[CMake] how do you allow CMAKE_CUDA_COMPILER to be optional via project LANGUAGE?

[Robert Maynard]

The way Eric suggest with check_language is what I use when I want to
conditionally support CUDA.

On Tue, Aug 28, 2018 at 10:28 AM Eric Noulard <eric.noulard at gmail.com>
wrote:

>
>
> Le mar. 28 août 2018 à 19:07, Quang Ha <quang.t.ha.20 at gmail.com> a écrit :
>
>> Hi all,
>>
>> So this question is again about project(foo LANGUAGES CXX CUDA). Is it
>> possible to switch off CUDA if Cmake couldn't find CUDA compiler? I.e.
>> something along the line:
>>
>
> May be you can only:
>
>   project(foo LANGUAGES CXX)
>
> then
>
> include(CheckLanguage)
> check_language(CUDA)
> if(CMAKE_CUDA_COMPILER)
>   enable_language(CUDA)
> else()
>   message(STATUS "No CUDA compiler found")
> endif()
>
> see doc:
> https://cmake.org/cmake/help/latest/module/CheckLanguage.html
>
>
> Eric
>
>
>> if (CUDA_FOUND)
>>   set_language_to_CUDA_and_CXX
>> else(CUDA_FOUND)
>>   set_language_to_CXX_only
>> endif(CUDA_FOUND)
>>
>> The main reason is I don't want CMake to fail when CUDA compiler isn't
>> available. Rather, it should continue to compile the source files using CPP
>> compilers instead.
>>
>> Thanks,
>> Quang
>> --
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>
>
> --
> Eric
> --
>
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>
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