Reland "[llvm] llvm-tapi-diff"

This is relanding commit d1d36f7ad2ae82bea8a6fcc40d6c42a72e21f096 .
This patch additionally addresses failures found in buildbots due to unstable build ordering & post review comments.

This patch introduces a new tool, llvm-tapi-diff, that compares and returns the diff of two TBD files.

Reviewed By: ributzka, JDevlieghere

Differential Revision: https://reviews.llvm.org/D101835

1 files changed, 29 insertions, 0 deletions

diff --git a/llvm/lib/TextAPI/Platform.cpp b/llvm/lib/TextAPI/Platform.cpp
index 038ad9d..a2ce6d0 100644
--- a/llvm/lib/TextAPI/Platform.cpp
+++ b/llvm/lib/TextAPI/Platform.cpp
@@ -105,5 +105,34 @@ PlatformKind getPlatformFromName(StringRef Name) {
       .Default(PlatformKind::unknown);
 }
 
+std::string getOSAndEnvironmentName(PlatformKind Platform,
+                                    std::string Version) {
+  switch (Platform) {
+  case PlatformKind::unknown:
+    return "darwin" + Version;
+  case PlatformKind::macOS:
+    return "macos" + Version;
+  case PlatformKind::iOS:
+    return "ios" + Version;
+  case PlatformKind::tvOS:
+    return "tvos" + Version;
+  case PlatformKind::watchOS:
+    return "watchos" + Version;
+  case PlatformKind::bridgeOS:
+    return "bridgeos" + Version;
+  case PlatformKind::macCatalyst:
+    return "ios" + Version + "-macabi";
+  case PlatformKind::iOSSimulator:
+    return "ios" + Version + "-simulator";
+  case PlatformKind::tvOSSimulator:
+    return "tvos" + Version + "-simulator";
+  case PlatformKind::watchOSSimulator:
+    return "watchos" + Version + "-simulator";
+  case PlatformKind::driverKit:
+    return "driverkit" + Version;
+  }
+  llvm_unreachable("Unknown llvm::MachO::PlatformKind enum");
+}
+
 } // end namespace MachO.
 } // end namespace llvm.