[PATCH] D18539: [CUDA] Add math forward declares.

[Justin Lebar via cfe-commits]

jlebar created this revision.
jlebar added reviewers: rnk, rsmith, tra.
jlebar added a subscriber: cfe-commits.

This is necessary for a future patch which will make all constexpr
functions implicitly host+device.  cmath may declare constexpr
functions, but these we do *not* want to be host+device.  The forward
declares added in this patch prevent this (because the rule will be,
constexpr functions become implicitly host+device unless they're
preceeded by a decl with __device__).

http://reviews.llvm.org/D18539

Files:
  lib/Headers/CMakeLists.txt
  lib/Headers/__clang_cuda_math_forward_declares.h
  lib/Headers/__clang_cuda_runtime_wrapper.h

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