modern computers sometimes make me happypic.twitter.com/xEvJF4iIVr
Yeah, I do @musllibc, FOSS & infosec stuff. But now is not the time for a mostly-/only-tech Twitter feed.
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Allocating more than PTRDIFF_MAX is UB according to clang. You do not deserve an error message or a null pointer.
This is nonsense. It's well-defined and must fail on a good implementation.
UB only occurs if, *after* the call *succeeds* (which is dependent in libc/malloc impl) you subtract pointers with diff > PTRDIFF_MAX.
If the compiler treats any other usage without such pointer subtraction as UB, the compiler is wrong and seriously buggy.
Also if the compiler assumes success of the call in order to assume a UB difference was taken, the compiler is buggy.
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