diff --git a/clang/lib/Basic/TargetInfo.cpp b/clang/lib/Basic/TargetInfo.cpp
--- a/clang/lib/Basic/TargetInfo.cpp
+++ b/clang/lib/Basic/TargetInfo.cpp
@@ -406,7 +406,7 @@
     // for OpenCL C 2.0 but with no access to target capabilities. Target
     // should be immutable once created and thus these language options need
     // to be defined only once.
-    if (Opts.OpenCLVersion == 300) {
+    if (Opts.OpenCLVersion == 300 || Opts.OpenCLCPlusPlusVersion == 202100) {
       const auto &OpenCLFeaturesMap = getSupportedOpenCLOpts();
       Opts.OpenCLGenericAddressSpace = hasFeatureEnabled(
           OpenCLFeaturesMap, "__opencl_c_generic_address_space");
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
@@ -3176,7 +3176,7 @@
     Opts.OpenCLCPlusPlus = Opts.CPlusPlus;
     Opts.OpenCLPipes = Opts.OpenCLCPlusPlus || Opts.OpenCLVersion == 200;
     Opts.OpenCLGenericAddressSpace =
-        Opts.OpenCLCPlusPlus || Opts.OpenCLVersion == 200;
+        Opts.OpenCLCPlusPlusVersion == 100 || Opts.OpenCLVersion == 200;
 
     // Include default header file for OpenCL.
     if (Opts.IncludeDefaultHeader) {
diff --git a/clang/lib/Headers/opencl-c-base.h b/clang/lib/Headers/opencl-c-base.h
--- a/clang/lib/Headers/opencl-c-base.h
+++ b/clang/lib/Headers/opencl-c-base.h
@@ -31,8 +31,11 @@
 
 // Define feature macros for OpenCL C 2.0
 #if (defined(__OPENCL_CPP_VERSION__) || __OPENCL_C_VERSION__ == 200)
-#define __opencl_c_pipes 1
+#if (__OPENCL_CPP_VERSION__ != 202100)
 #define __opencl_c_generic_address_space 1
+#endif
+
+#define __opencl_c_pipes 1
 #define __opencl_c_work_group_collective_functions 1
 #define __opencl_c_atomic_order_acq_rel 1
 #define __opencl_c_atomic_order_seq_cst 1
@@ -42,7 +45,7 @@
 #define __opencl_c_read_write_images 1
 #define __opencl_c_program_scope_global_variables 1
 #define __opencl_c_images 1
-#endif
+#endif // (defined(__OPENCL_CPP_VERSION__) || __OPENCL_C_VERSION__ == 200)
 
 // Define header-only feature macros for OpenCL C 3.0.
 #if (__OPENCL_C_VERSION__ == 300)
diff --git a/clang/test/CodeGenOpenCL/overload.cl b/clang/test/CodeGenOpenCL/overload.cl
--- a/clang/test/CodeGenOpenCL/overload.cl
+++ b/clang/test/CodeGenOpenCL/overload.cl
@@ -1,5 +1,7 @@
 // RUN: %clang_cc1 -cl-std=CL2.0 -emit-llvm -o - -triple spir-unknown-unknown %s | FileCheck %s
+// RUN: %clang_cc1 -cl-std=clc++1.0 -emit-llvm -o - -triple spir-unknown-unknown %s | FileCheck %s
 // RUN: %clang_cc1 -cl-std=CL3.0 -cl-ext=+__opencl_c_generic_address_space -emit-llvm -o - -triple spir-unknown-unknown %s | FileCheck %s
+// RUN: %clang_cc1 -cl-std=clc++2021 -cl-ext=+__opencl_c_generic_address_space -emit-llvm -o - -triple spir-unknown-unknown %s | FileCheck %s
 
 typedef short short4 __attribute__((ext_vector_type(4)));
 
