Why Does Obj-C Library Code Recompile when building for release?

[Robert S.138]

I noticed that when I make a change to my code and build for debug, only my code gets recompiled.  But when I build for Distribution, either for the App Store or for Ad Hoc distribution, the entire 800+ files in the Offical Objective C Dropbox Library gets recompiled.  It is not too much of a bother since I don't build for distribution that often, but it does take almost a minute on my Mac Mini, whereas by app alone takes only a few seconds.  I am using CoCo Pods to handle the Obj-C library, according to the Dropbox installation instructions.

[Greg-DB]

I'm not familiar enough with the Xcode build system to say confidently what the issue may be, but there's a post here about an issue that sounds like this:

https://stackoverflow.com/questions/39588223/xcode-8-recompiling-complete-code-everytime

I'll ask the team to review this though.

[Robert S.138]

That problem is close, but has one major difference.  In their case the full recompile happens with every kind of build.  In my case the recompile only happens when I build for release (using Archive).  When I build for debug, the Dropbox library does not recompile.  As I said it is a small issue since I am almost always building for debug,  and there is no issue there.