title: not able to run c/cpp execs in eclipse cdt
body: <p>I installed eclipse and then cdt on an ubuntu system recently and was trying to make the first runnable c/c++ proj..
  I installed g++ also, and then created the first executable cpp 'Hello World' project
  some files are created... then some issues...  </p>
  
  <ol>
  <li>even though Build Automatically is selected, I have to goto the
  project n do a Build Project to build it manually, and this i have
  to do every time I make a change</li>
  <li>After Building manually, there are some new folders created with Binaries and Debug files and I can see <code>g++</code> commands in the console being executed. The project binary is output both to  debug n binaries folder. But i am not able to run these through the Green Play Button or any other way in eclipse. Even Run configuration is not showing any option for C/C++ project..<br>
  Though I can goto terminal and run the binary myself through ./
  But I want to be able to run n debug this through eclipse.<br>
  please help in fixing me this problem as I really love eclipse n have some c/cpp assignments coming soon..</li>
  </ol>
  
  <p>Console info on doing a manual project build -</p>
  
  <p><em><strong></em> Build of configuration Debug for project qwe **</strong></p>
  
  <p>make all 
  Building file: ../src/qwe.cpp
  Invoking: GCC C++ Compiler
  g++ -O0 -g3 -Wall -c -fmessage-length=0 -MMD -MP -MF"src/qwe.d" -MT"src/qwe.d" -o "src/qwe.o" "../src/qwe.cpp"
  Finished building: ../src/qwe.cpp</p>
  
  <p>Building target: qwe
  Invoking: GCC C++ Linker
  g++  -o "qwe"  ./src/qwe.o<br>
  Finished building target: qwe</p>
  
  <p><em><strong></em> Build Finished **</strong></p>