[llvm-dev] Failed to build libunwind the libcxx's __config header

[Tim Northover via llvm-dev]

Hi Dmitry,

On 2 June 2017 at 07:49, Dmitry Golovin via llvm-dev
<llvm-dev at lists.llvm.org> wrote:
> Does anyone else have this problem? What can possibly cause such error?

G++ doesn't support __has_feature, so it should be picking up the
default "#define __has_feature(__x) 0" further up in __config. The
preprocessed output (via "-E -dD") would be interesting to diagnose
the issue, if no-one else has seen it before.

Cheers.

Tim.