On Thu, Mar 05, 2026 at 01:01:39PM -0500, Nathan Myers wrote:
> --- a/libstdc++-v3/include/std/bitset
> +++ b/libstdc++-v3/include/std/bitset
> @@ -1290,11 +1290,17 @@ _GLIBCXX_BEGIN_NAMESPACE_CONTAINER
> _GLIBCXX23_CONSTEXPR
> reference
> operator[](size_t __position)
> - { return reference(*this, __position); }
> + {
> + __glibcxx_assert(__position < _Nb);
> + return reference(*this, __position);
> + }
>
> _GLIBCXX_CONSTEXPR bool
> operator[](size_t __position) const
> - { return _Unchecked_test(__position); }
> + {
> + __glibcxx_assert(__position < _Nb);
> + return _Unchecked_test(__position);
> + }
> ///@}
>
> /**
This second change broke
In file included from
/home/jakub/src/gcc/obj16/x86_64-pc-linux-gnu/libstdc++-v3/include/bits/stdexcept_throw.h:34,
from
/home/jakub/src/gcc/obj16/x86_64-pc-linux-gnu/libstdc++-v3/include/bitset:49,
from
/home/jakub/src/gcc/gcc/testsuite/g++.old-deja/g++.martin/bitset1.C:3:
/home/jakub/src/gcc/obj16/x86_64-pc-linux-gnu/libstdc++-v3/include/bitset: In
member function 'constexpr bool std::bitset<_Nb>::operator[](std::size_t)
const':
/home/jakub/src/gcc/obj16/x86_64-pc-linux-gnu/libstdc++-v3/include/x86_64-pc-linux-gnu/bits/c++config.h:646:6:
error: compound-statement in 'constexpr' function [-Wpedantic]
/home/jakub/src/gcc/obj16/x86_64-pc-linux-gnu/libstdc++-v3/include/bitset:1301:9:
note: in expansion of macro '__glibcxx_assert'
compiler exited with status 1
FAIL: g++.old-deja/g++.martin/bitset1.C -std=c++11 (test for excess errors)
Excess errors:
/home/jakub/src/gcc/obj16/x86_64-pc-linux-gnu/libstdc++-v3/include/x86_64-pc-linux-gnu/bits/c++config.h:646:6:
error: compound-statement in 'constexpr' function [-Wpedantic]
UNRESOLVED: g++.old-deja/g++.martin/bitset1.C -std=c++11 compilation failed to
produce executable
and
In file included from
/home/jakub/src/gcc/obj16/x86_64-pc-linux-gnu/libstdc++-v3/include/bits/stl_algobase.h:59,
from
/home/jakub/src/gcc/obj16/x86_64-pc-linux-gnu/libstdc++-v3/include/algorithm:62,
from
/home/jakub/src/gcc/gcc/testsuite/g++.old-deja/g++.other/headers1.C:9:
/home/jakub/src/gcc/obj16/x86_64-pc-linux-gnu/libstdc++-v3/include/bitset: In
member function 'constexpr bool std::bitset<_Nb>::operator[](std::size_t)
const':
/home/jakub/src/gcc/obj16/x86_64-pc-linux-gnu/libstdc++-v3/include/x86_64-pc-linux-gnu/bits/c++config.h:646:6:
error: compound-statement in 'constexpr' function [-Wpedantic]
/home/jakub/src/gcc/obj16/x86_64-pc-linux-gnu/libstdc++-v3/include/bitset:1301:9:
note: in expansion of macro '__glibcxx_assert'
compiler exited with status 1
FAIL: g++.old-deja/g++.other/headers1.C -std=c++11 (test for excess errors)
Excess errors:
/home/jakub/src/gcc/obj16/x86_64-pc-linux-gnu/libstdc++-v3/include/x86_64-pc-linux-gnu/bits/c++config.h:646:6:
error: compound-statement in 'constexpr' function [-Wpedantic]
UNRESOLVED: g++.old-deja/g++.other/headers1.C -std=c++11 compilation failed to
produce executable
Perhaps the assert needs to be omitted for C++11 (C++98 is fine because the
operator isn't constexpr in that case)?
Jakub
