[Boost-build] [preprocessor] PR decision for Intel C++ 17 on up on Windows

Subject: [Boost-build] [preprocessor] PR decision for Intel C++ 17 on up on Windows
From: Edward Diener (eldiener_at_[hidden])
Date: 2016-10-27 16:07:30

I need some guidance from Boost developers in general.

A PR has been issued for Boost PP which only affects Intel C++ 17 on up 
in Windows. I can ascertain that only this compiler in Windows is 
affectd by the PR. Needless to say I do not test this personally because 
it costs a decent amount of money to buy a license. Intel does 
graciously offer free licenses for Intel C++ on Linux for Boost 
developers and I have used it to test the compiler under Linux. Also 
there are no regression tests for Intel C++ on Windows in the 'develop' 
or 'master' regression test matrices.

While the person who issued the PR ascertains that it fixes problems for 
Boost libraries he uses with Intel C++ 17 on Windows the nature of the 
PR is drastic enough that it could easily break other libraries if the 
changes in the PR does not correspond to Intel C++ preprocessing in all 
cases. So my quandary is what to do about the PR.

The PR is at
https://github.com/boostorg/preprocessor/pull/9#issuecomment-256741882. 
It is another one of these cases, like clang targeting VC++, where a 
compiler implementation on Windows wants to emulate the non-standard 
VC++ preprocessor but can't quite get it right ( as if emulating a 
broken preprocessor should ever be right ).

Thoughts ? Ideas ? Suggestions ?