[GCC type traits builtins] have been added
recently to GCC without support for mangling", the question is: how recent is
that? I.e. which version of gcc?

I see that in https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114652 you were
using gcc13 which is now the ports default, but I would expect older versions
to still fall over?

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