[PATCH] D112921: [clang] Enable sized deallocation by default in C++14 onwards

Mon Apr 25 20:30:38 PDT 2022

pcwang-thead added a comment.

In D112921#3473022 <https://reviews.llvm.org/D112921#3473022>, @ldionne wrote:

> (BTW I strongly support this patch, I just think we should do it properly on all platforms from the start :-)

I couldn't agree with you more, but I have no idea how to implement it. :-(

In D112921#3473080 <https://reviews.llvm.org/D112921#3473080>, @rjmccall wrote:

> Ideally, I think, we would set this up to work something like `ObjCRuntime`, where we're making queries to a common place that contains all the information necessary to decide what runtime features are available.  In particular, we shouldn't treat Apple platforms as forever unique in providing a stable runtime interface with availability gating.
>
> Now, we don't necessarily need the same complexity that `ObjCRuntime` supports, where the user can tell us to use a different runtime and runtime version from the default for the platform.  On the other hand, maybe we want that, because it's a good way to deal with the compatibility problem that we have on non-Apple platforms.  Users could tell us that they're targeting e.g. libsupc++ v4.8, and we could tell them in response that sized allocation isn't supported.  And if we get them to tell us that, rather than "I have sized allocation support" specifically, it sets us up well to solve similar problems in the future.

You mean that we may provide a option `-fc++-runtime` likes `-fobjc-runtime`, or extend `-stdlib` to specify version number in the form of  `-stdlib=libsupc++-v4.8`?

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https://reviews.llvm.org/D112921