Question

I have been trying to make an s-function block in matlab with my c++ codes.I am using the following mexopts.bat file

@echo off

set MATLAB=%MATLAB%

set PATH=%PATH%;c:\cygwin\bin

set MW_TARGET_ARCH=win64

set COMPILER=x86_64-w64-mingw32-g++

set COMPFLAGS=-c -fexceptions “-I%MATLAB%\extern\include”

set OPTIMFLAGS=-O3

set DEBUGFLAGS=-g -Wall

set NAME_OBJECT=-o

set PRELINK_CMDS1=echo EXPORTS > mex.def & echo mexFunction >> mex.def

set LIBLOC=”%MATLAB%\bin\win64″

set LINKER=x86_64-w64-mingw32-g++

set LINKFLAGS= -static-libgcc -shared mex.def -L%LIBLOC%
-static-libstdc++

set LINKFLAGSPOST= -lmex -lmx -lmwlapack -lmwblas -lstdc++

set LINKOPTIMFLAGS=-O3

set LINKDEBUGFLAGS= -g -Wall

set LINK_FILE=

set LINK_LIB=

set NAME_OUTPUT=-o “%OUTDIR%%MEX_NAME%%MEX_EXT%”

set RSP_FILE_INDICATOR=

set POSTLINK_CMDS1=del mex.def

I am able to successfully compile sample mexfunction file from matlab using the ‘mex’ function,But when i try compiling an s-function(i took the example files with matlab) i get the following errror

C:\Program Files\MATLAB\R2012a\simulink\include/simstruc.h:357:3: error: #error Must define one of RT, NRT, MATLAB_MEX_FILE, SL_INTERNAL, or FIPXT_SHARED_MODULE

C:\Program Files\MATLAB\R2012a\simulink\include/simstruc.h:467:78: fatal error: rt_matrx.h: No such file or directory
compilation terminated.

I am sure the c++ files are correct ,coz i took them from matlab examples

Answer 1

All S-Functions require the following preprocessor symbols to be defined.

MATLAB_MEX_FILE
S_FUNCTION_LEVEL=2
S_FUNCTION_NAME=<your-sfun-name>

Add those to the COMPFLAGS in your batch file using the -D directive.