I disagree that doing some manual fudging with GCC versions is the solution. We should really just be able to build the extensions with the stock GCC in Ubuntu 11.10.

Maybe it's not the solution, but could you at least add something to INSTALL until it's fixed?

I'm certainly not against that, but I don't use Ubuntu at all, so I don't know what the solution is. Someone else is welcome to add it themselves, or give me a patch.

Another case: http://chatlogs.musicbrainz.org/musicbrainz-devel/2012/2012-01/2012-01-04.html#T22-23-22-692784

It seems we need something like:

Note: If you are using Ubuntu 11.10, the collate extension currently does not work with gcc 4.6 and needs to be built with an older version such as gcc 4.4. To do this, run "sudo apt-get install gcc-4.4" and copy the changes in http://git.musicbrainz.org/gitweb/?p=musicbrainz-server.git;a=commitdiff;h=force-gcc-44 to the Makefile. Alternatively, there are instructions at http://www.infohit.net/blog/post/alternative-gcc-compilers-on-ubuntu-intrepid-and-jaunty.html for setting up and switching between multiple versions of gcc.

http://codereview.musicbrainz.org/r/1708/

The patch fixes the issue completely, it compiles just fine with GCC 4.6.