tests/kernel: Add test for constructors in C

Make sure constructors are run even when not using C++.

Signed-off-by: Keith Packard <[email protected]>

tests/kernel/common/CMakeLists.txt

@@ -14,6 +14,7 @@ target_sources(app PRIVATE
 	src/bitarray.c
 	src/byteorder.c
 	src/clock.c
+	src/constructor.c
 	src/main.c
 	src/timeout_order.c
 	src/multilib.c

tests/kernel/common/src/constructor.c

@@ -0,0 +1,43 @@
+/*
+ * Copyright (c) 2024 Keith Packard
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <zephyr/kernel.h>
+#include <errno.h>
+#include <zephyr/tc_util.h>
+#include <zephyr/ztest.h>
+/**
+ * @addtogroup kernel_common_tests
+ * @{
+ */
+
+/**
+ * @brief Test if constructors work
+ *
+ */
+
+static int constructor_value;
+
+#define CONSTRUCTOR_VALUE	1
+
+void
+__attribute__((__constructor__))
+__constructor_init(void)
+{
+	constructor_value = CONSTRUCTOR_VALUE;
+}
+
+ZTEST(constructor, test_constructor)
+{
+	zassert_equal(constructor_value, CONSTRUCTOR_VALUE,
+		      "constructor test failed: constructor not called");
+}
+
+extern void *common_setup(void);
+ZTEST_SUITE(constructor, NULL, common_setup, NULL, NULL, NULL);
+
+/**
+ * @}
+ */