ASAN: trigger leak before exiting

This disables the default leak-check-on-exit behavior which reports a
bunch of leaks that are only leaks while exiting, at which point they
don’t matter, because the operating system will clean up the memory our
process used.

src/commands.c

@@ -12,6 +12,10 @@
 #include <float.h>
 #include <stdarg.h>
 
+#ifdef I3_ASAN_ENABLED
+#include <sanitizer/lsan_interface.h>
+#endif
+
 #include "all.h"
 #include "shmlog.h"
 
@@ -1658,6 +1662,9 @@ void cmd_layout_toggle(I3_CMD, const char *toggle_mode) {
  */
 void cmd_exit(I3_CMD) {
     LOG("Exiting due to user command.\n");
+#ifdef I3_ASAN_ENABLED
+    __lsan_do_leak_check();
+#endif
     ipc_shutdown();
     unlink(config.ipc_socket_path);
     xcb_disconnect(conn);