[CMake] compiling .cpp/.cxx with CUDA compiler

[Dmitry Mikushin]

Compiling C++ code with CUDA compiler practically means only to implicitly
include a bunch of CUDA-specific headers like cuda_runtime_api.h. Other
than that, it's the same as compiling with the host C++ compiler. Thus, you
can get the desired behavior by explicitly including those headers in case
of C++-compilation and letting CMake include_directories to know where to
search for them.

Kind regards,
- Dmitry.


вт, 2 июл. 2019 г. в 20:19, Kai Germaschewski <kai.germaschewski at gmail.com>:

> For background, a bunch of projects help writing portable C++ code that
> can be compiled into CUDA device code as one option, e.g. hemi, kokkos,
> RAJA (https://devblogs.nvidia.com/simple-portable-parallel-c-hemi-2/). As
> a consequence, if available those source files need to be compiled with the
> CUDA compiler, but with the regular C++ compiler otherwise.
>
> I'm wondering whether there is a clean way to support this in a cmake
> build. Renaming my source files to `.cu` is bad if I'm on the system
> without CUDA. I figured out that I can set the LANGUAGE property on a given
> .cpp/.cxx source file to CUDA to have it compiled with CMAKE_CUDA_COMPILER,
> but that's quite a hassle to do for every source file. Kokkos instead
> creates a `nvcc_wrapper` script which one is supposed to use as
> CMAKE_CXX_COMPILER, but that definitely seems like a kludge to me (and
> giving me troubles).
>
> Things would probably be much better for me if there was a way to change
> the default language for .cxx / .cpp extensions. Is there a way to do this?
>
> --Kai
>
>
>
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