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Subject: Re: Inefficient use of 64-bit addresses in Clang
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>
From: Agner Fog <agner AT agner DOT org>
Message-ID: <024ce5b5-6024-b371-e382-5eef5d1d4a90@agner.org>
Date: Wed, 14 Aug 2019 07:51:02 +0200
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It's a difference in memory model.

clang 6.0.0 under ubuntu with --target=x86_64-pc-cygwin gives relative 
addresses, unless you specify -mcmodel=large.

Cygwin clang with -mcmodel=small does the right thing: use relative 
addresses.

The -mcmodel=small option appears to work differently for Linux and for 
Windows targets. I cannot find any documentation of this difference. See:

https://bugs.llvm.org/show_bug.cgi?id=42983


On 12/08/2019 11.45, falk DOT tannhauser AT free DOT fr wrote:
> References: <578eb489-9391-9009-82ad-676eeb4c1c92 AT agner DOT org>
> In-Reply-To: <578eb489-9391-9009-82ad-676eeb4c1c92 AT agner DOT org>
>
> Could the different behaviour between Cygwin and Linux simply be due to different Clang versions?
> The current version under Cygwin is 5.0.1, while the latest version available under Linux
> appears to be 8.0.1 .
>
> Falk
>
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