bug#43579: g++ does not provide std::fegetround

[Ricardo Wurmus <rekado@elephly.net>]

Andreas Enge <andreas@enge.fr> writes:

> Hello,
>
> this report is related to
>    https://github.com/fplll/fplll/issues/444
>
> The following test file round.cpp does not compile with our g++-10.2.0:
> #include <cfenv>
> int main () {
>    return std::fegetround ();
> }
>
>
> Compilation (also when adding "--std=c++11") prints the error:
> round.cpp: In function 'int main()':
> round.cpp:4:16: error: 'fegetround' is not a member of 'std'; did you mean 'fegetround'?
>     4 |    return std::fegetround ();
>       |                ^~~~~~~~~~
> In file included from /home/andreas/.guix-profile/include/c++/fenv.h:36,
>                  from /home/andreas/.guix-profile/include/c++/cfenv:41,
>                  from round.cpp:1:
> /home/andreas/.guix-profile/include/fenv.h:104:12: note: 'fegetround' declared here
>   104 | extern int fegetround (void) __THROW __attribute_pure__;
>       |            ^~~~~~~~~~

Is this perhaps related to https://issues.guix.gnu.org/42392 ?

-- 
Ricardo