I would like to report a possible bug in the Intel Fortran compilers (both IFORT and IFX - version 2024.0.0) that relates to an abstract interface and submodule inheritance.
The attached code causes an internal compiler error. The problem appears to be relating to the callback procedure argument of the 'Proc_Engine_II' routine in the 'SubMod2' submodule.
Three workarounds that seem to solve the ICE problem are:
(1) Putting the 'Proc_Main_II' and 'Proc_Engine_II' routines in the 'SubMod1' submodule instead of the 'SubMod2' submodule.
(2) Define another abstract interface for the callback routine in the 'SubMod2' submodule (which is exactly the same as the one in the 'ModMain' module) and then use this abstract interface instead.
(3) Do not use the 'SubMod1' module as a parent submodule of the 'SubMod2' module.
However, in practice, these three workarounds would cause redundancy problems and/or very large file(s).
