With XCode 8.3 or lower, no values of variables are displayed:
When a variable T is output:
lldb> po t
Then XCode issues the following error message:
warning: Swift error in module testProject.
Debug info from this module will be unavailable in the debugger.
error: in auto-import:
failed to get module 'testProject' from AST context:
error: /Users/xxx/Library/Developer/Xcode/DerivedData/testProject-ancfblnaxqmiivgqakzxqkocqfrg/Build/Products/Debug-iphonesimulator/CocoaAsyncSocket/CocoaAsyncSocket.framework/Modules/module.modulemap:2:19: error: umbrella header 'CocoaAsyncSocket-umbrella.h' not found
umbrella header "CocoaAsyncSocket-umbrella.h"
I found few pages for this problem: Move header on top
However, it has not solved the problem. The problem might be CocoaPod. In the previous versions of CocoaPod, there was a problem that Pod Libraries could not be compiled. Because CocoaPod generates the umbrella-headers automatically.