Spurious interface conflict warning

[IanH]

Current ifort/ifx (and many versions previous - I've tolerated this one for a while) generate a spurious "error #8000: conflict between local interface block and external ..." with the following example code (note need to compile twice). 

>mkdir build

>ifx /c /standard-semantics /check:all /warn:all file1.f90 file2.f90 /module:build\ /object:build\
Intel(R) Fortran Compiler for applications running on Intel(R) 64, Version 2024.2.0 Build 20240602
Copyright (C) 1985-2024 Intel Corporation. All rights reserved.

file2.f90(2): remark #7712: This variable has not been used.   [ARG_B]
RECURSIVE SUBROUTINE Factory(arg_b, arg_d)
-----------------------------^
file2.f90(2): remark #7712: This variable has not been used.   [ARG_D]
RECURSIVE SUBROUTINE Factory(arg_b, arg_d)
------------------------------------^

>ifx /c /standard-semantics /check:all /warn:all file1.f90 /module:build\ /object:build\
Intel(R) Fortran Compiler for applications running on Intel(R) 64, Version 2024.2.0 Build 20240602
Copyright (C) 1985-2024 Intel Corporation. All rights reserved.

file1.f90(21): error #8000:  There is a conflict between local interface block and external interface block.   [ARG_D]
    RECURSIVE SUBROUTINE Factory(arg_b, arg_d)
----------------------------------------^
compilation aborted for file1.f90 (code 1)

The warning disappears if the call to the external procedure inside the Proc module procedure is commented out.  In the original code, other trivial and seemingly unrelated changes also result in the warning going away, so something is not well.

[Devorah_H_Intel]

@IanH, Thank you for the test case and the bug report. I tested it internally and got the same results. This report has now been escalated to compiler engineering for a fix.