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The prebuild stages headers into .build/headers as hard links, and skipped any target that already existed. A hard link shares an inode, so in-place edits propagate, but git checkout renames a new file over the source and gives it a new inode. The staged link then serves the old contents forever and setup never repairs it, so the build compiles against headers from whichever commit was checked out when the link was first created. The staging function now compares the staged file against its source and relinks it when the inodes differ. Targets a pass has already claimed are left alone, so sources that flatten onto the same target keep resolving to the first one visited, as before. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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Summary:
The iOS prebuild (
node scripts/ios-prebuild) stages React Native's headers intopackages/react-native/.build/headersas hard links, and skipped any target that already existed.When changing the original source files, these hard links can become stale and errors like this can occur:
This is a problem that contributors will see - not regular users, but the fix helps with strange error messages.
Changelog:
[INTERNAL] [FIXED] - Repair stale staged headers in the iOS prebuild instead of compiling against a previous checkout's copies
Test Plan:
✅ New unit tests, 16 cases in
packages/react-native/scripts/ios-prebuild/__tests__/setup-test.js, using real temporary directories rather than anfsmock, since the defect is about inodes.End to end on an Xcode 27 checkout:
node scripts/ios-prebuild -s -f Debugrestored it to the source inode and loggedLinked React/Base → .build/headers/React. The previous code skipped it.node scripts/ios-prebuild -b -f Debug -p ios-simulator→** BUILD SUCCEEDED **.