It's used at build time in 69 crates (of which 1 optionally, 13 directly).

Depender (with downloads and own rev deps) crate-git-revision version
12K 20 stellar-strkey build ^0.0.6
10K 25 stellar-xdr build ^0.0.6
8.8K 4 soroban-env-common build =0.0.6
6.7K 1 soroban-sdk-macros build ^0.0.6
850 3 soroban-cli build ^0.0.4
410 hcnet-xdr build ^0.0.6
110 1 hcnet-strkey build ^0.0.6
loam-soroban-cli build ^0.0.4
soroban-cli-hcnet-test build ^0.0.4
soroban-cli-hcnet-test1 build ^0.0.4
soroban-cli-hcnet-test2 build ^0.0.4
soroban-cli-hcnet-test3 build ^0.0.4
soroban-cli-stellar-test build ^0.0.4