https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102006
--- Comment #10 from Martin Sebor <msebor at gcc dot gnu.org> ---
With the reduced test case from attachment 51366 I get the same warning:
$ gcc -O2 -S -Wall -std=c++20 -xc++ ListTest.cpp.i
In constructor ‘double_iterator<T, DLink, ForwardLink,
BackwardLink>::double_iterator(single_iterator<T, ForwardLink>) [with T =
Element; DLink = quick_link; ForwardLink = forward_link<quick_link>;
BackwardLink = backward_link<quick_link>]’,
inlined from ‘quick_list<T, DLink>::iterator quick_list<T, DLink>::end()
[with T = Element; DLink = quick_link]’ at ListTest.cpp.i:66:43,
inlined from ‘void ListHolder::PrintList()’ at ListTest.cpp.i:92:73,
inlined from ‘void List_TestFunc(const TestContext&)’ at
ListTest.cpp.i:103:19:
ListTest.cpp.i:30:96: warning: array subscript 0 is outside array bounds of
‘ListHolder [1]’ [-Warray-bounds]
30 | ator<T, ForwardLink> i) : double_iterator(static_cast<DLink *>(*i)) { }
| ^
ListTest.cpp.i: In function ‘void List_TestFunc(const TestContext&)’:
ListTest.cpp.i:102:14: note: at offset -16 into object ‘holder’ of size 16
102 | ListHolder holder (context);
| ^~~~~~
