test: kernel/fatal changes for POSIX

For the POSIX arch we rely on the native OS to handle
segfaults, and stack overflows.
So that we can debug them with normal native tools.
Therefore these 2 are ifdef'ed for this arch in this test

Signed-off-by: Alberto Escolar Piedras <alpi@oticon.com>

tests/kernel/fatal/src/main.c

@@ -128,6 +128,11 @@ void testing_fatal(void)
 {
 	int expected_reason;
 
+#if defined(CONFIG_ARCH_POSIX)
+	ARG_UNUSED(expected_reason);
+	ARG_UNUSED(overflow_stack);
+#endif
+
 	rv = TC_PASS;
 
 	/*
@@ -137,6 +142,7 @@ void testing_fatal(void)
 	 */
 	k_thread_priority_set(_current, K_PRIO_PREEMPT(MAIN_PRIORITY));
 
+#ifndef CONFIG_ARCH_POSIX
 	TC_PRINT("test alt thread 1: generic CPU exception\n");
 	k_thread_create(&alt_thread, alt_stack,
 			K_THREAD_STACK_SIZEOF(alt_stack),
@@ -144,6 +150,13 @@ void testing_fatal(void)
 			NULL, NULL, NULL, K_PRIO_COOP(PRIORITY), 0,
 			K_NO_WAIT);
 	zassert_not_equal(rv, TC_FAIL, "thread was not aborted\n");
+#else
+	/*
+	 * We want the native OS to handle segfaults so we can debug it
+	 * with the normal linux tools
+	 */
+	TC_PRINT("test alt thread 1: skipped for POSIX ARCH\n");
+#endif
 
 	TC_PRINT("test alt thread 2: initiate kernel oops\n");
 	k_thread_create(&alt_thread, alt_stack,
@@ -169,6 +182,7 @@ void testing_fatal(void)
 		      crash_reason, _NANO_ERR_KERNEL_PANIC);
 	zassert_not_equal(rv, TC_FAIL, "thread was not aborted\n");
 
+#ifndef CONFIG_ARCH_POSIX
 	TC_PRINT("test stack overflow - timer irq\n");
 #ifdef CONFIG_STACK_SENTINEL
 	/* When testing stack sentinel feature, the overflow stack is a
@@ -211,6 +225,13 @@ void testing_fatal(void)
 		      crash_reason, _NANO_ERR_STACK_CHK_FAIL);
 
 	zassert_not_equal(rv, TC_FAIL, "thread was not aborted\n");
+#else
+	TC_PRINT("test stack overflow - skipped for POSIX arch\n");
+	/*
+	 * We do not have a stack check for the posix ARCH
+	 * again we relay on the native OS
+	 */
+#endif
 }
 
 /*test case main entry*/