Cannot create mex file even though compiler installed and recognized

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Emil Partsch 2018-9-24

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https://ww2.mathworks.cn/matlabcentral/answers/420557-cannot-create-mex-file-even-though-compiler-installed-and-recognized

编辑： Emil Partsch 2018-9-25

I am trying to compile some mex files. Since I got an error, I tried the standard matlab test https://se.mathworks.com/help/matlab/matlab_external/build-an-executable-mex-file.html:

copyfile(fullfile(matlabroot,'extern','examples','refbook','timestwo.c'),'.','f')
mex timestwo.c

I get the following error:

Building with 'Xcode with Clang'.
Error using mex
'/path/timestwo.mexmaci64' is not a MEX file. For more information, see File is not a MEX file.
Error in mextest (line 2)
mex timestwo.c

Note that the path is correct and that the file is indeed there. I am not sure what could be wrong. I run the newest version of matlab and xcode on mac and my OS is High Sierra, version 10.13.6

Any help is highly appreciated :-)

Thanks in advance

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OCDER 2018-9-24

Can you show us the timestwo.c code? Or are you able to compile another mex code from the matlab examples?

Emil Partsch 2018-9-25

编辑：Emil Partsch 2018-9-25

在 MATLAB Online 中打开

I am able to compile other mex codes, but matlab won't recognize any mex compiled files.

Here is the timestwo.c code:

   #include "mex.h"
/*
* timestwo.c - example found in API guide
*
* Computational function that takes a scalar and doubles it.
*
* This is a MEX-file for MATLAB.
* Copyright 1984-2011 The MathWorks, Inc.
*/
 void timestwo(double y[], double x[])
{
  y[0] = 2.0*x[0];
}
 void mexFunction( int nlhs, mxArray *plhs[],
                  int nrhs, const mxArray *prhs[] )
{
  double *x,*y;
  size_t mrows,ncols;
/* Check for proper number of arguments. */
if(nrhs!=1) {
  mexErrMsgIdAndTxt( "MATLAB:timestwo:invalidNumInputs",
          "One input required.");
} else if(nlhs>1) {
  mexErrMsgIdAndTxt( "MATLAB:timestwo:maxlhs",
          "Too many output arguments.");
}
/* The input must be a noncomplex scalar double.*/
mrows = mxGetM(prhs[0]);
ncols = mxGetN(prhs[0]);
if( !mxIsDouble(prhs[0]) || mxIsComplex(prhs[0]) ||
    !(mrows==1 && ncols==1) ) {
  mexErrMsgIdAndTxt( "MATLAB:timestwo:inputNotRealScalarDouble",
          "Input must be a noncomplex scalar double.");
}
/* Create matrix for the return argument. */
plhs[0] = mxCreateDoubleMatrix((mwSize)mrows, (mwSize)ncols, mxREAL);
/* Assign pointers to each input and output. */
x = mxGetPr(prhs[0]);
y = mxGetPr(plhs[0]);
/* Call the timestwo subroutine. */
timestwo(y,x);
}