> # echo | gcc -dM -E - -march=native > /usr/libexec/gcc/x86_64-pc-linux-gnu/4.5.3/cc1 -E -quiet -v - > -D_FORTIFY_SOURCE=2 -mtune=i686 -march=x86-64
Sorry, something went wrong while pasting this lines, here are the correct ones: # cc -mtune=i686 -E -v - </dev/null 2>&1 | grep cc1 /usr/libexec/gcc/x86_64-pc-linux-gnu/4.5.3/cc1 -E -quiet -v - -D_FORTIFY_SOURCE=2 -mtune=i686 -march=x86-64
