Incompatibility between WebView2EnvironmentOptions.h and Qt 6 includes

[bassengejp]

Affected versions:

WebView2 SDK version 3179.45 and following

Context:

I am developing a WebView2 based C++ application built with VS2022 that also uses Qt 6 as dependency. For integration of the WebView2 dependencies, I am using the provided WebView2 SDK files included in the nuget package by unzipping the package and directly referencing the depencies in our custom CI build chain, i.e. I do not manually add the nuget package to VS2022.

Problem:

Since update of the WebView2 SDK to 3179.45, the preprocessor macro

#if defined(__has_attribute)
  __attribute__((annotate("raw_ptr_exclusion")))
#endif

in WebView2EnvironmentOptions.h causes the project to fail with build error C2059: syntax error: '(' on the __attribute__ statement.

The root cause appears to be that __has_attribute is defined by qcompilerdetection.h for the Qt 6 library. In conclusion, WebView2 and Qt 6 do not seem to be straight away compatible for including the header files in the same source code files.

Questions:

• Am I missing here something, in the sense that __has_attribute should have been configured somewhere when including the WebView2 SDK?
• Should the __attribute__ statement be compiling, or is the syntax error to be expected?
• Are there plans to remove the __attribute__((annotate("raw_ptr_exclusion"))) section in future WebView2 SDK releases?

Possible workarounds:

• use WebView2 SDK version 3124.44 which does not contain the __attribute__((annotate("raw_ptr_exclusion"))) section.
• #undef __has_attribute before including WebView2EnvironmentOptions.h
• split source code into different files that only depend on Qt 6 / WebView2 respectively