A toolchain is a set of tools, binaries, and libraries used to build applications to run on a computer platform. In Yocto, the toolchains are based on GNU components.
A GNU toolchain contains the following components:
These components are enough to build bare metal applications, bootloaders like U-Boot, or operating systems like the Linux kernel, as they don't need a C library and they implement the C library functions they need. However, for Linux user space applications, a POSIX-compliant C library is needed.
The GNU C library, glibc, is the default C library used in the Yocto project. Yocto is introducing support...