How to declare variables in C as int16/uint16/int32 etc, for S function

I'm writing some C code, to compile and use as an S function in simulink.

In normal C programming, I can just declare variables to be a certain size, like

int16 x = 5;
uint32 y = 7;

But when I try that in matlab, and compile it with

mex file.c file_wrapper.c

I get an error message:

unknown type name ‘int32’

I've tried `Int32' and `int_32' and neither works.

Is there some library I need to include?

Mex gives me the following warning. Is it related to this?

Warning: You are using gcc version '5.4.0'. The version of gcc is not supported. The version currently supported with MEX is
'4.7.x'.

Answer 1

[Matthew Davis]

I found the answer.

This stack overflow post explains.

• Add tmwtypes.h as a library
• Use `int32_T` as the type.