Using coder.cstructname is one means of integrating structs which are also used in external code. You could define the structure type in a header file, customDefs.h and then include the definition of that header in your MATLAB code like so:
function y = foom(x)
coder.cstructname(x, 'customImportedStruct', 'extern', 'HeaderFile', 'customDefs.h');
y = 2*x.fieldWithVeryVeryVeryVeryLongName;
and generate code:
str.fieldWithVeryVeryVeryVeryLongName = 12; codegen foom -args str -c -report
You will see that the field names are preserved and that the file foo_types.h includes customDefs.h.
This approach also lets you hand-tailor the typedef for your structure so that it is predictable and consistent across the generated code and your external code.
