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Merge topic 'vtkm_add_target_information_support_multiple_targets'
e37c2061c vtkm_add_target_information now supports multiple targets Acked-by: Kitware Robot <kwrobot@kitware.com> Merge-request: !1838
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commit
d7ecf2241a
@ -139,12 +139,13 @@ endfunction()
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#-----------------------------------------------------------------------------
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# Add a relevant information to target that wants to use VTK-m.
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#
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# This is a higher order function to allow build-systems that use VTK-m
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# to compose add_library/add_executable and the required information to have
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# VTK-m enabled.
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# This higher order function allow build-systems that use VTK-m
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# to use `add_library` or `add_executable` calls but still have an
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# easy to way to get the required information to have VTK-m using
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# compilation units compile correctly.
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#
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# vtkm_add_target_information(
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# target
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# target[s]
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# [ MODIFY_CUDA_FLAGS ]
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# [ EXTENDS_VTKM ]
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# [ DEVICE_SOURCES <source_list>
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@ -159,10 +160,14 @@ endfunction()
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# target_link_libraries(lib_that_uses_vtkm PRIVATE vtkm_filter)
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#
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# MODIFY_CUDA_FLAGS: If enabled will add the required -arch=<ver> flags
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# that VTK-m was compiled with. This functionality is also provided by the
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# the standalone `vtkm_get_cuda_flags` function.
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# that VTK-m was compiled with. If you have multiple libraries that use
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# VTK-m calling `vtkm_add_target_information` multiple times with
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# `MODIFY_CUDA_FLAGS` will cause duplicate compiler flags. To resolve this issue
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# you can; pass all targets and sources to a single `vtkm_add_target_information`
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# call, have the first one use `MODIFY_CUDA_FLAGS`, or use the provided
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# standalone `vtkm_get_cuda_flags` function.
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#
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# DEVICE_SOURCES: The collection of source files that are used by `target` that
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# DEVICE_SOURCES: The collection of source files that are used by `target(s)` that
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# need to be marked as going to a special compiler for certain device adapters
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# such as CUDA.
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#
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@ -198,6 +203,23 @@ function(vtkm_add_target_information uses_vtkm_target)
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${ARGN}
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)
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if(VTKm_TI_MODIFY_CUDA_FLAGS)
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vtkm_get_cuda_flags(CMAKE_CUDA_FLAGS)
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set(CMAKE_CUDA_FLAGS ${CMAKE_CUDA_FLAGS} PARENT_SCOPE)
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endif()
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set(targets ${uses_vtkm_target})
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foreach(item IN LISTS VTKm_TI_UNPARSED_ARGUMENTS)
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if(TARGET ${item})
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list(APPEND targets ${item})
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endif()
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endforeach()
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# set the required target properties
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set_target_properties(${targets} PROPERTIES POSITION_INDEPENDENT_CODE ON)
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set_target_properties(${targets} PROPERTIES CUDA_SEPARABLE_COMPILATION ON)
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# Validate that following:
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# - We are building with CUDA enabled.
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# - We are building a VTK-m library or a library that wants cross library
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@ -206,35 +228,28 @@ function(vtkm_add_target_information uses_vtkm_target)
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# This is required as CUDA currently doesn't support device side calls across
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# dynamic library boundaries.
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if(TARGET vtkm::cuda)
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get_target_property(lib_type ${uses_vtkm_target} TYPE)
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get_target_property(requires_static vtkm::cuda requires_static_builds)
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if(requires_static AND ${lib_type} STREQUAL "SHARED_LIBRARY" AND VTKm_TI_EXTENDS_VTKM)
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#We provide different error messages based on if we are building VTK-m
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#or being called by a consumer of VTK-m. We use PROJECT_NAME so that we
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#produce the correct error message when VTK-m is a subdirectory include
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#of another project
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if(PROJECT_NAME STREQUAL "VTKm")
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message(SEND_ERROR "${uses_vtkm_target} needs to be built STATIC as CUDA doesn't"
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" support virtual methods across dynamic library boundaries. You"
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" need to set the CMake option BUILD_SHARED_LIBS to `OFF`.")
