-O3 with MinGW 4.9.1 on Windows crashes, only use -O2 for now
-O3 with MinGW 4.9.1 on Windows crashes, only use -O2 for now

ds283/splinter,ds283/splinter,bgrimstad/splinter,bgrimstad/splinter,ds283/splinter,bgrimstad/splinter,bgrimstad/splinter,ds283/splinter,ds283/splinter,bgrimstad/splinter