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Subject: Re: Clang is using the wrong memory model
To: cygwin AT cygwin DOT com
References: <732305300 DOT 268416262 DOT 1565603129541 DOT JavaMail DOT root AT zimbra54-e10 DOT priv DOT proxad DOT net> <024ce5b5-6024-b371-e382-5eef5d1d4a90 AT agner DOT org> <075477ca-e031-39ea-3dfe-bc8bc2fc8fa6 AT agner DOT org> <20190816082603 DOT GR11632 AT calimero DOT vinschen DOT de> <8d594f4d-17e0-447a-8b18-1ed620815e0f AT agner DOT org> <20190816095200 DOT GU11632 AT calimero DOT vinschen DOT de>
From: Agner Fog <agner AT agner DOT org>
Message-ID: <2024f551-66e6-47c5-a0b6-2dfa735a690d@agner.org>
Date: Fri, 16 Aug 2019 12:38:57 +0200
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On 16/08/2019 11.52, Corinna Vinschen wrote:
> 2 GB. Think errno accessed from another DLL. Your application works 
> only by chance.

Good example.

errno appears to be a global variable for historical reasons, but errno 
is implemented as a macro that translates to a call to the imported 
function __errno.

This function call goes through a 64-bit import table from cygwin1.dll

Works fine with -mcmodel=small

Static sharing of a global variable between exe and dll, or between 
different dll's is not possible.



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