[llvm-bugs] [Bug 44955] New: clang++ 10.0 fails with libstdc++ from gcc 10-20200216

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=44955

            Bug ID: 44955
           Summary: clang++ 10.0 fails with libstdc++ from gcc 10-20200216
           Product: new-bugs
           Version: 10.0
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: bero at lindev.ch
                CC: htmldeveloper at gmail.com, llvm-bugs at lists.llvm.org

Not 100% sure whether this is a libstdc++ bug or a clang bug. (Also filed a bug
report against libstdc++ at
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93818).

Using libstdc++ from gcc 10-20200216 breaks using it with clang 10 in C++20
mode.

/usr/bin/../lib64/gcc/x86_64-openmandriva-linux-gnu/10.0.0/../../../../include/c++/10.0.0/ranges:1329:17:
error: missing 'typename' prior to dependent type name
'iterator_traits<iterator_t<_Vp> >::iterator_category'
          using _Cat = iterator_traits<iterator_t<_Vp>>::iterator_category;
                       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/bin/../lib64/gcc/x86_64-openmandriva-linux-gnu/10.0.0/../../../../include/c++/10.0.0/ranges:1512:47:
error: ambiguous deduction for template arguments of '_RangeAdaptor'
    inline constexpr __adaptor::_RangeAdaptor filter
                                              ^
/usr/bin/../lib64/gcc/x86_64-openmandriva-linux-gnu/10.0.0/../../../../include/c++/10.0.0/ranges:1073:2:
note: candidate function [with _Callable = std::ranges::views::(lambda at
/usr/bin/../lib64/gcc/x86_64-openmandriva-linux-gnu/10.0.0/../../../../include/c++/10.0.0/ranges:1513:9)]
        _RangeAdaptor(const _Callable& = {})
        ^
/usr/bin/../lib64/gcc/x86_64-openmandriva-linux-gnu/10.0.0/../../../../include/c++/10.0.0/ranges:1078:2:
note: candidate function [with _Callable = std::ranges::views::(lambda at
/usr/bin/../lib64/gcc/x86_64-openmandriva-linux-gnu/10.0.0/../../../../include/c++/10.0.0/ranges:1513:9)]
        _RangeAdaptor(_Callable __callable)
        ^
/usr/bin/../lib64/gcc/x86_64-openmandriva-linux-gnu/10.0.0/../../../../include/c++/10.0.0/ranges:1552:19:
error: missing 'typename' prior to dependent type name
'iterator_traits<iterator_t<_Base> >::iterator_category'
            using _Cat = iterator_traits<iterator_t<_Base>>::iterator_category;
                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/bin/../lib64/gcc/x86_64-openmandriva-linux-gnu/10.0.0/../../../../include/c++/10.0.0/ranges:1853:47:
error: ambiguous deduction for template arguments of '_RangeAdaptor'
    inline constexpr __adaptor::_RangeAdaptor transform
                                              ^
/usr/bin/../lib64/gcc/x86_64-openmandriva-linux-gnu/10.0.0/../../../../include/c++/10.0.0/ranges:1073:2:
note: candidate function [with _Callable = std::ranges::views::(lambda at
/usr/bin/../lib64/gcc/x86_64-openmandriva-linux-gnu/10.0.0/../../../../include/c++/10.0.0/ranges:1854:9)]
        _RangeAdaptor(const _Callable& = {})
        ^
/usr/bin/../lib64/gcc/x86_64-openmandriva-linux-gnu/10.0.0/../../../../include/c++/10.0.0/ranges:1078:2:
note: candidate function [with _Callable = std::ranges::views::(lambda at
/usr/bin/../lib64/gcc/x86_64-openmandriva-linux-gnu/10.0.0/../../../../include/c++/10.0.0/ranges:1854:9)]
        _RangeAdaptor(_Callable __callable)
        ^
/usr/bin/../lib64/gcc/x86_64-openmandriva-linux-gnu/10.0.0/../../../../include/c++/10.0.0/ranges:2000:47:
error: ambiguous deduction for template arguments of '_RangeAdaptor'
    inline constexpr __adaptor::_RangeAdaptor take
                                              ^
/usr/bin/../lib64/gcc/x86_64-openmandriva-linux-gnu/10.0.0/../../../../include/c++/10.0.0/ranges:1073:2:
note: candidate function [with _Callable = std::ranges::views::(lambda at
/usr/bin/../lib64/gcc/x86_64-openmandriva-linux-gnu/10.0.0/../../../../include/c++/10.0.0/ranges:2001:9)]
        _RangeAdaptor(const _Callable& = {})
        ^
/usr/bin/../lib64/gcc/x86_64-openmandriva-linux-gnu/10.0.0/../../../../include/c++/10.0.0/ranges:1078:2:
note: candidate function [with _Callable = std::ranges::views::(lambda at
/usr/bin/../lib64/gcc/x86_64-openmandriva-linux-gnu/10.0.0/../../../../include/c++/10.0.0/ranges:2001:9)]
        _RangeAdaptor(_Callable __callable)
        ^
/usr/bin/../lib64/gcc/x86_64-openmandriva-linux-gnu/10.0.0/../../../../include/c++/10.0.0/ranges:2092:47:
error: ambiguous deduction for template arguments of '_RangeAdaptor'
    inline constexpr __adaptor::_RangeAdaptor take_while
                                              ^
/usr/bin/../lib64/gcc/x86_64-openmandriva-linux-gnu/10.0.0/../../../../include/c++/10.0.0/ranges:1073:2:
