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Also, fixed a minor typo in compiler_support.rst. Reviewed By: jeffbailey, gchatelet Differential Revision: https://reviews.llvm.org/D146112
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==================
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The LLVM C Library
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==================
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.. warning::
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The libc is not complete. If you need a fully functioning C library right
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now, you should continue to use your standard system libraries.
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Introduction
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============
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The libc aspires to a unique place in the software ecosystem. The goals are:
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- Fully compliant with current C standards (C17 and upcoming C2x) and POSIX.
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- Easily decomposed and embedded: Supplement or replace system C library
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functionality easily. This is useful to get consistent math precision across
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systems, or updated memory operations for newer microarchitectures. These
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pieces will work on Linux, MacOS, Windows, and Fuchsia.
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- The creation of fully static binaries without license implications.
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- Increase whole program optimization opportunities for static binaries through
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ability to inline math and memory operations.
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- Reduce coding errors by coding in modern C++ through the use of lightweight
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containers during coding that can be optimized away at runtime.
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- Permit fuzzing and sanitizer instrumentation of user binaries including the
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libc functions.
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- A complete testsuite that tests both the public interface and internal
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algorithms.
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- `Fuzzing`__
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.. __: https://github.com/llvm/llvm-project/tree/main/libc/fuzzing
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Platform Support
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================
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Most development is currently targeting x86_64 and aarch64 on Linux. Several
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functions in the libc have been tested on Windows. The Fuchsia platform is
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slowly replacing functions from its bundled libc with functions from this
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project.
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ABI Compatibility
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=================
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The libc is written to be ABI independent. Interfaces are generated using
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LLVM's tablegen, so supporting arbitrary ABIs is possible. In it's initial
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stages there is no ABI stability in any form.
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.. toctree::
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:hidden:
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:maxdepth: 2
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:caption: Using
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usage_modes
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overlay_mode
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fullbuild_mode
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gpu_mode
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.. toctree::
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:hidden:
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:maxdepth: 1
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:caption: Status
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compiler_support
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date_and_time
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math/index.rst
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strings
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stdio
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.. toctree::
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:hidden:
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:maxdepth: 1
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:caption: Development
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build_and_test
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dev/index.rst
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porting
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contributing
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.. toctree::
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:hidden:
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:maxdepth: 1
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:caption: External Links
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Source Code <https://github.com/llvm/llvm-project/tree/main/libc>
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Bug Reports <https://github.com/llvm/llvm-project/labels/libc>
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Discourse <https://discourse.llvm.org/c/runtimes/libc>
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Join the Discord <https://discord.gg/xS7Z362>
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Discord Channel <https://discord.com/channels/636084430946959380/636732994891284500>
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Buildbot <https://lab.llvm.org/buildbot/#/builders?tags=libc>
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