warn-bad-function-cast.c
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// RUN: %clang_cc1 %s -fsyntax-only -Wno-unused-value -Wbad-function-cast -triple x86_64-unknown-unknown -verify
// rdar://9103192
void vf(void);
int if1(void);
char if2(void);
long if3(void);
float rf1(void);
double rf2(void);
_Complex double cf(void);
enum e { E1 } ef(void);
_Bool bf(void);
char *pf1(void);
int *pf2(void);
void
foo(void)
{
/* Casts to void types are always OK. */
(void)vf();
(void)if1();
(void)cf();
(const void)bf();
/* Casts to the same type or similar types are OK. */
(int)if1();
(long)if2();
(char)if3();
(float)rf1();
(long double)rf2();
(_Complex float)cf();
(enum f { F1 })ef();
(_Bool)bf();
(void *)pf1();
(char *)pf2();
/* All following casts issue warning */
(float)if1(); /* expected-warning {{cast from function call of type 'int' to non-matching type 'float'}} */
(double)if2(); /* expected-warning {{cast from function call of type 'char' to non-matching type 'double'}} */
(_Bool)if3(); /* expected-warning {{cast from function call of type 'long' to non-matching type '_Bool'}} */
(int)rf1(); /* expected-warning {{cast from function call of type 'float' to non-matching type 'int'}} */
(long)rf2(); /* expected-warning {{cast from function call of type 'double' to non-matching type 'long'}} */
(double)cf(); /* expected-warning {{cast from function call of type '_Complex double' to non-matching type 'double'}} */
(int)ef(); /* expected-warning {{cast from function call of type 'enum e' to non-matching type 'int'}} */
(int)bf(); /* expected-warning {{cast from function call of type '_Bool' to non-matching type 'int'}} */
(__SIZE_TYPE__)pf1(); /* expected-warning {{cast from function call of type 'char *' to non-matching type 'unsigned long'}} */
(__PTRDIFF_TYPE__)pf2(); /* expected-warning {{cast from function call of type 'int *' to non-matching type 'long'}} */
}