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[PATCH] Disable -Wctor-dtor-privacy warnings for some standard types

From: Jonathan Wakely <jwakely at redhat dot com>
To: libstdc++ at gcc dot gnu dot org, gcc-patches at gcc dot gnu dot org
Date: Fri, 14 Jun 2019 15:05:07 +0100
Subject: [PATCH] Disable -Wctor-dtor-privacy warnings for some standard types

These types are not constructible by design, so we never want warnings
for them, even with -Wsystem-headers.

	* include/experimental/type_traits (experimental::nonesuch): Use
	pragma to disable -Wctor-dtor-privacy warnings.
	* include/std/type_traits (__is_convertible_helper<From, To, false>)
	(__is_nt_convertible_helper<From, To, false>, __nonesuch): Likewise.

Tested x86_64-linux, committed to trunk.

Attachment: patch.txt
Description: Text document

Follow-Ups:
- Re: [PATCH] Disable -Wctor-dtor-privacy warnings for some standard types
  - From: Daniel Krügler

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