[ci-scan] Build break: iossimulator/tvossimulator Mono conditionvariable.c undeclared pthread_cond_timedwait_relative_np (Xcode [Content truncated due to length] #132668

Build Information

Build: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1563399
Build error leg or test failing: runtime-extra-platforms (def 154) iossimulator.arm64 Release Mono build — Build native components (mono.proj)

Error Details

The Mono runtime native build fails compiling src/native/minipal/conditionvariable.c for Apple simulator targets under Xcode 26.3.0. pthread_cond_timedwait_relative_np is no longer declared in the iPhoneSimulator SDK headers, and the build treats -Werror=implicit-function-declaration as fatal:

[169/388] Building C object mono/minipal/minipal/CMakeFiles/minipal_objects.dir/conditionvariable.c.o
FAILED: [code=1] mono/minipal/minipal/CMakeFiles/minipal_objects.dir/conditionvariable.c.o
/Users/runner/work/1/s/src/native/minipal/conditionvariable.c:115:17: error: call to undeclared function 'pthread_cond_timedwait_relative_np'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
/Users/runner/work/1/s/src/mono/mono.proj(572,5): error MSB3073: The command " cmake --build . --target install --config Release" exited with code 1.

Observed on iossimulator (and related Apple simulator legs) in runtime-extra-platforms (definition 154). Recurred across source build 1563399 and follow-up build 1563837. Related context: #119808 (Update build to use the Apple 26 SDK).

Error Message

{
  "ErrorMessage": "conditionvariable.c:115:17: error: call to undeclared function 'pthread_cond_timedwait_relative_np'",
  "ErrorPattern": "",
  "BuildRetry": false,
  "ExcludeConsoleLog": false
}

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