Add make sanitize target for AddressSanitizer leak checks

Add EXTRA variable to both Makefiles for passing extra compiler flags.
Update _s_crashes() to detect ASan-intercepted crashes (non-zero exit)
and suppress ASan noise from intentional NULL dereference tests.

1 files changed, 10 insertions, 2 deletions

diff --git a/tests/inc/test_utils.h b/tests/inc/test_utils.h
index 0cb6655..56dbb94 100644
--- a/tests/inc/test_utils.h
+++ b/tests/inc/test_utils.h
@@ -115,21 +115,29 @@ _s_check_eq_int (const char *label, int got, int expected)
 
 /* ── crash detection ──────────────────────────────────────────────── */
 
-/** Run @p fn in a child process; return 1 if it was killed by a signal. */
+/**
+ * Run @p fn in a child process; return 1 if it crashed.
+ * Detects both raw signals (SEGV, BUS) and ASan-intercepted crashes
+ * (which exit with non-zero instead of being killed by a signal).
+ */
 static int
 _s_crashes (void (*fn) (void))
 {
   pid_t pid;
   int status;
 
+  fflush (stdout);
   pid = fork ();
   if (pid == 0)
     {
+      /* Suppress ASan crash reports from intentional NULL dereferences. */
+      close (STDERR_FILENO);
       fn ();
       _exit (0);
     }
   waitpid (pid, &status, 0);
-  return (WIFSIGNALED (status));
+  return (WIFSIGNALED (status)
+          || (WIFEXITED (status) && WEXITSTATUS (status) != 0));
 }
 
 static void