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I'm not quite sure what exactly the author's point is.

Yes, you could embed images in ELFs, too, if you really wanted, but why? There's no standardized way to do it, and putting the images in separate files is easier.

There is a standard way to embed any file into an ELF. The program "objcopy" creates object files from arbitrary input files. You then simply link the objects into your executable. The program can then access those arbitrary embedded data chunks by their symbol names, just as if they were literal strings in the source code.

I explain how to do this in the context of embedding a version file here: https://stackoverflow.com/questions/16349557/does-gcc-have-a...

If we're comparing platforms, Xcode (Apple's IDE for iOS/macOS apps) runs pngcrush on all PNG assets by default.

I don't expect it to be different on Linux or any other operating system.