How to specify relative code paths in S-function builder

When setting INC_PATH, etc. in the S-function builder, how do I specify that path relative to some path (preferably from the directory in which the model is stored).

Use case: The simulink model exists in a git repo that is clone by multiple users. The code in the S-function builder block depends on a fair bit of C code that is also in that repo (and hence at a known location relative to the model slx file). Forcing each user to go in and edit full paths for their machine is annoying to say the least.

Answer 1

[Les Beckham]

Have you tried the suggestion in this answer?

https://www.mathworks.com/matlabcentral/answers/1568023-how-to-specify-relative-search-path-in-s-function-builder-app#answer_1187640

[Brandon]

That doesn't work. Seems like very little documentation on the use of ENV_PATH. Those dialogs don't seem to be picking up any environment variables. Also tried just setting ENV_PATH to the project root directly, but that did not work either.

[Hua Bai]

Hi Brandon, did you set the environment variable before you use it?

For your example, I guess you missed the step of "setenv("PROJROOT", "path to your project root");".

One example which works on my side is attached, you need to run the following line in matlab command window before you build your s-function builder.

setenv("myProjPath", "path to the folder");