Bug#893517: Installation of gcc-8 made clang-6 unusable.

[Roman Lebedev]

Package: clang-6.0
Version: 1:6.0-1
Severity: serious

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$ cat test.cpp 
#include <ostream>
$ clang++-6.0 -c test.cpp 
In file included from test.cpp:1:
In file included from /usr/bin/../lib64/gcc/x86_64-linux-gnu/8.0.1/../../../../include/c++/8.0.1/ostream:38:
In file included from /usr/bin/../lib64/gcc/x86_64-linux-gnu/8.0.1/../../../../include/c++/8.0.1/ios:42:
In file included from /usr/bin/../lib64/gcc/x86_64-linux-gnu/8.0.1/../../../../include/c++/8.0.1/bits/ios_base.h:41:
In file included from /usr/bin/../lib64/gcc/x86_64-linux-gnu/8.0.1/../../../../include/c++/8.0.1/bits/locale_classes.h:40:
In file included from /usr/bin/../lib64/gcc/x86_64-linux-gnu/8.0.1/../../../../include/c++/8.0.1/string:48:
/usr/bin/../lib64/gcc/x86_64-linux-gnu/8.0.1/../../../../include/c++/8.0.1/bits/stl_function.h:545:9: error: redefinition of '__not_overloaded<_Tp, _Up>'
        struct __not_overloaded<_Tp, _Up> : __not_overloaded2<_Tp, _Up> { };
               ^~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/bin/../lib64/gcc/x86_64-linux-gnu/8.0.1/../../../../include/c++/8.0.1/bits/stl_function.h:531:9: note: previous definition is here
        struct __not_overloaded<_Tp, _Up, __void_t<
               ^
/usr/bin/../lib64/gcc/x86_64-linux-gnu/8.0.1/../../../../include/c++/8.0.1/bits/stl_function.h:608:9: error: redefinition of '__not_overloaded<_Tp, _Up>'
        struct __not_overloaded<_Tp, _Up> : __not_overloaded2<_Tp, _Up> { };
               ^~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/bin/../lib64/gcc/x86_64-linux-gnu/8.0.1/../../../../include/c++/8.0.1/bits/stl_function.h:594:9: note: previous definition is here
        struct __not_overloaded<_Tp, _Up, __void_t<
               ^
/usr/bin/../lib64/gcc/x86_64-linux-gnu/8.0.1/../../../../include/c++/8.0.1/bits/stl_function.h:671:9: error: redefinition of '__not_overloaded<_Tp, _Up>'
        struct __not_overloaded<_Tp, _Up> : __not_overloaded2<_Tp, _Up> { };
               ^~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/bin/../lib64/gcc/x86_64-linux-gnu/8.0.1/../../../../include/c++/8.0.1/bits/stl_function.h:657:9: note: previous definition is here
        struct __not_overloaded<_Tp, _Up, __void_t<
               ^
/usr/bin/../lib64/gcc/x86_64-linux-gnu/8.0.1/../../../../include/c++/8.0.1/bits/stl_function.h:734:9: error: redefinition of '__not_overloaded<_Tp, _Up>'
        struct __not_overloaded<_Tp, _Up> : __not_overloaded2<_Tp, _Up> { };
               ^~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/bin/../lib64/gcc/x86_64-linux-gnu/8.0.1/../../../../include/c++/8.0.1/bits/stl_function.h:720:9: note: previous definition is here
        struct __not_overloaded<_Tp, _Up, __void_t<
               ^
4 errors generated.


Strangely, clang-5 still works.
But clang-7 fails too.

- -- System Information:
Debian Release: buster/sid
  APT prefers unstable
  APT policy: (990, 'unstable'), (500, 'unstable-debug'), (1, 'experimental-debug'), (1, 'experimental')
Architecture: amd64 (x86_64)

Kernel: Linux 4.15.0-1-amd64 (SMP w/8 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE=en_US (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages clang-6.0 depends on:
ii  binutils                 2.30-8
ii  libc6                    2.27-2
ii  libc6-dev                2.27-2
ii  libclang-common-6.0-dev  1:6.0-1
ii  libclang1-6.0            1:6.0-1
ii  libgcc-7-dev             7.3.0-12
ii  libgcc1                  1:8-20180319-1
ii  libjsoncpp1              1.7.4-3
ii  libllvm6.0               1:6.0-1
ii  libobjc-7-dev            7.3.0-12
ii  libstdc++-7-dev          7.3.0-12
ii  libstdc++6               8-20180319-1

Versions of packages clang-6.0 recommends:
ii  libomp-dev    6.0-1
ii  llvm-6.0-dev  1:6.0-1
ii  python        2.7.14-4

Versions of packages clang-6.0 suggests:
pn  clang-6.0-doc  <none>
pn  gnustep        <none>
pn  gnustep-devel  <none>

- -- no debconf information

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