error on build for qwt 6.1.6

SGaist

Hi,

From this feature request, you should use the 6.2 branch.

stdave

Ok - thanks for that. So I am now compiling and installing without errors. Next step is to get the qwt widgets to appear in Qt.
Here is where I stand;
Compiled and installed Qt into /usr/local/Qt version 5.15.2
Compiled qwt version (6.2.0) - using /usr/local/Qt/5.15.2/gcc_64/bin/qmake (checked using -v is 5.15.2)
Installed qwt into /usr/local/qwt-6.2.0-svn

This is a startup script I am using to get Qt up and running from the shell (so I can get some info)

QMAKEFEATURES=/usr/local/qwt-6.2.0-svn/features
QT_PLUGIN_PATH="/usr/local/qwt-6.2.0-svn/plugins:/usr/local/Qt/5.15.2/gcc_64/plugins"
QTDIR=/home/david/Qt
export QTDIR
export QT_PLUGIN_PATH
export QMAKEFEATURES
export QT_DEBUG_PLUGINS=1
/usr/local/Qt/Tools/QtCreator/bin/qtcreator

I put the plugin at;
/usr/local/Qt/5.15.2/gcc_64/plugins/designer/libqwt_designer_plugin.so

Here's something I found on old forums so I also did the following;

I inserted
/usr/local/qwt-6.2.0-svn/lib
into
/etc/ld.so.conf.d/qwt.conf
and updated with 'sudo ldconfig'

When I execute my shell file, I get quite a bit output - sending that through "grep qwt" I get;

QFactoryLoader::QFactoryLoader() checking directory path "/usr/local/qwt-6.2.0-svn/plugins/platforms" ...
QFactoryLoader::QFactoryLoader() checking directory path "/usr/local/qwt-6.2.0-svn/plugins/platformthemes" ...
QFactoryLoader::QFactoryLoader() checking directory path "/usr/local/qwt-6.2.0-svn/plugins/platforminputcontexts" ...
QFactoryLoader::QFactoryLoader() checking directory path "/usr/local/qwt-6.2.0-svn/plugins/xcbglintegrations" ...
QFactoryLoader::QFactoryLoader() checking directory path "/usr/local/qwt-6.2.0-svn/plugins/styles" ...
QFactoryLoader::QFactoryLoader() checking directory path "/usr/local/qwt-6.2.0-svn/plugins/sqldrivers" ...
QFactoryLoader::QFactoryLoader() checking directory path "/usr/local/qwt-6.2.0-svn/plugins/iconengines" ...
QFactoryLoader::QFactoryLoader() checking directory path "/usr/local/qwt-6.2.0-svn/plugins/imageformats" ...
QFactoryLoader::QFactoryLoader() checking directory path "/usr/local/qwt-6.2.0-svn/plugins/accessible" ...
QFactoryLoader::QFactoryLoader() checking directory path "/usr/local/qwt-6.2.0-svn/plugins/accessiblebridge" ...
QFactoryLoader::QFactoryLoader() checking directory path "/usr/local/qwt-6.2.0-svn/plugins/bearer" ...

I feel like I'm close - but still not there -

SGaist

Qt Creator is not designer. Start the Qt 5.15.2 designer and you'll likely see the Qwt widgets there.

stdave

OK - so, still closer, but a bug - I got this error;

Cannot load library /usr/local/Qt/5.15.2/gcc_64/plugins/designer/libqwt_designer_plugin.so: (/usr/local/Qt/5.15.2/gcc_64/plugins/designer/libqwt_designer_plugin.so: undefined symbol: _ZN17QwtDesignerPlugin18PolarPlotInterface12createWidgetEP7QWidget)

SGaist

What do you get if you run ldd on the plugin ?

