[llvm-bugs] [Bug 39592] New: A `[system]` module built with `-Wdelete-non-virtual-dtor` can't suppress this warning in importers

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=39592

            Bug ID: 39592
           Summary: A `[system]` module built with
                    `-Wdelete-non-virtual-dtor` can't suppress this
                    warning in importers
           Product: clang
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Modules
          Assignee: unassignedclangbugs at nondot.org
          Reporter: andrewjcg at gmail.com
                CC: dgregor at apple.com, llvm-bugs at lists.llvm.org,
                    richard-llvm at metafoo.co.uk

I'm actually not entirely sure this is a bug, so apologies for the noise if
not.

If a module with the `[system]` attribute is built with
`-Wdelete-non-virtual-dtor`, any importers/users that use a templated function
that would otherwise trigger that warning cannot suppress it (despite building
with `-w` and despite the module being marked as `[system]`).

That said, it seems a straightforward fix is not using warnings when compiling
modules you're tagging with `[system]`, however, `[system]` appears to mute
other warnings even when applied to the module build (e.g. `-Wunused`).

Simplified repro is https://reviews.llvm.org/differential/diff/173210/.

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