Index: libcxx/docs/UsingLibcxx.rst
===================================================================
--- libcxx/docs/UsingLibcxx.rst
+++ libcxx/docs/UsingLibcxx.rst
@@ -242,11 +242,11 @@
   purely as an extension. See :ref:`Extended Applications of [[nodiscard]] <nodiscard extension>`
   for more information.
 
-**_LIBCPP_ENABLE_DEPRECATION_WARNINGS**:
-  This macro enables warnings when using deprecated components. For example,
-  when compiling in C++11 mode, using `std::auto_ptr` with the macro defined
-  will trigger a warning saying that `std::auto_ptr` is deprecated. By default,
-  this macro is not defined.
+**_LIBCPP_DISABLE_DEPRECATION_WARNINGS**:
+  This macro disables warnings when using deprecated components. For example,
+  using `std::auto_ptr` when compiling in C++11 mode will normally trigger a
+  warning saying that `std::auto_ptr` is deprecated. If the macro is defined,
+  no warning will be emitted. By default, this macro is not defined.
 
 C++17 Specific Configuration Macros
 -----------------------------------
Index: libcxx/include/__config
===================================================================
--- libcxx/include/__config
+++ libcxx/include/__config
@@ -1025,8 +1025,10 @@
 #endif
 
 // Deprecation macros.
-// Deprecations warnings are only enabled when _LIBCPP_ENABLE_DEPRECATION_WARNINGS is defined.
-#if defined(_LIBCPP_ENABLE_DEPRECATION_WARNINGS)
+//
+// Deprecations warnings are always enabled, except when users explicitly opt-out
+// by defining _LIBCPP_DISABLE_DEPRECATION_WARNINGS.
+#if !defined(_LIBCPP_DISABLE_DEPRECATION_WARNINGS)
 #  if __has_attribute(deprecated)
 #    define _LIBCPP_DEPRECATED __attribute__ ((deprecated))
 #  elif _LIBCPP_STD_VER > 11
Index: libcxx/test/libcxx/algorithms/alg.modifying.operations/alg.random.shuffle/random_shuffle.cxx1z.pass.cpp
===================================================================
--- libcxx/test/libcxx/algorithms/alg.modifying.operations/alg.random.shuffle/random_shuffle.cxx1z.pass.cpp
+++ libcxx/test/libcxx/algorithms/alg.modifying.operations/alg.random.shuffle/random_shuffle.cxx1z.pass.cpp
@@ -26,6 +26,7 @@
 
 // MODULES_DEFINES: _LIBCPP_ENABLE_CXX17_REMOVED_RANDOM_SHUFFLE
 #define _LIBCPP_ENABLE_CXX17_REMOVED_RANDOM_SHUFFLE
+#define _LIBCPP_DISABLE_DEPRECATION_WARNINGS
 
 #include <algorithm>
 #include <vector>
Index: libcxx/test/libcxx/algorithms/alg.modifying.operations/alg.random.shuffle/random_shuffle.depr_in_cxx14.fail.cpp
===================================================================
--- libcxx/test/libcxx/algorithms/alg.modifying.operations/alg.random.shuffle/random_shuffle.depr_in_cxx14.fail.cpp
+++ libcxx/test/libcxx/algorithms/alg.modifying.operations/alg.random.shuffle/random_shuffle.depr_in_cxx14.fail.cpp
@@ -21,9 +21,7 @@
 // UNSUPPORTED: c++98, c++03, c++11
 // REQUIRES: verify-support
 
-// MODULES_DEFINES: _LIBCPP_ENABLE_DEPRECATION_WARNINGS
 // MODULES_DEFINES: _LIBCPP_ENABLE_CXX17_REMOVED_RANDOM_SHUFFLE
-#define _LIBCPP_ENABLE_DEPRECATION_WARNINGS
 #define _LIBCPP_ENABLE_CXX17_REMOVED_RANDOM_SHUFFLE
 
 #include <algorithm>
Index: libcxx/test/libcxx/depr/depr.auto.ptr/auto.ptr/auto_ptr.cxx1z.pass.cpp
===================================================================
--- libcxx/test/libcxx/depr/depr.auto.ptr/auto.ptr/auto_ptr.cxx1z.pass.cpp
+++ libcxx/test/libcxx/depr/depr.auto.ptr/auto.ptr/auto_ptr.cxx1z.pass.cpp
@@ -16,8 +16,8 @@
 //  is defined before including <memory>, then auto_ptr will be restored.
 
