r264205 - [CUDA] Don't define __NVCC__.

[Reid Kleckner via cfe-commits]

On Thu, Mar 24, 2016 at 8:30 AM, David Blaikie via cfe-commits <
cfe-commits at lists.llvm.org> wrote:
>
> This seems like a different tradeoff from the one Clang made for GCC
> compatibility (we define all the GCC macros, but then also define others so
> people can detect Clang). If people were just disabling features that NVCC
> didn't support, that seems fairly harmless - what sort of
> problems/difficulties did this create?
>

I think Clang is aiming for less bug-for-bug compatibility with NVCC than
with GCC or Clang, so it makes less sense to pretend to be them. I also
expect that there are fewer checks in the wild for __NVCC__ than for
_MSC_VER and __GNUC__. If we didn't *have* to define these macros to build
the world, we wouldn't, and if we can get away without defining __NVCC__,
that's great.
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