Now I am looking out for reasonable ideas.

Can we not simply see a C .h file as an interface-only module? I mean I can simply import a c .h file which gpc parses and all symbols defined in that header file are exported symbols?

I don't know how far this is feasible. And it doesn't cover a.out modules creating using other languages (GNAT, ...). But it does cover the majority of cases you need externals.

Groetjes,

Berend.