https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81141
Eric Gallager <egallager at gcc dot gnu.org> changed:
What |Removed |Added
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CC| |egallager at gcc dot gnu.org
--- Comment #6 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Martin Sebor from comment #0)
> GCC detects the common mistake of using the (sizeof P / sizeof *P)
> expression to attempt to compute the length of an array when P is a pointer.
> A similar mistake is using the same expression when P is a zero-length
> array because the result is zero, or a one-element array as the last element
> of a struct because such an array is often used as a substitute for a
> flexible array member. This is a enhancement request to add such a warning
> (either under -Wsizeof-pointer-div or under a new option).
What about -Wsizeof-array-div or -Wzero-length-bounds?
(In reply to Martin Sebor from comment #0)
> If this enhancement should be made available under a new warning option,
> since the programming error it detects boils down to essentially the same
> problem with the same conseequence, I would suggest to have the new option
> subsume the -Wsizeof-pointer-div functionality as well. A possible name for
> the new option might be -Wsizeof-division: "warn about uses of sizeof that
> appear as if they attempt to compute the size of an array but do not
> actually do so, or that may yield the wrong number of elements."
How about -Wsizeof-division as an umbrella flag that enables both
-Wsizeof-pointer-div and -Wsizeof-array-div?
