Function 'version' not supported for code generation (R2021a)

Question

Ivans Chou 2023-8-23

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2012002-function-version-not-supported-for-code-generation-r2021a

评论： Richard McCormack 2023-8-24

For various reasons, I want my generated code to know which version of MATLAB codegen generated the code, because coder prior to R2023a would take a matlab function:

function [ a, b ] = foo ( c, d ) …

and generate it to

void foo( TypeC c, TypeDd, TypeA* a, TypeB* b);

but after R2023a, it would generate the function as:

TypeA foo( TypeC c, TypeD d, TypeB& b);

So it became necessary, in order to call functions generated a particular version of Matlab, I needed to know which version of coder generated the library, so I wrote a simple function that I asked coder to generate for me:

function [ n ] = mversion()
    v = extractBefore( version, ' ' );
    a = str2double(extractBefore( v, '.' )) * 1e9;     vb = extractAfter( v, '.');
    b = str2double(extractBefore( vb, '.' )) * 1e6;
    n = (a + b)/1e9;
end

This code generates into a C++ function perfectly fine in many versions of Matlab coder from R2021a through R2023a, except in a recent installation of Matlab R2021a (older version of Matlab necessary to match a customer's environment), I get the error

??? Function 'version' not supported for code generation

What would cause this to successfully generate in one installation of Matlab 2021a and not another?

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Ivans Chou 2023-8-23

Just as a sanity check, I ran the Coder Toolbox "Euclidean" example in my R2021a installation and it generated successfully, so it's installed correctly.