Index: llvm/tools/lto/lto.cpp
===================================================================
--- llvm/tools/lto/lto.cpp
+++ llvm/tools/lto/lto.cpp
@@ -474,11 +474,16 @@
 }
 
 void lto_codegen_debug_options(lto_code_gen_t cg, const char *opt) {
-  std::vector<const char *> Options;
+  // Make a copy of the options, so we can nul-terminate them each individual
+  // one.
+  std::vector<std::string> Storage;
   for (std::pair<StringRef, StringRef> o = getToken(opt); !o.first.empty();
        o = getToken(o.second))
-    Options.push_back(o.first.data());
+    Storage.push_back(o.first.str());
 
+  std::vector<const char *> Options;
+  transform(Storage, back_inserter(Options),
+            [](const std::string &S) { return S.c_str(); });
   unwrap(cg)->setCodeGenDebugOptions(Options);
 }