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Newlib is a multitarget libc implementation. This commit only adds the posibility to build it easily, and setup it so that it can be used with our custom toolchain in order to compile our future userland executables. It is still missing the required syscall implementations, since most (if not all technically) have yet to be implemented inside the kernel. We should now quickly implement the first few ones (exit, fds, etc ...) in order to REALLY compile our own program.
Our previous libc implementation simply included the most basic mem* functions and such, commonly used inside the kernel. This worked well when working with a 'bare' gcc target (no real libc), but this is no longer the case. This library of useful and common libc function implementations has now been renamed to 'libk' instead.
These are now always present inside our gc target's include directory. If someone encounters a problem with header include paths, they should just use our target instead of the system they've installed.
The files/directories to be cleaned are stored inside a variable. This lets the included build.mk define what should or should not be cleaned along with their target, instead of having a big chunk of arbitraty RM targets in the main Makefile.
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LibC
No way am I implementing my own libc !
Candidates
Here are the plausible candidates for our libc implementation.