clang-cl Windows builds fail to build on CI

As of at least 18/11/24, our CI has failed to build for Windows clang-cl with the following build log:

MSBuild version 17.12.6+db5f6012c for .NET Framework

  1>Checking Build System
  Building Custom Rule D:/a/unified-runtime/unified-runtime/build/_deps/googletest-src/googletest/CMakeLists.txt
  Building Custom Rule D:/a/unified-runtime/unified-runtime/source/common/CMakeLists.txt
  Building Custom Rule D:/a/unified-runtime/unified-runtime/build/content-xpti/xpti/src/CMakeLists.txt
  Building Custom Rule D:/a/unified-runtime/unified-runtime/build/_deps/googletest-src/googlemock/CMakeLists.txt
  Building Custom Rule D:/a/unified-runtime/unified-runtime/build/_deps/googletest-src/googlemock/CMakeLists.txt
  Building Custom Rule D:/a/unified-runtime/unified-runtime/build/_deps/unified-memory-framework-src/src/CMakeLists.txt
  Building Custom Rule D:/a/unified-runtime/unified-runtime/build/content-xpti/xpti/src/CMakeLists.txt
  xpti.vcxproj -> D:\a\unified-runtime\unified-runtime\build\lib\Debug\xpti.lib
  gtest.vcxproj -> D:\a\unified-runtime\unified-runtime\build\lib\Debug\gtest.lib
  ur_common.vcxproj -> D:\a\unified-runtime\unified-runtime\build\lib\Debug\ur_common.lib
  gmock.vcxproj -> D:\a\unified-runtime\unified-runtime\build\lib\Debug\gmock.lib
  Building Custom Rule D:/a/unified-runtime/unified-runtime/build/_deps/googletest-src/googletest/CMakeLists.txt
  Building Custom Rule D:/a/unified-runtime/unified-runtime/source/mock/CMakeLists.txt
  xptid.vcxproj -> D:\a\unified-runtime\unified-runtime\build\lib\Debug\xptid.lib
  Building Custom Rule D:/a/unified-runtime/unified-runtime/build/content-xptifw/xptifw/src/CMakeLists.txt
  Building Custom Rule D:/a/unified-runtime/unified-runtime/examples/collector/CMakeLists.txt
  Building Custom Rule D:/a/unified-runtime/unified-runtime/tools/urtrace/CMakeLists.txt
  Building Custom Rule D:/a/unified-runtime/unified-runtime/build/content-xptifw/xptifw/src/CMakeLists.txt
  Building Custom Rule D:/a/unified-runtime/unified-runtime/test/layers/tracing/CMakeLists.txt
  ur_mock_headers.vcxproj -> D:\a\unified-runtime\unified-runtime\build\bin\Debug\ur_mock_headers.dll
  gmock_main.vcxproj -> D:\a\unified-runtime\unified-runtime\build\lib\Debug\gmock_main.lib
  Building Custom Rule D:/a/unified-runtime/unified-runtime/tools/urtrace/CMakeLists.txt
  gtest_main.vcxproj -> D:\a\unified-runtime\unified-runtime\build\lib\Debug\gtest_main.lib
  Building Custom Rule D:/a/unified-runtime/unified-runtime/source/loader/CMakeLists.txt
  Building Custom Rule D:/a/unified-runtime/unified-runtime/test/loader/adapter_registry/CMakeLists.txt
  Building Custom Rule D:/a/unified-runtime/unified-runtime/test/loader/adapter_registry/CMakeLists.txt
  Building Custom Rule D:/a/unified-runtime/unified-runtime/test/conformance/testing/CMakeLists.txt
  Building Custom Rule D:/a/unified-runtime/unified-runtime/test/loader/adapter_registry/CMakeLists.txt
  Building Custom Rule D:/a/unified-runtime/unified-runtime/test/loader/adapter_registry/CMakeLists.txt
  Building Custom Rule D:/a/unified-runtime/unified-runtime/test/unit/logger/CMakeLists.txt
  xptifwd.vcxproj -> D:\a\unified-runtime\unified-runtime\build\bin\Debug\xptifwd.dll
  xptifw.vcxproj -> D:\a\unified-runtime\unified-runtime\build\bin\Debug\xptifw.dll
  test-logger_env_var.vcxproj -> D:\a\unified-runtime\unified-runtime\build\bin\Debug\test-logger_env_var.exe
  adapter-reg-test-prefilter.vcxproj -> D:\a\unified-runtime\unified-runtime\build\bin\Debug\adapter-reg-test-prefilter.exe
  Building Custom Rule D:/a/unified-runtime/unified-runtime/source/adapters/mock/CMakeLists.txt
  adapter-reg-test-search-with-env.vcxproj -> D:\a\unified-runtime\unified-runtime\build\bin\Debug\adapter-reg-test-search-with-env.exe
  adapter-reg-test-search-no-env.vcxproj -> D:\a\unified-runtime\unified-runtime\build\bin\Debug\adapter-reg-test-search-no-env.exe
C:\Program Files\Microsoft Visual Studio\2022\Enterprise\VC\Tools\Llvm\x64\lib\clang\18\include\stddef.h(31): warning RC4067: unexpected characters following '#if/#elif' directive; newline expected [D:\a\unified-runtime\unified-runtime\build\_deps\unified-memory-framework-build\src\umf.vcxproj]
  
