first commit

nghttp2/third-party/mruby/mrbgems/mruby-error/mrbgem.rake

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+MRuby::Gem::Specification.new('mruby-error') do |spec|
+  spec.license = 'MIT'
+  spec.author  = 'mruby developers'
+  spec.summary = 'extensional error handling'
+
+  if build.cxx_exception_enabled?
+    @objs << build.compile_as_cxx("#{spec.dir}/src/exception.c", "#{spec.build_dir}/src/exception.cxx")
+    @objs.delete_if { |v| v == objfile("#{spec.build_dir}/src/exception") }
+  end
+end