The Intel® Parallel Studio XE 2017 or later versions for Fortran Windows* and Linux* have a feature enhancement supporting the Fortran 2008 standard BIND(C) on internal procedure.
This means you can pass an internal procedure, but not call it directly from outside its host. For example:
program main use foo_mod call set_func(func) contains real*8 function func() bind(c) func = 1.0 end function func end program main
Compile it with an older version of Intel Fortran Compiler there will be an error:
Error #8077: A proc-language-binding-spec shall not be specified for an internal procedure.
real*8 function func() bind(c)
Now with the feature enhancement, it can be accepted by Intel® Fortran compiler 17.0 or later versions.
Refer to the Intel® Parallel Studio XE 2019 (or later versions) for Fortran product documentation for additional details.