[PATCH] D71579: [driver][darwin] Pass -platform_version flag to the linker instead of the -<platform>_version_min flag

[Alex Lorenz via Phabricator via llvm-commits]

arphaman created this revision.
arphaman added reviewers: steven_wu, dexonsmith.
Herald added subscribers: llvm-commits, ributzka, jkorous.
Herald added projects: clang, LLVM.

In Xcode 11, ld added a new flag called `-platform_version` that can be used instead of the old `-<platform>_version_min` flags. The new flag allows Clang to pass the SDK version from the driver to the linker.
This patch adopts the new `-platform_version` flag in Clang, and starts using it by default, unless a linker version < 520 is passed to the driver.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D71579

Files:
  clang/lib/Driver/ToolChains/Darwin.cpp
  clang/lib/Driver/ToolChains/Darwin.h
  clang/test/Driver/Inputs/WatchOS6.0.sdk/SDKSettings.json
  clang/test/Driver/Inputs/iPhoneOS13.0.sdk/SDKSettings.json
  clang/test/Driver/darwin-infer-simulator-sdkroot.c
  clang/test/Driver/darwin-ld-platform-version-ios.c
  clang/test/Driver/darwin-ld-platform-version-macos.c
  clang/test/Driver/darwin-ld-platform-version-tvos.c
  clang/test/Driver/darwin-ld-platform-version-watchos.c
  clang/test/Driver/darwin-ld.c
  clang/test/Driver/darwin-sdkroot.c
  clang/test/Driver/target-triple-deployment.c
  llvm/include/llvm/Support/VersionTuple.h

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