diff --git a/clang/test/Headers/opencl-c-header.cl b/clang/test/Headers/opencl-c-header.cl
--- a/clang/test/Headers/opencl-c-header.cl
+++ b/clang/test/Headers/opencl-c-header.cl
@@ -1,8 +1,9 @@
 // RUN: %clang_cc1 -O0 -triple spir-unknown-unknown -internal-isystem ../../lib/Headers -include opencl-c.h -emit-llvm -o - %s -verify | FileCheck %s
 // RUN: %clang_cc1 -O0 -triple spir-unknown-unknown -internal-isystem ../../lib/Headers -include opencl-c.h -emit-llvm -o - %s -verify -cl-std=CL1.1 | FileCheck %s
 // RUN: %clang_cc1 -O0 -triple spir-unknown-unknown -internal-isystem ../../lib/Headers -include opencl-c.h -emit-llvm -o - %s -verify -cl-std=CL1.2 | FileCheck %s
-// RUN: %clang_cc1 -O0 -triple spir-unknown-unknown -internal-isystem ../../lib/Headers -include opencl-c.h -emit-llvm -o - %s -verify -cl-std=clc++ | FileCheck %s --check-prefix=CHECK20
+// RUN: %clang_cc1 -O0 -triple spir-unknown-unknown -internal-isystem ../../lib/Headers -include opencl-c.h -emit-llvm -o - %s -verify -cl-std=clc++1.0 | FileCheck %s --check-prefix=CHECK20
 // RUN: %clang_cc1 -O0 -triple spir-unknown-unknown -internal-isystem ../../lib/Headers -include opencl-c.h -emit-llvm -o - %s -verify -cl-std=CL3.0 | FileCheck %s
+// RUN: %clang_cc1 -O0 -triple spir-unknown-unknown -internal-isystem ../../lib/Headers -include opencl-c.h -emit-llvm -o - %s -verify -cl-std=clc++2021 | FileCheck %s
 
 // Test including the default header as a module.
 // The module should be compiled only once and loaded from cache afterwards.
@@ -57,7 +58,7 @@
 // CHECK20: _Z16convert_char_rtec
 char f(char x) {
 // Check functionality from OpenCL 2.0 onwards
-#if defined(__OPENCL_CPP_VERSION__) || (__OPENCL_C_VERSION__ == CL_VERSION_2_0)
+#if (__OPENCL_CPP_VERSION__ == 100) || (__OPENCL_C_VERSION__ == CL_VERSION_2_0)
   ndrange_t t;
   x = ctz(x);
 #endif //__OPENCL_C_VERSION__
@@ -183,12 +184,15 @@
 
 #elif (defined(__OPENCL_CPP_VERSION__) || __OPENCL_C_VERSION__ == 200)
 
-#ifndef  __opencl_c_pipes
-#error "Feature macro __opencl_c_pipes should be defined"
-#endif
+#if (__OPENCL_CPP_VERSION__ != 202100)
 #ifndef __opencl_c_generic_address_space
 #error "Feature macro __opencl_c_generic_address_space should be defined"
 #endif
+#endif
+
+#ifndef __opencl_c_pipes
+#error "Feature macro __opencl_c_pipes should be defined"
+#endif
 #ifndef __opencl_c_work_group_collective_functions
 #error "Feature macro __opencl_c_work_group_collective_functions should be defined"
 #endif
diff --git a/clang/test/SemaOpenCL/address-spaces-conversions-cl2.0.cl b/clang/test/SemaOpenCL/address-spaces-conversions-cl2.0.cl
--- a/clang/test/SemaOpenCL/address-spaces-conversions-cl2.0.cl
+++ b/clang/test/SemaOpenCL/address-spaces-conversions-cl2.0.cl
@@ -1,12 +1,15 @@
 // RUN: %clang_cc1 %s -ffake-address-space-map -verify -pedantic -fsyntax-only -DCONSTANT -cl-std=CL2.0
 // RUN: %clang_cc1 %s -ffake-address-space-map -verify -pedantic -fsyntax-only -DGLOBAL -cl-std=CL2.0
 // RUN: %clang_cc1 %s -ffake-address-space-map -verify -pedantic -fsyntax-only -DGENERIC -cl-std=CL2.0
-// RUN: %clang_cc1 %s -ffake-address-space-map -verify -pedantic -fsyntax-only -DCONSTANT -cl-std=clc++
-// RUN: %clang_cc1 %s -ffake-address-space-map -verify -pedantic -fsyntax-only -DGLOBAL -cl-std=clc++
-// RUN: %clang_cc1 %s -ffake-address-space-map -verify -pedantic -fsyntax-only -DGENERIC -cl-std=clc++
+// RUN: %clang_cc1 %s -ffake-address-space-map -verify -pedantic -fsyntax-only -DCONSTANT -cl-std=clc++1.0
+// RUN: %clang_cc1 %s -ffake-address-space-map -verify -pedantic -fsyntax-only -DGLOBAL -cl-std=clc++1.0
+// RUN: %clang_cc1 %s -ffake-address-space-map -verify -pedantic -fsyntax-only -DGENERIC -cl-std=clc++1.0
 // RUN: %clang_cc1 %s -ffake-address-space-map -verify -pedantic -fsyntax-only -DCONSTANT -cl-std=CL3.0 -cl-ext=+__opencl_c_generic_address_space
 // RUN: %clang_cc1 %s -ffake-address-space-map -verify -pedantic -fsyntax-only -DGLOBAL -cl-std=CL3.0 -cl-ext=+__opencl_c_generic_address_space
 // RUN: %clang_cc1 %s -ffake-address-space-map -verify -pedantic -fsyntax-only -DGENERIC -cl-std=CL3.0 -cl-ext=+__opencl_c_generic_address_space
+// RUN: %clang_cc1 %s -ffake-address-space-map -verify -pedantic -fsyntax-only -DCONSTANT -cl-std=clc++2021 -cl-ext=+__opencl_c_generic_address_space
+// RUN: %clang_cc1 %s -ffake-address-space-map -verify -pedantic -fsyntax-only -DGLOBAL -cl-std=clc++2021 -cl-ext=+__opencl_c_generic_address_space
+// RUN: %clang_cc1 %s -ffake-address-space-map -verify -pedantic -fsyntax-only -DGENERIC -cl-std=clc++2021 -cl-ext=+__opencl_c_generic_address_space
 
