dlopen failing on library with statically linked dependencies Post: 302433040

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Top Forums Programming dlopen failing on library with statically linked dependencies Post 302433040 by Hodapp87 on Monday 28th of June 2010 09:33:27 AM

06-28-2010

Registered User

dlopen failing on library with statically linked dependencies

I am attempting to port a program from OS X to Linux. It's C++ & Qt Creator and I did the original Windows to OS X port, so I tried to make it as POSIX-compliant as possible; the OS X port works well, and the Linux port builds and starts (it's on Ubuntu 9.10) but has some issues running.
The application has a plugin system. Plugins are built along with the main executable, and then are loaded at startup via dlopen. One of these plugins links to VTK and the only thing setting this apart from the various other 3rd-party dependencies is that VTK here is statically linked. When I attempt to dlopen this plugin, or any plugin which depends on that plugin, dlopen throws an error like this:

Quote:

./Plugins/libVirtualCameraImaged.so.1: undefined symbol: _ZN29vtkInformationStringVectorKeyC1EPKcS1_i

The part that perplexes me is that the plugin code itself can compile and link without this error; if I had forgotten a library at compile time, it would never have linked. It's not dynamically linked with VTK, so LD_LIBRARY_PATH is irrelevant and I can't use 'ldd' to see where it's trying to find it. Looking at the build output, I see the "-L/usr/local/lib/vtk-5.6" and "-lvtkCommon" telling me that it has the right path to the right library, and I can look in the output of 'nm libvtkCommon.a' and see the aforementioned symbol:

Quote:

000000d6 T _ZN29vtkInformationStringVectorKeyC1EPKcS1_i

...so I know it is linking with a library that defines that undefined symbol.

Does anyone have any idea what I could be doing wrong in this build to get symptoms like this?

Hodapp87

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xvgrabport

XvGrabPort(3)                                                     libXv Functions                                                    XvGrabPort(3)

NAME

       XvGrabPort - lock port for exclusive use by client

SYNOPSIS

       #include <X11/extensions/Xvlib.h>

       int XvGrabPort(Display *dpy, XvPortID port, Time time);

ARGUMENTS

       dpy     Specifies the connection to the X server.

       port    Defines the port to be grabbed.

       time    Specifies the request timestamp.

DESCRIPTION

       XvGrabPort(3) grabs a port.  Once a client grabs a port, only that client can make video requests to that port.

       If  the  time  is  before  the  current port time, the XvGrabPort request is ignored and XvInvalidTime is returned.  If the port is already
       grabbed by another client, XvAlreadyGrabbed is returned. Otherwise it returns a status of Success.  The port time is updated when the  fol-
       lowing requests are processed: XvGrabPort(3), XvUngrabPort(3), XvPutVideo(3), XvPutStill(3), XvGetVideo(3), XvGetStill(3).

       If  the port is actively processing video for another client, the video is preempted, and an XvVideoNotify event with detail XvPreempted is
       generated for its drawable.

RETURN VALUES

       [Success]
               Returned if XvGrabPort(3) completed successfully.

       [XvInvalidTime]
               Returned if requested time is older than the current port time.

       [XvAlreadyGrabbed]
               Returned if the port is already grabbed by another client.

       [XvBadExtension]
               Returned if the Xv extension is unavailable.

       [XvBadAlloc]
               Returned if XvGrabPort(3) failed to allocate memory to process the request.

DIAGNOSTICS

       [XvBadPort]    Generated if the requested port does not exist.

SEE ALSO

       XvUngrabPort(3), XvVideoNotify(3)

X Version 11                                                        libXv 1.0.7                                                      XvGrabPort(3)