Error using mex : "Undefined symbols for architecture x86_64: ... "

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Shima Asaadi
Shima Asaadi 2016-3-21
编辑： Shima Asaadi 2016-3-21
I am using MATLAB R2015b on Mac. I try to run a very simple cpp file using mex in MATLAB, like the following function:
#include "mex.h"
#include "stdio.h"
#include "iostream"
void testFile()
{
int i=4;
std::cout<<i;
}
But the following error occurs:
Building with 'Xcode Clang++'.
Error using mex
Undefined symbols for architecture x86_64:
"_mexFunction", referenced from:
-exported_symbol[s_list] command line option
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
However using "make testFile()" in Terminal works well. I studied some solutions in MathWorks but did not work.
Any help would be appreciated.
Thanks,

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采纳的回答

Steven Lord
Steven Lord 2016-3-21
You MUST define a function named mexFunction in your MEX-file and that function must have a specific signature. Your source code file does not define a function with that name, so it is not a valid MEX-file and when you attempt to build it as though it was a valid MEX-file the compiler correctly complains.
  2 个评论
James Tursa
James Tursa 2016-3-21
E.g.,
#include "mex.h"
#include "stdio.h"
#include "iostream"
void testFile()
{
int i=4;
std::cout<<i;
}
void mexFunction(int nlhs, mxArray *plhs[], int nrhs, const mxArray *prhs[])
{
testFile();
}
See this link:
http://www.mathworks.com/help/matlab/apiref/mexfunction.html?searchHighlight=mexfunction
Shima Asaadi
Shima Asaadi 2016-3-21
编辑：Shima Asaadi 2016-3-21
Many thanks to all.
And sorry for such a basic problem.

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