From e7aad1ac22b2902d46f94dc949794f5bbebec374 Mon Sep 17 00:00:00 2001
From: David Garske <david@wolfssl.com>
Date: Fri, 2 May 2025 12:48:24 -0700
Subject: [PATCH] Support for pthread static mutex when building against older
 wolfSSL versions (like 5.6.6).

---
 wolftpm/tpm2_types.h | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/wolftpm/tpm2_types.h b/wolftpm/tpm2_types.h
index d7f4ccd..678e172 100644
--- a/wolftpm/tpm2_types.h
+++ b/wolftpm/tpm2_types.h
@@ -234,6 +234,20 @@ typedef int64_t  INT64;
     #endif
 #endif
 
+/* if using older wolfSSL that does not have the pthread mutex initializer */
+#ifndef WOLFSSL_MUTEX_INITIALIZER
+    #if defined(WOLFSSL_PTHREADS)
+        #define WOLFSSL_MUTEX_INITIALIZER PTHREAD_MUTEX_INITIALIZER
+    #endif
+#endif
+#ifndef WOLFSSL_MUTEX_INITIALIZER_CLAUSE
+    #ifdef WOLFSSL_MUTEX_INITIALIZER
+        #define WOLFSSL_MUTEX_INITIALIZER_CLAUSE(lockname) = WOLFSSL_MUTEX_INITIALIZER
+    #else
+        #define WOLFSSL_MUTEX_INITIALIZER_CLAUSE(lockname) /* null expansion */
+    #endif
+#endif
+
 #ifndef WOLFTPM_CUSTOM_TYPES
     #include <stdlib.h>