I don't know the details, but once it is proven that achieving lld/mold/sold-level performance is technically feasible, it shouldn't be extremely hard to achieve similar success for macOS.
CRT object files which contain process startup routines are not in a fixed directory. Unfortunately compilers have to be hard-coded to contain an appropriate directory name.
I could buy bikes too, but as you wrote that's not enough to make a living. This is my full time project. I could earn a mid 6 figure salary if I work for a big tech, and I think I'm creating a more valuable program than I did when I was working for a big tech, and in return I make money that counts in "fancy bicycle" unit... I think it's not wrong to say it didn't work quite well.
So the chibicc book is not available yet. I'm busy working on the other project (the mold linker) and don't have time to work on it. That being said, I believe the repo is still very valuable for those who want to learn how easy it is to implement a simple C compiler. chibicc's each commit was carefully written so that you can read one commit at a time. I'd recommend starting from the initial commit and observe how each feature (`if`, `for`, local variables, global variables, etc.) is implemented by following each commit.
I don’t know much about the European job market, but you can see lots of examples of US job positions and their salaries at websites such as https://www.levels.fyi.
I'm not sure if io_uring can improve mold's performance, as it has to access random locations while copying file contents to apply relocations. Currently, we mmap all input files and an output file and use memcpy to copy file contents.
It can create Mac executables, but mold/macOS is still in pre-alpha and no one should expect it to work for their programs. Once it becomes out of beta, I'll release it as mold 2.0, so please wait for it.
That's an even crazier goal which is probably 100x harder than writing a 10x faster linker. But I believe it's technically doable. At least, the world needs more crazy people who believe it is technically doable and take it as a challenge. If I get $$$ by selling the mold project to a big tech, I might be able to create a team with that money to tackle that crazy goal...
I want to write a book about linkers so that the knowledge I earned during the development of the lld and mold linkers wouldn't lost, but I don't have enough time to do that!
I didn't take it as an offense, so don't say sorry! I just wanted to say that if a senior dev wants to earn $1M in a few years, they can just find a job and do whatever assigned to them there. They didn't have to take a risk of starting a completely new ambitious open-source project to earn that much.