[Openmp-commits] [openmp] [OpenMP] Move KMP_CANCEL_THREADS control from preprocessor to CMake (PR #193681)

[Mark Zhuang via Openmp-commits]

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@@ -327,6 +327,16 @@ if(LIBOMP_STATS)
   set(LIBOMP_USE_STDCPPLIB TRUE)
 endif()
 
+# Thread cancellation via pthread_cancel.  Disabled on platforms that lack it
+# (Android, WASI) but can also be forced off via -DLIBOMP_USE_CANCEL_THREADS=OFF.
+if(ANDROID OR WASM)
+  set(LIBOMP_USE_CANCEL_THREADS_DEFAULT FALSE)
+else()
+  set(LIBOMP_USE_CANCEL_THREADS_DEFAULT TRUE)
+endif()
+set(LIBOMP_USE_CANCEL_THREADS "${LIBOMP_USE_CANCEL_THREADS_DEFAULT}" CACHE BOOL
+  "Enable thread cancellation via pthread_cancel?")
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zqb-all wrote:

Thanks! I kept Android/WASM hardcoded since I'm not sure if the sysroot always reflects the real runtime there, a cross-compilation sysroot may advertise pthread_cancel even when the actual target runtime lacks it. For other platforms the default now uses check_symbol_exists(pthread_cancel). Done in the follow-up patch.

https://github.com/llvm/llvm-project/pull/193681