My biggest reason for wanting FFI at compile-time is to be able to use 
libraries that are wrappers around C libraries. For example for my Arduino 
stuff I wrote a macro that reads an image file and converts that to an array of 
bytes that is directly inserted into your code (this is how sprites are done on 
these devices). But to do that I needed to write my own image handling library 
because I couldn't use the ones that exist because they require some third 
party library to actually do the image handling.

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