Bug#1059535: transition: abseil

[Benjamin Barenblat <bbaren@debian.org>]

Package: release.debian.org
Severity: normal
User: release.debian.org@packages.debian.org
Usertags: transition
X-Debbugs-Cc: abseil@packages.debian.org, Rene Engelhard <rene@debian.org>
Control: affects -1 + src:abseil

Abseil 20230802 has been out for a while, and I'd like to transition sid
to it. The new version has a new ABI (with a new SONAME and new binary
package names).

Tests for 20230802.1-2 in experimental are green on all supported
architectures except mips64el and riscv64. mips64el had no installable
libc when the builders ran; I expect it'll be fine when the transition
actually happens. Large parts of Abseil (including the version already
in sid) are broken on riscv64 right now because of
https://bugs.debian.org/1059532; transitioning doesn't introduce any new
issues.

A number of packages in sid depend directly on Abseil. To give early
warning of breakages, I've done trial rebuilds as appropriate on the
amd64 porterbox. Packages that work fine with the new version:

  - grpc
  - libgav1
  - libphonenumber
  - mujoco
  - open-vm-tools
  - ycmd

Packages that are broken by the new version:

  - mozc: FTBFS because it depends on a symbol in the absl::internal
    namespace that changed without warning

  - re2: FTBFS because it needs changes to some symbols files

  - s2geometry: FTBFS because it hard-codes std=c+11 and the new version
    requires -std=c++14 or later (https://bugs.debian.org/1059228)

  - webrtc-audio-processing: FTBFS because it relies on transitive
    #includes that have changed

Packages that I'm not sure about:

  - dm-tree: has an active FTBFS (https://bugs.debian.org/1055686)

  - ortools: has an active FTBFS (https://bugs.debian.org/1024790)

  - libreoffice: too big to build on a porterbox, so left untested

Although doing a transition now will break some packages in sid, I
believe waiting is likely to cause more issues. Upstreams (LibreOffice
in particular) are starting to use features from the new version of
Abseil, and keeping the old version in sid is starting to create work
for other DDs. The breakages in sid will have to be fixed eventually
anyway, and none of them should be challenging to repair.

Ben file:

title = "abseil";
is_affected = .depends ~ /\blibabsl20220623\b/ | .depends ~ /\blibabsl20230802\b/;
is_good = .depends ~ /\blibabsl20230802\b/;
is_bad = .depends ~ /\blibabsl20220623\b/;