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91 lines
4.2 KiB
91 lines
4.2 KiB
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LLVM parallel-libs Subproject Charter
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Description
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The LLVM open source project will contain a subproject named `parallel-libs`
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which will host the development of libraries which are aimed at enabling
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parallelism in code and which are also closely tied to compiler technology.
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Examples of libraries suitable for hosting within the `parallel-libs`
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subproject are runtime libraries and parallel math libraries. The initial
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candidates for inclusion in this subproject are **StreamExecutor** and
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**libomptarget** which would live in the `streamexecutor` and `libomptarget`
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subdirectories of `parallel-libs`, respectively.
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The `parallel-libs` project will host a collection of libraries where each
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library may be dependent on other libraries from the project or may be
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completely independent of any other libraries in the project. The rationale for
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hosting independent libraries within the same subproject is that all libraries
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in the project are providing related functionality that lives at the
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intersection of parallelism and compiler technology. It is expected that some
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libraries which initially began as independent will develop dependencies over
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time either between existing libraries or by extracting common code that can be
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used by each. One of the purposes of this subproject is to provide a working
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space where such refactoring and code sharing can take place.
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Libraries in the `parallel-libs` subproject may also depend on the LLVM core
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libraries. This will be useful for avoiding duplication of code within the LLVM
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project for common utilities such as those found in the LLVM support library.
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Requirements
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Libraries included in the `parallel-libs` subproject must strive to achieve the
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following requirements:
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1. Adhere to the LLVM coding standards.
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2. Use the LLVM build and test infrastructure.
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3. Be released under LLVM's license.
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Coding standards
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----------------
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Libraries in `parallel-libs` will match the LLVM coding standards. For existing
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projects being checked into the subproject as-is, an exception will be made
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during the initial check-in, with the understanding that the code will be
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promptly updated to follow the standards. Therefore, a three month grace period
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will be allowed for new libraries to meet the LLVM coding standards.
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Additional exceptions to strict adherence to the LLVM coding standards may be
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allowed in certain other cases, but the reasons for such exceptions must be
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discussed and documented on a case-by-case basis.
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LLVM build and test infrastructure
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----------------------------------
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Using the LLVM build and test infrastructure currently means using `cmake` for
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building, `lit` for testing, and `buildbot` for automating build and testing.
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This project will follow the main LLVM project conventions here and track them
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as they evolve.
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Each subproject library will be able to build separately without a single,
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unified cmake file, but each subproject libraries will also be integrated into
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the LLVM build so they can be built directly from the top level of the LLVM
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cmake infrastructure.
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LLVM license
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------------
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For simplicity, the `parallel-libs` project will use the normal LLVM license.
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While some runtime libraries use a dual license scheme in LLVM, we anticipate
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the project removing the need for this eventually and in the interim follow the
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simpler but still permissive license. Among other things, this makes it
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straightforward for these libraries to re-use core LLVM libraries where
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appropriate.
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Mailing List and Bugs
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Two mailing lists will be set up for the project:
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1. parallel_libs-dev@lists.llvm.org for discussions among project developers, and
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2. parallel_libs-commits@lists.llvm.org for patches and commits to the project.
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Each subproject library will manage its own components in Bugzilla. So, for
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example, there can be several Bugzilla components for different parts of
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StreamExecutor, etc.
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