Updated (attached) patch and PR with FOrtran 2008 Standard support check via accessing imaginary part of complex number.

This check is formaly as since GCC-9.0 there almost all planning Fortran 2008 Standart features were implemented.
The version <sys-devel/gcc-9.0 are masked in portage tree.

According to 1 the one of the recent implemented GCC-gfortran Fortran 2008 feature is
"Accessing real and imaginary parts (since 9.0, 2018-11-01)"

The "Contiguous attribute" (since 4.6, 2010-06-21, the is_contiguous intrinsic has been implemented on 2019-01-07)
is more recent but harder to check.

I definitely must use another feature to check as -fcoarray=single is supported since GCC 4.6 while there are several Fortran features supported since GCC 9.0 :(

16.06.2022, 01:52, "Torokhov Sergey" <torokhov-s-a@yandex.ru>:

Currently the fortran-2.eclass Fortran compiler dialect is restricted with check of Fortran 2003 standard.
Some packages could require to check at least Fortran 2008 support.

The proposed attached patch offer to check Fortran 2008 compatibility via one of the new most notable feature - Coarrays support (parallel processing feature).
Besides the new test file the current check require the passing of GCC (gfortran) compiler option `-fcoarray=single` to check Fortran 2008 compatibility.

The same patch is available via GIthub pull request: https://github.com/gentoo/gentoo/pull/25920

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