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To: "cygwin AT cygwin DOT com" <cygwin AT cygwin DOT com>,
        Mark Liam Brown
 <brownmarkliam AT gmail DOT com>
Subject: Re: [EXTERNAL] Building Cygwin/ARM64, and ARM64 port of Cygwin status?
Thread-Topic: [EXTERNAL] Building Cygwin/ARM64, and ARM64 port of Cygwin
 status?
Thread-Index: AQHb+r6bw/1FKqwHpE6Jrq4aT/gk2rQ9w4HHgAU/CICAAEMcFQ==
Date: Fri, 25 Jul 2025 19:59:10 +0000
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From: Radek Barton via Cygwin <cygwin AT cygwin DOT com>
Reply-To: Radek Barton <radek DOT barton AT microsoft DOT com>
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Sender: "Cygwin" <cygwin-bounces~archive-cygwin=delorie DOT com AT cygwin DOT com>

Hello.

> Did you benchmark WHY it takes so long?

Not really but in general creating Cygwin/MSYS2 processes on Windows (even x64 on x64) has its costs and GNU tools are heavily utilizing creation of overload of short-living processes. Plus there is a cost of x64 emulation on Arm64 which is around 30%.

> Do you have any prototype binaries?

You can download Ubuntu cross-compilation toolchain binaries from releases at https://github.com/Windows-on-ARM-Experiments/mingw-woarm64-build/releases and Windows x64 to Arm64 cross-compilation toolchain binaries from releases at https://github.com/Windows-on-ARM-Experiments/newlib-cygwin/releases

Radek

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