Unexplained error while building DLL

I wish to convert my simulink model into a DLL for use with another s/w. When I try to build the model it simply says 'Error(s) encountered while building model'. When I run the model, there are no error messages. How can I find out what has gone wrong?

Thank you for your input guys.. I am using ert_shrlib.tlc for building the DLL. And thanks, I did find more information on the command window. The error which causes abort is 'Missing Exports'. It seems the '_filename_step' function doesnt have a definition along with '_rtU' and '_rtY'. When I checked the Code Generation report, the step function has been called within rt_OneStep, but there is no definition for the function to be found.

[Kaustubha Govind]

Are you using Ctrl+B or rtwbuild to generate the DLL? Are you using ert_shrlib.tlc as the System Target file, or something else? It is strange that you are not seeing the actual errors reported - nothing in the popup window or MATLAB command window?

[Albert Yam]

As Kaustubha mentioned, the popup window or the MATLAB command window should give more information. Sometimes one or the other is completely useless for information, but there should be something.

Also, you said while building model. Does that mean it got through the initial run? Did you see a lot of dots..................................................................?

[Arun]

I am using ert_shrlib.tlc for building the DLL. And thanks, I did find more information on the command window. The error which causes abort is 'Missing Exports'. It seems the '_filename_step' function doesnt have a definition along with '_rtU' and '_rtY'. When I checked the Code Generation report, the step function has been called within rt_OneStep, but there is no definition for the function to be found.

Answer 1

[Kaustubha Govind]

That's strange. Is there a model.c file generated? The model _step function should be generated into it?

Also, could you try this with a demo model, such as rtwdemo_counter (simply type the model name at the MATLAB prompt to open it up)?

[Arun]

Thank you for the suggestion. I did try it with demo models too. But had the same results.. model.c file is generated and the step function 'rtwdemo_counter_step();' is called within 'rt_OneStep'. But there is no definition of 'rtwdemo_counter_step(); available..

[Arun]

Command Window log:

### Starting Real-Time Workshop build procedure for model: rtwdemo_counter

D:/MATLAB~1\sys\lcc\bin\lcc -c -Fortwdemo_counter.obj -DMODEL=rtwdemo_counter -DNUMST=1 -DNCSTATES=0 -DMAT_FILE=0 -DINTEGER_CODE=0 -DONESTEPFCN=1 -DTERMFCN=1 -DHAVESTDIO -DMULTI_INSTANCE_CODE=0 -DMT=0 -I. -I.. -ID:/MATLAB~1\simulink\include -ID:/MATLAB~1\extern\include -ID:/MATLAB~1\rtw\c\src -ID:/MATLAB~1\rtw\c\libsrc -ID:/MATLAB~1\rtw\c\src\ext_mode\common -ID:/MATLAB~1\rtw\c\src\ext_mode\tcpip -ID:/MATLAB~1\rtw\c\src\ext_mode\serial -ID:/MATLAB~1\rtw\c\src\ext_mode\custom -ID:/Tmp_2DEL/rtwdemo_counter_ert_shrlib_rtw -ID:/Tmp_2DEL -ID:/MATLAB~1/toolbox/rtw/rtwdemos -ID:/MATLAB~1\sys\lcc\include -w -noregistrylookup rtwdemo_counter.c

D:/MATLAB~1\sys\lcc\bin\lcclnk -s -LD:/MATLAB~1\sys\lcc\lib -dll -o ../rtwdemo_counter_win32.dll rtwdemo_counter.obj lcc_dll_main.obj @rtwdemo_counter_ref.rsp rtwdemo_counter.def

Specified export _rtwdemo_counter_U is not defined

Specified export _rtwdemo_counter_Y is not defined

Specified export _rtwdemo_counter_step is not defined

Missing exports. Aborting

gmake: * [../rtwdemo_counter_win32.dll] Error 1

[Kaustubha Govind]

Very very strange. I wonder if something is corrupt with your installation? Do you have access to any other installation to try this out?

[Arun]

I checked the same with the installations on my colleagues PCs. I found that all the 2010a installation had this problem. And the 2009a version was working ok. So I guess there is reason to suspect the installation of 2010a package as we all used the same package. It is interesting that there were no errors shown during the install.

[Kaustubha Govind]

Arun: Could you try re-installing? If that doesn't work, please contact MathWorks Tech Support.