signal SIGSEGV, Segmentation fault

[Andreas Höschler]

Hi all,

I am testing one of my apps out on the recent GNUstep tree I managed to get to work on Ubuntu 16.04 in the meanwhile. I already got relatively far with a few minor tweaks (replacing deprecated methods,...). However, I got stuck at one point and have no idea how to proceed from here! :-(

I have a subclass

MapView : ESMMapView : GSImageView : NSImageView

with 

@interface MapView : ESMMapView //FBMapView

{

   NSPoint _currentPosition;

   NSTimer *_routeFadeTimer;

   float _positionAlpha;

   BOOL _addAlpha;

   NSString *_message;

   NSArray *_routeNodes;

   NSBezierPath *_routePath;

   NSArray *_departurePaths;

   NSArray *_arrivalPaths;

   NSArray *_overlayPaths;

      

   BOOL _routeVisible;

   BOOL _departurePathVisible;

   BOOL _arrivalPathVisible;

}

and

@interface ESMMapView : GSImageView  

{   

   BOOL _osmDrawing;

   BOOL _drawPrimaryInLays;

   BOOL _drawOtherInLays;

   NSRect _visibleMapSection;

   float _heightOfVisibleMapInKm;

   NSMutableArray *_labels;

   NSArray *_bezierPathsForLand;   

   NSData *_shapeData;

   

   @public   

   NSMutableArray *_rectObjects;   // make sure labels do not overlap

   NSMutableArray *_mapPaths;     // for each kind one, unless we are in detailed mode

   NSMutableArray *_mapShields;  // "A1", B 203",...

   NSMutableArray *_mapLabels;   // lables like "Bad Oldesloe", "AS Reinfeld", "Bahnhof",...

   NSMutableArray *_mapLocs;      // Polter, Companies,...

   NSMutableArray *_mapLines;     // routes

}

I get a 

Thread 1 "TimberNav" received signal SIGSEGV, Segmentation fault.

-[MapView drawRect:] (self=0xb7ca746e <-[NSView displayRectIgnoringOpacity:inContext:]+318>,

    _cmd=0x8a704b8, rect=...) at MapView.m:168

168           NSLog(@"routeVisible: %d", _routeVisible);

(gdb)

when running the app in gdb and simply a

Segmentation fault

when running the app directly. This happens in the MapView::drawRect method

- (void)drawRect:(NSRect)rect

{

   NSLog(@"MapView drawRect %@ ... _osmDrawing %d", NSStringFromRect(rect), _osmDrawing);

   [super drawRect:rect];

   NSLog(@"After super drawRect:rect");

   [self bums];

   //   if (image != nil && _osmDrawing == NO)

     {

      NSImage *image = [self image];

      NSSize imageSize = [image size];

      

      // draw route

      NSLog(@"routeVisible: %d", _routeVisible);  // <-- this causes the SIGSEGV

      NSLog(@"routePath: %@", _routePath);

      

      if (_routeVisible && _routePath != nil)

        {

         [[NSColor purpleColor] set];

         

         [_routePath setLineWidth:8];

         [_routePath stroke];

        }

    ...

}

while accessing one of its instance variables, actually in the 

      NSLog(@"routeVisible: %d", _routeVisible);

line. When I comment this line out I get the same error in the next line while accessing _routePath and so on. I am clueless how to fix this. The code works on MacOSX and also with on an ancient GNUstep/Debian/Kubuntu setup. Any idea what might cause this trouble on Ubuntu 16.04 with the latest GNUstep or how to further track this down?

Thanks a lot in advance!!

Andreas