libxcb/python dependency loop via tk/libX11

[macports@…]

I've just installed 1.9.1 and ran the self update and an update to any outdated ports of which there were none. I then tried to install git-core and the debug version of the command returned a bunch of this:

DEBUG: Searching for dependency: xorg-xcmiscproto DEBUG: Didn't find receipt, going to depspec regex for: xorg-xcmiscproto DEBUG: Searching for dependency: xorg-xextproto DEBUG: Didn't find receipt, going to depspec regex for: xorg-xextproto

before returning:

Error: Internal error: port lookup failed: too many nested evaluations (infinite loop?) Error: Status 1 encountered during processing. To report a bug, see <​http://guide.macports.org/#project.tickets>

I tried installing some of the dependencies to see if I could reduce the number and let ports move forward. bzip2 went in fine, python26 gave me the same error.

[blb@…]

Looks like this came in with r71258, since xorg-libxcb already wanted (indirectly) xorg-libX11...

[macports@…]

So is there any way around this while that issue gets sorted? I'm just trying to get git installed on my system, and really don't care about the X11 components at this stage. I won't be using the graphical git tools anytime soon.

[spyro@…]

Replying to macports@…:

So is there any way around this while that issue gets sorted? I'm just trying to get git installed on my system, and really don't care about the X11 components at this stage. I won't be using the graphical git tools anytime soon.

My temporary solution to this problem was to do the following workaround:

1. Open a terminal window
   
2. Enter the following (without quotes): "export EDITOR=/usr/bin/nano" (or /usr/bin/edit if you have textwrangler installed)
   
3. Enter the following (without quotes): "sudo port edit xorg-libX11"
   
4. Scroll down to the line " port:xorg-libxcb \ " (you will find it under depends_lib)
   
5. Delete the line
   
6. Press ctrl+o to write the file
   
7. Press ctrl+x to exit
   
8. You may now compile things again!

Keep in mind that this is only a temporary solution. The real solution would be for someone to fix this dependency loop. I spent about 4 hours today trying to figure my way out around this problem and dug up a solution on my own. For new macports users (and veterans doing a fresh install) it really is a showstopper.

I love macports - it makes my life without linux much easier, and I greatly appreciate the hard work of everyone who contributes to this project. It sure would be nice if there was some way to regression test these changes to the port tree before they go out into the wild.

[spyro@…]

Cc Me!

[jeremyhu (Jeremy Huddleston Sequoia)]

Your workaround will likely result in your MP libX11 using your system libxcb.

The problem here is that python pulls in a dependency on libX11 via tk. That is clearly the problem point. libX11 needs libxcb. libxcb needs python (to build). python shouldn't need X11.

I'll just delete the xcb dependency on python, so it can use the system python to build.

r71272

[tharant@…]

Cc Me!

[jean-daniel.guyot+macports@…]

Thank you very much for fixing this ! Had the problem here and I saw it was solved 30 minutes before. Yeah.

This solved the issue for xorg-xcb but it remains for xorg-xcb-proto. I fixed it locally by applying the same kind of patch than r71272.

[spyro@…]

I filed a bug report for this same issue in xorg-xcb-proto in Ticket #26387

[macports@…]

excellent! looks like it has started out building one of the dependencies, so looks like I'm back in business. Thanks for the very swift fix!