Linker errors when building DLL dependent on static lib(Crypto++)

[DPbIH]

Somehow, I got it solved. Here is the version of .pro file for CryptLib with which built library is linkable.

QT           -= core gui
    QMAKE_CFLAGS += /Zc:wchar_t /GL
 
    TEMPLATE = lib
    TARGET   = cryptlib
 
    Release:DESTDIR = ./Release
    Debug:DESTDIR   = ./Debug
 
    CONFIG  += staticlib
    DEFINES += _USING_V110_SDK71_ WINVER=0x0501 WIN32 _WINDOWS _MBCS USE_PRECOMPILED_HEADERS
    DEFINES -= UNICODE
 
    DEPENDPATH += .
 
    include(CryptoPP.pri)

QT           -= core gui
    QMAKE_CFLAGS += /Zc:wchar_t /GL
    
    TEMPLATE = lib
    TARGET   = cryptlib
    
    Release:DESTDIR = ./Release
    Debug:DESTDIR   = ./Debug
    
    CONFIG  += staticlib
    DEFINES += _USING_V110_SDK71_ WINVER=0x0501 WIN32 _WINDOWS _MBCS USE_PRECOMPILED_HEADERS
    DEFINES -= UNICODE
    
    DEPENDPATH += .
    
    include(CryptoPP.pri)

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So, all I did is added **USE_PRECOMPILED_HEADERS** to DEFINES and removed **PRECOMPILED_HEADER_FILE = pch.h**. I do not know how it actually helped, but it helped.