Respect runtime-compatibility-version flag also for dynamic replacement compatibility library

rdar://56259688

Author: aschwaighofer

lib/Frontend/CompilerInvocation.cpp

@@ -1228,8 +1228,24 @@ static bool ParseIRGenArgs(IRGenOptions &Opts, ArgList &Args,
 
   if (!Args.hasArg(options::
           OPT_disable_autolinking_runtime_compatibility_dynamic_replacements)) {
+    Optional<llvm::VersionTuple> runtimeCompatibilityVersion;
+    if (auto versionArg =
+            Args.getLastArg(options::OPT_runtime_compatibility_version)) {
+      auto version = StringRef(versionArg->getValue());
+      if (version.equals("none")) {
+        runtimeCompatibilityVersion = None;
+      } else if (version.equals("5.0")) {
+        runtimeCompatibilityVersion = llvm::VersionTuple(5, 0);
+      } else {
+        Diags.diagnose(SourceLoc(), diag::error_invalid_arg_value,
+                       versionArg->getAsString(Args), version);
+      }
+    } else {
+      runtimeCompatibilityVersion =
+          getSwiftRuntimeCompatibilityVersionForTarget(Triple);
+    }
     Opts.AutolinkRuntimeCompatibilityDynamicReplacementLibraryVersion =
-        getSwiftRuntimeCompatibilityVersionForTarget(Triple);
+        runtimeCompatibilityVersion;
   }
   return false;
 }

test/IRGen/autolink-runtime-compatibility.swift

@@ -5,10 +5,10 @@
 // RUN: %target-swift-frontend -disable-autolinking-runtime-compatibility-dynamic-replacements -runtime-compatibility-version 5.0 -disable-autolinking-runtime-compatibility -emit-ir -parse-stdlib %s | %FileCheck -check-prefix=NO-FORCE-LOAD %s
 
 // Doesn't autolink compatibility library because runtime compatibility library is disabled
-// RUN: %target-swift-frontend -disable-autolinking-runtime-compatibility-dynamic-replacements -runtime-compatibility-version none -emit-ir -parse-stdlib %s | %FileCheck -check-prefix=NO-FORCE-LOAD %s
+// RUN: %target-swift-frontend -runtime-compatibility-version none -emit-ir -parse-stdlib %s | %FileCheck -check-prefix=NO-FORCE-LOAD %s
 
 // Doesn't autolink compatibility library because target OS doesn't need it
-// RUN: %target-swift-frontend -disable-autolinking-runtime-compatibility-dynamic-replacements -target x86_64-apple-macosx10.24 -emit-ir -parse-stdlib %s | %FileCheck -check-prefix=NO-FORCE-LOAD %s
+// RUN: %target-swift-frontend -target x86_64-apple-macosx10.24 -emit-ir -parse-stdlib %s | %FileCheck -check-prefix=NO-FORCE-LOAD %s
 
 // Autolinks because compatibility library was explicitly asked for
 // RUN: %target-swift-frontend -runtime-compatibility-version 5.0 -emit-ir -parse-stdlib %s | %FileCheck -check-prefix=FORCE-LOAD %s
@@ -18,8 +18,11 @@ public func foo() {}
 
 // NO-FORCE-LOAD-NOT: FORCE_LOAD
 // NO-FORCE-LOAD-NOT: !{!"-lswiftCompatibility50"}
+// NO-FORCE-LOAD-NOT: !{!"-lswiftCompatibilityDynamicReplacements"}
 
 // FORCE-LOAD: declare {{.*}} @"_swift_FORCE_LOAD_$_swiftCompatibility50"
+// FORCE-LOAD: declare {{.*}} @"_swift_FORCE_LOAD_$_swiftCompatibilityDynamicReplacements"
 
 // FORCE-LOAD-DAG: [[AUTOLINK_SWIFT_COMPAT:![0-9]+]] = !{!"-lswiftCompatibility50"}
+// FORCE-LOAD-DAG: !{!"-lswiftCompatibilityDynamicReplacements"}
 // FORCE-LOAD-DAG: !llvm.linker.options = !{{{.*}}[[AUTOLINK_SWIFT_COMPAT]]{{[,}]}}