CODEWITHSUNDEEP
rubyrubygemsruby-c-extension
cedlemo
cedlemo

Reputation: 3334

Ruby C extension gem doesn't compile at installation

I have a little project that I want to share via a gem. This extension must be compiled on the user system. So the compilation must be done when the gem is installed.

My project is simple:

tree                                                                                                                                                                  
├── myext.gemspec
├── ext
│   └── myext
│       └── myext.c
│       └── extconf.rb
├── lib
│   ├── myext
│   └── myext.rb
├── Rakefile
└── test

I have checked the extconf.rb and the compilation works if I do 

ruby extconf.rb && make

I have a myext.gemspec:

Gem::Specification.new do |s|
  s.name        = 'myext'
  s.version     = '0.0.1'
  s.date        = '2015-04-22'
  s.summary     = "an extension"
  s.description = "an extension that is mine"
  s.authors     = ["cedlemo"]
  require "rake" #for FileList
  s.files       = FileList['lib/*/*.{so}',
                     'lib/*.{rb}'
                    ].to_a
  s.extensions = %w(ext/myext/extconf.rb)
  s.add_development_dependency 'rake-compiler', '~> 0' 
  s.license       = 'MIT'
end

and here is my Rakefile :

require "rubygems"
require "rake/extensiontask"

spec = Gem::Specification.load('myext.gemspec')

Rake::ExtensionTask.new "myext", spec do |ext|
  ext.lib_dir = "lib/myext"
end

When I build my gem, everything is fine :

gem build myext.gemspec

And when I install the gem I havn't any error message:

gem install myext-0.0.1.gem                                                                                                                                          
Building native extensions.  This could take a while...
Successfully installed myext-0.0.1
1 gem installed

My problem is that the C code is not compiled and I don't have any .so file installed:

/home/cedlemo/.gem/ruby/2.2.0/gems/myext-0.0.1/
├── ext
│   └── myext
│       ├── extconf.rb
│       └── Makefile
└── lib
    └── myext.rb

PS: I have read a lot of documentations (official or blogs ...) and everybody is doing its own stuff so it is not very clear and I can't find a solution so don't send me link to http://guides.rubygems.org/ for example.

Upvotes: 1

Views: 808

Answers (1)

matt
matt

Reputation: 79733

You haven’t included the source files in your files part of your gemspec, so there is nothing to compile when installing the gem. Make sure you include all needed files:

s.files = FileList['lib/**/*.rb', 'ext/**/*.{rb,c,h}']

You don’t need to include .so files, as they will be built during installation (and might not actually be .so). Also I don’t think you need to add to_a (a FileList basically is an array already).

Upvotes: 2

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