https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71889
--- Comment #3 from Marek Behun <kabel at blackhole dot sk> --- > Enabling optimizations without any -O is a no-op so you effectively tested > -O0. So even if I use all the -f flags, without any -O, they are not turned on? So if I want for example just to turn on half of the -O1 flags, I jave to use -O1 and -fno-* for all the -O1 flags that I don't want? > What GCC version was able to compile the file? 4.9.3 compiled Python successfuly.