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Compiling Matlab mex files with GCC for Windows

Asked by Wajahat on 17 May 2012
Latest activity Commented on by Wajahat on 7 Jul 2015
Hi I have been trying to configure Windows Matlab with GCC to compile mex files, through gnumex, http://gnumex.sourceforge.net/ but I get the following error,
C:\PROGRA~2\MATLAB\R2012A\BIN\MEX.PL: Error: Could not find specified options file 'mexopts.bat'.
mexopts.bet is created and is in the path.
Can someone help me on this?
Best Regards
Wajahat

  3 Comments

Not sure about gnumex, but you typically need to run the command "mex -setup" and select a supported compiler for the "mex" command to work.
Please check, do you have a .bat file or a .bet file?
I have a .bat file.
I can configure with MSVC++ compiler and mex runs perfectly. But a certain code is optimized for GCC and even after installation Matlab does not does GCC (although it does in Linux but not in Windows).
So in order to use GCC, I have to use gnumex. This is what I found on the web as the only way out. But that is also not working?

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2 Answers

Answer by Bruce Elliott on 6 Nov 2013

Wajahat,
Were you ever able to resolve this?
I would have asked if you were using the -f flag with your call to mex, which allows you to point to your mexopts.bat file.
Also, note that gnumex creates the mexopts.bat file in the folder you specify, which should be in your user space somewhere, but it also copies the file to %Matlab root%\bin\win64\ (or equivalent), to which you might not have write privileges.
Bruce

  1 Comment

I resolved it by selecting GCC compiler in gnumex. Earlier I was selecting MinGW. Thanks a lot for your answers Best Regards Wajahat

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Answer by Ora Zyto on 22 May 2012

Please note that you should only use a supported compiler when compiling MEX files, and directly modifying the mexopts.bat file is strongly discouraged and can lead to many issues. Refer to the supported compilers page for your architecture at: http://www.mathworks.com/support/compilers/R2012a/win32.html
MEX compilation relies on finding the appropriate mexopts.bat file in your preference directory. This can be located by typing the command:
>> prefdir
in your MATLAB command prompt. Running the command mex -setup will take care of setting this up correctly.

  1 Comment

yeah sure, I am not changing mexopts.bat myself but using gnumex to change it.

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