JDK-8367578, which pulled in additional WebKit 622.1 fixes from WebKitGTK 2.48.7, fails to build on 32-bit Windows and Linux. The 64-bit builds are fine, which is why we didn't discover it prior to integration.

======================================================================================================================

Linux build failure
-------------------

[ 20%] Building CXX object Source/JavaScriptCore/CMakeFiles/LowLevelInterpreterLib.dir/llint/LowLevelInterpreter.cpp.o
jfx/modules/web/src/main/native/Source/JavaScriptCore/llint/LowLevelInterpreter.cpp: In static member function 'static JSC::JSValue JSC::LLInt::CLoop::execute(JSC::OpcodeID, void*, JSC::VM*, JSC::ProtoCallFrame*, bool)':
jfx/modules/web/build/linux/JavaScriptCore/DerivedSources/Bytecodes.h:989:11: error: label 'op_instanceof_return_location' used but not defined
  989 | macro(op_instanceof_return_location, 0) \
      | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
jfx/modules/web/src/main/native/Source/JavaScriptCore/llint/LowLevelInterpreter.cpp:264:58: note: in definition of macro 'OPCODE_ENTRY'
  264 | opcodeMap[__opcode] = std::bit_cast<void*>(&&__opcode); \
      | ^~~~~~~~
jfx/modules/web/src/main/native/Source/JavaScriptCore/llint/LowLevelInterpreter.cpp:282:9: note: in expansion of macro 'FOR_EACH_BYTECODE_HELPER_ID'
  282 | FOR_EACH_BYTECODE_HELPER_ID(OPCODE_ENTRY)
      | ^~~~~~~~~~~~~~~~~~~~~~~~~~~
jfx/modules/web/build/linux/JavaScriptCore/DerivedSources/Bytecodes.h:989:11: error: label 'op_instanceof_return_location_wide16' used but not defined
  989 | macro(op_instanceof_return_location, 0) \
      | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
jfx/modules/web/src/main/native/Source/JavaScriptCore/llint/LowLevelInterpreter.cpp:265:64: note: in definition of macro 'OPCODE_ENTRY'
  265 | opcodeMapWide16[__opcode] = std::bit_cast<void*>(&&__opcode##_wide16); \
      | ^~~~~~~~
jfx/modules/web/src/main/native/Source/JavaScriptCore/llint/LowLevelInterpreter.cpp:282:9: note: in expansion of macro 'FOR_EACH_BYTECODE_HELPER_ID'
  282 | FOR_EACH_BYTECODE_HELPER_ID(OPCODE_ENTRY)
      | ^~~~~~~~~~~~~~~~~~~~~~~~~~~
jfx/modules/web/build/linux/JavaScriptCore/DerivedSources/Bytecodes.h:989:11: error: label 'op_instanceof_return_location_wide32' used but not defined
  989 | macro(op_instanceof_return_location, 0) \
      | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
jfx/modules/web/src/main/native/Source/JavaScriptCore/llint/LowLevelInterpreter.cpp:266:64: note: in definition of macro 'OPCODE_ENTRY'
  266 | opcodeMapWide32[__opcode] = std::bit_cast<void*>(&&__opcode##_wide32);
      | ^~~~~~~~
jfx/modules/web/src/main/native/Source/JavaScriptCore/llint/LowLevelInterpreter.cpp:282:9: note: in expansion of macro 'FOR_EACH_BYTECODE_HELPER_ID'
  282 | FOR_EACH_BYTECODE_HELPER_ID(OPCODE_ENTRY)
      | ^~~~~~~~~~~~~~~~~~~~~~~~~~~
gmake[2]: *** [Source/JavaScriptCore/CMakeFiles/LowLevelInterpreterLib.dir/build.make:112: Source/JavaScriptCore/CMakeFiles/LowLevelInterpreterLib.dir/llint/LowLevelInterpreter.cpp.o] Error 1
gmake[1]: *** [CMakeFiles/Makefile2:558: Source/JavaScriptCore/CMakeFiles/LowLevelInterpreterLib.dir/all] Error 2
gmake: *** [Makefile:111: all] Error 2

> Task :web:compileNativeLinux FAILED

======================================================================================================================

Windows build failure
---------------------

On Windows, we get several warnings of the following type:

jfx\modules\web\src\main\native\Source\JavaScriptCore\runtime\MathCommon.h(387,1): warning: 'sysv_abi' calling convention is not supported for this target [-Wignored-attributes]
  387 | JSC_DECLARE_NOEXCEPT_JIT_OPERATION(i32_div_u, uint32_t, (uint32_t, uint32_t));
      | ^
jfx\modules\web\src\main\native\Source\JavaScriptCore\jit\OperationResult.h(287,82): note: expanded from macro 'JSC_DECLARE_NOEXCEPT_JIT_OPERATION'
  287 | #define JSC_DECLARE_NOEXCEPT_JIT_OPERATION(functionName, returnType, parameters) JSC_DECLARE_JIT_OPERATION_IMPL(functionName, returnType, parameters)
      | ^
jfx\modules\web\build\win\WTF\Headers\wtf/PlatformCallingConventions.h(135,5): note: expanded from macro 'JSC_DECLARE_JIT_OPERATION_IMPL'
  135 | JSC_DECLARE_JIT_OPERATION_WITH_ATTRIBUTES_IMPL(functionName, , returnType, parameters)
      | ^
jfx\modules\web\build\win\WTF\Headers\wtf/PlatformCallingConventions.h(131,38): note: expanded from macro 'JSC_DECLARE_JIT_OPERATION_WITH_ATTRIBUTES_IMPL'
  131 | extern "C" attributes returnType JIT_OPERATION_ATTRIBUTES functionName parameters REFERENCED_FROM_ASM WTF_INTERNAL; \
      | ^
jfx\modules\web\build\win\WTF\Headers\wtf/PlatformCallingConventions.h(84,34): note: expanded from macro 'JIT_OPERATION_ATTRIBUTES'
   84 | #define JIT_OPERATION_ATTRIBUTES SYSV_ABI
      | ^
jfx\modules\web\build\win\WTF\Headers\wtf/PlatformCallingConventions.h(37,33): note: expanded from macro 'SYSV_ABI'
   37 | #define SYSV_ABI __attribute__((sysv_abi))
      | ^

And then failures:

jfx\modules\web\src\main\native\Source\JavaScriptCore\llint\LowLevelInterpreter.cpp(282,9): error: use of undeclared label 'op_instanceof_return_location'
  282 | FOR_EACH_BYTECODE_HELPER_ID(OPCODE_ENTRY)
      | ^
jfx\modules\web\build\win\JavaScriptCore\DerivedSources\Bytecodes.h(989,11): note: expanded from macro 'FOR_EACH_BYTECODE_HELPER_ID'
  989 | macro(op_instanceof_return_location, 0) \
      | ^
jfx\modules\web\src\main\native\Source\JavaScriptCore\llint\LowLevelInterpreter.cpp(282,37): error: use of undeclared label 'op_instanceof_return_location_wide16'
  282 | FOR_EACH_BYTECODE_HELPER_ID(OPCODE_ENTRY)
      | ^
jfx\modules\web\src\main\native\Source\JavaScriptCore\llint\LowLevelInterpreter.cpp(282,37): error: use of undeclared label 'op_instanceof_return_location_wide32'
316 warnings and 3 errors generated.
ninja: build stopped: subcommand failed.

> Task :web:compileNativeWin FAILED