Segfault in simple use of codecvt<>

[Kristian Spangsege]

The code:

> #include <cwchar>
> #include <locale>
>
> int main()
> {
>   typedef std::codecvt<wchar_t, char, std::mbstate_t> cvt_type;
>   cvt_type const &cvt = std::use_facet<cvt_type>(std::locale("en_US"));
>   cvt.encoding();
>   return 0;
> }

System:

gcc (GCC) 4.1.1 20070105 (Red Hat 4.1.1-51)

Fedora Core release 6 (Zod)

Linux localhost.localdomain 2.6.20-1.2952.fc6 #1 SMP Wed May 16
18:59:18 EDT 2007 i686 i686 i386 GNU/Linux

I specify no flags when compiling.


The code works if I leave out "en_US":

>   cvt_type const &cvt = std::use_facet<cvt_type>(std::locale());
>   cvt.encoding();


It also works if the passed locale is not a temporary:

>   std::locale l("en_US");
>   cvt_type const &cvt = std::use_facet<cvt_type>(l);
>   cvt.encoding();


And if 'encoding' is called directly on the returned facet:

>   std::use_facet<cvt_type>(std::locale("en_US")).encoding();


As far as I know, a temporary is supposed to stay "alive" until the
end of the scope.

Regards,
Kristian