CMP0042

在mac某机器中cmake生成makefile文件的时候，发现提示如下:

....
CMake Warning (dev):
  Policy CMP0042 is not set: MACOSX_RPATH is enabled by default.  Run "cmake
  --help-policy CMP0042" for policy details.  Use the cmake_policy command to
  set the policy and suppress this warning.

  MACOSX_RPATH is not specified for the following targets:

   cjson
   iniparser
   stemmer
   word2vec

This warning is for project developers.  Use -Wno-dev to suppress it.

-- Generating done
....

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