std.int128 not working with -betterC enabled

[Matheus Catarino]

On Wednesday, 20 December 2023 at 18:16:00 UTC, Renato wrote:
> I wanted to write a small program using betterC that needs to 
> use int128.
>
> This simple program works without -betterC:
>
> ```d
> module dasc;
>
> import std.int128;
> import core.stdc.stdio;
>
> extern (C):
>
> int main() {
>   auto n = Int128(128, 128);
>   printf("n=%lu%lu", n.data.hi, n.data.lo);
>   return 42;
> }
> ```
>
> But with -betterC:
>
> ```
> dmd -L-ld_classic -betterC -run dasc.d
> Undefined symbols for architecture x86_64:
>   "__D3std6int1286Int1286__ctorMFNaNbNcNiNfllZSQBpQBoQBk", 
> referenced from:
>       _main in dasc.o
> ld: symbol(s) not found for architecture x86_64
> clang: error: linker command failed with exit code 1 (use -v to 
> see invocation)
> Error: linker exited with status 1
>
> Compilation exited abnormally with code 1 at Wed Dec 20 19:11:56
> ```
>
> I don't see anywhere whether int128 is supposed to work on 
> -betterC. Is it not supported?

Would there be any reason not to use `core.int128`?

Currently, I used it to make a TigerbeetleDB client (Zig 
database) in D (betterC).
https://github.com/batiati/tigerbeetle-clients-benchmarks/blob/f86216834bd04e1e06bede2a2e31b64df0dc98f1/d/modules/tb_client.d#L12