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Subject: Re: sys/cdefs.h or maybe gcc build issue
References: <57cbf5e2-f37b-ae50-f65c-dd6782481962@gmail.com>
To: cygwin@cygwin.com
From: Brian Inglis <Brian.Inglis@SystematicSw.ab.ca>
Reply-To: Brian.Inglis@SystematicSw.ab.ca
Message-ID: <b9a26d6c-6c17-7486-4abb-fcfbf8915c09@SystematicSw.ab.ca>
Date: Sun, 30 Oct 2016 15:09:23 -0600
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On 2016-10-30 12:23, 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.

https://cygwin.com/ml/cygwin/2005-08/msg01057.html

gcc wiki demonstrates what needs to be done instead:

https://gcc.gnu.org/wiki/Visibility#line-76

at a minimum add `&& !define(__CYGWIN__)`; other posts also exclude
MinGW and ARM-PE (W10 Surface, IoT) targets using PE format not ELF;
gcc notes not all ELF targets support this:
  
https://gcc.gnu.org/onlinedocs/gcc-3.3.5/gcc/Function-Attributes.html#index-_0040code_007bvisibility_007d-attribute-1624

Which raises the interesting question - anyone tried porting Cygwin
to non-x86 arch?

-- 
Take care. Thanks, Brian Inglis, Calgary, Alberta, Canada

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