[llvm] r185031 - Fix a crash bug in dumping options with groups

[Reid Kleckner]

Author: rnk
Date: Wed Jun 26 17:43:37 2013
New Revision: 185031

URL: http://llvm.org/viewvc/llvm-project?rev=185031&view=rev
Log:
Fix a crash bug in dumping options with groups

Option groups don't have prefixes.  Option dumping is basically dead
code unless there is something wrong with the option table, so this
isn't an important crasher.

Modified:
    llvm/trunk/lib/Option/Option.cpp

Modified: llvm/trunk/lib/Option/Option.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Option/Option.cpp?rev=185031&r1=185030&r2=185031&view=diff
==============================================================================
--- llvm/trunk/lib/Option/Option.cpp (original)
+++ llvm/trunk/lib/Option/Option.cpp Wed Jun 26 17:43:37 2013
@@ -50,11 +50,13 @@ void Option::dump() const {
 #undef P
   }
 
-  llvm::errs() << " Prefixes:[";
-  for (const char * const *Pre = Info->Prefixes; *Pre != 0; ++Pre) {
-    llvm::errs() << '"' << *Pre << (*(Pre + 1) == 0 ? "\"" : "\", ");
+  if (Info->Prefixes) {
+    llvm::errs() << " Prefixes:[";
+    for (const char * const *Pre = Info->Prefixes; *Pre != 0; ++Pre) {
+      llvm::errs() << '"' << *Pre << (*(Pre + 1) == 0 ? "\"" : "\", ");
+    }
+    llvm::errs() << ']';
   }
-  llvm::errs() << ']';
 
   llvm::errs() << " Name:\"" << getName() << '"';