No intellisense when using Clang-CL 15 with /WX

[dgehriger]

Environment

• OS and Version: Windows 10
• VS Code Version: 1.73.1
• C/C++ Extension Version: v1.13.5

Unlike previous versions, when running clang-cl.exe version 15.x as follows from a cmd.exe prompt:

clang-cl /WX /clang:-xc /clang:-E /clang:-dM nul

It outputs the following warning:

clang-cl: error: '-x c' after last input file has no effect [-Werror,-Wunused-command-line-argument]

Expected outcome is no error, and dumping of preprocessor variables.

Among other things, this prevents clang-cl 15.x from being used by Visual Studio Code's C++ extension for Intellisense.

Bug Summary and Steps to Reproduce

Use clang-cl version 15 and observe missing Intellisense

Expected behavior

Intellisense working

Code sample and Logs

N/A

Screenshots

No response

Additional context

No response

[sean-mcmanus]

Thanks for reporting this.

[dgehriger]

See also llvm/llvm-project#59307

[sean-mcmanus]

Can you remove the "/WX" argument? That is unneeded when configuring IntelliSense.

[sean-mcmanus]

We have a potential fix (just skipping the /WX which we already do for the clang equivalent -Werror).

[sean-mcmanus]

The fix is available with 1.14.0 (pre-release): https://github.com/microsoft/vscode-cpptools/releases/tag/v1.14.0