The check for C++14 was using the wrong date.
libstdc++-v3/ChangeLog:
* include/bits/c++config (_GLIBCXX14_DEPRECATED): Fix condition
checking for C++14.
# define _GLIBCXX11_DEPRECATED_SUGGEST(ALT)
#endif
-#if defined(__DEPRECATED) && (__cplusplus >= 201403L)
+#if defined(__DEPRECATED) && (__cplusplus >= 201402L)
# define _GLIBCXX14_DEPRECATED _GLIBCXX_DEPRECATED
# define _GLIBCXX14_DEPRECATED_SUGGEST(ALT) _GLIBCXX_DEPRECATED_SUGGEST(ALT)
#else
# define _GLIBCXX17_DEPRECATED_SUGGEST(ALT)
#endif
-#if defined(__DEPRECATED) && (__cplusplus > 201703L)
+#if defined(__DEPRECATED) && (__cplusplus >= 202002L)
# define _GLIBCXX20_DEPRECATED(MSG) [[deprecated(MSG)]]
# define _GLIBCXX20_DEPRECATED_SUGGEST(ALT) _GLIBCXX_DEPRECATED_SUGGEST(ALT)
#else