Why Can't I build a C++ file using mex?

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Hamza Mahdi 2017-6-22

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评论： Bharath Swaminathan 2023-9-4

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I have a C++ file that I want to use with my matlab code. The file compiles using mex successfully when I use

mex -c Miguel_2D_unwrapper.cpp

But fails when I use

mex Miguel_2D_unwrapper.cpp

I get the following error:

Error using mex
Cannot export mexFunction: symbol not defined
collect2.exe: error: ld returned 1 exit status

I am sure the problem is not with the code. I am using MinGW and matlab 2017a

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Azuwien aida Bohari 2018-2-28

hi, me to experience the same error. i can compile imnov.c and mex complete successfully but fails when i want to compile comp.c and i get the same error.

Error using mex

Cannot export mexFunction: symbol not defined

collect2.exe: error: ld returned 1 exit status

can someone help me

Hamza Mahdi 2018-2-28

Hello Azuwein, I ran into the issue because I did not have a mexFunction() in the code. Try modifying your code to be the same as the one you can compile.

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回答（1 个）

Jan 2017-6-22

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Does the file contain the mexFunction() ? The error message tells clearly, that it doesn't.

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sana3 sal 2018-5-22

编辑：Walter Roberson 2018-5-23

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Hello there, could you please help me by mentioning where i have to but the mexFunction() ? which file? which diectory?

i have this problem when i ran vl_compilenn command to configure the MatConvNet library :

>> vl_compilenn
Building with 'MinGW64 Compiler (C++)'.
Error using mex
Cannot export mexFunction: symbol not defined
Cannot export mexfilerequiredapiversion: symbol not defined
collect2.exe: error: ld returned 1 exit status
Error in vl_compilenn>mex_compile (line 585)
mex(args{:}) ;
Error in vl_compilenn (line 493)
    mex_compile(opts, srcs{i}, objfile, flags) ;