This is a report, not a question. I'd like to post a pull request when I can fix it.
I was interested how many RTOSDemo projects for Renesas RL78 MCUs can be built with recent IDE and recent compiler because the following build problem was reported. So, I checked it. The result is the following.
IDE:
EWRL78 V4.20.1
Compiler:
ICCRL78 V4.20.1.2260 (included in EWRL78 V4.20.1)
Result:
EWRX
ICCRX
RL78_multiple_IAR Fail
RL78_RL78G13_Promo_Board_IAR Fail