> On Fri, Mar 29, 2013 at 09:44:05PM +0100, Daniel Cegiełka wrote:
> > Is it possible to add to the features.h __MUSL__ definition?
> > 
> > glibc can be identified by __GLIBC__, uclibc through __UCLIBC__ etc.
> 
> Is this question in the FAQ yet? If not, it really should be. The
> answer is no, it won't be added, because it's a bug to assume a
> certain implementation has particular properties rather than testing.

That is a beautiful theory in an ideal world, but in the real world,

implementations have bugs, and sometimes we need to workaround these bugs.

(e.g. the FD* issue reported by Martin Galvan).

So when writing code that should work with different implementations, these

macros are needed to apply workarounds for implementation-specific bugs.

That's why all the rest of the C lib implementations do provide an identifying

macro, something that I think musl should also do, IMVHO.

    Daniel.

> So far, every time somebody's asked for this with a particular usage
> case in mind, the usage case was badly wrong, and would have broken
> support for the next release of musl...
> 
> Rich