diff --git a/lld/MachO/Driver.cpp b/lld/MachO/Driver.cpp
--- a/lld/MachO/Driver.cpp
+++ b/lld/MachO/Driver.cpp
@@ -1032,8 +1032,8 @@
   }
 
   // Initialize InputSections.
-  for (InputFile *file : inputFiles) {
-    for (SubsectionMap &map : file->subsections) {
+  for (const InputFile *file : inputFiles) {
+    for (const SubsectionMap &map : file->subsections) {
       for (const auto &p : map) {
         InputSection *isec = p.second;
         inputSections.push_back(isec);
diff --git a/lld/MachO/Dwarf.cpp b/lld/MachO/Dwarf.cpp
--- a/lld/MachO/Dwarf.cpp
+++ b/lld/MachO/Dwarf.cpp
@@ -25,7 +25,7 @@
   // The debugger will locate the debug info via the object file paths that we
   // emit in our STABS symbols, so we don't need to process & emit them
   // ourselves.
-  for (InputSection *isec : obj->debugSections) {
+  for (const InputSection *isec : obj->debugSections) {
     if (StringRef *s = StringSwitch<StringRef *>(isec->name)
                            .Case("__debug_info", &dObj->infoSection.Data)
                            .Case("__debug_abbrev", &dObj->abbrevSection)
diff --git a/lld/MachO/ExportTrie.cpp b/lld/MachO/ExportTrie.cpp
--- a/lld/MachO/ExportTrie.cpp
+++ b/lld/MachO/ExportTrie.cpp
@@ -108,7 +108,7 @@
   }
   // Compute size of all child edges.
   ++nodeSize; // Byte for number of children.
-  for (Edge &edge : edges) {
+  for (const Edge &edge : edges) {
     nodeSize += edge.substring.size() + 1             // String length.
                 + getULEB128Size(edge.child->offset); // Offset len.
   }
diff --git a/lld/MachO/SyntheticSections.cpp b/lld/MachO/SyntheticSections.cpp
--- a/lld/MachO/SyntheticSections.cpp
+++ b/lld/MachO/SyntheticSections.cpp
@@ -98,8 +98,8 @@
   if (in.exports->hasWeakSymbol || in.weakBinding->hasEntry())
     hdr->flags |= MachO::MH_BINDS_TO_WEAK;
 
-  for (OutputSegment *seg : outputSegments) {
-    for (OutputSection *osec : seg->getSections()) {
+  for (const OutputSegment *seg : outputSegments) {
+    for (const OutputSection *osec : seg->getSections()) {
       if (isThreadLocalVariables(osec->flags)) {
         hdr->flags |= MachO::MH_HAS_TLV_DESCRIPTORS;
         break;
@@ -108,7 +108,7 @@
   }
 
   uint8_t *p = reinterpret_cast<uint8_t *>(hdr + 1);
-  for (LoadCommand *lc : loadCommands) {
+  for (const LoadCommand *lc : loadCommands) {
     lc->writeTo(p);
     p += lc->getSize();
   }
@@ -767,7 +767,7 @@
 
   // Local symbols aren't in the SymbolTable, so we walk the list of object
   // files to gather them.
-  for (InputFile *file : inputFiles) {
+  for (const InputFile *file : inputFiles) {
     if (auto *objFile = dyn_cast<ObjFile>(file)) {
       for (Symbol *sym : objFile->symbols) {
         if (sym == nullptr)
diff --git a/lld/MachO/UnwindInfoSection.cpp b/lld/MachO/UnwindInfoSection.cpp
--- a/lld/MachO/UnwindInfoSection.cpp
+++ b/lld/MachO/UnwindInfoSection.cpp
@@ -174,12 +174,12 @@
 // is no source address to make a relative location meaningful.
 static void relocateCompactUnwind(MergedOutputSection *compactUnwindSection,
                                   std::vector<CompactUnwindEntry64> &cuVector) {
-  for (InputSection *isec : compactUnwindSection->inputs) {
+  for (const InputSection *isec : compactUnwindSection->inputs) {
     uint8_t *buf =
         reinterpret_cast<uint8_t *>(cuVector.data()) + isec->outSecFileOff;
     memcpy(buf, isec->data.data(), isec->data.size());
 
-    for (Reloc &r : isec->relocs) {
+    for (const Reloc &r : isec->relocs) {
       uint64_t referentVA = 0;
       if (auto *referentSym = r.referent.dyn_cast<macho::Symbol *>()) {
         if (!isa<Undefined>(referentSym)) {
diff --git a/lld/MachO/Writer.cpp b/lld/MachO/Writer.cpp
--- a/lld/MachO/Writer.cpp
+++ b/lld/MachO/Writer.cpp
@@ -189,7 +189,7 @@
         seg->lastSection()->addr + seg->lastSection()->getSize() - c->vmaddr;
     c->nsects = seg->numNonHiddenSections();
 
-    for (OutputSection *osec : seg->getSections()) {
+    for (const OutputSection *osec : seg->getSections()) {
       if (!isZeroFill(osec->flags)) {
         assert(osec->fileOff >= seg->fileOff);
         c->filesize = std::max(
@@ -616,7 +616,7 @@
   };
 
   // TODO: Make sure this handles weak symbols correctly.
-  for (InputFile *file : inputFiles)
+  for (const InputFile *file : inputFiles)
     if (isa<ObjFile>(file))
       for (lld::macho::Symbol *sym : file->symbols)
         if (auto *d = dyn_cast<Defined>(sym))
@@ -828,8 +828,8 @@
 
 void Writer::writeSections() {
   uint8_t *buf = buffer->getBufferStart();
-  for (OutputSegment *seg : outputSegments)
-    for (OutputSection *osec : seg->getSections())
+  for (const OutputSegment *seg : outputSegments)
+    for (const OutputSection *osec : seg->getSections())
       osec->writeTo(buf + osec->fileOff);
 }