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My question is, shouldn't the linker (CRTPGM) check the entire procedure
(function) signature including the parameters passed, not just the name?

As far as I know, there's no "function" signature in ILE. There's a signature on a service program, but that only contains the names and sequence of the procedures, it does not include parameters.

Or would that be the job of the CRTCLMOD compiler?

In order for the CL compiler to do it, CL would have to use prototypes, since the compiler has no knowledge of what you're binding it to. CL doesn't support prototypes.

As I said, all works fine, but intuitively I would have expected either the CL compiler or the CRTPGM linker to complain about parameter mismatch. What am I missing?

Parameters when calling a procedure aren't any different from those when calling a program. There's no way (currently) for CRTCLMOD to know what parameters the procedure expects, nor is there any way for the binder to know this. Instead, they trust you to pass the parameters that the function expects.


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