Enumeration values not handled

Hi, all. I'm compiling with gcc -Wall -Wextra. My functions return an enumeration to the caller, and then the caller deals with it like this:

Code:

switch (result)
{
case success:
   /*blah*/
case failure:
  /*blah*/
case another:
  /*blah*/
}

Now, my switch statements do not handle all possible values within the enumeration, because I know that it is (or should be) impossible for certain values to be returned in certain circumstances. GCC gives me:

warning: enumeration value 'another' not handled in switch
warning: control reaches end of non-void function

Now whatever code GCC is generating for the other values of the switch, I know it can never be executed. What's the 'proper' way of dealing with this?

Richard (TIA)

warning: control reaches end of non-void function

That's pretty self-explanatory. You have a function that is supposed to return value. but you are not returning anything.

warning: enumeration value 'another' not handled in switch

IBM TPF Product Information Center
Daniel Brockman - Re: enumeration value ... not handled in switch

But, I'm saying, every possible code path returns a value. The compiler is wrong to think that control could ever reach the closing curly brace. It hasn't understood the code well enough... or alternatively, if control ever could reach the closing curly brace, then I stuffed up somewhere.

Richard

Code:

typedef enum { apple,orange, banana } fruit;

int main() {
  fruit f = orange;
  switch(f) {
   case apple : printf("hello world\n");
   return 0;
   case orange : printf("it's orange \n");
   return 0;
   }
 // unless you have return 0; here. 
}
$ gcc -Wall -Wextra hello.c
hello.c: In function ‘main’:
hello.c:7:3: warning: enumeration value ‘banana’ not handled in switch
hello.c:14:1: warning: control reaches end of non-void function

If f is not apple or orange, Then control falls through(no default case) and compiler is right to say warning: control reaches end of non-void function.
Edit: you could add default: case to make compiler happy.