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else()
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message(SEND_ERROR "${uses_vtkm_target} needs to be built STATIC as CUDA doesn't"
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" support virtual methods across dynamic library boundaries. You"
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" should either explicitly call add_library with the `STATIC` keyword"
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" or set the CMake option BUILD_SHARED_LIBS to `OFF`.")
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endif()
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endif()
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set_source_files_properties(${VTKm_TI_DEVICE_SOURCES} PROPERTIES LANGUAGE "CUDA")
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endif()
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foreach(target IN LISTS targets)
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get_target_property(lib_type ${target} TYPE)
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get_target_property(requires_static vtkm::cuda requires_static_builds)
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set_target_properties(${uses_vtkm_target} PROPERTIES POSITION_INDEPENDENT_CODE ON)
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set_target_properties(${uses_vtkm_target} PROPERTIES CUDA_SEPARABLE_COMPILATION ON)
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if(VTKm_TI_MODIFY_CUDA_FLAGS)
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vtkm_get_cuda_flags(CMAKE_CUDA_FLAGS)
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set(CMAKE_CUDA_FLAGS ${CMAKE_CUDA_FLAGS} PARENT_SCOPE)
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if(requires_static AND ${lib_type} STREQUAL "SHARED_LIBRARY" AND VTKm_TI_EXTENDS_VTKM)
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#We provide different error messages based on if we are building VTK-m
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#or being called by a consumer of VTK-m. We use PROJECT_NAME so that we
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#produce the correct error message when VTK-m is a subdirectory include
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#of another project
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if(PROJECT_NAME STREQUAL "VTKm")
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message(SEND_ERROR "${target} needs to be built STATIC as CUDA doesn't"
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" support virtual methods across dynamic library boundaries. You"
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" need to set the CMake option BUILD_SHARED_LIBS to `OFF`.")
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else()
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message(SEND_ERROR "${target} needs to be built STATIC as CUDA doesn't"
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" support virtual methods across dynamic library boundaries. You"
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" should either explicitly call add_library with the `STATIC` keyword"
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" or set the CMake option BUILD_SHARED_LIBS to `OFF`.")
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endif()
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endif()
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endforeach()
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endif()
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endfunction()
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58
docs/changelog/provide-cmake-helper-functions.md
Normal file
58
docs/changelog/provide-cmake-helper-functions.md
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@ -0,0 +1,58 @@
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# CMake vtkm_add_target_information() makes using vtk-m easier
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This higher order function allow build-systems that use VTK-m
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to use `add_library` or `add_executable` calls but still have an
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easy to way to get the required information to have VTK-m using
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compilation units compile correctly.
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```cmake
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vtkm_add_target_information(
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target[s]
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[ MODIFY_CUDA_FLAGS ]
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[ EXTENDS_VTKM ]
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[ DEVICE_SOURCES <source_list>
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)
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```
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Usage:
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```cmake
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add_library(lib_that_uses_vtkm STATIC a.cxx)
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vtkm_add_target_information(lib_that_uses_vtkm
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MODIFY_CUDA_FLAGS
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DEVICE_SOURCES a.cxx
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)
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target_link_libraries(lib_that_uses_vtkm PRIVATE vtkm_filter)
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```
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## Options to vtkm_add_target_information
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- MODIFY_CUDA_FLAGS: If enabled will add the required -arch=<ver> flags
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that VTK-m was compiled with. If you have multiple libraries that use
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VTK-m calling `vtkm_add_target_information` multiple times with
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`MODIFY_CUDA_FLAGS` will cause duplicate compiler flags. To resolve this issue
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you can; pass all targets and sources to a single `vtkm_add_target_information`
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call, have the first one use `MODIFY_CUDA_FLAGS`, or use the provided
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standalone `vtkm_get_cuda_flags` function.
