llvm-project/clang/test/SemaCUDA/union-init.cu

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// RUN: %clang_cc1 %s --std=c++11 -triple x86_64-linux-unknown -fsyntax-only -o - -verify
#include "Inputs/cuda.h"
struct A {
int a;
__device__ A() { a = 1; }
__device__ ~A() { a = 2; }
};
// This can be a global var since ctor/dtors of data members are not called.
union B {
A a;
__device__ B() {}
__device__ ~B() {}
};
// This cannot be a global var since it has a dynamic ctor.
union C {
A a;
__device__ C() { a.a = 3; }
__device__ ~C() {}
};
// This cannot be a global var since it has a dynamic dtor.
union D {
A a;
__device__ D() { }
__device__ ~D() { a.a = 4; }
};
__device__ B b;
__device__ C c;
// expected-error@-1 {{dynamic initialization is not supported for __device__, __constant__, __shared__, and __managed__ variables.}}
__device__ D d;
// expected-error@-1 {{dynamic initialization is not supported for __device__, __constant__, __shared__, and __managed__ variables.}}
__device__ void foo() {
__shared__ B b;
__shared__ C c;
// expected-error@-1 {{initialization is not supported for __shared__ variables.}}
__shared__ D d;
// expected-error@-1 {{initialization is not supported for __shared__ variables.}}
}