stdave

$ ldd libqwt_designer_plugin.so

linux-vdso.so.1 (0x00007ffe464c5000)
libqwt.so.6.2 => /usr/local/qwt-6.2.0-svn/lib/libqwt.so.6.2 (0x00007f25ce791000)
libQt5Designer.so.5 => /usr/local/Qt/5.15.2/gcc_64/lib/libQt5Designer.so.5 (0x00007f25ce08f000)
libQt5Widgets.so.5 => /usr/local/Qt/5.15.2/gcc_64/lib/libQt5Widgets.so.5 (0x00007f25cd82d000)
libQt5Gui.so.5 => /usr/local/Qt/5.15.2/gcc_64/lib/libQt5Gui.so.5 (0x00007f25ccefc000)
libQt5Core.so.5 => /usr/local/Qt/5.15.2/gcc_64/lib/libQt5Core.so.5 (0x00007f25cc706000)
libstdc++.so.6 => /lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007f25cc510000)
libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007f25cc4f3000)
libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f25cc301000)
libQt5Svg.so.5 => /usr/local/Qt/5.15.2/gcc_64/lib/libQt5Svg.so.5 (0x00007f25cc0aa000)
libQt5OpenGL.so.5 => /usr/local/Qt/5.15.2/gcc_64/lib/libQt5OpenGL.so.5 (0x00007f25cbe53000)
libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f25cbd04000)
libQt5Xml.so.5 => /usr/local/Qt/5.15.2/gcc_64/lib/libQt5Xml.so.5 (0x00007f25cbac6000)
libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007f25cbaa1000)
libGL.so.1 => /lib/x86_64-linux-gnu/libGL.so.1 (0x00007f25cba19000)
libz.so.1 => /lib/x86_64-linux-gnu/libz.so.1 (0x00007f25cb9fd000)
libicui18n.so.56 => /usr/local/Qt/5.15.2/gcc_64/lib/libicui18n.so.56 (0x00007f25cb564000)
libicuuc.so.56 => /usr/local/Qt/5.15.2/gcc_64/lib/libicuuc.so.56 (0x00007f25cb1ac000)
libicudata.so.56 => /usr/local/Qt/5.15.2/gcc_64/lib/libicudata.so.56 (0x00007f25c97c7000)
libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007f25c97c1000)
libgthread-2.0.so.0 => /lib/x86_64-linux-gnu/libgthread-2.0.so.0 (0x00007f25c97bc000)
libglib-2.0.so.0 => /lib/x86_64-linux-gnu/libglib-2.0.so.0 (0x00007f25c9693000)
/lib64/ld-linux-x86-64.so.2 (0x00007f25ce983000)
libGLdispatch.so.0 => /lib/x86_64-linux-gnu/libGLdispatch.so.0 (0x00007f25c95db000)
libGLX.so.0 => /lib/x86_64-linux-gnu/libGLX.so.0 (0x00007f25c95a5000)
libpcre.so.3 => /lib/x86_64-linux-gnu/libpcre.so.3 (0x00007f25c9532000)
libX11.so.6 => /lib/x86_64-linux-gnu/libX11.so.6 (0x00007f25c93f5000)
libxcb.so.1 => /lib/x86_64-linux-gnu/libxcb.so.1 (0x00007f25c93cb000)
libXau.so.6 => /lib/x86_64-linux-gnu/libXau.so.6 (0x00007f25c93c5000)
libXdmcp.so.6 => /lib/x86_64-linux-gnu/libXdmcp.so.6 (0x00007f25c93bb000)
libbsd.so.0 => /lib/x86_64-linux-gnu/libbsd.so.0 (0x00007f25c93a1000)

SGaist

You may have to check the plugin code to see if there's something missing.

By the way, weren't you building with Qt 6 ?

stdave

@SGaist said in error on build for qwt 6.1.6:

You may have to check the plugin code to see if there's something missing.

By the way, weren't you building with Qt 6 ?

Originally I was - but things take a lot of twists and turns - I was getting errors building with the qmake from Qt6 - but that was with an older version of qwt - I tried several versions of qwt - all had the same compile problem, so I switched to a different version of Qt and have had more progress (so it seems).

Where exactly is the plugin code ? Are you talking about, for instance my shell script file - or maybe that I have plugin installed in /usr/local/Qt/5.15.2/gcc_64/plugins/designer - not sure if that should be there.

Oh, wait - you mean qwt. I can check that the configuration files I have been through and have not seen a reason to modify. Any suggestions as to what to look at?

SGaist

I would check the PolarPlot related stuff since it's from there that problem seems to be.

stdave

I recompiled qwt 6.2 with no errors. Tried a few different configuration. I removed the plugin file from within Qt.
Then I retried qwt-6.1.5 again and BINGO - the widgets are up and working. Thank you for your expert guidance on this.