undefined reference to `_imp___ZN8mongocxx7v_noabi8instanceC1Ev in Qt?

[Vivek_A]

@jsulm ok, i understand idid this

LIBS += C:/mongo-cxx-driver/lib/libbsoncxx.dll.a

INCLUDEPATH += C:/mongo-cxx-driver/include/mongocxx/v_noabi
DEPENDPATH += C:/mongo-cxx-driver/include/mongocxx/v_noabi

included but error that said first remains

./release\main.o:main.cpp:(.text+0x1d): undefined reference to `_imp___ZN8mongocxx7v_noabi8instanceC1Ev'
./release\main.o:main.cpp:(.text+0xee): undefined reference to `_imp___ZN8mongocxx7v_noabi8instanceD1Ev'
./release\main.o:main.cpp:(.text+0x14e): undefined reference to `_imp___ZN8mongocxx7v_noabi8instanceD1Ev'

if you dont know about windows side of this , then its ok.
@JonB i have doubt , the compiler is mingw 32 and i build the mongdb in mingw 64 is this makes any issues

[jsulm]

@Vivek_A You need to link at least one more lib containing the missing symbols (libmongocxx I guess).

[JonB]

@Vivek_A said in undefined reference to `_imp___ZN8mongocxx7v_noabi8instanceC1Ev in Qt?:

LIBS += C:/mongo-cxx-driver/lib/libbsoncxx.dll.a

This looks much more reasonable than before!

Now as @jsulm says it looks like you need some further similars for other library files required to link successfully.

@JonB i have doubt , the compiler is mingw 32 and i build the mongdb in mingw 64 is this makes any issues

I am not sure what you are saying. It will not be possible to mix 64-bit-compiled code with 32-bit-compiled code in one executable. The compiler's bit-ness is not at issue, rather only whichever bit-ness it is generating code for.

Start by trying what @jsulm has pointed out, then deal with bit-ness if there is still an error.....

[Vivek_A]

@JonB modified

LIBS += C:/mongo-cxx-driver/lib/libbsoncxx.dll.a
LIBS += C:/mongo-cxx-driver/lib/libmongocxx.dll.a
INCLUDEPATH += C:/mongo-cxx-driver/include/mongocxx/v_noabi
DEPENDPATH += C:/mongo-cxx-driver/include/mongocxx/v_noabi

INCLUDEPATH += C:/mongo-cxx-driver/include/bsoncxx/v_noabi
DEPENDPATH += C:/mongo-cxx-driver/include/bsoncxx/v_noabi

clean & rebuilded
Output:

./release\main.o:main.cpp:(.text+0x19): undefined reference to `_imp___ZN8mongocxx7v_noabi8instanceC1Ev'
./release\main.o:main.cpp:(.text+0x23): undefined reference to `_imp___ZN8mongocxx7v_noabi8instanceD1Ev'
collect2.exe: error: ld returned 1 exit status

[Vivek_A]

@Vivek_A anybody help...is that compiler problem

./debug\main.o: In function `Z5qMainiPPc':
E:/vivek/dw_tdoa_controller7/dw_tdoa_controller/main.cpp:36: undefined reference to `_imp___ZN8mongocxx7v_noabi8instanceC1Ev'
E:/vivek/dw_tdoa_controller7/dw_tdoa_controller/main.cpp:36: undefined reference to `_imp___ZN8mongocxx7v_noabi8instanceD1Ev'
E:/vivek/dw_tdoa_controller7/dw_tdoa_controller/main.cpp:36: undefined reference to `_imp___ZN8mongocxx7v_noabi8instanceD1Ev'
collect2.exe: error: ld returned 1 exit status


Makefile:36: recipe for target 'debug' failed
mingw32-make[1]: *** [debug\RTLSController.exe] Error 1
mingw32-make: *** [debug] Error 2
17:25:51: The process "C:\Qt\Qt5.11.2\Tools\mingw530_32\bin\mingw32-make.exe" exited with code 2.
Error while building/deploying project dw_controller (kit: Desktop Qt 5.11.2 MinGW 32bit)
When executing step "Make"

[SGaist]

Try inverting the order of the libraries you are linking.

[Vivek_A]

@SGaist tried , still same error , i think its not in the linking of lib, may be the installation or compiler problem... what u think???

[mrjj]

@Vivek_A

Hi
I saw this line
building/deploying project dw_controller (kit: Desktop Qt 5.11.2 MinGW 32bit)

but you said " its build using mingw64 "

So are your 32 bit app trying to load 64 bit DLL ?

[Vivek_A]

@mrjj hi sir, i build and installed mongocxx driver using ming64. The app running in Qt is Desktop Qt 5.11.2 MinGW 32bit, ie a mingw 32 bit compiler

[SGaist]

The question is: did you build the MongoDB C++ library in 32 or 64 bit ?

If the later then you can't use them with to build a 32bit application. Beside compiler, architecture matters as well. You can't mix and match 32 and 64 bit when building librairies or applications.

[Vivek_A]

This post is deleted!

[Vivek_A]

my compiler is mingw32bit and mongocxx driver build in 64 bit . so thats make problem , i solved it by installing 64bit Qt.