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Is it possible to build FORTRAN-only mex-files using GNU FORTRAN (gfortran) supplied with MinGW-w64 under Windows 10?

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Bernt Nilsson
Bernt Nilsson on 7 May 2018
Commented: Robert on 13 Sep 2020 at 16:31
Hello all,
I have a question about compiler support for Mex with Matlab R2018a under 64-bit Windows 10. We have a Matlab mex function that uses mixed C and FORTRAN source code. The mex gateway is written in C. Using the mingw-w64 compilers found as an Add-On in Matlab, this function compiles, links and works fine.
On the supported compilers page it is stated that the mingw-w64 C/C++ compilers are supported and that you can get them here: MinGW-w64 at the File Exchange. It is not stated that the GNU FORTRAN compiler (gfortran) is supported, but it is actually part of the distribution and the experience with our mixed C/FORTRAN mex-file above confirms that it works.
In the "Comments and Ratings" part of the MinGW-w64 page on the File Exchange the "Mathworks Supported Compilers Team" on 2017-07-18 said GNU FORTRAN is supported.
Now to my problem and question. I am trying to build a FORTRAN-only mex-file, but without success. It compiles fine, but when linking it fails. Furthermore, trying one of the supplied sample files, timestwo.F, doesn't work either. When compiling,
mex -c timestwo.F
I get:
Warning: Selected compiler 'MinGW64 Compiler (FORTRAN)' is not supported and no other supported compiler was found. For options, visit https://www.mathworks.com/support/compilers.
Building with 'MinGW64 Compiler (FORTRAN)'.
MEX completed successfully.
So mex reports that the compiler is not supported, even though it is said to be supported on the file exchange as per above. Also, the file is compiled and I get a timestwo.obj.
Trying to build the mex-file,
mex timestwo.F
I get:
Warning: Selected compiler 'MinGW64 Compiler (FORTRAN)' is not supported and no other supported compiler was found. For options, visit https://www.mathworks.com/support/compilers.
Error using mex
Cannot export mexFunction: symbol not defined
timestwo.obj:timestwo.F:(.text+0x43): undefined reference to `mexerrmsgidandtxt'
timestwo.obj:timestwo.F:(.text+0x69): undefined reference to `mexerrmsgidandtxt'
timestwo.obj:timestwo.F:(.text+0x71): undefined reference to `mxisnumeric'
timestwo.obj:timestwo.F:(.text+0x94): undefined reference to `mexerrmsgidandtxt'
timestwo.obj:timestwo.F:(.text+0x9c): undefined reference to `mxgetm730'
timestwo.obj:timestwo.F:(.text+0xa7): undefined reference to `mxgetn730'
timestwo.obj:timestwo.F:(.text+0xb9): undefined reference to `mxgetpr'
timestwo.obj:timestwo.F:(.text+0xd0): undefined reference to `mxcopyptrtoreal8730'
timestwo.obj:timestwo.F:(.text+0xe4): undefined reference to `mxcreatedoublematrix730'
timestwo.obj:timestwo.F:(.text+0xee): undefined reference to `mxgetpr'
timestwo.obj:timestwo.F:(.text+0x10f): undefined reference to `mxcopyreal8toptr730'
collect2.exe: error: ld returned 1 exit status
So my question is, is it possible to use the MinGW-w64 compiler with FORTRAN-only mex-files? It would (of course) be fantastic if it did, and I would be very grateful if someone could point me in the right direction.
Thanks for any input on this!
Bernt

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Accepted Answer

Sid Jhaveri
Sid Jhaveri on 9 May 2018
Hi Bernt,
Currently, MATLAB supports GNU FORTRAN only in Linux. MATLAB supports MinGW-w64 on Windows only for C/C++. For Windows, Intel Parallel studio XE and Intel Visual Fortran are supported Fortran compiler in MATLAB. For more information on supported compilers, you can visit https://www.mathworks.com/support/compilers.html

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dpb
dpb on 28 Sep 2018
"MATLAB supports GNU FORTRAN only in Linux. MATLAB supports MinGW-w64 on Windows only for C/C++."
This is totally rude and an unacceptable situation.
Rylan
Rylan on 8 Nov 2019
I have met the same problems recently. I have to compile both the .c and .F90 file. What really bothered me is that the .F90 file cannot be compiled by ifort, but can be compiled by gfortran. However, only ifort is suppoted for windows platform.
Robert
Robert on 13 Sep 2020 at 16:31
Mathworks needs to get with the program and support gfortran via mingw-w64. Ever since Intel removed their non-commerical academic research licence option, it now appears to me that Mathworks is getting some sort of monetary incentive to not support any other FORTRAN compiler on windows or macos. This is the type of behavior that drives people away from from MATLAB to alternatives like Octave or Python. MATLAB days are numbered, I know of a number engineering and physics departments that have replaced their courses that used MATLAB with Python -- eventually all those students will bring this to their employers who will be more than happy to save money and drop MATLAB.

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