gtestutils: Ensure test subprocesses don't dump core

Since we expect them to crash, let's not spam the system
core dump collection (systemd, abrt).  At the moment
systemd is not very robust against programs crashing
in loops.

Instead of aborting, we exit(1).

https://bugzilla.gnome.org/show_bug.cgi?id=700714

glib/gtestutils.c

@@ -21,6 +21,7 @@
 #include "config.h"
 
 #include "gtestutils.h"
+#include "gmessages-private.h"
 #include "gfileutils.h"
 
 #include <sys/types.h>
@@ -36,6 +37,9 @@
 #ifdef HAVE_UNISTD_H
 #include <unistd.h>
 #endif
+#ifdef HAVE_SYS_RESOURCE_H
+#include <sys/resource.h>
+#endif
 #ifdef G_OS_WIN32
 #include <io.h>
 #include <windows.h>
@@ -54,6 +58,7 @@
 #include "gslice.h"
 #include "gspawn.h"
 #include "glib-private.h"
+#include "gmessages-private.h"
 
 
 /**
@@ -759,6 +764,17 @@ parse_args (gint    *argc_p,
       else if (strcmp ("--GTestSubprocess", argv[i]) == 0)
         {
           test_in_subprocess = TRUE;
+          /* We typically expect these child processes to crash, and some
+           * tests spawn a *lot* of them.  Avoid spamming system crash
+           * collection programs such as systemd-coredump and abrt.
+           */
+#ifdef HAVE_SYS_RESOURCE_H
+          {
+            struct rlimit limit = { 0, 0 };
+            (void) setrlimit (RLIMIT_CORE, &limit);
+          }
+#endif
+          _g_log_set_exit_on_fatal ();
           argv[i] = NULL;
         }
       else if (strcmp ("-p", argv[i]) == 0 || strncmp ("-p=", argv[i], 3) == 0)
@@ -2027,7 +2043,7 @@ g_assertion_message (const char     *domain,
 
   g_test_log (G_TEST_LOG_ERROR, s, NULL, 0, NULL);
   g_free (s);
-  abort();
+  _g_log_abort ();
 }
 
 void