Bug 297192 – [GTK][WPE] error: reference to type 'const WebCore::Style::PositionY' requires an initializer after 298460@main

• Component: New Bugs
• Status: RESOLVED FIXED

[Fujii Hironori]

[GTK][WPE] error: reference to type 'const WebCore::Style::PositionY' requires an initializer after 298460@main

After 298460@main, Combination of Clang and libstdc++ can't compile WebKit.

https://webkit.slack.com/archives/CU64U6FDW/p1754723550222259
https://pastebin.com/cLZTNW2V

Buildbot: builder GTK-Linux-64-bit-Release-Clang-Build build 18818
https://build.webkit.org/#/builders/629/builds/18818

In file included from /buildbot-worker/work/GTK-Linux-64-bit-Release-Clang-Build/build/WebKitBuild/GTK/Release/WTF/Headers/wtf/StdLibExtras.h:36:
In file included from /usr/lib/gcc/x86_64-linux-gnu/14/../../../../include/c++/14/functional:53:
/usr/lib/gcc/x86_64-linux-gnu/14/../../../../include/c++/14/tuple:199:9: error: reference to type 'const WebCore::Style::PositionY' requires an initializer
  199 |       : _M_head_impl() { }
      |         ^
/usr/lib/gcc/x86_64-linux-gnu/14/../../../../include/c++/14/tuple:563:9: note: in instantiation of member function 'std::_Head_base<1, const WebCore::Style::PositionY &>::_Head_base' requested here
  563 |       : _Base() { }
      |         ^
/buildbot-worker/work/GTK-Linux-64-bit-Release-Clang-Build/build/Source/WebCore/css/values/primitives/CSSPrimitiveKeywordList.h:45:36: note: in instantiation of member function 'std::_Tuple_impl<1, const WebCore::Style::PositionY &>::_Tuple_impl' requested here
   45 |     = KeywordsList::isValidKeyword(Keyword()) && PrimitiveKeyword<Keyword>;
      |                                    ^
/buildbot-worker/work/GTK-Linux-64-bit-Release-Clang-Build/build/Source/WebCore/css/values/primitives/CSSPrimitiveKeywordList.h:45:7: note: while substituting template arguments into constraint expression here
   45 |     = KeywordsList::isValidKeyword(Keyword()) && PrimitiveKeyword<Keyword>;
      |       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/buildbot-worker/work/GTK-Linux-64-bit-Release-Clang-Build/build/Source/WebCore/style/values/primitives/StyleLengthWrapper.h:68:23: note: while checking the satisfaction of concept 'ValidKeywordForList<std::_Tuple_impl<1, const WebCore::Style::PositionY &>, WebCore::CSS::PrimitiveKeywordList<>>' requested here
   68 |     LengthWrapperBase(CSS::ValidKeywordForList<Keywords> auto keyword) : m_value(Keywords::offsetForKeyword(keyword)) { }
      |                       ^
/buildbot-worker/work/GTK-Linux-64-bit-Release-Clang-Build/build/Source/WebCore/style/values/primitives/StyleLengthWrapper.h:68:23: note: while substituting template arguments into constraint expression here
   68 |     LengthWrapperBase(CSS::ValidKeywordForList<Keywords> auto keyword) : m_value(Keywords::offsetForKeyword(keyword)) { }
      |                       ^~~~~~~~~~~~~~~~~~~~~~~~
/usr/lib/gcc/x86_64-linux-gnu/14/../../../../include/c++/14/tuple:326:7: note: (skipping 8 contexts in backtrace; use -ftemplate-backtrace-limit=0 to see all)
  326 |       _Tuple_impl(_Tuple_impl&&) = default;
      |       ^
/buildbot-worker/work/GTK-Linux-64-bit-Release-Clang-Build/build/WebKitBuild/GTK/Release/WTF/Headers/wtf/StdLibExtras.h:1354:20: note: in instantiation of function template specialization 'WTF::detail::tuple_zip_impl<const WebCore::Style::Position &, const WebCore::Style::Position &, 0UL, 1UL>' requested here
 1354 |     return detail::tuple_zip_impl<Head, Tail...>(
      |                    ^
/buildbot-worker/work/GTK-Linux-64-bit-Release-Clang-Build/build/Source/WebCore/style/values/StyleValueTypes.h:862:13: note: in instantiation of function template specialization 'WTF::tuple_zip<const WebCore::Style::Position &, const WebCore::Style::Position &>' requested here
  862 |     }, WTF::tuple_zip(a, b));
      |             ^
/buildbot-worker/work/GTK-Linux-64-bit-Release-Clang-Build/build/Source/WebCore/style/values/StyleValueTypes.h:951:16: note: in instantiation of function template specialization 'WebCore::Style::equalsForBlendingOnTupleLike<WebCore::Style::Position>' requested here
  951 |         return equalsForBlendingOnTupleLike(a, b, aStyle, bStyle);
      |                ^
/buildbot-worker/work/GTK-Linux-64-bit-Release-Clang-Build/build/Source/WebCore/style/StyleInterpolationWrappers.h:144:16: note: in instantiation of function template specialization 'WebCore::Style::EqualsForBlendingInvoker::operator()<WebCore::Style::Position>' requested here
  144 |         return Style::equalsForBlending(this->value(from), this->value(to), from, to);
      |                ^
/buildbot-worker/work/GTK-Linux-64-bit-Release-Clang-Build/build/Source/WebCore/style/StyleInterpolationWrappers.h:130:7: note: in instantiation of member function 'WebCore::Style::Interpolation::StyleTypeWrapper<WebCore::Style::Position, const WebCore::Style::Position &, WebCore::Style::Position &&>::equals' requested here
  130 | class StyleTypeWrapper : public WrapperBase {
      |       ^

[Fujii Hironori]

Pull request: https://github.com/WebKit/WebKit/pull/49196

[EWS]

Committed 298491@main (4ebc245e2259): <https://commits.webkit.org/298491@main>

Reviewed commits have been landed. Closing PR #49196 and removing active labels.

[Radar WebKit Bug Importer]

<rdar://problem/157996627>