MEX, Mingw and linking libraries

I'm trying to compile some code under win7 64bit with MATLAB which compiles well under Linux. For this I use MEX with Mingw and gcc compiler.

My original Linux MEX command was looking like this

mex  CFLAGS="\$CFLAGS -Wall -fomit-frame-pointer -m32 -msse2 -mfpmath=sse -ffast-math" -lmwblas -lmwlapack -lmx -lmex -lmat -lm hkmeans_predict_dense.cpp

so I converted it to link a libraries from MATLAB directory

mex -f mingw.bat -L"C:\Program Files\MATLAB\MATLAB Production Server\R2015a\extern\lib\win64\microsoft\" CFLAGS="\$CFLAGS -Wall -fomit-frame-pointer -m32 -msse2 -mfpmath=sse -ffast-math" -lmwblas -lmwlapack -lmx -lmex -lmat hkmeans_predict_dense.cpp

I don't get any error about missing library but I'm getting undefined reference to `dgemm_' which points to some missing lapack function.

So my question is:

1) Was it OK to link libraries from MATLAB win64\microsoft\ directory but using gcc compiler ?? Are they compatibile with gcc ??

2) if not from where I can get such prebuild libraries for gcc under windows ??

Krzysztof

[Walter Roberson]

Notice the #define used in http://uk.mathworks.com/matlabcentral/answers/252395-calling-lapack-in-mex-files . The reverse of it would be that if you have coded in terms of dgemm_ then on Windows you would need to #define that in terms of dgemm

[Krzysztof Fajst]

#define dgemm_ dgemm and using g++ fixed the compiling problem but unfortunately compiled mex is not running. So question remains: Are those libraries OK ??

[Walter Roberson]

Sorry, I do not know.

[Yatin]

Hello Krzysztof,

You should not be linking against the libraries in $matlabroot\extern\lib\win64\microsoft folder when using MinGW Compiler. Instead you should link against the libraries in the folder $matlabroot\extern\lib\win64\mingw64 when using MinGW Compiler.

Hope this helps.

Answer 1

[Guan claim]

Sorry~ I don't understand that what library it is to contain these orders. is it the blas library?

Answer 2

[timo]

I think MSVC and MinGW operate differently w.r.t. expected extensions. While MSVC normally creates static libraries with a .lib extension, MinGW/MSYS respects the Unix defaults and requires a .a