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* poison: added valgrind supportMax Kellermann2009-03-091-0/+14
| | | | | | If the header valgrind/memcheck.h is available, add VALGRIND_MAKE_MEM_NOACCESS() and VALGRIND_MAKE_MEM_UNDEFINED() support, which enables nice warnings in the valgrind memory checker.
* added memory poisoning libraryMax Kellermann2009-03-091-0/+61
Memory poisoning is useful for marking memory regions as "undefined". This poisoning only enabled in the debug build (!NDEBUG).