LLVM 6.0.1p8 fails to compile on 6.4-stable/loongson

[Xiyue Deng]

Hi,

As title says.  LLVM 6.0.1p8 build fails due to missing header files.
The most relevant outputs:

#+BEGIN_QUOTE
In file included from 
/usr/ports/pobj/llvm-6.0.1/llvm-6.0.1.src/tools/lldb/source/Interpreter/CommandInterpreter.cpp:53:0:
/usr/ports/pobj/llvm-6.0.1/llvm-6.0.1.src/tools/lldb/include/lldb/Host/Editline.h:49:19:
 fatal error: codecvt: No such file or directory
 #include <codecvt>
                   ^
compilation terminated.
ninja: build stopped: subcommand failed.
#+END_QUOTE

The full build log is also attached.  Please advice on how to fix or debug.

Thanks.

-- 
manphiz

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