Mex Error: undeclared identifier What does this mean?

Prompt please. I want to make mex from csfunc.c, but the compiler gives out errors, why?

>>mex csfunc.c 
Error csfunc.c: 71 undeclared identifier `USE_DEFAULT_SIM_STATE' 
Warning csfunc.c: 71 possible usage of USE_DEFAULT_SIM_STATE before definition

Etc. still it is a lot of errors

Answer 1

[Kaustubha Govind]

This looks like Bug#661855. Install the patch to fix the issue.

Answer 2

[Yucel]

Do you have 64-bit operating system? In that case it's have some problems all the time.

Answer 3

[Martijn]

USE_DEFAULT_SIM_STATE is defined in simstruc.h so it sounds like you may be missing the following include in your C code:

#include "simstruc.h"

Usually it is best to base your C S-functions on one of the templates like simulink\src\sfuntmpl_basic.c which already has this include line.

Answer 4

[Natalia]

I have 32-bit windows 7, Matlab R2010b. I use a template simfeatures/src/csfunc.c and it includes #include "simstruc.h". I do mex on this template without changing it. Can try on XP?

Answer 5

[Natalia]

Thanks for the help. It is valid that is necessary.