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Here is a preface - I have a C++ + Qt application, it consists of several projects and we are using MSVC 2012 to build it. Now, I'm implementing build scripts to start deploying build server. So, I started creating Qt .pro files for each and every project we have.

**Now the problem** - we use Crypto++ library(http://www.cryptopp.com/) which we build from source code and the output is static lib, and we have DLL which depends on cryptlib.lib.

I wrote .pro file for Cryptlib and I'm able to build it using qmake/jom

Qt Code: 
  1. QT           -= core gui
  2.     QMAKE_CFLAGS += /Zc:wchar_t
  3.  
  4.     TEMPLATE = lib
  5.     TARGET   = cryptlib
  6.  
  7.     Release:DESTDIR = ./Release
  8.     Debug:DESTDIR   = ./Debug
  9.  
  10.     CONFIG  += staticlib precompile_header
  11.     DEFINES += _USING_V110_SDK71_ WINVER=0x0501 WIN32 _WINDOWS _MBCS
  12.     DEFINES -= UNICODE
  13.  
  14.     PRECOMPILED_HEADER = pch.h
  15.     DEPENDPATH += .
  16.  
  17.     include(CryptoPP.pri)@
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I wrote .pro file for my DLL - it compiles fine, *but I'm getting linker errors on linkage phase*. The most interesting thing is that when I build cryptlib with MSVC2012 and *then* build DLL with qmake - then it link OK.

What could be wrong? I checked all proj settings in MSVC projects and applied in my pro files. I checked names mangling in both libs built with MSVC and QT - mangled names look the same. Now I got stuck

Qt Code: 
  1. @# ----------------------------------------------------
  2.     # This file is generated by the Qt Visual Studio Add-in.
  3.     # ------------------------------------------------------
  4.  
  5.     QT           -= gui core
  6.     QMAKE_CFLAGS += /Zc:wchar_t
  7.  
  8.     TEMPLATE = lib
  9.     TARGET   = PSGLicensing
  10.  
  11.     Release:DESTDIR = ./Release
  12.     Debug:DESTDIR   = ./Debug
  13.  
  14.     CONFIG  += dll
  15.     DEFINES += _AFXDLL _USING_V110_SDK71_ WIN32 _WINDOWS _WINDLL _USRDLL DLL_LIBRARY PSGLICENSING_DLL_BUILD _MBCS _VC80_UPGRADE=0x0710
  16.     DEFINES -= UNICODE
  17.  
  18.     PRECOMPILED_HEADER = stdafx.h
  19.     DEPENDPATH += .
  20.  
  21.     win32:CONFIG(release, debug|release): LIBS += -L$$_PRO_FILE_PWD_/../CryptoPP/Release/ -lcryptlib
  22.     else:win32:CONFIG(debug, debug|release): LIBS += -L$$_PRO_FILE_PWD_/../CryptoPP/Debug/ -lcryptlib
  23.  
  24.     INCLUDEPATH += $$_PRO_FILE_PWD_/../CryptoPP/
  25.     DEPENDPATH += $$_PRO_FILE_PWD_/../CryptoPP/
  26.  
  27.     win32:CONFIG(release, debug|release): PRE_TARGETDEPS += $$_PRO_FILE_PWD_/../CryptoPP/Release/cryptlib.lib
  28.     else:win32:CONFIG(debug, debug|release): PRE_TARGETDEPS += $$_PRO_FILE_PWD_/../CryptoPP/Debug/cryptlib.lib
  29.  
  30.     include(PSGLicensing.pri)@
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In MSVC2012 we have following settings for

**CryptLib**

Qt Code: 
  1. *Compiler:* /Yu"pch.h" /GS /GL /analyze- /W3 /Gy- /Zc:wchar_t /Zi /Gm- /O2 /Ob2 /Fd"Release\vc110.pdb" /fp:precise /Zp1 /D "_USING_V110_SDK71_" /D "NDEBUG" /D "_WINDOWS" /D "USE_PRECOMPILED_HEADERS" /D "WIN32" /D "WINVER=0x0501" /D "_VC80_UPGRADE=0x0710" /errorReport:prompt /GF- /WX- /Zc:forScope /arch:SSE /Gd /Oy /Oi /MD /Fa"Release\" /EHsc /nologo /Fo"Release\" /Fp"Release\cryptlib.pch" 
  2.  
  3.     *Linker:* /OUT:"SecretPath\CryptoPP\Release\cryptlib.lib" /LTCG /NOLOGO
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and here are settings for **DLL**

