Qt5 C++ application compilation from prompt

Robert M.

Still undefined reference problem.

jsulm

@Robert-M said in Qt5 C++ application compilation from prompt:

Still undefined reference problem

Why don't you post the command line which was used?

ChrisW67

@Robert-M What version of MingW g++ and make are in use to build the project? Is this the MingW tool chain that is installed by the Qt online installer or another copy? Is this exactly the same compiler that is defined and works in Qt Creator?

g++ --version
make --version

Robert M.

C:\Users\lenovo>g++ --version
g++ (i686-posix-dwarf-rev0, Built by MinGW-W64 project) 8.1.0
Copyright (C) 2018 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
C:\Users\lenovo>make --version
GNU Make 3.81
Copyright (C) 2006 Free Software Foundation, Inc.
Ten program jest darmowy; warunki kopiowania są opisane w źródłach.
Autorzy nie dają ŻADNYCH gwarancji, w tym nawet gwarancji SPRZEDAWALNOŚCI
lub PRZYDATNOŚCI DO KONKRETNYCH CELÓW.
Ten program został zbudowany dla i386-pc-mingw32

In Qt Creator I see:

C:\Qt\Tools\mingw730_32\bin\g++.exe
C:\Qt\Tools\mingw730_64\bin\g++.exe
C:\Qt\Tools\mingw900_64\bin\g++.exe

In make file I see:

####### Compiler, tools and options

CC = gcc
CXX = g++
DEFINES = -DUNICODE -D_UNICODE -DWIN32 -DMINGW_HAS_SECURE_API=1 -DQT_DEPRECATED_WARNINGS -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_CORE_LIB -DQT_NEEDS_QMAIN
CFLAGS = -fno-keep-inline-dllexport -g -Wall -W -Wextra $(DEFINES)
CXXFLAGS = -fno-keep-inline-dllexport -g -Wall -W -Wextra -fexceptions -mthreads $(DEFINES)
INCPATH = -I. -I........\Qt\5.13.2\mingw73_64\include -I........\Qt\5.13.2\mingw73_64\include\QtWidgets -I........\Qt\5.13.2\mingw73_64\include\QtGui -I........\Qt\5.13.2\mingw73_64\include\QtANGLE -I........\Qt\5.13.2\mingw73_64\include\QtCore -Idebug -I. -I/include -I........\Qt\5.13.2\mingw73_64\mkspecs\win32-g++
LINKER = g++
LFLAGS = -Wl,-subsystem,windows -mthreads
LIBS = C:\Qt\5.13.2\mingw73_64\lib\libQt5Widgetsd.a C:\Qt\5.13.2\mingw73_64\lib\libQt5Guid.a C:\Qt\5.13.2\mingw73_64\lib\libQt5Cored.a debug\dirtyphp-gui_resource_res.o -lmingw32 C:\Qt\5.13.2\mingw73_64\lib\libqtmaind.a -LC:\openssl\lib -LC:\Utils\my_sql\mysql-5.7.25-winx64\lib -LC:\Utils\postgresql\pgsql\lib -lshell32
QMAKE = C:\Qt\5.13.2\mingw73_64\bin\qmake.exe
IDC = idc
IDL = midl
ZIP = zip -r -9
DEF_FILE =
RES_FILE = debug\dirtyphp-gui_resource_res.o
COPY = copy /y
SED = $(QMAKE) -install sed
COPY_FILE = copy /y
COPY_DIR = xcopy /s /q /y /i
DEL_FILE = del
DEL_DIR = rmdir
MOVE = move
CHK_DIR_EXISTS= if not exist
MKDIR = mkdir
INSTALL_FILE = copy /y
INSTALL_PROGRAM = copy /y
INSTALL_DIR = xcopy /s /q /y /i
QINSTALL = C:\Qt\5.13.2\mingw73_64\bin\qmake.exe -install qinstall
QINSTALL_PROGRAM = C:\Qt\5.13.2\mingw73_64\bin\qmake.exe -install qinstall -exe

8Observer8

Try to use these commands:

qmake -makefile
mingw32-make
"./release/app"

.pro

QT += core gui widgets

CONFIG += c++11

SOURCES += \
    main.cpp

TARGET = app

It works with Qt6. Perhaps this will work with Qt5.

Edited 1/12/2023. Added widgets.

Robert M.

I created test.pro

C:\Users\lenovo\Projekty\dirtyphp_qt>C:\Qt\5.13.2\mingw73_64\bin\qmake.exe -makefile test.pro

C:\Users\lenovo\Projekty\dirtyphp_qt>mingw32-make
mingw32-make -f Makefile.Release
mingw32-make[1]: Entering directory 'C:/Users/lenovo/Projekty/dirtyphp_qt'
g++ -Wl,-s -Wl,-subsystem,windows -mthreads -o release\app.exe release/main.o C:\Qt\5.13.2\mingw73_64\lib\libQt5Gui.a C:\Qt\5.13.2\mingw73_64\lib\libQt5Core.a -lmingw32 C:\Qt\5.13.2\mingw73_64\lib\libqtmain.a -LC:\openssl\lib -LC:\Utils\my_sql\mysql-5.7.25-winx64\lib -LC:\Utils\postgresql\pgsql\lib -lshell32
release/main.o: file not recognized: File format not recognized
collect2.exe: error: ld returned 1 exit status
mingw32-make[1]: *** [Makefile.Release:65: release/app.exe] Error 1
mingw32-make[1]: Leaving directory 'C:/Users/lenovo/Projekty/dirtyphp_qt'
mingw32-make: *** [Makefile:38: release] Error 2

