automated coding style tool

[Tom Tromey]

Simon> If we don't like what the tool outputs, we can argue over than
Simon> and change the tool.

Yeah - but that's where we're already at.  Like, I ran clang-format on
gdb and read the diffs and found a bunch of things I didn't like.  IIRC
the main offenders were bin-packing.  I imagine Pedro did this too,
since he's made similar comments in the past.

I at least CCd myself on upstream bugs against the tool.  I commented
on some, maybe filed some too (don't remember).

I'm not super interested in hacking on clang-format, but the tool is
there and all the information for someone who is.

Simon> Also, if are missing some features to get the output we want, nobody is
Simon> going to magically implement them for us.  And if we don't use the tool,
Simon> there's no motivation for us either to go implement the changes.  I
Simon> think that the only way to get the ball rolling is to start using the
Simon> tool, even if the output is not ideal, and then if there's something
Simon> really annoying, one of us *might* have the motivation to go improve the
Simon> tool.

I'm in favor of using a tool but my view is that it has to meet some
minimal standard of usefulness.  I just think clang-format does not do
this.

Tom