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C++ Client Libraries | Google Cloud

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A number of environment variables can be used to configure the behavior of the library. There are also functions to configure this behavior in code. The environment variables are convenient when troubleshooting problems.

• GOOGLE_CLOUD_CPP_LANGUAGE_SERVICE_ENDPOINT=... overrides the EndpointOption (which defaults to "language.googleapis.com") used by MakeLanguageServiceConnection().

google::cloud::EndpointOption

GOOGLE_CLOUD_CPP_ENABLE_TRACING=rpc: turns on tracing for most gRPC calls. The library injects an additional Stub decorator that prints each gRPC request and response. Unless you have configured your own logging backend, you should also set GOOGLE_CLOUD_CPP_ENABLE_CLOG to produce any output on the program's console.

google::cloud::LoggingComponentsOptionGOOGLE_CLOUD_CPP_TRACING_OPTIONS=...: modifies the behavior of gRPC tracing, including whether messages will be output on multiple lines, or whether string/bytes fields will be truncated.

google::cloud::GrpcTracingOptionsOptionGOOGLE_CLOUD_CPP_ENABLE_CLOG=yes: turns on logging in the library, basically the library always "logs" but the logging infrastructure has no backend to actually print anything until the application sets a backend or they set this environment variable.

google::cloud::LogBackend

google::cloud::LogSink

GOOGLE_CLOUD_PROJECT=...: is used in examples and integration tests to configure the GCP project. This has no effect in the library.

Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. For details, see the Google Developers Site Policies. Java is a registered trademark of Oracle and/or its affiliates.

Last updated 2025-08-14 UTC.

[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-14 UTC."],[[["This document provides a comprehensive list of C++ library versions, ranging from the latest release candidate (2.37.0-rc) down to version 2.11.0, each with a link to its corresponding documentation."],["The library's behavior can be configured using environment variables, which are particularly helpful when debugging issues, in addition to the ability to adjust settings through in-code functions."],["The `GOOGLE_CLOUD_CPP_LANGUAGE_SERVICE_ENDPOINT` environment variable allows users to override the default endpoint used by `MakeLanguageServiceConnection()`."],["Setting `GOOGLE_CLOUD_CPP_ENABLE_TRACING=rpc` enables detailed tracing for most gRPC calls, providing insights into each request and response, in conjunction with `GOOGLE_CLOUD_CPP_ENABLE_CLOG` to output to the console."],["`GOOGLE_CLOUD_PROJECT` is used to specify a Google Cloud Platform project in examples and integration tests, although it has no impact on the library's internal operations."]]],[]]

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