[PATCH] D37906: [CUDA] Work around a new quirk in CUDA9 headers.

[Artem Belevich via Phabricator via cfe-commits]

This revision was automatically updated to reflect the committed changes.
Closed by commit rL313369: [CUDA] Work around a new quirk in CUDA9 headers. (authored by tra).

Changed prior to commit:
  https://reviews.llvm.org/D37906?vs=115415&id=115422#toc

Repository:
  rL LLVM

https://reviews.llvm.org/D37906

Files:
  cfe/trunk/lib/Headers/__clang_cuda_runtime_wrapper.h


Index: cfe/trunk/lib/Headers/__clang_cuda_runtime_wrapper.h
===================================================================
--- cfe/trunk/lib/Headers/__clang_cuda_runtime_wrapper.h
+++ cfe/trunk/lib/Headers/__clang_cuda_runtime_wrapper.h
@@ -254,7 +254,17 @@
 #pragma push_macro("__GNUC__")
 #undef __GNUC__
 #define signbit __ignored_cuda_signbit
+
+// CUDA-9 omits device-side definitions of some math functions if it sees
+// include guard from math.h wrapper from libstdc++. We have to undo the header
+// guard temporarily to get the definitions we need.
+#pragma push_macro("_GLIBCXX_MATH_H")
+#if CUDA_VERSION >= 9000
+#undef _GLIBCXX_MATH_H
+#endif
+
 #include "math_functions.hpp"
+#pragma pop_macro("_GLIBCXX_MATH_H")
 #pragma pop_macro("__GNUC__")
 #pragma pop_macro("signbit")
 


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