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Showing content from https://cloud.google.com/cpp/docs/reference/language/2.24.0/language-env below:

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::TracingComponentsOptionGOOGLE_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 version-specific documentation for the C++ language library, with the latest release candidate being version 2.37.0-rc and the current version at 2.24.0."],["Environment variables, such as `GOOGLE_CLOUD_CPP_LANGUAGE_SERVICE_ENDPOINT`, `GOOGLE_CLOUD_CPP_ENABLE_TRACING`, and `GOOGLE_CLOUD_CPP_ENABLE_CLOG`, can be used to configure various behaviors, including endpoint overrides and logging for troubleshooting."],["The library supports gRPC tracing through `GOOGLE_CLOUD_CPP_ENABLE_TRACING`, which allows for the printing of gRPC requests and responses, and further customization is available with `GOOGLE_CLOUD_CPP_TRACING_OPTIONS`."],["Logging in the library is enabled via `GOOGLE_CLOUD_CPP_ENABLE_CLOG`, which directs output to the program's console when set, but without it the library will still log but without any output displayed."],["`GOOGLE_CLOUD_PROJECT` will allow you to set the default project to be used for examples and integration tests, though it has no actual effect on the library itself."]]],[]]

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