what is _XOPEN_SOURCE=500 needed for?

[Daniel Stone]

On Wed, May 25, 2005 at 05:35:04PM -0400, Soeren Sandmann wrote:
> Daniel Stone wrote:
> >So, at a guess, we do something like this:
> >x11proto.pc.in: Cflags: $(FDBITSFLAGS)
> > 
> >
> I basically agree that this is right.
> 
> The other possibility is to add a new installed header file, called 
> something like
> Xproto-config.h, then conditionally include that in all public headers. 

You may still get system headers including <sys/select.h> first; it's by
no means a given that it'll work if you define it in a header.

> One of the advantages of auto* over imake is that it has the ability to 
> detect at compile-time
> what flags are needed. If possible using that feature is better than 
> just magically
> asserting that "_XOPEN_SOURCE is needed on Linux". So I prefer something 
> like
> the following instead:
> [...]

That is, indeed, far nicer.
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