Pass --define=using_cuda_nvcc to CUDA builds.

This has no practical effect, as CUDA builds are always with nvcc, but
it lets us modify the build config rule
//third_party/gpus/cuda:using_nvcc so it returns true, rather than
false, for CUDA builds.
Change: 122288952

third_party/gpus/cuda/BUILD

@@ -18,8 +18,7 @@ config_setting(
 config_setting(
     name = "using_gcudacc",
     values = {
-        "define": "using_cuda=true",
-        "copt": "--use_gcudacc",
+        "define": "using_cuda_gcudacc=true",
     },
     visibility = ["//visibility:public"],
 )
@@ -27,8 +26,7 @@ config_setting(
 config_setting(
     name = "using_nvcc",
     values = {
-        "define": "using_cuda=true",
-        "copt": "--use_nvcc",
+        "define": "using_cuda_nvcc=true",
     },
 )
 

tools/bazel.rc.template

 build:cuda --crosstool_top=//third_party/gpus/crosstool
-build:cuda --define=using_cuda=true
+build:cuda --define=using_cuda=true --define=using_cuda_nvcc=true
 
 build --force_python=py$PYTHON_MAJOR_VERSION
 build --python$PYTHON_MAJOR_VERSION_path=$PYTHON_BINARY