Index: include/clang/Basic/DiagnosticParseKinds.td
===================================================================
--- include/clang/Basic/DiagnosticParseKinds.td
+++ include/clang/Basic/DiagnosticParseKinds.td
@@ -929,7 +929,7 @@
 def warn_pragma_unsupported_extension : Warning<
   "unsupported OpenCL extension %0 - ignoring">, InGroup<IgnoredPragmas>;
 def warn_pragma_extension_is_core : Warning<
-  "OpenCL extension %0 is core feature or supported optional core feature - ignoring">, InGroup<IgnoredPragmas>;
+  "OpenCL extension %0 is core feature or supported optional core feature - ignoring">, InGroup<DiagGroup<"pedantic-core-features">>, DefaultIgnore;
 
 // OpenCL errors.
 def err_opencl_taking_function_address_parser : Error<
Index: test/Parser/opencl-atomics-cl20.cl
===================================================================
--- test/Parser/opencl-atomics-cl20.cl
+++ test/Parser/opencl-atomics-cl20.cl
@@ -1,6 +1,6 @@
 // RUN: %clang_cc1 %s -triple spir-unknown-unknown -verify -pedantic -fsyntax-only
 // RUN: %clang_cc1 %s -triple spir-unknown-unknown -verify -fsyntax-only -cl-std=CL2.0 -DCL20
-// RUN: %clang_cc1 %s -triple spir-unknown-unknown -verify -fsyntax-only -cl-std=CL2.0 -DCL20 -DEXT
+// RUN: %clang_cc1 %s -triple spir-unknown-unknown -verify -fsyntax-only -cl-std=CL2.0 -DCL20 -DEXT -Wpedantic-core-features
 
 #ifdef EXT
 #pragma OPENCL EXTENSION cl_khr_int64_base_atomics:enable
Index: test/SemaOpenCL/extension-version.cl
===================================================================
--- test/SemaOpenCL/extension-version.cl
+++ test/SemaOpenCL/extension-version.cl
@@ -2,8 +2,12 @@
 // 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=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
 
-#if __OPENCL_C_VERSION__ >= 200
+#if __OPENCL_C_VERSION__ >= 200 && ! defined TEST_CORE_FEATURES
 // expected-no-diagnostics
 #endif
 
@@ -38,57 +42,76 @@
 #endif
 #pragma OPENCL EXTENSION cl_khr_icd: enable
 
-// COre features in CL 1.1
-#if (__OPENCL_C_VERSION__ < 110)
+// Core features in CL 1.1
 #ifndef cl_khr_byte_addressable_store
 #error "Missing cl_khr_byte_addressable_store define"
 #endif
 #pragma OPENCL EXTENSION cl_khr_byte_addressable_store: enable
+#if (__OPENCL_C_VERSION__ >= 110) && defined TEST_CORE_FEATURES
+// expected-warning@-2{{OpenCL extension 'cl_khr_byte_addressable_store' is core feature or supported optional core feature - ignoring}}
+#endif
 
 #ifndef cl_khr_global_int32_base_atomics
 #error "Missing cl_khr_global_int32_base_atomics define"
 #endif
 #pragma OPENCL EXTENSION cl_khr_global_int32_base_atomics: enable
+#if (__OPENCL_C_VERSION__ >= 110) && defined TEST_CORE_FEATURES
+// expected-warning@-2{{OpenCL extension 'cl_khr_global_int32_base_atomics' is core feature or supported optional core feature - ignoring}}
+#endif
 
 #ifndef cl_khr_global_int32_extended_atomics
 #error "Missing cl_khr_global_int32_extended_atomics define"
 #endif
 #pragma OPENCL EXTENSION cl_khr_global_int32_extended_atomics: enable
+#if (__OPENCL_C_VERSION__ >= 110) && defined TEST_CORE_FEATURES
+// expected-warning@-2{{OpenCL extension 'cl_khr_global_int32_extended_atomics' is core feature or supported optional core feature - ignoring}}
+#endif
 
 #ifndef cl_khr_local_int32_base_atomics
 #error "Missing cl_khr_local_int32_base_atomics define"
 #endif
 #pragma OPENCL EXTENSION cl_khr_local_int32_base_atomics: enable
+#if (__OPENCL_C_VERSION__ >= 110) && defined TEST_CORE_FEATURES
+// expected-warning@-2{{OpenCL extension 'cl_khr_local_int32_base_atomics' is core feature or supported optional core feature - ignoring}}
+#endif
 
 #ifndef cl_khr_local_int32_extended_atomics
 #error "Missing cl_khr_local_int32_extended_atomics define"
 #endif
 #pragma OPENCL EXTENSION cl_khr_local_int32_extended_atomics: enable
+#if (__OPENCL_C_VERSION__ >= 110) && defined TEST_CORE_FEATURES
+// expected-warning@-2{{OpenCL extension 'cl_khr_local_int32_extended_atomics' is core feature or supported optional core feature - ignoring}}
+#endif
 
+#if (__OPENCL_C_VERSION__ < 110)
+// Deprecated abvoe 1.0
 #ifndef cl_khr_select_fprounding_mode
 #error "Missing cl_khr_select_fp_rounding_mode define"
 #endif
 #pragma OPENCL EXTENSION cl_khr_select_fprounding_mode: enable
-
 #endif
 
+
 // Core feature in CL 1.2
-#if (__OPENCL_C_VERSION__ < 120)
 #ifndef cl_khr_fp64
 #error "Missing cl_khr_fp64 define"
 #endif
 #pragma OPENCL EXTENSION cl_khr_fp64: enable
+#if (__OPENCL_C_VERSION__ >= 120) && defined TEST_CORE_FEATURES
+// expected-warning@-2{{OpenCL extension 'cl_khr_fp64' is core feature or supported optional core feature - ignoring}}
 #endif
 
 //Core feature in CL 2.0
-#if (__OPENCL_C_VERSION__ < 200)
 #ifndef cl_khr_3d_image_writes
 #error "Missing cl_khr_3d_image_writes define"
 #endif
 #pragma OPENCL EXTENSION cl_khr_3d_image_writes: enable
+#if (__OPENCL_C_VERSION__ >= 200) && defined TEST_CORE_FEATURES
+// expected-warning@-2{{OpenCL extension 'cl_khr_3d_image_writes' is core feature or supported optional core feature - ignoring}}
 #endif
 
 
+
 #if (__OPENCL_C_VERSION__ >= 110)
 #ifndef cl_khr_gl_event
 #error "Missing cl_khr_gl_event define"
Index: test/SemaOpenCL/invalid-logical-ops-1.2.cl
===================================================================
--- test/SemaOpenCL/invalid-logical-ops-1.2.cl
+++ test/SemaOpenCL/invalid-logical-ops-1.2.cl
@@ -1,6 +1,6 @@
 // RUN: %clang_cc1 %s -verify -cl-std=CL1.2 -triple x86_64-unknown-linux-gnu
 
-#pragma OPENCL EXTENSION cl_khr_fp64 : enable // expected-warning{{OpenCL extension 'cl_khr_fp64' is core feature or supported optional core feature - ignoring}}
+#pragma OPENCL EXTENSION cl_khr_fp64 : enable
 
 typedef __attribute__((ext_vector_type(4))) float float4;
 typedef __attribute__((ext_vector_type(4))) double double4;