abort-debug: Don't assume that signal SIGABRT is unmasked and unhandled

[Bruno Haible]

Reading the man page of abort(), I see that it deals with situations
where SIGABRT is masked (via sigprocmask) or has a handler installed.
The override needs to have the same behaviour.


2024-07-18  Bruno Haible  <br...@clisp.org>

        abort-debug: Don't assume that signal SIGABRT is unmasked and unhandled.
        * lib/abort-debug.c (rpl_abort): At the end, call the original abort
        function.

diff --git a/lib/abort-debug.c b/lib/abort-debug.c
index 2457ef07c2..cb78c44dc0 100644
--- a/lib/abort-debug.c
+++ b/lib/abort-debug.c
@@ -26,13 +26,14 @@
 /*   rpl_abort ();
    is equivalent to
      print_stack_trace ();
-     original abort (); // i.e. raise (SIGABRT);
+     original abort (); // essentially raise (SIGABRT);
  */
 void
 rpl_abort (void)
+#undef abort
 {
 #if HAVE_LIBBACKTRACE || HAVE_LIBASAN || HAVE_EXECINFO_H
   print_stack_trace_to (stderr);
 #endif
-  raise (SIGABRT);
+  abort ();
 }