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virtualIOP=1 may cause build issues

From Shrivaj in chat:

I am trying to build an IOP model with virtualIOP=1. I am using the same IOP model that was run with with ADC/DAC cards with external clocks, but just replacing the no_sync=1 control block parameter with virtualIOP=1. I am getting the following error,

***ERROR: undefined symbols in the front-end code. make: *** [Makefile:58: a1iopvirtual] Error 1
11:57 PM

Screenshot_2021-11-18_at_2.07.34_PM

build_resutls.txt