Add possibility to set per-platform cross_config_options.

This is especially useful to set distinct library paths for different
target platforms.

1 files changed, 15 insertions, 2 deletions

diff --git a/lib/rake/extensiontask.rb b/lib/rake/extensiontask.rb
index 9b8135b..2d7b08e 100755
--- a/lib/rake/extensiontask.rb
+++ b/lib/rake/extensiontask.rb
@@ -12,7 +12,7 @@ module Rake
     attr_accessor :config_script
     attr_accessor :cross_compile
     attr_accessor :cross_platform
-    attr_accessor :cross_config_options
+    attr_writer :cross_config_options
     attr_accessor :no_native
     attr_accessor :config_includes
 
@@ -73,6 +73,19 @@ Rerun `rake` under MRI Ruby 1.8.x/1.9.x to cross/native compile.
       end
     end
 
+    def cross_config_options(for_platform=nil)
+      return @cross_config_options unless for_platform
+
+      # apply options for this platform, only
+      @cross_config_options.map do |option|
+        if option.kind_of?(Hash)
+          option[for_platform] || []
+        else
+          option
+        end
+      end.flatten
+    end
+
     private
     def define_compile_tasks(for_platform = nil, ruby_ver = RUBY_VERSION)
       # platform usage
@@ -136,7 +149,7 @@ Java extension should be preferred.
 
         # rbconfig.rb will be present if we are cross compiling
         if t.prerequisites.include?("#{tmp_path}/rbconfig.rb") then
-          options.push(*@cross_config_options)
+          options.push(*cross_config_options(platf))
         end
 
         # add options to command