Hi
On an gentoo system with qwt-6.0.2 the qtgui builds nut fails to run.
The test reports
libgnuradio-qtgui-3.7.2git.so.0.0.0: undefined symbol:
_ZNK7QwtPlot9drawItemsEP8QPainterRK6QRectFPK11QwtScaleMapq
This is due to mixture of qwt5 ( used for PyQt )and qwt libs.
FindQwt.cmake sets:
//Path to a file.
QWT_INCLUDE_DIRS:PATH=/usr/include/qwt6
//Path to a library.
QWT_LIBRARIES:FILEPATH=/usr/lib64/libqwt.so
But on gentoo
/usr/lib64/libqwt6.so -> libqwt6.so.6.0.2
/usr/lib64/libqwt6.so.6 -> libqwt6.so.6.0.2
/usr/lib64/libqwt6.so.6.0 -> libqwt6.so.6.0.2
/usr/lib64/libqwt6.so.6.0.2
/usr/lib64/libqwt.so -> libqwt.so.5.2.3
/usr/lib64/libqwt.so.5 -> libqwt.so.5.2.3
/usr/lib64/libqwt.so.5.2 -> libqwt.so.5.2.3
/usr/lib64/libqwt.so.5.2.3
So the header files are taken from qwt6 but the used library is qwt5 .
I suggest to change
find_library (QWT_LIBRARIES
NAMES qwt qwt6 qwt-qt4
in FindQwt.cmake
to
find_library (QWT_LIBRARIES
NAMES qwt6 qwt qwt-qt4
Then qtgui is build correctly and runs without problems.
But I don't know if there are side effects on other distros.
--Volker
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