C:\Program Files\Microsoft Visual Studio\2022\Enterprise\VC\Tools\Llvm\x64\lib\clang\18\include\stddef.h(31): warning RC4067: unexpected characters following '#if/#elif' directive; newline expected [D:\a\unified-runtime\unified-runtime\build\_deps\unified-memory-framework-build\src\umf.vcxproj]
  
C:\Program Files\Microsoft Visual Studio\2022\Enterprise\VC\Tools\Llvm\x64\lib\clang\18\include\__stddef_ptrdiff_t.h(15): fatal error RC1012: mismatched parenthesis : missing ' [D:\a\unified-runtime\unified-runtime\build\_deps\unified-memory-framework-build\src\umf.vcxproj]
  collector.vcxproj -> D:\a\unified-runtime\unified-runtime\build\bin\Debug\collector.dll
  ur_testing.vcxproj -> D:\a\unified-runtime\unified-runtime\build\lib\Debug\ur_testing.lib
  adapter-reg-test-search-order.vcxproj -> D:\a\unified-runtime\unified-runtime\build\bin\Debug\adapter-reg-test-search-order.exe
  ur_adapter_mock.vcxproj -> D:\a\unified-runtime\unified-runtime\build\bin\Debug\ur_adapter_mock.dll
  test_collector.vcxproj -> D:\a\unified-runtime\unified-runtime\build\bin\Debug\test_collector.dll
  ur_collector.vcxproj -> D:\a\unified-runtime\unified-runtime\build\bin\Debug\ur_collector.dll
  ur_loader.vcxproj -> D:\a\unified-runtime\unified-runtime\build\bin\Debug\ur_loader.dll
  Building Custom Rule D:/a/unified-runtime/unified-runtime/tools/urinfo/CMakeLists.txt
  Building Custom Rule D:/a/unified-runtime/unified-runtime/examples/hello_world/CMakeLists.txt
  Building Custom Rule D:/a/unified-runtime/unified-runtime/test/conformance/device/CMakeLists.txt
  Building Custom Rule D:/a/unified-runtime/unified-runtime/test/conformance/memory/CMakeLists.txt
  Building Custom Rule D:/a/unified-runtime/unified-runtime/test/conformance/adapter/CMakeLists.txt
  Building Custom Rule D:/a/unified-runtime/unified-runtime/test/layers/validation/CMakeLists.txt
  Building Custom Rule D:/a/unified-runtime/unified-runtime/test/conformance/context/CMakeLists.txt
  Building Custom Rule D:/a/unified-runtime/unified-runtime/test/layers/validation/CMakeLists.txt
  Building Custom Rule D:/a/unified-runtime/unified-runtime/test/conformance/event/CMakeLists.txt
  Building Custom Rule D:/a/unified-runtime/unified-runtime/test/layers/validation/CMakeLists.txt
  Building Custom Rule D:/a/unified-runtime/unified-runtime/test/conformance/queue/CMakeLists.txt
  Building Custom Rule D:/a/unified-runtime/unified-runtime/test/conformance/sampler/CMakeLists.txt
  Building Custom Rule D:/a/unified-runtime/unified-runtime/test/layers/validation/CMakeLists.txt
  Building Custom Rule D:/a/unified-runtime/unified-runtime/test/conformance/usm/CMakeLists.txt
  Building Custom Rule D:/a/unified-runtime/unified-runtime/test/layers/tracing/CMakeLists.txt
  hello_world.vcxproj -> D:\a\unified-runtime\unified-runtime\build\bin\Debug\hello_world.exe
  tracing-test-codeloc.vcxproj -> D:\a\unified-runtime\unified-runtime\build\bin\Debug\tracing-test-codeloc.exe
  urinfo.vcxproj -> D:\a\unified-runtime\unified-runtime\build\bin\Debug\urinfo.exe
  validation_test-parameters.vcxproj -> D:\a\unified-runtime\unified-runtime\build\bin\Debug\validation_test-parameters.exe
  validation_test-lifetime.vcxproj -> D:\a\unified-runtime\unified-runtime\build\bin\Debug\validation_test-lifetime.exe
  validation_test-leaks_mt.vcxproj -> D:\a\unified-runtime\unified-runtime\build\bin\Debug\validation_test-leaks_mt.exe
  validation_test-leaks.vcxproj -> D:\a\unified-runtime\unified-runtime\build\bin\Debug\validation_test-leaks.exe
