Compiler not checking parameters in function calls for functions without parameters

Westin Sykes

I have found what looks like a compiler bug to me. I am using TI v5.1.5 for an RM48 platform. I have found that if a function has no parameters and the declaration of that function does not use void in the parameter list, there appears to be no checking of parameters when the function is called. The function can be called with an arbitrary amount of parameters with no compiler error or warning. I looked closer and found that the assembly produced pushes these parameters onto the stack just as it should if the parameters were supposed to be there. Here is an example in case there is any ambiguity. I have tried this in multiple projects and found identical results.

int foo();

int main()

{

foo(1, 2, 3, 4, 5); // NO COMPILER ERROR!

}

int foo()

{

//Do something.

}

Thanks,

Westin

over 9 years ago

0 Charles Tsai over 9 years ago

TI__Guru**** 191906 points

Hi Westin,
I see the same thing with my version of the compiler (5.2.2). I will forward your post to the compiler team for further comments.

0 Westin Sykes over 9 years ago in reply to Charles Tsai

Expert 1335 points

Great, thanks.

0 Archaeologist over 9 years ago

TI__Guru* 84285 points

This is not an error. The declaration "int foo();" is not a full prototype; it merely declares that a function foo exists which returns int, and the arguments are unspecified. If you want to positively assert that foo takes no arguments, you must declare foo as "int foo(void);". Alternately, you can compile the file as a C++ file, which has stricter requirements on function declarations.

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Compiler not checking parameters in function calls for functions without parameters