Use errs() instead of std::cerr.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@75791 91177308-0d34-0410-b5e6-96231b3b80d8

20 files changed, 246 insertions, 239 deletions

diff --git a/tools/bugpoint/BugDriver.cpp b/tools/bugpoint/BugDriver.cpp
index 269bf5fb09..ac5de15589 100644
--- a/tools/bugpoint/BugDriver.cpp
+++ b/tools/bugpoint/BugDriver.cpp
@@ -117,13 +117,13 @@ bool BugDriver::addSources(const std::vector<std::string> &Filenames) {
         std::cout << "Linking in input file: '" << Filenames[i] << "'\n";
       std::string ErrorMessage;
       if (Linker::LinkModules(Program, M.get(), &ErrorMessage)) {
-        std::cerr << ToolName << ": error linking in '" << Filenames[i] << "': "
-                  << ErrorMessage << '\n';
+        errs() << ToolName << ": error linking in '" << Filenames[i] << "': "
+               << ErrorMessage << '\n';
         return true;
       }
     }
   } catch (const std::string &Error) {
-    std::cerr << ToolName << ": error reading input '" << Error << "'\n";
+    errs() << ToolName << ": error reading input '" << Error << "'\n";
     return true;
   }
 
@@ -209,7 +209,7 @@ bool BugDriver::run() {
       return debugMiscompilation();
     }
   } catch (ToolExecutionError &TEE) {
-    std::cerr << TEE.what();
+    errs() << TEE.what();
     return debugCodeGeneratorCrash();
   }
 
@@ -218,7 +218,7 @@ bool BugDriver::run() {
   try {
     return debugCodeGenerator();
   } catch (ToolExecutionError &TEE) {
-    std::cerr << TEE.what();
+    errs() << TEE.what();
     return debugCodeGeneratorCrash();
   }
 }
diff --git a/tools/bugpoint/CrashDebugger.cpp b/tools/bugpoint/CrashDebugger.cpp
index 3084857f1a..34efdc119d 100644
--- a/tools/bugpoint/CrashDebugger.cpp
+++ b/tools/bugpoint/CrashDebugger.cpp
@@ -28,6 +28,7 @@
 #include "llvm/Transforms/Utils/Cloning.h"
 #include "llvm/Support/FileUtilities.h"
 #include "llvm/Support/CommandLine.h"
+#include <iostream>
 #include <fstream>
 #include <set>
 using namespace llvm;
@@ -75,8 +76,8 @@ ReducePassList::doTest(std::vector<const PassInfo*> &Prefix,
 
     BD.Program = ParseInputFile(PrefixOutput.toString(), BD.getContext());
     if (BD.Program == 0) {
-      std::cerr << BD.getToolName() << ": Error reading bitcode file '"
-                << PrefixOutput << "'!\n";
+      errs() << BD.getToolName() << ": Error reading bitcode file '"
+             << PrefixOutput << "'!\n";
       exit(1);
     }
     PrefixOutput.eraseFromDisk();
@@ -631,10 +632,10 @@ bool BugDriver::debugOptimizerCrash(const std::string &ID) {
 static bool TestForCodeGenCrash(BugDriver &BD, Module *M) {
   try {
     BD.compileProgram(M);
-    std::cerr << '\n';
+    errs() << '\n';
     return false;
   } catch (ToolExecutionError &) {
-    std::cerr << "<crash>\n";
+    errs() << "<crash>\n";
     return true;  // Tool is still crashing.
   }
 }
@@ -643,7 +644,7 @@ static bool TestForCodeGenCrash(BugDriver &BD, Module *M) {
 /// crashes on an input.  It attempts to reduce the input as much as possible
 /// while still causing the code generator to crash.
 bool BugDriver::debugCodeGeneratorCrash() {
-  std::cerr << "*** Debugging code generator crash!\n";
+  errs() << "*** Debugging code generator crash!\n";
 
   return DebugACrash(*this, TestForCodeGenCrash);
 }
diff --git a/tools/bugpoint/ExecutionDriver.cpp b/tools/bugpoint/ExecutionDriver.cpp
index 854aeb817f..6e5b7a0514 100644
--- a/tools/bugpoint/ExecutionDriver.cpp
+++ b/tools/bugpoint/ExecutionDriver.cpp
@@ -186,7 +186,7 @@ bool BugDriver::initializeExecutionEnvironment() {
     break;
   }
   if (!Interpreter)
-    std::cerr << Message;
+    errs() << Message;
   else // Display informational messages on stdout instead of stderr
     std::cout << Message;
 
