Bug#1118734: dh-fortran-mod fails to recognize the compiler on i386

[Adrian Bunk]

Package: dh-fortran-mod
Version: 0.52
Severity: serious
Tags: ftbfs
Control: affects -1 src:fortran-testdrive

https://buildd.debian.org/status/fetch.php?pkg=fortran-testdrive&arch=i386&ver=0.5.0-5&stamp=1761317425&raw=0

...
   dh_fortran_lib -a
dh_fortran_lib called with files () kwargs {'arch': True, 'flavor': None, 'preferred': None, 'sourcedir': 'debian/tmp', 'verbose': False, 'no_act': False, 'indep': False, 'package': None, 'remaining_packages': None, 'firstpackage': None, 'create_in_sourcedir': None, 'o__no_parallel': False, 'o__buildsystem': None, 'o__builddirectory': None}
Usage: dh_fortran_lib [OPTIONS] [FILES]...
Try 'dh_fortran_lib --help' for help.

Error: Either --flavor is set, or FC_FLAVOR or FC are defined in the environment
Traceback (most recent call last):
  File "/usr/share/dh-fortran/dhfortran/compilers.py", line 163, in get_flavor
    return get_fc_flavor(get_fc())
  File "/usr/share/dh-fortran/dhfortran/compilers.py", line 133, in get_fc_flavor
    raise Exception(f"Can't recognize compiler {fc}")
Exception: Can't recognize compiler i686-linux-gnu-gfortran-15
...


This is due to the following on i386:

$ dpkg-architecture -qDEB_HOST_MULTIARCH
i386-linux-gnu
$ dpkg-architecture -qDEB_HOST_GNU_TYPE
i686-linux-gnu
$