Add default `host` target for cross compiling.

You don't have to define explicit `host` build target any more.

1 files changed, 11 insertions, 0 deletions

diff --git a/lib/mruby/build.rb b/lib/mruby/build.rb
index 40fd0f9fe..c101a237f 100644
--- a/lib/mruby/build.rb
+++ b/lib/mruby/build.rb
@@ -370,6 +370,17 @@ EOS
     attr_accessor :host_target, :build_target
 
     def initialize(name, build_dir=nil, &block)
+      unless MRuby.targets['host']
+        # add minimal 'host'
+        MRuby::Build.new('host') do |conf|
+          if ENV['VisualStudioVersion'] || ENV['VSINSTALLDIR']
+            toolchain :visualcpp
+          else
+            toolchain :gcc
+          end
+          conf.gem :core => 'mruby-bin-mrbc'
+        end
+      end
       @endian = nil
       @test_runner = Command::CrossTestRunner.new(self)
       super