将共享库与CMake链接

我正在尝试链接一个名为libtest-lib.so的预编译共享库文件.这就是我在CMakeLists.txt底部的内容:

link_directories("/projectspath/LinkTest/TestLib/app/build/intermediates/cmake/debug/obj/armeabi-v7a")

add_library(testlib libtest-lib.so)

target_link_libraries(testlib libtest-lib.so)

如上所述,我收到以下错误:

CMake Error at CMakeLists.txt:49 (add_library):
  Cannot find source file:
    libtest-lib.so
  Tried extensions .c .C .c++ .cc .cpp .cxx .m .M .mm .h .hh .h++ .hm     .hpp
  .hxx .in .txx
 CMake Error: CMake can not determine linker language for target:    testlib

如果我注释掉add_library行,我会得到以下内容:

CMake Error at CMakeLists.txt:51 (target_link_libraries):
Cannot specify link libraries for target "testlib" which is not built by this project.

在库中链接时,似乎绝对需要源文件(.c,cpp等).但是如何链接.so文件？文档说下了关于target_link_libraries()的内容:

必须通过add_executable()或add_library()等命令在当前目录中创建named.

如果我用add_executable()替换add_library(),我会得到同样的错误.在CMake中链接.so文件的正确方法是什么？

我认为你想要的是为CMake导入一个库:

 add_library(testlib SHARED IMPORTED)
 set_property(TARGET testlib PROPERTY IMPORTED_LOCATION "/projectspath/LinkTest/TestLib/app/build/intermediates/cmake/debug/obj/armeabi-v7a/libtest-lib.so")

https://cmake.org/Wiki/CMake/Tutorials/Exporting_and_Importing_Targets了解更多信息