@@ -278,13 +278,13 @@ void BugDriver::compileProgram(Module *M) {
   sys::Path BitcodeFile ("bugpoint-test-program.bc");
   std::string ErrMsg;
   if (BitcodeFile.makeUnique(true,&ErrMsg)) {
-    std::cerr << ToolName << ": Error making unique filename: " << ErrMsg 
-              << "\n";
+    errs() << ToolName << ": Error making unique filename: " << ErrMsg 
+           << "\n";
     exit(1);
   }
   if (writeProgramToFile(BitcodeFile.toString(), M)) {
-    std::cerr << ToolName << ": Error emitting bitcode to file '"
-              << BitcodeFile << "'!\n";
+    errs() << ToolName << ": Error emitting bitcode to file '"
+           << BitcodeFile << "'!\n";
     exit(1);
   }
 
@@ -313,15 +313,15 @@ std::string BugDriver::executeProgram(std::string OutputFile,
     // Emit the program to a bitcode file...
     sys::Path uniqueFilename("bugpoint-test-program.bc");
     if (uniqueFilename.makeUnique(true, &ErrMsg)) {
-      std::cerr << ToolName << ": Error making unique filename: " 
-                << ErrMsg << "!\n";
+      errs() << ToolName << ": Error making unique filename: "
+             << ErrMsg << "!\n";
       exit(1);
     }
     BitcodeFile = uniqueFilename.toString();
 
     if (writeProgramToFile(BitcodeFile, Program)) {
-      std::cerr << ToolName << ": Error emitting bitcode to file '"
-                << BitcodeFile << "'!\n";
+      errs() << ToolName << ": Error emitting bitcode to file '"
+             << BitcodeFile << "'!\n";
       exit(1);
     }
     CreatedBitcode = true;
@@ -336,8 +336,8 @@ std::string BugDriver::executeProgram(std::string OutputFile,
   // Check to see if this is a valid output filename...
   sys::Path uniqueFile(OutputFile);
   if (uniqueFile.makeUnique(true, &ErrMsg)) {
-    std::cerr << ToolName << ": Error making unique filename: "
-              << ErrMsg << "\n";
+    errs() << ToolName << ": Error making unique filename: "
+           << ErrMsg << "\n";
     exit(1);
   }
   OutputFile = uniqueFile.toString();
@@ -352,7 +352,7 @@ std::string BugDriver::executeProgram(std::string OutputFile,
                                   Timeout, MemoryLimit);
 
   if (RetVal == -1) {
-    std::cerr << "<timeout>";
+    errs() << "<timeout>";
     static bool FirstTimeout = true;
     if (FirstTimeout) {
       std::cout << "\n"
@@ -420,12 +420,12 @@ bool BugDriver::createReferenceFile(Module *M, const std::string &Filename) {
     ReferenceOutputFile = executeProgramSafely(Filename);
     std::cout << "\nReference output is: " << ReferenceOutputFile << "\n\n";
   } catch (ToolExecutionError &TEE) {
-    std::cerr << TEE.what();
+    errs() << TEE.what();
     if (Interpreter != SafeInterpreter) {
-      std::cerr << "*** There is a bug running the \"safe\" backend.  Either"
-                << " debug it (for example with the -run-cbe bugpoint option,"
-                << " if CBE is being used as the \"safe\" backend), or fix the"
-                << " error some other way.\n";
+      errs() << "*** There is a bug running the \"safe\" backend.  Either"
+             << " debug it (for example with the -run-cbe bugpoint option,"
+             << " if CBE is being used as the \"safe\" backend), or fix the"
+             << " error some other way.\n";
     }
     return false;
   }
@@ -452,7 +452,7 @@ bool BugDriver::diffProgram(const std::string &BitcodeFile,
                                         sys::Path(Output.toString()),
                                         AbsTolerance, RelTolerance, &Error)) {
     if (Diff == 2) {
-      std::cerr << "While diffing output: " << Error << '\n';
+      errs() << "While diffing output: " << Error << '\n';
       exit(1);
     }
     FilesDifferent = true;
diff --git a/tools/bugpoint/ExtractFunction.cpp b/tools/bugpoint/ExtractFunction.cpp
index 3df130771f..7bdba50791 100644
--- a/tools/bugpoint/ExtractFunction.cpp
+++ b/tools/bugpoint/ExtractFunction.cpp
@@ -127,7 +127,7 @@ Module *BugDriver::performFinalCleanups(Module *M, bool MayModifySemantics) {
 
