diff --git a/llvm/lib/Linker/LinkModules.cpp b/llvm/lib/Linker/LinkModules.cpp
index 485ac106d4ebb..ef582331b30a0 100644
--- a/llvm/lib/Linker/LinkModules.cpp
+++ b/llvm/lib/Linker/LinkModules.cpp
@@ -321,8 +321,21 @@ bool ModuleLinker::shouldLinkFromSource(bool &LinkFromSrc,
   assert(!Dest.hasExternalWeakLinkage());
   assert(Dest.hasExternalLinkage() && Src.hasExternalLinkage() &&
          "Unexpected linkage type!");
-  return emitError("Linking globals named '" + Src.getName() +
-                   "': symbol multiply defined!");
+
+  std::string message = ("Linking globals named '" + Src.getName() +
+                      "': symbol multiply defined!").str();
+  if (auto SrcParent = Src.getParent(); SrcParent != nullptr) {
+    message += " (source: ";
+    message += SrcParent->getName();
+    message += ")";
+  }
+
+  if (auto DestParent = Dest.getParent(); DestParent != nullptr) {
+    message += " (dest: ";
+    message += DestParent->getName();
+    message += ")";
+  }
+  return emitError(message);
 }
 
 bool ModuleLinker::linkIfNeeded(GlobalValue &GV,
diff --git a/llvm/test/LTO/X86/Inputs/duplicate1.ll b/llvm/test/LTO/X86/Inputs/duplicate1.ll
new file mode 100644
index 0000000000000..a5db7c17e90d1
--- /dev/null
+++ b/llvm/test/LTO/X86/Inputs/duplicate1.ll
@@ -0,0 +1,6 @@
+target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
+
+define void @this_function_is_duplicated() {
+entry:
+  ret void
+}
diff --git a/llvm/test/LTO/X86/Inputs/duplicate2.ll b/llvm/test/LTO/X86/Inputs/duplicate2.ll
new file mode 100644
index 0000000000000..a5db7c17e90d1
--- /dev/null
+++ b/llvm/test/LTO/X86/Inputs/duplicate2.ll
@@ -0,0 +1,6 @@
+target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
+
+define void @this_function_is_duplicated() {
+entry:
+  ret void
+}
diff --git a/llvm/test/LTO/X86/duplicate_symbol.test b/llvm/test/LTO/X86/duplicate_symbol.test
new file mode 100644
index 0000000000000..df1fb438b4c1b
--- /dev/null
+++ b/llvm/test/LTO/X86/duplicate_symbol.test
@@ -0,0 +1,5 @@
+RUN: llvm-as %S/Inputs/duplicate1.ll -o %t.duplicate1.bc
+RUN: llvm-as %S/Inputs/duplicate2.ll -o %t.duplicate2.bc
+RUN: not llvm-lto %t.duplicate1.bc %t.duplicate2.bc -o %t.lto.obj 2>&1 | FileCheck %s
+CHECK: symbol multiply defined!
+CHECK: duplicate2
diff --git a/llvm/test/tools/llvm-link/Inputs/duplicate1.ll b/llvm/test/tools/llvm-link/Inputs/duplicate1.ll
new file mode 100644
index 0000000000000..a5db7c17e90d1
--- /dev/null
+++ b/llvm/test/tools/llvm-link/Inputs/duplicate1.ll
@@ -0,0 +1,6 @@
+target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
+
+define void @this_function_is_duplicated() {
+entry:
+  ret void
+}
diff --git a/llvm/test/tools/llvm-link/Inputs/duplicate2.ll b/llvm/test/tools/llvm-link/Inputs/duplicate2.ll
new file mode 100644
index 0000000000000..a5db7c17e90d1
--- /dev/null
+++ b/llvm/test/tools/llvm-link/Inputs/duplicate2.ll
@@ -0,0 +1,6 @@
+target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
+
+define void @this_function_is_duplicated() {
+entry:
+  ret void
+}
diff --git a/llvm/test/tools/llvm-link/duplicate_symbol.test b/llvm/test/tools/llvm-link/duplicate_symbol.test
new file mode 100644
index 0000000000000..4633e11e3a12a
--- /dev/null
+++ b/llvm/test/tools/llvm-link/duplicate_symbol.test
@@ -0,0 +1,5 @@
+RUN: llvm-as %S/Inputs/duplicate1.ll -o %t.duplicate1.bc
+RUN: llvm-as %S/Inputs/duplicate2.ll -o %t.duplicate2.bc
+RUN: not llvm-link %t.duplicate1.bc %t.duplicate2.bc -o %t.duplicate.linked.bc 2>&1 | FileCheck %s
+CHECK: symbol multiply defined!
+CHECK: duplicate2