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From: Nick Bowler <nbowler AT draconx DOT ca>
Newsgroups: comp.os.msdos.djgpp,comp.std.c
Subject: Re: DJGPP v2.05: some thoughts
Date: Fri, 5 Jun 2015 20:19:57 +0000 (UTC)
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[cross-posting this to comp.std.c for comments]

On Fri, 05 Jun 2015 22:01:11 +0300, Eli Zaretskii (eliz AT gnu DOT org) wrote:
>> From: Nick Bowler <nbowler AT draconx DOT ca>
>> Names starting with E followed by a digit or an uppercase letter are
>> reserved if <errno.h> is included.
> 
> I don't see this text in the standard.

It was not a quote from the standard.

>> 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.
>> 
>> This text was copied unchanged into C11.  I am quite sure it was also
>> present in C89.
> 
> 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.  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.