qt with vs2015 compiler generates pdb without line info

[yasincy]

I use qt creator to develop and add this in my .pro file
QMAKE_CFLAGS_RELEASE += /Zi
QMAKE_LFLAGS_RELEASE +=/DEBUG

to generate a pdb file. The compiler is msvc 2015.
But when I try to debug the crash poing in vs2015. I can get only the crash function, without line info.Such as:
CrashDialog::clickCrash(bool)

instead of
CrashDialog::clickCrash(bool) Line 32

What should I do to get the line info?