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# Supported platforms
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| System | Support type | Supported versions | Notes |
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| GNU/Linux | Tier 1 | Linux >= 2.6.32 with glibc >= 2.12 | |
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| macOS | Tier 1 | macOS >= 10.7 | |
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| Windows | Tier 1 | Windows >= XP SP1 | MSVC 2008 and later are supported |
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| FreeBSD | Tier 1 | >= 9 (see note) | |
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| AIX | Tier 2 | >= 6 | Maintainers: @libuv/aix |
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| z/OS | Tier 2 | >= V2R2 | Maintainers: @libuv/zos |
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| Linux with musl | Tier 2 | musl >= 1.0 | |
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| SunOS | Tier 2 | Solaris 121 and later | Maintainers: @libuv/sunos |
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| MinGW | Tier 3 | MinGW32 and MinGW-w64 | |
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| Other | Tier 3 | N/A | |
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#### Note on FreeBSD 9
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While FreeBSD is supported as Tier 1, FreeBSD 9 will get Tier 2 support until
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it reaches end of life, in December 2016.
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## Support types
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* **Tier 1**: Officially supported and tested with CI. Any contributed patch
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MUST NOT break such systems. These are supported by @libuv/collaborators.
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* **Tier 2**: Officially supported, but not necessarily tested with CI. These
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systems are maintained to the best of @libuv/collaborators ability,
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without being a top priority.
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* **Tier 3**: Community maintained. These systems may inadvertently break and the
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community and interested parties are expected to help with the maintenance.
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## Adding support for a new platform
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**IMPORTANT**: Before attempting to add support for a new platform please open
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an issue about it for discussion.
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### Unix
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I/O handling is abstracted by an internal `uv__io_t` handle. The new platform
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will need to implement some of the functions, the prototypes are in
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``src/unix/internal.h``.
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If the new platform requires extra fields for any handle structure, create a
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new include file in ``include/`` with the name ``uv-theplatform.h`` and add
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the appropriate defines there.
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All functionality related to the new platform must be implemented in its own
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file inside ``src/unix/`` unless it's already done in a common file, in which
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case adding an `ifdef` is fine.
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Two build systems are supported: autotools and GYP. Ideally both need to be
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supported, but if GYP does not support the new platform it can be left out.
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### Windows
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Windows is treated as a single platform, so adding support for a new platform
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would mean adding support for a new version.
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Compilation and runtime must succeed for the minimum supported version. If a
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new API is to be used, it must be done optionally, only in supported versions.
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### Common
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Some common notes when adding support for new platforms:
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* Generally libuv tries to avoid compile time checks. Do not add any to the
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autotools based build system or use version checking macros.
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Dynamically load functions and symbols if they are not supported by the
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minimum supported version.
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