OpenLibm/README.md

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# OpenLibm
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[![Travis](https://travis-ci.org/JuliaMath/openlibm.svg?branch=master)](https://travis-ci.org/JuliaMath/openlibm)
[![AppVeyor](https://ci.appveyor.com/api/projects/status/sia04r4089rr19uc/branch/master?svg=true)](https://ci.appveyor.com/project/ararslan/openlibm-19152/branch/master)
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[OpenLibm](https://openlibm.org/) is an effort to have a high quality, portable, standalone
C mathematical library ([`libm`](http://en.wikipedia.org/wiki/libm)).
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
[Julia programming langage](http://www.julialang.org) that worked
consistently across compilers and operating systems, and in 32-bit and
64-bit environments.
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## Platform support
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OpenLibm builds on Linux, macOS, Windows, FreeBSD, OpenBSD, NetBSD, and
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DragonFly BSD. It builds with both GCC and clang. Although largely
tested and widely used on the x86 and x86-64 architectures, OpenLibm
also supports arm, aarch64, ppc64le, mips, wasm32, and s390(x).
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## Build instructions
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1. Use GNU Make to build OpenLibm. This is `make` on most systems, but `gmake` on BSDs.
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2. Use `make USEGCC=1` to build with GCC. This is the default on
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Linux and Windows.
3. Use `make USECLANG=1` to build with clang. This is the default on OS X, FreeBSD,
and OpenBSD.
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4. Use `make ARCH=wasm32` to build the wasm32 library with clang. Requires clang-8.
5. Architectures are auto-detected. Use `make ARCH=i386` to force a
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build for i386. Other supported architectures are i486, i586, and
i686. GCC 4.8 is the minimum requirement for correct codegen on
older 32-bit architectures.
## Acknowledgements
PowerPC support for openlibm was graciously sponsored by IBM.