[QGIS-Developer] moc_vectorlayer.cpp can't be create in vs2015

[weskerjiang at sina.cn]

Hello:
     I'm using QGIS-master to build QGIS, i use  vs2015  
 msvc2015 x86 ,python 3.6, qt5 and other requirements,everything is 
ok,but when i build it in vs2015,the moc_vectorlayer.cpp is empty,so 
there comes a lot of errors like the image below.so who can tell me why 
moc_vectorlayer.cpp is empty,thanks


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