[OpenCL] Supports optional generic address space semantics in C++ for OpenCL 2021

Adds support for a feature macro `__opencl_c_generic_adress_space`
in C++ for OpenCL 2021 enabling a respective optional core feature
from OpenCL 3.0. Testing is only performed in SemaOpenCL because
generic address space functionality is yet to be implemented in
C++ for OpenCL 2021.

This change aims to achieve compatibility between C++ for OpenCL
2021 and OpenCL 3.0.

Differential Revision: https://reviews.llvm.org/D108461

Author: Topotuna

clang/lib/Basic/TargetInfo.cpp

@@ -406,12 +406,13 @@ void TargetInfo::adjust(DiagnosticsEngine &Diags, LangOptions &Opts) {
     // 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.getOpenCLCompatibleVersion() == 300) {
       const auto &OpenCLFeaturesMap = getSupportedOpenCLOpts();
       Opts.OpenCLGenericAddressSpace = hasFeatureEnabled(
           OpenCLFeaturesMap, "__opencl_c_generic_address_space");
-      Opts.OpenCLPipes =
-          hasFeatureEnabled(OpenCLFeaturesMap, "__opencl_c_pipes");
+      if (Opts.OpenCLVersion == 300)
+        Opts.OpenCLPipes =
+            hasFeatureEnabled(OpenCLFeaturesMap, "__opencl_c_pipes");
     }
   }
 

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.

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;