CFLAGS = -Wall -Wextra -Wundef -Wshadow -Wpointer-arith -Wbad-function-cast \
         -Wcast-qual -Wcast-align -Wwrite-strings -Wconversion \
         -Wstrict-prototypes -Wmissing-prototypes -Wmissing-declarations \
         -Wpadded -Wredundant-decls -Wunreachable-code -Wformat-nonliteral \
         -Wnested-externs -g -pedantic -ansi -O3