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+cmake_minimum_required(VERSION 3.24)
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+project(cxx_modules_export_usage CXX)
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+
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+include("${CMAKE_SOURCE_DIR}/../cxx-modules-rules.cmake")
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+
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+add_library(export_usage STATIC)
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+target_sources(export_usage
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+ PRIVATE
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+ forward.cxx
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+ PRIVATE
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+ FILE_SET modules_private TYPE CXX_MODULES
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+ BASE_DIRS
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+ "${CMAKE_CURRENT_SOURCE_DIR}"
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+ FILES
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+ private.cxx
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+ PUBLIC
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+ FILE_SET modules TYPE CXX_MODULES
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+ BASE_DIRS
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+ "${CMAKE_CURRENT_SOURCE_DIR}"
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+ FILES
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+ importable.cxx)
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+target_compile_features(export_usage PUBLIC cxx_std_20)
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+
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+list(APPEND CMAKE_CXX_KNOWN_FEATURES
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+ exported
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+ buildiface
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+ installiface
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+ buildlocaliface)
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+
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+target_include_directories(export_usage
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+ PRIVATE
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+ "/usr/exported"
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+ "$<BUILD_INTERFACE:/usr/buildiface>"
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+ "$<INSTALL_INTERFACE:/usr/installiface>"
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+ "$<BUILD_LOCAL_INTERFACE:/usr/buildlocaliface>")
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+target_compile_definitions(export_usage
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+ PRIVATE
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+ "exported"
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+ "$<BUILD_INTERFACE:buildiface>"
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+ "$<INSTALL_INTERFACE:installiface>"
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+ "$<BUILD_LOCAL_INTERFACE:buildlocaliface>")
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+target_compile_features(export_usage
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+ PRIVATE
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+ "cxx_std_11"
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+ "$<BUILD_INTERFACE:cxx_std_14>"
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+ "$<INSTALL_INTERFACE:cxx_std_17>"
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+ "$<BUILD_LOCAL_INTERFACE:cxx_std_20>")
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+
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+if (MSVC)
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+ set(variable_flag "-constexpr:depth")
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+else ()
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+ set(variable_flag "-fconstexpr-depth=")
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+endif ()
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+
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+target_compile_options(export_usage
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+ PRIVATE
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+ "${variable_flag}100"
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+ "$<BUILD_INTERFACE:${variable_flag}200>"
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+ "$<INSTALL_INTERFACE:${variable_flag}300>"
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+ "$<BUILD_LOCAL_INTERFACE:${variable_flag}400>")
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+
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+add_library(export_used INTERFACE)
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+add_library(export_build INTERFACE)
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+add_library(export_install INTERFACE)
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+add_library(export_never INTERFACE)
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+
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+target_link_libraries(export_usage
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+ PRIVATE
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+ "export_used"
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+ "$<BUILD_INTERFACE:export_build>"
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+ "$<INSTALL_INTERFACE:export_install>"
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+ "$<BUILD_LOCAL_INTERFACE:export_never>")
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+
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+install(TARGETS export_usage
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+ EXPORT CXXModules
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+ FILE_SET modules DESTINATION "lib/cxx/miu")
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+install(EXPORT CXXModules
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+ NAMESPACE CXXModules::
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+ DESTINATION "lib/cmake/export_usage"
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+ FILE "export_usage-targets.cmake")
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+install(TARGETS export_used export_build export_install
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+ EXPORT CXXModulesDeps)
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+install(EXPORT CXXModulesDeps
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+ NAMESPACE CXXModules::
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+ DESTINATION "lib/cmake/export_usage"
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+ FILE "export_usage-dep-targets.cmake")
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+file(WRITE "${CMAKE_CURRENT_BINARY_DIR}/export_usage-config.cmake"
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+ "include(\"\${CMAKE_CURRENT_LIST_DIR}/export_usage-dep-targets.cmake\")
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+include(\"\${CMAKE_CURRENT_LIST_DIR}/export_usage-targets.cmake\")
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+set(\${CMAKE_FIND_PACKAGE_NAME}_FOUND 1)
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+")
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+install(FILES "${CMAKE_CURRENT_BINARY_DIR}/export_usage-config.cmake"
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+ DESTINATION "lib/cmake/export_usage")
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+
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+set(generator
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+ -G "${CMAKE_GENERATOR}")
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+if (CMAKE_GENERATOR_TOOLSET)
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+ list(APPEND generator
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+ -T "${CMAKE_GENERATOR_TOOLSET}")
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+endif ()
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+if (CMAKE_GENERATOR_PLATFORM)
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+ list(APPEND generator
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+ -A "${CMAKE_GENERATOR_PLATFORM}")
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+endif ()
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+
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+add_test(NAME export_usage_build
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+ COMMAND
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+ "${CMAKE_COMMAND}"
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+ "-Dexpected_dir=${CMAKE_INSTALL_PREFIX}/lib/cxx/miu"
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+ "-Dexport_interfaces_flag=${variable_flag}"
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+ "-Dexport_usage_DIR=${CMAKE_INSTALL_PREFIX}/lib/cmake/export_usage"
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+ ${generator}
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+ -S "${CMAKE_CURRENT_SOURCE_DIR}/test"
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+ -B "${CMAKE_CURRENT_BINARY_DIR}/test")
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