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cmake (2/3): 
-- The C compiler identification is GNU 7.5.0
-- The CXX compiler identification is GNU 7.5.0
-- Check for working C compiler: /usr/bin/cc
-- Check for working C compiler: /usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Check for working CXX compiler: /usr/bin/c++
-- Check for working CXX compiler: /usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Configuring done
-- Generating done
-- Build files have been written to: /out/build
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make (3/3): 
Scanning dependencies of target ex3
[ 14%] Building CXX object CMakeFiles/ex3.dir/add.cpp.o
[ 28%] Building CXX object CMakeFiles/ex3.dir/ex3.cpp.o
[ 42%] Linking CXX executable ex3
[ 42%] Built target ex3
Scanning dependencies of target ex1
[ 57%] Building CXX object CMakeFiles/ex1.dir/ex1.cpp.o
[ 71%] Linking CXX executable ex1
[ 71%] Built target ex1
Scanning dependencies of target ex2
[ 85%] Building CXX object CMakeFiles/ex2.dir/ex2.cpp.o
[100%] Linking CXX executable ex2
[100%] Built target ex2
finished