diff --git a/clang/lib/Driver/ToolChains/MSVC.h b/clang/lib/Driver/ToolChains/MSVC.h
index 48369e030aade..3950a8ed38e8b 100644
--- a/clang/lib/Driver/ToolChains/MSVC.h
+++ b/clang/lib/Driver/ToolChains/MSVC.h
@@ -61,9 +61,8 @@ class LLVM_LIBRARY_VISIBILITY MSVCToolChain : public ToolChain {
   /// formats, and to DWARF otherwise. Users can use -gcodeview and -gdwarf to
   /// override the default.
   llvm::codegenoptions::DebugInfoFormat getDefaultDebugFormat() const override {
-    return getTriple().isOSBinFormatMachO()
-               ? llvm::codegenoptions::DIF_DWARF
-               : llvm::codegenoptions::DIF_CodeView;
+    return getTriple().isOSBinFormatCOFF() ? llvm::codegenoptions::DIF_CodeView
+                                           : llvm::codegenoptions::DIF_DWARF;
   }
 
   /// Set the debugger tuning to "default", since we're definitely not tuning
diff --git a/clang/test/Driver/cl-options.c b/clang/test/Driver/cl-options.c
index 75f49deca0653..4aef79008451e 100644
--- a/clang/test/Driver/cl-options.c
+++ b/clang/test/Driver/cl-options.c
@@ -549,15 +549,15 @@
 // RTTI-NOT: "-fno-rtti-data"
 // RTTI-NOT: "-fno-rtti"
 
-// RUN: %clang_cl /Zi /c -### -- %s 2>&1 | FileCheck -check-prefix=Zi %s
+// RUN: %clang_cl -target x86_64-windows /Zi /c -### -- %s 2>&1 | FileCheck -check-prefix=Zi %s
 // Zi: "-gcodeview"
 // Zi: "-debug-info-kind=constructor"
 
-// RUN: %clang_cl /Z7 /c -### -- %s 2>&1 | FileCheck -check-prefix=Z7 %s
+// RUN: %clang_cl -target x86_64-windows /Z7 /c -### -- %s 2>&1 | FileCheck -check-prefix=Z7 %s
 // Z7: "-gcodeview"
 // Z7: "-debug-info-kind=constructor"
 
-// RUN: %clang_cl -gline-tables-only /c -### -- %s 2>&1 | FileCheck -check-prefix=ZGMLT %s
+// RUN: %clang_cl -target x86_64-windows -gline-tables-only /c -### -- %s 2>&1 | FileCheck -check-prefix=ZGMLT %s
 // ZGMLT: "-gcodeview"
 // ZGMLT: "-debug-info-kind=line-tables-only"
 
diff --git a/clang/test/Driver/cl-outputs.c b/clang/test/Driver/cl-outputs.c
index 4298657ac49f5..a8509e795c295 100644
--- a/clang/test/Driver/cl-outputs.c
+++ b/clang/test/Driver/cl-outputs.c
@@ -298,15 +298,15 @@
 // FioRACE2: "-E"
 // FioRACE2: "-o" "foo.x"
 
-// RUN: %clang_cl /Z7 /Foa.obj -### -- %s 2>&1 | FileCheck -check-prefix=ABSOLUTE_OBJPATH %s
+// RUN: %clang_cl -target x86_64-windows /Z7 /Foa.obj -### -- %s 2>&1 | FileCheck -check-prefix=ABSOLUTE_OBJPATH %s
 // ABSOLUTE_OBJPATH: "-object-file-name={{.*}}a.obj"
 
-// RUN: %clang_cl -fdebug-compilation-dir=. /Z7 /Foa.obj -### -- %s 2>&1 | FileCheck -check-prefix=RELATIVE_OBJPATH1 %s
+// RUN: %clang_cl -target x86_64-windows -fdebug-compilation-dir=. /Z7 /Foa.obj -### -- %s 2>&1 | FileCheck -check-prefix=RELATIVE_OBJPATH1 %s
 // RELATIVE_OBJPATH1: "-object-file-name=a.obj"
 
-// RUN: %clang_cl -fdebug-compilation-dir=. /Z7 /Fo:a.obj -### -- %s 2>&1 | FileCheck -check-prefix=RELATIVE_OBJPATH1_COLON %s
-// RUN: %clang_cl -fdebug-compilation-dir=. /Z7 /Fo: a.obj -### -- %s 2>&1 | FileCheck -check-prefix=RELATIVE_OBJPATH1_COLON %s
+// RUN: %clang_cl -target x86_64-windows -fdebug-compilation-dir=. /Z7 /Fo:a.obj -### -- %s 2>&1 | FileCheck -check-prefix=RELATIVE_OBJPATH1_COLON %s
+// RUN: %clang_cl -target x86_64-windows -fdebug-compilation-dir=. /Z7 /Fo: a.obj -### -- %s 2>&1 | FileCheck -check-prefix=RELATIVE_OBJPATH1_COLON %s
 // RELATIVE_OBJPATH1_COLON: "-object-file-name=a.obj"
 
-// RUN: %clang_cl -fdebug-compilation-dir=. /Z7 /Fofoo/a.obj -### -- %s 2>&1 | FileCheck -check-prefix=RELATIVE_OBJPATH2 %s
+// RUN: %clang_cl -target x86_64-windows -fdebug-compilation-dir=. /Z7 /Fofoo/a.obj -### -- %s 2>&1 | FileCheck -check-prefix=RELATIVE_OBJPATH2 %s
 // RELATIVE_OBJPATH2: "-object-file-name=foo\\a.obj"
diff --git a/clang/test/Driver/gcodeview-command-line.c b/clang/test/Driver/gcodeview-command-line.c
index da8708af32248..f8f6a88790672 100644
--- a/clang/test/Driver/gcodeview-command-line.c
+++ b/clang/test/Driver/gcodeview-command-line.c
@@ -5,15 +5,15 @@
 // OFF: "-gno-codeview-command-line"
 
