[CUDA][HIP} Add a test for constexpr default ctor

Differential Revision: https://reviews.llvm.org/D68753

llvm-svn: 374502

clang/test/SemaCUDA/constexpr-ctor.cu

@@ -0,0 +1,33 @@
+// RUN: %clang_cc1 -std=c++11 -triple nvptx64-nvidia-cuda -fsyntax-only \
+// RUN:            -fcuda-is-device -verify=dev %s
+// RUN: %clang_cc1 -std=c++11 -triple x86_64-unknown-linux-gnu -fsyntax-only \
+// RUN:            -verify=host %s
+
+// host-no-diagnostics
+
+#include "Inputs/cuda.h"
+
+struct A {
+  A(); // dev-note 2{{'A' declared here}}
+};
+
+template <class T, int x> struct B {
+  T a;
+  constexpr B() = default; // dev-error 2{{reference to __host__ function 'A' in __host__ __device__ function}}
+};
+
+__host__ void f() { B<A, 1> x; }
+__device__ void f() { B<A, 1> x; } // dev-note{{called by 'f'}}
+
+struct foo {
+  __host__ foo() { B<A, 2> x; }
+  __device__ foo() { B<A, 2> x; } // dev-note{{called by 'foo'}}
+};
+
+__host__ void g() { foo x; }
+__device__ void g() { foo x; } // dev-note{{called by 'g'}}
+
+struct bar {
+  __host__ bar() { B<A, 3> x; }
+  __device__ bar() { B<A, 3> x; } // no error since no instantiation of bar
+};