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From: andrew@teletron.UUCP (Andrew Scott)
Newsgroups: comp.lang.c
Subject: lint question
Message-ID: <99@teletron.UUCP>
Date: Tue, 15-Sep-87 15:45:28 EDT
Article-I.D.: teletron.99
Posted: Tue Sep 15 15:45:28 1987
Date-Received: Sun, 20-Sep-87 03:00:22 EDT
Organization: TeleTronic Communications Ltd., Edmonton, Alta.
Lines: 37
Keywords: lint  function pointer  cast

I've noticed something odd while working with pointers to functions.
Specifically, I have a chunk of code which is simulating a function
call.  The code pushes a return address onto the "stack" (declared as
an integer array) like so:

	void foo()
	{
		/* do some stuff */
	}

	void push()
	{
		extern int *stack_ptr;

		*(--stack_ptr) = (int) foo;
	}


Lint returns the following messages:

	(10)  operands of CAST have incompatible types
	(10)  operands of = have incompatible types


However, lint is happy if I declare `foo' as:

	int foo()
	{
		/* do some stuff */
	}

In either case, the compiler says nothing and produces the intended code result.
Is my version of lint broken?  I would have thought that a cast from a function
pointer to an integer would be the same thing for any function, no matter what
type value it returns (including void).

	Andrew