diff --git a/llvm/test/tools/llvm-objdump/X86/warn-missing-disasm-func.test b/llvm/test/tools/llvm-objdump/X86/warn-missing-disasm-func.test
--- a/llvm/test/tools/llvm-objdump/X86/warn-missing-disasm-func.test
+++ b/llvm/test/tools/llvm-objdump/X86/warn-missing-disasm-func.test
@@ -1,5 +1,11 @@
 ## Warn if --disassemble-functions specifies an unknown symbol.
-# RUN: yaml2obj %s | llvm-objdump - --disassemble-functions=foo 2>&1 | FileCheck %s
+
+# RUN: yaml2obj -o %t.1.o %s
+# RUN: yaml2obj -o %t.2.o %s
+# RUN: rm -f %t.a
+# RUN: llvm-ar rc %t.a %t.1.o %t.2.o
+# RUN: llvm-objdump --disassemble-functions=foo %t.1.o 2>&1 | FileCheck %s
+# RUN: llvm-objdump --disassemble-functions=foo %t.a 2>&1 | FileCheck %s --check-prefix=MULTI
 
 --- !ELF
 FileHeader:
@@ -9,3 +15,8 @@
   Machine: EM_X86_64
 
 # CHECK: warning: failed to disassemble missing function foo
+
+# MULTI: file format ELF64-x86-64
+# MULTI: warning: failed to disassemble missing function foo
+# MULTI: file format ELF64-x86-64
+# MULTI: warning: failed to disassemble missing function foo
diff --git a/llvm/tools/llvm-objdump/llvm-objdump.cpp b/llvm/tools/llvm-objdump/llvm-objdump.cpp
--- a/llvm/tools/llvm-objdump/llvm-objdump.cpp
+++ b/llvm/tools/llvm-objdump/llvm-objdump.cpp
@@ -381,8 +381,12 @@
   errs().flush();
 }
 
-void warn(Twine Message) {
-  WithColor::warning(errs(), ToolName) << Message << "\n";
+static void warn(Twine Message, StringRef Prefix = "") {
+  // Output order between errs() and outs() matters especially for archive
+  // files where the output is per member object.
+  outs().flush();
+  WithColor::warning(errs(), Prefix) << Message << "\n";
+  errs().flush();
 }
 
 LLVM_ATTRIBUTE_NORETURN void report_error(StringRef File, Twine Message) {