When I try to Archive my application on Xcode 7.3.1, I am getting following error:
error: Invalid bitcode version (Producer: \'800.0.35.0_0\' Reader:
I also faced the same problem, and as suggested by @Nate, the issue was because of a third party SDK integrated in our project using Cocoapods.
To help me figure out which one of the 15 pods i had in the project was responsible, i did the following:
⋆(you can also try something like binary search, wherein you delete the first half pods in your Podfile and see if the new project archives)
Once you've figured out the library causing the issue, keep downgrading the library by explicitly specifying the version in Podfile, until the project archives successfully. And then you can use that version of the library to archive and upload to the app store.