   Module *New = runPassesOn(M, CleanupPasses);
   if (New == 0) {
-    std::cerr << "Final cleanups failed.  Sorry. :(  Please report a bug!\n";
+    errs() << "Final cleanups failed.  Sorry. :(  Please report a bug!\n";
     return M;
   }
   delete M;
@@ -288,9 +288,9 @@ llvm::SplitFunctionsOutOfModule(Module *M,
   std::set<Function *> TestFunctions;
   for (unsigned i = 0, e = F.size(); i != e; ++i) {
     Function *TNOF = cast<Function>(ValueMap[F[i]]);
-    DEBUG(std::cerr << "Removing function ");
-    DEBUG(WriteAsOperand(std::cerr, TNOF, false));
-    DEBUG(std::cerr << "\n");
+    DEBUG(errs() << "Removing function ");
+    DEBUG(WriteAsOperand(errs(), TNOF, false));
+    DEBUG(errs() << "\n");
     TestFunctions.insert(cast<Function>(NewValueMap[TNOF]));
     DeleteFunctionBody(TNOF);       // Function is now external in this module!
   }
@@ -328,7 +328,7 @@ Module *BugDriver::ExtractMappedBlocksFromModule(const
   std::string ErrMsg;
   if (uniqueFilename.createTemporaryFileOnDisk(true, &ErrMsg)) {
     std::cout << "*** Basic Block extraction failed!\n";
-    std::cerr << "Error creating temporary file: " << ErrMsg << "\n";
+    errs() << "Error creating temporary file: " << ErrMsg << "\n";
     M = swapProgramIn(M);
     EmitProgressBitcode("basicblockextractfail", true);
     swapProgramIn(M);
@@ -339,8 +339,8 @@ Module *BugDriver::ExtractMappedBlocksFromModule(const
   std::ofstream BlocksToNotExtractFile(uniqueFilename.c_str());
   if (!BlocksToNotExtractFile) {
     std::cout << "*** Basic Block extraction failed!\n";
-    std::cerr << "Error writing list of blocks to not extract: " << ErrMsg
-              << "\n";
+    errs() << "Error writing list of blocks to not extract: " << ErrMsg
+           << "\n";
     M = swapProgramIn(M);
     EmitProgressBitcode("basicblockextractfail", true);
     swapProgramIn(M);
diff --git a/tools/bugpoint/FindBugs.cpp b/tools/bugpoint/FindBugs.cpp
index e42cce47ba..a28c1b667d 100644
--- a/tools/bugpoint/FindBugs.cpp
+++ b/tools/bugpoint/FindBugs.cpp
@@ -97,7 +97,7 @@ bool BugDriver::runManyPasses(const std::vector<const PassInfo*> &AllPasses) {
         std::cout << "\n*** diff'd output matches!\n";
       }
     } catch (ToolExecutionError &TEE) {
-      std::cerr << TEE.what();
+      errs() << TEE.what();
       debugCodeGeneratorCrash();
       return true;
     }
diff --git a/tools/bugpoint/ListReducer.h b/tools/bugpoint/ListReducer.h
index de3f389200..8036d1f544 100644
--- a/tools/bugpoint/ListReducer.h
+++ b/tools/bugpoint/ListReducer.h
@@ -15,8 +15,8 @@
 #ifndef BUGPOINT_LIST_REDUCER_H
 #define BUGPOINT_LIST_REDUCER_H
 
