Comment 27 for bug 852760

-fno-builtin-strlen, but you really don't want to use that, it will penalize code way too much (then even strlen ("abc") isn't folded etc.).

Just live with valgrind false positives, any time it reports a read access
with size N as M bytes inside a block of size O alloc'd
where (M % N) == 0 && M == (O & ~(N - 1)) && O > M it is suspect you might be looking at a valgrind false positive.