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39 lines
1.4 KiB
Markdown
39 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
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and programming language implementations.
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The project was born out of a need to have a good `libm`
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for the [Julia programming langage](http://www.julialang.org)
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that worked consistently across compilers and operating systems,
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and in 32-bit and 64-bit environments.
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### History
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The OpenLibm code derives from the
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[FreeBSD msun](http://svnweb.freebsd.org/base/head/lib/msun/) implementation,
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which in turn derives from [FDLIBM 5.3](http://www.netlib.org/fdlibm/).
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As a result, it includes a number of fixes and updates to FDLIBM
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that have accumulated over the years in `msun`,
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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,
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and with little effort, should build on FreeBSD as well.
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It builds with both GCC and clang.
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Although largely tested on x86,
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it also includes experimental support for ARM.
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The original `msun` also includes support for
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mips, sparc64, powerpc, ia64, and alpha.
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These are present in the OpenLibm source tree,
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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.
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This is the default on Linux and Windows.
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2. `make USECLANG=1` to build with clang.
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This is the default on OS X.
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