Override assert handler

[Johan]

On Sunday, 18 August 2024 at 17:22:44 UTC, Richard (Rikki) Andrew 
Cattermole wrote:
> On 18/08/2024 1:53 PM, Walter Bright wrote:
>> Allow me to explain how a library works.
>> 
>> The linker resolves all the symbols in the object files given 
>> to it. When there are references to symbols, but no symbols, 
>> then (and only then) does the linker consult the library. The 
>> linker will pull in modules from the library that export those 
>> missing symbols.
>> 
>> Therefore, the easiest way to override a function that's in 
>> the library is to write your own and put it in the list of 
>> object files for the linker to incorporate.
>
> This needs some context.
>
> It only applies to object files and executables, the moment 
> shared libraries enter the picture (such as druntime) this no 
> longer is the full story.

And there is of course inlining that needs to be disabled for an 
"overridable" function. @weak does that too.

-Johan