 /* OpenCLC v2.0 adds a set of restrictions for conversions between pointers to
 *  different address spaces, mainly described in Sections 6.5.5 and 6.5.6.
diff --git a/clang/test/SemaOpenCL/address-spaces.cl b/clang/test/SemaOpenCL/address-spaces.cl
--- a/clang/test/SemaOpenCL/address-spaces.cl
+++ b/clang/test/SemaOpenCL/address-spaces.cl
@@ -1,7 +1,8 @@
 // RUN: %clang_cc1 %s -verify -pedantic -fsyntax-only
 // RUN: %clang_cc1 %s -cl-std=CL2.0 -verify -pedantic -fsyntax-only
 // RUN: %clang_cc1 %s -cl-std=CL3.0 -cl-ext=+__opencl_c_generic_address_space -verify -pedantic -fsyntax-only
-// RUN: %clang_cc1 %s -cl-std=clc++ -verify -pedantic -fsyntax-only
+// RUN: %clang_cc1 %s -cl-std=clc++1.0 -verify -pedantic -fsyntax-only
+// RUN: %clang_cc1 %s -cl-std=clc++2021 -cl-ext=+__opencl_c_generic_address_space -verify -pedantic -fsyntax-only
 
 __constant int ci = 1;
 
diff --git a/clang/test/SemaOpenCL/extension-version.cl b/clang/test/SemaOpenCL/extension-version.cl
--- a/clang/test/SemaOpenCL/extension-version.cl
+++ b/clang/test/SemaOpenCL/extension-version.cl
@@ -2,14 +2,16 @@
 // RUN: %clang_cc1 -x cl -cl-std=CL1.1 %s -verify -triple spir-unknown-unknown
 // RUN: %clang_cc1 -x cl -cl-std=CL1.2 %s -verify -triple spir-unknown-unknown
 // RUN: %clang_cc1 -x cl -cl-std=CL2.0 %s -verify -triple spir-unknown-unknown
-// RUN: %clang_cc1 -x cl -cl-std=clc++ %s -verify -triple spir-unknown-unknown
+// RUN: %clang_cc1 -x cl -cl-std=clc++1.0 %s -verify -triple spir-unknown-unknown
 // RUN: %clang_cc1 -x cl -cl-std=CL3.0 %s -verify -triple spir-unknown-unknown
+// RUN: %clang_cc1 -x cl -cl-std=clc++2021 %s -verify -triple spir-unknown-unknown
 // RUN: %clang_cc1 -x cl -cl-std=CL %s -verify -triple spir-unknown-unknown -Wpedantic-core-features -DTEST_CORE_FEATURES
 // RUN: %clang_cc1 -x cl -cl-std=CL1.1 %s -verify -triple spir-unknown-unknown -Wpedantic-core-features -DTEST_CORE_FEATURES
 // RUN: %clang_cc1 -x cl -cl-std=CL1.2 %s -verify -triple spir-unknown-unknown -Wpedantic-core-features -DTEST_CORE_FEATURES
 // RUN: %clang_cc1 -x cl -cl-std=CL2.0 %s -verify -triple spir-unknown-unknown -Wpedantic-core-features -DTEST_CORE_FEATURES
-// RUN: %clang_cc1 -x cl -cl-std=clc++ %s -verify -triple spir-unknown-unknown -Wpedantic-core-features -DTEST_CORE_FEATURES
+// RUN: %clang_cc1 -x cl -cl-std=clc++1.0 %s -verify -triple spir-unknown-unknown -Wpedantic-core-features -DTEST_CORE_FEATURES
 // RUN: %clang_cc1 -x cl -cl-std=CL3.0 %s -verify -triple spir-unknown-unknown -Wpedantic-core-features -DTEST_CORE_FEATURES
+// RUN: %clang_cc1 -x cl -cl-std=clc++2021 %s -verify -triple spir-unknown-unknown -Wpedantic-core-features -DTEST_CORE_FEATURES
 
 // Extensions in all versions
 #ifndef cl_clang_storage_class_specifiers