Public bug reported:

After installing `lldb-4.0`, if I start lldb, I get a vanilla console
input line, and not a libedit/libreadline interface. Tab completion,
arrow keys, history, etc are all missing.

Curiously, on Ubuntu 16.04 Precise, lldb-3.8 exhibits proper command-
line editing but `lldb-4.0` does not; On 17.04 Zesty, neither package
does. I have not attempted to further root-cause the discrepancy.

ProblemType: Bug
DistroRelease: Ubuntu 17.04
Package: lldb-4.0 1:4.0-1ubuntu1
ProcVersionSignature: Ubuntu 4.10.0-38.42-generic 4.10.17
Uname: Linux 4.10.0-38-generic x86_64
ApportVersion: 2.20.4-0ubuntu4.5
Architecture: amd64
CurrentDesktop: Unity:Unity7
Date: Tue Oct 24 18:36:54 2017
InstallationDate: Installed on 2016-03-29 (574 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Beta amd64 (20160323)
SourcePackage: llvm-toolchain-4.0
UpgradeStatus: Upgraded to zesty on 2017-10-19 (5 days ago)

** Affects: llvm-toolchain-4.0 (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug zesty

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https://bugs.launchpad.net/bugs/1727125

Title:
  lldb build does not use libedit/readline for interface

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