MATLAB Answers

1

MEX, Mingw and linking libraries

Asked by Krzysztof Fajst on 14 Jan 2016
Latest activity Answered by timo
on 28 Mar 2018
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

  4 Comments

Show 1 older comment
#define dgemm_ dgemm and using g++ fixed the compiling problem but unfortunately compiled mex is not running. So question remains: Are those libraries OK ??
Sorry, I do not know.
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.

Sign in to comment.

2 Answers

Answer by Guan claim on 25 Apr 2016

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

  0 Comments

Sign in to comment.


Answer by timo
on 28 Mar 2018

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

  0 Comments

Sign in to comment.