cmake编译找不到已存在的动态库

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使用cmake编译时，即便添加了-DCMAKE_PREFIX_PATH参数，仍可能因找不到库中相关.cmake文件而报错。解决方法一是使用-DCMAKE_MODULE_PATH参数指定.cmake文件目录；二是在CMakeLists.txt中添加set(lib_DIR PATH)，指定库名和.cmake文件目录。

在使用cmake进行编译时，出现找不到库和头文件的情况，前提是已经添加了cmake参数-DCMAKE_PREFIX_PATH为库和头文件存放的目录，报错原因是cmake无法自动找到库里面相关的.cmake文件，

CMake Error at CMakeLists.txt:236 (find_package):
  By not providing "FindCommonAPI-SomeIP.cmake" in CMAKE_MODULE_PATH this
  project has asked CMake to find a package configuration file provided by
  "CommonAPI-SomeIP", but CMake did not find one.

  Could not find a package configuration file provided by "CommonAPI-SomeIP"
  (requested version 3.2.1) with any of the following names:

    CommonAPI-SomeIPConfig.cmake
    commonapi-someip-config.cmake

  Add the installation prefix of "CommonAPI-SomeIP" to CMAKE_PREFIX_PATH or
  set "CommonAPI-SomeIP_DIR" to a directory containing one of the above
  files.  If "CommonAPI-SomeIP" provides a separate development package or
  SDK, be sure it has been installed.

解决方法：

1. 可以尝试使用cmake参数-DCMAKE_MODULE_PATH=PATH,PATH值为该库存放路径中lib中.cmake文件的目录。

2. 在CMakeLists.txt中添加set(lib_DIR PATH)

lib为.cmake文件中文件名中库的名称。PATH为该库存放路径下lib中.cmake文件的目录。