text: // RUN: %clang_tsan -O1 %s -o %t && %t 2>&1 | FileCheck %s
  #include <pthread.h>
  int Global;
  void *Thread1(void *x) {
    Global = 42;
    return x;
  }
  int main() {
    pthread_t t;
    pthread_create(&t, NULL, Thread1, NULL);
    Global = 43;
    pthread_join(t, NULL);
    return Global;
  }
  // CHECK: WARNING: ThreadSanitizer: data race
  