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40 lines
1.6 KiB
Markdown
40 lines
1.6 KiB
Markdown
# OpenLibm
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[](https://travis-ci.org/JuliaLang/openlibm)
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[OpenLibm](http://www.openlibm.org) 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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## Platform support
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OpenLibm builds on Linux, Mac OS X, Windows, FreeBSD, and OpenBSD. It
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builds with both GCC and clang. Although largely tested and widely
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used on x86 architectures, openlibm also supports ARM and
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powerPC.
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## Build instructions
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1. Use `make` to build OpenLibm.
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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.
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3. Use `make USECLANG=1` to build with clang. This is the default on OS X
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and FreeBSD.
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4. 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
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i686. GCC 4.8 is the minimum requirement for correct codegen on
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older 32-bit architectures.
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5. On OpenBSD, you need to install GNU Make (port name: `gmake`) and a recent
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version of `gcc` (tested: 4.9.2), as the default version provided by OpenBSD
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is too old (4.2.1). If you use OpenBSD's port system for this (port name:
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`gcc`), run `make CC=egcc` to force Make to use the newer `gcc`.
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## Acknowledgements
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PowerPC support for openlibm was graciously sponsored by IBM.
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