 // default
-// RUN: %clang_cl /Z7 -### -- %s 2>&1 | FileCheck -check-prefix=ON %s
+// RUN: %clang_cl -target x86_64-windows /Z7 -### -- %s 2>&1 | FileCheck -check-prefix=ON %s
 // enabled
-// RUN: %clang_cl /Z7 -gno-codeview-command-line -gcodeview-command-line -### -- %s 2>&1 | FileCheck -check-prefix=ON %s
+// RUN: %clang_cl -target x86_64-windows /Z7 -gno-codeview-command-line -gcodeview-command-line -### -- %s 2>&1 | FileCheck -check-prefix=ON %s
 // disabled
-// RUN: %clang_cl /Z7 -gcodeview-command-line -gno-codeview-command-line -### -- %s 2>&1 | FileCheck -check-prefix=OFF %s
+// RUN: %clang_cl -target x86_64-windows /Z7 -gcodeview-command-line -gno-codeview-command-line -### -- %s 2>&1 | FileCheck -check-prefix=OFF %s
 
 // enabled, no /Z7
-// RUN: %clang_cl -gcodeview-command-line -### -- %s 2>&1 | FileCheck -check-prefix=ON %s
+// RUN: %clang_cl -target x86_64-windows -gcodeview-command-line -### -- %s 2>&1 | FileCheck -check-prefix=ON %s
 
 // GCC-style driver
-// RUN: %clang -g -gcodeview -gno-codeview-command-line -gcodeview-command-line -### -- %s 2>&1 | FileCheck -check-prefix=ON %s
-// RUN: %clang -g -gcodeview -gcodeview-command-line -gno-codeview-command-line -### -- %s 2>&1 | FileCheck -check-prefix=OFF %s
+// RUN: %clang -target x86_64-windows -g -gcodeview -gno-codeview-command-line -gcodeview-command-line -### -- %s 2>&1 | FileCheck -check-prefix=ON %s
+// RUN: %clang -target x86_64-windows -g -gcodeview -gcodeview-command-line -gno-codeview-command-line -### -- %s 2>&1 | FileCheck -check-prefix=OFF %s
diff --git a/clang/test/Driver/gcodeview-ghash.c b/clang/test/Driver/gcodeview-ghash.c
index c45c8296604e9..b78dbf6456ded 100644
--- a/clang/test/Driver/gcodeview-ghash.c
+++ b/clang/test/Driver/gcodeview-ghash.c
@@ -5,15 +5,15 @@
 // NO_GHASH-NOT: "-gcodeview-ghash"
 
 // default
-// RUN: %clang_cl /Z7 -### -- %s 2>&1 | FileCheck -check-prefix=NO_GHASH %s
+// RUN: %clang_cl -target x86_64-windows /Z7 -### -- %s 2>&1 | FileCheck -check-prefix=NO_GHASH %s
 // enabled
-// RUN: %clang_cl /Z7 -gcodeview-ghash -### -- %s 2>&1 | FileCheck -check-prefix=GHASH %s
+// RUN: %clang_cl -target x86_64-windows /Z7 -gcodeview-ghash -### -- %s 2>&1 | FileCheck -check-prefix=GHASH %s
 // disabled
-// RUN: %clang_cl /Z7 -gcodeview-ghash -gno-codeview-ghash -### -- %s 2>&1 | FileCheck -check-prefix=NO_GHASH %s
+// RUN: %clang_cl -target x86_64-windows /Z7 -gcodeview-ghash -gno-codeview-ghash -### -- %s 2>&1 | FileCheck -check-prefix=NO_GHASH %s
 
 // enabled, no /Z7
-// RUN: %clang_cl -gcodeview-ghash -### -- %s 2>&1 | FileCheck -check-prefix=NO_GHASH %s
+// RUN: %clang_cl -target x86_64-windows -gcodeview-ghash -### -- %s 2>&1 | FileCheck -check-prefix=NO_GHASH %s
 
 // GCC-style driver
-// RUN: %clang -g -gcodeview -gcodeview-ghash -### -- %s 2>&1 | FileCheck -check-prefix=GHASH %s
-// RUN: %clang -g -gcodeview -gcodeview-ghash -gno-codeview-ghash -### -- %s 2>&1 | FileCheck -check-prefix=NO_GHASH %s
+// RUN: %clang -target x86_64-windows -g -gcodeview -gcodeview-ghash -### -- %s 2>&1 | FileCheck -check-prefix=GHASH %s
+// RUN: %clang -target x86_64-windows -g -gcodeview -gcodeview-ghash -gno-codeview-ghash -### -- %s 2>&1 | FileCheck -check-prefix=NO_GHASH %s
diff --git a/clang/test/Misc/win32-elf.c b/clang/test/Misc/win32-elf.c
new file mode 100644
index 0000000000000..f75281dc41872
--- /dev/null
+++ b/clang/test/Misc/win32-elf.c
@@ -0,0 +1,5 @@
+// Check that basic use of win32-elf targets works.
+// RUN: %clang -fsyntax-only -target x86_64-pc-win32-elf %s
+
+// RUN: %clang -fsyntax-only -target x86_64-pc-win32-elf -g %s -### 2>&1 | FileCheck %s -check-prefix=DEBUG-INFO
+// DEBUG-INFO: -dwarf-version={{.*}}