[libcxx] r292607 - Don't default older GCC's to C++17, but C++14 or C++11 instead

[Eric Fiselier via cfe-commits]

We should merge this patch into the 4.0 release branch. It is needed to
make "check-all" pass when using GCC 4, 5 and 6.

/Eric

On Fri, Jan 20, 2017 at 5:54 AM, Eric Fiselier via cfe-commits <
cfe-commits at lists.llvm.org> wrote:

> Author: ericwf
> Date: Fri Jan 20 06:54:45 2017
> New Revision: 292607
>
> URL: http://llvm.org/viewvc/llvm-project?rev=292607&view=rev
> Log:
> Don't default older GCC's to C++17, but C++14 or C++11 instead
>
> Modified:
>     libcxx/trunk/test/libcxx/test/config.py
>
> Modified: libcxx/trunk/test/libcxx/test/config.py
> URL: http://llvm.org/viewvc/llvm-project/libcxx/trunk/test/
> libcxx/test/config.py?rev=292607&r1=292606&r2=292607&view=diff
> ============================================================
> ==================
> --- libcxx/trunk/test/libcxx/test/config.py (original)
> +++ libcxx/trunk/test/libcxx/test/config.py Fri Jan 20 06:54:45 2017
> @@ -423,6 +423,15 @@ class Configuration(object):
>          if not std:
>              # Choose the newest possible language dialect if none is
> given.
>              possible_stds = ['c++1z', 'c++14', 'c++11', 'c++03']
> +            if self.cxx.type == 'gcc':
> +                maj_v, _, _ = self.cxx.version
> +                maj_v = int(maj_v)
> +                if maj_v < 7:
> +                    possible_stds.remove('c++1z')
> +                # FIXME: How many C++14 tests actually fail under GCC 5
> and 6?
> +                # Should we XFAIL them individually instead?
> +                if maj_v <= 6:
> +                    possible_stds.remove('c++14')
>              for s in possible_stds:
>                  if self.cxx.hasCompileFlag('-std=%s' % s):
>                      std = s
>
>
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