Fix clang warning / miscompile

breakpad/linux/generate-test-dump.cc

 // Copyright (c) 2009, Google Inc.
 // All rights reserved.
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 // notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
@@ skipping 39 matching lines @@
   sys_write(2, dump_path, my_strlen(dump_path));
   sys_write(2, "/", 1);
   sys_write(2, minidump_id, my_strlen(minidump_id));
   sys_write(2, ".dmp\n", 5);
 
   return true;
 }
 
 static void DoSomethingWhichCrashes() {
   int local_var = 1;
-  *reinterpret_cast<char*>(NULL) = 1;
+  *reinterpret_cast<volatile char*>(NULL) = 1;
 }
 
 int main() {
   google_breakpad::ExceptionHandler breakpad(".", NULL, DumpCallback, NULL,
                                              true);
   DoSomethingWhichCrashes();
   return 0;
 }