[Clang][M68k] Use `DefineStd` for target-specific macros

[myhsu]

Summary

(From the comments of D149867)
Use DefineStd for target-specific macros such that GNU-style definitions can be correctly toggled.

clang/lib/Basic/Targets/M68k.cpp

 }
 
 void M68kTargetInfo::getTargetDefines(const LangOptions &Opts,
                                       MacroBuilder &Builder) const {
   using llvm::Twine;
 
   Builder.defineMacro("__m68k__");
 
-  Builder.defineMacro("mc68000");
-  Builder.defineMacro("__mc68000");
-  Builder.defineMacro("__mc68000__");
+  DefineStd(Builder, "mc68000", Opts);
 
   // For sub-architecture
   switch (CPU) {
   case CK_68010:
-    Builder.defineMacro("mc68010");
-    Builder.defineMacro("__mc68010");
-    Builder.defineMacro("__mc68010__");
+    DefineStd(Builder, "mc68010", Opts);
     break;
   case CK_68020:
-    Builder.defineMacro("mc68020");
-    Builder.defineMacro("__mc68020");
-    Builder.defineMacro("__mc68020__");
+    DefineStd(Builder, "mc68020", Opts);
     break;
   case CK_68030:
-    Builder.defineMacro("mc68030");
-    Builder.defineMacro("__mc68030");
-    Builder.defineMacro("__mc68030__");
+    DefineStd(Builder, "mc68030", Opts);
     break;
   case CK_68040:
-    Builder.defineMacro("mc68040");
-    Builder.defineMacro("__mc68040");
-    Builder.defineMacro("__mc68040__");
+    DefineStd(Builder, "mc68040", Opts);
     break;
   case CK_68060:
-    Builder.defineMacro("mc68060");
-    Builder.defineMacro("__mc68060");
-    Builder.defineMacro("__mc68060__");
+    DefineStd(Builder, "mc68060", Opts);
     break;
   default:
     break;
   }
 
   if (CPU >= CK_68020) {
     Builder.defineMacro("__GCC_HAVE_SYNC_COMPARE_AND_SWAP_1");
     Builder.defineMacro("__GCC_HAVE_SYNC_COMPARE_AND_SWAP_2");

clang/test/Driver/m68k-macros.cpp

 // Check macro definitions
 
 // Since '__HAVE_68881__' sorted before most of the 'mc680x0' macros, we need to put it here.
 // CHECK-MX881: #define __HAVE_68881__ 1
 // CHECK-NOMX881-NOT: #define __HAVE_68881__ 1
 
-// RUN: %clang -target m68k-unknown-linux -m68000 -dM -E %s | FileCheck --check-prefixes=CHECK-MX,CHECK-NOMX881 %s
+// RUN: %clang -target m68k-unknown-linux -m68000 -std=c++11 -dM -E %s | FileCheck --check-prefixes=CHECK-MX,CHECK-NOMX881 %s
+// RUN: %clang -target m68k-unknown-linux -m68000 -std=gnu++11 -dM -E %s | FileCheck --check-prefixes=CHECK-MX,CHECK-MX-GNU,CHECK-NOMX881 %s
 // RUN: %clang -target m68k-unknown-linux -m68000 -mhard-float -dM -E %s | FileCheck --check-prefix=CHECK-MX881 %s
 // RUN: %clang -target m68k-unknown-linux -m68000 -m68881 -dM -E %s | FileCheck --check-prefix=CHECK-MX881 %s
 // CHECK-MX: #define __mc68000 1
 // CHECK-MX: #define __mc68000__ 1
-// CHECK-MX: #define mc68000 1
+// CHECK-MX-GNU: #define mc68000 1
 
-// RUN: %clang -target m68k-unknown-linux -m68010 -dM -E %s | FileCheck --check-prefixes=CHECK-MX10,CHECK-NOMX881 %s
+// RUN: %clang -target m68k-unknown-linux -m68010 -std=c++11 -dM -E %s | FileCheck --check-prefixes=CHECK-MX10,CHECK-NOMX881 %s
+// RUN: %clang -target m68k-unknown-linux -m68010 -std=gnu++11 -dM -E %s | FileCheck --check-prefixes=CHECK-MX10,CHECK-MX10-GNU,CHECK-NOMX881 %s
 // RUN: %clang -target m68k-unknown-linux -m68010 -mhard-float -dM -E %s | FileCheck --check-prefix=CHECK-MX881 %s
 // RUN: %clang -target m68k-unknown-linux -m68010 -m68881 -dM -E %s | FileCheck --check-prefix=CHECK-MX881 %s
 // CHECK-MX10: #define __mc68000 1
 // CHECK-MX10: #define __mc68000__ 1
 // CHECK-MX10: #define __mc68010 1
 // CHECK-MX10: #define __mc68010__ 1
-// CHECK-MX10: #define mc68000 1
-// CHECK-MX10: #define mc68010 1
+// CHECK-MX10-GNU: #define mc68000 1
+// CHECK-MX10-GNU: #define mc68010 1
 
