It's not even possible to pass too few arguments to a function in C unless you go out of your way to write bad code.
You can write a function declaration that's inconsistent with its definition in another translation unit. Declaring the function in a shared header file avoids this.
You can use an old-style declaration that doesn't specify what parameters a function expects. Don't do that. Use prototypes.
You can use a cast to convert a function pointer to an incompatible type, and call through the resulting pointer. Don't do that.
You can call a function with no visible declaration if your compiler overly permissive or is operating in pre-C99 mode. Don't do that.
Raymend Chen has probably forgotten more about programming than I'll ever know, but aren't the first two blah() function examples either missing a } or have a superfluous { after the else?
Read the post - not all architectures behave the same!
Itanic had variable-sized register windows, plus extra tag bits for NaT ("not a thing") placeholder values. If you didn't set one of the argument registers the callee might trap in unexpected ways when it touches the register garbage.
I had never considered the idea of passing too few register params so I didn't immediately think of the reuse problem. And I had no idea about Itanium's Not-a-thing bit! Always a good read from Raymond Chen.
You can write a function declaration that's inconsistent with its definition in another translation unit. Declaring the function in a shared header file avoids this.
You can use an old-style declaration that doesn't specify what parameters a function expects. Don't do that. Use prototypes.
You can use a cast to convert a function pointer to an incompatible type, and call through the resulting pointer. Don't do that.
You can call a function with no visible declaration if your compiler overly permissive or is operating in pre-C99 mode. Don't do that.
Itanium? Stone age
Kids these days!
Itanic had variable-sized register windows, plus extra tag bits for NaT ("not a thing") placeholder values. If you didn't set one of the argument registers the callee might trap in unexpected ways when it touches the register garbage.