diff --git a/lld/MachO/Driver.cpp b/lld/MachO/Driver.cpp
--- a/lld/MachO/Driver.cpp
+++ b/lld/MachO/Driver.cpp
@@ -1452,8 +1452,11 @@
     replaceCommonSymbols();
 
     StringRef orderFile = args.getLastArgValue(OPT_order_file);
-    if (!orderFile.empty())
-      priorityBuilder.parseOrderFile(orderFile);
+    if (!orderFile.empty()) {
+      PriorityBuilder::SymbolOrder symbolOrder =
+          priorityBuilder.parseOrderFile(orderFile);
+      priorityBuilder.processOrderFile(symbolOrder);
+    }
 
     referenceStubBinder();
 
diff --git a/lld/MachO/SectionPriorities.h b/lld/MachO/SectionPriorities.h
--- a/lld/MachO/SectionPriorities.h
+++ b/lld/MachO/SectionPriorities.h
@@ -24,6 +24,7 @@
   // of the vertices are specified in the order file are discarded.
   void extractCallGraphProfile();
 
+  using SymbolOrder = std::vector<std::pair<StringRef, StringRef>>;
   // Reads the order file at `path` into config->priorities.
   //
   // An order file has one entry per line, in the following format:
@@ -40,7 +41,9 @@
   // lowest-ordered entry (the one nearest to the front of the list.)
   //
   // The file can also have line comments that start with '#'.
-  void parseOrderFile(StringRef path);
+  SymbolOrder parseOrderFile(StringRef path) const;
+
+  void processOrderFile(const SymbolOrder &symbolOrder);
 
   // Returns layout priorities for some or all input sections. Sections are laid
   // out in decreasing order; that is, a higher priority section will be closer
diff --git a/lld/MachO/SectionPriorities.cpp b/lld/MachO/SectionPriorities.cpp
--- a/lld/MachO/SectionPriorities.cpp
+++ b/lld/MachO/SectionPriorities.cpp
@@ -292,16 +292,18 @@
   }
 }
 
-void macho::PriorityBuilder::parseOrderFile(StringRef path) {
+std::vector<std::pair<StringRef, StringRef>>
+macho::PriorityBuilder::parseOrderFile(StringRef path) const {
   assert(callGraphProfile.empty() &&
          "Order file must be parsed before call graph profile is processed");
   Optional<MemoryBufferRef> buffer = readFile(path);
   if (!buffer) {
     error("Could not read order file at " + path);
-    return;
+    return {};
   }
 
   MemoryBufferRef mbref = *buffer;
+  SymbolOrder symbolOrder;
   for (StringRef line : args::getLines(mbref)) {
     StringRef objectFile, symbol;
     line = line.take_until([](char c) { return c == '#'; }); // ignore comments
@@ -336,14 +338,25 @@
     symbol = line.trim();
 
     if (!symbol.empty()) {
-      SymbolPriorityEntry &entry = priorities[symbol];
-      if (!objectFile.empty())
-        entry.objectFiles.insert(
-            std::make_pair(objectFile, highestAvailablePriority));
-      else
-        entry.anyObjectFile =
-            std::max(entry.anyObjectFile, highestAvailablePriority);
+      symbolOrder.emplace_back(
+          std::make_pair(StringRef(symbol), StringRef(objectFile)));
     }
+  }
+
+  return symbolOrder;
+}
+
+void macho::PriorityBuilder::processOrderFile(const SymbolOrder &symbolOrder) {
+  for (const auto &symbolObjectFile : symbolOrder) {
+    StringRef symbol = symbolObjectFile.first;
+    StringRef objectFile = symbolObjectFile.second;
+    SymbolPriorityEntry &entry = priorities[symbol];
+    if (!objectFile.empty())
+      entry.objectFiles.insert(
+          std::make_pair(objectFile, highestAvailablePriority));
+    else
+      entry.anyObjectFile =
+          std::max(entry.anyObjectFile, highestAvailablePriority);
 
     --highestAvailablePriority;
   }