Linker error compiling mex with mingw-w64

Question

I\'m trying to setup Mingw-w64 as the mex compiler in MATLAB 2013a. My laptop has x86_64 architecture and runs windows 7. The program I want to compile uses c++11-style thre

Answer 1

Take the following configuration file that I'm using (you'll need to adjust the path pointing to MinGW-w64 location accordingly):

mingw_mexopts.bat

@echo off

set MATLAB=%MATLAB%
set MW_TARGET_ARCH=win64
set PATH=C:\MinGW-w64\mingw64\bin;%PATH%

set COMPILER=x86_64-w64-mingw32-g++
set COMPFLAGS=-c -m64 -mwin32 -mdll -Wall -std=c++11 -DMATLAB_MEX_FILE
set OPTIMFLAGS=-DNDEBUG -O2
set DEBUGFLAGS=-g
set NAME_OBJECT=-o

set LINKER=x86_64-w64-mingw32-g++
set LINKFLAGS=-shared -L"%MATLAB%\extern\lib\win64\microsoft" -L"%MATLAB%\bin\win64"
set LINKFLAGSPOST=-lmx -lmex -lmat
set LINKOPTIMFLAGS=-O2
set LINKDEBUGFLAGS=-g
set LINK_FILE=
set LINK_LIB=
set NAME_OUTPUT=-o "%OUTDIR%%MEX_NAME%%MEX_EXT%"

Next here is a simple MEX-function that uses C++11 threads:

test.cpp

#include "mex.h"
#include 
#include 

void say_hello(int tid) {
    mexPrintf("hello from %d\n", tid);
}

void mexFunction(int nlhs, mxArray *plhs[], int nrhs, const mxArray *prhs[])
{
    std::vector threads;
    for (int i=0; i<10; i++) {
        threads.push_back(std::thread(say_hello, i));
    }        
    for(auto& t : threads) {
        t.join();
    }
}

Finally we compile and run it in MATLAB:

>> mex -f mingw_mexopts.bat -largeArrayDims test.cpp

>> setenv('PATH', ['C:\MinGW-w64\mingw64\bin;', getenv('PATH')])

>> test
hello from 0
hello from 4
hello from 2
hello from 3
hello from 5
hello from 1
hello from 6
hello from 8
hello from 7
hello from 9

Note that if you're going to deploy this to another machine, you'll have to also copy a few dependent DLL's (you'll find them in MinGW bin folder), and place them next to the MEX-file. Use Dependency Walker to list them. In my case it was:

• libstdc++-6.dll
• libgcc_s_seh-1.dll
• libwinpthread-1.dll

I am using GCC 4.8.2 with MATLAB R2014a running on 64-bit Windows.