Placing data in .rodata (read only memory) is an actual useful application of const keyword. Not specific to embedded. Arguably there shouldn't have been multiple slightly different meanings of the keyword like that.

I don't know why you are now jumping to setjmp/longjmp, trying to make a point that somehow C is the worst programming languages ever, when all I am trying to argue is for sane programming practices, hinting that more complex features (line especially found in newer languages) are not solutions but part of the complexity problem.