[PATCH] libstdc++: Support limited escaped formatting for non-unicode literals.

[Tomasz Kaminski]

On Fri, May 15, 2026 at 11:15 AM Jakub Jelinek <jakub@redhat.com> wrote:

> On Fri, May 15, 2026 at 11:07:40AM +0200, Tomasz Kamiński wrote:
> > --- /dev/null
> > +++ b/libstdc++-v3/testsuite/std/format/debug_nonunicode_neg.cc
> > @@ -0,0 +1,18 @@
> > +// { dg-options "-fexec-charset=ISO8859-1" }
>
> I think this should be ISO-8859-1 instead
>
We use the above name as an "exec-charset" and locale name in a few other
tests.
and they seem to work as expected. I think this is because  “Charset Alias
Matching” algorithm described
 in the Unicode Technical Standard (we use that in text_encoding) ignores
them,
but I will fix it.

>
> > +// { dg-do compile { target c++26 } }
> > +// { dg-require-effective-target cxx11_abi }
>
> I think this is missing
> // { dg-require-iconv "ISO-8859-1" }
> Not all target support all -fexec-charset= arguments.
>
Thanks will add that, and do separate commit also  fix other files.

>
>         Jakub
>
>
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