Index: lib/Driver/ToolChains.cpp
===================================================================
--- lib/Driver/ToolChains.cpp	(revision 279820)
+++ lib/Driver/ToolChains.cpp	(working copy)
@@ -2769,6 +2769,7 @@
   case llvm::Triple::armeb:
   case llvm::Triple::bpfel:
   case llvm::Triple::bpfeb:
+  case llvm::Triple::mips64:
   case llvm::Triple::thumb:
   case llvm::Triple::thumbeb:
   case llvm::Triple::ppc:
@@ -3502,7 +3503,8 @@
   // When targeting 32-bit platforms, look for '/usr/lib32/crt1.o' and fall
   // back to '/usr/lib' if it doesn't exist.
   if ((Triple.getArch() == llvm::Triple::x86 ||
-       Triple.getArch() == llvm::Triple::ppc) &&
+       Triple.getArch() == llvm::Triple::ppc ||
+       Triple.getArch() == llvm::Triple::mips) &&
       D.getVFS().exists(getDriver().SysRoot + "/usr/lib32/crt1.o"))
     getFilePaths().push_back(getDriver().SysRoot + "/usr/lib32");
   else