Hi, In r277146, I have connected the sanitizer libraries from compiler-rt to the build. Currently, this works for i386 and amd64, and contains Address Sanitizer (ASan) and Undefined Behavior Sanitizer.
AddressSanitizer is a fast memory error detector . It consists of a compiler instrumentation module and a run-time library. The tool can detect the following types of bugs: * Out-of-bounds accesses to heap, stack and globals * Use-after-free * Use-after-return (to some extent) * Double-free, invalid free * Memory leaks (experimental) The typical slowdown introduced by AddressSanitizer is 2x. Enable it by compiling and linking with clang, and using the -fsanitize=address flag. Undefined Behavior Sanitizer is a fast and compatible undefined behavior checker, which enables a number of checks that have small runtime cost and no impact on address space layout or ABI. Enable it by using the -fsanitize=undefined flag.  Please note that the sanitizers still have some rough edges on FreeBSD, particularly on i386. These will hopefully be smoothed out in the coming time. Reports of problems (and fixes :) are very welcome, but please log them in Bugzilla, so they can be tracked. -Dimitry  http://llvm.org/releases/3.5.0/tools/clang/docs/AddressSanitizer.html  http://llvm.org/releases/3.5.0/tools/clang/docs/UsersManual.html#opt-fsanitize-undefined
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