/Zc:alignedNew- compiler option results in an intellisense command line error: "invalid option: --no_overaligned_allocation

[neerajsi-msft]

Environment

• OS and Version: Windows 23532.1001.amd64fre.ni_moment_liof.230819-1700
• VS Code Version: 1.81.1
• C/C++ Extension Version: v1.17.4

Bug Summary and Steps to Reproduce

Bug Summary:
/Zc:alignedNew- is not being translated correctly for the intellisense frontend. We're getting a command line error.

Steps to reproduce:

1. I created a simple hello-world console application in VS2022.
2. I opened the folder in VSCode with the C++ extension
3. In the C++ extension settings I adjusted the arguments setting:
   "C_Cpp.default.compilerArgs": [
   "/Zc:alignedNew-"
   ]
4. Observe this in the "Problems" pane reported by the C++ extension:
   command-line error: invalid option: --no_overaligned_allocation

This is mimicking an error I am seeing in the Windows Razzle build environment for some projects that pass the /Zc:alignedNew- flag.

Expected behavior:
Intellisense should be able to parse my file successfully even if I pass "/Zc:alignedNew-".

Configuration and Logs

"C_Cpp.default.compilerArgs": [
  "/Zc:alignedNew-"
]

Other Extensions

No response

Additional context

No response

[sean-mcmanus]

@neerajsi-msft Downgrading to 1.16.3 is the recommended workaround until we can get a fix into 1.17.5.

[sean-mcmanus]

Fixed with https://github.com/microsoft/vscode-cpptools/releases/tag/v1.17.5 .