Hi everyone,
We run our CI builds on a Mac mini. On my local MacBook, incremental builds work properly and build times are fast, but on CI it looks like Xcode rebuilds everything from scratch every time, and the build is about 6 minutes slower than local.
In Xcode 26, “compilation caching” became available. My understanding was that if DerivedData is preserved between CI runs, compilation caching / incremental builds should reduce build time.
So I tried specifying the DerivedData path as an absolute path in our xcodebuild command to reuse it across builds. However, it still seems to do a full rebuild every time and the build time didn’t improve.
Has anyone seen a similar issue with incremental builds on CI (Mac mini) with Xcode 26? Any advice on what to check or how to configure CI so incremental builds / caching actually work would be greatly appreciated.
Thanks!