 // MODULES_DEFINES: _LIBCPP_ENABLE_CXX17_REMOVED_AUTO_PTR
-
 #define _LIBCPP_ENABLE_CXX17_REMOVED_AUTO_PTR
+#define _LIBCPP_DISABLE_DEPRECATION_WARNINGS
 
 #include <memory>
 #include <type_traits>
Index: libcxx/test/libcxx/depr/depr.auto.ptr/auto.ptr/auto_ptr.depr_in_cxx11.fail.cpp
===================================================================
--- libcxx/test/libcxx/depr/depr.auto.ptr/auto.ptr/auto_ptr.depr_in_cxx11.fail.cpp
+++ libcxx/test/libcxx/depr/depr.auto.ptr/auto.ptr/auto_ptr.depr_in_cxx11.fail.cpp
@@ -22,9 +22,7 @@
 // UNSUPPORTED: c++98, c++03
 // REQUIRES: verify-support
 
-// MODULES_DEFINES: _LIBCPP_ENABLE_DEPRECATION_WARNINGS
 // MODULES_DEFINES: _LIBCPP_ENABLE_CXX17_REMOVED_AUTO_PTR
-#define _LIBCPP_ENABLE_DEPRECATION_WARNINGS
 #define _LIBCPP_ENABLE_CXX17_REMOVED_AUTO_PTR
 
 #include <memory>
Index: libcxx/test/libcxx/depr/depr.function.objects/adaptors.depr_in_cxx11.fail.cpp
===================================================================
--- libcxx/test/libcxx/depr/depr.function.objects/adaptors.depr_in_cxx11.fail.cpp
+++ libcxx/test/libcxx/depr/depr.function.objects/adaptors.depr_in_cxx11.fail.cpp
@@ -12,9 +12,7 @@
 // UNSUPPORTED: c++98, c++03
 // REQUIRES: verify-support
 
-// MODULES_DEFINES: _LIBCPP_ENABLE_DEPRECATION_WARNINGS
 // MODULES_DEFINES: _LIBCPP_ENABLE_CXX17_REMOVED_BINDERS
-#define _LIBCPP_ENABLE_DEPRECATION_WARNINGS
 #define _LIBCPP_ENABLE_CXX17_REMOVED_BINDERS
 
 #include <functional>
Index: libcxx/test/libcxx/depr/depr.function.objects/depr.adaptors.cxx1z.pass.cpp
===================================================================
--- libcxx/test/libcxx/depr/depr.function.objects/depr.adaptors.cxx1z.pass.cpp
+++ libcxx/test/libcxx/depr/depr.function.objects/depr.adaptors.cxx1z.pass.cpp
@@ -15,6 +15,7 @@
 
 // MODULES_DEFINES: _LIBCPP_ENABLE_CXX17_REMOVED_BINDERS
 #define _LIBCPP_ENABLE_CXX17_REMOVED_BINDERS
+#define _LIBCPP_DISABLE_DEPRECATION_WARNINGS
 
 #include <functional>
 #include <cassert>
Index: libcxx/test/std/depr/depr.lib.binders/depr.lib.bind.1st/bind1st.depr_in_cxx11.fail.cpp
===================================================================
--- libcxx/test/std/depr/depr.lib.binders/depr.lib.bind.1st/bind1st.depr_in_cxx11.fail.cpp
+++ libcxx/test/std/depr/depr.lib.binders/depr.lib.bind.1st/bind1st.depr_in_cxx11.fail.cpp
@@ -14,9 +14,7 @@
 // UNSUPPORTED: c++98, c++03
 // REQUIRES: verify-support
 
