I am having a problem getting an OpenSceneGraph project to link properly on my Mac. I installed it via macports and I have gotten osgviewer and other osg programs to work, meaning it was compiled and linked somehow. The code is part of a larger project, however I separated out the OSG code down to the bare bones to isolate my problems. I first thought it was a CMake issue, so I created a Makefile to try and isolate there. That made no difference.
Here is the the sample code.
// OpenSceneGraph Libraries
#include <osg/Geode>
#include <osg/Group>
#include <osg/ShapeDrawable>
#include <osgUtil/Optimizer>
#include <osgUtil/SmoothingVisitor>
#include <osgUtil/Simplifier>
#include <osg/Node>
#include <osg/Texture1D>
#include <osg/Texture2D>
#include <osg/TexGen>
#include <osg/Material>
#include <osgViewer/Viewer>
#include <osgDB/Registry>
#include <osgDB/WriteFile>
#include <osgDB/ReadFile>
#include <osgSim/Version>
#include <osgFX/Version>
#include <osgTerrain/Version>
#include <osgVolume/Version>
// C++ Libraries
#include <iostream>
#include <string>
/**
* @brief Main Application
*/
int main( int argc, char* argv[] )
{
// Define Write Options
osgDB::Options* write_options = new osgDB::Options("WriteImageHint=IncludeData Compressor=zlib");
// Create the Root Nodes
osg::ref_ptr<osg::Group> root_node(new osg::Group());
// Write the Node File
osgDB::writeNodeFile( *root_node.get(),
"output.osgb",
write_options );
// Return
return 0;
}
Here is the Makefile code. I have added way more than needed to no effect.
OSG_LIBS=-lOpenThreads -losgDB -losg -losgUtil -losgTerrain
LIBS=-L/opt/local/lib $(OSG_LIBS)
INCL=-I/opt/local/include
CPP=clang++
foo: foo.cpp
$(CPP) foo.cpp $(LIBS) $(INCL)
Here is the make output with VERBOSE=1 on the specific command.
$ make VERBOSE=1
clang++ foo.cpp -L/opt/local/lib -lOpenThreads -losgDB -losg -losgUtil -losgTerrain -I/opt/local/include
Undefined symbols for architecture x86_64:
"osgDB::writeNodeFile(osg::Node const&, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, osgDB::Options const*)", referenced from:
_main in foo-2c45f6.o
"osgDB::Options::parsePluginStringData(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, char, char)", referenced from:
osgDB::Options::Options(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&) in foo-2c45f6.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [foo] Error 1
I have run otool and other apps against the shared libraries to try and find where the undefined reference is. I know when I run nm, the symbol for both of these methods are in libosgDB.dylib, yet linking it does not work.
I am starting to compile OpenSceneGraph from source, but that is also creating compile errors on its own. I have a long fight ahead of me. Thank you very much in advance for your time.
Update:
Observations
- Reordering the libraries on the compiler line does not work.
