For contrast, gforth (a prominent Forth interpreter, by Forth standards) generates+compiles+links binding code in C, at runtime, using the ordinary C toolchain. [0][1][2]

A bit 'out there' you may say, but on the plus side this approach enables handling header files and tidily expressing bindings without the need to implement their own C parser. [2]

[0] GitHub mirror: https://github.com/forthy42/gforth/blob/dda77d851ddeb80ca849...

[1] The official host: https://git.savannah.gnu.org/cgit/gforth.git/tree/libcc.fs

[2] https://rosettacode.org/wiki/Call_a_foreign-language_functio...

Does this mean you can directly import C headers in D?