Ldc ImportC preprocessor failure (wrong option syntax) on Windows

[Bastiaan Veelo]

On Tuesday, 4 February 2025 at 10:15:23 UTC, Bastiaan Veelo wrote:
> It could be a bug, but locally I use the same version (ldc 
> 1.39.0) and it works fine...

version 1.40.0 (DMD v2.110.0, LLVM 19.1.3) has the same issue.