https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98384
--- Comment #15 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
printf("%L.1000f\n", 1.0L);
The length modifier needs to come after precision, not before it, so
you should be using
printf("%.1000Lf\n", 1.0L);
instead.
But the test nor libstdc++ itself doesn't do that, does it?
