diff --git a/clang/docs/DataFlowSanitizer.rst b/clang/docs/DataFlowSanitizer.rst
--- a/clang/docs/DataFlowSanitizer.rst
+++ b/clang/docs/DataFlowSanitizer.rst
@@ -20,6 +20,26 @@
 dynamic data flow analysis framework to be used by clients to help
 detect application-specific issues within their own code.
 
+How to build
+============
+
+Build LLVM/Clang with `CMake <https://llvm.org/docs/CMake.html>`_.
+
+To build libc++ and the libc++ ABI with data flow sanitizer instrumentation:
+
+.. code-block:: console
+  cd libcxx-build
+
+  # An example using ninja
+  cmake -GNinja path/to/llvm-project/llvm \
+    -DCMAKE_C_COMPILER=clang \
+    -DCMAKE_CXX_COMPILER=clang++ \
+    -DLLVM_USE_SANITIZER="DataFlow" \
+    -DLLVM_ENABLE_LIBCXX=ON \
+    -DLLVM_ENABLE_PROJECTS="libcxx;libcxxabi"
+
+  ninja cxx cxxabi
+
 Usage
 =====
 
diff --git a/libcxx/CMakeLists.txt b/libcxx/CMakeLists.txt
--- a/libcxx/CMakeLists.txt
+++ b/libcxx/CMakeLists.txt
@@ -682,6 +682,8 @@
       append_flags(SANITIZER_FLAGS "-fsanitize=address,undefined -fno-sanitize=vptr,function -fno-sanitize-recover=all")
     elseif (USE_SANITIZER STREQUAL "Thread")
       append_flags(SANITIZER_FLAGS -fsanitize=thread)
+    elseif (USE_SANITIZER STREQUAL "DataFlow")
+      append_flags(SANITIZER_FLAGS -fsanitize=dataflow)
     else()
       message(WARNING "Unsupported value of LLVM_USE_SANITIZER: ${USE_SANITIZER}")
     endif()
diff --git a/llvm/cmake/modules/HandleLLVMOptions.cmake b/llvm/cmake/modules/HandleLLVMOptions.cmake
--- a/llvm/cmake/modules/HandleLLVMOptions.cmake
+++ b/llvm/cmake/modules/HandleLLVMOptions.cmake
@@ -728,6 +728,8 @@
     elseif (LLVM_USE_SANITIZER STREQUAL "Thread")
       append_common_sanitizer_flags()
       append("-fsanitize=thread" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
+    elseif (LLVM_USE_SANITIZER STREQUAL "DataFlow")
+      append("-fsanitize=dataflow" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
     elseif (LLVM_USE_SANITIZER STREQUAL "Address;Undefined" OR
             LLVM_USE_SANITIZER STREQUAL "Undefined;Address")
       append_common_sanitizer_flags()
diff --git a/llvm/docs/CMake.rst b/llvm/docs/CMake.rst
--- a/llvm/docs/CMake.rst
+++ b/llvm/docs/CMake.rst
@@ -422,7 +422,7 @@
 **LLVM_USE_SANITIZER**:STRING
   Define the sanitizer used to build LLVM binaries and tests. Possible values
   are ``Address``, ``Memory``, ``MemoryWithOrigins``, ``Undefined``, ``Thread``,
-  and ``Address;Undefined``. Defaults to empty string.
+  ``DataFlow``, and ``Address;Undefined``. Defaults to empty string.
 
 **LLVM_ENABLE_LTO**:STRING
   Add ``-flto`` or ``-flto=`` flags to the compile and link command