My understanding is that the majority of that is jemalloc, libbacktrace, and glibc. jemalloc can be replaced with system malloc easily, libbacktrace can be remo

My understanding is that the majority of that is jemalloc, libbacktrace, and glibc. jemalloc can be replaced with system malloc easily, libbacktrace can be removed by setting the compiler to interpret panics as aborts (which you need to do in a library used by C anyway, really), and glibc can be replaced with musl. This can bring binary size down to about 160kb for a binary which just does printf!(). Still not quite as good as C, but a lot better than default Rust with just a few tweaks.