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

Question

Wouter 2013-6-8

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/78436-mex-compiling-on-64-bit-linux-usr-bin-ld-cannot-find-lstdc

评论： Joao Henriques 2014-11-17

在 MATLAB Online 中打开

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.

I found this thread http://stackoverflow.com/questions/5216399/usr-lib-libstdc-so-6-version-glibcxx-3-4-15-not-found and succesfully created a symbolic link

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.

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Answer 1

Walter Roberson 2013-6-8

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/78436-mex-compiling-on-64-bit-linux-usr-bin-ld-cannot-find-lstdc#answer_88158

在 MATLAB Online 中打开

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.

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Wouter 2013-6-8

Hmmm I do not understand what you mean by this. Can you clearify a bit further?

Joao Henriques 2014-11-17

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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