[CMake] FindPackage(Ruby) on Ubuntu LTS

[David Cole]

On Wed, Oct 24, 2012 at 11:57 AM, David Cole <david.cole at kitware.com> wrote:
> On Wed, Oct 24, 2012 at 9:36 AM, Chris <ruunhb at googlemail.com> wrote:
>> Hio,
>>
>> I have some problems with the CMake-Module findRuby.cmake with using ruby1.8
>> and ruby1.9 on Ubuntu 12.04 LTS (via apt).
>>
>> I'm not sure, but i guess it worked some month ago and its maybe broken due
>> to an update (or i missed some important aspect in my setup)
>>
>> A simple find_package(Ruby) call in a CMakeLists.txt results in the error:
>> -- Could NOT find Ruby (missing:  RUBY_LIBRARY) (found version "1.9.1")
>> -- Configuring done
>> -- Generating done
>> -- Build files have been written to: /home/chris/repos/build
>>
>> $ cmake --version
>> cmake version 2.8.7
>>
>> $ ruby -v
>> ruby 1.9.3p0 (2011-10-30 revision 33570) [x86_64-linux]
>>
>> $ ls /usr/lib | grep ruby
>> libqtruby4shared.so.2
>> libqtruby4shared.so.2.0.0
>> libruby1.8.so
>> libruby1.8.so.1.8
>> libruby1.8.so.1.8.7
>> libruby1.8-static.a
>> libruby-1.9.1.so
>> libruby-1.9.1.so.1.9
>> libruby-1.9.1.so.1.9.1
>> libruby-1.9.1-static.a
>> ruby
>>
>> Any ideas?
>>
>> Chris
>> --
>>
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>
>
> The following 5 commits were merged to 'master' for FindRuby.cmake
> *after* CMake 2.8.7, and probably fix the problem you're seeing. Can
> you try with 2.8.8 or later?
>
>
> # to inspect and figure things out:
>
> $ gitk -- Modules/FindRuby.cmake &
>
>
> # to show the series of commands that came after 2.8.7 based on commit
> hashes revealed by the manual inspection:
>
> $ git log 93c55ec1~1..854e7623 -- Modules/FindRuby.cmake
>
> commit 854e76237ce3e8f03d9cabcad1f8f37e04992ad3
> Author: Rolf Eike Beer <eike at sf-mail.de>
> Date:   Fri Feb 17 18:06:07 2012 +0100
>
>     FindRuby: clean up querying variables from Ruby
>
>     Newer Ruby versions (from 1.9 onward) seem to warn if you query
> Config::CONFIG
>     and print a warning to use RbConfig instead. RbConfig seems to also work in
>     older versions, at least in 1.8. Use a macro to query RbConfig
> first and only
>     if that doesn't give anything fall back to Config.
>
> commit 409aeafa2518a1cd38709810ba765860ef21aeb8
> Author: Rolf Eike Beer <eike at sf-mail.de>
> Date:   Wed Jan 25 17:26:43 2012 +0100
>
>     FindRuby: do not blindly set version to 1.8.0
>
>     RUBY_VERSION was always set, even if no RUBY_EXECUTABLE was found. While it
>     may make sense to assume a default version if we can't execute the
> binary, it
>     certainly doesn't make sense to report a version if there is no
> executable at
>     all.
>
> commit a9bca052f8ff013d8f47cf365495d2c8d0a2e70f
> Author: Alex Neundorf <neundorf at kde.org>
> Date:   Thu Jan 5 21:58:49 2012 +0100
>
>     FindRuby.cmake: add more debug output
>
>     Alex
>
> commit 3db2c8b9eafe4cc1d3a6e9d1f3bfc90764544d01
> Author: Alex Neundorf <neundorf at kde.org>
> Date:   Thu Jan 5 21:57:11 2012 +0100
>
>     FindRuby: add more possible library names (for ubuntu, #12172)
>
>     Alex
>
> commit 93c55ec1421a2cf43dbcaf9afd0528c8dda42de5
> Author: Alex Neundorf <neundorf at kde.org>
> Date:   Thu Jan 5 21:53:02 2012 +0100
>
>     FindRuby: fix usage of RUBY_VERSION_MAJOR (#12172)
>
>     Alex
>
>
>
> HTH,
> David



Also.... if the libs reported by your find only go up to 1.9.1, but
ruby itself reports 1.9.3..... where is it getting it's libs from? Do
you perhaps need to update a dev package for ruby?