It's not necessary to support armv6 anymore. The only iPhones with armv6 were the original and the 3G, which was released more than four years ago. The 3GS and everything since has been armv7. Every iPad has been armv7.

The last version of iOS to support armv6 was 4.2.1, released almost two years ago.

The latest SDK only supports iOS 5 and up (if you want to target 4 you have to install an old one), and there are no ARMv6 devices which can run iOS 5, so it makes sense.

It's actually iOS 4.3+

Ouch. Do you have to have two Xcodes side by side, or can you install old SDL into new Xcode?

Officially, side by side is the way to go. Unofficially, you can sometimes merge the actual SDK bundles into the most recent Xcode directory.

Just FYI: New Xcodes install into /Applications/Xcode.app (and things like instruments are now in /Applications/Xcode.app/bin/Developer/Instruments.app or something like that) and the old Xcode is in /Developer.

So, it's not as bad as it might seem.

You have to have two side by side.