Currently, the Xcode generator uses "sourceTree = <absolute>" for
all PBXFileReferences. But the paths we use for referencing
libraries are relative. This patch will change this, so that we
always use absolute paths to be consequent.
This will fix a crash in Xcode that happens when opening
projects generated by Qt.
Change-Id: I3a372b93598a777c96ba353205cf19710a5923f5
Task-number: QTBUG-45966
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@theqtcompany.com>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@theqtcompany.com>