BNC for Raspberry Pi

[wiese]

BNC compilation crashes on Rasperry Pi. (Model B Rev. 2)

qwt_polar_curve.cpp: In member function ‘void 
QwtPolarCurve::drawLines(QPainter*, const QwtScaleMap&, const 
QwtScaleMap&, const QPointF&, int, int) const’:
qwt_polar_curve.cpp:436:64: error: no matching function for call to 
‘qMax(double, qreal)’
qwt_polar_curve.cpp:436:64: note: candidate is:
/usr/include/qt4/QtCore/qglobal.h:1198:34: note: template<class T> const 
T& qMax(const T&, const T&)
Makefile:326: recipe for target '.obj/qwt_polar_curve.o' failed
make[1]: *** [.obj/qwt_polar_curve.o] Error 1
make[1]: Leaving directory '/home/wiese/BNC_2.12.2/qwtpolar'
Makefile:114: recipe for target 'sub-qwtpolar-make_default-ordered' failed
make: *** [sub-qwtpolar-make_default-ordered] Error 2

There are 2 errors more like that. Errors are all within ​QwtPolar.

[wiese]

The errors related to expected QReal variables where the compiler only finds doubles. Need to make the following changes (Thanks to Eric Younkin from NOAA!):

In BNC_2.12.2/qwtpolar/qwt_polar_curve.cpp, Line 436 Change

double off = qCeil( qMax(1.0, painter->pen().widthF() ) );
To
double off = qCeil( qMax(qreal(1.0), painter->pen().widthF() ) );

In BNC_2.12.2/qwtpolar/qwt_polar_layout.cpp, Line 281 Change

dim = qMin( hint.width(), rect.width() * d_data->legendRatio );
To
dim = qMin( hint.width(), qreal(rect.width() * d_data->legendRatio) );

In BNC_2.12.2/qwtpolar/qwt_polar_layout.cpp, Line 296 Change

dim = qMin( hint.width(), rect.width() * d_data->legendRatio );
To
dim = qMin( hint.width(), qreal(rect.width() * d_data->legendRatio) );

Thex next problem was that there wasn't enough memory for comiling. Installing zram (see ​raspberry-pi-performance-tuning and increasing swap from 100 to 500MB helped to successfully compile BNC. It takes about 2 hours on my raspi B Rev. 2.0.

Libs that I installed with apt-get: build-essential, libssl-dev, qt4-qmake, xterm

Executables are available at ​https://igs.bkg.bund.de/ntrip/download.

[stuerze]

The mentioned changes are now part of BNC's SVNs and will be part of each future BNC version.