All programs compiled with DMD or LDC, including DMD itself, will fail to run on the latest version of macOS, Catalina (10.15), which is available as a public beta.

For more details see [1]. I have created a PR [2] to fix this. Hopefully it will be included in the next release of DMD.

[1] https://issues.dlang.org/show_bug.cgi?id=20019
[2] https://github.com/dlang/druntime/pull/2666

-- 
/Jacob Carlborg

On 2019-07-07 12:18, Jacob Carlborg wrote:
> All programs compiled with DMD or LDC, including DMD itself, will fail to run on the latest version of macOS, Catalina (10.15), which is available as a public beta.
> 
> For more details see [1]. I have created a PR [2] to fix this. Hopefully it will be included in the next release of DMD.
> 
> [1] https://issues.dlang.org/show_bug.cgi?id=20019
> [2] https://github.com/dlang/druntime/pull/2666

Also, to clarify. When this fix has been merged. All D programs need to be recompiled with a version of druntime including this fix to be able to run on macOS Catalina. The fix is backwards compatible and works with all version of macOS that D supports.

-- 
/Jacob Carlborg

On Sunday, 7 July 2019 at 10:18:09 UTC, Jacob Carlborg wrote:
> All programs compiled with DMD or LDC, including DMD itself, will fail to run on the latest version of macOS, Catalina (10.15), which is available as a public beta.
>
> For more details see [1]. I have created a PR [2] to fix this. Hopefully it will be included in the next release of DMD.
>
> [1] https://issues.dlang.org/show_bug.cgi?id=20019
> [2] https://github.com/dlang/druntime/pull/2666

Ouch! Great catch yo!

And thanks for the heads up.