Why doesn't the D compiler include the C preprocessor for importC?

[Dave P.]

On Thursday, 19 January 2023 at 05:04:11 UTC, Ki Rill wrote:
> I am genuinely curious about this. What are the arguments 
> against it?

The main reason is that other compilers/platforms define a huge 
number of macros and extensions that real header files depend on. 
There is already a C preprocessor written in D 
(https://github.com/walterbright/warp) that could be used, but 
there’s an endless parade of predefined macros.