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https://github.com/ceph/ceph
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bbd95765cc
before this change, we fails to detect std::filesystem with clang++, because the cmake project created by try_compile() only expands following options passed from its caller: - COMPILE_DEFINITIONS - INCLUDE_DIRECTORIES - LINK_DIRECTORIES - LINK_LIBRARIES which do not include CMAKE_CXX_FLAGS, so either we need to (ab)use COMPILE_DEFINITIONS for passing -std=c++17, or we can change the CMAKE_CXX_FLAGS in the parent env, as it turns out the created cmake project does inherit this flag from current project. in this change, we use the COMPILE_DEFINITIONS approach: simpler this way. and we can drop it once cmake 3.8 is required. Signed-off-by: Kefu Chai <kchai@redhat.com>
52 lines
1.6 KiB
CMake
52 lines
1.6 KiB
CMake
set(_std_filesystem_test_src
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${CMAKE_CURRENT_LIST_DIR}/FindStdFilesystem_test.cc)
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macro(try_std_filesystem_library _library _result)
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if(CMAKE_VERSION VERSION_LESS "3.8")
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# abuse the definition flags, because they are quite
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# the same as CMAKE_C_FLAGS: they are passed to the
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# compiler.
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set(_std_filesystem_try_compile_arg
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COMPILE_DEFINITIONS "-std=c++17")
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else()
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set(_std_filesystem_try_compile_arg
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CXX_STANDARD 17)
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endif()
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try_compile(_std_filesystem_compiles
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${CMAKE_CURRENT_BINARY_DIR}
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SOURCES ${_std_filesystem_test_src}
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LINK_LIBRARIES ${_library}
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${_std_filesystem_try_compile_arg})
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unset(_std_filesystem_try_compile_arg)
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if(_std_filesystem_compiles)
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set(${_result} ${_library})
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endif()
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unset(_std_filesystem_compiles)
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endmacro()
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if(NOT StdFilesystem_LIBRARY)
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try_std_filesystem_library("stdc++fs" StdFilesystem_LIBRARY)
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endif()
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if(NOT StdFilesystem_LIBRARY)
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try_std_filesystem_library("c++experimental" StdFilesystem_LIBRARY)
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endif()
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if(NOT StdFilesystem_LIBRARY)
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try_std_filesystem_library("c++fs" StdFilesystem_LIBRARY)
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endif()
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unset(_std_filesystem_test_src)
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include(FindPackageHandleStandardArgs)
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find_package_handle_standard_args(StdFilesystem
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FOUND_VAR StdFilesystem_FOUND
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REQUIRED_VARS StdFilesystem_LIBRARY)
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mark_as_advanced(StdFilesystem_LIBRARY)
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if(StdFilesystem_FOUND AND NOT (TARGET StdFilesystem::filesystem))
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add_library(StdFilesystem::filesystem INTERFACE IMPORTED)
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set_target_properties(StdFilesystem::filesystem PROPERTIES
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INTERFACE_LINK_LIBRARIES ${StdFilesystem_LIBRARY})
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endif()
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