Building for ARM 32-bit embedded

[kinke]

Hey! Seems like you (and ChatGPT) unfortunately haven't found 
https://wiki.dlang.org/Cross-compiling_with_LDC, it would 
hopefully have made the journey a bit easier. But I'm sure you 
learned a lot along the way! :)

Just to show that cross-compiling and -linking can work without 
too much effort too, with a vanilla LDC config and an already 
available C cross-toolchain (admittedly cheating via `-betterC`, 
which doesn't require druntime+Phobos library builds - but we 
have an `ldc-build-runtime` helper to make that easier, see the 
linked Wiki page), also on Ubuntu 24 (but targeting AArch64, as I 
had that cross-toolchain on disk already):
```
$ cat hello.d
import core.stdc.stdio;

extern(C) void main() {
     puts("Hello world");
}
$ ldc2 -mtriple=aarch64-linux-gnu -gcc=aarch64-linux-gnu-gcc 
-betterC hello.d
$ file hello
hello: ELF 64-bit LSB pie executable, ARM aarch64, version 1 
(SYSV), dynamically linked, interpreter 
/lib/ld-linux-aarch64.so.1, 
BuildID[sha1]=d78ca80f36c54f0b83565d7adcf29b6161567a2f, for 
GNU/Linux 3.7.0, not stripped
```

> The documentation says that you have to jump a bit through 
> hoops to get LLVM working if you're not building on the 
> platform that you're targeting

Which documentation are you referring to?