clangd and probably other linters can warn about this. False positives are possible, though: an include may very well be unused in a given build configuration, but enabled in another.
this post was submitted on 09 Nov 2023
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Never heard of such thing. I don't think that could be done correctly either. How do you detect is an include is used? Looking if it defines something? what about a conditional that can exclude the whole file unless a define is set?
usually the compiler can help here, as it knows what was needed in the code and where the definition came from, including macros. Not sure there is an open-source tol for that though, if clang-tidy does not do it.
as it was said elsewhere, when there are several configurations at play, one needs to be careful.
Eglot does this out of the box with clangd. Also no need for extra packages for clang-tidy, it's integrated with within clangd so you get both linter warnings and build errors in the flymake window.
You may have to enable more checks as it is quiet enough by default. You may also have to enable clangd-tidy integration in clangd command line as I'm not sure it is out of the box. Something like this should work:
(with-eval-after-load 'eglot
(add-to-list 'eglot-server-programs
'((c-mode c++-mode c-ts-mode c++-ts-mode c-or-c++-ts-mode)
. ("clangd"
"--clang-tidy"))))RemindMe! 24 hours