From: Per-erik Martin <lists@...>
Date: 2013-04-21T20:33:03+09:00
Subject: ruby 2.0 with tk 8.5 on Raspberry Pi

I'm building ruby-2.0.0-p0 on a Raspberry Pi running Raspbian wheezy,
which essentially is a debian linux variant for the armv6 and Pi. I also
need to have tk 8.5 with it... but I have run into a really strange
problem.

This is how it's built:
---
sudo apt-get install tcl8.5-dev
sudo apt-get install tk8.5-dev
pushd /usr/lib/
sudo ln -s tcl8.5/tclConfig.sh ./
sudo ln -s tk8.5/tkConfig.sh ./
popd
tar xzf ruby-2.0.0-p0.tar.gz
cd ruby-2.0.0-p0
./configure --disable-install-doc --prefix=/usr/local/ruby2
make
sudo make install
---

When I try out "irb" and some simple scripts, the ruby itself seems to
work fine. If I do "wish" that seems to work too. The configure and make
output doesn't show any problems as far as I can see. But when I do
"require 'tk'" it just hangs!  Hitting ctrl-C shows that it's hanging
(or looping) in this code:
---
# check a Tcl/Tk interpreter is initialized
until INTERP_THREAD[:interp]
  # Thread.pass
  INTERP_THREAD.run
end
---
That's line 1327 in tk.rb (the .run call). Then "exit" doesn't work, I
have to do a kill -9 to make irb terminate.

And now it gets really weird... In an attempt to figure out what it was
doing I attached an strace to the process... but then it suddenly starts
running as it should, and seems to work fine!

Now I can hardly run it with an strace on it all the time, so it doesn't
help unfortunately. :-P But perhaps it's clue for someone about what's
going on?

I have never come across this kind of behavior before, and I have some
experience. (25+ years as a systems programmer on unix/linux). I have
built different ruby versions on countless linux versions without any
problems. I'm at a loss here, no idea what to do about this.

Btw, I have of course tried the Raspberry Pi forums, but no response
yet...

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