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I infer from your reply:

EXE links to ABC.LIB only, and no other libs.
ABC.DLL statically links with SDK.LIB
../lib/SIPEvent.lib' - linked in ABC.DLL or the EXE? Or Both??
Don't fiddle with...

I am confused!

'../lib/SIPEvent.lib'
SDK.LIB, SDK.DLL
ABC.DL
Please explain! which of these are Static libs?

That does not remove /LTCG. In General look at the last option named 'Whole Program Optimization.

You do not need to same version .LIB to use in your application.
Assume for example, you have DLL and LIB file which was built using VC8 (or say VC6). You still can use it in VC8, VC9, CV10.

You...

Try removing /LTGC.