http://sourceforge.net/p/mingw-w64/mailman/mingw-w64-public/thread/509A38C6.6070807@doxos.eu/

Optimization Levels

https://gcc.gnu.org/onlinedocs/gnat_ugn/Optimization-Levels.html

https://gcc.gnu.org/onlinedocs/gcc/Optimize-Options.html

MinGW: TOO MANY SECTIONS issue