diff --git a/llvm/test/tools/llvm-objdump/X86/macho-cstring-dump.test b/llvm/test/tools/llvm-objdump/X86/macho-cstring-dump.test
--- a/llvm/test/tools/llvm-objdump/X86/macho-cstring-dump.test
+++ b/llvm/test/tools/llvm-objdump/X86/macho-cstring-dump.test
@@ -1,9 +1,11 @@
-RUN: llvm-objdump -m -section __TEXT,__cstring %p/Inputs/hello.obj.macho-x86_64 | FileCheck %s
+RUN: llvm-objdump -m -section __TEXT,__cstring %p/Inputs/hello.obj.macho-x86_64 2>&1 | FileCheck %s
 RUN: llvm-objdump -m -section __TEXT,__cstring -no-leading-addr %p/Inputs/hello.obj.macho-x86_64 | FileCheck %s -check-prefix=NO_ADDR
 RUN: llvm-objdump -m -section __TEXT,__cstring -non-verbose %p/Inputs/hello.obj.macho-x86_64 | FileCheck %s -check-prefix=NON_VERBOSE
 
+CHECK-NOT: warning: section '__TEXT,__cstring' mentioned in a -j/--section option, but not found in any input file
 CHECK: Contents of (__TEXT,__cstring) section
-CHECK: 000000000000003b  Hello world\n
+CHECK-NEXT: 000000000000003b  Hello world\n
+CHECK-NOT: warning: section '__TEXT,__cstring' mentioned in a -j/--section option, but not found in any input file
 
 NO_ADDR: Contents of (__TEXT,__cstring) section
 NO_ADDR: Hello world\n
diff --git a/llvm/tools/llvm-objdump/MachODump.cpp b/llvm/tools/llvm-objdump/MachODump.cpp
--- a/llvm/tools/llvm-objdump/MachODump.cpp
+++ b/llvm/tools/llvm-objdump/MachODump.cpp
@@ -14,6 +14,7 @@
 #include "llvm-c/Disassembler.h"
 #include "llvm/ADT/STLExtras.h"
 #include "llvm/ADT/StringExtras.h"
+#include "llvm/ADT/StringSet.h"
 #include "llvm/ADT/Triple.h"
 #include "llvm/BinaryFormat/MachO.h"
 #include "llvm/Config/config.h"
@@ -191,6 +192,8 @@
     ArchFlags("arch", cl::desc("architecture(s) from a Mach-O file to dump"),
               cl::ZeroOrMore, cl::cat(MachOCat));
 
+extern StringSet<> FoundSectionSet;
+
 bool ArchAll = false;
 
 static std::string ThumbTripleName;
@@ -1747,13 +1750,16 @@
       DumpSectName = DumpSegSectName.first;
     }
     for (const SectionRef &Section : O->sections()) {
-      StringRef SectName;
+      StringRef SectName = StringRef();
       Expected<StringRef> SecNameOrErr = Section.getName();
       if (SecNameOrErr)
         SectName = *SecNameOrErr;
       else
         consumeError(SecNameOrErr.takeError());
 
+      if (!DumpSection.empty())
+        FoundSectionSet.insert(DumpSection);
+
       DataRefImpl Ref = Section.getRawDataRefImpl();
       StringRef SegName = O->getSectionFinalSegmentName(Ref);
       if ((DumpSegName.empty() || SegName == DumpSegName) &&
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
@@ -338,7 +338,7 @@
     HelpResponse("\nPass @FILE as argument to read options from FILE.\n");
 
 static StringSet<> DisasmFuncsSet;
-static StringSet<> FoundSectionSet;
+StringSet<> FoundSectionSet;
 static StringRef ToolName;
 
 typedef std::vector<std::tuple<uint64_t, StringRef, uint8_t>> SectionSymbolsTy;