I think I know the answer to this, but wanted to be sure before doing a bunch of work. I'm reading through application note AN5374 on using the eTPU libraries. The application note focuses on using S32 Design Studio, but references "Code Warrior eTPU Function Selection Tool." So will the functions downloaded with this tool work in an S32 Design Studio Project? The application note seemed a little vague on this point. I'm actually planning to use eTPU2+ in my project.
The answer is yes - it works with S32 Design Studio.
The ETPU package you download is already compiled by ETPU compiler (you can check etpu_set.h for the ETPU code binary image). Remaining .c and .h files is a "glue code" to interface ETPU with a host MCU.
In fact the ETPU functions (binary image) you download from web is compiled by CodeWarrior for ETPU. Therefore they reference it as "Code Warrior eTPU Function Selection Tool."