I have 2 compilers installed. The attached minimal CMakeLists.txt example shows everything OK if using the compiler at standard place.
-- The C compiler identification is GNU 4.8.4 -- The CXX compiler identification is GNU 4.8.4 -- 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 -- CMAKE_CXX11_EXTENSION_COMPILE_OPTION = -std=gnu++11 -- Configuring done -- Generating done -- Build files have been written to: /usr2/kornel/tmp/cmake But setting for alternative compiler (on clean build dir) env{CXX} => /usr/local/gcc6.1/bin/g++ env{CC} => /usr/local/gcc6.1/bin/gcc I get following output: -- The C compiler identification is GNU 6.1.0 -- The CXX compiler identification is GNU 6.1.0 -- Check for working C compiler: /usr/local/gcc6.1/bin/gcc -- Check for working C compiler: /usr/local/gcc6.1/bin/gcc -- 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/local/gcc6.1/bin/g++ -- Check for working CXX compiler: /usr/local/gcc6.1/bin/g++ -- works -- Detecting CXX compiler ABI info -- Detecting CXX compiler ABI info - done -- Detecting CXX compile features -- Detecting CXX compile features - done -- CMAKE_CXX11_EXTENSION_COMPILE_OPTION = -std=gnu++11 -- Configuring done -- Generating done -- Build files have been written to: /usr2/kornel/tmp/cmake I expected here "-- CMAKE_CXX11_EXTENSION_COMPILE_OPTION = -std=c++14". My cmake version is "cmake version 3.6.20160714-ga6bd0" Kornel
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