rlibc is used at run time in 102 crates (of which 84 optionally). It is a direct run-time dependency in 15 crates. It's used only as a dev dependency in 8 crates (of which 1 directly).

Depender (with downloads and own rev deps) rlibc version
12K 39 ink_env ^1
700 2 sel4-sys ^1.0.0
410 rlibc-ext ^1.0.0
240 amber ^1
900 17 mech-core optional =1.0
800 5 mech-syntax optional =1.0
lambdaOS ^1.0
efi ^1.0.0
1 enclave ^1.0.0
libsel4-sys ^1.0
owasm-libc ^1.0
processortrace ^1.0.0
1 ruspiro-allocator ~1.0.0
rustboot ^1
waveform optional ^1.0.0
ntrumls-plus dev ^1.0.0