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From: Rich Felker <dalias@libc.org>
To: musl@lists.openwall.com
Subject: Re: superfluous space char in marco
Date: Mon, 17 Apr 2017 13:02:08 -0400	[thread overview]
Message-ID: <20170417170208.GA17319@brightrain.aerifal.cx> (raw)
In-Reply-To: <alpine.LNX.2.20.13.1704171825470.26181@monopod.intra.ispras.ru>

On Mon, Apr 17, 2017 at 06:28:58PM +0300, Alexander Monakov wrote:
> On Mon, 17 Apr 2017, Rich Felker wrote:
> > This is odd and looks like a gcc bug. Preprocessor macros definitions
> > are sequences of PP tokens, not literal code strings, meaning that
> > whitespace is irrelevant as long as the resulting sequence of PP
> > tokens remains the same; it's a matching definition not a
> > redefinition.
> 
> No, according to C11 6.10.3 p1 presence of whitespace is significant (its
> contents are not), and 6.10.3.5 example 6 corroborates that.  GCC, Clang,
> ICC and MSVC on Godbolt all agree with that.

Thanks for clarifying! I had forgotten this detail. It probably makes
sense to change it, then.

Rich


  reply	other threads:[~2017-04-17 17:02 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-04-16  7:58 Syrone Wong
2017-04-17 14:48 ` Rich Felker
2017-04-17 15:28   ` Alexander Monakov
2017-04-17 17:02     ` Rich Felker [this message]
2017-04-17 17:29       ` Szabolcs Nagy
2017-04-17 17:35         ` Rich Felker

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