www/qt5-webengine: fix build with libc++ 17

Building www/qt5-webengine with libc++ 17 results in the following
compile errors:

  In file included from ../../../../kde-qtwebengine-5.15.15p0/src/3rdparty/chromium/third_party/perfetto/src/trace_processor/trace_sorter.cc:17:
  In file included from /usr/include/c++/v1/algorithm:1803:
  In file included from /usr/include/c++/v1/__algorithm/nth_element.h:15:
  /usr/include/c++/v1/__algorithm/sort.h:577:14: error: no viable overloaded '='
    577 |     *__begin = _Ops::__iter_move(__pivot_pos);
        |     ~~~~~~~~ ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  /usr/include/c++/v1/__algorithm/sort.h:802:20: note: in instantiation of function template specialization 'std::__bitset_partition<std::_ClassicAlgPolicy, perfetto::base::CircularQueue<perfetto::trace_processor::TimestampedTracePiece>::Iterator, std::__less<void, void> &>' requested here
    802 |             ? std::__bitset_partition<_AlgPolicy, _RandomAccessIterator, _Compare>(__first, __last, __comp)
        |                    ^
  /usr/include/c++/v1/__algorithm/sort.h:878:8: note: in instantiation of function template specialization 'std::__introsort<std::_ClassicAlgPolicy, std::__less<void, void> &, perfetto::base::CircularQueue<perfetto::trace_processor::TimestampedTracePiece>::Iterator, false>' requested here
    878 |   std::__introsort<_AlgPolicy,
        |        ^
  /usr/include/c++/v1/__algorithm/sort.h:946:10: note: in instantiation of function template specialization 'std::__sort_dispatch<std::_ClassicAlgPolicy, perfetto::base::CircularQueue<perfetto::trace_processor::TimestampedTracePiece>::Iterator, std::__less<void, void>>' requested here
    946 |     std::__sort_dispatch<_AlgPolicy>(std::__unwrap_iter(__first), std::__unwrap_iter(__last), __comp);
        |          ^
  /usr/include/c++/v1/__algorithm/sort.h:954:8: note: in instantiation of function template specialization 'std::__sort_impl<std::_ClassicAlgPolicy, perfetto::base::CircularQueue<perfetto::trace_processor::TimestampedTracePiece>::Iterator, std::__less<void, void>>' requested here
    954 |   std::__sort_impl<_ClassicAlgPolicy>(std::move(__first), std::move(__last), __comp);
        |        ^
  /usr/include/c++/v1/__algorithm/sort.h:960:8: note: in instantiation of function template specialization 'std::sort<perfetto::base::CircularQueue<perfetto::trace_processor::TimestampedTracePiece>::Iterator, std::__less<void, void>>' requested here
    960 |   std::sort(__first, __last, __less<>());
        |        ^
  ../../../../kde-qtwebengine-5.15.15p0/src/3rdparty/chromium/third_party/perfetto/src/trace_processor/trace_sorter.cc:51:8: note: in instantiation of function template specialization 'std::sort<perfetto::base::CircularQueue<perfetto::trace_processor::TimestampedTracePiece>::Iterator>' requested here
     51 |   std::sort(sort_begin, events_.end());
        |        ^
  ../../../../kde-qtwebengine-5.15.15p0/src/3rdparty/chromium/third_party/perfetto/src/trace_processor/timestamped_trace_piece.h:191:26: note: candidate function not viable: 'this' argument has type 'const perfetto::trace_processor::TimestampedTracePiece', but method is not marked const
    191 |   TimestampedTracePiece& operator=(TimestampedTracePiece&& ttp) {
        |                          ^
  ../../../../kde-qtwebengine-5.15.15p0/src/3rdparty/chromium/third_party/perfetto/src/trace_processor/timestamped_trace_piece.h:202:26: note: candidate function not viable: 'this' argument has type 'const perfetto::trace_processor::TimestampedTracePiece', but method is not marked const
    202 |   TimestampedTracePiece& operator=(const TimestampedTracePiece&) = delete;
        |                          ^

This is because perfetto's CircularQueue template is only half
const-correct. Upstream fixed this in:

https://github.com/google/perfetto/commit/b82a213bcf71dd8e68b53941375936c7905c0ff2

so apply that fix to qt5-webengine's older copy of perfetto.

PR:		274740, 273753
MFH:		2023Q4

1 files changed, 35 insertions, 0 deletions

diff --git a/www/qt5-webengine/files/patch-src_3rdparty_chromium_third__party_perfetto_include_perfetto_ext_base_circular__queue.h b/www/qt5-webengine/files/patch-src_3rdparty_chromium_third__party_perfetto_include_perfetto_ext_base_circular__queue.h
new file mode 100644
index 000000000000..227cbf7dfcfd
--- /dev/null
+++ b/www/qt5-webengine/files/patch-src_3rdparty_chromium_third__party_perfetto_include_perfetto_ext_base_circular__queue.h
@@ -0,0 +1,35 @@
+--- src/3rdparty/chromium/third_party/perfetto/include/perfetto/ext/base/circular_queue.h.orig	2023-07-14 13:25:01 UTC
++++ src/3rdparty/chromium/third_party/perfetto/include/perfetto/ext/base/circular_queue.h
+@@ -67,25 +67,21 @@ class CircularQueue {
+       ignore_result(generation);
+     }
+ 
+-    T* operator->() {
++    Iterator(const Iterator&) noexcept = default;
++    Iterator& operator=(const Iterator&) noexcept = default;
++    Iterator(Iterator&&) noexcept = default;
++    Iterator& operator=(Iterator&&) noexcept = default;
++
++    T* operator->() const {
+ #if PERFETTO_DCHECK_IS_ON()
+       PERFETTO_DCHECK(generation_ == queue_->generation());
+ #endif
+       return queue_->Get(pos_);
+     }
+ 
+-    const T* operator->() const {
+-      return const_cast<CircularQueue<T>::Iterator*>(this)->operator->();
+-    }
++    T& operator*() const { return *(operator->()); }
+ 
+-    T& operator*() { return *(operator->()); }
+-    const T& operator*() const { return *(operator->()); }
+-
+     value_type& operator[](difference_type i) { return *(*this + i); }
+-
+-    const value_type& operator[](difference_type i) const {
+-      return const_cast<CircularQueue<T>::Iterator&>(*this)[i];
+-    }
+ 
+     Iterator& operator++() {
+       Add(1);