error LNK2019: unresolved external symbol emlrtReturnArrays

Question

Ion Iturbe 2017-2-10

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/324321-error-lnk2019-unresolved-external-symbol-emlrtreturnarrays

评论： Hao Ren 2018-5-9

Hello,

I'm generating C code from Matlab function.

I would like to test generated C code in Matlab, using a C mex function. I've seen that while generating code, an "interface" folder is also generated inside the "codegen" folder, so I tried to compile the mex function inside "codegen/interface/_coder_MyFunctionName_mex.c" file.

But I'm getting the "unresolved external symbol" error for allmost all the "emlrtXXX" functions.

Am I doing something wrong?

Regards,

Ion

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Answer 1

Michelle Wu 2017-2-17

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https://ww2.mathworks.cn/matlabcentral/answers/324321-error-lnk2019-unresolved-external-symbol-emlrtreturnarrays#answer_255270

The MATLAB Answers post attached below looks relevant to the error you saw:

http://www.mathworks.com/matlabcentral/answers/111767-mex-error-lnk2019-unresolved-external-symbol

The error looks like a linker related issue. You probably need to include all the necessary source files to the MEX command and compile them together.

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Ion Iturbe 2017-2-20

Hi,

Thank you for your answer but it doesn’t solve my problem.

I’m trying including different c files in mex command and so on, but I'm getting to some limits. I think we should look at this issue in two differents part:

1- Which is the exact mex command to use to generate mex function from a code generated by ecoder? It should be nice for everybody to have this command, I think.

2- I get to "unresolved external symbol" for "emlrtReturnArrays", "emlrtErrMsgIdAndTxt", and more "emlrt*" functions. This functions are declared in "emlrt.h" that I found in "C:\Program Files\MATLAB\R2016b\extern\include" but it looks like while linking they are not found. How can this problem be solved?

Regards,

Ion

Hao Ren 2018-5-9