r261297 - Implement the likely resolution of core issue 253.

[Nico Weber via cfe-commits]

If you merge this, you also need to merge the small follow up "r261301 -
Fix SemaTemplate/instantiate-field.cpp after r261297."
On Feb 19, 2016 11:26 AM, "Hans Wennborg via cfe-commits" <
cfe-commits at lists.llvm.org> wrote:

> On Fri, Feb 19, 2016 at 4:00 AM, Ismail Donmez via cfe-commits
> <cfe-commits at lists.llvm.org> wrote:
> > On Fri, Feb 19, 2016 at 3:52 AM, Nico Weber via cfe-commits
> > <cfe-commits at lists.llvm.org> wrote:
> >> Author: nico
> >> Date: Thu Feb 18 19:52:46 2016
> >> New Revision: 261297
> >>
> >> URL: http://llvm.org/viewvc/llvm-project?rev=261297&view=rev
> >> Log:
> >> Implement the likely resolution of core issue 253.
> >>
> >> C++11 requires const objects to have a user-provided constructor, even
> for
> >> classes without any fields. DR 253 relaxes this to say "If the implicit
> default
> >> constructor initializes all subobjects, no initializer should be
> required."
> >>
> >> clang is currently the only compiler that implements this C++11 rule,
> and e.g.
> >> libstdc++ relies on something like DR 253 to compile in newer
> versions.  This
> >> change  makes it possible to build code that says `const vector<int>
> v;' again
> >> when using libstdc++5.2 and _GLIBCXX_DEBUG
> >> (https://gcc.gnu.org/bugzilla/show_bug.cgi?id=60284).
> >>
> >> Fixes PR23381.
> >
> > Since nearly all Linux distros now ship gcc5, it would be nice to have
> > this fix in 3.8 release.
>
> Richard, what do you think?
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