在MacOS上使用cmake编译后，空@rpath

Question

我是cmake的新手，所以我不知道自己做错了什么。我已经编写了一个自定义的Find * .cmake文件来查找特定的程序包（与Basler GigE / Usb相机配合使用的Pylon SDK）。似乎找到了编译和链接成功所需的所有内容，但是当我尝试运行程序时，出现以下错误：

dyld: Library not loaded: @rpath
  Referenced from: <long/path/to/my/project/bin/dir/BaslerImgAcq>
  Reason: image not found
Abort trap: 6

运行otool -L ./BaslerImgAcq时，得到以下输出：

./BaslerImgAcq:
    @rpath/libopencv_highgui.3.2.dylib (compatibility version 3.2.0, current version 3.2.0)
    @rpath/pylon.framework/Versions/A/Libraries/libGCBase_gcc_v3_0_Basler_pylon_v5_0.dylib (compatibility version 0.0.0, current version 0.0.0)
    @rpath/pylon.framework/Versions/A/Libraries/libGenApi_gcc_v3_0_Basler_pylon_v5_0.dylib (compatibility version 0.0.0, current version 0.0.0)
    @rpath/pylon.framework/Versions/A/Libraries/libLog_gcc_v3_0_Basler_pylon_v5_0.dylib (compatibility version 0.0.0, current version 0.0.0)
    @rpath/pylon.framework/Versions/A/Libraries/libMathParser_gcc_v3_0_Basler_pylon_v5_0.dylib (compatibility version 0.0.0, current version 0.0.0)
    @rpath/pylon.framework/Versions/A/Libraries/libNodeMapData_gcc_v3_0_Basler_pylon_v5_0.dylib (compatibility version 0.0.0, current version 0.0.0)
    @rpath/pylon.framework/Versions/A/Libraries/libXmlParser_gcc_v3_0_Basler_pylon_v5_0.dylib (compatibility version 0.0.0, current version 0.0.0)
    @rpath/pylon.framework/Versions/A/Libraries/libgxapi-5.0.5.dylib (compatibility version 5.0.0, current version 5.0.5)
    @rpath/pylon.framework/Versions/A/Libraries/liblog4cpp_gcc_v3_0_Basler_pylon_v5_0.dylib (compatibility version 0.0.0, current version 0.0.0)
    @rpath/pylon.framework/Versions/A/Libraries/libpylonbase-5.0.5.dylib (compatibility version 5.0.0, current version 5.0.5)
    @rpath/pylon.framework/Versions/A/Libraries/libpylonutility-5.0.5.dylib (compatibility version 5.0.0, current version 5.0.5)
    @rpath/pylon.framework/Versions/A/Libraries/libuxapi-5.0.5.dylib (compatibility version 5.0.0, current version 5.0.5)

    @rpath (compatibility version 2.0.0, current version 2.0.0)

    @rpath/libopencv_imgcodecs.3.2.dylib (compatibility version 3.2.0, current version 3.2.0)
    @rpath/libopencv_imgproc.3.2.dylib (compatibility version 3.2.0, current version 3.2.0)
    @rpath/libopencv_core.3.2.dylib (compatibility version 3.2.0, current version 3.2.0)
    /usr/lib/libc++.1.dylib (compatibility version 1.0.0, current version 400.9.0)
    /usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 1252.50.4)

可以看出其中有一个@rpath条目为空，尽管我可能是错的，但我认为这是导致问题的原因。

在我的CMakeLists.txt文件中，我使用以下几行找到了Pylon库：

list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake/modules")
find_package(Pylon REQUIRED)

，然后在我项目的cmake / modules文件夹中，相关代码为：

find_path(Pylon_FRAMEWORK_DIR NAMES pylon
          HINTS /Library/Frameworks/pylon.framework)

if(Pylon_FRAMEWORK_DIR)

    # Pylon has been found
    set(Pylon_FOUND TRUE)

    # Include directory:
    find_path(Pylon_INCLUDE_DIRS NAMES PylonIncludes.h
              HINTS ${Pylon_FRAMEWORK_DIR}/Headers)
    if (Pylon_INCLUDE_DIRS)
        message(STATUS "Pylon_INCLUDE_DIRS = ${Pylon_INCLUDE_DIRS}")
    endif(Pylon_INCLUDE_DIRS)

    # Library directory:
    find_path(Pylon_LIBDIR NAMES libpylonbase.dylib
              HINTS ${Pylon_FRAMEWORK_DIR}/Libraries)
    if (Pylon_LIBDIR)
        message(STATUS "Pylon_LIBDIR = ${Pylon_LIBDIR}")
    endif(Pylon_LIBDIR)

    # Clear Pylon_LIBRARIES variable (just in case not empty):
    unset(Pylon_LIBRARIES CACHE)

    # Find all library files in Pylon_LIBDIR:
    file(GLOB Pylon_LIBS ${Pylon_LIBDIR}/ *.dylib)
    foreach(Pylon_LIB ${Pylon_LIBS})
        get_filename_component(Pylon_LIB ${Pylon_LIB} NAME)
        find_library(Pylon_LIBRARY NAMES ${Pylon_LIB} HINTS ${Pylon_LIBDIR})
        if(Pylon_LIBRARY)
            list(APPEND Pylon_LIBRARIES ${Pylon_LIB})
            add_library(${Pylon_LIB} SHARED IMPORTED)
            set_property(TARGET ${Pylon_LIB} PROPERTY INTERFACE_INCLUDE_DIRECTORIES ${Pylon_INCLUDE_DIRS})
            set_property(TARGET ${Pylon_LIB} PROPERTY INTERFACE_SYSTEM_INCLUDE_DIRECTORIES ${Pylon_INCLUDE_DIRS})
            set_property(TARGET ${Pylon_LIB} PROPERTY IMPORTED_LOCATION ${Pylon_LIBRARY})
        else(Pylon_LIBRARY)
            message(STATUS "Could not find ${Pylon_LIB}")
        endif(Pylon_LIBRARY)
        unset(Pylon_LIBRARY CACHE)
    endforeach(Pylon_LIB ${Pylon_LIBS})

    set(HAVE_Pylon TRUE)

else(Pylon_FRAMEWORK_DIR)
    set(Pylon_FOUND FALSE)
endif(Pylon_FRAMEWORK_DIR)

include(FindPackageHandleStandardArgs)
find_package_handle_standard_args(Pylon 
                                  FOUND_VAR Pylon_FOUND
                                  REQUIRED_VARS Pylon_LIBRARIES Pylon_INCLUDE_DIRS
                                  VERSION_VAR Pylon_VERSION)

以更好的方式包括OSX框架（我敢肯定必须有一个更简单的方式），将不胜感激，但是无论如何，我也想知道为什么这段代码会产生一个空的@rpath。