Customizing error behavior

[Richard (Rikki) Andrew Cattermole]

On 13/09/2025 3:42 AM, Sönke Ludwig wrote:
> Is there any way to customize the behavior of the various `Error`s 
> generated by Druntime? On Windows it's possible to redefine the error 
> functions, such as onOutOfMemoryError or onRangeError, in your 
> executable to let them override the ones defined in Druntime. However, 
> on other systems that just leads to a duplicate symbol linker error.
> 
> The reason I'd like to modify the behavior is twofold:
> 
> - The output to `stderr` is lost in our setup (GUI application)
> - The point of failure after an error was thrown inside of a fiber 
> (vibe.d task) is not the place where it was raised, but the place where 
> it was caught (at a subsequent `abort()` call)
> 
> If there is currently no way, could those symbols be changed to weak 
> linkage to enable the Windows approach on other platforms?

And below:

https://github.com/dlang/dmd/blob/master/druntime/src/core/exception.d#L546