1、MSVC编译的库是xxx.dll和xxx.lib，MingW编译的库是libxxx.dll和libxxx.dll.a
其中lib文件和.a文件一般都是对dll的引导；或者是包含了所有的源码，作用和dll一样
2、Qt调用msvc的dll
INCLUDEPATH += C:/Users/Administrator/Desktop/new/CTK-master/build_msvc2017/CTK-build/Libs/PluginFramework INCLUDEPATH += C:/Users/Administrator/Desktop/new/CTK-master/build_msvc2017/CTK-build/Libs/Core LIBS += -LC:/Users/Administrator/Desktop/new/CTK-master/build_msvc2017/CTK-build/bin/Debug -lCTKCore -lCTKPluginFramework
INCLUDEPATH +是头文件路径
LIBS +是lib库路径，这个路径下需要同时有dll和lib文件
3、Qt调用mingw的dll
INCLUDEPATH += C:/Users/Administrator/Desktop/new/CTK-master/build_mingw64/CTK-build/Libs/PluginFramework INCLUDEPATH += C:/Users/Administrator/Desktop/new/CTK-master/build_mingw64/CTK-build/Libs/Core LIBS += -LC:/Users/Administrator/Desktop/new/CTK-master/build_mingw64/CTK-build/bin/ -llibCTKCore LIBS += -LC:/Users/Administrator/Desktop/new/CTK-master/build_mingw64/CTK-build/bin/ -llibCTKPluginFramework LIBS += C:/Users/Administrator/Desktop/new/CTK-master/build_mingw64/CTK-build/bin/libCTKCore.dll.a LIBS += C:/Users/Administrator/Desktop/new/CTK-master/build_mingw64/CTK-build/bin/libCTKPluginFramework.dll.a
原文：https://www.cnblogs.com/judes/p/13215464.html