-Wbad-function-cast what is a non-matching type

[Bill Priest <priestwilliaml at yahoo dot com>]

gcc 3.2.2 (stock) on Linux ix86
gcc -c -Wbad-function-cast bad_cast_warn.c

bad_cast_warn.c: In function `bad_cast_main':
bad_cast_warn.c:15: warning: cast does not match
function type

unsigned short int bad_cast_warn_func1(void);
long bad_cast_warn_func2(void);
double bad_cast_warn_func3(void);

void bad_cast_main(void)
{
	double value1;
	double value2;
	double value3;
	double value4;
	double value5;
	double value6;


	value1 = bad_cast_warn_func1();
	value2 = (double) bad_cast_warn_func1();
	value3 = bad_cast_warn_func2();
	value4 = (short) bad_cast_warn_func2();
	value5 = (unsigned long) bad_cast_warn_func2();
	value6 = bad_cast_warn_func3();
}

>From the man page
-Wbad-function-cast (C only)
Warn whenever a function call is cast to a
non-matching type.  For example, warn if "int
malloc()" is cast
to "anything *".

What is the definition of non-matching??
It would seem to me that value4 above would be a
non-matching type (


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