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Date: Mon, 17 Apr 2017 13:02:08 -0400
From: Rich Felker <>
Subject: Re: superfluous space char in marco

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 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.


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