[llvm-dev] Using C++14 code in LLVM

[Philip Reames via llvm-dev]

On 10/03/2016 03:40 AM, Antoine Pitrou via llvm-dev wrote:
> On Mon, 3 Oct 2016 09:30:08 +0200
> serge guelton via llvm-dev <llvm-dev at lists.llvm.org> wrote:
>> On Mon, Oct 03, 2016 at 09:04:15AM +0200, Joerg Sonnenberger via llvm-dev wrote:
>>> On Sun, Oct 02, 2016 at 11:09:08PM +0000, Zachary Turner via llvm-dev wrote:
>>>> The BSDs don't seem as much of an issue.  FreeBSD 10 and 11 both have LLVM
>>>> 3.9 and GCC 4.9.  NetBSD 6.1.5 and 7.0 both have GCC 5.3 and LLVM 3.8.
>>>> Open BSD has a very old GCC, but distrowatch claims that it also has LLVM
>>>> 3.8.
>>> NetBSD 6.1.5 has GCC 4.5 in base, 7.0 has 4.8. Clang is not included the
>>> default for either.
>> Another feedback from a downstream user: in order to build our
>> llvm-based compiler once and have it run on a large variety of Linux
>> machines, we're using ubuntu trusty as build environment, which has
>> the nice property of using a rather old GLIBC version. Ubuntu trusty
>> ships by default with g++-4.8.
> We use CentOS 5 for the same reason.  The compiler is gcc 4.8.2, coming
> from the Developer Toolset 2.
>
> Bumping C++ requirements to C++14 may force us to switch our build
> machine to CentOS 6, and abandon support for users of older versions of
> RHEL and CentOS.
We have a similar setup and would have similar problems, but at a 
slightly later gcc version.  We're currently using gcc-4.9.2.  We could 
probably work around this, but I'd really rather not do so unless 
there's a good reason.

(I know the current discussion is around moving to 4.9 as a baseline.  
We'd be fine with this, I'm mostly chiming in since 5.2 was mentioned 
earlier in the thread and that would be a problem.)

Philip