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

Apple likes to move forward. So setting gdb as the debugger for all new projects is not an option.

Sometimes, you have to reset the iOS Simulator to clean up the debugger.

Answer 2

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