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Clang's optimizer, as of clang version 2.8 (trunk 107463), produces the undefined instruction 'ud2' for the code "*(int*)0=0" on OS X x86_64. It causes our crash tests to fail because the child process exits with an invalid instruction instead of a segmentation fault. Work around the bug by using "*(int*)1=0" in this case.
KWSys provides a platform-independent API to many common system features that are implemented differently on every platform. This library is intended to be shared among many projects, so it has a configurable namespace. Each project should configure KWSys to use a namespace unique to itself. See comments in CMakeLists.txt for details. You are probably reading this file in the source tree of a surrounding project. In that case, see "../README.kwsys" for details of using KWSys in your project.