[PATCH] Make sure GDB uses a valid shell when starting the inferior and to perform the "shell" command

[Sergio Durigan Junior]

On Friday, July 24 2015, Paul Koning wrote:

> But if you omit a shell, is the user of that shell blocked from using
> gdb?  That’s not a good failure mode.  It seems to me that omitting a
> non-shell is much more forgiving: all that happens is that you don’t
> get the friendly error message.

As I said before, I agree with this rationale.  However, I just would
like to make it clear that if the shell is invalid, the user will still
be able to start inferiors because GDB will default to /bin/sh.

-- 
Sergio
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