Index: lld/Common/ErrorHandler.cpp
===================================================================
--- lld/Common/ErrorHandler.cpp
+++ lld/Common/ErrorHandler.cpp
@@ -239,12 +239,15 @@
   case ErrorTag::LibNotFound:
     scriptArgs.push_back("missing-lib");
     break;
+  case ErrorTag::SymbolNotFound:
+    scriptArgs.push_back("missing-symbol");
+    break;
   default:
     llvm_unreachable("unsupported ErrorTag");
   }
   scriptArgs.insert(scriptArgs.end(), args.begin(), args.end());
-  int Res = llvm::sys::ExecuteAndWait(errorHandlingScript, scriptArgs);
-  switch (Res) {
+  int res = llvm::sys::ExecuteAndWait(errorHandlingScript, scriptArgs);
+  switch (res) {
   case 0:
     error(msg);
     return;
@@ -258,7 +261,7 @@
     return;
   default:
     error(msg + "\n'" + errorHandlingScript +
-          "': error handling script exited with code " + Twine(Res));
+          "': error handling script exited with code " + Twine(res));
   }
 }
 
Index: lld/ELF/Relocations.cpp
===================================================================
--- lld/ELF/Relocations.cpp
+++ lld/ELF/Relocations.cpp
@@ -919,7 +919,7 @@
   if (undef.isWarning)
     warn(msg);
   else
-    error(msg);
+    error(msg, ErrorTag::SymbolNotFound, {toString(sym)});
 }
 
 template <class ELFT> void elf::reportUndefinedSymbols() {
Index: lld/docs/error_handling_script.rst
===================================================================
--- lld/docs/error_handling_script.rst
+++ lld/docs/error_handling_script.rst
@@ -23,9 +23,13 @@
 
 The following tags are supported:
 
-:``missing-lib``:
-    indicates that LLD failed to find a library. The library name is specified as
-    the first argument, e.g. ``error-handling-script missing-lib mylib``
+- ``missing-lib``: indicates that LLD failed to find a library. The library name
+  is specified as the second argument, e.g. ``error-handling-script missing-lib
+  mylib``
+
+- ``missing-symbol``: indicates that LLD failed to find the given symbol. The
+  symbol name is specified as the second argument, e.g. ``error-handling-script
+  missing-symbol dlopen``
 
 Return Value
 ============
Index: lld/include/lld/Common/ErrorHandler.h
===================================================================
--- lld/include/lld/Common/ErrorHandler.h
+++ lld/include/lld/Common/ErrorHandler.h
@@ -89,7 +89,7 @@
 llvm::raw_ostream &outs();
 llvm::raw_ostream &errs();
 
-enum class ErrorTag { LibNotFound };
+enum class ErrorTag { LibNotFound, SymbolNotFound };
 
 class ErrorHandler {
 public:
Index: lld/test/ELF/error-handling-script-linux.test
===================================================================
--- lld/test/ELF/error-handling-script-linux.test
+++ lld/test/ELF/error-handling-script-linux.test
@@ -1,14 +1,20 @@
 #!/bin/sh
 # REQUIRES: x86
 # UNSUPPORTED: system-windows
-# RUN: llvm-mc -filetype=obj -triple=x86_64-unknown-linux /dev/null -o %t.o
-# RUN: not ld.lld -o /dev/null -lidontexist --error-handling-script=%s %t.o 2>&1 | FileCheck --check-prefix=CHECK-NORMAL %s
-# RUN: not ld.lld -o /dev/null -lidontexist --error-handling-script=%s.nope %t.o 2>&1 | FileCheck --check-prefix=CHECK-DOES-NOT-EXIST %s
 
-# CHECK-NORMAL: script: info: called with missing-lib idontexist
-# CHECK-NORMAL-NEXT: ld.lld: error: unable to find library -lidontexist
+# RUN: llvm-mc -filetype=obj -triple=x86_64-unknown-linux /dev/null -o %t0.o
+# RUN: not ld.lld -o /dev/null -lidontexist --error-handling-script=%s %t0.o 2>&1 | FileCheck --check-prefix=CHECK-LIB %s
+# RUN: not ld.lld -o /dev/null -lidontexist --error-handling-script=%s.nope %t0.o 2>&1 | FileCheck --check-prefix=CHECK-SCRIPT-DOES-NOT-EXIST %s
 
-# CHECK-DOES-NOT-EXIST: ld.lld: error: unable to find library -lidontexist
-# CHECK-DOES-NOT-EXIST-NEXT: '{{.*}}': error handling script failed to execute
+# RUN: echo 'bar: movl a(%rip), %eax' | llvm-mc -filetype=obj -triple=x86_64-unknown-linux - -o %t1.o
+# RUN: not ld.lld -o /dev/null --error-handling-script=%s %t1.o 2>&1 | FileCheck --check-prefix=CHECK-SYM %s
+
+# CHECK-LIB:      script: info: called with missing-lib idontexist
+# CHECK-LIB-NEXT: ld.lld: error: unable to find library -lidontexist
+
+# CHECK-SCRIPT-DOES-NOT-EXIST:      ld.lld: error: unable to find library -lidontexist
+# CHECK-SCRIPT-DOES-NOT-EXIST-NEXT: '{{.*}}': error handling script failed to execute
+
+# CHECK-SYM:      script: info: called with missing-symbol a
 
 echo "script: info: called with $*"