[Bug 1901080] Re: libgphobos1: ABI breakage in SRU

[Matthias Klose]

lowering exaggerated severity. No, ABI stability was not impacted
besides for libphobos.

** Changed in: gcc-10 (Ubuntu)
   Importance: Critical => High

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Title:
  libgphobos1: ABI breakage in SRU

Status in gcc-10 package in Ubuntu:
  New

Bug description:
  gcc-10 was SRUed to focal, and in the process introduced regressions
  caused by ABI breakage of libgphobos1.

  This has manifested as failing autopkgtests of the dub package,
  following unrelated SRUs:

  [...]
  autopkgtest [13:52:44]: test run:  - - - - - - - - - - stderr - - - - - - - - - -
  dub: symbol lookup error: dub: undefined symbol: _D3std3net4curl4HTTP9__mixin376onSendMFNdDFAvZmZv
  [...]

  The symbol present in the new version of libgphobos1 is now
  _D3std3net4curl4HTTP9__mixin396onSendMFNdDFAvZmZv instead of
  _D3std3net4curl4HTTP9__mixin376onSendMFNdDFAvZmZv.

  Libraries are not allowed to change ABI without changing binary
  package name.  And for libraries built from such a core package as
  gcc, ABIs should be enforced at package build time to avoid such
  regressions.

  This regression was overlooked at the time of gcc SRU because the
  autopkgtests for gcc uploads are special-cased to not test all
  reverse-dependencies; so it's incumbent on gcc to properly enforce ABI
  stability.

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