https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106771
--- Comment #4 from anlauf at gcc dot gnu.org --- (In reply to federico from comment #3) > Right: here is a version where the object is initialized: > > https://godbolt.org/z/o566cPG8P > > I also see that for the versions that compile (e.g., 11.1.0), there's a > weird SEGFAULT error at this line: > > > elemental logical function isa(this,i) > class(t), intent(in) :: this > integer, intent(in) :: i > integer :: n > n = merge(size(this%iloc),0,allocated(this%iloc)) > if (i>0 .and. i<=n) then ! Segmentation fault here > isa = this%iloc(i)>0 > else > isa = .false. > endif > end function isa > > So it at least compiles, but apparently the bug is hidden somewhere else? Well, the following might be the reason for failure: ilocs = pack(this%iloc(IDs),this%is_active(ilocs)) Here ilocs is not allocated, it is the function result. Also Intel does not like it. Replacing these lines with ilocs = pack(this%iloc(IDs),this%is_active(IDs)) makes the code run successfully for gcc versions listed under "known to work". User error?
