Swift demo's rebuild when using multiple terminals

[externl]

Select a demo. In terminal A run swift build. When finished, run swift build in terminal B.

Swift will rebuild the demo.

[externl]

Seems this is an expected Swift behavior. Swift caches the environment and compares the hashes between runs. If you have env vars that change between terminal sessions, this can cause a rebuild.

https://forums.swift.org/t/building-non-ui-programs-e-g-command-line-tools-servers-etc/71368