mex with g++4.8 with Boost issues

I am trying to build a mex file on OS X with gnu++-4.8. But ending up with error msg. In the command line it links to libc++. I think libc++ is incompatible with gnu++-4.8. I thought this library will or should not get linked by this option nor should clang++ be used. I am confused by all the message below. Can some please help me wade through?

I have already posted two questions on similar topics but still struggling for a solution.

Thanks

    mex -v CXX='/usr/local/bin/g++-4.8 ' CXXFLAGS='-std=gnu++11' gl_file.cpp /Users/slib/io/glFile.cpp -I/Users/boost_1_51_0 -I/Users/slib/include -I/Users/matutils -I/Users/eigen-eigen-5097c01bcdc4

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:
   http://www.mathworks.com/help/matlab/matlab_external/upgrading-mex-files-to-use-64-bit-api.html.

No MEX options file identified; looking for an implicit selection.

... Looking for compiler 'Xcode Clang++' ...

... Looking for environment variable 'DEVELOPER_DIR' ...No.

... Executing command 'xcode-select -print-path' ...Yes ('/Applications/Xcode.app/Contents/Developer').

... Looking for folder '/Applications/Xcode.app/Contents/Developer' ...Yes.

... Executing command 'which xcrun' ...Yes ('/usr/bin/xcrun').

... Looking for folder '/usr/bin' ...Yes.

... Executing command 'defaults read com.apple.dt.Xcode IDEXcodeVersionForAgreedToGMLicense' ...No.

... Executing command 'defaults read /Library/Preferences/com.apple.dt.Xcode IDEXcodeVersionForAgreedToGMLicense' ...Yes ('7.3.1').

... Executing command '
agreed=7.3.1 
 if echo $agreed | grep -E '[\.\"]' >/dev/null; then 

   lhs=`expr "$agreed" : '\([0-9]*\)[\.].*'` 

    rhs=`expr "$agreed" : '[0-9]*[\.]\(.*\)$'` 

   if echo $rhs | grep -E '[\."]' >/dev/null; then 

   rhs=`expr "$rhs" : '\([0-9]*\)[\.].*'` 

   fi 

   if [ $lhs -gt 4 ] || ( [ $lhs -eq 4 ] && [ $rhs -ge 3 ] ); then 
   echo $agreed 

   else 

   exit 1

   fi 

   fi' ...Yes ('7.3.1').

... Executing command 'xcode-select -print-path' ...Yes ('/Applications/Xcode.app/Contents/Developer').

... Looking for folder 
'/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.9.sdk' ...No.

... Looking for folder '/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.10.sdk' ...No.

... Looking for folder '/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.11.sdk' ...Yes.

... Executing command 'xcode-select -print-path' ...Yes ('/Applications/Xcode.app/Contents/Developer').

... Looking for folder '/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.9.sdk' ...No.

... Looking for folder '/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.10.sdk' ...No.

... Looking for folder '/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.11.sdk' ...Yes.

... Executing command 'echo /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.11.sdk | rev | cut -c1-10 | rev | egrep -oh '[0-9]+\.[0-9]+'' ...Yes ('10.11').

Found installed compiler 'Xcode Clang++'.

Options file details
-------------------------------------------------------------------
  Compiler location: /Applications/Xcode.app/Contents/Developer

  Options file: /Applications/MATLAB_R2016a.app/bin/maci64/mexopts/clang++_maci64.xml

Compiler location: /Applications/Xcode.app/Contents/Developer

  Options file: /Applications/MATLAB_R2016a.app/bin/maci64/mexopts/clang++_maci64.xml

  CMDLINE200 : /usr/local/bin/g++-4.8  -Wl,-twolevel_namespace -undefined error -arch x86_64 -mmacosx-version-min=10.11 -Wl,-syslibroot,/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.11.sdk -framework Cocoa -bundle  -Wl,-exported_symbols_list,"/Applications/MATLAB_R2016a.app/extern/lib/maci64/mexFunction.map" -stdlib=libc++ -O -Wl,-exported_symbols_list,"/Applications/MATLAB_R2016a.app/extern/lib/maci64/mexFunction.map" /var/folders/_j/0zxcvyh55jnggzgr3x9zxfk9_43znl/T/mex_3401169421544_7178/gl_file.o /var/folders/_j/0zxcvyh55jnggzgr3x9zxfk9_43znl/T/mex_3401169421544_7178/glFile.o   -L"/Applications/MATLAB_R2016a.app/bin/maci64" -lmx -lmex -lmat -o ngl_file.mexmaci64

  CXX : /usr/local/bin/g++-4.8 

  DEFINES : -DMX_COMPAT_32   -DMATLAB_MEX_FILE 

  MATLABMEX : -DMATLAB_MEX_FILE 

  CXXFLAGS : -std=gnu++11

  INCLUDE : -I/Users/boost_1_51_0 -I/Users/slib/include -I/Users/matutils -I/Users/eigen-eigen-5097c01bcdc4  -I"/Applications/MATLAB_R2016a.app/extern/include" -I"/Applications/MATLAB_R2016a.app/simulink/include"

Answer 1

[gujax]

This is resolved. In Matlab R2016a mexopts.sh in ~/.matlab folder has no function. Do not create a copy of it. Instead one should edit the xml files in the .matlab/R2016 directory.

If xml files are not found they can be first generated using the mex -setup command.

mex -setup C++ |

will generate mex_C++_maci64.xml file.

If you want to use Clang then CXX and CXXFLAGS should be the default (which includes libc++ library).

If you have to use GNU gcc>4.2 then change CXX and CXXFLAGS in the xml file to that as in example above in the question asked. Also remove any mention of libc++ or remove instances of any 'not found xxx'.