dftd4 and mctc-lib fail to compile in rawhide with gcc-gfortran-15.1.1-1.fc43 with an "Interface mismatch" error:

../app/argument.f90:114:53:

  114 |       call make_argument_list(new, argument_counter, argument_getter)
      |                                                     1
Error: Interface mismatch in dummy procedure ‘argument_getter’ at (1): ALLOCATABLE mismatch in argument '_formal_1'
../app/argument.f90:116:59:

  116 |       call make_argument_list(new, default_argument_count, get_default_argument)
      |                                                           1
Error: Interface mismatch in dummy procedure ‘argument_getter’ at (1): ALLOCATABLE mismatch in argument '_formal_1'


The codes in question use procedure pointers, which have been supported in at least four Fortran compilers for years. The error is only triggered when -Wall is present in the compiler flags.

<mock-chroot> sh-5.2# gfortran -c ../app/argument.f90
<mock-chroot> sh-5.2# gfortran -c -Wall ../app/argument.f90
../app/argument.f90:114:53:

  114 |       call make_argument_list(new, argument_counter, argument_getter)
      |                                                     1
Error: Interface mismatch in dummy procedure ‘argument_getter’ at (1): ALLOCATABLE mismatch in argument '_formal_1'
../app/argument.f90:116:59:

  116 |       call make_argument_list(new, default_argument_count, get_default_argument)
      |                                                           1
Error: Interface mismatch in dummy procedure ‘argument_getter’ at (1): ALLOCATABLE mismatch in argument '_formal_1'


I do not have a reduced test case, but the attached file from dftd4 is 364 lines and has no dependencies. The same codes compile in Fedora 41 and 40 without issues.

Reproducible: Always

Steps to Reproduce:
1. gfortran -c -Wall argument.f90

Actual Results:
Code does not compile

Expected Results:
Code compiles