CUDA: Do not device link if CUDA is not an enabled language

Checks added in commit 81b4d10d8f (CUDA: More exhaustive checks to
determine when to do device linking, 2019-05-09, v3.15.0-rc1~82^2)
assumed that CUDA properties would be set only if CUDA is enabled.

We cannot do a device link step if we do not have the CUDA language
enabled.  This was discovered as some projects unconditionally set CUDA
properties such as `CUDA_RESOLVE_DEVICE_SYMBOLS` even when the CUDA
language has not been enabled.

Fixes: #19432

1 files changed, 9 insertions, 0 deletions

diff --git a/Tests/Cuda/NotEnabled/main.cxx b/Tests/Cuda/NotEnabled/main.cxx
new file mode 100644
index 0000000..a644207
--- /dev/null
+++ b/Tests/Cuda/NotEnabled/main.cxx
@@ -0,0 +1,9 @@
+
+#include <type_traits>
+
+int main(int argc, char** argv)
+{
+  // make sure we have c++11 enabled
+  using returnv = std::integral_constant<int, 0>;
+  return returnv::value;
+}