[driver] If no OSX or iOS target has been specified and we're compiling for

armv7, go ahead as assume we're targeting iOS.
rdar://10147774

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@140668 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Driver/ToolChains.cpp

@@ -564,6 +564,12 @@ void Darwin::AddDeploymentTarget(DerivedArgList &Args) const {
       }
     }
 
+    // If no OSX or iOS target has been specified and we're compiling for armv7,
+    // go ahead as assume we're targeting iOS.
+    if (OSXTarget.empty() && iOSTarget.empty())
+      if (getDarwinArchName(Args) == "armv7")
+        iOSTarget = "0.0";
+
     // Handle conflicting deployment targets
     //
     // FIXME: Don't hardcode default here.