[compiler-rt] tsan: Refine conditions to intercept pthread_cond_t functions (PR #154268)

[Fangrui Song via llvm-commits]

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@@ -3041,12 +3025,26 @@ void InitializeInterceptors() {
   TSAN_INTERCEPT(pthread_timedjoin_np);
   #endif
 
-  TSAN_INTERCEPT_VER(pthread_cond_init, PTHREAD_ABI_BASE);
-  TSAN_INTERCEPT_VER(pthread_cond_signal, PTHREAD_ABI_BASE);
-  TSAN_INTERCEPT_VER(pthread_cond_broadcast, PTHREAD_ABI_BASE);
-  TSAN_INTERCEPT_VER(pthread_cond_wait, PTHREAD_ABI_BASE);
-  TSAN_INTERCEPT_VER(pthread_cond_timedwait, PTHREAD_ABI_BASE);
-  TSAN_INTERCEPT_VER(pthread_cond_destroy, PTHREAD_ABI_BASE);
+  // In glibc versions older than 2.36, dlsym(RTLD_NEXT, "pthread_cond_init")
+  // may return an outdated symbol (max(2.2,base_version)) if the port was
+  // introduced before 2.3.2 (when the new pthread_cond_t was introduced).
+#if SANITIZER_GLIBC && !__GLIBC_PREREQ(2, 36) &&                      \
+    (defined(__x86_64__) || defined(__mips__) || SANITIZER_PPC64V1 || \
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MaskRay wrote:

The new pthread_cond symbols were introduced at 2.3.2. If a port (arch) was introduced after 2.3.2, the compatibility symbol (of non-default version) would not compiled, and there will only be one `pthread_cond_init` symbol, no need for `dlvsym`.

https://github.com/llvm/llvm-project/pull/154268