如何学习CMake生成好的config.cmake并install

可以参考librealsense的设置：
`CMake/install_config.cmake`
里面用到了[CMakePackageConfigHelpers](https://cmake.org/cmake/help/latest/module/CMakePackageConfigHelpers.html)相关内容

更简单的一点还有OpenXLSX的cmake
`OpenXLSX/CMakeLists.txt`:

```cmake
#=======================================================================================================================
# Install
#=======================================================================================================================
# Some basic stuff we'll need in this section
include(GNUInstallDirs)
include(CMakePackageConfigHelpers)
set(ConfigPackageLocation ${CMAKE_INSTALL_LIBDIR}/cmake/OpenXLSX)

# Install interface headers
install(
        FILES ${OPENXLSX_CXX_INTERFACE_HEADERS}
        DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/OpenXLSX/${dir}
)

# Install export header
install(
        FILES ${CMAKE_CURRENT_BINARY_DIR}/OpenXLSX-Exports.hpp
        DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/OpenXLSX/headers
)

file(GLOB OPENXLSX_HEADER_LIST ${CMAKE_CURRENT_LIST_DIR}/headers/*.hpp)
install(
        FILES ${OPENXLSX_HEADER_LIST}
        DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/OpenXLSX/headers
)

install(
        FILES ${CMAKE_CURRENT_LIST_DIR}/OpenXLSX.hpp
        DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/OpenXLSX
)

# Targets
install(
        TARGETS OpenXLSX
        EXPORT OpenXLSXTargets
        LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
        COMPONENT lib
        ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
        COMPONENT lib
        RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
        COMPONENT bin
        INCLUDES DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/OpenXLSX
)

set_target_properties(OpenXLSX PROPERTIES FOLDER libs VERSION ${OPENXLSX_MAJOR_VERSION}.${OPENXLSX_MINOR_VERSION}.${OPENXLSX_MICRO_VERSION} SOVERSION ${OPENXLSX_MAJOR_VERSION})

# Package version
write_basic_package_version_file(
        "${CMAKE_CURRENT_BINARY_DIR}/OpenXLSX/OpenXLSXConfigVersion.cmake"
        VERSION ${OpenXLSX_VERSION}
        COMPATIBILITY AnyNewerVersion
)
install(
        FILES
        OpenXLSXConfig.cmake
        "${CMAKE_CURRENT_BINARY_DIR}/OpenXLSX/OpenXLSXConfigVersion.cmake"
        DESTINATION ${ConfigPackageLocation}
)

# Package configuration
configure_file(OpenXLSXConfig.cmake
        "${CMAKE_CURRENT_BINARY_DIR}/OpenXLSX/OpenXLSXConfig.cmake"
        COPYONLY
        )

# Package export targets
export(
        EXPORT OpenXLSXTargets
        FILE "${CMAKE_CURRENT_BINARY_DIR}/OpenXLSX/OpenXLSXTargets.cmake"
        NAMESPACE OpenXLSX::
)
install(
        EXPORT OpenXLSXTargets
        FILE OpenXLSXTargets.cmake
        NAMESPACE OpenXLSX::
        DESTINATION ${ConfigPackageLocation}
)
```

刺客/CMake-Notes

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