dev-qt/qtwebengine: fix compiling with clang-16

clang-16 complains about casting an integer value that exceeds an
enumeration capacity in the class base::BitField
to not modify chromium code we just cancel warning about this
circumstance to prevent it from being converted to an error that fails
compilation

[sam: Note that this is a bandaid and won't work with Clang 17.]

Bug: https://bugs.gentoo.org/903573
Signed-off-by: Denis Pronin <dannftk@yandex.ru>
Closes: https://github.com/gentoo/gentoo/pull/31869
Signed-off-by: Sam James <sam@gentoo.org>

1 files changed, 15 insertions, 0 deletions

diff --git a/dev-qt/qtwebengine/files/qtwebengine-5.15.10_p20230623-clang16.patch b/dev-qt/qtwebengine/files/qtwebengine-5.15.10_p20230623-clang16.patch
new file mode 100644
index 000000000000..2d8f8482e1b4
--- /dev/null
+++ b/dev-qt/qtwebengine/files/qtwebengine-5.15.10_p20230623-clang16.patch
@@ -0,0 +1,15 @@
+https://bugs.gentoo.org/903573
+--- a/src/3rdparty/chromium/v8/src/base/bit-field.h
++++ b/src/3rdparty/chromium/v8/src/base/bit-field.h
+@@ -39,8 +39,11 @@
+   static constexpr int kLastUsedBit = kShift + kSize - 1;
+   static constexpr U kNumValues = U{1} << kSize;
+ 
++  #pragma clang diagnostic push
++  #pragma clang diagnostic ignored "-Wenum-constexpr-conversion"
+   // Value for the field with all bits set.
+   static constexpr T kMax = static_cast<T>(kNumValues - 1);
++  #pragma clang diagnostic pop
+ 
+   template <class T2, int size2>
+   using Next = BitField<T2, kShift + kSize, size2, U>;