Compiling Can anyone explain me the difference between

[Natan Beckman]

Can anyone explain me the difference between:

# Config for 64Bits

#DEBUG_FLAGS="-O0 -march=native -fomit-frame-pointer"

#DEBUG_FLAGS="-O3 -march=native -fomit-frame-pointer"

O0 or O3?

I use Linux Ubuntu 13 64 bits

 

[dominique120]

Those are GCC Optimization levels. Read more about it in these two link:
https://gcc.gnu.org/onlinedocs/gcc/Optimize-Options.html
https://gcc.gnu.org/onlinedocs/gcc-4.7.4/gnat_ugn_unw/Optimization-Levels.html

 

[Natan Beckman]

Thanks a lot!