Static build support

lib/thermite/cargo.rb

@@ -110,17 +110,16 @@ def cargo_recommended_msg
     private
 
     def cargo_rustc_args
-      args = []
-      unless config.dynamic_linker_flags == '' || config.target_os == 'mingw32'
-        args.push(
+      if config.dynamic_linker_flags == '' || config.target_os == 'mingw32'
+        []
+      else
+        [
           '--lib',
           '--',
           '-C',
           "link-args=#{config.dynamic_linker_flags}"
-        )
+        ]
       end
-
-      args
     end
   end
 end

lib/thermite/config.rb

@@ -108,22 +108,31 @@ def library_name
     end
 
     #
-    # The basename of the Rust shared library.
+    # The basename of the shared library built by Cargo.
     #
-    def shared_library
-      @shared_library ||= begin
+    def cargo_shared_library
+      @cargo_shared_library ||= begin
         filename = "#{library_name}.#{shared_ext}"
         filename = "lib#{filename}" unless Gem.win_platform?
         filename
       end
     end
 
+    #
+    # The basename of the Rust shared library, as installed in the {#ruby_extension_path}.
+    #
+    def shared_library
+      @shared_library ||= "#{library_name}.so"
+    end
+
     #
     # Return the basename of the tarball generated by the `thermite:tarball` Rake task, given a
     # package `version`.
     #
     def tarball_filename(version)
-      "#{library_name}-#{version}-#{ruby_version}-#{target_os}-#{target_arch}.tar.gz"
+      static = static_extension? ? '-static' : ''
+
+      "#{library_name}-#{version}-#{ruby_version}-#{target_os}-#{target_arch}#{static}.tar.gz"
     end
 
     #
@@ -261,6 +270,13 @@ def dynamic_linker_flags
       @dynamic_linker_flags ||= RbConfig::CONFIG['DLDFLAGS'].strip
     end
 
+    #
+    # Whether to use a statically linked extension.
+    #
+    def static_extension?
+      ENV.key?('RUBY_STATIC') || RbConfig::CONFIG['ENABLE_SHARED'] == 'no'
+    end
+
     private
 
     def dlext

lib/thermite/tasks.rb

@@ -122,8 +122,8 @@ def define_build_task
         if cargo
           profile = ENV.fetch('CARGO_PROFILE', 'release')
           run_cargo_rustc(profile)
-          FileUtils.cp(config.cargo_target_path(profile, config.shared_library),
-                       config.ruby_path('lib'))
+          FileUtils.cp(config.cargo_target_path(profile, config.cargo_shared_library),
+                       config.ruby_extension_path)
         elsif !download_binary_from_custom_uri && !download_binary_from_github_release
           inform_user_about_cargo
         end

test/lib/thermite/config_test.rb

@@ -74,24 +74,40 @@ def test_shared_library
       config.stubs(:library_name).returns('foobar')
       config.stubs(:shared_ext).returns('ext')
       Gem.stubs(:win_platform?).returns(false)
-      assert_equal 'libfoobar.ext', config.shared_library
+      assert_equal 'foobar.so', config.shared_library
     end
 
     def test_shared_library_windows
       config.stubs(:library_name).returns('foobar')
       config.stubs(:shared_ext).returns('ext')
       Gem.stubs(:win_platform?).returns(true)
-      assert_equal 'foobar.ext', config.shared_library
+      assert_equal 'foobar.so', config.shared_library
     end
 
-    def test_tarball_filename
+    def test_cargo_shared_library
       config.stubs(:library_name).returns('foobar')
-      config.stubs(:ruby_version).returns('ruby12')
-      config.stubs(:target_os).returns('c64')
-      config.stubs(:target_arch).returns('z80')
+      config.stubs(:shared_ext).returns('ext')
+      Gem.stubs(:win_platform?).returns(false)
+      assert_equal 'libfoobar.ext', config.cargo_shared_library
+    end
+
+    def test_cargo_shared_library_windows
+      config.stubs(:library_name).returns('foobar')
+      config.stubs(:shared_ext).returns('ext')
+      Gem.stubs(:win_platform?).returns(true)
+      assert_equal 'foobar.ext', config.cargo_shared_library
+    end
+
+    def test_tarball_filename
+      stub_tarball_filename_params(false)
       assert_equal 'foobar-0.1.2-ruby12-c64-z80.tar.gz', config.tarball_filename('0.1.2')
     end
 
+    def test_tarball_filename_with_static_extension
+      stub_tarball_filename_params(true)
+      assert_equal 'foobar-0.1.2-ruby12-c64-z80-static.tar.gz', config.tarball_filename('0.1.2')
+    end
+
     def test_default_ruby_toplevel_dir
       FileUtils.stubs(:pwd).returns('/tmp/foobar')
       assert_equal '/tmp/foobar', config.ruby_toplevel_dir
@@ -180,6 +196,21 @@ def test_toml_config
       assert_equal expected, config(cargo_project_path: fixtures_path('config')).toml_config
     end
 
+    def test_static_extension_sans_env_var
+      ENV.stubs(:key?).with('RUBY_STATIC').returns(false)
+      RbConfig::CONFIG.stubs(:[]).with('ENABLE_SHARED').returns('yes')
+      refute config.static_extension?
+
+      RbConfig::CONFIG.stubs(:[]).with('ENABLE_SHARED').returns('no')
+      assert config.static_extension?
+    end
+
+    def test_static_extension_with_env_var
+      ENV.stubs(:key?).with('RUBY_STATIC').returns(true)
+      RbConfig::CONFIG.stubs(:[]).with('ENABLE_SHARED').returns('yes')
+      assert config.static_extension?
+    end
+
     private
 
     def config(options = {})
@@ -189,5 +220,13 @@ def config(options = {})
     def described_class
       Thermite::Config
     end
+
+    def stub_tarball_filename_params(static_extension)
+      config.stubs(:library_name).returns('foobar')
+      config.stubs(:ruby_version).returns('ruby12')
+      config.stubs(:target_os).returns('c64')
+      config.stubs(:target_arch).returns('z80')
+      config.stubs(:static_extension?).returns(static_extension)
+    end
   end
 end