Description:

uclibc (pronounced yew-see-lib-see) is a c library for developing
embedded linux systems. it is much smaller than the gnu c library,
but nearly all applications supported by glibc also work perfectly
with uclibc. porting applications from glibc to uclibc typically
involves just recompiling the source code. uclibc even supports
shared libraries and threading. it currently runs on standard
linux and mmu-less (also known as uclinux) systems with support
for alpha, arm, cris, i386, i960, h8300, m68k, mips/mipsel,
powerpc, sh, sparc, and v850 processors.

if you are building an embedded linux system and you find that
glibc is eating up too much space, you should consider using
uclibc. if you are building a huge fileserver with 12 terabytes of
storage, then using glibc may make more sense. unless, for
example, that 12 terabytes will be network attached storage and
you plan to burn linux into the system's firmware...