Allow generation of multiple gems for Windows

- This allows build gems for both VC6 and MinGW builts of Ruby.

    Rake::ExtensionTask.new('my_extension', GEM_SPEC) do |ext|
      ext.cross_compile = true
      ext.cross_platform = ['i386-mswin32', 'i386-mingw32']
    end

This is highly experimental and exposed the need to refactor
ExtensionTask internals. Right now it fires the compilation
process twice, which is suboptimal.

4 files changed, 51 insertions, 0 deletions

diff --git a/features/cross-package-multi.feature b/features/cross-package-multi.feature
new file mode 100644
index 0000000..a40aa33
--- /dev/null
+++ b/features/cross-package-multi.feature
@@ -0,0 +1,15 @@
+Feature: Generate multiple Windows gems from Linux
+
+  In order to keep compatibility with versions of Ruby on Windows
+  As a Gem developer on Linux
+  I want to build binary gems for One-Click Installer (old and new versions)
+
+  Scenario: package multiple gems for Windows
+    Given that my gem source is all in place to target two platforms
+    And I'm running a POSIX operating system
+    And I've installed cross compile toolchain
+    And I've already successfully executed rake task 'cross compile'
+    When rake task 'cross native gem' is invoked
+    Then rake task 'cross native gem' succeeded
+    And gem for platform 'x86-mswin32' get generated
+    And gem for platform 'x86-mingw32' get generated
diff --git a/features/step_definitions/compilation.rb b/features/step_definitions/compilation.rb
index 2056ad9..35e72dd 100644
--- a/features/step_definitions/compilation.rb
+++ b/features/step_definitions/compilation.rb
@@ -8,6 +8,11 @@ Given /^a extension cross-compilable '(.*)'$/ do |extension_name|
   generate_source_code_for extension_name
 end
 
+Given /^a extension '(.*)' multi cross\-compilable$/ do |extension_name|
+  generate_multi_cross_compile_extension_task_for extension_name
+  generate_source_code_for extension_name
+end
+
 Given /^a extension '(.*)' with forced platform '(.*)'$/ do |extension_name, forced_platform|
   generate_extension_task_for extension_name, forced_platform
   generate_source_code_for extension_name
@@ -24,6 +29,12 @@ Given /^that my gem source is all in place$/ do
   Given "a extension cross-compilable 'extension_one'"
 end
 
+Given /^that my gem source is all in place to target two platforms$/ do
+  Given "a safe project directory"
+  Given "a gem named 'gem_abc'"
+  Given "a extension 'extension_one' multi cross-compilable"
+end
+
 Given /^not changed any file since$/ do
   # don't do anything, that's the purpose of this step!
 end
diff --git a/features/support/file_template_helpers.rb b/features/support/file_template_helpers.rb
index f4ea86c..76bed50 100644
--- a/features/support/file_template_helpers.rb
+++ b/features/support/file_template_helpers.rb
@@ -65,6 +65,16 @@ end
 EOF
   end
 
+  def template_rake_extension_multi_cross_compile(extension_name)
+    <<-EOF
+require 'rake/extensiontask'
+Rake::ExtensionTask.new("#{extension_name}", SPEC) do |ext|
+  ext.cross_compile = true
+  ext.cross_platform = ['i386-mswin32', 'i386-mingw32']
+end
+EOF
+  end
+
   def template_extconf(extension_name)
     <<-EOF
 require 'mkmf'
diff --git a/features/support/generator_helpers.rb b/features/support/generator_helpers.rb
index 2910781..c0a8e01 100644
--- a/features/support/generator_helpers.rb
+++ b/features/support/generator_helpers.rb
@@ -60,6 +60,21 @@ module GeneratorHelpers
     end
   end
 
+  def generate_multi_cross_compile_extension_task_for(extension_name)
+    # create folder structure
+    FileUtils.mkdir_p "ext/#{extension_name}"
+
+    return if File.exist?("tasks/#{extension_name}.rake")
+
+    # create specific extension rakefile
+    # Building a gem?
+    if File.exist?("tasks/gem.rake") then
+      File.open("tasks/gem.rake", 'a+') do |ext_in_gem|
+        ext_in_gem.puts template_rake_extension_multi_cross_compile(extension_name)
+      end
+    end
+  end
+
   def generate_source_code_for(extension_name)
     # source C file
     File.open("ext/#{extension_name}/source.c", 'w') do |c|