-// RUN: %clang -target m68k-unknown-linux -m68020 -dM -E %s | FileCheck --check-prefixes=CHECK-MX20,CHECK-MX881 %s
+// RUN: %clang -target m68k-unknown-linux -m68020 -std=c++11 -dM -E %s | FileCheck --check-prefixes=CHECK-MX20,CHECK-MX881 %s
+// RUN: %clang -target m68k-unknown-linux -m68020 -std=gnu++11 -dM -E %s | FileCheck --check-prefixes=CHECK-MX20,CHECK-MX20-GNU,CHECK-MX881 %s
 // RUN: %clang -target m68k-unknown-linux -m68020 -msoft-float -dM -E %s | FileCheck --check-prefix=CHECK-NOMX881 %s
 // CHECK-MX20: #define __mc68000 1
 // CHECK-MX20: #define __mc68000__ 1
 // CHECK-MX20: #define __mc68020 1
 // CHECK-MX20: #define __mc68020__ 1
-// CHECK-MX20: #define mc68000 1
-// CHECK-MX20: #define mc68020 1
+// CHECK-MX20-GNU: #define mc68000 1
+// CHECK-MX20-GNU: #define mc68020 1
 
-// RUN: %clang -target m68k-unknown-linux -m68030 -dM -E %s | FileCheck --check-prefixes=CHECK-MX30,CHECK-MX881 %s
+// RUN: %clang -target m68k-unknown-linux -m68030 -std=c++11 -dM -E %s | FileCheck --check-prefixes=CHECK-MX30,CHECK-MX881 %s
+// RUN: %clang -target m68k-unknown-linux -m68030 -std=gnu++11 -dM -E %s | FileCheck --check-prefixes=CHECK-MX30,CHECK-MX30-GNU,CHECK-MX881 %s
 // RUN: %clang -target m68k-unknown-linux -m68030 -msoft-float -dM -E %s | FileCheck --check-prefix=CHECK-NOMX881 %s
 // CHECK-MX30: #define __mc68000 1
 // CHECK-MX30: #define __mc68000__ 1
 // CHECK-MX30: #define __mc68030 1
 // CHECK-MX30: #define __mc68030__ 1
-// CHECK-MX30: #define mc68000 1
-// CHECK-MX30: #define mc68030 1
+// CHECK-MX30-GNU: #define mc68000 1
+// CHECK-MX30-GNU: #define mc68030 1
 
-// RUN: %clang -target m68k-unknown-linux -m68040 -dM -E %s | FileCheck --check-prefixes=CHECK-MX40,CHECK-MX881 %s
+// RUN: %clang -target m68k-unknown-linux -m68040 -std=c++11 -dM -E %s | FileCheck --check-prefixes=CHECK-MX40,CHECK-MX881 %s
+// RUN: %clang -target m68k-unknown-linux -m68040 -std=gnu++11 -dM -E %s | FileCheck --check-prefixes=CHECK-MX40,CHECK-MX40-GNU,CHECK-MX881 %s
 // RUN: %clang -target m68k-unknown-linux -m68040 -msoft-float -dM -E %s | FileCheck --check-prefix=CHECK-NOMX881 %s
 // CHECK-MX40: #define __mc68000 1
 // CHECK-MX40: #define __mc68000__ 1
 // CHECK-MX40: #define __mc68040 1
 // CHECK-MX40: #define __mc68040__ 1
-// CHECK-MX40: #define mc68000 1
-// CHECK-MX40: #define mc68040 1
+// CHECK-MX40-GNU: #define mc68000 1
+// CHECK-MX40-GNU: #define mc68040 1
 
-// RUN: %clang -target m68k-unknown-linux -m68060 -dM -E %s | FileCheck --check-prefixes=CHECK-MX60,CHECK-MX881 %s
+// RUN: %clang -target m68k-unknown-linux -m68060 -std=c++11 -dM -E %s | FileCheck --check-prefixes=CHECK-MX60,CHECK-MX881 %s
+// RUN: %clang -target m68k-unknown-linux -m68060 -std=gnu++11 -dM -E %s | FileCheck --check-prefixes=CHECK-MX60,CHECK-MX60-GNU,CHECK-MX881 %s
 // RUN: %clang -target m68k-unknown-linux -m68060 -msoft-float -dM -E %s | FileCheck --check-prefix=CHECK-NOMX881 %s
 // CHECK-MX60: #define __mc68000 1
 // CHECK-MX60: #define __mc68000__ 1
 // CHECK-MX60: #define __mc68060 1
 // CHECK-MX60: #define __mc68060__ 1
-// CHECK-MX60: #define mc68000 1
-// CHECK-MX60: #define mc68060 1
+// CHECK-MX60-GNU: #define mc68000 1
+// CHECK-MX60-GNU: #define mc68060 1