A major change in Xcode 5.1 is that the version of clang that it contains no longer accepts unknown/invalid arguments. You are trying to build something that uses arguments -fsingle-precision-constant
and -fvariable-expansion-in-unroller
and these are no longer legal.
You must take this up with whoever is responsible for whatever it is you are trying to build (in this case, something called "nds4ios", apparently). They need to create new source code whose build commands do not include bad arguments.
Alternatively, revert temporarily to the clang inside Xcode 5.0.2. To do so, install Xcode 5.0.2, and then, in Xcode 5.1, open Preferences, switch to the Locations pref pane, and switch the Command Line Tools pop-up menu to Xcode 5.0.2.
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