[Clang][Cygwin] Enable few conditions that are shared with MinGW

Author: mati865

clang/lib/AST/RecordLayoutBuilder.cpp

@@ -1946,7 +1946,7 @@ void ItaniumRecordLayoutBuilder::LayoutField(const FieldDecl *D,
           // silently there. For other targets that have ms_struct enabled
           // (most probably via a pragma or attribute), trigger a diagnostic
           // that defaults to an error.
-          if (!Context.getTargetInfo().getTriple().isWindowsGNUEnvironment())
+          if (!Context.getTargetInfo().getTriple().isOSCygMing())
             Diag(D->getLocation(), diag::warn_npot_ms_struct);
         }
         if (TypeSize > FieldAlign &&

clang/lib/CodeGen/Targets/X86.cpp

@@ -1374,7 +1374,7 @@ class WinX86_64ABIInfo : public ABIInfo {
 public:
   WinX86_64ABIInfo(CodeGen::CodeGenTypes &CGT, X86AVXABILevel AVXLevel)
       : ABIInfo(CGT), AVXLevel(AVXLevel),
-        IsMingw64(getTarget().getTriple().isWindowsGNUEnvironment()) {}
+        IsMingw64(getTarget().getTriple().isOSCygMing()) {}
 
   void computeInfo(CGFunctionInfo &FI) const override;
 

clang/lib/Driver/ToolChain.cpp

@@ -749,7 +749,7 @@ std::string ToolChain::buildCompilerRTBasename(const llvm::opt::ArgList &Args,
     break;
   case ToolChain::FT_Shared:
     Suffix = TT.isOSWindows()
-                 ? (TT.isWindowsGNUEnvironment() ? ".dll.a" : ".lib")
+                 ? (TT.isOSCygMing() ? ".dll.a" : ".lib")
                  : ".so";
     break;
   }

clang/lib/Sema/SemaDecl.cpp

@@ -12516,7 +12516,7 @@ static bool isDefaultStdCall(FunctionDecl *FD, Sema &S) {
 
   // Default calling convention for MinGW is __cdecl
   const llvm::Triple &T = S.Context.getTargetInfo().getTriple();
-  if (T.isWindowsGNUEnvironment())
+  if (T.isOSCygMing())
     return false;
 
   // Default calling convention for WinMain, wWinMain and DllMain