/in/foo.cc:3:30: warning: '-std=c++14' is not an option that controls warnings [-Wpragmas]
 #pragma GCC diagnostic error "-std=c++14"
                              ^~~~~~~~~~~~
/in/foo.cc:4:30: warning: '-fwhole-program' is not an option that controls warnings [-Wpragmas]
 #pragma GCC diagnostic error "-fwhole-program"
                              ^~~~~~~~~~~~~~~~~
/in/foo.cc:5:30: warning: '-fcse-skip-blocks' is not an option that controls warnings [-Wpragmas]
 #pragma GCC diagnostic error "-fcse-skip-blocks"
                              ^~~~~~~~~~~~~~~~~~~
/in/foo.cc:6:30: warning: '-funsafe-loop-optimizations' is not an option that controls warnings [-Wpragmas]
 #pragma GCC diagnostic error "-funsafe-loop-optimizations"
                              ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~