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[cmake] Enable -Werror=return-type

Authored by kastiglione on Mar 8 2021, 5:06 PM.



Turn -Wreturn-type into an error.

This is currently used by libcxx, libcxxabi, and libunwind, and would be a good default
for all of llvm. I'm not aware of any cases where this shouldn't be an error. This
ensures different build configs, merges, and downstream branches catch issues sooner.

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kastiglione created this revision.Mar 8 2021, 5:06 PM
kastiglione requested review of this revision.Mar 8 2021, 5:06 PM
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This revision is now accepted and ready to land.Mar 9 2021, 9:21 AM
vsk accepted this revision.Mar 9 2021, 9:34 AM
This revision was automatically updated to reflect the committed changes.
kastiglione added a comment.EditedMar 10 2021, 2:50 PM

Reverted because some versions of gcc can emit -Wreturn-type warnings on functions that have exhaustive switches over enums. A fix is to use llvm_unreachable but that's not currently done everywhere (and also seems like a poor/unnecessary practice).

Can you either enable it for Clang or fix llvm codebase so GCC is ok with it?

@xbolva00 yes I plan to do that. I'll quickly check into the gcc situation first, and but may just re-enable it for clang.