Why does the LLDB Debugger constantly fail to attach?

Question

I have seen a lot of answers for this question:

error: failed to attach to process ID

as switch to GDB

Answer 1

Make sure you have localhost mapped to 127.0.0.1 in your /etc/hosts file:

$ grep localhost /etc/hosts

If grep doesn't show 127.0.0.1 then add it:

$ sudo -i
# echo "127.0.0.1 localhost" >> /etc/hosts

_{^ That '#' is root's command prompt; don't type it otherwise you will comment-out the statement and nothing will happen}

NOTE Use >> and not >! (better is to edit it using vi or mate or whatever).

My /etc/hosts file shows (ignoring comments):

127.0.0.1       localhost
255.255.255.255 broadcasthost
::1             localhost
fe80::1%lo0     localhost