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cmake_minimum_required(VERSION 3.19)
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project (ExportPTX CUDA)
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#Goal for this example:
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# How to generate PTX files instead of OBJECT files
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# How to reference PTX files for custom commands
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# How to install PTX files
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# PTX can be compiled only for a single virtual architecture at a time
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list(SUBLIST CMAKE_CUDA_ARCHITECTURES 0 1 CMAKE_CUDA_ARCHITECTURES)
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string(APPEND CMAKE_CUDA_ARCHITECTURES "-virtual")
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add_library(CudaPTX OBJECT kernelA.cu kernelB.cu)
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target_compile_definitions(CudaPTX PRIVATE "CUDA_PTX_COMPILATION")
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set_property(TARGET CudaPTX PROPERTY CUDA_PTX_COMPILATION ON)
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#Test ObjectFiles with file(GENERATE)
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file(GENERATE
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OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/gen_$<LOWER_CASE:$<CONFIG>/>path_to_objs.h
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CONTENT [[
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#include <vector>
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#include <string>
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#ifndef path_to_objs
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#define path_to_objs
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static std::string ptx_paths = "$<TARGET_OBJECTS:CudaPTX>";
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#endif
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]]
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)
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#We are going to need a wrapper around bin2c for multiple reasons
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# 1. bin2c only converts a single file at a time
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# 2. bin2c has only standard out support, so we have to manually
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# redirect to a cmake buffer
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# 3. We want to pack everything into a single output file, so we
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# need to also pass the --name option
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set(output_file ${CMAKE_CURRENT_BINARY_DIR}/embedded_objs.h)
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find_package(CUDAToolkit REQUIRED)
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find_program(bin_to_c
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NAMES bin2c
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PATHS ${CUDAToolkit_BIN_DIR}
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)
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if(NOT bin_to_c)
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message(FATAL_ERROR
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"bin2c not found:\n"
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" CUDAToolkit_BIN_DIR='${CUDAToolkit_BIN_DIR}'\n"
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)
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endif()
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add_custom_command(
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OUTPUT "${output_file}"
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COMMAND ${CMAKE_COMMAND}
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"-DBIN_TO_C_COMMAND=${bin_to_c}"
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"-DOBJECTS=$<TARGET_OBJECTS:CudaPTX>"
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"-DOUTPUT=${output_file}"
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-P ${CMAKE_CURRENT_SOURCE_DIR}/../utils/bin2c_wrapper.cmake
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VERBATIM
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DEPENDS $<TARGET_OBJECTS:CudaPTX>
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COMMENT "Converting Object files to a C header"
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)
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add_executable(CudaOnlyExportPTX main.cu ${output_file})
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add_dependencies(CudaOnlyExportPTX CudaPTX)
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target_include_directories(CudaOnlyExportPTX PRIVATE
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${CMAKE_CURRENT_BINARY_DIR} )
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target_compile_definitions(CudaOnlyExportPTX PRIVATE
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"CONFIG_TYPE=gen_$<LOWER_CASE:$<CONFIG>>")
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if(APPLE)
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# Help the static cuda runtime find the driver (libcuda.dyllib) at runtime.
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set_property(TARGET CudaOnlyExportPTX PROPERTY BUILD_RPATH ${CMAKE_CUDA_IMPLICIT_LINK_DIRECTORIES})
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endif()
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#Verify that we can install object targets properly
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install(TARGETS CudaPTX CudaOnlyExportPTX
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EXPORT cudaPTX
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RUNTIME DESTINATION bin
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LIBRARY DESTINATION lib
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OBJECTS DESTINATION objs
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)
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install(EXPORT cudaPTX DESTINATION lib/cudaPTX)
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