Recent chromium clangd issue

Atharv Maan

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Dec 11, 2025, 5:07:36 AM (7 days ago) Dec 11

to Clang maintainers

Hey,
Something happened to the clangd binary supplied with chromium when I synced to main last week.

I'm getting errors similar to below in almost all files. I have tried regenerating the compile commands json and redownloading clangd as well (from gclient).

Let me know how I can help you assess this further.

Thanks,

Atharv

Atharv Maan

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Dec 11, 2025, 5:07:40 AM (7 days ago) Dec 11

to Clang maintainers

Adding this to my %localappdata%\clangd\config.yaml fixed the errors. Apparently clangd somehow switched to C++14 mode and this overrides that to C++20.

CompileFlags:
Add: [/std:c++20, /Zc:__cplusplus]

Thanks,

Atharv Maan

Hans Wennborg

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Dec 11, 2025, 7:23:05 AM (7 days ago) Dec 11

to Atharv Maan, Clang maintainers

Glad to hear that it's working.

I wonder what changed though. We haven't updated clangd in the last couple of weeks (November 17). Or did you sync from an older revision?

Chromium did move (most parts) to c++23 recently: https://chromium-review.googlesource.com/c/chromium/src/+/7170560 Maybe that could be related somehow?