On 30 April 2012 13:39, F. Heitkamp wrote: > People will tell me to ask on matplotlib list but I believe this a more > generic GNU C++ question. > I have been trying to run matplotlib that I built from source on my linux > from scratch like box. > > When I try to run an example I get: > > bash-4.2$ python2.6 matplotlib-ex1.py > Traceback (most recent call last): > File "matplotlib-ex1.py", line 13, in <module> > import matplotlib.pyplot as plt > File "/usr/lib/python2.6/site-packages/matplotlib/pyplot.py", line 23, in > <module> > from matplotlib.figure import Figure, figaspect > File "/usr/lib/python2.6/site-packages/matplotlib/figure.py", line 16, in > <module> > import artist > File "/usr/lib/python2.6/site-packages/matplotlib/artist.py", line 6, in > <module> > from transforms import Bbox, IdentityTransform, TransformedBbox, > TransformedPath > File "/usr/lib/python2.6/site-packages/matplotlib/transforms.py", line 34, > in <module> > from matplotlib._path import affine_transform > ImportError: /usr/lib/python2.6/site-packages/matplotlib/_path.so: undefined > symbol: > _ZSt16__ostream_insertIcSt11char_traitsIcEERSt13basic_ostreamIT_T0_ES6_PKS3_i > > I see this symbol is in 32 bits libstdc++ library, but does not seem to > appear in 64 bits versions. Right, the equivalent symbol in the 64-bit lib ends in _l instead of _i > bash-4.2$ ldd /usr/lib/python2.6/site-packages/matplotlib/_path.so > linux-gate.so.1 => (0xffffe000) > libpython2.6.so.1.0 => /usr/lib/libpython2.6.so.1.0 (0xf74f7000) > libgcc_s.so.1 => /lib/libgcc_s.so.1 (0xf74de000) > libpthread.so.0 => /lib/libpthread.so.0 (0xf74c4000) > libc.so.6 => /lib/libc.so.6 (0xf7367000) > libdl.so.2 => /lib/libdl.so.2 (0xf7362000) > libutil.so.1 => /lib/libutil.so.1 (0xf735e000) > libm.so.6 => /lib/libm.so.6 (0xf7338000) > /lib/ld-linux.so.2 (0xf77d1000) > > libstdc++ is not shown as being linked with _path.so > > Any thoughts? Is _path.so a 32-bit or 64-bit library? From the missing symbol I'm asuming 32-bit. It would appear it wasn't correctly linked, so its dependency on libstdc++.so isn't recorded in the library by a DT_NEEDED entry. Does it help if you tell the dynamic linker to preload libstdc++.so? LD_PRELOAD=/usr/lib/libstdc++.so python2.6 matplotlib-ex1.py
