Cross-compile for RPi

[Jan Iversen]

Just a thought (from a rasberry developer), this platform is pretty weak, so it would make sense to port the mobile version, that should solve some of your problems, while keeping the download functionality.

rgds
jan i

Enviado desde mi iPad

> El 9 ago 2018, a las 18:27, Robert Helling <helling at atdotde.de> escribió:
> 
> Hi,
> 
>> On 6. Aug 2018, at 15:43, Philip Balister <philip at balister.org> wrote:
>> 
>> Maybe, but on work travel. I'm not familiar with raspbian, anyone know
>> if they have cross compilers available.
>> 
>> If I get time, I can look at creating a pi-s image with subsurface. Just
>> need to figure out how to build subsurface without using the script :)
> 
> I just picked up another raspberry pi to take with me on my summer vacation. It had a Rapberrian based on Debian Squeeze on it. It turns out that lacks qt location. I tried to comment out all location stuff and build without map but so far without success. The other problem is that the imagedownloader throws compile errors starting with
> 
> /home/pi/src/subsurface/core/imagedownloader.cpp: In function 'std::pair<QImage, bool> getHashedImage(const QString&, bool)':
> /home/pi/src/subsurface/core/imagedownloader.cpp:118:9: error: 'qInfo' was not declared in this scope
>   qInfo() << "Error loading image" << filename << "[local:" << localFilename << "]";
>         ^
> /home/pi/src/subsurface/core/imagedownloader.cpp: In member function 'void Thumbnailer::imageDownloaded(QString)':
> /home/pi/src/subsurface/core/imagedownloader.cpp:247:101: error: no matching function for call to 'run(QThreadPool*, Thumbnailer::imageDownloaded(QString)::<lambda()>)'
>  workingOn[filename] =QtConcurrent::run(&pool, [this, filename]() { processItem(filename, false); });
>                                                                                                     ^
> /home/pi/src/subsurface/core/imagedownloader.cpp:247:101: note: candidates are:
> In file included from /usr/include/arm-linux-gnueabihf/qt5/QtConcurrent/QtConcurrent:14:0,
>                 from /home/pi/src/subsurface/core/imagedownloader.cpp:16:
> /usr/include/arm-linux-gnueabihf/qt5/QtConcurrent/qtconcurrentrun.h:70:12: note: template<class T> QFuture<T> QtConcurrent::run(T (*)())
> QFuture<T> run(T (*functionPointer)())
>            ^
> /usr/include/arm-linux-gnueabihf/qt5/QtConcurrent/qtconcurrentrun.h:70:12: note:   template argument deduction/substitution failed:
> /home/pi/src/subsurface/core/imagedownloader.cpp:247:101: note:   mismatched types 'T()' and 'QThreadPool'
>  workingOn[filename] = QtConcurrent::run(&pool, [this, filename]() { processItem(filename, false); });
>                                                                                                     ^
> In file included from /usr/include/arm-linux-gnueabihf/qt5/QtConcurrent/QtConcurrent:14:0,
>                 from /home/pi/src/subsurface/core/imagedownloader.cpp:16:
> /usr/include/arm-linux-gnueabihf/qt5/QtConcurrent/qtconcurrentrun.h:75:12: note: template<class T, class Param1, class Arg1> QFuture<T> QtConcurrent::run(T (*)(Param1), const Arg1&)
> QFuture<T> run(T (*functionPointer)(Param1), const Arg1 &arg1)
>            ^
> /usr/include/arm-linux-gnueabihf/qt5/QtConcurrent/qtconcurrentrun.h:75:12: note:   template argument deduction/substitution failed:
> /home/pi/src/subsurface/core/imagedownloader.cpp:247:101: note:   mismatched types 'T(Param1)' and 'QThreadPool'
>  workingOn[filename] = QtConcurrent::run(&pool, [this, filename]() { processItem(filename, false); });
>                                                                                                     ^
> 
> and continuing for many screens. I have not really looked into this at any depth but the fact that it seems to be about C++ templates does not make me optimistic. Maybe bstoeger can help.
> 
> Right now, I have to run. The next thing to try will be to start with a more recent Debian stretch.
> 
> Best
> Robert
> 
> 
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> Robert C. Helling     Elite Master Course Theoretical and Mathematical Physics
>                      Scientific Coordinator
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