[Bug libstdc++/101234] New: Two tests require en_US.ISO-8859-15 but glibc no longer installs that by default.

[zarniwhoop at ntlworld dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101234

            Bug ID: 101234
           Summary: Two tests require en_US.ISO-8859-15 but glibc no
                    longer installs that by default.
           Product: gcc
           Version: 11.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libstdc++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: zarniwhoop at ntlworld dot com
  Target Milestone: ---

In 22_locale/codecvt/out/wchar_t/3.cc and 22_locale/codecvt/in/wchar_t/3.cc the
tests are only run if dejagnu finds the en_US.ISO-8859-15 locale. I assume that
glibc used to install that when installing all locales (e.g.
[https://centos.pkgs.org/8-stream/centos-baseos-x86_64/glibc-langpack-en-2.28-155.el8.x86_64.rpm.html]
implies that), but recent glibc does not automatically install it.

My earliest available old system is using glibc-2.30 and there that locale was
not installed when I installed all locales.

Manually installing it on a current system with glibc-2.33, the number of
expected passes increased by 4 so the tests do still work, it is just that most
builders will not run them.

If I'm reading the tests correctly, they convert the whole character-set.
Perhaps they could be converted to use one of the @euro locales which are still
installed automatically by glibc ?  I see that at least de_DE@euro and
es_ES@euro are in that category and alreadty used by other tests.