CMake Error: CMake can not determine linker language for target:

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Hi,

I am trying to create wireshark dissector plugin. I have referred README.plugins file. I have to create plugin using custom extension. I followed all the steps mentioned in README.plugins upto 3.1. But i am getting error as follows,

-- Configuring done
CMake Error at cmake/modules/WiresharkPlugin.cmake:32 (add_library):
  Cannot find source file:

    packet-75f_wirless.C

  Tried extensions .c .C .c++ .cc .cpp .cxx .m .M .mm .h .hh .h++ .hm .hpp
  .hxx .in .txx
Call Stack (most recent call first):
  plugins/75f_wireless/CMakeLists.txt:55 (add_plugin_library)

CMake Error: CMake can not determine linker language for target: 75f_wirless
-- Generating done
-- Build files have been written to: C:/Development/wireshark

So let me know how can remove this linker error.

Thanks, Nilesh