Check for (unlikely) errors from FindExecutable.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@117658 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 8 insertions, 1 deletions

diff --git a/tools/bugpoint/OptimizerDriver.cpp b/tools/bugpoint/OptimizerDriver.cpp
index 131bc99..178b1ff 100644
--- a/tools/bugpoint/OptimizerDriver.cpp
+++ b/tools/bugpoint/OptimizerDriver.cpp
@@ -143,11 +143,18 @@ bool BugDriver::runPasses(Module *Program,
     InFile.os().clear_error();
     return 1;
   }
+
+  sys::Path tool = FindExecutable("opt", getToolName(), (void*)"opt");
+  if (tool.empty()) {
+    errs() << "Cannot find `opt' in executable directory!\n";
+    return 1;
+  }
+
+  // Ok, everything that could go wrong before running opt is done.
   InFile.keep();
 
   // setup the child process' arguments
   SmallVector<const char*, 8> Args;
-  sys::Path tool = FindExecutable("opt", getToolName(), (void*)"opt");
   std::string Opt = tool.str();
   if (UseValgrind) {
     Args.push_back("valgrind");