[Webkit-unassigned] [Bug 199108] New: [cmake] Switch to built-in handling of C++ standard instead of hardcoding -std=c++17

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=199108

            Bug ID: 199108
           Summary: [cmake] Switch to built-in handling of C++ standard
                    instead of hardcoding -std=c++17
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CMake
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: annulen at yandex.ru

Rationale:

1. It provides an abstraction over exact flags of particular compilers - we just specify required version of C++ standard
2. External libraries (like Qt used in WPEQt) may require particular C++ standard or even particular C++ features to be availabe (e.g. Qt requires INTERFACE_COMPILE_FEATURES cxx_decltype, which causes cmake to add -std=gnu++11 unless proper CXX_STANDARD is defined)

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