My Fedora 29 system received an update of the re2 package from re2-20160401-7.fc29.x86_64 to re2-20190801-1.fc29.x86_64. With the new package, I only receive an error message in Konqueror when accessing a web site because the Webengine KPart cannot be loaded any more:
Es ist ein Fehler beim Laden von Modul Webengine aufgetreten.
Die vermutliche Ursache ist:
Cannot load library /usr/lib64/qt5/plugins/kf5/parts/webenginepart.so: (/lib64/libQt5WebEngineCore.so.5: undefined symbol: _ZN3re23RE23Arg9parse_intEPKciPv)
re2::RE2::Arg::parse_int(char const*, int, void*)
Apparently this library made an incompatible change to its interface and broke its dependencies this way.
Downgrading only the re2 package back to re2-20160401-7.fc29.x86_64 fixes the problem for me.
Thanks for the report!
Yes, that is a known issue, reported and tracked in https://bugzilla.redhat.com/show_bug.cgi?id=1672014
The update is https://bodhi.fedoraproject.org/updates/FEDORA-2019-605dfb7384 (and the corresponding successful build https://koji.fedoraproject.org/koji/buildinfo?buildID=1355889)
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