[all-commits] [llvm/llvm-project] f348d9: [Clang] Enable -Wunused-template under -Wall (#206...

[Aditya Medhane via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: f348d964af441ec454e5fc12ab1b599cfc1e7d14
      https://github.com/llvm/llvm-project/commit/f348d964af441ec454e5fc12ab1b599cfc1e7d14
  Author: Aditya Medhane <sherlockedaditya at gmail.com>
  Date:   2026-07-06 (Mon, 06 Jul 2026)

  Changed paths:
    M clang/docs/ReleaseNotes.md
    M clang/include/clang/Basic/DiagnosticGroups.td
    M clang/test/Misc/warning-wall.c
    M clang/test/SemaCXX/warn-func-not-needed.cpp
    M clang/test/SemaCXX/warn-variable-not-needed.cpp

  Log Message:
  -----------
  [Clang] Enable -Wunused-template under -Wall (#206123)

Uncomment `UnusedTemplate` in the `Unused` diagnostic group so
`-Wunused-template` becomes part of `-Wall`.

`-Wunused-template` flags unused function and variable templates with
internal linkage. In a header, such a template gives every translation
unit its own internal-linkage copy, which is a latent ODR violation
(ill-formed, no diagnostic required), so enabling this surfaces a real
class of bugs and keeps the pattern from reappearing.

### Depends on

The in-tree occurrences were cleaned up first in a series of NFC PRs
tracked by #202945. This change only builds clean once those land, so CI
will be red on any area whose cleanup is not yet merged. Remaining
prerequisites:

Approved
- #202969
- #202971
- #202973
- #202974
- #206309
- #206312

Needs to be reviewed 
- #202988
- #206308

Closes #202945

cc @AaronBallman @vgvassilev



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