-// MODULES_DEFINES: _LIBCPP_ENABLE_DEPRECATION_WARNINGS
 // MODULES_DEFINES: _LIBCPP_ENABLE_CXX17_REMOVED_BINDERS
-#define _LIBCPP_ENABLE_DEPRECATION_WARNINGS
 #define _LIBCPP_ENABLE_CXX17_REMOVED_BINDERS
 
 #include <functional>
Index: libcxx/test/std/depr/depr.lib.binders/depr.lib.bind.2nd/bind2nd.depr_in_cxx11.fail.cpp
===================================================================
--- libcxx/test/std/depr/depr.lib.binders/depr.lib.bind.2nd/bind2nd.depr_in_cxx11.fail.cpp
+++ libcxx/test/std/depr/depr.lib.binders/depr.lib.bind.2nd/bind2nd.depr_in_cxx11.fail.cpp
@@ -14,9 +14,7 @@
 // UNSUPPORTED: c++98, c++03
 // REQUIRES: verify-support
 
-// MODULES_DEFINES: _LIBCPP_ENABLE_DEPRECATION_WARNINGS
 // MODULES_DEFINES: _LIBCPP_ENABLE_CXX17_REMOVED_BINDERS
-#define _LIBCPP_ENABLE_DEPRECATION_WARNINGS
 #define _LIBCPP_ENABLE_CXX17_REMOVED_BINDERS
 
 #include <functional>
Index: libcxx/test/std/depr/depr.lib.binders/depr.lib.binder.1st/binder1st.depr_in_cxx11.fail.cpp
===================================================================
--- libcxx/test/std/depr/depr.lib.binders/depr.lib.binder.1st/binder1st.depr_in_cxx11.fail.cpp
+++ libcxx/test/std/depr/depr.lib.binders/depr.lib.binder.1st/binder1st.depr_in_cxx11.fail.cpp
@@ -14,9 +14,7 @@
 // UNSUPPORTED: c++98, c++03
 // REQUIRES: verify-support
 
-// MODULES_DEFINES: _LIBCPP_ENABLE_DEPRECATION_WARNINGS
 // MODULES_DEFINES: _LIBCPP_ENABLE_CXX17_REMOVED_BINDERS
-#define _LIBCPP_ENABLE_DEPRECATION_WARNINGS
 #define _LIBCPP_ENABLE_CXX17_REMOVED_BINDERS
 
 #include <functional>
Index: libcxx/test/std/depr/depr.lib.binders/depr.lib.binder.2nd/binder2nd.depr_in_cxx11.fail.cpp
===================================================================
--- libcxx/test/std/depr/depr.lib.binders/depr.lib.binder.2nd/binder2nd.depr_in_cxx11.fail.cpp
+++ libcxx/test/std/depr/depr.lib.binders/depr.lib.binder.2nd/binder2nd.depr_in_cxx11.fail.cpp
@@ -14,9 +14,7 @@
 // UNSUPPORTED: c++98, c++03
 // REQUIRES: verify-support
 
-// MODULES_DEFINES: _LIBCPP_ENABLE_DEPRECATION_WARNINGS
 // MODULES_DEFINES: _LIBCPP_ENABLE_CXX17_REMOVED_BINDERS
-#define _LIBCPP_ENABLE_DEPRECATION_WARNINGS
 #define _LIBCPP_ENABLE_CXX17_REMOVED_BINDERS
 
 #include <functional>
Index: libcxx/test/std/utilities/function.objects/negators/binary_negate.depr_in_cxx17.fail.cpp
===================================================================
--- libcxx/test/std/utilities/function.objects/negators/binary_negate.depr_in_cxx17.fail.cpp
+++ libcxx/test/std/utilities/function.objects/negators/binary_negate.depr_in_cxx17.fail.cpp
@@ -15,9 +15,6 @@
 // UNSUPPORTED: c++98, c++03, c++11, c++14
 // REQUIRES: verify-support
 
-// MODULES_DEFINES: _LIBCPP_ENABLE_DEPRECATION_WARNINGS
-#define _LIBCPP_ENABLE_DEPRECATION_WARNINGS
-
 #include <functional>
 
