I need to build one iOS app and one Mac OS app on the same machine. Mac OS app needs to run on 10.5, and even though Apple claims you can build with the 10.6 SDK and run on 10.5 by setting the right target value, it's not true. Simple things, like the name/version of libssl, are different on 10.5 and 10.6 which makes this impossible.
Anyway, so I'm about to try and install XCode 3.2.6 on the same machine as I have XCode 4 on - any tips/gotchas/guides?
Thanks!
That should work fine, however it's best to install XCode4 last. So if you install XCode3 you'll want to re-install XCode4 as well after (to keep the system tools at the latest version).
I'd also recommend XCode4 go into /Developer, and XCode3 goes into a folder with some other name, as it's had more time to be hammered out to work installed in different locations.
来源：https://stackoverflow.com/questions/5481545/xcode-4-and-xcode-3-2-6-side-by-side