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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>
From:	cyg Simple <cygsimple AT gmail DOT com>
Message-ID:	<a4f02950-0178-4a83-482d-03452958e0a9@gmail.com>
Date:	Tue, 1 Nov 2016 22:29:28 -0400
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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.

-- 
cyg Simple

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