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Re: Emacs master build failing on RHEL 6.8

From: Paul Eggert
Subject: Re: Emacs master build failing on RHEL 6.8
Date: Wed, 8 May 2019 08:57:17 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1

On 5/7/19 11:49 AM, Mattias EngdegÄrd wrote:
> It's always been allowed as far as I know. Perhaps some pre-standard (K&R) 
> preprocessors didn't like it.

That's correct. C89-and-later allows white space (but not comments)
before the leading "#" in a line. K&R C did not.

> It's common in style rules to mandate # at the left margin, but that always 
> looked like superstition (or perverted aesthetics) to me.

Yes, that common style is often hard to read. It exists mostly because
of inertia. For example, by default cc-mode insists on jamming the "#"
on the left and I have been too lazy so far to fix that (at least it
should respect the already-existing style).

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