We've gotten a couple E2E posts regarding the 7.4.xx codegen with DSP/BIOS 5.42.02. One has a compiler warning and the other a compiler error with building their applications (see below). Both had a working setup when using older codegen tools.

warning #16002-D: build attribute vendor section TI missing in
"C:/ti/ccs910/bios_5_42_02_10/packages/ti/rtdx/lib/c6000/rtdx64xplus.lib<rtd
x_mon.o64P>": compatibility cannot be determined

and 

"lab01ccfg.s62", ERROR!   at line 887: [E0003] Invalid constant specification
  SWI_Obj 1, KNL_swi, 0, _function, _pri, _mailbox, _arg0, _arg1, _dorta, _Order, _filter, _maxformat, _sumformat, _avgformat, _filtmaxmult, _filtsummult, _unittype

https://e2e.ti.com/support/tools/ccs/f/81/t/890788

https://e2e.ti.com/support/processors/f/791/t/890751