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Subject: Re: lint kills _Noreturn
To: cygwin AT cygwin DOT com
References: <6fef0097-c076-2691-c4f9-2af5a050a17e AT cornell DOT edu> <86fut07qha DOT fsf AT gmail DOT com>
From: Ken Brown <kbrown AT cornell DOT edu>
Message-ID: <9c66686a-0af8-dbfe-7804-797df8aad7c6@cornell.edu>
Date: Sun, 29 May 2016 13:21:44 -0400
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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.

> 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.

Ken


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