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What’s the use of something like this

I'm assuming similar use cases to things like Proguard. If you need to provide your client with C code because they need to compile for a large range of architectures but they're not allowed to see the source code. It's a very unusual circumstance but it does happen.

Wouldn't you use a tool to do that automatically in your build process? I can't see using a web page to obfuscate an entire project, one file at a time.

I created the web page just as a demonstration more than a practical way to use it. So yes, you'd likely want a CLI app and feed your whole project to it.

wouldn't it be better to compile the libraries yourself? how many architectures are there? ia-32, amd64, arm, mips, power, ia-64 and that's about it.

Sometimes that may not be an option. It may not be linkable into an existing project's code base. Maybe the other project doesn't use an open source compiler. Maybe the client has a custom ISA.

Again if you're in need of a source code obfuscation tool you're already in a pretty strange place.

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