On Mon, Mar 9, 2026 at 12:04 PM Tomasz Kaminski <[email protected]> wrote:
> I believe, this caused failure > 21_strings/basic_string/requirements/dr438/constructor.c in C++20 mode:: > In file included from > /home/tkaminsk/build/gcc/16/x86_64-pc-linux-gnu/libstdc++-v3/include/debug/functions.h:39, > from > /home/tkaminsk/build/gcc/16/x86_64-pc-linux-gnu/libstdc++-v3/include/debug/safe_sequence.h:34, > from > /home/tkaminsk/build/gcc/16/x86_64-pc-linux-gnu/libstdc++-v3/include/debug/string:37, > from > /home/tkaminsk/src/gcc/libstdc++-v3/testsuite/21_strings/basic_string/requirements/dr438/constructor.cc:23: > /home/tkaminsk/build/gcc/16/x86_64-pc-linux-gnu/libstdc++-v3/include/debug/helper_functions.h: > In instantiation of 'constexpr bool > __gnu_debug::__valid_range(_InputIterator, _InputIterator) [with > _InputIterator = int]': > The full test suite showed 705 failures for _GLIBCXX_DEBUG=1 run, and every one I checked has the same error. They may be other, but are very hard to find. They are mostly point toward basic_regexp or basic_string. See the attachment for the full list. (The workaround seems far for useless currently). > /home/tkaminsk/build/gcc/16/x86_64-pc-linux-gnu/libstdc++-v3/include/debug/functions.h:65: > required from 'constexpr _InputIterator > __gnu_debug::__check_valid_range(const _InputIterator&, const > _InputIterator&, const char*, unsigned int, const char*) [with > _InputIterator = int]' > /home/tkaminsk/build/gcc/16/x86_64-pc-linux-gnu/libstdc++-v3/include/debug/string:238: > required from '__gnu_debug::basic_string<_CharT, _Traits, > _Allocator>::basic_string(_InputIterator, _InputIterator, const > _Allocator&) [with _InputIterator = int; _CharT = char; _Traits = > std::char_traits<char>; _Allocator = std::allocator<char>]' > /home/tkaminsk/src/gcc/libstdc++-v3/testsuite/21_strings/basic_string/requirements/dr438/constructor.cc:28: > required from here > /home/tkaminsk/build/gcc/16/x86_64-pc-linux-gnu/libstdc++-v3/include/debug/helper_functions.h:212: > error: no matching function for call to '__iterator_category(int&)' > /home/tkaminsk/build/gcc/16/x86_64-pc-linux-gnu/libstdc++-v3/include/debug/helper_functions.h:212: > note: there is 1 candidate > In file included from > /home/tkaminsk/build/gcc/16/x86_64-pc-linux-gnu/libstdc++-v3/include/bits/stl_construct.h:61, > from > /home/tkaminsk/build/gcc/16/x86_64-pc-linux-gnu/libstdc++-v3/include/bits/char_traits.h:59, > from > /home/tkaminsk/build/gcc/16/x86_64-pc-linux-gnu/libstdc++-v3/include/string:45, > from > /home/tkaminsk/src/gcc/libstdc++-v3/testsuite/21_strings/basic_string/requirements/dr438/constructor.cc:22: > /home/tkaminsk/build/gcc/16/x86_64-pc-linux-gnu/libstdc++-v3/include/bits/stl_iterator_base_types.h:241: > note: candidate 1: 'template<class _Iter> constexpr typename > std::iterator_traits<_Iterator>::iterator_category > std::__iterator_category(const _Iter&)' > /home/tkaminsk/build/gcc/16/x86_64-pc-linux-gnu/libstdc++-v3/include/bits/stl_iterator_base_types.h:241: > note: template argument deduction/substitution failed: > /home/tkaminsk/build/gcc/16/x86_64-pc-linux-gnu/libstdc++-v3/include/bits/stl_iterator_base_types.h: > In substitution of 'template<class _Iter> constexpr typename > std::iterator_traits<_Iterator>::iterator_category > std::__iterator_category(const _Iter&) [with _Iter = int]': > /home/tkaminsk/build/gcc/16/x86_64-pc-linux-gnu/libstdc++-v3/include/debug/helper_functions.h:212: > required from 'constexpr bool __gnu_debug::__valid_range(_InputIterator, > _InputIterator) [with _InputIterator = int]' > /home/tkaminsk/build/gcc/16/x86_64-pc-linux-gnu/libstdc++-v3/include/debug/functions.h:65: > required from 'constexpr _InputIterator > __gnu_debug::__check_valid_range(const _InputIterator&, const > _InputIterator&, const char*, unsigned int, const char*) [with > _InputIterator = int]' > /home/tkaminsk/build/gcc/16/x86_64-pc-linux-gnu/libstdc++-v3/include/debug/string:238: > required from '__gnu_debug::basic_string<_CharT, _Traits, > _Allocator>::basic_string(_InputIterator, _InputIterator, const > _Allocator&) [with _InputIterator = int; _CharT = char; _Traits = > std::char_traits<char>; _Allocator = std::allocator<char>]' > /home/tkaminsk/src/gcc/libstdc++-v3/testsuite/21_strings/basic_string/requirements/dr438/constructor.cc:28: > required from here > /home/tkaminsk/build/gcc/16/x86_64-pc-linux-gnu/libstdc++-v3/include/bits/stl_iterator_base_types.h:241: > error: no type named 'iterator_category' in 'struct > std::iterator_traits<int>' > compiler exited with status 1 > FAIL: 21_strings/basic_string/requirements/dr438/constructor.cc > -std=gnu++20 (test for excess errors) > Excess errors: > /home/tkaminsk/build/gcc/16/x86_64-pc-linux-gnu/libstdc++-v3/include/debug/helper_functions.h:212: > error: no matching function for call to '__iterator_category(int&)' > /home/tkaminsk/build/gcc/16/x86_64-pc-linux-gnu/libstdc++-v3/include/bits/stl_iterator_base_types.h:241: > error: no type named 'iterator_category' in 'struct > std::iterator_traits<int>' > > > On Mon, Mar 2, 2026 at 7:00 AM François Dumont <[email protected]> > wrote: > >> Hi >> >> libstdc++: [_GLIBCXX_DEBUG][__cplusplus >= 201103L] Remove useless >> workaround >> >> Starting with C++11 we leverage on template parameter requirement >> to prevent >> instantiation of methods taking iterators with invalid types. >> So the _GLIBCXX_DEBUG mode do not need to check for potential >> ambiguity between >> integer type and iterator type anymore. >> >> libstdc++-v3/ChangeLog: >> >> * include/debug/functions.h >> [__cplusplus >= 201103L](__foreign_iterator_aux): Remove. >> [__cplusplus >= 201103L](__foreign_iterator): Adapt to use >> __foreign_iterator_aux2. >> * include/debug/helper_functions.h >> [__cplusplus >= 201103L]: Remove include >> bits/cpp_type_traits.h. >> [__cplusplus >= 201103L](_Distance_traits<_Integral, >> std::__true_type>): Remove. >> [__cplusplus >= 201103L](__valid_range_aux(_Integral, >> _Integral, std::__true_type)): >> Remove. >> [__cplusplus >= 201103L](__valid_range_aux(_Iterator, >> _Iterator, std::__false_type)): >> Remove. >> [__cplusplus >= 201103L] >> (__valid_range_aux(_Integral, _Integral, >> _Distance_traits<_Integral>::__type&, >> std::__true_type)): Remove. >> [__cplusplus >= 201103L] >> (__valid_range_aux(_Iterator, _Iterator, >> _Distance_traits<_Iterator>::__type&, >> std::__false_type)): Remove. >> [__cplusplus >= 201103L](__valid_range(_Iterator, >> _Iterator)): Adapt. >> [__cplusplus >= 201103L] >> (__valid_range(_Iterator, _Iterator, >> _Distance_traits<_Iterator>::__type&)): Adapt. >> >> Tested under Linux x64 _GLIBCXX_DEBUG mode. >> >> Ok to commit ? >> >> François >> >>
fail
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