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
@@ -488,6 +488,17 @@
     Members[Pos] = std::move(*NMOrErr);
 }
 
+static void deleteMember(std::vector<NewArchiveMember> &Members,
+                         StringRef FileName) {
+  StringRef MemberName = sys::path::filename(FileName);
+  for (auto Member = Members.begin(); Member != Members.end();) {
+    if (Member->MemberName == MemberName)
+      Member = Members.erase(Member);
+    else
+      ++Member;
+  }
+}
+
 enum InsertAction {
   IA_AddOldMember,
   IA_AddNewMember,
@@ -758,7 +769,7 @@
 }
 
 static void runMRIScript() {
-  enum class MRICommand { AddLib, AddMod, Create, Save, End, Invalid };
+  enum class MRICommand { AddLib, AddMod, Create, Delete, Save, End, Invalid };
 
   ErrorOr<std::unique_ptr<MemoryBuffer>> Buf = MemoryBuffer::getSTDIN();
   failIfError(Buf.getError());
@@ -779,6 +790,7 @@
                        .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);
@@ -813,6 +825,9 @@
         fail("File already saved");
       ArchiveName = Rest;
       break;
+    case MRICommand::Delete:
+      deleteMember(NewMembers, Rest);
+      break;
     case MRICommand::Save:
       Saved = true;
       break;