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Date: Fri, 05 Jun 2015 22:03:08 +0300
From: "Eli Zaretskii (eliz AT gnu DOT org)" <djgpp AT delorie DOT com>
Subject: Re: DJGPP v2.05: some thoughts
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> From: Hans-Bernhard Bröker <HBBroeker AT t-online DOT de>
> Date: Fri, 05 Jun 2015 20:08:19 +0200
> 
> Am 05.06.2015 um 16:16 schrieb Eli Zaretskii (eliz AT gnu DOT org):
> >> From: Martin Str|mberg <ams AT ludd DOT luth DOT se>
> >> Date: Fri, 5 Jun 2015 12:29:43 +0000 (UTC)
> >>
> >> But, IIRC, C99 (or even perhaps C89) reserved any symbol starting with E.
> >
> > Where do you see such language in C99?  I don't see it, and neither do
> > I see it in C11.  But maybe I'm missing something, it's not like I've
> > read the entire document top to bottom.
> 
> This passage might be read that way (C99 7.5 <errno.h>, paragraph 4):
> 
> 	Additional macro definitions, beginning with E and a digit
> 	or E and an uppercase letter, may also be specified by the
> 	implementation.
> 
> This has a footnote pointing to C99 7.26.3 ("Future library directions", 
> <errno.h>), which reads:
> 
> 	Macros that begin with E and a digit or E and an uppercase
> 	letter may be added to the declarations in the <errno.h>
> 	header.
> 
> I.e. the standard reserves other E* macros for itself, to be used in 
> future versions.  AIUI, that doesn't actually reserve them for use by 
> DJGPP, though.

Indeed, it doesn't, IMO.

I think we should stick to the old practice of not defining
non-standard values when strict standard compliance was requested by
the compiler switches.