Why do I receive an error message when compiling a Simulink model with large C-MEX S-functions using the Real-Time Workshop?

Why do I receive an error message when compiling a Simulink model with large C-MEX S-functions using the Real-Time Workshop?

When compiling a large model that uses multiple S-functions (large C-files), sometimes I receive the following error message during the building process:

 ### Invoking Target Language Compiler on b1.rtw

 tlc -r b1.rtw C:\MATLAB\rtw\c\dos\drt.tlc -O. 

 -IC:\MATLAB\rtw\c\dos -IC:\MATLAB\rtw\c\tlc -aInlineParameters=0

 ### Loading TMW TLC function libraries

 ### Initial pass through model to cache user defined code

 ### Creating (RealTime) source file b1.c

 ### Creating source file b11.c (split at function boundary)

 ### Creating part 1 of registration file b1.reg

 ### Creating parameter file b1.prm

 ### Creating model header file b1.h

 ### Creating part 2 of registration file b1.reg

 ### TLC code generation complete.

 ### Creating project marker file: rtw_proj.tmw

 ### b1.mk which is generated from 

 C:\MATLAB\rtw\c\dos\drt_watc.tmf is up to date

 ### Building b1: wmake -f b1.mk 

 WATCOM Make Version 10.6 

 Copyright by WATCOM International Corp. 1988, 1996. All rights reserved. 

 WATCOM is a trademark of WATCOM International Corp. 

 ### Compiling b1.c 

 C:\WATCOM\binnt\wcc386 -zu -fpi87 -3s -oxat  

 -DMODEL=b1 -DRT -DNUMST=2 -DTID01EQ=1 -DNCSTATES=39  b1.c 

 WATCOM C32 Optimizing Compiler  Version 10.6  

 Copyright by WATCOM International Corp. 1984, 1996. 

 All rights reserved. 

 WATCOM is a trademark of WATCOM International Corp. 

 b1.c: 296057 lines, included 17481, 0 warnings, 0 errors

 b1.c(33911): Error! E1118: ***FATAL*** Object file too large 

 Error(E42): Last command making (b1.obj) returned a bad status 

 Error(E02): Make execution terminated

I have set the flag for file splitting (aFileSizeThreshold), but I continue to receive similar error messages. Is this a known problem? How can I fix this problem?

Answer 1

[MathWorks Support Team]

The ability to split generated code into separate files is not available in Real-Time Workshop.

Currently, to work around this issue, try manually partitioning the model with atomic subsystems. Each atomic subsystem block can specify a separate file, effectively splitting the code. This method also provides greater control over the file splitting process.