Re: [Discuss-gnuradio] Python errors running flowgraph - first attempt

[Tom Rondeau]

Sorry that I have no insight into this right now, but I wanted to follow up and see if there was any progress made on this problem?

Tom

On Mon, Feb 9, 2015 at 11:28 AM, Larry Van Der Jagt <address@hidden> wrote:

Thanks:

The info Chris sent along has helped to move this along although at this point I still don't have a solution or a root cause.

The library that issues the error message is /usr/lib/python2.7/site-packages/PyQt4/QtDeclarative.so and the symbol it complains about is _ZTI16QDeclarativeView

When you Readelf this file you find:

Dynamic section at offset 0x40728 contains 29 entries:

  Tag        Type                         Name/Value

 0x00000001 (NEEDED)                     Shared library: [libQtGui.so.4]

 0x00000001 (NEEDED)                     Shared library: [libQtCore.so.4]

 0x00000001 (NEEDED)                     Shared library: [libstdc++.so.6]

 0x00000001 (NEEDED)                     Shared library: [libgcc_s.so.1]

 0x00000001 (NEEDED)                     Shared library: [libc.so.6]

 0x0000000e (SONAME)                     Library soname: [libQtDeclarative.so.1]

and

00040128  0000b202 R_ARM_ABS32       00000000   _ZTI16QDeclarativeView

and

   178: 00000000     0 NOTYPE  GLOBAL DEFAULT  UND _ZTI16QDeclarativeView

There is also a library in /usr/lib that is libQtDeclarative.so.4.8.6 that has symbolic links to it named libQtDeclarative.so, .so.4 and .so.4.8.  I though that if I added one for libQtDeclarative.so.1 this might fix the issue, but it did not.

When you readelf libQtDeclarative.so.4.8.6 you find:

Dynamic section at offset 0x2ce040 contains 34 entries:
  Tag        Type                         Name/Value
0x00000001 (NEEDED)                     Shared library: [libQtScript.so.4]
0x00000001 (NEEDED)                     Shared library: [libQtSql.so.4]
0x00000001 (NEEDED)                     Shared library: [libQtXmlPatterns.so.4]
0x00000001 (NEEDED)                     Shared library: [libQtGui.so.4]
0x00000001 (NEEDED)                     Shared library: [libQtNetwork.so.4]
0x00000001 (NEEDED)                     Shared library: [libQtCore.so.4]
0x00000001 (NEEDED)                     Shared library: [libstdc++.so.6]
0x00000001 (NEEDED)                     Shared library: [libm.so.6]
0x00000001 (NEEDED)                     Shared library: [libgcc_s.so.1]
0x00000001 (NEEDED)                     Shared library: [libc.so.6]
0x0000000e (SONAME)                     Library soname: [libQtDeclarative.so.4]

and

002d0c94  0009ef02 R_ARM_ABS32       002d0c80   _ZTI16QDeclarativeView
002d0d8c  0009ef02 R_ARM_ABS32       002d0c80   _ZTI16QDeclarativeView

and

2543: 002d0c80    12 OBJECT  GLOBAL DEFAULT   20 _ZTI16QDeclarativeView

I also tried copying /usr/lib/libQtDeclarative.so.4.8.6 to the /usr/lib/python2.7/site-packages/pyQt4 directory as libQtDeclarative.so.1 to no avail.

I tried calling gnuradio-companion with LD_PRELOAD=/usr/lib/libQtDeclarative.so.4.8.6 gnuradio-companion and this let the process proceed a little further this time the undefined symbol is in line 11 of QT.py in QTSvg.so and is _ZTI10QSvgWidget.

I will keep drilling down on this, but thought I might post first just in case someone recognizes the real issue and perhaps it can be fixed with a simple adjustment to the environment.

With respect to the concept that GRC is not really something to run on the embedded processor, that's surely valid, but unless I do not understand how these pieces work, if the QT GUI can run you can't get graphical elements to work even in the produced Python code and that seriously reduces the utility of the embedded device.

All comments and direction are appreciated.

LVDJ

--

Larry Van Der Jagt

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