When developing for the web or mobile apps, you’ll occasionally want to build an extension for your application. A extension is a new concept in app development. An extension is a full app that you install on your phone or computer and can be extended by other apps to add new features.
Gem native extensions are built with the gem native library, which is the gem native extension system. This article will talk about how to create a native extension for your phone or desktop.
Check your gem configuration
If you are building your extension with the gem console, your configuration may be missing an extension dependency.
The gem console requires a native extension to be installed with the gem, which is done through the installation process. If this extension was not installed, it may not be recognized by the gem.
To check if an extension is supported by yourgem, use the native extension support command. This should return 0 or 1 as an option.
Check your extconf.rb file
If you installed the extension using the gem install command, then your extconf.rb file should be saved to your local machine and loaded when you run gem install or later. If not, then make sure that you have enough rights to access your extension’s files.
Check your Makefile
If you are building the gem native extension for Windows, then you may need to change the build system used.
On Windows, Microsoft uses Visual Studio Tools for Development. This is a community-developed set of tools that integrate with the development environment provided by Visual Studio.
However, this set of tools is not included in the standard Windows install, so you must download and install it. Once installed, open a command prompt and navigate to the directory where you have downloaded and installed Gem::ext::builderror.
Now type gem build error and watch as your extension run! It will print an error stating that it could not build the native extension due to an unrecognized file or format type.
Reinstall your gem package
If you installed the gem through a gem package, you can now perform a simple reinstall to update your gem to the latest release.
To do this, open the terminal and navigate to your new location of the gem with this command:
$ bundle install –deployment
This will pull down the latest release of the gem into your environment. You will need to run this command twice, once for each deployment you want to use.
Performing an upgrade is similar, but instead of running bundle update , you run bundle install –deployment . This would pull down the updated version instead.
Run gem install with the –clean-extensions option
When building a gem extension, it is very important to run gem install with the –clean-extensions option. This will remove any non-gem files from your extension.
This will help ensure that your extension does not include any dependencies for other extensions, or for other gems. If you do include a dependency, you can tell it to install it with the native extension method, instead of using the Ruby on Rails method.
Reconfigure your gem package with rbenv or chruby
If you are running a development environment with rbenv, use the following command to reconfigure your Ruby on Rails application:
$ rbenv install chruby
If you are using chruby, use the following command to reconfigure your Ruby on Rails application:
$ chruby -S rubinetails
Gem Native Extensions are available through gem install native_gem_extension but they do not seem to be active. You can check this by running gem info native_gem_extension or visiting its website. If it is not active, add it using the following command:
$ native_gem_extension –activate
Set the RBENV_VERSION or CHRB_VERSION environment variable
When using the rbenv command line interface, you can set the RBENV_VERSION or CHRB_VERSION environment variables to obtain specific versions of rbenv and chrp. These are important when installing gems because they cannot be installed without them!
When using the gemrc gemrc tool, you can set both RBENV_VERSION and CHRB_VERSION to obtain specific versions of gem-rc. This helps with updating gems as well as keeping a consistent GLib environment when installing new gems.
Bullet point: Use Bundler in your project files
To use Bundler in your project files, create a file named .bundler/plugin/project.
Use a different version of Ruby for running gems from source
If you are running the gem from source, make sure to use the latest version of Ruby. Version 6 is the latest version available forgem Native Extensions.
Version 5 of Ruby does not support Native Extensions yet, so you must use that version to run your extensions. Development versions of Ruby come in regular and rapid release, which has different features and support.
Rapid releases have more frequent updates, making them more current than development versions. Development versions may have underlying changes made before a rapid release does not have those changes applied.
This article will go over some differences between the two versions, however only looking at differences between syntax and features.