error LNK2019: unresolved external symbol DriverEntry referenced in function GsDriverEntry

 I was going with visual studio 2013 , wdk 8.1 and legacy kernel driver code.
Then, i faced a message LNK2019. It was not a problem in source code.


As you have got a following messages, when you had built a project.

1>------ Build started: Project: MyDriver1, Configuration: Win8.1 Debug x64 ------ 1>  Source.cpp 1>BufferOverflowFastFailK.lib(gs_driverentry.obj) : error LNK2019: unresolved external symbol DriverEntry referenced in function GsDriverEntry 1>C:\Users\Administrator\Desktop\helloworld\MyDriver1\x64\Win8.1Debug\MyDriver1.sys : fatal error LNK1120: 1 unresolved externals ========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ========== ========== Deploy: 0 succeeded, 0 failed, 0 skipped ==========

Basically, visual studio 2013 does not support C that is file extension .

To use C , you have to use statement 'extern c{}' like this.

P extern "C" { VOID Unload( _In_ struct _DRIVER_OBJECT *DriverObject ) ......... } }