MEX file maker not working when using < thread > header

I've made a fast version of accumarray in C++ and am trying to make a MEX file for it, but it is not working.

I can compile my code in MinGW via "g++ -m64 -std=c++11 -o accum Accumarray5.cpp"

The problem seems to be that I have included the header < thread > for its functions. I attempt to compile the MEX function in MATLAB using:

mex -v COMPFLAGS='$COMPFLAGS -std=c++11' Accumarray5.cpp

The error I get is:

Error using mex
In file included from C:/MATLAB/SupportPackages/R2015b/MW_MinGW_4_9/lib/gcc/x86_64-w64-mingw32/4.9.2/include/c++/thread:35:0,
                 from F:\Desktop\matlab codes\Radiation2\Accumarray5.cpp:6:
C:/MATLAB/SupportPackages/R2015b/MW_MinGW_4_9/lib/gcc/x86_64-w64-mingw32/4.9.2/include/c++/bits/c++0x_warning.h:32:2: error: #error This file requires compiler and library support for the ISO C++ 2011 standard. This support is currently experimental, and must be enabled with the -std=c++11 or
-std=gnu++11 compiler options.
 #error This file requires compiler and library support for the \
  ^
F:\Desktop\matlab codes\Radiation2\Accumarray5.cpp: In function 'void mexFunction(int, char**)':
F:\Desktop\matlab codes\Radiation2\Accumarray5.cpp:167:9: error: 'thread' was not declared in this scope
         thread t[thread_num]; // thread t[MAX_THREAD];
         ^
F:\Desktop\matlab codes\Radiation2\Accumarray5.cpp:172:53: error: 't' was not declared in this scope
                                                     t[i] = thread(accumulate, ind[k], vals[k], startind, endind, tmpSum[i]);    }
                                                     ^
F:\Desktop\matlab codes\Radiation2\Accumarray5.cpp:174:53: error: 't' was not declared in this scope
         for (int i = 0; i < thread_num; ++i)    {   t[i].join(); // wait for threads to finish execution
                                                     ^

The undeclared variables it is complaining about should not a problem because the functionality is described in the < thread > header.

Does anyone know what is wrong?

The other info spit out after my attempt at MEX file generation is:

