Symbol not found: ___addtf3

[xiaoxi99cs]

Hi Guys,

Anyone seen this error ? How did u fix it?

ImportError: dlopen(/Users/rock/laugh/laugh-finder/python-training/laughenv/lib/python3.6/site-packages/scipy/linalg/_fblas.cpython-36m-darwin.so, 2): Symbol not found: ___addtf3
Referenced from: /Users/rock/laugh/laugh-finder/python-training/laughenv/lib/python3.6/site-packages/scipy/linalg/../.dylibs/libquadmath.0.dylib
Expected in: /usr/local/lib/libgcc_s.1.dylib
in /Users/rock/laugh/laugh-finder/python-training/laughenv/lib/python3.6/site-packages/scipy/linalg/../.dylibs/libquadmath.0.dylib
(laughenv) rockmac:python-training rock$ python3 main.py
Traceback (most recent call last):
File "main.py", line 6, in
from file_feature_extraction import file_feature_extraction
File "/Users/rock/laugh/laugh-finder/python-training/file_feature_extraction.py", line 1, in
import scipy.io.wavfile as wavfile
File "/Users/rock/laugh/laugh-finder/python-training/laughenv/lib/python3.6/site-packages/scipy/io/init.py", line 97, in
from .matlab import loadmat, savemat, whosmat, byteordercodes
File "/Users/rock/laugh/laugh-finder/python-training/laughenv/lib/python3.6/site-packages/scipy/io/matlab/init.py", line 13, in
from .mio import loadmat, savemat, whosmat
File "/Users/rock/laugh/laugh-finder/python-training/laughenv/lib/python3.6/site-packages/scipy/io/matlab/mio.py", line 12, in
from .miobase import get_matfile_version, docfiller
File "/Users/rock/laugh/laugh-finder/python-training/laughenv/lib/python3.6/site-packages/scipy/io/matlab/miobase.py", line 22, in
from scipy.misc import doccer
File "/Users/rock/laugh/laugh-finder/python-training/laughenv/lib/python3.6/site-packages/scipy/misc/init.py", line 53, in
from scipy.interpolate._pade import pade
File "/Users/rock/laugh/laugh-finder/python-training/laughenv/lib/python3.6/site-packages/scipy/interpolate/init.py", line 176, in
from .interpolate import *
File "/Users/rock/laugh/laugh-finder/python-training/laughenv/lib/python3.6/site-packages/scipy/interpolate/interpolate.py", line 20, in
import scipy.linalg
File "/Users/rock/laugh/laugh-finder/python-training/laughenv/lib/python3.6/site-packages/scipy/linalg/init.py", line 175, in
from .misc import *
File "/Users/rock/laugh/laugh-finder/python-training/laughenv/lib/python3.6/site-packages/scipy/linalg/misc.py", line 5, in
from .blas import get_blas_funcs
File "/Users/rock/laugh/laugh-finder/python-training/laughenv/lib/python3.6/site-packages/scipy/linalg/blas.py", line 155, in
from scipy.linalg import _fblas
ImportError: dlopen(/Users/rock/laugh/laugh-finder/python-training/laughenv/lib/python3.6/site-packages/scipy/linalg/_fblas.cpython-36m-darwin.so, 2): Symbol not found: ___addtf3
Referenced from: /Users/rock/laugh/laugh-finder/python-training/laughenv/lib/python3.6/site-packages/scipy/linalg/../.dylibs/libquadmath.0.dylib
Expected in: /usr/local/lib/libgcc_s.1.dylib
in /Users/rock/laugh/laugh-finder/python-training/laughenv/lib/python3.6/site-packages/scipy/linalg/../.dylibs/libquadmath.0.dylib

Thanks
Rock

[MilesDowe]

Hi Rock,

Thanks for bringing up this issue!

I'm not entirely certain, but I suspect this is an issue with the setup of scipy. Googling your specific issue
(__addtf3) brought up a handful of issues that seem to have been resolved through updating/reinstalling scipy packages.

• https://stackoverflow.com/questions/31667876/failed-scipy-special-import-symbol-not-found-addtf3
• ImportError: ... _fblas.so, 2): Symbol not found: ___addtf3 yosinski/deep-visualization-toolbox#104
• Failed import of scipy.special: “Symbol not found: ___addtf3” scipy/scipy#5093

Let me know if those leads aren't helpful or if you continue to have issues. If you are able to resolve it, please supply me any details and I'll gladly update the README.

[ens-lg4]

It took me almost a week to find the real cause behind this ImportError.

So I'd like to share my humble analysis for others who might hit the same thing again.

