S-Function wrapper not found when building in External mode

Hi,

I'm trying to run a Simulink file in external mode on a Beaglebone Black. In my Simulink file is an S-Function Builder block in which I've written, which compiles just fine by itself. However, when I hit "Build" for the whole .slx file, it fails to generate all binary outputs. The tail end of the diagnostic viewer output is:

 "### Creating standalone executable "../blacklinktest.elf" ..." 
  C:/MATLAB/SUPPOR~1/R2015b/LINARO~1.8/bin/arm-linux-gnueabihf-g++ -lm -lrt -lpthread -ldl -march=armv7-a -mfloat-abi=hard -mfpu=neon -mtune=cortex-a8 --sysroot="C:\MATLAB\SupportPackages\R2015b\beaglebone\toolbox\target\supportpackages\beaglebone\libc" -D_MW_ANALOG_INPUT_H_ -o ../blacklinktest.elf blacklinktest.c.o blacklinktest_data.c.o BBB_Driver_USRLED_wrapper.c.o myLTI_wrapper.pp.o linuxinitialize.c.o ert_main.c.o  -lm -lm
  blacklinktest.c.o: In function `blacklinktest_step': 
  blacklinktest.c:(.text+0x494): undefined reference to `myLTI_Outputs_wrapper' 
  blacklinktest.c.o: In function `blacklinktest_derivatives': 
  blacklinktest.c:(.text+0x5ca): undefined reference to `myLTI_Derivatives_wrapper' 
  collect2.exe: error: ld returned 1 exit status 
  gmake: *** [../blacklinktest.elf] Error 1
  ### Build procedure for model: 'blacklinktest' aborted due to an error.

"myLTI" is the name of my S-Function, and "blacklinktest.slx" is the name of my model. It seems like the S-Function wrappers are not being generated properly. Any suggestions for how I can fix this?

Edit: I have tried using another S-Function in my model, from the BLACKlink library available on MATLAB Central, and that works fine. However, my own S-Function Builder implementation doesn't work.

Answer 1

[Felix Kong]

Wrote another S-Function from scratch that does something similar, and that worked. Might be some error in my code for myLTI. Anyway, it works now.