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

[Quang Ha]

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:

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

[Eric Noulard]

Post by Quang Ha
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.

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

Post by Quang Ha
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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[Robert Maynard]

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

Post by Eric Noulard

Post by Quang Ha
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.

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()
https://cmake.org/cmake/help/latest/module/CheckLanguage.html
Eric

Post by Quang Ha
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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[Quang Ha]

It works perfectly - thanks!

QT

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

Post by Eric Noulard

Post by Quang Ha
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.

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()
https://cmake.org/cmake/help/latest/module/CheckLanguage.html
Eric

Post by Quang Ha
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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http://www.cmake.org/Wiki/CMake_FAQ
Kitware offers various services to support the CMake community. For more
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CMake Consulting: http://cmake.org/cmake/help/consulting.html
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http://www.kitware.com/opensource/opensource.html
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--
Eric
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