From: Jeff King <peff@peff.net>
Date: Thu, 09 Jun 2011 05:52:24 GMT
Subject: Re: [PATCH 1/2] Remove noreturn function pointers in usage.c
Message-ID: <20110609055224.GA27780@sigill.intra.peff.net>
In-Reply-To: <20110609045915.GA15448@one.firstfloor.org>

On Thu, Jun 09, 2011 at 06:59:15AM +0200, Andi Kleen wrote:

> >  - Potential impact to people who do not use Gcc 4.6 with profile feedback
> >    is not explained away well, except for "Doesn't seem to make any
> >    difference."
> 
> I merely went by "there are no new warnings" (I assume that's the main
> motivation)

On your compiler and settings, perhaps. With your patch I get:

  usage.c: In function ‘die’:
  usage.c:70:1: error: ‘noreturn’ function does return [-Werror]

And rightfully so:

void NORETURN die(const char *err, ...)
{
        va_list params;

        va_start(params, err);
        die_routine(err, params);
        va_end(params);
}

You've stripped the NORETURN from die_routine, so of course it looks like we
end up returning.

This is with:

  $ gcc --version | head -n 1
  gcc (Debian 4.6.0-11) 4.6.1 20110604 (prerelease)

-Peff