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// RUN: %clang_cc1 -fblocks -fsyntax-only -Wunused-but-set-variable -verify %s
struct S {
int i;
};
int f0(void) {
int y; // expected-warning{{variable 'y' set but not used}}
y = 0;
int z __attribute__((unused));
z = 0;
struct S s; // expected-warning{{variable 's' set but not used}}
struct S t;
s = t;
// Don't warn for an extern variable.
extern int w;
w = 0;
// Following gcc, this should not warn.
int a;
w = (a = 0);
int j = 0; // expected-warning{{variable 'j' set but not used}}
for (int i = 0; i < 1000; i++)
j += 1;
// Following gcc, warn for a volatile variable.
volatile int b; // expected-warning{{variable 'b' set but not used}}
b = 0;
// volatile variable k is used, no warning.
volatile int k = 0;
for (int i = 0; i < 1000; i++)
k += 1;
// typedef of volatile type, no warning.
typedef volatile int volint;
volint l = 0;
l += 1;
int x;
x = 0;
return x;
}
void f1(void) {
(void)^() {
int y; // expected-warning{{variable 'y' set but not used}}
y = 0;
int x;
x = 0;
return x;
};
}
void f2 (void) {
// Don't warn, even if it's only used in a non-ODR context.
int x;
x = 0;
(void) sizeof(x);
}
void for_cleanup(int *x) {
*x = 0;
}
void f3(void) {
// Don't warn if the __cleanup__ attribute is used.
__attribute__((__cleanup__(for_cleanup))) int x;
x = 5;
}
void f4(void) {
int x1 = 0; // expected-warning{{variable 'x1' set but not used}}
x1++;
int x2 = 0; // expected-warning{{variable 'x2' set but not used}}
x2--;
int x3 = 0; // expected-warning{{variable 'x3' set but not used}}
++x3;
int x4 = 0; // expected-warning{{variable 'x4' set but not used}}
--x4;
static int counter = 0; // expected-warning{{variable 'counter' set but not used}}
counter += 1;
volatile int v1 = 0;
++v1;
typedef volatile int volint;
volint v2 = 0;
v2++;
}
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