Description of problem:

I can not build a custom application using qtwebengine anymore. I have the following errors:

  /usr/bin/ld: /usr/lib64/libQt5WebEngineCore.so.5.12.2: undefined reference to `re2::RE2::Arg::parse_int(char const*, int, void*)'
  /usr/bin/ld: /usr/lib64/libQt5WebEngineCore.so.5.12.2: undefined reference to `re2::RE2::Arg::parse_string(char const*, int, void*)'

The issue seems to be that the re2 lib has been updated recently, but qtwebengine has been built against an older version. Look at the objdump output:

]$ objdump -TC /usr/lib64/libre2.so | grep parse_int
000000000003c0e0 g    DF .text  0000000000000061  Base        re2::RE2::Arg::parse_int_radix(char const*, unsigned long, void*, int)
000000000003c430 g    DF .text  000000000000000e  Base        re2::RE2::Arg::parse_int_octal(char const*, unsigned long, void*)
000000000003c410 g    DF .text  000000000000000e  Base        re2::RE2::Arg::parse_int(char const*, unsigned long, void*)
000000000003c440 g    DF .text  000000000000000b  Base        re2::RE2::Arg::parse_int_cradix(char const*, unsigned long, void*)
000000000003c420 g    DF .text  000000000000000e  Base        re2::RE2::Arg::parse_int_hex(char const*, unsigned long, void*)

As you can see, the signature is different (unsigned long instead of int).



Version-Release number of selected component (if applicable):

$ dnf info qt5-qtwebengine-devel re2
Last metadata expiration check: 0:33:00 ago on Wed Aug 14 11:06:37 2019.
Installed Packages
Name         : qt5-qtwebengine-devel
Version      : 5.12.2
Release      : 1.fc29
Architecture : x86_64
Size         : 312 k
Source       : qt5-qtwebengine-5.12.2-1.fc29.src.rpm
Repository   : @System
From repo    : updates
Summary      : Development files for qt5-qtwebengine
URL          : http://www.qt.io
License      : (LGPLv2 with exceptions or GPLv3 with exceptions) and BSD and
             : LGPLv2+ and ASL 2.0 and IJG and MIT and GPLv2+ and ISC and
             : OpenSSL and (MPLv1.1 or GPLv2 or LGPLv2)
Description  : Development files for qt5-qtwebengine.

Name         : re2
Version      : 20190801
Release      : 1.fc29
Architecture : x86_64
Size         : 479 k
Source       : re2-20190801-1.fc29.src.rpm
Repository   : @System
From repo    : updates
Summary      : C++ fast alternative to backtracking RE engines
URL          : http://github.com/google/re2/
License      : BSD
Description  : RE2 is a C++ library providing a fast, safe, thread-friendly
             : alternative to backtracking regular expression engines like those
             : used in PCRE, Perl, and Python.
             : 
             : Backtracking engines are typically full of features and
             : convenient syntactic sugar but can be forced into taking
             : exponential amounts of time on even small inputs.
             : 
             : In contrast, RE2 uses automata theory to guarantee that regular
             : expression searches run in time linear in the size of the input,
             : at the expense of some missing features (e.g back references and
             : generalized assertions).

Available Packages
Name         : qt5-qtwebengine-devel
Version      : 5.12.2
Release      : 1.fc29
Architecture : i686
Size         : 71 k
Source       : qt5-qtwebengine-5.12.2-1.fc29.src.rpm
Repository   : updates
Summary      : Development files for qt5-qtwebengine
URL          : http://www.qt.io
License      : (LGPLv2 with exceptions or GPLv3 with exceptions) and BSD and
             : LGPLv2+ and ASL 2.0 and IJG and MIT and GPLv2+ and ISC and
             : OpenSSL and (MPLv1.1 or GPLv2 or LGPLv2)
Description  : Development files for qt5-qtwebengine.

Name         : re2
Version      : 20190801
Release      : 1.fc29
Architecture : i686
Size         : 188 k
Source       : re2-20190801-1.fc29.src.rpm
Repository   : updates
Summary      : C++ fast alternative to backtracking RE engines
URL          : http://github.com/google/re2/
License      : BSD
Description  : RE2 is a C++ library providing a fast, safe, thread-friendly
             : alternative to backtracking regular expression engines like those
             : used in PCRE, Perl, and Python.
             : 
             : Backtracking engines are typically full of features and
             : convenient syntactic sugar but can be forced into taking
             : exponential amounts of time on even small inputs.
             : 
             : In contrast, RE2 uses automata theory to guarantee that regular
             : expression searches run in time linear in the size of the input,
             : at the expense of some missing features (e.g back references and
             : generalized assertions).



How reproducible:
build a minimal qt webengine application I guess and try to compile/link with standard f29 packages (from the updates repository).


Actual results:
can't link against libQt5WebEngineCore.so due to an error linking to libre2.so

Expected results:
link is possible.