[PATCH] D18882: [CUDA] Tweak math forward declares so we're compatible with libstdc++4.9.

[Justin Lebar via cfe-commits]

jlebar created this revision.
jlebar added a reviewer: rsmith.
jlebar added subscribers: tra, cfe-commits.

See comments in patch; we were assuming that some stdlib math functions
would be defined in namespace std, when in fact the spec says they
should be defined in the global namespace.  libstdc++4.9 became more
conforming and broke us.

This new implementation seems to cover the known knowns.

http://reviews.llvm.org/D18882

Files:
  lib/Headers/__clang_cuda_cmath.h
  lib/Headers/__clang_cuda_math_forward_declares.h
  lib/Headers/__clang_cuda_runtime_wrapper.h

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