Re: sys/cdefs.h or maybe gcc build issue

[cyg Simple <cygsimple at gmail dot com>]

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

--
Problem reports:       http://cygwin.com/problems.html
FAQ:                   http://cygwin.com/faq/
Documentation:         http://cygwin.com/docs.html
Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple