title: Why the opencv's library on linux is libopencv_core_pch_dephelp.a but libopencv_core.a?
body: <p>I always use opencv on windows.Now  I have a project on linux using opencv library. I notice that the static library of opencv  on linux is different with those on windows. On linux, all the library is named with such a string, _pch_dephelp. For example, libopencv_pch_dephelp.a rather than libopencv_core_version.lib(such as libopencv_core249.lib). Does the _pch_dephelp have some special meaning?</p>