When building an On-Chip SDK project, you may see a warning like the following:

Warning[Lt009]: Inconsistent wchar_t size
assert.obj(libip_stack.a) and 239 other objects in 4 different libraries have wchar_t size 16 bits
gpio_app.o and 26 other objects, some of them in dl7M_tln.a and 8 other libraries have wchar_t size 32 bits

This occurs because the stack library was built using IAR 7.x, and the wchar_t size changed in IAR 8.x.  The stack and On-Chip SDK applications do not use wchar_t so it is safe to ignore this warning.

You can suppress it in the project settings:

For reference: IAR ARM C/C++ compiler Release Notes for 8.11