GNU bug report logs - #23640
25.1.50; Getting rid of compiler warnings

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From: Ken Brown <kbrown <at> cornell.edu>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 23640 <at> debbugs.gnu.org, Andy Moreton <andrewjmoreton <at> gmail.com>
Subject: bug#23640: 25.1.50; Getting rid of compiler warnings
Date: Sun, 29 May 2016 18:43:48 -0400

On 5/28/2016 5:47 PM, Ken Brown wrote:
> On 5/28/2016 2:57 PM, Eli Zaretskii wrote:
>> emacs_abort is declared with _Noreturn, so how come GCC doesn't shut
>> up about "unreachable" code?
>
> It looks like the problem is the definition of _Noreturn as a macro in
> config.h.  I'll have to figure out what's going on.

That guess was wrong.  The problem turns out to be that lint is defined 
in config.h.  When lint is defined, Cygwin's <sys/cdefs.h> defines 
_Noreturn to be a macro with empty expansion.  I've raised the question 
on the Cygwin list 
(https://www.cygwin.com/ml/cygwin/2016-05/msg00374.html) as to whether 
that's a bug.

Ken

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