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Bug#908738: libc++-8-dev: please don't provide libstdc++-dev

Package: libc++-8-dev
Version: 1:8~svn340819-1
Severity: normal
X-Debbugs-CC: debian-ci@lists.debian.org
User: debian-ci@lists.debian.org
Usertags: breaks

While investigating the reason why several autopkgtest fail [1, 2, 3]
when run in testing with some package from unstable we [4] found that
this is caused by libc++-8-dev being installed. I believe this is pulled
in because:

a) libc++8-dev provides libstdc++-dev and

b) libboost1.62-dev depends on "libstdc++-4.8-dev | libstdc++-dev" (bug

After discussing this on #debian-devel on IRC, I was told that
libc++8-dev shouldn't provide libstdc++-dev if it breaks ABI like this.


[1] https://ci.debian.net/packages/a/akonadi-calendar/testing/amd64/
[2] https://ci.debian.net/packages/k/kf5-kdepim-apps-libs/testing/amd64/
[3] https://ci.debian.net/packages/libk/libkf5calendarsupport/testing/amd64/
[4] https://lists.debian.org/debian-ci/2018/09/msg00010.html

-- System Information:
Debian Release: buster/sid
  APT prefers testing-debug
  APT policy: (500, 'testing-debug'), (500, 'testing'), (200,
'testing'), (50, 'testing')
Architecture: amd64 (x86_64)

Kernel: Linux 4.17.0-3-amd64 (SMP w/2 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8),
LANGUAGE=en_US:en (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

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