Why does a “function name” evaluate to true in C and how to get warned on it

Question

I recently stumbled across the following behaviour of gcc 3.2.2 writing a c program:

In an if statement I forgot the braces of a function and wrote:

if

Answer 1

myFunc is simply the memory address of the function, and is non-zero.

Your if-statement is pretty much the same as writing:

if (0x08451234) { ... }

And as a non-zero value, it is true.

No warning seems appropriate, as it is valid and even somewhat common to test function-pointers to see if they are NULL or not.