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Check for CUDA headers rather than compiler #28

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Check for CUDA headers rather than compiler #28

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cece62b
Self-report installation location
sethrj Nov 12, 2025
cd1b41c
Look for CUDA toolkit instead of compiler since only headers are needed
sethrj Jan 26, 2026
066b677
Update cuda compatibility
sethrj Jan 26, 2026
20f672e
Add test
sethrj Apr 22, 2026
d54d4ec
Enable language
sethrj Apr 22, 2026
534eb09
Update cmake compatibility
sethrj Apr 22, 2026
d3b4bd5
Revert "Enable language"
sethrj Apr 22, 2026
7dbc9d2
Empty commit to retry CI
sethrj Apr 30, 2026
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2 changes: 1 addition & 1 deletion CMakeLists.txt
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Original file line number Diff line number Diff line change
@@ -1,4 +1,4 @@
cmake_minimum_required(VERSION 3.16...3.30)
cmake_minimum_required(VERSION 3.16...4.3)

include(cmake/RecordCmdLine.cmake)

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13 changes: 8 additions & 5 deletions cmake/VecCoreConfig.cmake.in
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Expand Up @@ -17,13 +17,11 @@ list(APPEND CMAKE_MODULE_PATH "${VecCore_CMAKE_DIR}")
include(CMakeFindDependencyMacro)

if (VecCore_FIND_COMPONENTS MATCHES "CUDA")
include(CheckLanguage)
check_language(CUDA)
if(CMAKE_CUDA_COMPILER)
enable_language(CUDA)
find_dependency(CUDAToolkit)
if(CUDAToolkit_FOUND)
set(VecCore_CUDA_FOUND True)
set(VecCore_CUDA_DEFINITIONS -DVECCORE_ENABLE_CUDA)
set(VecCore_CUDA_INCLUDE_DIR ${CMAKE_CUDA_TOOLKIT_INCLUDE_DIRECTORIES})
set(VecCore_CUDA_INCLUDE_DIR ${CUDAToolkit_INCLUDE_DIRS})
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@amadio amadio Mar 4, 2026

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Could you please explain the motivation for this change? The current way of doing things follows advice from CMake policy CMP0146, which suggests projects should use CMake's first class support for cuda via check_language(CUDA)/enable_language(CUDA). The addition of -DVECCORE_ENABLE_CUDA does require that the CUDA language be enabled if you are compiling CUDA code, because that will enable host/device macros, etc. If you want to handle that yourself, you can always find_package(VecCore) without specifying the CUDA component, then add_definitions(VECCORE_ENABLE_CUDA) yourself, without having to change this logic.

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@amadio amadio Mar 4, 2026

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For the record, this was last modified in this commit 743566f.

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@sethrj sethrj Apr 22, 2026

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The article you link is about CUDA compilation, and CUDAToolkit is about locating the libraries. Since VecCore doesn't build any CUDA files at all, it doesn't need to enable the full language: linking against CUDA::cudart (or including CUDAToolkit_INCLUDE_DIRS) lets cuda_runtime.h and the associated macros to be found by C++ compilers.

endif()
endif()

Expand Down Expand Up @@ -80,3 +78,8 @@ if (VecCore_FOUND AND NOT TARGET VecCore::VecCore)
INTERFACE_LINK_LIBRARIES "${VecCore_LIBRARIES}")
endif()
endif()

# Print a pretty message if the caller doesn't have a FindVecCore.cmake
include(FindPackageHandleStandardArgs)
set(${CMAKE_FIND_PACKAGE_NAME}_CONFIG "${CMAKE_CURRENT_LIST_FILE}")
find_package_handle_standard_args(VecCore CONFIG_MODE HANDLE_COMPONENTS)
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