config/mingw/Makefile MinGW64 bug ?

[Tatsuro M. <tma...@ya...>]

Bastian

2016-08-08  Bastian Maerkisch  <bma...@we...>

    * config/mingw/Makefile:  Avoid warning messages when using clang.
    Omit C++ flags when building gp_cairo.c.  Japanese help file was
    missing a graph from the demos.  Execute lua via the cmd.exe shell
    in order to avoid errors when redirecting its output (Seems to be
    a lua bug in Mingw64).

The lua build using MinGW64 on the sourceforge site (gcc-5.3.0) does not have this bug.
Perhaps this is a bug on mingw64 on the msys2.
If you have a chance, please correct the description.


Tatsuro