I have a Mac with
XCode 6.4 /Swift 1.2
You can restrict your pod file pods to fetch specific versions of libraries which support swift 1.2. Read release notes for each library you have in your pod file to find out specific version which works with swift 1.2.
This is how you can restrict pod library to specific version:
pod 'SwiftyJSON', '~> 2.1.0'
But I would strongly recommend to find a way to update Xcode to latest release version. Xcode 7 has lots of improvements and bug fixes. You will enjoy using it.