[all-commits] [llvm/llvm-project] f670c5: Add a new frontend flag `-fswift-async-fp={auto|al...

[Arnold Schwaighofer via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: f670c5aeeef09cd7b88e72cf8c1f2505d044a8ea
      https://github.com/llvm/llvm-project/commit/f670c5aeeef09cd7b88e72cf8c1f2505d044a8ea
  Author: Arnold Schwaighofer <aschwaighofer at apple.com>
  Date:   2021-09-16 (Thu, 16 Sep 2021)

  Changed paths:
    M clang/include/clang/Basic/CodeGenOptions.def
    M clang/include/clang/Basic/CodeGenOptions.h
    M clang/include/clang/Driver/Options.td
    M clang/lib/CodeGen/BackendUtil.cpp
    M clang/lib/Driver/ToolChains/Clang.cpp
    A clang/test/CodeGen/swift-async-extended-fp.c

  Log Message:
  -----------
  Add a new frontend flag `-fswift-async-fp={auto|always|never}`

Summary:
Introduce a new frontend flag `-fswift-async-fp={auto|always|never}`
that controls how code generation sets the Swift extended async frame
info bit. There are three possibilities:

* `auto`: which determines how to set the bit based on deployment target, either
statically or dynamically via `swift_async_extendedFramePointerFlags`.
* `always`: default, always set the bit statically, regardless of deployment
target.
* `never`: never set the bit, regardless of deployment target.

Differential Revision: https://reviews.llvm.org/D109451