From b328cbaadb8b8d81a6d24d4ea071a8ba98a16e00 Mon Sep 17 00:00:00 2001
From: Cristian Morales Vega <cristian@samknows.com>
Date: Sat, 16 Nov 2019 04:27:14 +0000
Subject: FindThreads: Add pthread_cancel to program to test for pthreads in
 libc

When using ThreadSanitizer our existing CMAKE_HAVE_LIBC_PTHREAD test
program links using symbols from the tsan library.  Among the symbols
not provided by that library, `pthread_cancel()` seems to be the less
risky symbol to add to the check.

Fixes: #19981
---
 Modules/FindThreads.cmake | 1 +
 1 file changed, 1 insertion(+)

(limited to 'Modules/FindThreads.cmake')

diff --git a/Modules/FindThreads.cmake b/Modules/FindThreads.cmake
index 64576ebf56..85174d93d6 100644
--- a/Modules/FindThreads.cmake
+++ b/Modules/FindThreads.cmake
@@ -63,6 +63,7 @@ int main(void)
   pthread_t thread;
   pthread_create(&thread, NULL, test_func, NULL);
   pthread_detach(thread);
+  pthread_cancel(thread);
   pthread_join(thread, NULL);
   pthread_atfork(NULL, NULL, NULL);
   pthread_exit(NULL);
-- 
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