[Webkit-unassigned] [Bug 227166] New: [LFC][WPE] Build failure with GCC 8.x

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=227166

            Bug ID: 227166
           Summary: [LFC][WPE] Build failure with GCC 8.x
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WPE WebKit
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: clopez at igalia.com
                CC: bugs-noreply at webkitgtk.org, koivisto at iki.fi,
                    zalan at apple.com

When building the WPE port with GCC 8.x (shipped by default on distros like Debian 10 or RHEL 8) the following build failure happens if LAYOUT_FORMATTING_CONTEXT is enabled:

Building CXX object Source/WebCore/CMakeFiles/WebCore.dir/__/__/WebCore/DerivedSources/unified-sources/UnifiedSource-207b877e-6.cpp.o
[...]
In file included from WebCore/DerivedSources/unified-sources/UnifiedSource-207b877e-6.cpp:6:
../../Source/WebCore/layout/integration/LayoutIntegrationLineLayout.cpp: In member function ‘void WebCore::LayoutIntegration::LineLayout::prepareLayoutState()’:
../../Source/WebCore/layout/integration/LayoutIntegrationLineLayout.cpp:253:36: error: converting to ‘std::optional<WebCore::Layout::Edges>’ from initializer list would use explicit constructor ‘constexpr std::optional<_Tp>::optional(std::in_place_t, _Args&& ...) [with _Args = {}; typename std::enable_if<is_constructible_v<_Tp, _Args&& ...>, bool>::type <anonymous> = 0; _Tp = WebCore::Layout::Edges]’
     rootGeometry.setPadding({ { } });
                                    ^
../../Source/WebCore/layout/integration/LayoutIntegrationLineLayout.cpp:253:36: error: converting to ‘std::in_place_t’ from initializer list would use explicit constructor ‘constexpr std::in_place_t::in_place_t()’
ninja: build stopped: subcommand failed.

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