grpc 第三方依赖 就是grpc的 third_party 文件夹
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# Abseil in gRPC
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This document explains how to use Abseil throughout gRPC. Note that this isn't
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supposed to explain general usage of Abseil.
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## The version of Abseil
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gRPC intends to use the LTS versions of Abseil only because it simplifies
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dependency management. Abseil is being distributed via package distribution
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systems such as vcpkg and cocoapods. If gRPC depends on the certain version
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that aren't registered, gRPC in that system cannot get the right version of
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Abseil when being built, resulting in a build failure.
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Therefore, gRPC will use the LTS version only, preferably the latest one.
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## Libraries that are not ready to use
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Most of Abseil libraries are okay to use but there are some exceptions
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because they're not going well yet on some of our test machinaries or
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platforms it supports. The following is a list of targets that are NOT
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ready to use.
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- `absl/synchronization:*`: Blocked by b/186685878.
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- `absl/random`: [WIP](https://github.com/grpc/grpc/pull/23346).
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## Implemetation only
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You can use Abseil in gRPC Core and gRPC C++. But you cannot use it in
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the public interface of gRPC C++ because i) it doesn't gurantee no breaking
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API changes like gRPC C++ does and ii) it may make users change their build
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system to address Abseil.
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