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envirnment: ubuntu 12.04 x64, gcc (Ubuntu/Linaro 4.6.3-1ubuntu5) 4.6.3

markqiu@markqiu-Latitude-E6420:~/dev/RCF-2.0.0.2685/demo/cmake/bin$ make all
-- Configuring done
-- Generating done
-- Build files have been written to: /home/markqiu/dev/RCF-2.0.0.2685/demo/cmake/bin
[ 25%] Building CXX object RcfLib/CMakeFiles/RcfLib.dir/home/markqiu/dev/RCF-2.0.0.2685/src/RCF/RCF.cpp.o
Linking CXX static library ../libRcfLib.a
[ 25%] Built target RcfLib
[ 50%] Building CXX object RcfDll/CMakeFiles/RcfDll.dir/home/markqiu/dev/RCF-2.0.0.2685/src/RCF/RCF.cpp.o
Linking CXX shared library ../libRcfDll.so
[ 50%] Built target RcfDll
Scanning dependencies of target Client
[ 75%] Building CXX object Client/CMakeFiles/Client.dir/home/markqiu/dev/RCF-2.0.0.2685/demo/Client.cpp.o
Linking CXX executable .
/usr/bin/ld: cannot open output file .: Is a directory
collect2: ld return 1
make[2]: *** [Client] error 1
make[1]: *** [Client/CMakeFiles/Client.dir/all] error 2
make: *** [all] error 2

Thanks for reporting this. There is a problem when using cmake with the "Unix Makefiles" generator - the"Client" and "Server" targets are defined in folders of the same name, respectively, and this is throwing the linker for some reason.

To fix that I've renamed the Client and Server targets to DemoClient and DemoServer.

To do the same thing in your own copy, change the contents of demo\cmake\Client\CMakeLists.txt to this:
, and change the contents of demo\cmake\Server\CMakeLists.txt to this:

Thank you. The problem is solved.