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- DEVICE_SOURCES: The collection of source files that are used by `target(s)` that
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need to be marked as going to a special compiler for certain device adapters
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such as CUDA.
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- EXTENDS_VTKM: Some programming models have restrictions on how types can be used,
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passed across library boundaries, and derived from.
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For example CUDA doesn't allow device side calls across dynamic library boundaries,
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and requires all polymorphic classes to be reachable at dynamic library/executable
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link time.
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To accommodate these restrictions we need to handle the following allowable
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use-cases:
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- Object library: do nothing, zero restrictions
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- Executable: do nothing, zero restrictions
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- Static library: do nothing, zero restrictions
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- Dynamic library:
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- Wanting to use VTK-m as implementation detail, doesn't expose VTK-m
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types to consumers. This is supported no matter if CUDA is enabled.
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- Wanting to extend VTK-m and provide these types to consumers.
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This is only supported when CUDA isn't enabled. Otherwise we need to ERROR!
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- Wanting to pass known VTK-m types across library boundaries for others
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to use in filters/worklets. This is only supported when CUDA isn't enabled. Otherwise we need to ERROR!
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For most consumers they can ignore the `EXTENDS_VTKM` property as the default will be correct.
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@ -16,12 +16,10 @@ find_package(VTKm REQUIRED QUIET)
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add_executable(ContourTreeMesh2D ContourTreeMesh2D.cxx)
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target_link_libraries(ContourTreeMesh2D vtkm_filter)
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vtkm_add_target_information(ContourTreeMesh2D
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DEVICE_SOURCES ContourTreeMesh2D.cxx)
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add_executable(ContourTreeMesh3D ContourTreeMesh3D.cxx)
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target_link_libraries(ContourTreeMesh3D vtkm_filter)
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vtkm_add_target_information(ContourTreeMesh3D
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vtkm_add_target_information(ContourTreeMesh2D ContourTreeMesh3D
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MODIFY_CUDA_FLAGS
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DEVICE_SOURCES ContourTreeMesh3D.cxx)
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DEVICE_SOURCES
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ContourTreeMesh2D.cxx ContourTreeMesh3D.cxx)
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@ -18,9 +18,7 @@ add_executable(CosmoHaloFinder CosmoHaloFinder.cxx)
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target_link_libraries(CosmoCenterFinder PRIVATE vtkm_filter)
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target_link_libraries(CosmoHaloFinder PRIVATE vtkm_filter)
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vtkm_add_target_information(CosmoCenterFinder
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vtkm_add_target_information(CosmoCenterFinder CosmoHaloFinder
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MODIFY_CUDA_FLAGS
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DEVICE_SOURCES CosmoCenterFinder.cxx)
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vtkm_add_target_information(CosmoHaloFinder
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MODIFY_CUDA_FLAGS
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DEVICE_SOURCES CosmoHaloFinder.cxx)
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DEVICE_SOURCES
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CosmoCenterFinder.cxx CosmoHaloFinder.cxx)
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@ -16,13 +16,10 @@ find_package(VTKm REQUIRED QUIET)
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add_executable(Tetrahedralize Tetrahedralize.cxx)
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target_link_libraries(Tetrahedralize PRIVATE vtkm_filter)
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vtkm_add_target_information(Tetrahedralize
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MODIFY_CUDA_FLAGS
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DEVICE_SOURCES Tetrahedralize.cxx)
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add_executable(Triangulate Triangulate.cxx)
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target_link_libraries(Triangulate PRIVATE vtkm_filter)
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vtkm_add_target_information(Triangulate
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vtkm_add_target_information(Tetrahedralize Triangulate
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MODIFY_CUDA_FLAGS
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DEVICE_SOURCES Triangulate.cxx)
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DEVICE_SOURCES
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Tetrahedralize.cxx Triangulate.cxx)
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