[cfe-dev] clang-cl error on building simple cpp with only windows.h + boost-mutex included

[Dennis Luehring via cfe-dev]

Am 11.02.2016 um 06:38 schrieb Yaron Keren:
> Try -DBOOST_USE_WINDOWS_H
> -DBOOST_SP_USE_STD_ATOMIC may also be needed.

adding

-DBOOST_USE_WINDOWS_H

let me compile the cpp

is clang-cl not "compatible" enough so boost is not detecting MSVC 
correct or why doesn't cl need this?