|Stable release||2.0.0 / December 20, 2012|
|Type||C standard library on embedded systems|
Newlib is a C standard library implementation intended for use on embedded systems. It is a conglomeration of several library parts, all under free software licenses that make them easily usable on embedded products.
It was created by Cygnus Support as part of building the first GNU cross-development toolchains. It is now maintained by Red Hat developer Jeff Johnston, and used in most commercial and non-commercial GCC ports for non-Linux embedded systems.
System Calls 
The section System Calls of the Newlib documentation describes how it can be used with many operating systems. Its primary use is on embedded systems that lack any kind of operating system; in that case it calls a board support package that can do things like write a byte of output on a serial port, or read a sector from a disk or other memory device.
Newlib is included in commercial GCC distributions by Atollic, CodeSourcery, Code Red, KPIT, Red Hat and others, and receives support from major embedded-processor architecture vendors such as ARM and Renesas. It is used as the standard C library in Cygwin, as well as being one standard C library among several for AmigaOS version 4.
As of 2007[update], devkitARM, a popular toolchain for programming homebrew software for Nintendo DS, Game Boy Advance systems and the standard PlayStation Portable homebrew SDK include Newlib as their C library, as well as devkitPPC, a popular Wii and GameCube homebrew development platform. The Open-R SDK for Sony AIBO is also based on Newlib on top of the non-Unix Aperios.
- "Native Client: Getting Started Tutorial". Retrieved 16 February 2013.
- von Hagen, William L. (2006). The Definitive Guide to GCC, Second Edition. Berkeley, CA: Apress. pp. 289–290. ISBN 1-59059-585-8.
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