Prerequisite should be non existence of a #define (rather than existence of
#undef in the comments).
git-svn-id: svn://svn.valgrind.org/valgrind/trunk@13192
The flag DISABLE_PTHREAD_SPINLOCK_INTERCEPT is set only for MIPS32, and it is
used in DRD and Helgrind as a workaround for the issue #311690.
In short, pthread_spin_lock implementation has local branches to the start of
the function which interferes with the redirection system in Valgrind that
assumes it has to redirect each call/branch to a particular address.
git-svn-id: svn://svn.valgrind.org/valgrind/trunk@13190
