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From: Jakub Jelinek <>
To: Jason Merrill <>
Cc: gcc-patches List <>
Subject: Re: C++ PATCH to -Wunused with C++17 structured bindings
Date: Wed, 24 May 2017 06:52:00 -0000	[thread overview]
Message-ID: <20170524064853.GY8499@tucnak> (raw)
In-Reply-To: <>

On Tue, May 23, 2017 at 09:45:10PM -0400, Jason Merrill wrote:
> 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.

So, shall we have even for the tuple structured bindings somewhere (in
lang_decl, such as adding struct lang_decl_decomp that would include
lang_decl_min?) the tree for the underlying artificial var decl?


  reply	other threads:[~2017-05-24  6:49 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-05-24  2:23 Jason Merrill
2017-05-24  6:52 ` Jakub Jelinek [this message]
2017-05-24 16:19   ` Jason Merrill
2017-05-25 14:23     ` [C++ PATCH] Fix " Jakub Jelinek
2017-05-25 19:08       ` Jason Merrill

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