bug#21521: 24.5; pdb default suggested command

[Stefan Kangas]

tags 21521 + patch
thanks

Stefano Pacifico <github@pacifico.cc> writes:

> When executing `M-x pdb`, the default suggested command is `pdb`, but I 
> couldn’t
> find any validation that standard Python distributions consistently install a
> symlink to`pdb.py` in any `bin` directory (as in the case of my system OS X
> 10.10.5).
>
> If the default command were `python -m pdb`, it would seemingly be compatible 
> with more systems.

This makes sense, and "python -m pdb" is also the recommended usage on
most resources I've been able to find.  On the system I'm on now, the
pdb command is missing.

But I think it's nice to user the shorter version when it's available,
so I suggest to use "python -m pdb" only as a fallback.

Please see the attached patch which does that.

Thanks,
Stefan Kangas

0001-Use-python-m-pdb-when-pdb-is-missing-in-M-x-pdb.patch
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