Verbose mode is on.
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.
... Looking for compiler 'MinGW64 Compiler (C++)' ...
... Looking for environment variable 'MW_MINGW64_LOC' ...Yes ('C:\MATLAB\SupportPackages\R2015b\MW_MinGW_4_9').
... Looking for file 'C:\MATLAB\SupportPackages\R2015b\MW_MinGW_4_9\bin\g++.exe' ...Yes.
... Looking for folder 'C:\MATLAB\SupportPackages\R2015b\MW_MinGW_4_9\' ...Yes.
Found installed compiler 'MinGW64 Compiler (C++)'.
Set PATH = C:\MATLAB\SupportPackages\R2015b\MW_MinGW_4_9\\bin;C:\Program Files\MATLAB\R2015b\extern\include\win64;C:\Program Files\MATLAB\R2015b\extern\include;C:\Program Files\MATLAB\R2015b\simulink\include;C:\Program Files\MATLAB\R2015b\lib\win64;C:\Program Files\mingw-w64\x86_64-7.2.0-posix-seh-rt_v5-rev1\mingw64\bin;C:\ProgramData\Oracle\Java\javapath;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Program Files\MATLAB\R2015b\runtime\win64;C:\Program Files\MATLAB\R2015b\bin;C:\Program Files (x86)\MiKTeX 2.9\miktex\bin\;C:\Program Files (x86)\QuickTime\QTSystem\;C:\Users\Christopher\AppData\Local\Smartbar\Application\;C:\Program Files (x86)\NVIDIA Corporation\PhysX\Common;C:\Program Files\Git\cmd;C:\Program Files (x86)\Windows Kits\8.1\Windows Performance Toolkit\;C:\Program Files\Microsoft SQL Server\110\Tools\Binn\;C:\TDM-GCC-64\bin;C:\Program Files (x86)\Skype\Phone\;;C:\Program Files\Docker Toolbox;C:\TDM-GCC-64\bin;
Set INCLUDE = C:\MATLAB\SupportPackages\R2015b\MW_MinGW_4_9\\include;
Set LIB = C:\MATLAB\SupportPackages\R2015b\MW_MinGW_4_9\\lib;;
Set MW_TARGET_ARCH = win64;
Set LIBPATH = C:\Program Files\MATLAB\R2015b\extern\lib\win64;
Options file details
-------------------------------------------------------------------
  Compiler location: C:\MATLAB\SupportPackages\R2015b\MW_MinGW_4_9\
  Options file: C:\Users\Christopher\AppData\Roaming\MathWorks\MATLAB\R2015b\mex_C++_win64.xml
  CMDLINE1 : C:\MATLAB\SupportPackages\R2015b\MW_MinGW_4_9\\bin\g++ -c -DMX_COMPAT_32   -m64 -DMATLAB_MEX_FILE  -I"C:\Program Files\MATLAB\R2015b/extern/include" -I"C:\Program Files\MATLAB\R2015b/simulink/include" -fexceptions -fno-omit-frame-pointer -O -DNDEBUG "F:\Desktop\matlab codes\Radiation2\Accumarray5.cpp" -o C:\Users\CHRIST~1\AppData\Local\Temp\mex_6074947800533816_7768\Accumarray5.obj
  CMDLINE2 : C:\MATLAB\SupportPackages\R2015b\MW_MinGW_4_9\\bin\g++ -m64 -Wl,--no-undefined -shared -s -Wl,"C:\Program Files\MATLAB\R2015b/extern/lib/win64/mingw64/mexFunction.def" C:\Users\CHRIST~1\AppData\Local\Temp\mex_6074947800533816_7768\Accumarray5.obj   -L"C:\Program Files\MATLAB\R2015b\extern\lib\win64\mingw64" -llibmx -llibmex -llibmat -lm -llibmwlapack -llibmwblas -o Accumarray5.mexw64
  CXX : C:\MATLAB\SupportPackages\R2015b\MW_MinGW_4_9\\bin\g++
  COMPILER : C:\MATLAB\SupportPackages\R2015b\MW_MinGW_4_9\\bin\g++
  DEFINES : -DMX_COMPAT_32   -m64 -DMATLAB_MEX_FILE 
  MATLABMEX : -DMATLAB_MEX_FILE 
  CXXFLAGS : -fexceptions -fno-omit-frame-pointer
  INCLUDE : -I"C:\Program Files\MATLAB\R2015b/extern/include" -I"C:\Program Files\MATLAB\R2015b/simulink/include"
  CXXOPTIMFLAGS : -O -DNDEBUG
  CXXDEBUGFLAGS : -g
  LDXX : C:\MATLAB\SupportPackages\R2015b\MW_MinGW_4_9\\bin\g++
  LINKER : C:\MATLAB\SupportPackages\R2015b\MW_MinGW_4_9\\bin\g++
  LDFLAGS : -m64 -Wl,--no-undefined
  LDTYPE : -shared
  LINKEXPORT : -Wl,"C:\Program Files\MATLAB\R2015b/extern/lib/win64/mingw64/mexFunction.def"
  LIBLOC : C:\Program Files\MATLAB\R2015b\extern\lib\win64\mingw64
  LINKLIBS : -L"C:\Program Files\MATLAB\R2015b\extern\lib\win64\mingw64" -llibmx -llibmex -llibmat -lm -llibmwlapack -llibmwblas
  LDOPTIMFLAGS : -s
  LDDEBUGFLAGS : -g
  OBJEXT : .obj
  LDEXT : .mexw64
  SETENV : set COMPILER=g++ 
        set COMPFLAGS=-c -fexceptions -fno-omit-frame-pointer -DMX_COMPAT_32   -m64 -DMATLAB_MEX_FILE  -DMATLAB_MEX_FILE  
        set OPTIMFLAGS=-O -DNDEBUG 
        set DEBUGFLAGS=-g 
        set LINKER=g++ 
        set LINKFLAGS=-m64 -Wl,--no-undefined -shared -L"C:\Program Files\MATLAB\R2015b\extern\lib\win64\mingw64" -llibmx -llibmex -llibmat -lm -llibmwlapack -llibmwblas -Wl,"C:\Program Files\MATLAB\R2015b/extern/lib/win64/mingw64/mexFunction.def" 
        set LINKDEBUGFLAGS=-g
        set NAME_OUTPUT= -o "%OUTDIR%%MEX_NAME%%MEX_EXT%"
  MINGWROOT : C:\MATLAB\SupportPackages\R2015b\MW_MinGW_4_9\
  MATLABROOT : C:\Program Files\MATLAB\R2015b
  ARCH : win64
  SRC : "F:\Desktop\matlab codes\Radiation2\Accumarray5.cpp"
  OBJ : C:\Users\CHRIST~1\AppData\Local\Temp\mex_6074947800533816_7768\Accumarray5.obj
  OBJS : C:\Users\CHRIST~1\AppData\Local\Temp\mex_6074947800533816_7768\Accumarray5.obj 
  SRCROOT : F:\Desktop\matlab codes\Radiation2\Accumarray5
  DEF : C:\Users\CHRIST~1\AppData\Local\Temp\mex_6074947800533816_7768\Accumarray5.def
  EXP : Accumarray5.exp
  LIB : Accumarray5.lib
  EXE : Accumarray5.mexw64
  ILK : Accumarray5.ilk
  MANIFEST : Accumarray5.mexw64.manifest
  TEMPNAME : Accumarray5
  EXEDIR : 
  EXENAME : Accumarray5
  COMPFLAGS :  -std=c++11
  OPTIM : -O -DNDEBUG
  LINKOPTIM : -s

[Walter Roberson]

I notice that

set COMPFLAGS=-c -fexceptions -fno-omit-frame-pointer -DMX_COMPAT_32   -m64 -DMATLAB_MEX_FILE  -DMATLAB_MEX_FILE

does not have the flag you set, and that the later

COMPFLAGS : -std=c++11

has that flag but does not have the earlier flags even though you added them in.

