matlab coder requirements stricter than normal matlab

[poster]

Consider the following matlab program:

function results = prog()

    opts.x = 1;

    if ~isfield(opts, 'y'); opts.y = 1; end

    'asdf'

return

I am able to run this program successfully in matlab however when I try to use coder to convert it to C I get the following error:

This structure does not have a field 'y'; new fields cannot be added when structure has been read or used.

I would like to know if there is a way to convert to C using coder (or possible some other tool) that does not use a stricter compiler as seems to be the case with coder as I am using it. I am using matlab version R2019B.

Please note that this is just one of many examples of how coder is using a stricter compiler than normal matlab. I have a fairly large program that I would like to convert to C and I don't want to have to go through each error (there are over 100).

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