If the Program name was NULL then all further output sent to std::cerr was
suppressed.

llvm-svn: 29477
diff --git a/llvm/lib/Support/CommandLine.cpp b/llvm/lib/Support/CommandLine.cpp
index 08b6fcb..f7fbef6 100644
--- a/llvm/lib/Support/CommandLine.cpp
+++ b/llvm/lib/Support/CommandLine.cpp
@@ -616,7 +616,9 @@
   if (ArgName[0] == 0)
     std::cerr << HelpStr;  // Be nice for positional arguments
   else
-    std::cerr << ProgramName << ": for the -" << ArgName;
+    std::cerr << (ProgramName ? ProgramName : "***")
+              << ": for the -" << ArgName;
+  
   std::cerr << " option: " << Message << "\n";
   return true;
 }