[CMake] CXX and CUDACXX

[Dustyn Blasig]

Thx for the info.

Since CXX and CUDA are defined together in the project() command, I don't
see a way to inject code to use the CXX compiler if no CUDAHOSTCXX or
CMAKE_CUDA_HOST_COMPILER is given without replicating the CXX search. I
tried moving CUDA out to an enable_language(CUDA) call instead so I could
set those variables between project(foo LANGUAGES CXX) and
enable_language(CUDA), but I'm seeing other issues with that approach.

Any other suggestions? If not, we'll just wrap our cmake invocation in a
script to help setup the environment properly for now.

Thx!

On Tue, Apr 16, 2019 at 1:10 PM Robert Maynard <robert.maynard at kitware.com>
wrote:

> The default implementation is to defer to  CUDA for selecting what
> ever host compiler it would like. To make sure that CMake uses the
> same CXX and CUDACXX compiler you will need to explicitly state that
> either through the CUDAHOSTCXX env variable (
> https://cmake.org/cmake/help/v3.12/envvar/CUDAHOSTCXX.html ) or with
> CMAKE_CUDA_HOST_COMPILER on the initial configuration of a project.
>
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