[msvc] Allow MSVC toolchain driver to find the aarch64 / arm64 cross-compiler.

Starting with the Fall Creators Update, Windows 10 Desktop can run on
machines that are powered by aarch64 processors.

Microsoft call the aarch64 architecture "arm64". This patch maps
ArchType::aarch64 to "arm64" to allow the MSVC toolchain driver to find
the aarch64 / arm64 cross-compiler.

Patch by Chris January

Differential Revision: https://reviews.llvm.org/D44087

llvm-svn: 326744

diff --git a/clang/lib/Driver/ToolChains/MSVC.cpp b/clang/lib/Driver/ToolChains/MSVC.cpp
index ae41ee9..8458c03 100644 (file)
--- a/clang/lib/Driver/ToolChains/MSVC.cpp
+++ b/clang/lib/Driver/ToolChains/MSVC.cpp
@@ -752,6 +752,8 @@ static const char *llvmArchToWindowsSDKArch(llvm::Triple::ArchType Arch) {
     return "x64";
   case ArchType::arm:
     return "arm";
+  case ArchType::aarch64:
+    return "arm64";
   default:
     return "";
   }
@@ -769,6 +771,8 @@ static const char *llvmArchToLegacyVCArch(llvm::Triple::ArchType Arch) {
     return "amd64";
   case ArchType::arm:
     return "arm";
+  case ArchType::aarch64:
+    return "arm64";
   default:
     return "";
   }
@@ -784,6 +788,8 @@ static const char *llvmArchToDevDivInternalArch(llvm::Triple::ArchType Arch) {
     return "amd64";
   case ArchType::arm:
     return "arm";
+  case ArchType::aarch64:
+    return "arm64";
   default:
     return "";
   }