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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/61596] -Wunused-local-typedefs warns incorrectly on a
 typedef that's referenced indirectly
Date: Mon, 24 Jan 2022 12:29:19 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D61596

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|2014-06-26 00:00:00         |2022-1-24

--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> ---
This now warns about libstdc++ code, see PR 104019:

/build/trunk/x86_64-unknown-dragonfly6.3/libstdc++-v3/include/bits/shared_p=
tr_base.h:
In member function 'void std::_Sp_counted_array_base<_Alloc>::_M_init(typen=
ame
std::allocator_traits<_Alloc>::value_type*, _Init)':
/build/trunk/x86_64-unknown-dragonfly6.3/libstdc++-v3/include/bits/shared_p=
tr_base.h:767:
warning: typedef 'using value_type =3D using _Up =3D typename
std::allocator_traits<_Alloc>::value_type' locally defined but not used
[-Wunused-local-typedefs]
/build/trunk/x86_64-unknown-dragonfly6.3/libstdc++-v3/include/bits/shared_p=
tr_base.h:768:
warning: typedef 'using difference_type =3D std::ptrdiff_t' locally defined=
 but
not used [-Wunused-local-typedefs]
/build/trunk/x86_64-unknown-dragonfly6.3/libstdc++-v3/include/bits/shared_p=
tr_base.h:771:
warning: typedef 'using iterator_category =3D struct std::forward_iterator_=
tag'
locally defined but not used [-Wunused-local-typedefs]
In file included from
/build/trunk/x86_64-unknown-dragonfly6.3/libstdc++-v3/include/x86_64-unknow=
n-dragonfly6.3/bits/stdc++.h:144:

Those typedefs are 100% necessary because otherwise the local class is not a
valid iterator type.=