[ci-scan] Build break: minipal/thread.c undeclared pthread_threadid_np on Apple mono build #132391

Build Information

Build: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1554343
Build error leg or test failing: iossimulator-arm64 Release AllSubsets_Mono - Build product (mono.proj cmake install)

Error Details

The mono runtime build on Apple targets (iossimulator-arm64 AllSubsets_Mono, and other Apple legs) in runtime-extra-platforms (definition 154) fails to compile src/native/minipal/thread.c. The pthread functions pthread_threadid_np / pthread_setname_np are used without a declaration in scope, and under -Werror the implicit-function-declaration diagnostic breaks the build:

/Users/runner/work/1/s/src/native/minipal/thread.c:56:5: error: call to undeclared function 'pthread_threadid_np'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
/Users/runner/work/1/s/src/native/minipal/thread.c:100:12: error: call to undeclared function 'pthread_setname_np'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
##[error]src/mono/mono.proj(572,5): error MSB3073: The command " cmake --build . --target install --config Release" exited with code 1.
Build FAILED.

This is a hard build break: the leg fails during native build before any Helix work is sent. It first appeared in build 1553120 (finished 2026-08-14T07:19Z); the prior build 1551332 (2026-08-13) did not have this build-product failure. It reproduces in every subsequent build including the follow-up build 1554672.

Error Message

{
  "ErrorMessage": "thread.c:56:5: error: call to undeclared function 'pthread_threadid_np'",
  "ErrorPattern": "",
  "BuildRetry": false,
  "ExcludeConsoleLog": false
}

Filed by ci-failure-scan (detection only). ci-failure-fix walks open [ci-scan] KBEs and either opens a small fix PR or comments here to loop in owners - it never disables the test.

Generated by CI Outer-Loop Failure Scanner · opus48 · 684.1 AIC · ⌖ 19.2 AIC · ⊞ 20.5K · ◷

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