77 lines
1.9 KiB
C
77 lines
1.9 KiB
C
// RUN: clang-cc -fsyntax-only -verify -fmath-errno=0 %s
|
|
|
|
int foo(int X, int Y);
|
|
|
|
double sqrt(double X); // implicitly const because of -fno-math-errno!
|
|
|
|
void bar(volatile int *VP, int *P, int A,
|
|
_Complex double C, volatile _Complex double VC) {
|
|
|
|
VP == P; // expected-warning {{expression result unused}}
|
|
(void)A;
|
|
(void)foo(1,2); // no warning.
|
|
|
|
A == foo(1, 2); // expected-warning {{expression result unused}}
|
|
|
|
foo(1,2)+foo(4,3); // expected-warning {{expression result unused}}
|
|
|
|
|
|
*P; // expected-warning {{expression result unused}}
|
|
*VP; // no warning.
|
|
P[4]; // expected-warning {{expression result unused}}
|
|
VP[4]; // no warning.
|
|
|
|
__real__ C; // expected-warning {{expression result unused}}
|
|
__real__ VC;
|
|
|
|
// We know this can't change errno because of -fno-math-errno.
|
|
sqrt(A); // expected-warning {{expression result unused}}
|
|
}
|
|
|
|
extern void t1();
|
|
extern void t2();
|
|
void t3(int c) {
|
|
c ? t1() : t2();
|
|
}
|
|
|
|
// This shouldn't warn: the expr at the end of the stmtexpr really is used.
|
|
int stmt_expr(int x, int y) {
|
|
return ({int _a = x, _b = y; _a > _b ? _a : _b; });
|
|
}
|
|
|
|
void nowarn(unsigned char* a, unsigned char* b)
|
|
{
|
|
unsigned char c = 1;
|
|
*a |= c, *b += c;
|
|
|
|
|
|
// PR4633
|
|
int y, x;
|
|
((void)0), y = x;
|
|
}
|
|
|
|
void t4(int a) {
|
|
int b = 0;
|
|
|
|
if (a)
|
|
b == 1; // expected-warning{{expression result unused}}
|
|
else
|
|
b == 2; // expected-warning{{expression result unused}}
|
|
|
|
while (1)
|
|
b == 3; // expected-warning{{expression result unused}}
|
|
|
|
do
|
|
b == 4; // expected-warning{{expression result unused}}
|
|
while (1);
|
|
|
|
for (;;)
|
|
b == 5; // expected-warning{{expression result unused}}
|
|
|
|
for (b == 1;;) {} // expected-warning{{expression result unused}}
|
|
for (;b == 1;) {}
|
|
for (;;b == 1) {} // expected-warning{{expression result unused}}
|
|
}
|
|
|
|
|