Bug 246447 – [GCC] Build error in Ubuntu 20.04 after 255095@main

• Component: New Bugs
• Status: RESOLVED FIXED

[Diego Pino]

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.

[Matthieu Dubet]

Pull request: https://github.com/WebKit/WebKit/pull/5322

[Alexey Proskuryakov]

This was fixed via a different PR:

Committed 255482@main (a994d17): https://commits.webkit.org/255482@main

Reviewed commits have been landed. Closing PR #5321 and removing active labels.

[Radar WebKit Bug Importer]

<rdar://problem/101151548>