JavaScriptCore.pro includes its pch from WebKit/qt/WebKit_pch.h, which displays a warning when compiling an extracted standalone JavaScriptCore. This is the simple solution, needed at least while we need JavaScriptCore to be compiled out of WebKit inside Qt. It would be possible to create a pch especially for JavaScriptCore to keep the compilation time reduction, however this may polute the directory (or any of the reason why WebKit_pch.h is currently in WebKit/qt/) Please have a thought about it while reviewing.
Created attachment 40618 [details] Patch
Created attachment 40620 [details] Patch v0.2 Better changelog message
Comment on attachment 40620 [details] Patch v0.2 r=me, that header isn't needed anymore for this .pro file.
Comment on attachment 40620 [details] Patch v0.2 Clearing flags on attachment: 40620 Committed r49128: <http://trac.webkit.org/changeset/49128>
All reviewed patches have been landed. Closing bug.