/* It is a constraint violation for a static function to be declared but not defined if it is used except in a sizeof expression whose result is an integer constant. In GNU C, we need to consider __typeof__ and __alignof__ as well. __alignof__ always returns a constant, so static functions can always be used therein. __typeof__ evaluates its argument iff it has variably modified type. */ /* Origin: Joseph Myers */ /* { dg-do compile } */ /* { dg-options "-O2 -std=gnu99 -pedantic-errors" } */ /* __alignof__, OK. */ static int f0(void); void g0(void) { __alignof__(f0()); } /* __typeof__ not variably modified, OK. */ static int f1(void); void g1(void) { __typeof__(f1()) x; } /* __typeof__ variably modified, not OK. */ static int f2(void); /* { dg-error "used but never defined" } */ void g2(void) { __typeof__(int [f2()]) x; } /* __typeof__ variably modified, not OK. */ static int f3(void); /* { dg-error "used but never defined" } */ void g3(void) { __typeof__(int (*)[f3()]) x; } /* Integer sizeof of VM typeof, OK. */ static int f4(void); void g4(void) { sizeof(__typeof__(int (*)[f3()])); }