RESOLVED FIXED317875
[CMake] Build fails with ObjC type redefinition errors with multiple WebKit checkouts 
https://bugs.webkit.org/show_bug.cgi?id=317875
Summary [CMake] Build fails with ObjC type redefinition errors with multiple WebKit c...
Qianlang Chen
Reported 2026-06-25 14:34:27 PDT
1. Clone WebKit into two separate directories, e.g. ~/WebKitA and ~/WebKitB. 2. Build ~/WebKitA with the cmake preset (e.g. `cmake --preset mac-dev-release && cmake --build --preset mac-dev-release`). 3. Build ~/WebKitB the same way, which may fail with: RTCVideoFrame.h: error: redefinition of 'RTCVideoRotation' /Users/.../WebKitA/OpenSource/.../RTCVideoFrame.h: note: previous definition is here Where the paths point at the other checkout, not the one being built. 4. Deleting ~/WebKitB's cmake build directory and rebuilding does not help because ccache intercepts the PCH compilation step before the compiler even runs, returning the cached result every time.
Attachments
Add attachment proposed patch, testcase, etc.
Qianlang Chen
Comment 1 2026-06-25 14:47:04 PDT
https://github.com/WebKit/WebKit/pull/67893
EWS
Comment 2 2026-06-25 16:05:19 PDT
Committed 315854@main (e4b1a3ecdf51): <https://commits.webkit.org/315854@main> Reviewed commits have been landed. Closing PR #67893 and removing active labels.
Radar WebKit Bug Importer
Comment 3 2026-06-25 16:06:15 PDT
<rdar://problem/180665813>
Note You need to log in before you can comment on or make changes to this bug.