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C++ Client Libraries | Google Cloud

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Environment Variables

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.

Endpoint Overrides See Also

google::cloud::EndpointOption

Logging

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.

See Also

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.

See Also

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.

See Also

google::cloud::LogBackend

See Also

google::cloud::LogSink

Setting the Default Project

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

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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."],[[["The latest version available is 2.37.0-rc, with numerous previous versions from 2.36.0 down to 2.12.0 also available for reference."],["A range of environment variables, such as `GOOGLE_CLOUD_CPP_DATASET_SERVICE_ENDPOINT`, `GOOGLE_CLOUD_CPP_DEPLOYMENT_RESOURCE_POOL_SERVICE_ENDPOINT`, and many others, can override the default `EndpointOption` to configure the behavior of the library."],["The `GOOGLE_CLOUD_CPP_ENABLE_TRACING=rpc` environment variable can be used to turn on gRPC call tracing, and `GOOGLE_CLOUD_CPP_ENABLE_CLOG` should also be set to produce output to the program's console if you don't already have a logging backend."],["`GOOGLE_CLOUD_CPP_ENABLE_CLOG=yes` can turn on logging in the library, and the `GOOGLE_CLOUD_CPP_TRACING_OPTIONS=...` variable can adjust the behavior of gRPC tracing."],["The `GOOGLE_CLOUD_PROJECT=...` variable is used in examples and integration testing, but has no effect when used with the library itself."]]],[]]

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