diff --git a/libstdc++-v3/include/bits/c++config b/libstdc++-v3/include/bits/c++config
index 46852d04b46..dfbe48c8f1f 100644
--- a/libstdc++-v3/include/bits/c++config
+++ b/libstdc++-v3/include/bits/c++config
@@ -314,12 +314,4 @@ _GLIBCXX_END_NAMESPACE
 #undef min
 #undef max
 
-#ifndef _GLIBCXX_PURE
-# define _GLIBCXX_PURE __attribute__ ((__pure__))
-#endif
-
-#ifndef _GLIBCXX_CONST
-# define _GLIBCXX_CONST __attribute__ ((__const__))
-#endif
-
 // End of prewritten config; the discovered settings follow.