Re: superfluous space char in marco

[Rich Felker <dalias@libc.org>]

On Mon, Apr 17, 2017 at 07:29:19PM +0200, Szabolcs Nagy wrote:
> * Rich Felker <dalias@libc.org> [2017-04-17 13:02:08 -0400]:
> > 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.
> 
> linux uapi header has whitespace befor IFF_MASTER
> if we match the definition with something i think
> it should be the linux header not iproute2

Yes, the official Linux one, not iproute2's fork, is what we should
match, if anything.

Rich