Index: llvm-toolchain-snapshot_13~++20210322120055+02b51e5316cd/clang/lib/Driver/ToolChains/Linux.cpp
===================================================================
--- llvm-toolchain-snapshot_13~++20210322120055+02b51e5316cd.orig/clang/lib/Driver/ToolChains/Linux.cpp
+++ llvm-toolchain-snapshot_13~++20210322120055+02b51e5316cd/clang/lib/Driver/ToolChains/Linux.cpp
@@ -161,6 +161,10 @@ std::string Linux::getMultiarchTriple(co
     if (D.getVFS().exists(SysRoot + "/lib/powerpc64le-linux-gnu"))
       return "powerpc64le-linux-gnu";
     break;
+  case llvm::Triple::riscv64:
+    if (D.getVFS().exists(SysRoot + "/lib/riscv64-linux-gnu"))
+      return "riscv64-linux-gnu";
+    break;
   case llvm::Triple::sparc:
     if (D.getVFS().exists(SysRoot + "/lib/sparc-linux-gnu"))
       return "sparc-linux-gnu";