[konsole] [Bug 432639] New: Konsole needs gcc > 8.3 (fully supporting C++17) for for_each_n function

[bugzilla_noreply at kde.org]

https://bugs.kde.org/show_bug.cgi?id=432639

            Bug ID: 432639
           Summary: Konsole needs gcc > 8.3 (fully supporting C++17) for
                    for_each_n function
           Product: konsole
           Version: master
          Platform: Compiled Sources
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: konsole-devel at kde.org
          Reporter: rcorreia31 at gmail.com
  Target Milestone: ---

SUMMARY
By default CentOS 8.3 uses gcc 8.3.1.
Konsole from master now fails due to this error:
/media/MyPassport/git/konsole/src/Screen.cpp: In function 'void toDebug(const
Konsole::Character*, int, bool)':
/media/MyPassport/git/konsole/src/Screen.cpp:394:10: error: 'for_each_n' is not
a member of 'std'
     std::for_each_n(s, count, [&out](const Character &i) { out += i.character;
});
          ^~~~~~~~~~
/media/MyPassport/git/konsole/src/Screen.cpp:394:10: note: suggested
alternative: 'for_each'
     std::for_each_n(s, count, [&out](const Character &i) { out += i.character;
});
          ^~~~~~~~~~
          for_each

To be able to compile, another tool chain fully supporting C++17 must be
installed and enabled: dnf install gcc-toolset-10-toolchain (or
gcc-toolset-9-toolchain).
Then all compiles well.
This is the first time this requirement appears for KDE from what I can tell.

A link about that: https://github.com/VcDevel/Vc/issues/182

Even if this is easily fixed with a newer toolchain, it will cause some
questions.

STEPS TO REPRODUCE
1. cmake
2. make

OBSERVED RESULT
Compilation error: 
/git/konsole/src/Screen.cpp:394:10: error: 'for_each_n' is not a member of
'std'
/git/konsole/src/Screen.cpp:394:10: note: suggested alternative: 'for_each'

EXPECTED RESULT
Change to a source code allowing a successful compilation with gcc 8.3.x or add
a cmake check explaining this new requirement (dnf install
gcc-toolset-10-toolchain or dnf install gcc-toolset-9-toolchain).

SOFTWARE/OS VERSIONS
KDE Plasma Version: 5.20.2
KDE Frameworks Version: 5.76.0
Qt Version: 5.15.1

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