[PATCH] D22411: bugpoint: add flag -verbose-errors

[Sebastian Pop via llvm-commits]

sebpop created this revision.
sebpop added reviewers: reames, majnemer, rnk.
sebpop added a subscriber: llvm-commits.

The default behavior of bugpoint is to print "<crash>" when it finds a reduced test that crashes compilation.
With this flag we now can see the output of the crashing program.
This is useful to make sure it is the same error being tracked down and not a different error that happens to crash the compiler as well.


https://reviews.llvm.org/D22411

Files:
  llvm/tools/bugpoint/CrashDebugger.cpp

Index: llvm/tools/bugpoint/CrashDebugger.cpp
===================================================================
--- llvm/tools/bugpoint/CrashDebugger.cpp
+++ llvm/tools/bugpoint/CrashDebugger.cpp
@@ -54,6 +54,9 @@
   cl::opt<bool> NoNamedMDRM("disable-namedmd-remove",
                             cl::desc("Do not remove global named metadata"),
                             cl::init(false));
+  cl::opt<bool> VerboseErrors("verbose-errors",
+                            cl::desc("Print the output of crashing program"),
+                            cl::init(false));
 }
 
 namespace llvm {
@@ -905,7 +908,10 @@
   std::string Error;
   BD.compileProgram(M, &Error);
   if (!Error.empty()) {
-    errs() << "<crash>\n";
+    if (VerboseErrors)
+      errs() << Error << "\n";
+    else
+      errs() << "<crash>\n";
     return true;  // Tool is still crashing.
   }
   errs() << '\n';


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