sys/cdefs.h or maybe gcc build issue

Corinna Vinschen corinna-cygwin@cygwin.com
Tue Nov 8 15:17:00 GMT 2016


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,
Corinna

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat
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