X-Recipient: archive-cygwin AT delorie DOT com
DomainKey-Signature: a=rsa-sha1; c=nofws; d=sourceware.org; h=list-id
	:list-unsubscribe:list-subscribe:list-archive:list-post
	:list-help:sender:subject:references:to:from:reply-to:message-id
	:date:mime-version:in-reply-to:content-type
	:content-transfer-encoding; q=dns; s=default; b=Aoj1PVWt92c2ig99
	4JNXfGqWyT0V+d0LKqHIzIHgS5ucih7ENYfLbMGN252JhCWX/cyDw6z9iAWsGnyt
	zIPSE5azBl4DUdYLUKO02riHCCGhveYScsEIv3p/7pkycTBN0rS/+u29Ew6s7iXH
	BR8hycLMiq+r6CF559CBu7r3ZAc=
DKIM-Signature: v=1; a=rsa-sha1; c=relaxed; d=sourceware.org; h=list-id
	:list-unsubscribe:list-subscribe:list-archive:list-post
	:list-help:sender:subject:references:to:from:reply-to:message-id
	:date:mime-version:in-reply-to:content-type
	:content-transfer-encoding; s=default; bh=YvaMmzyK43nwGaKyPOZSrl
	XaorI=; b=OdOlyHuPQHj8j7AkXwDzzS0lXp0zuhoVFXpNVfzLhd6AYvp88zLVQa
	99N9mfT0KdPj3RPKX4CK2DXagQexBwrJongcBJm7420MZe8139fL/lxy5nu1N8pC
	aJHOPyG1fnPDFJ8yQlXPmWYa3zSLrw6gM4t7SBoVtqo6bBDZCpaSg=
Mailing-List: contact cygwin-help AT cygwin DOT com; run by ezmlm
List-Id: <cygwin.cygwin.com>
List-Subscribe: <mailto:cygwin-subscribe AT cygwin DOT com>
List-Archive: <http://sourceware.org/ml/cygwin/>
List-Post: <mailto:cygwin AT cygwin DOT com>
List-Help: <mailto:cygwin-help AT cygwin DOT com>, <http://sourceware.org/ml/#faqs>
Sender: cygwin-owner AT cygwin DOT com
Mail-Followup-To: cygwin AT cygwin DOT com
Delivered-To: mailing list cygwin AT cygwin DOT com
Authentication-Results: sourceware.org; auth=none
X-Virus-Found: No
X-Spam-SWARE-Status: No, score=0.4 required=5.0 tests=AWL,BAYES_40,KAM_LAZY_DOMAIN_SECURITY,RCVD_IN_DNSWL_LOW autolearn=no version=3.3.2 spammy=iot, Surface, Hx-spam-relays-external:64.59.136.139, H*RU:64.59.136.139
X-HELO: smtp-out-so.shaw.ca
X-Authority-Analysis: v=2.2 cv=SPoybKnH c=1 sm=1 tr=0 a=WqCeCkldcEjBO3QZneQsCg==:117 a=WqCeCkldcEjBO3QZneQsCg==:17 a=IkcTkHD0fZMA:10 a=w_pzkKWiAAAA:8 a=mDV3o1hIAAAA:8 a=w5aJ8kaLLAry8Qfnm_kA:9 a=QEXdDO2ut3YA:10 a=9_CB3tsf_QYA:10 a=RLeWZs9yk0EA:10 a=sRI3_1zDfAgwuvI8zelB:22 a=_FVE-zBwftR9WsbkzFJk:22
Subject: Re: sys/cdefs.h or maybe gcc build issue
References: <57cbf5e2-f37b-ae50-f65c-dd6782481962 AT gmail DOT com>
To: cygwin AT cygwin DOT com
From: Brian Inglis <Brian DOT Inglis AT SystematicSw DOT ab DOT ca>
Reply-To: Brian DOT Inglis AT SystematicSw DOT ab DOT ca
Message-ID: <b9a26d6c-6c17-7486-4abb-fcfbf8915c09@SystematicSw.ab.ca>
Date: Sun, 30 Oct 2016 15:09:23 -0600
User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:45.0) Gecko/20100101 Thunderbird/45.4.0
MIME-Version: 1.0
In-Reply-To: <57cbf5e2-f37b-ae50-f65c-dd6782481962@gmail.com>
Content-Type: text/plain; charset=utf-8; format=flowed
Content-Transfer-Encoding: 7bit
X-CMAE-Envelope: MS4wfGilpOu/XYjUzV0PnDRyxPA99j1PpGyL07E07V0Ah4m9ef98tkXxpi6b/82hYkNC0gjFZejLVPQedaFTysbomnwsNBhsEYuNFnm3D6/JB/tlVQ62+wvF Ceu0Ur+9RxSMcZd+aRC/Czkbo8YHeH67brFU2RuJpydgYN7gm2USWJ8KsR6e6+0YJm5m4beY9AYV0A==
X-IsSubscribed: yes

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

--
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