[CUDA] Don't define __NVCC__.

Summary:
We decided this makes life too difficult for code authors.  For example,
people may want to detect NVCC and disable variadic templates, which
NVCC does not support, but which we do.

Since people are going to have to change compiler flags *anyway* in
order to compile with clang, if they really want the old behavior, they
can pass -D__NVCC__.

Tested with tensorflow and thrust, no apparent problems.

Reviewers: tra

Subscribers: cfe-commits

Differential Revision: http://reviews.llvm.org/D18417

llvm-svn: 264205

diff --git a/clang/lib/Headers/__clang_cuda_runtime_wrapper.h b/clang/lib/Headers/__clang_cuda_runtime_wrapper.h
index 8753a8c..95d1f5f 100644 (file)
--- a/clang/lib/Headers/__clang_cuda_runtime_wrapper.h
+++ b/clang/lib/Headers/__clang_cuda_runtime_wrapper.h
@@ -199,7 +199,6 @@ static inline __device__ void __brkpt(int __c) { __brkpt(); }
 // Set up compiler macros expected to be seen during compilation.
 #undef __CUDABE__
 #define __CUDACC__
-#define __NVCC__
 
 #if defined(__CUDA_ARCH__)
 // We need to emit IR declaration for non-existing __nvvm_reflect() to