The ___addtf3 symbol is a GCC software floating point function. It is used by scipy indirectly, and sometimes the order of search paths on your system does not let the right library to be found.

With the help of "nm" utility I have searched my system for dynamic libraries that contain the definition of this function and it happened to be in /usr/local/opt/gcc/lib/gcc/7/libgcc_ext.10.4.dylib (I installed my gcc-7 using brew) . Your mileage may vary, but most likely you need to find where your GCC libraries live.

My DYLD_LIBRARY_PATH initially contained "/usr/lib", and I tried both prepending and appending the newly found path /usr/local/opt/gcc/lib/gcc/7 to the old path.

Appending did not have any effect at all. However, prepending solved the ImportError, which means there must be some kind of red herring in /usr/lib that was preventing the correct operation.

[jhsenjaliya]

I had system gcc at /usr/bin/gcc and removing /usr/bin from DYLD_LIBRARY_PATH worked for me ( on Catalina mac OS). Thanks Leo Gordon ( @ens-lg4 ) for sharing.

[izakharkin]

UPD: Solved, the details are here.

@ens-lg4 appreciate your help very much, but the approach you proposed does not work for me, unfortunately :(

I am trying to load some custom mylib.dylib with python3.7 on Mac OS X Big Sur 11.1 and it gives me this error:

OSError                                   Traceback (most recent call last)
<ipython-input-7-21ad9f6d803b> in <module>
     12 try:
---> 13     mylib = ctypes.CDLL(mylib_path)
     14 except OSError:

~/opt/anaconda3/lib/python3.7/ctypes/__init__.py in __init__(self, name, mode, handle, use_errno, use_last_error)
    363         if handle is None:
--> 364             self._handle = _dlopen(self._name, mode)
    365         else:

OSError: dlopen(mylib.dylib, 6): Symbol not found: ___addtf3
  Referenced from: /usr/local/opt/gcc/lib/gcc/10/libquadmath.0.dylib
  Expected in: flat namespace
 in /usr/local/opt/gcc/lib/gcc/10/libquadmath.0.dylib

nm of /usr/local/opt/gcc/lib/gcc/10/libgcc_ext.10.4.dylib shows that it containts __addtf3 exactly, but setting DYLD_LIBRARY_PATH does not affect at all. I tried:

• export DYLD_LIBRARY_PATH=$DYLD_LIBRARY_PATH:/usr/local/opt/gcc/lib/gcc/10/
• export DYLD_LIBRARY_PATH=/usr/local/opt/gcc/lib/gcc/10/:$DYLD_LIBRARY_PATH
• In python script: os.environ['DYLD_LIBRARY_PATH'] = "/usr/local/opt/gcc/lib/gcc/10/"
• In ~/opt/anaconda3/lib/python3.7/ctypes/macholib/dyld.py: have tried to change the values of DEFAULT_FRAMEWORK_FALLBACK and DEFAULT_LIBRARY_FALLBACK variables accordingly

I also tried to set the path to libgcc_ext.10.4.dylib in libquadmath.0.dylib:

install_name_tool -change /usr/lib/libSystem.B.dylib /usr/local/opt/gcc/lib/gcc/10/libgcc_ext.10.4.dylib /usr/local/opt/gcc/lib/gcc/10/libquadmath.0.dylib

It might help because there is no /usr/lib/libSystem.B.dylib on Big Sur 11.1 (so this file is not used I suppose), but instead it gives me a new error:

---------------------------------------------------------------------------
OSError                                   Traceback (most recent call last)
<ipython-input-7-21ad9f6d803b> in <module>
     12 try:
---> 13     mylib = ctypes.CDLL(mylib_path)
     14 except OSError:

~/opt/anaconda3/lib/python3.7/ctypes/__init__.py in __init__(self, name, mode, handle, use_errno, use_last_error)
    363         if handle is None:
--> 364             self._handle = _dlopen(self._name, mode)
    365         else:

OSError: dlopen(mylib.dylib, 6): Library not loaded: /usr/local/opt/gcc/lib/gcc/10/libgcc_ext.10.4.dylib
  Referenced from: /usr/local/opt/gcc/lib/gcc/10/libquadmath.0.dylib
  Reason: no suitable image found.  Did find:
	/usr/local/opt/gcc/lib/gcc/10/libgcc_ext.10.4.dylib: mach-o, but wrong filetype
	/usr/local/Cellar/gcc/10.2.0/lib/gcc/10/libgcc_ext.10.4.dylib: mach-o, but wrong filetype

I am quite new to all this dynamic linking stuff, so any advice and thoughts would be highly appreciated 🙏