-_GL_FUNCDECL_SYS (wmemchr, wchar_t *, (const wchar_t *s, wchar_t c, size_t n));
-# endif
-_GL_CXXALIAS_SYS (wmemchr, wchar_t *, (const wchar_t *s, wchar_t c, size_t n));
+_GL_FUNCDECL_SYS (wmemchr, wchar_t *, (const wchar_t *s, wchar_t c, size_t n)
+ _GL_ATTRIBUTE_PURE);
+# endif
+ /* On some systems, this function is defined as an overloaded function:
+ extern "C++" {
+ const wchar_t * std::wmemchr (const wchar_t *, wchar_t, size_t);
+ wchar_t * std::wmemchr (wchar_t *, wchar_t, size_t);
+ } */
+_GL_CXXALIAS_SYS_CAST2 (wmemchr,
+ wchar_t *, (const wchar_t *, wchar_t, size_t),
+ const wchar_t *, (const wchar_t *, wchar_t, size_t));
+# if ((__GLIBC__ == 2 && __GLIBC_MINOR__ >= 10) && !defined __UCLIBC__) \
+ && (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 4))
+_GL_CXXALIASWARN1 (wmemchr, wchar_t *, (wchar_t *s, wchar_t c, size_t n));
+_GL_CXXALIASWARN1 (wmemchr, const wchar_t *,
+ (const wchar_t *s, wchar_t c, size_t n));
+# else