Merge pull request #62110 from mhjacobson/freebsd-fix-stack-bounds-accessor

Threading: fix the FreeBSD build

Author: al45tair

lib/Threading/Pthreads.cpp

@@ -101,18 +101,26 @@ swift::threading_impl::thread_get_current_stack_bounds() {
 #if defined(__FreeBSD__)
   if (pthread_attr_init(&attr))
     return {};
-#endif
 
-  if (!pthread_getattr_np(pthread_self(), &attr)) {
-    if (!pthread_attr_getstack(&attr, &begin, &size)) {
-      stack_bounds result = { begin, (char *)begin + size };
-      pthread_attr_destroy(&attr);
-      return result;
-    }
+  if (pthread_attr_get_np(pthread_self(), &attr)) {
+    pthread_attr_destroy(&attr);
+    return {};
+  }
+#elif defined(__linux__)
+  if (pthread_getattr_np(pthread_self(), &attr))
+    return {};
+#else
+  // We don't know how to get the thread attr for this platform.
+  return {};
+#endif
 
+  if (!pthread_attr_getstack(&attr, &begin, &size)) {
+    stack_bounds result = { begin, (char *)begin + size };
     pthread_attr_destroy(&attr);
+    return result;
   }
 
+  pthread_attr_destroy(&attr);
   return {};
 }
 #endif