Delphi would compile & link 2 MLOC of code on a crappy work laptop in 30 seconds to a minute. Incremental compiles were instant. So fast most developers never bothered learning the "go to next error" hotkey and just spammed F9 (compile & run) whenever they fixed a syntax error. It was that fast.
Trivial C interop - yes. Both pascal and cdecl style calling conventions.
Toolchain? Back then - yes. Today? Probably not; depends what you mean by it. It had perfect COM interop which mattered back then, and you could trivially link stuff if you wanted to. And people did.
Comptime here means not "compilation time", but rather ability to run some your code during compilation (i. e. compile-time metaprogramming). Pascal didn't had this.
Oh my gosh! Core memories unlocked:
> most developers never bothered learning the "go to next error" hotkey and just spammed F9 (compile & run) whenever they fixed a syntax error
We didn't know we were privileged. I thought it was normal thing to have.