D is trying to parse C and C++ inside strings

[Johan]

On Saturday, 18 March 2023 at 03:00:46 UTC, Hipreme wrote:
> I'm writing Metal shaders right now on my engine and I got the 
> following warning (I use warn as errors so this is giving me 
> nuts as I'll need to refactor my code to hide that string)
>
>
> ```d
> string getCoolString()
> {
>     return q{
>         #include <metal_stdlib>
>         #include <simd/simd.h>
>         using namespace metal;
>     };
> }
>
> void main()
> {
>     writeln(getCoolString);
> }
> ```
>
> In the run.dlang, I get the following error:
>
> ```
> Error: d++ cannot find file path for header 'metal_stdlib'
> Error Program exited with code 1
> ```

Workaround: put the #include stuff in a normal string:

```
string getCoolString()
{
     return
     "#include <metal_stdlib>
      #include <simd/simd.h>"
     ~ q{
         using namespace metal;
     };
}

void main()
{
     import std.stdio;
     writeln(getCoolString);
}
```