[AArch64] [Windows] Emit unwind tables by default.

Unwind tables are necessary even in code that doesn't support
exceptions.  The tables are used for setjmp(), and by debuggers.

Differential Revision: https://reviews.llvm.org/D53618

llvm-svn: 345781

1 files changed, 5 insertions, 5 deletions

diff --git a/clang/lib/Driver/ToolChains/MSVC.cpp b/clang/lib/Driver/ToolChains/MSVC.cpp
index f60f39563fd..839f3136230 100644
--- a/clang/lib/Driver/ToolChains/MSVC.cpp
+++ b/clang/lib/Driver/ToolChains/MSVC.cpp
@@ -722,15 +722,15 @@ bool MSVCToolChain::IsIntegratedAssemblerDefault() const {
 }
 
 bool MSVCToolChain::IsUnwindTablesDefault(const ArgList &Args) const {
-  // Emit unwind tables by default on Win64. All non-x86_32 Windows platforms
-  // such as ARM and PPC actually require unwind tables, but LLVM doesn't know
-  // how to generate them yet.
-
   // Don't emit unwind tables by default for MachO targets.
   if (getTriple().isOSBinFormatMachO())
     return false;
 
-  return getArch() == llvm::Triple::x86_64;
+  // All non-x86_32 Windows targets require unwind tables. However, LLVM
+  // doesn't know how to generate them for all targets, so only enable
+  // the ones that are actually implemented.
+  return getArch() == llvm::Triple::x86_64 ||
+         getArch() == llvm::Triple::aarch64;
 }
 
 bool MSVCToolChain::isPICDefault() const {