Introduce WebRTC component build.

This CL switches all the Chromium dependencies from being direct
dependencies on WebRTC targets to a WebRTC component (which lives
at //third_party/webrtc_overrides:webrtc_component).

From now on, Chromium should never directly depend on WebRTC in
order to avoid issues explained at [1] (this will be guarded
by checkdeps and GN visibility (see [2])) but should only depend
on the WebRTC component.

This should solve a broad range of problems caused by WebRTC being
linked in different shared libraries when is_component_build=true
(from globals and singletons causing hard to debug issues, to ODR
violations and binary size increase).

[1] - https://chromium.googlesource.com/chromium/src.git/+/master/docs/component_build.md#dependencies-between-targets
[2] - https://webrtc-review.googlesource.com/c/src/+/154344

TBR: dcheng@chromium.org
Bug: webrtc:9419
Change-Id: Ice56827db1753f51592165a90c1094b468c8e188
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1874722
Commit-Queue: Mirko Bonadei <mbonadei@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Reviewed-by: Tommi <tommi@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#715450}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: cbc90fd09395613d956277e4ae33b5eeea7820d7
1 file changed
tree: 9853bd3428991e1660e2732190a6466ddcaa240c
  1. absl/
  2. CMake/
  3. abseil_clients.gni
  4. ABSEIL_ISSUE_TEMPLATE.md
  5. AUTHORS
  6. BUILD.gn
  7. CMakeLists.txt
  8. CONTRIBUTING.md
  9. LICENSE
  10. LTS.md
  11. OWNERS
  12. README.chromium
  13. README.md
  14. rename_annotations.sh
  15. UPGRADES.md
  16. WORKSPACE
README.md

Abseil - C++ Common Libraries

The repository contains the Abseil C++ library code. Abseil is an open-source collection of C++ code (compliant to C++11) designed to augment the C++ standard library.

Table of Contents

About Abseil

Abseil is an open-source collection of C++ library code designed to augment the C++ standard library. The Abseil library code is collected from Google's own C++ code base, has been extensively tested and used in production, and is the same code we depend on in our daily coding lives.

In some cases, Abseil provides pieces missing from the C++ standard; in others, Abseil provides alternatives to the standard for special needs we've found through usage in the Google code base. We denote those cases clearly within the library code we provide you.

Abseil is not meant to be a competitor to the standard library; we've just found that many of these utilities serve a purpose within our code base, and we now want to provide those resources to the C++ community as a whole.

Quickstart

If you want to just get started, make sure you at least run through the Abseil Quickstart. The Quickstart contains information about setting up your development environment, downloading the Abseil code, running tests, and getting a simple binary working.

Building Abseil

Bazel is the official build system for Abseil, which is supported on most major platforms (Linux, Windows, macOS, for example) and compilers. See the quickstart for more information on building Abseil using the Bazel build system.

If you require CMake support, please check the CMake build instructions.

Codemap

Abseil contains the following C++ library components:

  • base Abseil Fundamentals
    The base library contains initialization code and other code which all other Abseil code depends on. Code within base may not depend on any other code (other than the C++ standard library).
  • algorithm
    The algorithm library contains additions to the C++ <algorithm> library and container-based versions of such algorithms.
  • container
    The container library contains additional STL-style containers, including Abseil's unordered “Swiss table” containers.
  • debugging
    The debugging library contains code useful for enabling leak checks, and stacktrace and symbolization utilities.
  • hash
    The hash library contains the hashing framework and default hash functor implementations for hashable types in Abseil.
  • memory
    The memory library contains C++11-compatible versions of std::make_unique() and related memory management facilities.
  • meta
    The meta library contains C++11-compatible versions of type checks available within C++14 and C++17 versions of the C++ <type_traits> library.
  • numeric
    The numeric library contains C++11-compatible 128-bit integers.
  • strings
    The strings library contains a variety of strings routines and utilities, including a C++11-compatible version of the C++17 std::string_view type.
  • synchronization
    The synchronization library contains concurrency primitives (Abseil's absl::Mutex class, an alternative to std::mutex) and a variety of synchronization abstractions.
  • time
    The time library contains abstractions for computing with absolute points in time, durations of time, and formatting and parsing time within time zones.
  • types
    The types library contains non-container utility types, like a C++11-compatible version of the C++17 std::optional type.
  • utility
    The utility library contains utility and helper code.

License

The Abseil C++ library is licensed under the terms of the Apache license. See LICENSE for more information.

Links

For more information about Abseil: