Hello,

Some time ago it was announced an experimental support for Windows on Aarch64 
(namely in this post 
https://lists.freepascal.org/pipermail/fpc-pascal/2020-April/057762.html). I 
tried to build a dll with a proprietary code for that target. Building 
succeeded but it crashes on loading. At the moment I don't understand how to 
investigate the issue to provide more information about it.

Here is my setup (in case there are any obvious mistakes). I built FPC from 
source (using commit e091d263c84890f64ca8353fa837c4fd7eb94c37). Building on 
Windows was quite straightforward - make OS_TARGET=win64 CPU_TARGET=aarch64 
BINUTILSPREFIX= OPT=-O- all (as it was described in the post above). There was 
one catch though. Since I used MSys I had to make sure that the path to 
existing FPC was earlier than MSys's paths, i.e. I did export 
PATH=/c/tools/FPC/3.2.2/bin/i386-Win32/fpc:$PATH. FPC build system doesn't 
understand MSys file paths which are produced by MSys make, one must use make 
from FPC distribution. After building I got ppcrossa64.exe which is PE32+ 
executable for x86-64 itself. After this I built my dll. The command line was 
roughly like this: /c/tools/FPC/3.3.1/bin/x86_64-win64/ppcrossa64 -O- -Twin64 
-Paarch64 -Sd -CF64 -fPIC -XPaarch64-win64 -olib.dll lib.dpr.

Any help in investigating the crash would be appreciated. Obviously I cannot 
share the proprietary code (it's not mine). However, in case there are any 
tests from the FPC source code that I can build and run on ARM64 I would 
eagerly do it.

Volo.
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