Re: [boost] OK to remove Concept related config macros?

Subject: Re: [boost] OK to remove Concept related config macros?
From: John Maddock (boost.regex_at_[hidden])
Date: 2011-03-16 14:33:28

>/home/hunold/src/devel/boost/boost/type_traits/common_type.hpp:70:22: 
>warning:
>variadic templates only available with -std=c++0x or -std=gnu++0x
>/home/hunold/src/devel/boost/boost/type_traits/common_type.hpp:150:46:
>warning: variadic templates only available with -std=c++0x or -std=gnu++0x
>
>as soon as TypeTraits are used.
>This ist gcc-4.5, gcc-4.4 and gcc-4.6 (Mingw)

OK here's the lowdown:

GCC *does* support a number of C++0x features in non-C++0x mode, including 
variadic templates... that's because these features are used within the std 
lib.... but... gcc emits copious warnings if you use these features without 
turning off all warnings from the header that uses them with #pragma 
system_header.  This also causes some of the type_traits tests to fail 
because they're run with warnings-as-errors.  Oh and there's no way to 
selectively turn these warnings off, or to selectively turn them into errors 
:-(

So.... what I think I'll do, is disable those features again, and code the 
tests to emit a #error in non-C++0x mode.

John.