https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101836
--- Comment #35 from qinzhao at gcc dot gnu.org --- (In reply to James Y Knight from comment #33) > > I don't understand what the -Wstrict-flex-arrays warning and its multiple > levels is proposed to actually do. > > Is it supposed to warn on the structs that change behavior in the > corresponding -fstrict-flex-array=LEVEL? But that would mean > -Wstrict-flex-arrays=1 would warn on any array at the end of a struct which > has a size other than 0 or 1. That's clearly not going to be actually > practical...so perhaps you had something else in mind? I think that -Wstrict-flex-arrays will need to be cooperated with -fstrict-flex-arrays=N, i.e, only when -fstrict-flex-arrays=N is presenting, -Wstrict-flex-arrays will be valid and report the warnings when see a [0], or [1], or any trailing array based on N: when -fstrict-flex-arrays =0, -Wstrict-flex-arrays will NOT issue any warnings; =1, -Wstrict-flex-arrays will issue warnings when an array ref's index is larger than the upper bounds of a trailing array that is a regular trailing array; =2, -Wstrict-flex-arrays will issue warnings when an array ref's index is larger than the upper bounds of a trailing array that is a regular trailing array or [1]; =3, -Wstrict-flex-arrays will issue warnings when an array ref's index is larger than the upper bounds of a trailing array that is a regular trailing array or [1], or [0]. let me know if you have any comment and suggestion on this.
