FindOpenACC: Provide import targets and OpenACC_<lang>_OPTIONS variable

Previously the FindOpenACC module had issues where the contents of
OpenACC_<lang>_FLAGS could not be used with target_compile_options
when it contained multiple compiler flags.

1 files changed, 43 insertions, 0 deletions

diff --git a/Tests/FindOpenACC/CXXTest/main.cxx b/Tests/FindOpenACC/CXXTest/main.cxx
new file mode 100644
index 0000000..7369045
--- /dev/null
+++ b/Tests/FindOpenACC/CXXTest/main.cxx
@@ -0,0 +1,43 @@
+
+#include <vector>
+
+void vecaddgpu(float* r, float* a, float* b, std::size_t n)
+{
+#pragma acc kernels loop present(r, a, b)
+  for (std::size_t i = 0; i < n; ++i)
+    r[i] = a[i] + b[i];
+}
+
+int main(int, char* [])
+{
+  const std::size_t n = 100000; /* vector length */
+  std::vector<float> a(n);      /* input vector 1 */
+  std::vector<float> b(n);      /* input vector 2 */
+  std::vector<float> r(n);      /* output vector */
+  std::vector<float> e(n);      /* expected output values */
+
+  for (std::size_t i = 0; i < n; ++i) {
+    a[i] = static_cast<float>(i + 1);
+    b[i] = static_cast<float>(1000 * i);
+  }
+
+  /* compute on the GPU */
+  auto a_ptr = a.data();
+  auto b_ptr = b.data();
+  auto r_ptr = r.data();
+#pragma acc data copyin(a_ptr [0:n], b_ptr [0:n]) copyout(r_ptr [0:n])
+  {
+    vecaddgpu(r_ptr, a_ptr, b_ptr, n);
+  }
+  /* compute on the host to compare */
+  for (std::size_t i = 0; i < n; ++i)
+    e[i] = a[i] + b[i];
+  /* compare results */
+  int errs = 0;
+  for (std::size_t i = 0; i < n; ++i) {
+    if (r[i] != e[i]) {
+      ++errs;
+    }
+  }
+  return errs;
+}