[PATCH] D131465: C++/ObjC++: switch to gnu++17 as the default standard

[Hans Wennborg via Phabricator via cfe-commits]

hans added a comment.

In D131465#3821701 <https://reviews.llvm.org/D131465#3821701>, @aaron.ballman wrote:

> Perhaps the simple rule we're going for is "when executed on Windows, Clang defaults to C++17 unless it is executed from a context in which an MSVC library can be detected, in which case Clang defaults to the same language standard as used by that version of MSVC"? It's a bit long-winded, but the idea being that we try to match MSVC's default when compiling against MSVC libraries and otherwise stick with the clang default.

But the last sentence is basically what we have today. When targeting windows-msvc, we try to match the behavior of the msvc version being targeted, which is in turn determined by what flags the user passes, what msvc installation is found in the environment, or the default (19.14).


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https://reviews.llvm.org/D131465