+#include "llvm/Support/raw_ostream.h"
 #include <vector>
-#include <iostream>
 #include <cstdlib>
 #include <algorithm>
 
@@ -58,7 +58,7 @@ struct ListReducer {
 
     case KeepSuffix:
       // cannot be reached!
-      std::cerr << "bugpoint ListReducer internal error: selected empty set.\n";
+      errs() << "bugpoint ListReducer internal error: selected empty set.\n";
       abort();
 
     case NoFailure:
@@ -77,7 +77,7 @@ Backjump:
     while (MidTop > 1) { // Binary split reduction loop
       // Halt if the user presses ctrl-c.
       if (BugpointIsInterrupted) {
-        std::cerr << "\n\n*** Reduction Interrupted, cleaning up...\n\n";
+        errs() << "\n\n*** Reduction Interrupted, cleaning up...\n\n";
         return true;
       }
 
@@ -88,7 +88,7 @@ Backjump:
           NumOfIterationsWithoutProgress > MaxIterations) {
         std::vector<ElTy> ShuffledList(TheList);
         std::random_shuffle(ShuffledList.begin(), ShuffledList.end());
-        std::cerr << "\n\n*** Testing shuffled set...\n\n";
+        errs() << "\n\n*** Testing shuffled set...\n\n";
         // Check that random shuffle doesn't loose the bug
         if (doTest(ShuffledList, empty) == KeepPrefix) {
           // If the bug is still here, use the shuffled list.
@@ -97,10 +97,10 @@ Backjump:
           // Must increase the shuffling treshold to avoid the small 
           // probability of inifinite looping without making progress.
           MaxIterations += 2;
-          std::cerr << "\n\n*** Shuffling does not hide the bug...\n\n";
+          errs() << "\n\n*** Shuffling does not hide the bug...\n\n";
         } else {
           ShufflingEnabled = false; // Disable shuffling further on
-          std::cerr << "\n\n*** Shuffling hides the bug...\n\n";
+          errs() << "\n\n*** Shuffling hides the bug...\n\n";
         }
         NumOfIterationsWithoutProgress = 0;
       }
@@ -160,7 +160,7 @@ Backjump:
         
         for (unsigned i = 1; i < TheList.size()-1; ++i) { // Check interior elts
           if (BugpointIsInterrupted) {
-            std::cerr << "\n\n*** Reduction Interrupted, cleaning up...\n\n";
+            errs() << "\n\n*** Reduction Interrupted, cleaning up...\n\n";
             return true;
           }
           
diff --git a/tools/bugpoint/Miscompilation.cpp b/tools/bugpoint/Miscompilation.cpp
index c655e71427..efa253823b 100644
--- a/tools/bugpoint/Miscompilation.cpp
+++ b/tools/bugpoint/Miscompilation.cpp
@@ -26,6 +26,7 @@
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Support/FileUtilities.h"
 #include "llvm/Config/config.h"   // for HAVE_LINK_R
+#include <iostream>
 using namespace llvm;
 
 namespace llvm {
@@ -61,8 +62,8 @@ ReduceMiscompilingPasses::doTest(std::vector<const PassInfo*> &Prefix,
 
