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From: Simon Wright <simon@pushface.org>
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Subject: Re: Exceptions Not Working Under High Sierra
Date: Sun, 23 Oct 2022 07:33:58 +0100
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Roger Mc <rogermcm2@gmail.com> writes:

> OSX 10.13.6
> Xcode 10.1
> GNAT Community 2021 (20210519)
>
> On my MacBook Air which is restricted to OSX 10.13.6 Ada Exceptions produce 
> Execution terminated by abort of environment task
> instead of the standard exception message
> I reinstalled Command Line Tools but this didn't improve matters.
>
> Any advice on overcoming this problem will be appreciated.

Does your project by any chance involve C++? I had problems related to
clang++ vs g++ which I wrote up here:
https://forward-in-code.blogspot.com/2022/03/gnat-llvm.html