improve clang / cmocka integration

(cherry picked from commit cb913177)

lib/dns/tests/result_test.c

@@ -15,6 +15,7 @@
 
 #include <stdarg.h>
 #include <stddef.h>
+#include <stdlib.h>
 #include <setjmp.h>
 #include <string.h>
 

lib/isc/include/isc/util.h

@@ -220,15 +220,26 @@
 #ifdef UNIT_TESTING
 extern void mock_assert(const int result, const char* const expression,
 			const char * const file, const int line);
+/*
+ *	Allow clang to determine that the following code is not reached
+ *	by calling abort() if the condition fails.  The abort() will
+ *	never be executed as mock_assert() and _assert_true() longjmp
+ *	or exit if the condition is false.
+ */
 #define REQUIRE(expression)						\
-	mock_assert((int)(expression), #expression, __FILE__, __LINE__)
+	((!(expression)) ?						\
+	(mock_assert(0, #expression, __FILE__, __LINE__), abort()) : (void)0)
 #define ENSURE(expression)						\
-	mock_assert((int)(expression), #expression, __FILE__, __LINE__)
+	((!(int)(expression)) ?						\
+	(mock_assert(0, #expression, __FILE__, __LINE__), abort()) : (void)0)
 #define INSIST(expression)						\
-	mock_assert((int)(expression), #expression, __FILE__, __LINE__)
+	((!(expression)) ?						\
+	(mock_assert(0, #expression, __FILE__, __LINE__), abort()) : (void)0)
 #define INVARIANT(expression)						\
-	mock_assert((int)(expression), #expression, __FILE__, __LINE__)
-
+	((!(expression)) ?						\
+	(mock_assert(0, #expression, __FILE__, __LINE__), abort()) : (void)0)
+#define _assert_true(c, e, f, l) \
+	((c) ? (void)0 : (_assert_true(0, e, f, l), abort()))
 #else /* UNIT_TESTING */
 /*
  * Assertions

lib/isc/inet_ntop.c

@@ -16,6 +16,7 @@
 #include <errno.h>
 #include <stdio.h>
 #include <inttypes.h>
+#include <stdlib.h>
 #include <string.h>
 
 #include <isc/net.h>

lib/isc/tests/inet_ntop_test.c

@@ -16,6 +16,7 @@
 #include <stdarg.h>
 #include <stddef.h>
 #include <setjmp.h>
+#include <stdlib.h>
 #include <string.h>
 
 #define UNIT_TESTING

lib/isc/tests/netaddr_test.c

@@ -15,6 +15,7 @@
 
 #include <stdarg.h>
 #include <stddef.h>
+#include <stdlib.h>
 #include <setjmp.h>
 
 #include <stdbool.h>

lib/isc/tests/result_test.c

@@ -15,6 +15,7 @@
 
 #include <stdarg.h>
 #include <stddef.h>
+#include <stdlib.h>
 #include <setjmp.h>
 #include <string.h>
 

lib/isccc/tests/result_test.c

@@ -15,6 +15,7 @@
 
 #include <stdarg.h>
 #include <stddef.h>
+#include <stdlib.h>
 #include <setjmp.h>
 #include <string.h>