Merge pull request #41673 from tshortli/inlining-availability-checking

Add -target-min-inlining-version to aid type checking for inlinable functions in resilient libraries

include/swift/Basic/LangOptions.h

@@ -134,6 +134,13 @@ namespace swift {
     /// The SDK canonical name, if known.
     std::string SDKName;
 
+    /// The lowest target OS version that code in this module may be inlined
+    /// into. In resilient modules, this should match the minimum
+    /// deployment target of the *first* resilient version of the module, since
+    /// clients may need to interoperate with versions as far back as that
+    /// deployment target.
+    llvm::VersionTuple MinimumInliningTargetVersion;
+
     /// The alternate name to use for the entry point instead of main.
     std::string entryPointFunctionName = "main";
 

include/swift/Basic/Platform.h

@@ -55,6 +55,9 @@ namespace swift {
   bool triplesAreValidForZippering(const llvm::Triple &target,
                                    const llvm::Triple &targetVariant);
 
+  const Optional<llvm::VersionTuple>
+  minimumABIStableOSVersionForTriple(const llvm::Triple &triple);
+
   /// Returns true if the given triple represents an OS that has all the
   /// "built-in" ABI-stable libraries (stdlib and _Concurrency)
   /// (eg. in /usr/lib/swift).