i want to clarify the Z-stack Home 1.2.0 has been released and product tested with IAR 8.20.2 IDE version.
This is what is stated in the Z-stack core and Z-stack home release note (available in the Z-stack install directory) and the main path we suggest our customers to take for their design.
IAR update releases and Z-stack updates are not always in sync and this is the reason why you may find sometimes that our SW product have not been compiled with the latest IAR version.
As Yikai mentioned, and hereby mentioned here now, we worked with IAR to enable our customers to evaluate our SW products and earlier eval versions of IAR are available. Please use this link
http://www.iar.com/Products/Wireless-solutions/Tools-for-TI-wireless/
This being said, if really you want to use the latest IAR version 8.30, the changes suggested in this post are a viable interim workaround, though probably not the final solution we are going to integrate.
We are of course going to migrate soon to the newest IAR version, as we want to maintain sync with all updates the IDE has but please understand sometimes the practicality of this to happen for all the platforms we have and the interim 'grace period' this entails.