Compile QWT for ARM linux

[zuoshulu]

I am writing an application using qwt runs on arm Linux, QWT was complied successfully, and I was able to compile and run my program using QwtPlot runs on Desktop Ubuntu 11.04. However, I got the following error while compiling to arm.

root@zuoshu-laptop:/home/zuoshu/qtProjects/QtGUIsample# make
/opt/qt-4.7.1/bin/uic mainwindow.ui -o ui_mainwindow.h
arm-linux-g++ -c -pipe -O2 -Wall -W -D_REENTRANT -DQT_NO_DEBUG -DQT_GUI_LIB -DQT_NETWORK_LIB -DQT_CORE_LIB -DQT_SHARED -I/opt/qt-4.7.1/mkspecs/qws/linux-arm-g++ -I. -I/opt/qt-4.7.1/include/QtCore -I/opt/qt-4.7.1/include/QtNetwork -I/opt/qt-4.7.1/include/QtGui -I/opt/qt-4.7.1/include -I/usr/local/qwt-6.0.1/include -I. -I. -o main.o main.cpp
arm-linux-g++ -c -pipe -O2 -Wall -W -D_REENTRANT -DQT_NO_DEBUG -DQT_GUI_LIB -DQT_NETWORK_LIB -DQT_CORE_LIB -DQT_SHARED -I/opt/qt-4.7.1/mkspecs/qws/linux-arm-g++ -I. -I/opt/qt-4.7.1/include/QtCore -I/opt/qt-4.7.1/include/QtNetwork -I/opt/qt-4.7.1/include/QtGui -I/opt/qt-4.7.1/include -I/usr/local/qwt-6.0.1/include -I. -I. -o mainwindow.o mainwindow.cpp
/opt/qt-4.7.1/bin/moc -DQT_NO_DEBUG -DQT_GUI_LIB -DQT_NETWORK_LIB -DQT_CORE_LIB -DQT_SHARED -I/opt/qt-4.7.1/mkspecs/qws/linux-arm-g++ -I. -I/opt/qt-4.7.1/include/QtCore -I/opt/qt-4.7.1/include/QtNetwork -I/opt/qt-4.7.1/include/QtGui -I/opt/qt-4.7.1/include -I/usr/local/qwt-6.0.1/include -I. -I. mainwindow.h -o moc_mainwindow.cpp
arm-linux-g++ -c -pipe -O2 -Wall -W -D_REENTRANT -DQT_NO_DEBUG -DQT_GUI_LIB -DQT_NETWORK_LIB -DQT_CORE_LIB -DQT_SHARED -I/opt/qt-4.7.1/mkspecs/qws/linux-arm-g++ -I. -I/opt/qt-4.7.1/include/QtCore -I/opt/qt-4.7.1/include/QtNetwork -I/opt/qt-4.7.1/include/QtGui -I/opt/qt-4.7.1/include -I/usr/local/qwt-6.0.1/include -I. -I. -o moc_mainwindow.o moc_mainwindow.cpp
arm-linux-g++ -Wl,-O1 -Wl,-rpath,/opt/qt-4.7.1/lib -o QtGUIsample main.o mainwindow.o moc_mainwindow.o -L/opt/qt-4.7.1/lib -L/usr/local/qwt-6.0.1/lib/ -lqwt -lQtGui -L/usr/local/tslib/lib -L/opt/qt-4.7.1/lib -lQtNetwork -lQtCore -lpthread
/usr/local/arm/4.4.1/bin/../lib/gcc/arm-none-linux-gnueabi/4.4.1/../../../../arm-none-linux-gnueabi/bin/ld: skipping incompatible /usr/local/qwt-6.0.1/lib//libqwt.so when searching for -lqwt
/usr/local/arm/4.4.1/bin/../lib/gcc/arm-none-linux-gnueabi/4.4.1/../../../../arm-none-linux-gnueabi/bin/ld: cannot find -lqwt
collect2: ld returned 1 exit status
make: *** [QtGUIsample] Error 1
root@zuoshu-laptop:/home/zuoshu/qtProjects/QtGUIsample#

[Uwe]

Obviously /usr/local/qwt-6.0.1/lib//libqwt.so was not built for ARM.

Uwe

[zuoshulu]

Please teach me how to build qwt for arm. I have already run my helloworld widget on my arm device. Thank you!

[Uwe]

Edit qwtconfig.pri and change the install directory ( to avoid conflicts with your PC build ). Then use qmake from the version you have built for ARM ( or use qmake -spec ..." and Qwt should be built with your cross compiler. You can disable "CONFIG += silent" in qwtbuild.pri to see if the right compiler gets started.

For cross compiling your application you have to configure qmake to use the ARM version of Qwt ( read INSTALL ) and use "CONFIG += qwt" in the project file of your application.

Uwe

[quochung11]

Dear Uwe, i already did as per instruction from you, however i got another problem, it's regarding to QtDesigner:

make[1]: Entering directory `/home/hunglq/qwt-download/qwt-6.0/textengines'
cd mathml/ && make -f Makefile
make[2]: Entering directory `/home/hunglq/qwt-download/qwt-6.0/textengines/mathml'
make[2]: Nothing to be done for `first'.
make[2]: Leaving directory `/home/hunglq/qwt-download/qwt-6.0/textengines/mathml'
make[1]: Leaving directory `/home/hunglq/qwt-download/qwt-6.0/textengines'
cd designer/ && make -f Makefile
make[1]: Entering directory `/home/hunglq/qwt-download/qwt-6.0/designer'
rm -f libqwt_designer_plugin.so
/usr/local/arm/bin/arm-none-linux-gnueabi-g++ -Wl,-rpath,/usr/local/Qt/lib -shared -o libqwt_designer_plugin.so obj/qwt_designer_plugin.o obj/qwt_designer_plotdialog.o obj/moc_qwt_designer_plugin.o obj/moc_qwt_designer_plotdialog.o obj/qrc_qwt_designer_plugin.o -L/usr/local/tslib/lib -L/usr/local/Qt/lib -L/home/hunglq/qwt-download/qwt-6.0/designer/../lib -lqwt -lQtScript -L/usr/local/Qt/lib -L/usr/local/tslib/lib -lQtXml -lQtGui -lQtNetwork -lQtCore -lQtDesigner -lpthread
/usr/local/arm/bin/../lib/gcc/arm-none-linux-gnueabi/4.4.3/../../../../arm-none-linux-gnueabi/bin/ld: cannot find -lQtDesigner
collect2: ld returned 1 exit status
make[1]: *** [plugins/designer/libqwt_designer_plugin.so] Error 1
make[1]: Leaving directory `/home/hunglq/qwt-download/qwt-6.0/designer'
make: *** [sub-designer-make_default-ordered] Error 2

I'm using ubuntu 10.04... qtsdk 4.7.3, qt-everywhere 4.6.2, and qwt 6.0.2...

Do you have any solution to help me solve this problem? Please let me know... thx alots...

[Uwe]

It doesn't make any sense to cross-compile the designer plugin for the target platform, when the designer is not intended to run there ( at least you have disabled the designer itself in your Qt build ). Edit qwtconfig.pri and disable building it.

From the INSTALL file:

qwtconfig.pri and qwtbuild.pri are read by all project files of the Qwt
package. qwtconfig.pri is also read by qwt.prf, when building your
application. So the first step is to edit the *.pri files to adjust
them to your needs.

Uwe