From what i´ve studied you can use any of the hard good old ones, like C/C++ where EOS is being written itself, as you can see for yourself here:
https://steemit.com/eos/@dan/eos-developer-s-log-stardate-20176-30
This is from another post:
Scripting Language Independent
The EOS architecture can simultaneously support multiple programming languages. Initially EOS will support Wren and Web Assembly, but it could also support any other suitably high performance sandboxed language.
What would you consider a high performance sandboxed language?
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It´s the guy who wrote the text in the link that said that brother, i just ctrl+c / ctrl+v it hehehehehehe!
I really don´t know what it means by this expression. Maybe if you send an e-mail directly to the developers team, they can help you?
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