[clang][ExtractAPI] Compute inherited availability information (#103040)

Additionally this computes availability information for all platforms
ahead of possibly introducing a flag to enable this behavior.

rdar://123513706

1 files changed, 17 insertions, 14 deletions

diff --git a/clang/lib/ExtractAPI/Serialization/SymbolGraphSerializer.cpp b/clang/lib/ExtractAPI/Serialization/SymbolGraphSerializer.cpp
index 6e56ee5..84ed546 100644
--- a/clang/lib/ExtractAPI/Serialization/SymbolGraphSerializer.cpp
+++ b/clang/lib/ExtractAPI/Serialization/SymbolGraphSerializer.cpp
@@ -171,22 +171,25 @@ std::optional<Array> serializeAvailability(const AvailabilityInfo &Avail) {
     UnconditionallyDeprecated["isUnconditionallyDeprecated"] = true;
     AvailabilityArray.emplace_back(std::move(UnconditionallyDeprecated));
   }
-  Object Availability;
-
-  Availability["domain"] = Avail.Domain;
-
-  if (Avail.isUnavailable()) {
-    Availability["isUnconditionallyUnavailable"] = true;
-  } else {
-    serializeObject(Availability, "introduced",
-                    serializeSemanticVersion(Avail.Introduced));
-    serializeObject(Availability, "deprecated",
-                    serializeSemanticVersion(Avail.Deprecated));
-    serializeObject(Availability, "obsoleted",
-                    serializeSemanticVersion(Avail.Obsoleted));
+
+  if (Avail.Domain.str() != "") {
+    Object Availability;
+    Availability["domain"] = Avail.Domain;
+
+    if (Avail.isUnavailable()) {
+      Availability["isUnconditionallyUnavailable"] = true;
+    } else {
+      serializeObject(Availability, "introduced",
+                      serializeSemanticVersion(Avail.Introduced));
+      serializeObject(Availability, "deprecated",
+                      serializeSemanticVersion(Avail.Deprecated));
+      serializeObject(Availability, "obsoleted",
+                      serializeSemanticVersion(Avail.Obsoleted));
+    }
+
+    AvailabilityArray.emplace_back(std::move(Availability));
   }
 
-  AvailabilityArray.emplace_back(std::move(Availability));
   return AvailabilityArray;
 }