Qt5 C++ application compilation from prompt

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.