{ lib }:

{
	optimizationLevel ? "O3",
	enableLTO ? true,
	enableNativeOptimizations ? true,
	additionalFlags ? []
}:

pkg:

assert builtins.elem optimizationLevel [ "O0" "O1" "O2" "O3" "Ofast" "Os" "Oz" "Og" ];

let
	flags = [ "-${optimizationLevel}" ]
			++ lib.optional enableLTO "-flto"
			++ lib.optional enableNativeOptimizations "-march=native"
			++ additionalFlags;
in

pkg.overrideAttrs (prevAttrs: {
	env.NIX_CFLAGS_COMPILE = (prevAttrs.env.NIX_CFLAGS_COMPILE or "")
							 + lib.strings.concatStringsSep " " flags;
})