diff --git a/clang/include/clang/Frontend/FrontendOptions.h b/clang/include/clang/Frontend/FrontendOptions.h
--- a/clang/include/clang/Frontend/FrontendOptions.h
+++ b/clang/include/clang/Frontend/FrontendOptions.h
@@ -303,6 +303,9 @@
   /// When using -emit-module, treat the modulemap as a system module.
   unsigned IsSystemModule : 1;
 
+  /// Wheather using -mthread-model single.
+  unsigned IsSingleThreadModel : 1;
+
   CodeCompleteOptions CodeCompleteOpts;
 
   /// Specifies the output format of the AST.
diff --git a/clang/lib/Frontend/CompilerInvocation.cpp b/clang/lib/Frontend/CompilerInvocation.cpp
--- a/clang/lib/Frontend/CompilerInvocation.cpp
+++ b/clang/lib/Frontend/CompilerInvocation.cpp
@@ -2027,6 +2027,8 @@
   Opts.IncludeTimestamps = !Args.hasArg(OPT_fno_pch_timestamp);
   Opts.UseTemporary = !Args.hasArg(OPT_fno_temp_file);
   Opts.IsSystemModule = Args.hasArg(OPT_fsystem_module);
+  Opts.IsSingleThreadModel =
+      Args.getLastArgValue(OPT_mthread_model, "") == "single";
 
   if (Opts.ProgramAction != frontend::GenerateModule && Opts.IsSystemModule)
     Diags.Report(diag::err_drv_argument_only_allowed_with) << "-fsystem-module"
diff --git a/clang/lib/Frontend/InitPreprocessor.cpp b/clang/lib/Frontend/InitPreprocessor.cpp
--- a/clang/lib/Frontend/InitPreprocessor.cpp
+++ b/clang/lib/Frontend/InitPreprocessor.cpp
@@ -403,6 +403,12 @@
     Builder.defineMacro("__STDCPP_DEFAULT_NEW_ALIGNMENT__",
                         Twine(TI.getNewAlign() / TI.getCharWidth()) +
                             TI.getTypeConstantSuffix(TI.getSizeType()));
+
+    //   -- __STDCPP_­THREADS__
+    //      Defined, and has the value integer literal 1, if and only if a
+    //      program can have more than one thread of execution.
+    if (!FEOpts.IsSingleThreadModel)
+      Builder.defineMacro("__STDCPP_THREADS__", "1");
   }
 
   // In C11 these are environment macros. In C++11 they are only defined
diff --git a/clang/test/CXX/cpp/cpp.predefined/p2.cpp b/clang/test/CXX/cpp/cpp.predefined/p2.cpp
new file mode 100644
--- /dev/null
+++ b/clang/test/CXX/cpp/cpp.predefined/p2.cpp
@@ -0,0 +1,6 @@
+// RUN: %clang_cc1 %s -verify
+// expected-no-diagnostics
+
+#ifndef __STDCPP_THREADS__
+#error __STDCPP_THREADS__ is not defined
+#endif
diff --git a/clang/test/Preprocessor/init-aarch64.c b/clang/test/Preprocessor/init-aarch64.c
--- a/clang/test/Preprocessor/init-aarch64.c
+++ b/clang/test/Preprocessor/init-aarch64.c
@@ -233,6 +233,7 @@
 // AARCH64-NEXT: #define __SIZE_TYPE__ long unsigned int
 // AARCH64-NEXT: #define __SIZE_WIDTH__ 64
 // AARCH64_CXX: #define __STDCPP_DEFAULT_NEW_ALIGNMENT__ 16UL
+// AARCH64_CXX: #define __STDCPP_THREADS__ 1
 // AARCH64-NEXT: #define __STDC_HOSTED__ 1
 // AARCH64-NEXT: #define __STDC_UTF_16__ 1
 // AARCH64-NEXT: #define __STDC_UTF_32__ 1