darwin-debug doesn't seem to work

[timotheecour]

Bugzilla Link	13294
Version	unspecified
OS	MacOS X
CC	@jryans,@timotheecour

Extended Description

I built lldb from the svn using the instructions provided.
I tried the example:
darwin-debug --arch=i386 -- /bin/ls -al /tmp
but it keeps throwing the same help message whichever the arguments (except when i try to input an inexistant architecture):

NAME
darwin-debug -- posix spawn a process that is stopped at the entry point
for debugging.
etc...

[llvmbot]

From the docs "A unix socket must be supplied using the --unix-socket= option so the calling program can handshake with this process and get its process id."

Granted the help text is incorect which can be fixed.

You can see how this works by looking at LaunchInNewTerminalWithCommandFile() in lldb/source/Host/macosx/Host.mm.

If you want to modify the darwin-debug to not require a unix socket and skip the handshake that returns the pid of the newly spawned process, feel free to submit a patch where the "unix_socket_name" std::string object is checked to see if it is empty, and if so, maybe it just prints the new process info the STDOUT, and if it is non-empty, then it does what it does now.

The code that is causing darwin-debug to exit is in darwin_debug.cpp:249:

if (show_usage || argc <= 0 || unix_socket_name.empty())
    usage();