[Bug libstdc++/114863] std::format applying grouping to nan's and inf's

[redi at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114863

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
--- a/libstdc++-v3/include/std/format
+++ b/libstdc++-v3/include/std/format
@@ -1734,7 +1734,7 @@ namespace __format
            }
 #endif

-         if (_M_spec._M_localized)
+         if (_M_spec._M_localized && __builtin_isfinite(__v))
            {
              __wstr = _M_localize(__str, __expc, __fc.locale());
              if (!__wstr.empty())