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Just wait until you see the crazy optimizers for embedded systems. They take the complete code of a system into consideration, and, in a number of compile passes, reuses code snippets from app, libraries, and OS layer to create one big tangled mess that is hard to follow even if you have the source code...
Isn't that still the same exact process as a normal compiler except in the case of embedded systems your OS is like a couple kilobytes large and just compiled along with the rest of your code?
As in, are those "crazy optimizations" not just standard compiler techniques, except applied to the entire OS+applications?
In a way, yes. But it really creates a mess when the linker starts sharing code between your code of which you have sources, and then jumps in the middle of system code for which you don't have sources. And a pain in the whatever to debug.
Don't you have the code in most cases? Like with e.g. freeRTOS? That's fully open source
For a number of reasons people use commercial OSes in this world, too.
Does commercial mean closed source in this context though? It seems like a waste of resources not to provide the source code for an rtos.
Considering how small in size they tend to be + with their power/computational constraints I can't imagine they have very effective DRM in place so it shouldn't take that much to reverse engineer.
May as well just provide the source under some very restrictive license.
Yes, it is closed source, but you can buy a "source license". Which is painfully expensive.