   std::string BitcodeResult;
   if (BD.runPasses(Suffix, BitcodeResult, false/*delete*/, true/*quiet*/)) {
-    std::cerr << " Error running this sequence of passes"
-              << " on the input program!\n";
+    errs() << " Error running this sequence of passes"
+           << " on the input program!\n";
     BD.setPassesToRun(Suffix);
     BD.EmitProgressBitcode("pass-error",  false);
     exit(BD.debugOptimizerCrash());
@@ -72,8 +73,8 @@ ReduceMiscompilingPasses::doTest(std::vector<const PassInfo*> &Prefix,
   if (BD.diffProgram(BitcodeResult, "", true /*delete bitcode*/)) {
     std::cout << " nope.\n";
     if (Suffix.empty()) {
-      std::cerr << BD.getToolName() << ": I'm confused: the test fails when "
-                << "no passes are run, nondeterministic program?\n";
+      errs() << BD.getToolName() << ": I'm confused: the test fails when "
+             << "no passes are run, nondeterministic program?\n";
       exit(1);
     }
     return KeepSuffix;         // Miscompilation detected!
@@ -94,8 +95,8 @@ ReduceMiscompilingPasses::doTest(std::vector<const PassInfo*> &Prefix,
   // prefix passes, then discard the prefix passes.
   //
   if (BD.runPasses(Prefix, BitcodeResult, false/*delete*/, true/*quiet*/)) {
-    std::cerr << " Error running this sequence of passes"
-              << " on the input program!\n";
+    errs() << " Error running this sequence of passes"
+           << " on the input program!\n";
     BD.setPassesToRun(Prefix);
     BD.EmitProgressBitcode("pass-error",  false);
     exit(BD.debugOptimizerCrash());
@@ -114,8 +115,8 @@ ReduceMiscompilingPasses::doTest(std::vector<const PassInfo*> &Prefix,
   //
   Module *PrefixOutput = ParseInputFile(BitcodeResult, BD.getContext());
   if (PrefixOutput == 0) {
-    std::cerr << BD.getToolName() << ": Error reading bitcode file '"
-              << BitcodeResult << "'!\n";
+    errs() << BD.getToolName() << ": Error reading bitcode file '"
+           << BitcodeResult << "'!\n";
     exit(1);
   }
   sys::Path(BitcodeResult).eraseFromDisk();  // No longer need the file on disk
@@ -130,8 +131,8 @@ ReduceMiscompilingPasses::doTest(std::vector<const PassInfo*> &Prefix,
 
   Module *OriginalInput = BD.swapProgramIn(PrefixOutput);
   if (BD.runPasses(Suffix, BitcodeResult, false/*delete*/, true/*quiet*/)) {
-    std::cerr << " Error running this sequence of passes"
-              << " on the input program!\n";
+    errs() << " Error running this sequence of passes"
+           << " on the input program!\n";
     BD.setPassesToRun(Suffix);
     BD.EmitProgressBitcode("pass-error",  false);
     exit(BD.debugOptimizerCrash());
@@ -187,8 +188,8 @@ static bool TestMergedProgram(BugDriver &BD, Module *M1, Module *M2,
     M2 = CloneModule(M2);
   }
   if (Linker::LinkModules(M1, M2, &ErrorMsg)) {
-    std::cerr << BD.getToolName() << ": Error linking modules together:"
-              << ErrorMsg << '\n';
+    errs() << BD.getToolName() << ": Error linking modules together:"
+           << ErrorMsg << '\n';
     exit(1);
   }
   delete M2;   // We are done with this module.
@@ -279,7 +280,7 @@ static bool ExtractLoops(BugDriver &BD,
       return MadeChange;
     }
 
-    std::cerr << "Extracted a loop from the breaking portion of the program.\n";
+    errs() << "Extracted a loop from the breaking portion of the program.\n";
 
     // Bugpoint is intentionally not very trusting of LLVM transformations.  In
     // particular, we're not going to assume that the loop extractor works, so
@@ -291,16 +292,16 @@ static bool ExtractLoops(BugDriver &BD,
       BD.switchToInterpreter(AI);
 
       // Merged program doesn't work anymore!
-      std::cerr << "  *** ERROR: Loop extraction broke the program. :("
-                << " Please report a bug!\n";
-      std::cerr << "      Continuing on with un-loop-extracted version.\n";
+      errs() << "  *** ERROR: Loop extraction broke the program. :("
+             << " Please report a bug!\n";
+      errs() << "      Continuing on with un-loop-extracted version.\n";
 
       BD.writeProgramToFile("bugpoint-loop-extract-fail-tno.bc", ToNotOptimize);
       BD.writeProgramToFile("bugpoint-loop-extract-fail-to.bc", ToOptimize);
       BD.writeProgramToFile("bugpoint-loop-extract-fail-to-le.bc",
                             ToOptimizeLoopExtracted);
 
