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C++ PATCH for c++/17729, c++/50308, deprecated warning issues

From: Jason Merrill <jason at redhat dot com>
To: gcc-patches List <gcc-patches at gcc dot gnu dot org>
Date: Tue, 21 Feb 2017 12:48:43 -0800
Subject: C++ PATCH for c++/17729, c++/50308, deprecated warning issues
Authentication-results: sourceware.org; auth=none

Both of these PRs are problems with the attribute deprecated warning
in cases when there are no other declarations of the name in scope.
[basic.def.odr] says that a function is odr-used if it is the unique
result of name lookup, and also if it is selected by overload
resolution; in 17729 that results in a duplicate warning, and in 50308
in a bogus warning because a different function is chosen by
arg-dependent lookup.

The solution for these is to avoid calling mark_used on the lookup
when we know we're building a call.

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

Attachment: 17729.diff
Description: Text document

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