Question

我正在尝试在OS X下的不同目录中同时安装标准OpenCV作为自定义版本。这样做，我发现OpenCV CMake导致链接失败，当库安装到非 - 标准路径（即/ usr / local除外）。我能够通过在OpenCVModule.cmake添加一行来解决这个问题：

set_target_properties(${the_module} PROPERTIES OUTPUT_NAME "${the_module}${OPENCV_DLLVERSION}" DEBUG_POSTFIX "${OPENCV_DEBUG_POSTFIX}" COMPILE_PDB_NAME "${the_module}${OPENCV_DLLVERSION}" COMPILE_PDB_NAME_DEBUG "${the_module}${OPENCV_DLLVERSION}${OPENCV_DEBUG_POSTFIX}" ARCHIVE_OUTPUT_DIRECTORY ${LIBRARY_OUTPUT_PATH} COMPILE_PDB_OUTPUT_DIRECTORY ${LIBRARY_OUTPUT_PATH} LIBRARY_OUTPUT_DIRECTORY ${LIBRARY_OUTPUT_PATH} RUNTIME_OUTPUT_DIRECTORY ${EXECUTABLE_OUTPUT_PATH} INSTALL_NAME_DIR ${CMAKE_INSTALL_PREFIX}/lib ## <--- Added this line )

我正在尝试将此更改贡献给OpenCV项目。但是，如果CMAKE_INSTALL_PREFIX设置为“/ usr / local”，则不应设置INSTALL_NAME_DIR。我尝试添加if语句：

set_target_properties(${the_module} PROPERTIES OUTPUT_NAME "${the_module}${OPENCV_DLLVERSION}" DEBUG_POSTFIX "${OPENCV_DEBUG_POSTFIX}" COMPILE_PDB_NAME "${the_module}${OPENCV_DLLVERSION}" COMPILE_PDB_NAME_DEBUG "${the_module}${OPENCV_DLLVERSION}${OPENCV_DEBUG_POSTFIX}" ARCHIVE_OUTPUT_DIRECTORY ${LIBRARY_OUTPUT_PATH} COMPILE_PDB_OUTPUT_DIRECTORY ${LIBRARY_OUTPUT_PATH} LIBRARY_OUTPUT_DIRECTORY ${LIBRARY_OUTPUT_PATH} RUNTIME_OUTPUT_DIRECTORY ${EXECUTABLE_OUTPUT_PATH} if(NOT ${CMAKE_INSTALL_PREFIX} STREQUAL "/usr/local") ## <--- this always evaluates to FALSE INSTALL_NAME_DIR ${CMAKE_INSTALL_PREFIX}/lib endif() )

我没有找到任何会导致if语句评估为true的语法。有没有办法让CMake根据INSTALL_NAME_DIR的内容有条件地设置CMAKE_INSTALL_PREFIX？

Answer 1

无法嵌套CMake命令：没有语法。但你可以在＆＃34;下执行任何命令;如果＆＃34;分支：

if(NOT CMAKE_INSTALL_PREFIX STREQUAL "/usr/local")
    set_target_properties(${the_module} PROPERTIES
        INSTALL_NAME_DIR ${CMAKE_INSTALL_PREFIX}/lib
    )
endif()

另请注意，比较变量值的首选方法＆＃34;如果＆＃34;子句是使用变量的名称，而不是解除引用它。 CMake将确定具有此名称的变量存在并自动取消引用它。 documentation中针对＆＃34;如果＆＃34;描述了这种行为。命令。

如何使用CMake有条件地为OpenCV dylib文件设置属性？

1 个答案: