check_disable_warning -Wno-switch
check_disable_warning -Wno-format-zero-length
check_disable_warning -Wno-pointer-sign
-enabled extra_warnings || check_disable_warning -Wno-maybe-uninitialized
# add some linker flags
check_ldflags -Wl,--warn-common
check_cflags -Werror=missing-prototypes
check_cflags -Werror=return-type
check_cflags -Werror=vla
+ enabled extra_warnings || check_disable_warning -Wno-maybe-uninitialized
elif enabled llvm_gcc; then
check_cflags -mllvm -stack-alignment=16
elif enabled clang; then