From e11157c6689d4b155f6ba1fc23cd16f8bbfd0d4a Mon Sep 17 00:00:00 2001
From: Alexei Starovoitov <alexei.starovoitov@gmail.com>
Date: Wed, 10 Jun 2015 03:06:06 +0000
Subject: [PATCH] fix crash

fix segfault by checking for UnknownArch, since
getArchTypePrefix() will return nullptr for UnknownArch.

This fixes regression caused by r238424.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@239456 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/ExecutionEngine/RuntimeDyld/RuntimeDyldELF.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldELF.cpp b/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldELF.cpp
index b4a34e8acf3..5c39c5944e4 100644
--- a/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldELF.cpp
+++ b/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldELF.cpp
@@ -519,7 +519,8 @@ void RuntimeDyldELF::resolveMIPSRelocation(const SectionEntry &Section,
 }
 
 void RuntimeDyldELF::setMipsABI(const ObjectFile &Obj) {
-  if (!StringRef(Triple::getArchTypePrefix(Arch)).equals("mips")) {
+  if (Arch == Triple::UnknownArch ||
+      !StringRef(Triple::getArchTypePrefix(Arch)).equals("mips")) {
     IsMipsO32ABI = false;
     IsMipsN64ABI = false;
     return;