note: candidate function [with _Callable = std::ranges::views::(lambda at
/usr/bin/../lib64/gcc/x86_64-openmandriva-linux-gnu/10.0.0/../../../../include/c++/10.0.0/ranges:2093:9)]
        _RangeAdaptor(const _Callable& = {})
        ^
/usr/bin/../lib64/gcc/x86_64-openmandriva-linux-gnu/10.0.0/../../../../include/c++/10.0.0/ranges:1078:2:
note: candidate function [with _Callable = std::ranges::views::(lambda at
/usr/bin/../lib64/gcc/x86_64-openmandriva-linux-gnu/10.0.0/../../../../include/c++/10.0.0/ranges:2093:9)]
        _RangeAdaptor(_Callable __callable)
        ^
/usr/bin/../lib64/gcc/x86_64-openmandriva-linux-gnu/10.0.0/../../../../include/c++/10.0.0/ranges:2169:47:
error: ambiguous deduction for template arguments of '_RangeAdaptor'
    inline constexpr __adaptor::_RangeAdaptor drop
                                              ^
/usr/bin/../lib64/gcc/x86_64-openmandriva-linux-gnu/10.0.0/../../../../include/c++/10.0.0/ranges:1073:2:
note: candidate function [with _Callable = std::ranges::views::(lambda at
/usr/bin/../lib64/gcc/x86_64-openmandriva-linux-gnu/10.0.0/../../../../include/c++/10.0.0/ranges:2170:9)]
        _RangeAdaptor(const _Callable& = {})
        ^
/usr/bin/../lib64/gcc/x86_64-openmandriva-linux-gnu/10.0.0/../../../../include/c++/10.0.0/ranges:1078:2:
note: candidate function [with _Callable = std::ranges::views::(lambda at
/usr/bin/../lib64/gcc/x86_64-openmandriva-linux-gnu/10.0.0/../../../../include/c++/10.0.0/ranges:2170:9)]
        _RangeAdaptor(_Callable __callable)
        ^
/usr/bin/../lib64/gcc/x86_64-openmandriva-linux-gnu/10.0.0/../../../../include/c++/10.0.0/ranges:2225:47:
error: ambiguous deduction for template arguments of '_RangeAdaptor'
    inline constexpr __adaptor::_RangeAdaptor drop_while
                                              ^
/usr/bin/../lib64/gcc/x86_64-openmandriva-linux-gnu/10.0.0/../../../../include/c++/10.0.0/ranges:1073:2:
note: candidate function [with _Callable = std::ranges::views::(lambda at
/usr/bin/../lib64/gcc/x86_64-openmandriva-linux-gnu/10.0.0/../../../../include/c++/10.0.0/ranges:2226:9)]
        _RangeAdaptor(const _Callable& = {})
        ^
/usr/bin/../lib64/gcc/x86_64-openmandriva-linux-gnu/10.0.0/../../../../include/c++/10.0.0/ranges:1078:2:
note: candidate function [with _Callable = std::ranges::views::(lambda at
/usr/bin/../lib64/gcc/x86_64-openmandriva-linux-gnu/10.0.0/../../../../include/c++/10.0.0/ranges:2226:9)]
        _RangeAdaptor(_Callable __callable)
        ^
/usr/bin/../lib64/gcc/x86_64-openmandriva-linux-gnu/10.0.0/../../../../include/c++/10.0.0/ranges:2297:10:
error: missing 'typename' prior to dependent type name
'iterator_traits<iterator_t<_Base> >::iterator_category'
              = iterator_traits<iterator_t<_Base>>::iterator_category;
                ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/bin/../lib64/gcc/x86_64-openmandriva-linux-gnu/10.0.0/../../../../include/c++/10.0.0/ranges:2299:10:
error: missing 'typename' prior to dependent type name
'iterator_traits<iterator_t<range_reference_t<_Base> > >::iterator_category'
              = iterator_traits<iterator_t<range_reference_t<_Base>>>
                ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/bin/../lib64/gcc/x86_64-openmandriva-linux-gnu/10.0.0/../../../../include/c++/10.0.0/ranges:2768:19:
error: missing 'typename' prior to dependent type name
'iterator_traits<iterator_t<_Base> >::iterator_category'
            using _Cat = iterator_traits<iterator_t<_Base>>::iterator_category;
                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/bin/../lib64/gcc/x86_64-openmandriva-linux-gnu/10.0.0/../../../../include/c++/10.0.0/ranges:2942:47:
error: ambiguous deduction for template arguments of '_RangeAdaptor'
    inline constexpr __adaptor::_RangeAdaptor split
                                              ^
/usr/bin/../lib64/gcc/x86_64-openmandriva-linux-gnu/10.0.0/../../../../include/c++/10.0.0/ranges:1073:2:
note: candidate function [with _Callable = std::ranges::views::(lambda at
/usr/bin/../lib64/gcc/x86_64-openmandriva-linux-gnu/10.0.0/../../../../include/c++/10.0.0/ranges:2943:9)]
        _RangeAdaptor(const _Callable& = {})
        ^
/usr/bin/../lib64/gcc/x86_64-openmandriva-linux-gnu/10.0.0/../../../../include/c++/10.0.0/ranges:1078:2:
note: candidate function [with _Callable = std::ranges::views::(lambda at
/usr/bin/../lib64/gcc/x86_64-openmandriva-linux-gnu/10.0.0/../../../../include/c++/10.0.0/ranges:2943:9)]
        _RangeAdaptor(_Callable __callable)
        ^
12 errors generated.


libstdc++ from gcc 10-20200209 works perfectly with both gcc and clang.

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