Re: [boost] [config] Rethinking feature macros?

Subject: Re: [boost] [config] Rethinking feature macros?
From: Peter Dimov (lists_at_[hidden])
Date: 2017-11-06 16:12:10

Andrey Semashev wrote:

> > You're refuting your own argument, because if g++-15 would need 200 
> > positive macros compared to g++-7's 100, g++-7 would need 100 negative 
> > macros.
>
> g++-7 will be out of wide use by then, so it doesn't matter.

That's not true on at least three levels.

> > The good thing about positive macros is that an old compiler never needs 
> > maintenance. With negative macros you have to keep adding them to it.
>
> That is not more maintenance than adding positive macros for newer 
> compilers.

It is. Maintaining the new compilers is constant regardless of the macro 
type, and maintaining the old compilers is only required for negative 
macros.