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c-warn PATCH to silence warnings about std::byte in switch

From: Jason Merrill <jason at redhat dot com>
To: gcc-patches List <gcc-patches at gcc dot gnu dot org>
Cc: "Joseph S. Myers" <joseph at codesourcery dot com>
Date: Fri, 19 May 2017 15:31:41 -0400
Subject: c-warn PATCH to silence warnings about std::byte in switch
Authentication-results: sourceware.org; auth=none

It doesn't make sense to warn about a switch case not being an
enumerator if the enum type has no enumerators; such a type is being
used as an opaque typedef rather than a true enumerated type.  This
usage makes more sense with C++11 enums with explicitly specified
underlying type, but I don't think it's necessary to limit the patch
to that case.

Tested x86_64-pc-linux-gnu, applying to trunk.

Attachment: byte-case.diff
Description: Text document

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