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Subject: Re: DJGPP v2.05: some thoughts
Date: Fri, 05 Jun 2015 23:12:58 +0200
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Am 05.06.2015 um 22:19 schrieb Nick Bowler:
> [cross-posting this to comp.std.c for comments]
[But forgot to implement a F'up2....]

> On Fri, 05 Jun 2015 22:01:11 +0300, Eli Zaretskii (eliz AT gnu DOT org) wrote:

>>> C99§7.5p4 Errors <errno.h>:

>>>    Additional macro definitions, beginning with E and a digit or E and
>>>    an uppercase letter, may also be specified by the implementation.

>> It's indeed present in C89, but I don't see how it reserves these
>> names.
>
> It's reserved for the implementation (DJGPP in this case) because this
> text occurs in a library subclause.

No, it's not.  It says an implementation *may* _define_ additional 
identifiers, but that doesn't _reserve_ those identifiers.

 > You need to go back to the section
> on reserved identifiers.  In particular:
>
> C99§7.1.3p1 Reseverd Identifiers
>
>     ... Each macro name in any of the following subclauses (including
>         the future library directions) is reserved for use as specified
>         if any of its associated headers is included; unless explicitly
>         stated otherwise (see 7.1.4).
>
> This text is also unchanged in C11.

And it doesn't apply to the issue at hand, because none of the 
non-standard errno macros is actually _in_ any of the Library subclauses.