From 256a3a814f57d5eaf9a3dfca17a9ef8ee89d6925 Mon Sep 17 00:00:00 2001
From: Andrew Hutchings <andrew@wolfssl.com>
Date: Mon, 19 Oct 2026 13:26:31 +0100
Subject: [PATCH] Give the empty-PIN cache test hook C linkage

tests/empty_pin_cache_test.c declared WP11_Test_SetEmptyPinCheckHook
without extern "C", so the C++ debug build (cpp_debug_build) could not
link the test. Wrap it like the other test hook declarations.
---
 tests/empty_pin_cache_test.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/tests/empty_pin_cache_test.c b/tests/empty_pin_cache_test.c
index 51db8f55..dbd8c3dd 100644
--- a/tests/empty_pin_cache_test.c
+++ b/tests/empty_pin_cache_test.c
@@ -63,7 +63,13 @@
     !defined(WOLFPKCS11_LEGACY_PRIVATE_FALSE_DEFAULT)
 
 /* DEBUG_WOLFPKCS11-only test hook exported by libwolfpkcs11. */
+#ifdef __cplusplus
+extern "C" {
+#endif
 extern void WP11_Test_SetEmptyPinCheckHook(void (*hook)(void));
+#ifdef __cplusplus
+}
+#endif
 
 #define EMPTY_PIN_CACHE_TEST_DIR "./store/empty_pin_cache_test"
 #define WOLFPKCS11_TOKEN_FILENAME "wp11_token_0000000000000001"