  Building Custom Rule D:/a/unified-runtime/unified-runtime/test/conformance/virtual_memory/CMakeLists.txt
  Building Custom Rule D:/a/unified-runtime/unified-runtime/test/conformance/platform/CMakeLists.txt
  test-usm.vcxproj -> D:\a\unified-runtime\unified-runtime\build\bin\Debug\test-usm.exe
  Building Custom Rule D:/a/unified-runtime/unified-runtime/test/mock/CMakeLists.txt
  test-device.vcxproj -> D:\a\unified-runtime\unified-runtime\build\bin\Debug\test-device.exe
  test-queue.vcxproj -> D:\a\unified-runtime\unified-runtime\build\bin\Debug\test-queue.exe
  test-sampler.vcxproj -> D:\a\unified-runtime\unified-runtime\build\bin\Debug\test-sampler.exe
  test-mock.vcxproj -> D:\a\unified-runtime\unified-runtime\build\bin\Debug\test-mock.exe
  Building Custom Rule D:/a/unified-runtime/unified-runtime/test/loader/loader_lifetime/CMakeLists.txt
  Building Custom Rule D:/a/unified-runtime/unified-runtime/test/loader/platforms/CMakeLists.txt
  Building Custom Rule D:/a/unified-runtime/unified-runtime/test/unit/logger/CMakeLists.txt
  Building Custom Rule D:/a/unified-runtime/unified-runtime/test/unit/utils/CMakeLists.txt
  test-memory.vcxproj -> D:\a\unified-runtime\unified-runtime\build\bin\Debug\test-memory.exe
  Building Custom Rule D:/a/unified-runtime/unified-runtime/test/loader/loader_config/CMakeLists.txt
  Building Custom Rule D:/a/unified-runtime/unified-runtime/test/unit/utils/CMakeLists.txt
  Building Custom Rule D:/a/unified-runtime/unified-runtime/test/loader/handles/CMakeLists.txt
  Building Custom Rule D:/a/unified-runtime/unified-runtime/test/unit/utils/CMakeLists.txt
  Building Custom Rule D:/a/unified-runtime/unified-runtime/test/unit/utils/CMakeLists.txt
  test-platform.vcxproj -> D:\a\unified-runtime\unified-runtime\build\bin\Debug\test-platform.exe
  test-loader-handles.vcxproj -> D:\a\unified-runtime\unified-runtime\build\bin\Debug\test-loader-handles.exe
  test-logger.vcxproj -> D:\a\unified-runtime\unified-runtime\build\bin\Debug\test-logger.exe
  test-helpers.vcxproj -> D:\a\unified-runtime\unified-runtime\build\bin\Debug\test-helpers.exe
  test-virtual_memory.vcxproj -> D:\a\unified-runtime\unified-runtime\build\bin\Debug\test-virtual_memory.exe
  test-loader-platforms.vcxproj -> D:\a\unified-runtime\unified-runtime\build\bin\Debug\test-loader-platforms.exe
  test-getenv.vcxproj -> D:\a\unified-runtime\unified-runtime\build\bin\Debug\test-getenv.exe
  test-print.vcxproj -> D:\a\unified-runtime\unified-runtime\build\bin\Debug\test-print.exe
  test-loader-lifetime.vcxproj -> D:\a\unified-runtime\unified-runtime\build\bin\Debug\test-loader-lifetime.exe
  test-loader-config.vcxproj -> D:\a\unified-runtime\unified-runtime\build\bin\Debug\test-loader-config.exe
  test-params.vcxproj -> D:\a\unified-runtime\unified-runtime\build\bin\Debug\test-params.exe
  test-event.vcxproj -> D:\a\unified-runtime\unified-runtime\build\bin\Debug\test-event.exe
  test-context.vcxproj -> D:\a\unified-runtime\unified-runtime\build\bin\Debug\test-context.exe
  test-adapter.vcxproj -> D:\a\unified-runtime\unified-runtime\build\bin\Debug\test-adapter.exe

This looks like it was caused by an UMF update.

We should fix this issue and re-enable the build configuration.

Start with the clang-cl CI build configuration and the UMF dependency build shown in build/_deps/unified-memory-framework-build/src/umf.vcxproj; inspect the CMakeLists.txt paths in the log and the reported clang 18 header errors. Reproduce the Windows clang-cl build, identify the UMF-related cause, and confirm that the configuration is re-enabled with a passing build.