How to link an .obj-File in the build process of Qt (qmake)
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QT -= gui CONFIG += c++11 console CONFIG -= app_bundle # The following define makes your compiler emit warnings if you use # any feature of Qt which as been marked deprecated (the exact warnings # depend on your compiler). Please consult the documentation of the # deprecated API in order to know how to port your code away from it. DEFINES += QT_DEPRECATED_WARNINGS # You can also make your code fail to compile if you use deprecated APIs. # In order to do so, uncomment the following line. # You can also select to disable deprecated APIs only up to a certain version of Qt. #DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000 # disables all the APIs deprecated before Qt 6.0.0 SOURCES += main.cpp DISTFILES += \ gpib-32.obj HEADERS += \ ni488.h -
@aha_1980
Okay, again a bit slower.
I have to rename my gpib-32.obj to gpib-32.lib and then add it as a library?
That doesn't help.You talked about the ni4882.obj. I have that as well together with nisyscfg.lib. But changing ni4882.obj to ni4882.lib and adding this doesn't help as well. For that I created another project and included ni4882.h and used the same code.
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Hi @MarekG,
@aha_1980
Okay, again a bit slower.Well...
I have to rename my gpib-32.obj to gpib-32.lib and then add it as a library?
That doesn't help.I didn't use gpib-32 but used ni4882 instead. Don't know if there is much difference.
You talked about the ni4882.obj. I have that as well together with nisyscfg.lib. But changing ni4882.obj to ni4882.lib and adding this doesn't help as well. For that I created another project and included ni4882.h and used the same code.
How did you add it? When I added the line
LIBS += -L/path/to/objectfile -lni4882in my pro file it only worked for me if I renamed ni4882.obj to ni4882.lib.Which error do you get? (Or better: post the compiler and linker commands from the compile output).
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Hi @aha_1980 ,
okay, I made a new Project with ni4882.h
#include <QCoreApplication> #include <windows.h> #include "ni4882.h" int main(int argc, char *argv[]) { QCoreApplication a(argc, argv); unsigned int test; test = ibconfig (1,2,3); return a.exec(); }And my project file:
QT -= gui CONFIG += c++11 console CONFIG -= app_bundle # The following define makes your compiler emit warnings if you use # any feature of Qt which as been marked deprecated (the exact warnings # depend on your compiler). Please consult the documentation of the # deprecated API in order to know how to port your code away from it. DEFINES += QT_DEPRECATED_WARNINGS # You can also make your code fail to compile if you use deprecated APIs. # In order to do so, uncomment the following line. # You can also select to disable deprecated APIs only up to a certain version of Qt. #DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000 # disables all the APIs deprecated before Qt 6.0.0 SOURCES += main.cpp \ main.cpp HEADERS += \ ni4882.h LIBS += -L/. -lni4882I also tried to add the library by right click and "Add library". But it doesn't change anything.
Still the same Linker Error: LNK2019 unresolved external symbol _ibconfig@12 referenced in function _main
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@MarekG said in How to link an .obj-File in the build process of Qt (qmake):
LIBS += -L/. -lni4882
Where is your
ni4882.liblocated? In the source directory? That does not help for shadow builds :(Try:
LIBS += -L$$PWD -lni4882It must work :)
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@aha_1980 And again :(
I tried
LIBS += -L$$PWD -lni4882-> It didn't work.
I tried to copy the lib-file into the debug folder -> It didn't work.
I tried to add it by right click when it's in the debug folder:win32:CONFIG(release, debug|release): LIBS += -L$$PWD/../build-test_dg2030_1-Desktop_Qt_5_10_1_MSVC2015_32bit-Debug/release/ -lni4882 else:win32:CONFIG(debug, debug|release): LIBS += -L$$PWD/../build-test_dg2030_1-Desktop_Qt_5_10_1_MSVC2015_32bit-Debug/debug/ -lni4882 INCLUDEPATH += $$PWD/../build-test_dg2030_1-Desktop_Qt_5_10_1_MSVC2015_32bit-Debug/debug DEPENDPATH += $$PWD/../build-test_dg2030_1-Desktop_Qt_5_10_1_MSVC2015_32bit-Debug/debug win32-g++:CONFIG(release, debug|release): PRE_TARGETDEPS += $$PWD/../build-test_dg2030_1-Desktop_Qt_5_10_1_MSVC2015_32bit-Debug/release/libni4882.a else:win32-g++:CONFIG(debug, debug|release): PRE_TARGETDEPS += $$PWD/../build-test_dg2030_1-Desktop_Qt_5_10_1_MSVC2015_32bit-Debug/debug/libni4882.a else:win32:!win32-g++:CONFIG(release, debug|release): PRE_TARGETDEPS += $$PWD/../build-test_dg2030_1-Desktop_Qt_5_10_1_MSVC2015_32bit-Debug/release/ni4882.lib else:win32:!win32-g++:CONFIG(debug, debug|release): PRE_TARGETDEPS += $$PWD/../build-test_dg2030_1-Desktop_Qt_5_10_1_MSVC2015_32bit-Debug/debug/ni4882.libAnd when it's in the source directory:
win32: LIBS += -L$$PWD/./ -lni4882 INCLUDEPATH += $$PWD/. DEPENDPATH += $$PWD/. win32:!win32-g++: PRE_TARGETDEPS += $$PWD/./ni4882.lib else:win32-g++: PRE_TARGETDEPS += $$PWD/./libni4882.aBut nothing helps :(
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No, much to complicated - it's really that simple as I posted.
Please post the compiler&linker output -> we need to know where the linker is searching for the additional files.
And one hint: avoid '/' at the end of a path -> it converts to a backslash in Windows and I have seen strange things happen.
I need to leave now. Good luck!
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Okay, I don't know what happened, but I created another project and tried everything again. It worked now without any error :)
So to summarize: I included "ni4882.h" and added the library "ni4882.lib" (renamed from ni4882.obj)
Thank you everyone for your help ;)
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@mranger90 said in How to link an .obj-File in the build process of Qt (qmake):
Does adding something like this to your profile work ?
OBJECTS_DIR += $$PWD OBJECTS += objtest.oObviously I tried this on Linux, so drop the ".o" and you may need to replace it with ".obj"
Hi @mranger90,
ni4882.obj is not really a object, but a linker input file. The real functions are in ni4882.dll. So using
LIBSis the correct way, the only strange thing is that the linker input file uses the extension.obj. But this can easily be fixed by renaming.Regards.
