[osg-users] First recipe from cookbook won't compile with given source code

[Rodrigo Dias]

Hi,

I'm following the OpenSceneGraph 3 Cookbook (http://ahux.narod.ru/olderfiles/1/OSG3_Cookbook.pdf) to learn more about OSG. So I created a directory Cookbook following the directory structure from the source code here (https://github.com/xarray/osgRecipes/tree/master/cookbook).

Before compiling the first recipe, I had copied the "Common Functions" from the textbook (pages 38-39), into a file called "CommonFunctions". When compiling (with g++ on Linux) I got the following error:


> $ g++ observer_ptr.cpp -I../.. -losg -losgDB -losgGA -losgText -losgUtil -losgViewer -o observer_ptr
> 
> In file included from observer_ptr.cpp:11:0:
> ../../CommonFunctions: In member function ‘virtual bool osgCookBook::PickHandler::handle(const osgGA::GUIEventAdapter&, osgGA::GUIActionAdapter&)’:
> ../../CommonFunctions:47:62: error: binding ‘const osgUtil::LineSegmentIntersector::Intersection’ to reference of type ‘osgUtil::LineSegmentIntersector::Intersection&’ discards qualifiers
>       osgUtil::LineSegmentIntersector::Intersection& result = *(intersector->getIntersections().begin());
> 


../.. is the path to the CommonFunctions file. I tried a few const_cast operations, but I don't have so much experience with C++ and couldn't solve it. I commented out this two lines and the program compiled fine and ran, though clicking on the objects wouldn't dismiss them (guess that's what these lines do).

Then I noticed they have this "CommonFunctions" file together with the given source code, so I replaced mine with theirs (CommonFunctions and CommonFunctions.cpp). But when compiling, a new error:


> $ g++ observer_ptr.cpp -I../.. -losg -losgDB -losgGA -losgText -losgUtil -losgViewer -o observer_ptr
> 
> /tmp/cca0xsAB.o: In function `main':
> observer_ptr.cpp:(.text+0x79): undefined reference to `osgCookBook::createText(osg::Vec3f const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, float)'
> observer_ptr.cpp:(.text+0x103): undefined reference to `osgCookBook::createHUDCamera(double, double, double, double)'
> /tmp/cca0xsAB.o:(.data.rel.ro._ZTV18RemoveShapeHandler[_ZTV18RemoveShapeHandler]+0xb8): undefined reference to `osgCookBook::PickHandler::handle(osgGA::GUIEventAdapter const&, osgGA::GUIActionAdapter&)'
> /tmp/cca0xsAB.o:(.data.rel.ro._ZTC18RemoveShapeHandler0_N11osgCookBook11PickHandlerE[_ZTV18RemoveShapeHandler]+0x18): undefined reference to `typeinfo for osgCookBook::PickHandler'
> /tmp/cca0xsAB.o:(.data.rel.ro._ZTC18RemoveShapeHandler0_N11osgCookBook11PickHandlerE[_ZTV18RemoveShapeHandler]+0xb8): undefined reference to `osgCookBook::PickHandler::handle(osgGA::GUIEventAdapter const&, osgGA::GUIActionAdapter&)'
> /tmp/cca0xsAB.o:(.data.rel.ro._ZTC18RemoveShapeHandler0_N11osgCookBook11PickHandlerE[_ZTV18RemoveShapeHandler]+0xe0): undefined reference to `typeinfo for osgCookBook::PickHandler'
> /tmp/cca0xsAB.o:(.data.rel.ro._ZTC18RemoveShapeHandler0_N11osgCookBook11PickHandlerE[_ZTV18RemoveShapeHandler]+0x218): undefined reference to `typeinfo for osgCookBook::PickHandler'
> /tmp/cca0xsAB.o:(.data.rel.ro._ZTC18RemoveShapeHandler0_N11osgCookBook11PickHandlerE[_ZTV18RemoveShapeHandler]+0x428): undefined reference to `typeinfo for osgCookBook::PickHandler'
> /tmp/cca0xsAB.o:(.data.rel.ro._ZTI18RemoveShapeHandler[_ZTI18RemoveShapeHandler]+0x10): undefined reference to `typeinfo for osgCookBook::PickHandler'
> collect2: error: ld returned 1 exit status
> 


Can anybody please tell me what am I doing wrong?

Thank you!

Cheers,
Rodrigo

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