[lld] [CGData] LLD for MachO (PR #90166)

[Ellis Hoag via llvm-commits]

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@@ -1322,6 +1323,38 @@ static void gatherInputSections() {
   }
 }
 
+static void codegenDataGenerate() {
+  TimeTraceScope timeScope("Generating codegen data");
+
+  OutlinedHashTreeRecord globalOutlineRecord;
+  for (ConcatInputSection *isec : inputSections) {
+    if (isec->getSegName() == segment_names::data &&
+        isec->getName() == section_names::outlinedHashTree) {
+      // Read outlined hash tree from each section
+      OutlinedHashTreeRecord localOutlineRecord;
+      auto *data = isec->data.data();
+      localOutlineRecord.deserialize(data);
+
+      // Merge it to the global hash tree.
+      globalOutlineRecord.merge(localOutlineRecord);
+    }
+  }
+
+  CodeGenDataWriter Writer;
+  if (!globalOutlineRecord.empty())
+    Writer.addRecord(globalOutlineRecord);
+
+  std::error_code EC;
+  auto fileName = config->codegenDataGeneratePath;
+  assert(!fileName.empty());
+  raw_fd_ostream Output(fileName, EC, sys::fs::OF_None);
+  if (EC)
+    error("fail to create raw_fd_ostream");
+
+  if (auto E = Writer.write(Output))
+    error("fail to write CGData");
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ellishg wrote:

Can we pass `E` to the error message?

https://github.com/llvm/llvm-project/pull/90166