kc3-lang/harfbuzz

2021-04-16T13:22:05

Avoid undefined-behavior If a struct had (because it's a union) sizeof that is larger than the null_size, we were providing only null_size bytes for its Null object. We know we'd never access beyond that, but is undefined-behavior nonetheless according to the standard. The alternative fix would have required use of flexible-arrays, which are not standard and have their own issues in various compiler. We've discussed that extensively in the follow Mozilla issue (currently locked; I've asked that it be opened): https://bugzilla.mozilla.org/show_bug.cgi?id=1577584 Part of https://github.com/harfbuzz/harfbuzz/pull/2067