The following should be fixed:
/home/gavin/dev/hpcc/dali/ft/daftformat.ipp: In member function ‘virtual void CJsonInputPartitioner::findSplitPoint(offset_t, PartitionCursor&)’:
/home/gavin/dev/hpcc/dali/ft/daftformat.ipp:547:48: warning: ‘prevRowEnd’ may be used uninitialized in this function [-Wmaybe-uninitialized]
cursor.trimLength = json->rowStart - prevRowEnd;
I didn't fix it myself, because it looked like the return value from findRowEnd() should possibly be tested.