_memsetFloat Error with dmd

[Maximilian Naderer]

On Monday, 17 March 2025 at 12:28:38 UTC, Maximilian Naderer 
wrote:
> Hello people,
>
> i have the following example. Compiled with dmd and ldc2
>
> dmd main.d -betterC
> ldc2 main.d -betterC
>
> with dmd the compilation fails with
>
>     lld-link: error: undefined symbol: _memsetFloat
>     >>> referenced by app.obj:(main)
>     Error: linker exited with status 1
>            C:\dev\dlang\dmd2\windows\bin64\lld-link.exe /NOLOGO 
> "app.obj"    
> /LIBPATH:"C:\dev\dlang\dmd2\windows\bin64\..\lib64\mingw
>
> The compilation fails only with dmd when I'm not assigning all 
> the fields of a struct like in example #3. Is this a compiler 
> error ?
>
> ```d
> struct MyStruct {
>     float[4] data;
>     float[16] matrix;
> }
>
> extern(C) int main() {
>
>
>     MyStruct sWorks = MyStruct(
>         data: [1.0f, 2.0f, 3.0f, 4.0f],
>         matrix: [
>             1.0f, 0.0f, 0.0f, 0.0f,
>             0.0f, 1.0f, 0.0f, 0.0f,
>             0.0f, 0.0f, 1.0f, 0.0f,
>             0.0f, 0.0f, 0.0f, 1.0f
>         ]);
>
>     MyStruct sWorks2;
>     sWorks2.data = [ 1.0f, 0.0f, 0.0f, 1.0f ];
>
>     MyStruct sNotWorking = MyStruct(
>         data: [ 1.0f, 0.0f, 0.0f, 1.0f ],
>         matrix: [
>             1.0f, 0.0f, 0.0f, 0.0f,
>             0.0f, 1.0f, 0.0f, 0.0f,
>             0.0f, 0.0f, 1.0f, 0.0f,
>             0.0f, 0.0f, 0.0f, 1.0f
>         ]);
>
>
>     return 0;
> }
> ```

Sorry the example should have been

```d
struct MyStruct {
     float[4] data;
     float[16] matrix;
}

extern(C) int main() {


     MyStruct sWorks = MyStruct(
         data: [1.0f, 2.0f, 3.0f, 4.0f],
         matrix: [
             1.0f, 0.0f, 0.0f, 0.0f,
             0.0f, 1.0f, 0.0f, 0.0f,
             0.0f, 0.0f, 1.0f, 0.0f,
             0.0f, 0.0f, 0.0f, 1.0f
         ]);

     MyStruct sWorks2;
     sWorks2.data = [ 1.0f, 0.0f, 0.0f, 1.0f ];

     MyStruct sNotWorking = MyStruct(
         matrix: [
             1.0f, 0.0f, 0.0f, 0.0f,
             0.0f, 1.0f, 0.0f, 0.0f,
             0.0f, 0.0f, 1.0f, 0.0f,
             0.0f, 0.0f, 0.0f, 1.0f
         ]);


     return 0;
}
```