It's used at build time in 41 crates (6 directly).

Depender (with downloads and own rev deps) crate-git-revision version
6.6K 12 stellar-strkey build ^0.0.6
3.0K 13 stellar-xdr build ^0.0.6
2.4K 4 soroban-env-common build =0.0.6
2.4K 1 soroban-sdk-macros build ^0.0.6
400 1 soroban-cli build ^0.0.4
1 loam-soroban-cli build ^0.0.4