Try editing

C:\Users\Christopher\AppData\Roaming\MathWorks\MATLAB\R2015b\mex_C++_win64.xml

[Christopher]

It would make complete sense if the -std=c++11 flag was the problem. The following is my xml file. How exactly should it be edited?

<?xml version="1.0" encoding="UTF-8" ?>
<config
    Name="MinGW64 Compiler (C++)"
    ShortName = "mingw64-g++"
    Manufacturer="GNU"
    Version="4.x"
    Language="C++"
    Priority="B"
    Location="$MINGWROOT" >
    <Details
        CompilerExecutable="$CXX"
        CompilerDefines="$DEFINES"
        CompilerFlags="$CXXFLAGS"
        OptimizationFlags="$CXXOPTIMFLAGS"
        DebugFlags="$CXXDEBUGFLAGS"
        IncludeFlags="$INCLUDE"
        LinkerExecutable="$LD"
        LinkerFlags="$LDFLAGS"
        LinkerLibraries="$LINKLIBS"
        LinkerOptimizationFlags="$LDOPTIMFLAGS"
        LinkerDebugFlags="$LDDEBUGFLAGS"
        CommandLineShell="set MINGW_ROOT_PATH=%MW_MINGW64_LOC%"
        CommandLineShellArg=""
        CompilerDefineFormatter="-D%s"
        LinkerLibrarySwitchFormatter="-l%s;-llib%s"
        LinkerPathFormatter="-L%s"
        LibrarySearchPath="$$LIB;$$LIBPATH;$$PATH;$$INCLUDE;$MATLABROOT\extern\lib\$ARCH\mingw"
    />
    <vars
          CMDLINE1="$CXX -c $DEFINES $INCLUDE $CXXFLAGS $OPTIM $SRC -o $OBJ"
          CMDLINE2="$LDXX $LDFLAGS $LDTYPE $LINKOPTIM $LINKEXPORT $OBJS $CXXLIBS $LINKLIBS -o $EXE"

            CXX="$MINGWROOT\bin\g++"
            COMPILER="$CXX"          
            DEFINES="-m64 $MATLABMEX"
            MATLABMEX="-DMATLAB_MEX_FILE "
            CXXFLAGS="-fexceptions -fno-omit-frame-pointer"
            INCLUDE="-I"$MATLABROOT/extern/include" -I"$MATLABROOT/simulink/include""
            CXXOPTIMFLAGS="-O -DNDEBUG"
            CXXDEBUGFLAGS="-g"

            LDXX="$CXX"
            LINKER="$LDXX"
            LDFLAGS="-m64 -Wl,--no-undefined"
            LDTYPE="-shared"
            LINKEXPORT="-Wl,"$MATLABROOT/extern/lib/win64/mingw64/mexFunction.def""
            LIBLOC="$MATLABROOT\extern\lib\win64\mingw64"
            LINKLIBS="-L"$MATLABROOT\extern\lib\$ARCH\mingw64" -llibmx -llibmex -llibmat -lm -llibmwlapack -llibmwblas"
            LDOPTIMFLAGS="-s"
            LDDEBUGFLAGS="-g"

            OBJEXT=".obj"
            LDEXT=".mexw64"
            SETENV="set COMPILER=g++ 
          set COMPFLAGS=-c $CXXFLAGS $DEFINES $MATLABMEX 
          set OPTIMFLAGS=$CXXOPTIMFLAGS 
          set DEBUGFLAGS=$CXXDEBUGFLAGS 
          set LINKER=g++ 
          set LINKFLAGS=$LDFLAGS $LDTYPE $LINKLIBS $LINKEXPORT 
          set LINKDEBUGFLAGS=$LDDEBUGFLAGS
          set NAME_OUTPUT= -o "%OUTDIR%%MEX_NAME%%MEX_EXT%""
      />
      <client>
          <engine
            LINKLIBS="$LINKLIBS -llibeng"
            LINKEXPORT=""
            LDEXT=".exe" 
            LINKTYPE=""
            MATLABMEX=""
            LDTYPE=""
          />
      </client>
      <locationFinder>
          <MINGWROOT>
              <and>
                  <envVarExists name="MW_MINGW64_LOC" />
                  <fileExists name="$$\bin\g++.exe" />
                  <dirExists name="$$\..\" />
              </and>
          </MINGWROOT>
      </locationFinder>
      <env
          PATH = "$MINGWROOT\bin;$MATLABROOT\extern\include\$ARCH;$MATLABROOT\extern\include;$MATLABROOT\simulink\include;$MATLABROOT\lib\$ARCH"
          INCLUDE = "$MINGWROOT\include"
          LIB = "$MINGWROOT\lib;"
          MW_TARGET_ARCH = "win64"
          LIBPATH="$MATLABROOT\extern\lib\win64"
      />
  </config>

[Walter Roberson]

Notice the

set COMPFLAGS=-c $CXXFLAGS $DEFINES $MATLABMEX

This suggests that instead of setting the COMPFLAGS variable in the mex compile line, that you should set CXXFLAGS instead.