Bug#1071193: libqt6core6t64/experimental breaks ABI

[Adrian Bunk <bunk@debian.org>]

On Wed, May 15, 2024 at 11:27:25PM +0300, Adrian Bunk wrote:
> Package: libqt6core6t64
> Version: 6.6.2+dfsg-7
> Severity: serious
> Tags: ftbfs
> Control: affects -1 libqt6core5compat6 src:kf6-kwallet
> 
> https://buildd.debian.org/status/logs.php?pkg=kf6-kwallet&ver=6.0.0-1
> 
> ...
> Get:32 https://deb.debian.org/debian experimental/main arm64 libqt6core6t64 arm64 6.6.2+dfsg-7 [1579 kB]
> ...
> Get:291 https://deb.debian.org/debian unstable/main arm64 libqt6core5compat6 arm64 6.4.2-4+b2 [126 kB]
> ...
> /usr/bin/ld: /lib/aarch64-linux-gnu/libQt6Core5Compat.so.6: undefined reference to `QUtf16::convertToUnicode(QByteArrayView, QStringConverterBase::State*, DataEndianness)@Qt_6'
> /usr/bin/ld: /lib/aarch64-linux-gnu/libQt6Core5Compat.so.6: undefined reference to `QUtf16::convertFromUnicode(QStringView, QStringConverterBase::State*, DataEndianness)@Qt_6'
> /usr/bin/ld: /lib/aarch64-linux-gnu/libQt6Core5Compat.so.6: undefined reference to `QUtf32::convertToUnicode(QByteArrayView, QStringConverterBase::State*, DataEndianness)@Qt_6'
> /usr/bin/ld: /lib/aarch64-linux-gnu/libQt6Core5Compat.so.6: undefined reference to `QUtf8::convertFromUnicode(QStringView)@Qt_6'
> /usr/bin/ld: /lib/aarch64-linux-gnu/libQt6Core5Compat.so.6: undefined reference to `QUtf32::convertFromUnicode(QStringView, QStringConverterBase::State*, DataEndianness)@Qt_6'
> /usr/bin/ld: /lib/aarch64-linux-gnu/libQt6Core5Compat.so.6: undefined reference to `QUtf8::convertFromUnicode(QStringView, QStringConverterBase::State*)@Qt_6'
> /usr/bin/ld: /lib/aarch64-linux-gnu/libQt6Core5Compat.so.6: undefined reference to `QUtf8::convertToUnicode(QChar*, QByteArrayView)@Qt_6'
> /usr/bin/ld: /lib/aarch64-linux-gnu/libQt6Core5Compat.so.6: undefined reference to `QUtf8::convertToUnicode(QByteArrayView, QStringConverterBase::State*)@Qt_6'
> collect2: error: ld returned 1 exit status
> 
> 
> This is due to:
> https://salsa.debian.org/qt-kde-team/qt6/qt6-base/-/commit/b1d2e462c65933b577ec49b4e4156ec8ad426b26

Apparently the symbols were moved to PRIVATE_API:
_ZN5QUtf816convertToUnicodeE14QByteArrayViewPN20QStringConverterBase5StateE@@Qt_6_PRIVATE_API
_ZN5QUtf816convertToUnicodeEPDs14QByteArrayView@@Qt_6_PRIVATE_API
_ZN6QUtf1616convertToUnicodeE14QByteArrayViewPN20QStringConverterBase5StateE14DataEndianness@@Qt_6_PRIVATE_API
_ZN6QUtf3216convertToUnicodeE14QByteArrayViewPN20QStringConverterBase5StateE14DataEndianness@@Qt_6_PRIVATE_API
_ZN5QUtf818convertFromUnicodeE11QStringView@@Qt_6_PRIVATE_API
_ZN5QUtf818convertFromUnicodeE11QStringViewPN20QStringConverterBase5StateE@@Qt_6_PRIVATE_API
_ZN6QUtf1618convertFromUnicodeE11QStringViewPN20QStringConverterBase5StateE14DataEndianness@@Qt_6_PRIVATE_API
_ZN6QUtf3218convertFromUnicodeE11QStringViewPN20QStringConverterBase5StateE14DataEndianness@@Qt_6_PRIVATE_API

This is an upstream(?) ABI break, but since libqt6core5compat6 seems 
to be the only affected package something like
  Breaks: libqt6core5compat6 (<< 6.6)
might be the best available option to avoid issues when upgrading 
from bookworm.


cu
Adrian