On Fri, 9 Mar 2018, Jan Kara wrote: > Hum, what is 'VLA'? Variable Length Array. They are allocated on stack and sized at runtime. Those are bad for obvious reasons and should have never been allowed in C in the first place. clang does not support them for really good reasons. > And why do we want to replace easy to understand strlen() with sizeof() > where I had to think and actually look up what the C standard says about > a sizeof(string literal). The issue is, that strlen() results in actual runtime evaluation instead of the compiler being clever and figuring out that it is a compile time constant. And runtime evaluation creates a VLA. Using sizeof() forces the compiler to evaluate it at compile time, so it's just a compile time sized array on stack. Thanks, tglx -- To unsubscribe from this list: send the line "unsubscribe reiserfs-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
