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CMAKE_CUDA_IMPLICIT_INCLUDE_DIRECTORIES not set

/usr/share/cmake/Modules/Platform/UnixPaths.cmake:

CMAKE_C_IMPLICIT_INCLUDE_DIRECTORIES
CMAKE_CXX_IMPLICIT_INCLUDE_DIRECTORIES

This file should also specify CMAKE_CUDA_IMPLICIT_INCLUDE_DIRECTORIES, as CUDA is a supported language.

As a workaround, we specify list(APPEND CMAKE_CUDA_IMPLICIT_INCLUDE_DIRECTORIES "${CMAKE_CXX_IMPLICIT_INCLUDE_DIRECTORIES}") in our root CMakeLists.txt.

This is a problem with CUDA 9 - GCC 6 combo. (GCC 6 uses include_next, and the non excluded -isystem paths mixes up its resolution)

Edited by Brad King
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