+SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${EXTRA_CFLAGS}")
+SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Werror -Wextra -fvisibility=hidden -fPIC")
+
+SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${EXTRA_CFLAGS} -O2 -Werror -Wextra -Wno-unused-parameter -Wno-missing-field-initializers -Wdeclaration-after-statement -Wmissing-declarations -Wredundant-decls -Wcast-align -Wcast-qual -Wall -Wno-array-bounds -Wno-empty-body -Wno-ignored-qualifiers -Wshadow -Wwrite-strings -Wswitch-default -Wno-unused-but-set-parameter -Wno-unused-but-set-variable")
+
+### Purge unused code ###
+SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fdata-sections -ffunction-sections -Wl,--gc-sections")