Add `target/host-cxx.rb` to compile `mruby` with `cxx_abi`.
ADD
target/host-cxx.rb
+MRuby::Build.new do |conf|
+ toolchain :gcc
+
+ enable_debug
+ # include the default GEMs
+ conf.gembox 'full-core'
+
+ # C compiler settings
+ conf.cc.defines = %w(MRB_ENABLE_DEBUG_HOOK)
+ conf.enable_debug
+ conf.enable_cxx_abi
+ conf.enable_test
+end

Add `target/host-cxx.rb` to compile `mruby` with `cxx_abi`.