Index: llvm/test/tools/llvm-ar/mri-delete.test
===================================================================
--- /dev/null
+++ llvm/test/tools/llvm-ar/mri-delete.test
@@ -0,0 +1,14 @@
+RUN: yaml2obj %S/Inputs/elf.yaml -o %t.o
+RUN: rm -f %t.ar
+
+RUN: echo "create %t.ar" > %t.mri
+RUN: echo "addmod %t.o" >> %t.mri
+RUN: echo "addmod %S/Inputs/elf.yaml" >> %t.mri
+RUN: echo "delete %t.o" >> %t.mri
+RUN: echo "save" >> %t.mri
+RUN: echo "end" >> %t.mri
+
+RUN: llvm-ar -M < %t.mri
+RUN: llvm-ar tv %t.ar | FileCheck %s
+
+CHECK-NOT: mri-delete.test{{.*}}.o
Index: llvm/tools/llvm-ar/llvm-ar.cpp
===================================================================
--- llvm/tools/llvm-ar/llvm-ar.cpp
+++ llvm/tools/llvm-ar/llvm-ar.cpp
@@ -770,7 +770,7 @@
 }
 
 static void runMRIScript(const MemoryBuffer &Ref) {
-  enum class MRICommand { AddLib, AddMod, Create, Save, End, Invalid };
+  enum class MRICommand { AddLib, AddMod, Create, Delete, Save, End, Invalid };
 
   bool Saved = false;
   std::vector<NewArchiveMember> NewMembers;
@@ -788,6 +788,7 @@
                        .Case("addlib", MRICommand::AddLib)
                        .Case("addmod", MRICommand::AddMod)
                        .Case("create", MRICommand::Create)
+                       .Case("delete", MRICommand::Delete)
                        .Case("save", MRICommand::Save)
                        .Case("end", MRICommand::End)
                        .Default(MRICommand::Invalid);
@@ -822,6 +823,9 @@
         fail("File already saved");
       ArchiveName = Rest;
       break;
+    case MRICommand::Delete:
+      Members.push_back(Rest);
+      break;
     case MRICommand::Save:
       Saved = true;
       break;
@@ -833,8 +837,11 @@
   }
 
   // Nothing to do if not saved.
-  if (Saved)
+  if (Saved) {
     performOperation(ReplaceOrInsert, &NewMembers);
+    if (!Members.empty())
+      performOperation(Delete, nullptr);
+  }
   exit(0);
 }