About mex -setup

I am trying to build 'libsvmread.mex', 'libsvmwrite.mex', 'svmtrain.mex', and 'svmpredict.mex'in MATLAB 2018a. But I get the following error when I type

>> mex -setup
MEX configured to use 'MinGW64 Compiler (C)' for C language compilation.
Warning: The MATLAB C and Fortran API has changed to support MATLAB
   variables with more than 2^32-1 elements. You will be required
   to update your code to utilize the new API.

Answer 1

[Walter Roberson]

That is not an error. It is telling you that MinGW is set up as your compiler, and it is giving you a warning that if you have existing mex code that was developed assuming that pointers are 32 bits, that you will need to update your code. MATLAB started supporting 64 bit mex about a decade ago or so, so this is a warning for the situation where you are dealing with fairly old code.

The message you are getting is telling you that the setup functioned, and you should go ahead and use mex to build the functions.

[Ambika P S]

But should i not be creating libsvmread and libsvmclassify mex files once i run mex -setup ?

[Walter Roberson]

mex -setup does not do the compiling itself: it just configures the compilers to be ready for use. You would then proceed to do the compiling.

When I look online, it appears to me that you would cd to the directory that the source code is in, and at the MATLAB level give the command

make

and it should compile and build for you.

[Ambika P S]

But it is not compiling

>>  make
Building with 'MinGW64 Compiler (C)'.
Error: D:\Matlab\VMD\libsvm-3.23\matlab\make.m failed (line 13)
gcc: error: \-fexceptions: No such file or directory
=> Please check README for detailed instructions.

[xiaosong luo]

i am faced with the same question,did you solve it?

[xiaosong luo]

https://github.com/cjlin1/libsvm/issues/55

i think this answer will make a diffierence.