Fix/issue 1629 auth emulator log spam

[AustinBenoit]

Description

Provide details of the change, and generalize the change in the PR title above.

Fixed log spam and high CPU utilization when offline by moving USE_AUTH_EMULATOR environment variable check to initialization and eliminating per-request logging (#1629)

---

Testing

Describe how you've tested these changes. Link any manually triggered Integration tests or CPP binary SDK Packaging Github Action workflows, if applicable.

Locally test to make sure auth emulator can still be reached. Along with making sure no env variable still talks with prod.

---

Type of Change

Place an x the applicable box:

• Bug fix. Add the issue # below if applicable.
• New feature. A non-breaking change which adds functionality.
• Other, such as a build process or documentation change.

---

Notes

• Bug fixes and feature changes require an update to the Release Notes section of release_build_files/readme.md.
• Read the contribution guidelines CONTRIBUTING.md.
• Changes to the public API require an internal API review. If you'd like to help us make Firebase APIs better, please propose your change in a feature request so that we can discuss it together.

Fixes Bugs:
#1629

[gemini-code-assist]

Code Review

This pull request refactors the Auth Emulator initialization on Desktop by moving the environment variable checks (USE_AUTH_EMULATOR and AUTH_EMULATOR_PORT) from per-request checks in AuthRequest to a one-time initialization in CreatePlatformAuth, addressing issues with log spam and high CPU utilization. The feedback suggests optimizing the environment variable lookup for AUTH_EMULATOR_PORT to avoid redundant calls to std::getenv and to handle empty port strings safely.

[github-actions]

❌  Integration test FAILED

Requested by @AustinBenoit on commit e826162
Last updated: Thu Aug 6 18:55 PDT 2026
View integration test log & download artifacts

Failures	Configs
missing_log	[TEST] [ERROR] [Android] [1/2 os: ubuntu] [android_target]
auth	[TEST] [FLAKINESS] [Android] [1/2 os: macos] [emulator_ftl_target] (1 failed tests)   FirebaseAuthTest.TestVerifyBeforeUpdatingEmail

Add flaky tests to go/fpl-cpp-flake-tracker