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README.md
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OpenLibm is an effort to have a high quality, portable, standalone OpenLibm is an effort to have a high quality, portable, standalone
C mathematical library ([`libm`](http://en.wikipedia.org/wiki/libm)). C mathematical library ([`libm`](http://en.wikipedia.org/wiki/libm)).
It can be used standalone in applications It can be used standalone in applications and programming language
and programming language implementations. implementations.
The project was born out of a need to have a good `libm` The project was born out of a need to have a good `libm` for the
for the [Julia programming langage](http://www.julialang.org) [Julia programming langage](http://www.julialang.org) that worked
that worked consistently across compilers and operating systems, consistently across compilers and operating systems, and in 32-bit and
and in 32-bit and 64-bit environments. 64-bit environments.
### History ### History
The OpenLibm code derives from the The OpenLibm code derives from the [FreeBSD
[FreeBSD msun](http://svnweb.freebsd.org/base/head/lib/msun/) implementation, msun](http://svnweb.freebsd.org/base/head/lib/msun/) implementation,
which in turn derives from [FDLIBM 5.3](http://www.netlib.org/fdlibm/). which in turn derives from [FDLIBM
As a result, it includes a number of fixes and updates to FDLIBM 5.3](http://www.netlib.org/fdlibm/). As a result, it includes a number
that have accumulated over the years in `msun`, of fixes and updates to FDLIBM that have accumulated over the years in
and optimized versions of many functions. `msun`, and optimized versions of many functions.
### Platform support ### Platform support
OpenLibm builds on Linux, Mac OS X, and Windows, OpenLibm builds on Linux, Mac OS X, and Windows, and with little
and with little effort, should build on FreeBSD as well. effort, should build on FreeBSD as well. It builds with both GCC and
It builds with both GCC and clang. clang. Although largely tested on x86, it also includes experimental
Although largely tested on x86, support for ARM. The original `msun` also includes support for mips,
it also includes experimental support for ARM. sparc64, powerpc, ia64, and alpha. These are present in the OpenLibm
The original `msun` also includes support for source tree, but no attempt has been made to build any of these.
mips, sparc64, powerpc, ia64, and alpha.
These are present in the OpenLibm source tree,
but no attempt has been made to build any of these.
### Build instructions ### Build instructions
1. `make` or `make USEGCC=1` to build with GCC. 1. `make` or `make USEGCC=1` to build with GCC. This is the default on
This is the default on Linux and Windows. Linux and Windows.
2. `make USECLANG=1` to build with clang. 2. `make USECLANG=1` to build with clang. This is the default on OS X.
This is the default on OS X.