HOWTO: Check version of OpenMP on Linux|Unix

echo | cpp -fopenmp -dM | grep -i open // with GNU

icc -qopenmp -dM -E test.c | grep OPENMP // with Intel

https://stackoverflow.com/questions/1304363/how-to-check-the-version-of-openmp-on-linux#13612520 https://stackoverflow.com/questions/5736790/detect-icc-vs-gcc-at-compile-time