Fails with:

[  183s] ../Source/JavaScriptCore/assembler/MacroAssemblerCodeRef.h:100:15:
error: 'template<class ReturnType, class ... Arguments> constexpr
JSC::CFunctionPtr::CFunctionPtr(ReturnType (&)(Arguments ...))' cannot be
overloaded with 'template<class ReturnType, class ... Arguments> constexpr
JSC::CFunctionPtr::CFunctionPtr(ReturnType (&)(Arguments ...))'
[  183s]   100 |     constexpr CFunctionPtr(ReturnType(FASTCALL
&ptr)(Arguments...))
[  183s]       |               ^~~~~~~~~~~~
[  183s] ../Source/JavaScriptCore/assembler/MacroAssemblerCodeRef.h:70:15:
note: previous declaration 'template<class ReturnType, class ... Arguments>
constexpr JSC::CFunctionPtr::CFunctionPtr(ReturnType (&)(Arguments ...))'
[  183s]    70 |     constexpr CFunctionPtr(ReturnType(&ptr)(Arguments...))
[  183s]       |               ^~~~~~~~~~~~
[  183s] ../Source/JavaScriptCore/assembler/MacroAssemblerCodeRef.h:105:14:
error: 'template<class ReturnType, class ... Arguments>
JSC::CFunctionPtr::CFunctionPtr(ReturnType (*)(Arguments ...))' cannot be
overloaded with 'template<class ReturnType, class ... Arguments>
JSC::CFunctionPtr::CFunctionPtr(ReturnType (*)(Arguments ...))'
[  183s]   105 |     explicit CFunctionPtr(ReturnType(FASTCALL
*ptr)(Arguments...))
[  183s]       |              ^~~~~~~~~~~~
[  183s] ../Source/JavaScriptCore/assembler/MacroAssemblerCodeRef.h:75:14:
note: previous declaration 'template<class ReturnType, class ... Arguments>
JSC::CFunctionPtr::CFunctionPtr(ReturnType (*)(Arguments ...))'
[  183s]    75 |     explicit CFunctionPtr(ReturnType(*ptr)(Arguments...))
[  183s]       |              ^~~~~~~~~~~~
[  183s] ../Source/JavaScriptCore/assembler/MacroAssemblerCodeRef.h:161:5:
error: 'template<WTF::PtrTag tag> template<class ReturnType, class ...
Arguments> JSC::FunctionPtr<tag>::FunctionPtr(ReturnType (*)(Arguments ...))'
cannot be overloaded with 'template<WTF::PtrTag tag> template<class ReturnType,
class ... Arguments> JSC::FunctionPtr<tag>::FunctionPtr(ReturnType
(*)(Arguments ...))'
[  183s]   161 |     FunctionPtr(ReturnType(FASTCALL *value)(Arguments...))
[  183s]       |     ^~~~~~~~~~~
[  183s] ../Source/JavaScriptCore/assembler/MacroAssemblerCodeRef.h:137:5:
note: previous declaration 'template<WTF::PtrTag tag> template<class
ReturnType, class ... Arguments> JSC::FunctionPtr<tag>::FunctionPtr(ReturnType
(*)(Arguments ...))'
[  183s]   137 |     FunctionPtr(ReturnType(*value)(Arguments...))
[  183s]       |     ^~~~~~~~~~~

here:
https://build.opensuse.org/package/live_build_log/openSUSE:Factory:Staging:N/webkit2gtk3/standard/i586