Mex compiling on 64 bit linux - /usr/bin/ld: cannot find -lstdc++

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Wouter
Wouter on 8 Jun 2013
Commented: Joao Henriques on 17 Nov 2014
Okay I am trying to compile a mex file on 64 bit linux, ubuntu to be precise with Matlab 2013a.
First it gave a error that it could not find GLIBCXX_3.4.15. Which was not part of:
/usr/local/MATLAB/R2013a/sys/os/glnxa64/libstdc++.so.6.
ln -s /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.17 libstdc++.so.6
in
/usr/local/MATLAB/R2013a/sys/os/glnxa64
Now I tried to compile again and now I get
/usr/bin/ld: cannot find -lstdc++
collect2: error: ld returned 1 exit status
This is the output
>> mex -v tload3.c
**************************************************************************
Warning: Neither -compatibleArrayDims nor -largeArrayDims is selected.
Using -compatibleArrayDims. In the future, MATLAB will require
the use of -largeArrayDims and remove the -compatibleArrayDims
option. For more information, see:
http://www.mathworks.com/help/matlab/matlab_external/upgrading-mex-files-to-use-64-bit-api.html
**************************************************************************
-> mexopts.sh sourced from directory (DIR = $PREF_DIR)
FILE = /home/wouter/.matlab/R2013a/mexopts.sh
----------------------------------------------------------------
-> MATLAB = /usr/local/MATLAB/R2013a
-> CC = gcc
-> CC flags:
CFLAGS = -ansi -D_GNU_SOURCE -fexceptions -fPIC -fno-omit-frame-pointer -pthread
CDEBUGFLAGS = -g
COPTIMFLAGS = -O -DNDEBUG
CLIBS = -Wl,-rpath-link,/usr/local/MATLAB/R2013a/bin/glnxa64 -L/usr/local/MATLAB/R2013a/bin/glnxa64 -lmx -lmex -lmat -lm -lstdc++
arguments = -DMX_COMPAT_32
-> CXX = g++
-> CXX flags:
CXXFLAGS = -ansi -D_GNU_SOURCE -fPIC -fno-omit-frame-pointer -pthread
CXXDEBUGFLAGS = -g
CXXOPTIMFLAGS = -O -DNDEBUG
CXXLIBS = -Wl,-rpath-link,/usr/local/MATLAB/R2013a/bin/glnxa64 -L/usr/local/MATLAB/R2013a/bin/glnxa64 -lmx -lmex -lmat -lm
arguments = -DMX_COMPAT_32
-> FC = gfortran
-> FC flags:
FFLAGS = -fexceptions -fbackslash -fPIC -fno-omit-frame-pointer
FDEBUGFLAGS = -g
FOPTIMFLAGS = -O
FLIBS = -Wl,-rpath-link,/usr/local/MATLAB/R2013a/bin/glnxa64 -L/usr/local/MATLAB/R2013a/bin/glnxa64 -lmx -lmex -lmat -lm
arguments = -DMX_COMPAT_32
-> LD = gcc
-> Link flags:
LDFLAGS = -pthread -shared -Wl,--version-script,/usr/local/MATLAB/R2013a/extern/lib/glnxa64/mexFunction.map -Wl,--no-undefined
LDDEBUGFLAGS = -g
LDOPTIMFLAGS = -O
LDEXTENSION = .mexa64
arguments =
-> LDCXX =
-> Link flags:
LDCXXFLAGS =
LDCXXDEBUGFLAGS =
LDCXXOPTIMFLAGS =
LDCXXEXTENSION =
arguments =
----------------------------------------------------------------
Warning: You are using gcc version "4.7.3". The version
currently supported with MEX is "4.4.x".
For a list of currently supported compilers see:
http://www.mathworks.com/support/compilers/current_release/
-> gcc -c -I/usr/local/MATLAB/R2013a/extern/include -I/usr/local/MATLAB/R2013a/simulink/include -DMATLAB_MEX_FILE -ansi -D_GNU_SOURCE -fexceptions -fPIC -fno-omit-frame-pointer -pthread -DMX_COMPAT_32 -O -DNDEBUG "tload3.c"
-> gcc -O -pthread -shared -Wl,--version-script,/usr/local/MATLAB/R2013a/extern/lib/glnxa64/mexFunction.map -Wl,--no-undefined -o "tload3.mexa64" tload3.o -Wl,-rpath-link,/usr/local/MATLAB/R2013a/bin/glnxa64 -L/usr/local/MATLAB/R2013a/bin/glnxa64 -lmx -lmex -lmat -lm -lstdc++
/usr/bin/ld: cannot find -lstdc++
collect2: error: ld returned 1 exit status
mex: link of ' "tload3.mexa64"' failed.
Error using mex (line 206) Unable to complete successfully. ps there is a another thread with about the same title, http://stackoverflow.com/questions/16219841/error-building-mex-files-matlab-2012a-on-kubuntu-usr-bin-ld-cannot-find-ls, unfortunatly the answer, installing sudo apt-get install libstdc++6-4.4-dev did not work for me.

Answers (1)

Walter Roberson
Walter Roberson on 8 Jun 2013
You made the link in
/usr/local/MATLAB/R2013a/sys/os/glnxa64
but you do not reference that directory anywhere. Your CXXLIBS and the location you made the link should match.
  2 Comments
Joao Henriques
Joao Henriques on 17 Nov 2014
Thank you! It's quite easy to confuse 'sys/os/glnxa64' with 'bin/glnxa64'. The location reported by 'mex -v' must be exactly where the symlink is located.

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