Hi Antonio / Ruby Team, You had a patch ready for this here[1] (before bullseye) or somewhere else, right? If possible could you make an upload? This would help ruby ext cross build, which would be pretty cool. [1]: https://salsa.debian.org/ruby-team/ruby-defaults/-/tree/crossbuild On Mon, 15 Feb 2021 21:20:23 +0100 Helmut Grohne <helmut@subdivi.de> wrote: > Package: libruby2.7 > Version: 2.7.2-4 > User: debian-cross@lists.debian.org > Usertags: ftcbfs > Control: affects -1 + src:ruby-json > > ruby-json (and many others) fail to cross build from source in the same > way. dh_ruby runs ruby ... extconf.rb, which configures for the build > architecture and then some dependency (usually ruby/config.h) goes > missing as it is only installed for the host architecture. > > As far as I can tell, the root cause is the extconf.rb invocation. For > cross compiling, one should pass -I /somepath to ruby such that > /somepath contains the host's rbconfig.rb. Unfortunately, we cannot just > pass -I /usr/lib/<triplet>/ruby/2.7.0 here, because doing so results in > ruby attempting to load foreign extension modules. We need a different > path here. > > Let me give a little excursion into other ecosystems to give you a > better idea what is needed here: > > Perl has a file that is similar to rbconfig.rb and it is simply called > Config.pm. It normally resides in /usr/lib/x86_64-linux-gnu/perl-base. > Using this path would have the same issue. Therefore, there also is > /usr/lib/x86_64-linux-gnu/perl/5.32.1 containing a symlink. > > Python has a similar file _sysconfigdata.py. Rather than disambiguating > the containing directory, Python renames it and arrives at things like > _sysconfigdata__x86_64-linux-gnu.py. Rather than specifying a directory > to to search for modules, a separate environment variable can specify > its location. > > The Ruby way is like Perl. I suggest copying this approach. To that end, > I request that ruby2.7-dev adds a new, architecture-dependent directory > that contains a symlink to the matching rbconfig.rb. Then dh_ruby can > pass that directory via -I and things should work. > > Does that sound good to you? Do you have any preference on the naming? > > No, this is not meant for bullseye. > > Helmut > > > -- Best, Nilesh
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