unresolved symbols building with MinGW-w64 make.exe

[bonhamp]

Getting all your source tree and opening up your CMakeLists.txt file in Qt Creator v4.7.1, and specifying a kit for MinGW-w64,

• the CMake parsing succeeds
• the make fails with following unresolved symbols:
  16:21:33: Running steps for project Project...
  16:21:33: Starting: "C:\Program Files\CMake\bin\cmake.exe" --build . --target all
  [ 16%] Automatic MOC and UIC for target MinimalQml
  [ 16%] Built target MinimalQml_autogen
  [ 33%] Linking CXX executable MinimalQml.exe
  CMakeFiles\MinimalQml.dir/objects.a(main.cpp.obj):main.cpp:(.text$_ZN7QStringD1Ev[_ZN7QStringD1Ev]+0x26): undefined reference to __imp__ZN10QArrayData10deallocateEPS_yy' CMakeFiles\MinimalQml.dir/objects.a(main.cpp.obj):main.cpp:(.text.startup+0x39): undefined reference to __imp__ZN12QApplicationC1ERiPPci'
  CMakeFiles\MinimalQml.dir/objects.a(main.cpp.obj):main.cpp:(.text.startup+0x44): undefined reference to __imp__ZN21QQmlApplicationEngineC1EP7QObject' CMakeFiles\MinimalQml.dir/objects.a(main.cpp.obj):main.cpp:(.text.startup+0x69): undefined reference to __imp__ZN4QUrlC1ERK7QStringNS_11ParsingModeE'
  CMakeFiles\MinimalQml.dir/objects.a(main.cpp.obj):main.cpp:(.text.startup+0x75): undefined reference to __imp__ZN21QQmlApplicationEngine4loadERK4QUrl' CMakeFiles\MinimalQml.dir/objects.a(main.cpp.obj):main.cpp:(.text.startup+0x7e): undefined reference to __imp__ZN4QUrlD1Ev'
  CMakeFiles\MinimalQml.dir/objects.a(main.cpp.obj):main.cpp:(.text.startup+0x8c): undefined reference to __imp__ZN12QApplication4execEv' CMakeFiles\MinimalQml.dir/objects.a(main.cpp.obj):main.cpp:(.text.startup+0x97): undefined reference to __imp__ZN21QQmlApplicationEngineD1Ev'
  CMakeFiles\MinimalQml.dir/objects.a(main.cpp.obj):main.cpp:(.text.startup+0xa0): undefined reference to __imp__ZN12QApplicationD1Ev' CMakeFiles\MinimalQml.dir/objects.a(main.cpp.obj):main.cpp:(.text.startup+0xb9): undefined reference to __imp__ZN12QApplicationD1Ev'
  CMakeFiles\MinimalQml.dir/objects.a(main.cpp.obj):main.cpp:(.text.startup+0xcd): undefined reference to __imp__ZN21QQmlApplicationEngineD1Ev' CMakeFiles\MinimalQml.dir/objects.a(main.cpp.obj):main.cpp:(.text.startup+0xdb): undefined reference to __imp__ZN4QUrlD1Ev'
  CMakeFiles\MinimalQml.dir/objects.a(qrc_qml.cpp.obj):qrc_qml.cpp:(.text+0x3f): undefined reference to qRegisterResourceData(int, unsigned char const*, unsigned char const*, unsigned char const*)' CMakeFiles\MinimalQml.dir/objects.a(qrc_qml.cpp.obj):qrc_qml.cpp:(.text+0x6f): undefined reference to qUnregisterResourceData(int, unsigned char const*, unsigned char const*, unsigned char const*)'
  CMakeFiles\MinimalQml.dir/objects.a(qrc_qml.cpp.obj):qrc_qml.cpp:(.text+0x1b): undefined reference to qUnregisterResourceData(int, unsigned char const*, unsigned char const*, unsigned char const*)' CMakeFiles\MinimalQml.dir/objects.a(qrc_qml.cpp.obj):qrc_qml.cpp:(.text.startup+0x1f): undefined reference to qRegisterResourceData(int, unsigned char const*, unsigned char const*, unsigned char const*)'
  collect2.exe: error: ld returned 1 exit status
  mingw32-make.exe[2]: *** [src\CMakeFiles\MinimalQml.dir\build.make:129: src/MinimalQml.exe] Error 1
  mingw32-make.exe[1]: *** [CMakeFiles\Makefile2:91: src/CMakeFiles/MinimalQml.dir/all] Error 2
  mingw32-make.exe: *** [Makefile:83: all] Error 2
  16:21:34: The process "C:\Program Files\CMake\bin\cmake.exe" exited with code 2.

[Postrediori]

Hi!

Those messages show that CMake paths for Qt/MinGW are mis-configured. Could you specify the way you installed Qt/MinGW and the versions you are using?

I tried to compile the project with CMake 3.13.2 with Qt 5.12.0/Qt Creator 4.8.0/MinGW 7.3.0 from the official bundle and build completes fine.

[bonhamp]

Hi Rasim, I think I found out the issue. The build you are doing that works must be a 32-bit build. I am trying to do a 64-bit build. The issue is that Qt does not provide 64 bit dlls and libs that are compatible with MinGW-w64. Apparently up to version 5.5 of Qt there was a side project called Qt64-NG that was providing these needed binaries, but that project has now been abandoned. I have no idea why. It is all explained in this link: https://stackoverflow.com/questions/38335424/how-to-use-mingw-64-with-qt-creator That post is 2 years old but the situation is still apparently the same. I installed Qt Creator 4.7.1 and the only minGW binaries it provides are 32 bit. So this is not an issue with your project, it is a Qt/minGW issue. Thanks.

…

On Mon, Dec 31, 2018 at 9:54 AM Rasim Labibov ***@***.***> wrote: Hi! Those messages show that CMake paths for Qt/MinGW are mis-configured. Could you specify the way you installed Qt/MinGW and the versions you are using? I tried to compile the project with CMake 3.13.2 with Qt 5.12.0/Qt Creator 4.8.0/MinGW 7.3.0 from the official bundle <https://download.qt.io/archive/qt/5.12/> and build completes fine. [image: 1] <https://user-images.githubusercontent.com/856993/50562373-0d9ab980-0d1c-11e9-8866-a72b42729173.png> — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#1 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/ArpWBOsMQpx28kFze4nKsaMUQhJj0WIUks5u-iULgaJpZM4Zku3W> .

-- ------------------------------------------- Paul Bonham Software Development Engineer *MultiSensor Scientific, Inc* 444 Somerville Ave Somerville, MA 02143 Mobile: +1 ( <7817991507>603) 568-0096 www.multisensorscientific.com

[Postrediori]

Hi,

Thanks for your clarification. I'm surprised that Qt Team doesn't distribute x64 libraries for MinGW, since they are shipping libraries to a number of platforms hence the 'cross-platform framework'.

I'll close this issue then. There are instructions for Windows that I plan to commit soon and I think the information about x64 MinGW is worth to be added there.

Thanks.