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