# HG changeset patch
# User Christian Holler <choller@mozilla.com>
# Date 1586344236 -7200
#      Wed Apr 08 13:10:36 2020 +0200
# Node ID ab10fba76a52a5b205038150ad198dfc4583c566
# Parent  5f0446b8b0b20f432fa5dc016b781270c469fe83
[libFuzzer] Allow external functions to be defined at runtime

diff --git a/tools/fuzzing/libfuzzer/FuzzerDriver.cpp b/tools/fuzzing/libfuzzer/FuzzerDriver.cpp
--- a/tools/fuzzing/libfuzzer/FuzzerDriver.cpp
+++ b/tools/fuzzing/libfuzzer/FuzzerDriver.cpp
@@ -560,17 +560,18 @@ int AnalyzeDictionary(Fuzzer *F, const V
   Printf("###### End of useless dictionary elements. ######\n");
   return 0;
 }
 
 int FuzzerDriver(int *argc, char ***argv, UserCallback Callback) {
   using namespace fuzzer;
   assert(argc && argv && "Argument pointers cannot be nullptr");
   std::string Argv0((*argv)[0]);
-  EF = new ExternalFunctions();
+  if (!EF)
+    EF = new ExternalFunctions();
   if (EF->LLVMFuzzerInitialize)
     EF->LLVMFuzzerInitialize(argc, argv);
   if (EF->__msan_scoped_disable_interceptor_checks)
     EF->__msan_scoped_disable_interceptor_checks();
   const Vector<std::string> Args(*argv, *argv + *argc);
   assert(!Args.empty());
   ProgName = new std::string(Args[0]);
   if (Argv0 != *ProgName) {