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 document outlines various versions of the Text-to-Speech C++ library, with version 2.37.0-rc as the latest release candidate and versions dating back to 2.11.0 being accessible."],["Environment variables can be utilized to customize the library's behavior, particularly useful for debugging, with options to modify the endpoint, enable gRPC call tracing, and turn on logging."],["The `GOOGLE_CLOUD_CPP_TEXT_TO_SPEECH_ENDPOINT` environment variable allows overriding the default endpoint used by the `MakeTextToSpeechConnection()` function."],["Logging can be enabled using `GOOGLE_CLOUD_CPP_ENABLE_TRACING=rpc` for gRPC call tracing and `GOOGLE_CLOUD_CPP_ENABLE_CLOG=yes` to ensure logs are printed to the console."],["The `GOOGLE_CLOUD_PROJECT` variable can be set to identify the project but does not have any effect within the library itself."]]],[]]
