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Teaching emacs about GCC coding conventions (was Re: [PATCH] tree_code_name wrapper)

On Tue, 2013-10-15 at 13:19 +0000, Paulo Matos wrote:
> > -----Original Message-----
> > From: Jakub Jelinek []
> > Sent: 15 October 2013 10:51
> > To: Paulo Matos
> > Cc: Richard Biener; Paolo Carlini;
> > Subject: Re: [PATCH] tree_code_name wrapper
> > 
> > On Tue, Oct 15, 2013 at 09:42:17AM +0000, Paulo Matos wrote:
> > > Thanks, regarding the indentation I was convinced we used 2 space
> > > indentation with maximum line length of 80 characters.
> > 
> > We do, however 8 consecutive spaces in the indentation should be always
> > replaced by a tab.
> > 
> This means that every sequence of 8 spaces should be converted into tabs? So, if we indent something 4 times, that becomes a tab instead of 4 times 2 spaces. 
> Just to confirm so I can setup my emacs to use this.

Probably a silly question, but what's the invocation in emacs to do
this, and is it possible to set up the source tree so that this happens
automatically for everyone?

(I've been using whitespace-mode and manually copying-and-pasting tab
characters, which is clearly suboptimal).

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