8Observer8

I don't know. I just post my result:

E:_Projects\Qt\test>mingw32-make
C:/Qt6/Tools/mingw810_64/bin/mingw32-make -f Makefile.Release
mingw32-make[1]: Entering directory 'E:/_Projects/Qt/test'
g++ -c -fno-keep-inline-dllexport -O2 -std=gnu++1z -Wall -Wextra -Wextra -fexceptions -mthreads -DUNICODE -D_UNICODE -DWIN32 -DMINGW_HAS_SECURE_API=1 -DQT_NO_DEBUG -DQT_GUI_LIB -DQT_CORE_LIB -DQT_NEEDS_QMAIN -I. -IC:/Qt6/6.2.0/mingw81_64/include -IC:/Qt6/6.2.0/mingw81_64/include/QtGui -IC:/Qt6/6.2.0/mingw81_64/include/QtCore -Irelease -I/include -IC:/Qt6/6.2.0/mingw81_64/mkspecs/win32-g++ -o release\main.o main.cpp
g++ -Wl,-s -Wl,-subsystem,windows -mthreads -o release\app.exe release/main.o C:\Qt6\6.2.0\mingw81_64\lib\libQt6Gui.a C:\Qt6\6.2.0\mingw81_64\lib\libQt6Core.a -lmingw32 C:\Qt6\6.2.0\mingw81_64\lib\libQt6EntryPoint.a -lshell32
mingw32-make[1]: Leaving directory 'E:/_Projects/Qt/test'

Robert M. · Edited 1/12/2023. Added `widgets`.

@8Observer8 said in Qt5 C++ application compilation from prompt:

mingw32-make

It does not work with Qt5 on my computer.
In file included from main.cpp:1:
mainwindow.h:4:10: fatal error: QMainWindow: No such file or directory
#include <QMainWindow>
^~~~~~~~~~~~~
compilation terminated.
mingw32-make[1]: *** [Makefile.Release:200: release/main.o] Error 1
mingw32-make[1]: Leaving directory 'C:/Users/lenovo/Projekty/dirtyphp_qt'
mingw32-make: *** [Makefile:38: release] Error 2

jsulm

@Robert-M said in Qt5 C++ application compilation from prompt:

mainwindow.h:4:10: fatal error: QMainWindow: No such file or directory

Add

QT += widgets

to your pro file as shown in documentation.

ChrisW67

@Robert-M said in Qt5 C++ application compilation from prompt:

C:\Users\lenovo>g++ --version
g++ (i686-posix-dwarf-rev0, Built by MinGW-W64 project) 8.1.0

OK. So when your make command invokes g++ it might be getting this version

In Qt Creator I see:
C:\Qt\Tools\mingw730_32\bin\g++.exe
C:\Qt\Tools\mingw730_64\bin\g++.exe
C:\Qt\Tools\mingw900_64\bin\g++.exe

And you appear to have two other g++ versions present on your machine

In make file I see:
CC = gcc
CXX = g++
...
INCPATH = -I. -I........\Qt\5.13.2\mingw73_64\include -I........\Qt\5.13.2\mingw73_64\include\QtWidgets -I........\Qt\5.13.2\mingw73_64\include\QtGui -I........\Qt\5.13.2\mingw73_64\include\QtANGLE -I........\Qt\5.13.2\mingw73_64\include\QtCore -Idebug -I. -I/include -I........\Qt\5.13.2\mingw73_64\mkspecs\win32-g++

The qmake command that built this makefile is expecting g++ to invoke version 7.3 64Bit and link against Qt libraries built with GCC 7.3 64Bit.
It is possible that GCC 7 and GCC 8 libraries are binary incompatible (do not know, haven't looked) and thisnis the cause of the link-time issue.

Try:

set PATH=C:\Qt\Tools\mingw730_64\bin;%PATH%
mingw32-make clean
mingw32-make

8Observer8

@jsulm said in Qt5 C++ application compilation from prompt:

QT += widgets

Sorry. I forgot about it.

QT += core gui widgets

Robert M.

@8Observer8
OK.
undefined reference

jsulm

@Robert-M said in Qt5 C++ application compilation from prompt:

undefined reference

Would you mind to provide more information or how are others supposed to help you based on that information?

8Observer8

@Robert-M, сould you show your current .pro file in full?

Robert M.

QT += core gui widgets

CONFIG += c++11

SOURCES +=
main.cpp

TARGET = app

ChrisW67

@Robert-M Have you tried forcing the correct compiler/linker as I requested a few days back?

Robert M.

@ChrisW67
Thanks for help. Program compiles without problem.