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C++ PATCH to -Wunused with C++17 structured bindings

From: Jason Merrill <jason at redhat dot com>
To: gcc-patches List <gcc-patches at gcc dot gnu dot org>
Cc: Jakub Jelinek <jakub at redhat dot com>
Date: Tue, 23 May 2017 21:45:10 -0400
Subject: C++ PATCH to -Wunused with C++17 structured bindings
Authentication-results: sourceware.org; auth=none

Someone on IRC complained that there was no way to suppress -Wunused
on structured bindings.  It seemed to me that the way the feature
works, we shouldn't warn about the bindings individually; users need
to give each of the subobjects a name even if they're only interested
in using one of them.

So this patch switches to tracking whether the underlying aggregate
object as a whole is used; using one of the bindings will avoid any
warning.

This doesn't apply to tuple structured bindings, since in that case
the bindings are actual variables rather than aliases to subobjects.

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

Attachment: sbind-unused.diff
Description: Text document

Follow-Ups:
- Re: C++ PATCH to -Wunused with C++17 structured bindings
  - From: Jakub Jelinek

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