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
GOOGLE_CLOUD_CPP_TEXT_TO_SPEECH_ENDPOINT=... overrides the EndpointOption (which defaults to "texttospeech.googleapis.com") used by MakeTextToSpeechConnection().
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.
[[["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 2025-04-17 UTC."],[[["This webpage provides documentation for the C++ Text-to-Speech library, with a focus on its different version releases, including the latest release candidate, 2.37.0-rc."],["The content outlines the available versions of the Text-to-Speech library, ranging from version 2.11.0 to the latest release candidate version 2.37.0-rc, providing links to the documentation for each version."],["The documentation details environment variables that can be used to configure the library's behavior, like endpoint overrides, logging settings, and the default project setting."],["The documentation also provides links to the relevant google cloud documentation, including `EndpointOption`, `LoggingComponentsOption`, `GrpcTracingOptionsOption`, `LogBackend`, and `LogSink`."],["`GOOGLE_CLOUD_CPP_ENABLE_CLOG=yes` can be used to turn on logging within the library."]]],[]]
