[Webkit-unassigned] [Bug 246447] New: [GCC] Build error in Ubuntu 20.04 after 255095 at main

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=246447

            Bug ID: 246447
           Summary: [GCC] Build error in Ubuntu 20.04 after 255095 at main
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: New Bugs
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: dpino at igalia.com

The Ubuntu 20.04 bot is failing with the following error:

```
/home/buildbot/worker/GTK-Linux-64-bit-Release-Ubuntu-2004-Build/build/Source/WebCore/css/StyleColor.h:53:50: error: ‘bool WebCore::CurrentColor::operator==(const WebCore::CurrentColor&) const’ cannot be defaulted
   53 |     bool operator==(const CurrentColor&) const = default;
      |                                                  ^~~~~~~
/home/buildbot/worker/GTK-Linux-64-bit-Release-Ubuntu-2004-Build/build/Source/WebCore/css/StyleColor.h:78:48: error: ‘bool WebCore::StyleColor::operator==(const WebCore::StyleColor&) const’ cannot be defaulted
   78 |     bool operator==(const StyleColor&) const = default;
      |                                                ^~~~~~~
/home/buildbot/worker/GTK-Linux-64-bit-Release-Ubuntu-2004-Build/build/Source/WebCore/platform/text/TextFlags.h:166:65: error: ‘bool WebCore::FontVariantAlternatesNormal::operator==(const WebCore::FontVariantAlternatesNormal&) const’ cannot be defaulted
  166 |     bool operator==(const FontVariantAlternatesNormal&) const = default;
      |                                                                 ^~~~~~~
/home/buildbot/worker/GTK-Linux-64-bit-Release-Ubuntu-2004-Build/build/Source/WebCore/platform/text/TextFlags.h:170:65: error: ‘bool WebCore::FontVariantAlternatesValues::operator==(const WebCore::FontVariantAlternatesValues&) const’ cannot be defaulted
  170 |     bool operator==(const FontVariantAlternatesValues&) const = default;
      |                                                                 ^~~~~~~
/home/buildbot/worker/GTK-Linux-64-bit-Release-Ubuntu-2004-Build/build/Source/WebCore/platform/text/TextFlags.h:187:59: error: ‘bool WebCore::FontVariantAlternates::operator==(const WebCore::FontVariantAlternates&) const’ cannot be defaulted
  187 |     bool operator==(const FontVariantAlternates&) const = default;
      |                                                           ^~~~~~~
```

Ubuntu 20.04 uses GCC9.3 It seems this version doesn't support default initialiaation of `operator==`. Also `operator!=` needs explicity definition.

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