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Subject: Re: sys/cdefs.h or maybe gcc build issue
To: cygwin AT cygwin DOT com
References: <57cbf5e2-f37b-ae50-f65c-dd6782481962 AT gmail DOT com> <6ecdfff0-9f53-9cd6-9934-6237c153ea7b AT cornell DOT edu> <a4f02950-0178-4a83-482d-03452958e0a9 AT gmail DOT com> <20161108151701 DOT GB31855 AT calimero DOT vinschen DOT de>
From: cyg Simple <cygsimple AT gmail DOT com>
Message-ID: <d79e2ea5-759c-9bd0-ddeb-5c33a2243f84@gmail.com>
Date: Tue, 8 Nov 2016 21:09:45 -0500
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On 11/8/2016 10:17 AM, Corinna Vinschen wrote:
> On Nov  1 22:29, cyg Simple wrote:
>> On 11/1/2016 3:42 PM, Ken Brown wrote:
>>> On 10/30/2016 2:23 PM, cyg Simple wrote:
>>>> The below sample code will give a warning that visibility isn't
>>>> supported in this configuration.  Either the GCC build is incorrect or
>>>> the sys/cdefs.h needs to be modified to define __hidden to empty.
>>>>
>>>> /********************************************/
>>>> #include <sys/cdefs.h>
>>>> #include <stdio.h>
>>>>
>>>> __hidden void hello (char * str) {
>>>>     printf("%s %s\n", "Hello", str);
>>>> }
>>>>
>>>> int main (int argc, char ** argv) {
>>>>     hello("cruel world!");
>>>> }
>>>> /********************************************/
>>>
>>> If you're trying to write portable code, why would you assume that
>>> __hidden is defined?  It's not defined in glibc, for example, and your
>>> sample program doesn't compile on Linux:
>>>
>>> $ gcc test.c
>>> test.c:4: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before
>>> ‘void’
>>>
>>> Do you have a real use case where this issue came up?  The sample isn't
>>> very convincing as it stands.
>>
>> I don't in the real case sense but in Cygwin __hidden is defined.  And
>> obviously it is incorrectly defined in _YOUR_ Linux.  If the visibility
>> attribute isn't supported by the GCC compiler these helper macros
>> shouldn't be defined as if they were.
> 
> Fixed in the repo.
> 

Thanks, in a few months I can remove my #ifdef __CYGWIN__ to #undef and
#define it.

-- 
cyg Simple

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