This code seems to violate strict aliasing rule

[lifengxiang1025]

folly/folly/FBString.h

Lines 691 to 708 in 27f765a

	#ifndef FOLLY_SANITIZE_ADDRESS
	if ((reinterpret_cast<size_t>(data) & (sizeof(size_t) - 1)) == 0) {
	const size_t byteSize = size * sizeof(Char);
	constexpr size_t wordWidth = sizeof(size_t);
	switch ((byteSize + wordWidth - 1) / wordWidth) { // Number of words.
	case 3:
	ml_.capacity_ = reinterpret_cast<const size_t*>(data)[2];
	[[fallthrough]];
	case 2:
	ml_.size_ = reinterpret_cast<const size_t*>(data)[1];
	[[fallthrough]];
	case 1:
	ml_.data_ = *reinterpret_cast<Char**>(const_cast<Char*>(data));
	[[fallthrough]];
	case 0:
	break;
	}
	} else

This code seems to violate strict aliasing rule ml_.data_ = *reinterpret_cast<Char**>(const_cast<Char*>(data));. I think it cause compiler's undefined behavior. After I add compiler flag "-fno-strict-aliasing" there is no odd output.