Qt Code: 
  1. *Compiler*: /Yu"stdafx.h" /GS /analyze- /W3 /Zc:wchar_t /I"SecretPath\PSGLicensing\IncludeExp" /Zi /Gm- /O2 /Fd"Release\vc110.pdb" /fp:precise /D "_USING_V110_SDK71_" /D "WIN32" /D "_WINDOWS" /D "NDEBUG" /D "_USRDLL" /D "PSGLICENSING_DLL_BUILD" /D "_VC80_UPGRADE=0x0710" /D "_WINDLL" /D "_MBCS" /D "_AFXDLL" /errorReport:prompt /WX- /Zc:forScope /Gd /Oy- /MD /Fa"Release\" /EHsc /nologo /Fo"Release\" /Fp"Release\PSGLicensing.pch" 
  2.  
  3.     *Linker:* /OUT:"SecretPah\PSGLicensing\Release\PSGLicensing.dll" /MANIFEST /PDB:"SecretPath\PSGLicensing\Release\PSGLicensing.pdb" /DYNAMICBASE:NO "..\CryptoPP\Release\cryptlib.lib" "SecretPath\CryptoPP\Release\cryptlib.lib" /DEF:".\PSGLicensing.def" /IMPLIB:"SecretPath\PSGLicensing\Release\PSGLicensing.lib" /DEBUG /DLL /MACHINE:X86 /OPT:REF /SAFESEH /INCREMENTAL:NO /PGD:"SecretPath\PSGLicensing\Release\PSGLicensing.pgd" /SUBSYSTEM:WINDOWS",5.01" /MANIFESTUAC:"level='asInvoker' uiAccess='false'" /ManifestFile:"Release\PSGLicensing.dll.intermediate.manifest" /OPT:ICF /ERRORREPORT:PROMPT /NOLOGO /TLBID:1
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Here is jom output

Qt Code: 
  1. @	C:\Qt\Qt5.2.1\Tools\QtCreator\bin\jom.exe -f Makefile.Release
  2.     	link /NOLOGO /DYNAMICBASE /NXCOMPAT /INCREMENTAL:NO /DLL /MANIFEST /MANIFESTFILE:Release\PSGLicensing.dll.embed.manifest /OUT:Release\PSGLicensing.dll @C:\Users\ANDRIY~1.GLO\AppData\Local\Temp\PSGLicensing.dll.6212.16.jom
  3.        Creating library Release\PSGLicensing.lib and object Release\PSGLicensing.exp
  4.     GenerateRandomBlock.obj : error LNK2001: unresolved external symbol "public: virtual void __thiscall CryptoPP::CFB_CipherTemplate<class CryptoPP::AbstractPolicyHolder<class CryptoPP::CFB_CipherAbstractPolicy,class CryptoPP::CFB_ModePolicy> >::ProcessData(unsigned char *,unsigned char const *,unsigned int)" (?ProcessData@?$CFB_CipherTemplate@V?$AbstractPolicyHolder@VCFB_CipherAbstractPolicy@CryptoPP@@VCFB_ModePolicy@2@@CryptoPP@@@CryptoPP@@UAEXPAEPBEI@Z)
  5.     GenerateRandomBlock.obj : error LNK2001: unresolved external symbol "public: virtual void __thiscall CryptoPP::CFB_CipherTemplate<class CryptoPP::AbstractPolicyHolder<class CryptoPP::CFB_CipherAbstractPolicy,class CryptoPP::CFB_ModePolicy> >::Resynchronize(unsigned char const *,int)" (?Resynchronize@?$CFB_CipherTemplate@V?$AbstractPolicyHolder@VCFB_CipherAbstractPolicy@CryptoPP@@VCFB_ModePolicy@2@@CryptoPP@@@CryptoPP@@UAEXPBEH@Z)
  6.     GenerateRandomBlock.obj : error LNK2001: unresolved external symbol "protected: virtual void __thiscall CryptoPP::CFB_CipherTemplate<class CryptoPP::AbstractPolicyHolder<class CryptoPP::CFB_CipherAbstractPolicy,class CryptoPP::CFB_ModePolicy> >::UncheckedSetKey(unsigned char const *,unsigned int,class CryptoPP::NameValuePairs const &)" (?UncheckedSetKey@?$CFB_CipherTemplate@V?$AbstractPolicyHolder@VCFB_CipherAbstractPolicy@CryptoPP@@VCFB_ModePolicy@2@@CryptoPP@@@CryptoPP@@MAEXPBEIABVNameValuePairs@2@@Z)
  7.  
  8. ...
  9.  
  10.     Release\PSGLicensing.dll : fatal error LNK1120: 16 unresolved externals
  11.     @
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