1## OpenLibm 2 3OpenLibm is an effort to have a high quality, portable, standalone 4`libm` library. It can be used standalone in applications and 5programming language implementations. 6 7The project was born out of a need to have a good `libm` for the 8[Julia programming langage](http://www.julialang.org) that worked 9consistently across compilers and operating systems, and in 32-bit and 1064-bit environments. 11 12### History 13 14The OpenLibm code derives from the [FreeBSD 15msun](http://ftp.freebsd.org/pub/FreeBSD/FreeBSD/development/FreeBSD-CVS/src/lib/msun/) 16implementation, which in turn derives from [FDLIBM 175.3](http://www.netlib.org/fdlibm/). As a result, it includes a number 18of fixes and updates to FDLIBM that have accumulated over the years in 19`msun`, and optimized versions of many functions. 20 21### Platform support 22 23OpenLibm builds on Linux, Mac OS X, and Windows, and with little 24effort, should build on FreeBSD as well. It builds with both, GCC and 25clang. Although largely tested on x86, it also includes experimental 26support for ARM. The original `msun` also includes support for mips, 27sparc64, powerpc, ia64, and alpha. These are present in the OpenLibm 28source tree, but no attempt has been made to build any of these. 29 30### Build instructions 31 321. `make` or `make USEGCC=1` to build with GCC. This is the default on 33Linux and Windows. 342. `make USECLANG=1` to build with clang. This is the default on OS X. 35