JSC fails to compile with clang 15 and libc++

[Khem Raj]

With upcoming clang-15 and libc++ runtime, I am seeing a build failure in JSC, with clang-14 and libc++ it works ok.

| In file included from /mnt/b/yoe/master/build/tmp/work/core2-64-yoe-linux-musl/webkitgtk/2.36.7-r0/build/JavaScriptCore/DerivedSources/unified-sources/UnifiedSource-3a3c4ec0-3.cpp:1:
| In file included from /mnt/b/yoe/master/build/tmp/work/core2-64-yoe-linux-musl/webkitgtk/2.36.7-r0/webkitgtk-2.36.7/Source/JavaScriptCore/jit/JIT.cpp:26:
| In file included from /mnt/b/yoe/master/build/tmp/work/core2-64-yoe-linux-musl/webkitgtk/2.36.7-r0/webkitgtk-2.36.7/Source/JavaScriptCore/config.h:38:
| In file included from /mnt/b/yoe/master/build/tmp/work/core2-64-yoe-linux-musl/webkitgtk/2.36.7-r0/build/WTF/Headers/wtf/FastMalloc.h:26:
| In file included from /mnt/b/yoe/master/build/tmp/work/core2-64-yoe-linux-musl/webkitgtk/2.36.7-r0/build/WTF/Headers/wtf/StdLibExtras.h:30:
| In file included from /mnt/b/yoe/master/build/tmp/work/core2-64-yoe-linux-musl/webkitgtk/2.36.7-r0/recipe-sysroot/usr/include/c++/v1/memory:842:
| In file included from /mnt/b/yoe/master/build/tmp/work/core2-64-yoe-linux-musl/webkitgtk/2.36.7-r0/recipe-sysroot/usr/include/c++/v1/__algorithm/move.h:12:
| /mnt/b/yoe/master/build/tmp/work/core2-64-yoe-linux-musl/webkitgtk/2.36.7-r0/recipe-sysroot/usr/include/c++/v1/__algorithm/iterator_operations.h:100:5: error: static assertion failed due to requirement 'is_same<JSC::UnlinkedCallLinkInfo &, con
st JSC::UnlinkedCallLinkInfo &>::value': It looks like your iterator's `iterator_traits<It>::reference` does not match the return type of dereferencing the iterator, i.e., calling `*it`. This is undefined behavior according to [input.iterators]
and can lead to dangling reference issues at runtime, so we are flagging this.
|     static_assert(is_same<__deref_t<_Iter>, typename iterator_traits<__uncvref_t<_Iter> >::reference>::value,
|     ^             ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
| /mnt/b/yoe/master/build/tmp/work/core2-64-yoe-linux-musl/webkitgtk/2.36.7-r0/recipe-sysroot/usr/include/c++/v1/__algorithm/iterator_operations.h:115:5: note: in instantiation of function template specialization 'std::_IterOps<std::_ClassicAlgP
olicy>::__validate_iter_reference<WTF::SegmentedVectorIterator<JSC::UnlinkedCallLinkInfo, 8> &>' requested here
|     __validate_iter_reference<_Iter>();
|     ^
| /mnt/b/yoe/master/build/tmp/work/core2-64-yoe-linux-musl/webkitgtk/2.36.7-r0/recipe-sysroot/usr/include/c++/v1/__algorithm/move.h:34:39: note: in instantiation of function template specialization 'std::_IterOps<std::_ClassicAlgPolicy>::__iter_
move<WTF::SegmentedVectorIterator<JSC::UnlinkedCallLinkInfo, 8> &>' requested here
|     *__result = _IterOps<_AlgPolicy>::__iter_move(__first);
|                                       ^
| /mnt/b/yoe/master/build/tmp/work/core2-64-yoe-linux-musl/webkitgtk/2.36.7-r0/recipe-sysroot/usr/include/c++/v1/__algorithm/move.h:97:21: note: in instantiation of function template specialization 'std::__move_impl<std::_ClassicAlgPolicy, WTF::
SegmentedVectorIterator<JSC::UnlinkedCallLinkInfo, 8>, WTF::SegmentedVectorIterator<JSC::UnlinkedCallLinkInfo, 8>, JSC::UnlinkedCallLinkInfo *>' requested here
|   auto __ret = std::__move_impl<_AlgPolicy>(
|                     ^
| /mnt/b/yoe/master/build/tmp/work/core2-64-yoe-linux-musl/webkitgtk/2.36.7-r0/recipe-sysroot/usr/include/c++/v1/__algorithm/move.h:114:15: note: in instantiation of function template specialization 'std::__move<std::_ClassicAlgPolicy, WTF::Segm
entedVectorIterator<JSC::UnlinkedCallLinkInfo, 8>, WTF::SegmentedVectorIterator<JSC::UnlinkedCallLinkInfo, 8>, JSC::UnlinkedCallLinkInfo *>' requested here
|   return std::__move<_ClassicAlgPolicy>(__first, __last, __result).second;
|               ^
| /mnt/b/yoe/master/build/tmp/work/core2-64-yoe-linux-musl/webkitgtk/2.36.7-r0/webkitgtk-2.36.7/Source/JavaScriptCore/jit/JIT.cpp:993:14: note: in instantiation of function template specialization 'std::__1::move<WTF::SegmentedVectorIterator<JSC
::UnlinkedCallLinkInfo, 8>, JSC::UnlinkedCallLinkInfo *>' requested here
|         std::move(m_unlinkedCalls.begin(), m_unlinkedCalls.end(), m_jitCode->m_unlinkedCalls.begin());
|              ^

[Khem Raj]

here is where the error originates

| /mnt/b/yoe/master/build/tmp/work/core2-64-yoe-linux-musl/webkitgtk/2.36.7-r0/webkitgtk-2.36.7/Source/JavaScriptCore/jit/JIT.cpp:993:14: note: in instantiation of function template specialization 'std::__1::move<WTF::SegmentedVectorIterator<JSC
::UnlinkedCallLinkInfo, 8>, JSC::UnlinkedCallLinkInfo *>' requested here
|         std::move(m_unlinkedCalls.begin(), m_unlinkedCalls.end(), m_jitCode->m_unlinkedCalls.begin());
|              ^



/mnt/b/yoe/master/build/tmp/work/core2-64-yoe-linux-musl/webkitgtk/2.36.7-r0/webkitgtk-2.36.7/Source/JavaScriptCore/jit/JIT.cpp:996:14: note: in instantiation of function template specialization 'std::__1::move<WTF::SegmentedVectorIterator<JSC
::UnlinkedStructureStubInfo, 8>, JSC::UnlinkedStructureStubInfo *>' requested here
|         std::move(m_unlinkedStubInfos.begin(), m_unlinkedStubInfos.end(), m_jitCode->m_unlinkedStubInfos.begin());
|              ^

[Khem Raj]

Full log is here

http://sprunge.us/SUk8No

[Radar WebKit Bug Importer]

<rdar://problem/99775258>

[Mark Lam]

*** This bug has been marked as a duplicate of bug 245183 ***