Example is broken with gfortran 15

[eduardz1]

When trying to compile with gfortran 15 I get an error in the main.f90 file

/.../tests/main.f90:16:23:

   16 |     call run_testsuite(testsuites(is)%collect, error_unit, stat)
      |                       1
Error: Interface mismatch in dummy procedure ‘collect’ at (1): ALLOCATABLE mismatch in argument '_formal_1'

With gfortran 14 it compiles and runs fine though I get some warnings

/home/eduard/.cache/CPM/test-drive/79aa74869dae0cd30b19cb906f44b4f8ba3cf291/src/testdrive.F90:368:27:

  368 |     call collect(testsuite)
      |                           ^
Warning: ‘testsuite.dim[0].ubound’ may be used uninitialized [-Wmaybe-uninitialized]
/home/eduard/.cache/CPM/test-drive/79aa74869dae0cd30b19cb906f44b4f8ba3cf291/src/testdrive.F90:365:52:

  365 |     type(unittest_type), allocatable :: testsuite(:)
      |                                                    ^
note: ‘testsuite’ declared here
/home/eduard/.cache/CPM/test-drive/79aa74869dae0cd30b19cb906f44b4f8ba3cf291/src/testdrive.F90:368:27:

  368 |     call collect(testsuite)
      |                           ^
Warning: ‘testsuite.dim[0].lbound’ may be used uninitialized [-Wmaybe-uninitialized]
/home/eduard/.cache/CPM/test-drive/79aa74869dae0cd30b19cb906f44b4f8ba3cf291/src/testdrive.F90:365:52:

  365 |     type(unittest_type), allocatable :: testsuite(:)
      |                                                    ^
note: ‘testsuite’ declared here

[awvwgk]

This issue seems to be a bug in gfortran-15 when using -Wall which adds an option for extra interface checks rather than warnings.

Ref:

• mctc-lib 0.4.1 does not compile due to interface mismatch grimme-lab/mctc-lib#83
• dftd4 fails to build in Fedora rawhide dftd4/dftd4#294