 #include "test_macros.h"
Index: libcxx/test/std/utilities/function.objects/negators/binary_negate.pass.cpp
===================================================================
--- libcxx/test/std/utilities/function.objects/negators/binary_negate.pass.cpp
+++ libcxx/test/std/utilities/function.objects/negators/binary_negate.pass.cpp
@@ -10,6 +10,8 @@
 
 // binary_negate
 
+#define _LIBCPP_DISABLE_DEPRECATION_WARNINGS
+
 #include <functional>
 #include <type_traits>
 #include <cassert>
Index: libcxx/test/std/utilities/function.objects/negators/not1.depr_in_cxx17.fail.cpp
===================================================================
--- libcxx/test/std/utilities/function.objects/negators/not1.depr_in_cxx17.fail.cpp
+++ libcxx/test/std/utilities/function.objects/negators/not1.depr_in_cxx17.fail.cpp
@@ -15,9 +15,6 @@
 // UNSUPPORTED: c++98, c++03, c++11, c++14
 // REQUIRES: verify-support
 
-// MODULES_DEFINES: _LIBCPP_ENABLE_DEPRECATION_WARNINGS
-#define _LIBCPP_ENABLE_DEPRECATION_WARNINGS
-
 #include <functional>
 
 #include "test_macros.h"
Index: libcxx/test/std/utilities/function.objects/negators/not1.pass.cpp
===================================================================
--- libcxx/test/std/utilities/function.objects/negators/not1.pass.cpp
+++ libcxx/test/std/utilities/function.objects/negators/not1.pass.cpp
@@ -10,6 +10,8 @@
 
 // not1
 
+#define _LIBCPP_DISABLE_DEPRECATION_WARNINGS
+
 #include <functional>
 #include <cassert>
 
Index: libcxx/test/std/utilities/function.objects/negators/not2.depr_in_cxx17.fail.cpp
===================================================================
--- libcxx/test/std/utilities/function.objects/negators/not2.depr_in_cxx17.fail.cpp
+++ libcxx/test/std/utilities/function.objects/negators/not2.depr_in_cxx17.fail.cpp
@@ -15,9 +15,6 @@
 // UNSUPPORTED: c++98, c++03, c++11, c++14
 // REQUIRES: verify-support
 
-// MODULES_DEFINES: _LIBCPP_ENABLE_DEPRECATION_WARNINGS
-#define _LIBCPP_ENABLE_DEPRECATION_WARNINGS
-
 #include <functional>
 
 #include "test_macros.h"
Index: libcxx/test/std/utilities/function.objects/negators/not2.pass.cpp
===================================================================
--- libcxx/test/std/utilities/function.objects/negators/not2.pass.cpp
+++ libcxx/test/std/utilities/function.objects/negators/not2.pass.cpp
@@ -10,6 +10,8 @@
 
 // not2
 
+#define _LIBCPP_DISABLE_DEPRECATION_WARNINGS
+
 #include <functional>
 #include <cassert>
 
Index: libcxx/test/std/utilities/function.objects/negators/unary_negate.depr_in_cxx17.fail.cpp
===================================================================
--- libcxx/test/std/utilities/function.objects/negators/unary_negate.depr_in_cxx17.fail.cpp
+++ libcxx/test/std/utilities/function.objects/negators/unary_negate.depr_in_cxx17.fail.cpp
@@ -15,9 +15,6 @@
 // UNSUPPORTED: c++98, c++03, c++11, c++14
 // REQUIRES: verify-support
 
-// MODULES_DEFINES: _LIBCPP_ENABLE_DEPRECATION_WARNINGS
-#define _LIBCPP_ENABLE_DEPRECATION_WARNINGS
-
 #include <functional>
 
 #include "test_macros.h"
Index: libcxx/test/std/utilities/function.objects/negators/unary_negate.pass.cpp
===================================================================
--- libcxx/test/std/utilities/function.objects/negators/unary_negate.pass.cpp
+++ libcxx/test/std/utilities/function.objects/negators/unary_negate.pass.cpp
@@ -10,6 +10,8 @@
 
 // unary_negate
 
+#define _LIBCPP_DISABLE_DEPRECATION_WARNINGS
+
 #include <functional>
 #include <type_traits>
 #include <cassert>