Driver: Make sure to get the default arch name from the tool chain, not the 
host; the toolchain may differ based on command line arguments.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@67106 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Driver/Driver.cpp b/lib/Driver/Driver.cpp
index e809487..c2df48c 100644
--- a/lib/Driver/Driver.cpp
+++ b/lib/Driver/Driver.cpp
@@ -155,6 +155,8 @@
   ArgList *Args = ParseArgStrings(Start, End);
 
   Host = GetHostInfo(HostTriple);
+  // FIXME: This shouldn't live inside Driver, the default tool chain
+  // is part of the compilation (it is arg dependent).
   DefaultToolChain = Host->getToolChain(*Args);
 
   // FIXME: This behavior shouldn't be here.
@@ -306,7 +308,7 @@
   // When there is no explicit arch for this platform, get one from
   // the host so that -Xarch_ is handled correctly.
   if (!Archs.size()) {
-    const char *Arch = Host->getArchName().c_str();
+    const char *Arch = DefaultToolChain->getArchName().c_str();
     Archs.push_back(Arch);
   }