Re: [boost] [clang] How to use CLang for Windows?

On 9/29/2013 9:13 PM, Beman Dawes wrote:

On Sun, Sep 29, 2013 at 8:36 PM, Edward Diener wrote:

...

There are other cases in the Boost header files that assume that when _MSC_VER is defined the compiler is VC++ ( see my thread "Boost and clang under Windows" ) without checking if it could be another compiler emulating VC++.

But that is a mistake. BOOST_MSVC has been the preferred macro to check for VC++ since September of 2001. Since even before then there have been non-Microsoft compilers that define _MSC_VER.

The Boost PP config.h file was created by Paul Mensonides. Boost PP does not use the Boost.Config library or any other Boost library, so using BOOST_MSVC is not possible. You need to talk to Paul about his reasons and design. I am just trying to "fix" the Boost PP library so that clang on Windows works there. The reality is that a number of other Boost libraries use _MSC_VER instead of BOOST_MSVC in order to check for VC++ emulation. In some of those other libraries further checks are done to detect which actual compiler is using _MSC_VER and different code is often invoked in that case. But naturally there are no further checks for clang, since clang under Windows with _MSC_VER defined is "new".