mex failing to compile function

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Ron Crump 2025-9-30

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https://ww2.mathworks.cn/matlabcentral/answers/2180302-mex-failing-to-compile-function

评论： Robert 2025-10-28，15:42

采纳的回答： Ron Crump

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Hi.

I'm trying to compile functions previously compiled with mex in MATLAB

>> mex Cbetabinornd.cpp

Now gives the following error message:

Renamed options file '/Users/lfslbx/Library/Application Support/MathWorks/MATLAB/R2025b/mex_C++_maca64.xml' to '/Users/lfslbx/Library/Application Support/MathWorks/MATLAB/R2025b/mex_C++_maca64_backup.xml'.

Building with 'Xcode Clang++'.

Error using mex

Undefined symbols for architecture arm64:

"_mexCreateMexFunction", referenced from:

<initial-undefines>

"_mexDestroyMexFunction", referenced from:

<initial-undefines>

"_mexFunctionAdapter", referenced from:

<initial-undefines>

ld: symbol(s) not found for architecture arm64

clang++: error: linker command failed with exit code 1 (use -v to see invocation)

If I use the -v option there is a lot of information, I can paste it here if required.

I think this has happened since my last MacOS upgrade (to Sequoia 15.7) and/or xcode command line tools update (clang++ version 17.0.0).

I have tried uninstalling and reinstalling the xcode command line tools and have installed MATLAB 2025b (it was failing on 2023b also).

Any suggestions welcomed.

Thanks.

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Answer 1

Ron Crump 2025-10-8，12:48

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https://ww2.mathworks.cn/matlabcentral/answers/2180302-mex-failing-to-compile-function#answer_1570926

移动：Torsten 2025-10-8，12:51

The two .cpp files in question were using the C API. We have recoded them to use the C++ API and they now compile.

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Ron Crump 2025-10-10，11:04

Thanks, Bruno. Good to know.

Robert 2025-10-28，15:42

Thanks Bruno, fixed my problem with this message as well, for now.

FYI, on my 2024b LINKFLAGS didnt' work, I had to use LDFLAGS

also note the: ld: warning: -ld_classic is deprecated and will be removed in a future release

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