find . -iname '*.cxx' -exec sed 's/alt/neu/g' -i "{}" ";"
find . -iname '*.cxx' -exec grep -iH suche "{}" ";"
gcc -march=native -Q --help=target -v
echo | gcc -E -dM -
gcc -dM -E - < /dev/null
clang -dM -E -x c /dev/null