-Wall
-Wextra
-Wpedantic
-Wshadow
-Wmissing-prototypes
-Wcast-qual
-Wcast-align
-Wconversion
-Wsign-conversion
-Wdouble-promotion
-Wformat=2
-Wformat-security
-Wnull-dereference
-Wstrict-overflow=4
-Wundef
-Wswitch-enum
-Wswitch-default
-Wfloat-equal
-Wpointer-arith
-Wwrite-strings
-Wredundant-decls
-Wstack-protector