[llvm-bugs] [Bug 50328] New: clang12 fails to compile <ranges> from Gcc 11.1

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=50328

            Bug ID: 50328
           Summary: clang12 fails to compile <ranges> from Gcc 11.1
           Product: clang
           Version: 12.0
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++2a
          Assignee: unassignedclangbugs at nondot.org
          Reporter: florin at signbit.net
                CC: blitzrakete at gmail.com, erik.pilkington at gmail.com,
                    llvm-bugs at lists.llvm.org, richard-llvm at metafoo.co.uk

Note: this bug has the same summary as
https://bugs.llvm.org/show_bug.cgi?id=46746 but a whole different presentation.

The following source file fails to build with Clang12 when using libstdc++ from
Gcc11.0:

 -- 8< -- 8< -- 8< -- 8< -- 8< -- 8< -- 8< -- 8< -- 8< -- 8< 

 #include <ranges>

 -- 8< -- 8< -- 8< -- 8< -- 8< -- 8< -- 8< -- 8< -- 8< -- 8< 


Here's the shell session:

$ g++-11 -v
Using built-in specs.
COLLECT_GCC=g++-11
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/11/lto-wrapper
OFFLOAD_TARGET_NAMES=nvptx-none:amdgcn-amdhsa
OFFLOAD_TARGET_DEFAULT=1
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu
11.1.0-1ubuntu1~20.04' --with-bugurl=file:///usr/share/doc/gcc-11/README.Bugs
--enable-languages=c,ada,c++,go,brig,d,fortran,objc,obj-c++,m2 --prefix=/usr
--with-gcc-major-version-only --program-suffix=-11
--program-prefix=x86_64-linux-gnu- --enable-shared --enable-linker-build-id
--libexecdir=/usr/lib --without-included-gettext --enable-threads=posix
--libdir=/usr/lib --enable-nls --enable-bootstrap --enable-clocale=gnu
--enable-libstdcxx-debug --enable-libstdcxx-time=yes
--with-default-libstdcxx-abi=new --enable-gnu-unique-object
--disable-vtable-verify --enable-plugin --enable-default-pie --with-system-zlib
--enable-libphobos-checking=release --with-target-system-zlib=auto
--enable-objc-gc=auto --enable-multiarch --disable-werror --disable-cet
--with-arch-32=i686 --with-abi=m64 --with-multilib-list=m32,m64,mx32
--enable-multilib --with-tune=generic
--enable-offload-targets=nvptx-none=/build/gcc-11-2V7zgg/gcc-11-11.1.0/debian/tmp-nvptx/usr,amdgcn-amdhsa=/build/gcc-11-2V7zgg/gcc-11-11.1.0/debian/tmp-gcn/usr
--without-cuda-driver --enable-checking=release --build=x86_64-linux-gnu
--host=x86_64-linux-gnu --target=x86_64-linux-gnu
--with-build-config=bootstrap-lto-lean --enable-link-serialization=2
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 11.1.0 (Ubuntu 11.1.0-1ubuntu1~20.04)
$ /tools/clang+llvm-12.0.0-x86_64-linux-gnu-ubuntu-20.04/bin/clang++ -v
clang version 12.0.0 (https://github.com/llvm/llvm-project/
b978a93635b584db380274d7c8963c73989944a1)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /tools/clang+llvm-12.0.0-x86_64-linux-gnu-ubuntu-20.04/bin
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/11
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/9
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/11
Candidate multilib: .;@m64
Selected multilib: .;@m64
$ /tools/clang+llvm-12.0.0-x86_64-linux-gnu-ubuntu-20.04/bin/clang++ -std=c++20
-c clang12_ranges.cpp
In file included from clang12_ranges.cpp:1:
/usr/lib/gcc/x86_64-linux-gnu/11/../../../../include/c++/11/ranges:3392:19:
error: missing 'typename' prior to dependent type name
'iterator_traits<iterator_t<_Base>>::iterator_category'
            using _Cat = iterator_traits<iterator_t<_Base>>::iterator_category;
                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1 error generated.

The same translation unit compiles fine if I force clang to use a Gcc10.3 based
toolchain.

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