commit 16e87a2f3ebc26df27546fff469655628e7d48a9
author Louis Dionne <ldionne@apple.com> Mon Jul 22 16:24:48 2019 +0000
committer Louis Dionne <ldionne@apple.com> Mon Jul 22 16:24:48 2019 +0000
tree 9745cdaacaa30783331bb0dd685796126a723cd9
parent 3826bf7c108ad86b657bcae28b3accc17070d7c8

[libc++] Do not infer support for C++17 in GCC < 7

libc++'s lit configuration infers the C++ language dialect when it is
not provided by checking which -std= flags that a compiler supports.
GCC 5 and GCC 6 have a -std=c++17 flag, however, they do not have full
C++17 support. The lit configuration has hardcoded logic that removes
-std=c++1z as an option to test for GCC < 7, but not -std=c++17.

This leads to a bunch of failures when running libc++ tests with GCC 5
or GCC 6. This patch adds -std=c++17 to the list of flags that are
discarded for GCC < 7 by lit's language dialect inference.

Thanks to Bryce Adelstein Lelbach for the patch.

Differential Revision: https://reviews.llvm.org/D62874

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@366700 91177308-0d34-0410-b5e6-96231b3b80d8