[AArch64] Produce correct defaultlib directives for windows in MSVC style

[rnk]

lgtm

lib/CodeGen/TargetInfo.cpp

   }
 
   int getDwarfEHStackPointer(CodeGen::CodeGenModule &M) const override {
     return 31;
   }
 
   bool doesReturnSlotInterfereWithArgs() const override { return false; }
 };
+
+class WindowsAArch64TargetCodeGenInfo : public AArch64TargetCodeGenInfo {
+public:
+  WindowsAArch64TargetCodeGenInfo(CodeGenTypes &CGT, AArch64ABIInfo::ABIKind K)
+      : AArch64TargetCodeGenInfo(CGT, K) {}
+
+  void getDependentLibraryOption(llvm::StringRef Lib,
+                                 llvm::SmallString<24> &Opt) const override {
+    Opt = "/DEFAULTLIB:" + qualifyWindowsLibrary(Lib);
+  }
+
+  void getDetectMismatchOption(llvm::StringRef Name, llvm::StringRef Value,
+                               llvm::SmallString<32> &Opt) const override {
+    Opt = "/FAILIFMISMATCH:\"" + Name.str() + "=" + Value.str() + "\"";
+  }
+};
 }
 
 ABIArgInfo AArch64ABIInfo::classifyArgumentType(QualType Ty) const {
   Ty = useFirstFieldIfTransparentUnion(Ty);
 
   // Handle illegal vector types here.
   if (isIllegalVectorType(Ty)) {
     uint64_t Size = getContext().getTypeSize(Ty);

     return SetCGInfo(new AVRTargetCodeGenInfo(Types));
 
   case llvm::Triple::aarch64:
   case llvm::Triple::aarch64_be: {
     AArch64ABIInfo::ABIKind Kind = AArch64ABIInfo::AAPCS;
     if (getTarget().getABI() == "darwinpcs")
       Kind = AArch64ABIInfo::DarwinPCS;
     else if (Triple.isOSWindows())
-      Kind = AArch64ABIInfo::Win64;
+      return SetCGInfo(
+          new WindowsAArch64TargetCodeGenInfo(Types, AArch64ABIInfo::Win64));
 
     return SetCGInfo(new AArch64TargetCodeGenInfo(Types, Kind));
   }
 
   case llvm::Triple::wasm32:
   case llvm::Triple::wasm64:
     return SetCGInfo(new WebAssemblyTargetCodeGenInfo(Types));
 

test/CodeGen/pragma-comment.c

 // RUN: %clang_cc1 %s -triple i686-pc-win32 -fms-extensions -emit-llvm -o - | FileCheck %s
 // RUN: %clang_cc1 %s -triple thumbv7-windows -fms-extensions -emit-llvm -o - | FileCheck %s
 // RUN: %clang_cc1 %s -triple x86_64-pc-win32 -fms-extensions -emit-llvm -o - | FileCheck %s
 // RUN: %clang_cc1 %s -triple thumbv7-linux-gnueabihf -fms-extensions -emit-llvm -o - | FileCheck -check-prefix LINUX %s
 // RUN: %clang_cc1 %s -triple i686-pc-linux -fms-extensions -emit-llvm -o - | FileCheck -check-prefix LINUX %s
 // RUN: %clang_cc1 %s -triple x86_64-scei-ps4 -fms-extensions -emit-llvm -o - | FileCheck -check-prefix PS4 %s
+// RUN: %clang_cc1 %s -triple aarch64-windows-msvc -fms-extensions -emit-llvm -o - | FileCheck %s
 
 #pragma comment(lib, "msvcrt.lib")
 #pragma comment(lib, "kernel32")
 #pragma comment(lib, "USER32.LIB")
 #pragma comment(lib, "with space")
 
 #define BAR "2"
 #pragma comment(linker," /bar=" BAR)