QWT-6.20 In function WinMain: undefined reference to qMain Qt 5.15.2 mingw810_64

[Cedric-air]

I'm trying to compile qwt on Windows, like explained here:
https://qwt.sourceforge.io/qwtinstall.html

I've downloaded and extracted qwt, and then given these commands:

cd Downloads\qwt-6.2.0\qwt-6.2.0
qmake qwt.pro
mingw32-make

After a few seconds, I see this error:

mingw32-make[3]: Entering directory 'C:/Users/cedric/Downloads/qwt-6.2.0/qwt-6.2.0/tests/splinetest'
linking ../bin/splinetest.exe
C:\Qt\5.15.2\mingw81_64\lib\libqtmain.a(qtmain_win.o): In function `WinMain':
C:\Users\qt\work\qt\qtbase\src\winmain/qtmain_win.cpp:97: undefined reference to `qMain(int, char**)'
collect2.exe: error: ld returned 1 exit status
mingw32-make[3]: *** [Makefile.Release:68: ../bin/splinetest.exe] Error 1
mingw32-make[3]: Leaving directory 'C:/Users/cedric/Downloads/qwt-6.2.0/qwt-6.2.0/tests/splinetest'
mingw32-make[2]: *** [Makefile:49: release-all] Error 2
mingw32-make[2]: Leaving directory 'C:/Users/cedric/Downloads/qwt-6.2.0/qwt-6.2.0/tests/splinetest'
mingw32-make[1]: *** [Makefile:51: sub-splinetest-make_first] Error 2
mingw32-make[1]: Leaving directory 'C:/Users/cedric/Downloads/qwt-6.2.0/qwt-6.2.0/tests'
mingw32-make: *** [Makefile:314: sub-tests-make_first-ordered] Error 2

My versions:

qwt 6.2.0
qt 5.15.2
mingw810_64

[SGaist]

Hi and welcome to devnet,

Unless you are going to hack on Qwt, just disable the tests building.

[Cedric-air]

@SGaist Thank you, that solved it. After extracting the files, I edited qwt.pro, and commented out the lines that run the tests:

################################################################
# Qwt Widget Library
# Copyright (C) 1997   Josef Wilgen
# Copyright (C) 2002   Uwe Rathmann
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the Qwt License, Version 1.0
################################################################

lessThan(QT_MAJOR_VERSION, 5) {

    lessThan(QT_MINOR_VERSION, 8) {
        error(Qt >= 4.8 required.)
    }
}

include( qwtconfig.pri )

TEMPLATE = subdirs
CONFIG   += ordered

SUBDIRS = \
    src \
    classincludes \
    doc

contains(QWT_CONFIG, QwtDesigner ) {
    SUBDIRS += designer 
}

contains(QWT_CONFIG, QwtExamples ) {
    SUBDIRS += examples 
}

contains(QWT_CONFIG, QwtPlayground ) {
    SUBDIRS += playground 
}
 
#contains(QWT_CONFIG, QwtTests ) {
#    SUBDIRS += tests 
#}

qwtspec.files  = qwtconfig.pri qwtfunctions.pri qwt.prf
qwtspec.path  = $${QWT_INSTALL_FEATURES}

INSTALLS += qwtspec

After that the below steps run without problems:

qmake qwt.pro
mingw32-make -j 6
mingw32-make install