-std=c99
-pedantic
-pipe

-Wall
-Wcast-qual
-Wconversion
-Werror=return-type
-Werror=vla-larger-than=0
-Wextra
-Wmissing-prototypes
-Wshadow
-Wstrict-prototypes
-Wwrite-strings

-O2
-march=native
-mtune=native