[CWB] easier CWB compilation with Spack

[David Lukeš]

Hi all,

in light of this recent thread 
<http://liste.sslmit.unibo.it/pipermail/cwb/2017-November/002953.html> 
re: compiling CWB from source, it occurred to me it might be useful to 
create a CWB package for Spack <http://spack.readthedocs.io/>. Spack is 
a cross-platform package manager which builds software from source, 
*automatically resolving dependencies* so you don’t have to. A second 
advantage is that *it doesn’t need to run with admin privileges*. You 
just need Git and a fairly recent version of Python 2 (preferably, 
Python 3 works as well but you might hit snags).

I added |cwb| and |cwb-perl| packages to a fork of Spack I maintain, so 
installing trunk CWB can now be done like this:

|git clone --depth 1 https://github.com/dlukes/spack.git cd spack # cwb 
is installed automatically as a dependency of cwb-perl ./bin/spack 
install cwb-perl # symlink the cwb-perl package into perl ./bin/spack 
activate cwb-perl # create a prefix where all relevant binaries will be 
symlinked # (change /path/to/prefix to a directory of your choice) 
./bin/spack view symlink /path/to/prefix cwb-perl # update your PATH 
export PATH="/path/to/prefix/bin:$PATH" # use cwb cwb-encode ... 
cwb-make ... cqp ... |

A practical note: when testing this on Arch Linux, I found out that flex 
2.6.4 doesn’t compile on my system. Fortunately, with Spack, you can 
request a specific version of a dependency:

|# list information about the flex package in Spack, including # 
available versions ./bin/spack info flex # install cwb-perl with 
specific version of flex ./bin/spack install 'cwb-perl^flex at 2.6.3' # etc. |

If you’d rather use Spack’s official repository 
<https://github.com/LLNL/spack> (though my fork differs only slightly), 
you can, just manually add the |cwb| and |cwb-perl| package definitions 
where they belong in Spack’s directory tree:

|git clone --depth 1 https://github.com/LLNL/spack.git cd spack mkdir -p 
var/spack/repos/builtin/packages/{cwb,cwb-perl} 
cwb=var/spack/repos/builtin/packages/cwb/package.py 
cwb_perl=var/spack/repos/builtin/packages/cwb-perl/package.py curl 
https://raw.githubusercontent.com/dlukes/spack/develop/$cwb -o $cwb curl 
https://raw.githubusercontent.com/dlukes/spack/develop/$cwb_perl -o 
$cwb_perl ./bin/spack install cwb-perl # etc. |

Note that if you have a working setup for installing CWB from source, 
you might as well keep using it :) But if you’re starting from scratch, 
you might find this easier, depending on circumstances. If this method 
doesn’t work for you, let me know via the issue tracker 
<https://github.com/dlukes/spack/issues/new> on GitHub.

Best,

David

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