Index: test/tools/llvm-ar/mri-delete.test
===================================================================
--- test/tools/llvm-ar/mri-delete.test
+++ test/tools/llvm-ar/mri-delete.test
@@ -3,6 +3,10 @@
 
 RUN: echo "create %t.ar" > %t.mri
 RUN: echo "addmod %t.o" >> %t.mri
+RUN: echo "; comment" >> %t.mri
+RUN: echo " ;comment" >> %t.mri
+RUN: echo "* comment" >> %t.mri
+RUN: echo " *comment" >> %t.mri
 RUN: echo "addmod %S/Inputs/elf.yaml" >> %t.mri
 RUN: echo "delete %t.o" >> %t.mri
 RUN: echo "save" >> %t.mri
Index: tools/llvm-ar/llvm-ar.cpp
===================================================================
--- tools/llvm-ar/llvm-ar.cpp
+++ tools/llvm-ar/llvm-ar.cpp
@@ -807,10 +807,13 @@
   for (line_iterator I(Ref, /*SkipBlanks*/ true, ';'), E; I != E; ++I) {
     StringRef Line = *I;
     StringRef CommandStr, Rest;
+    Line = Line.trim();
     std::tie(CommandStr, Rest) = Line.split(' ');
     Rest = Rest.trim();
     if (!Rest.empty() && Rest.front() == '"' && Rest.back() == '"')
       Rest = Rest.drop_front().drop_back();
+    if (CommandStr.startswith(";") || CommandStr.startswith("*"))
+      continue;
     auto Command = StringSwitch<MRICommand>(CommandStr.lower())
                        .Case("addlib", MRICommand::AddLib)
                        .Case("addmod", MRICommand::AddMod)