Add `-fpermissive` to C++ compiler flags.
MODIFY
travis_config.rb
travis_config.rb
@@ -40,7 +40,7 @@ MRuby::Build.new('cxx_abi') do |conf|
toolchain :gcc
conf.gembox 'full-core'
- conf.cc.flags += %w(-Werror=declaration-after-statement)
+ conf.cc.flags += %w(-Werror=declaration-after-statement -fpermissive)
conf.compilers.each do |c|
c.defines += %w(MRB_GC_FIXED_ARENA)
end

Add `-fpermissive` to C++ compiler flags.