Make the "python" command resemble the standard Python interpreter

[Tom Tromey]

>>>>> "Yit" == Khoo Yit Phang <khooyp@cs.umd.edu> writes:

Yit> Attached is a new patch that uses another way to disable the readline
Yit> module, which works with pdb.set_trace(). However, readline support
Yit> still doesn't work with pdb. The reason is because pdb uses raw_input,
Yit> which in turn uses sys.stdin/sys.stdout to determine whether to use
Yit> readline, but GDB replaces sys.stdin/sys.stdout with it's own
Yit> file-like objects that isn't recognized as a tty by Python.

This sounds like http://sourceware.org/bugzilla/show_bug.cgi?id=12150
Maybe we should try to fix that instead?

Yit> Making Python's readline module work under GDB is not possible, since
Yit> it re-initializes libreadline and generally assumes that libreadline
Yit> is completely under Python's control (and libreadline itself has no
Yit> support for nesting/reentrancy).

The initialization shouldn't be a problem.

Calling rl_initialize multiple times is ok -- readline() itself calls
it.

I don't know about the reentrancy though.  Also, IIRC, gdb uses the
unusual async interface.  Maybe that raises some issues.

Tom