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To:	cygwin AT cygwin DOT com
From:	Andy Moreton <andrewjmoreton AT gmail DOT com>
Subject:	Re: lint kills _Noreturn
Date:	Sun, 29 May 2016 20:09:07 +0100
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References:	<6fef0097-c076-2691-c4f9-2af5a050a17e AT cornell DOT edu> <86fut07qha DOT fsf AT gmail DOT com> <9c66686a-0af8-dbfe-7804-797df8aad7c6 AT cornell DOT edu>
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On Sun 29 May 2016, Ken Brown wrote:

> On 5/29/2016 12:56 PM, Andy Moreton wrote:
>> On Sun 29 May 2016, Ken Brown wrote:
>>
>>> If lint is defined, then /usr/include/sys/cdefs.h defines _Noreturn as a macro
>>> that expands to nothing.  Is this intentional?
>>>
>>> Simple test case:
>>>
>>> $ cat test.h
>>> #define lint 1
>>> #include <sys/cdefs.h>
>>> _Noreturn void foo (void);
>>>
>>> $ gcc -E test.h | grep foo
>>>          void foo (void);
>>>
>>>
>>> Ken
>>
>> A traditional lint program may not support the new C11 keywords, but
>> will define the 'lint' symbol. See, e.g.
>>      http://www.unix.com/man-page/FreeBSD/1/lint
>
> But in the present context (see my second message), we're redefining C11
> keywords even though __STDC_VERSION__ >= 201112L.

Agreed, but that should only affect a lint program that understands C11.
Any other program should simply not be defining lint in the first place.

>> Surely the real problem here is a program which is not a lint executable
>> defining 'lint' ?
>
> The program is emacs built from a git checkout of the master branch.  By
> default the configure option --enable-gcc-checking is used, and this causes
> lint to be defined in src/config.h.  It doesn't seem to be a problem on
> platforms other than Cygwin; or at least it hasn't been reported.

I saw your report of emacs bug#23640, and followed here. I think the
real question is why the recent change to emacs configure.ac added a
definition of lint - that seems wrong.

    AndyM


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