-      std::cerr << "Please submit the bugpoint-loop-extract-fail-*.bc files.\n";
+      errs() << "Please submit the bugpoint-loop-extract-fail-*.bc files.\n";
       delete ToOptimize;
       delete ToNotOptimize;
       delete ToOptimizeLoopExtracted;
@@ -339,8 +340,8 @@ static bool ExtractLoops(BugDriver &BD,
     // extract another loop.
     std::string ErrorMsg;
     if (Linker::LinkModules(ToNotOptimize, ToOptimizeLoopExtracted, &ErrorMsg)){
-      std::cerr << BD.getToolName() << ": Error linking modules together:"
-                << ErrorMsg << '\n';
+      errs() << BD.getToolName() << ": Error linking modules together:"
+             << ErrorMsg << '\n';
       exit(1);
     }
     delete ToOptimizeLoopExtracted;
@@ -462,7 +463,7 @@ static bool ExtractBlocks(BugDriver &BD,
   Module *Extracted = BD.ExtractMappedBlocksFromModule(Blocks, ToExtract);
   if (Extracted == 0) {
     // Weird, extraction should have worked.
-    std::cerr << "Nondeterministic problem extracting blocks??\n";
+    errs() << "Nondeterministic problem extracting blocks??\n";
     delete ProgClone;
     delete ToExtract;
     return false;
@@ -481,8 +482,8 @@ static bool ExtractBlocks(BugDriver &BD,
 
   std::string ErrorMsg;
   if (Linker::LinkModules(ProgClone, Extracted, &ErrorMsg)) {
-    std::cerr << BD.getToolName() << ": Error linking modules together:"
-              << ErrorMsg << '\n';
+    errs() << BD.getToolName() << ": Error linking modules together:"
+           << ErrorMsg << '\n';
     exit(1);
   }
   delete Extracted;
@@ -606,8 +607,8 @@ bool BugDriver::debugMiscompilation() {
   // Make sure something was miscompiled...
   if (!BugpointIsInterrupted)
     if (!ReduceMiscompilingPasses(*this).reduceList(PassesToRun)) {
-      std::cerr << "*** Optimized program matches reference output!  No problem"
-                << " detected...\nbugpoint can't help you with your problem!\n";
+      errs() << "*** Optimized program matches reference output!  No problem"
+             << " detected...\nbugpoint can't help you with your problem!\n";
       return false;
     }
 
@@ -796,7 +797,7 @@ static void CleanupAndPrepareModules(BugDriver &BD, Module *&Test,
   }
 
   if (verifyModule(*Test) || verifyModule(*Safe)) {
-    std::cerr << "Bugpoint has a bug, which corrupted a module!!\n";
+    errs() << "Bugpoint has a bug, which corrupted a module!!\n";
     abort();
   }
 }
@@ -813,12 +814,12 @@ static bool TestCodeGenerator(BugDriver &BD, Module *Test, Module *Safe) {
   sys::Path TestModuleBC("bugpoint.test.bc");
   std::string ErrMsg;
   if (TestModuleBC.makeUnique(true, &ErrMsg)) {
-    std::cerr << BD.getToolName() << "Error making unique filename: "
-              << ErrMsg << "\n";
+    errs() << BD.getToolName() << "Error making unique filename: "
+           << ErrMsg << "\n";
     exit(1);
   }
   if (BD.writeProgramToFile(TestModuleBC.toString(), Test)) {
-    std::cerr << "Error writing bitcode to `" << TestModuleBC << "'\nExiting.";
+    errs() << "Error writing bitcode to `" << TestModuleBC << "'\nExiting.";
     exit(1);
   }
   delete Test;
@@ -826,13 +827,13 @@ static bool TestCodeGenerator(BugDriver &BD, Module *Test, Module *Safe) {
   // Make the shared library
   sys::Path SafeModuleBC("bugpoint.safe.bc");
   if (SafeModuleBC.makeUnique(true, &ErrMsg)) {
-    std::cerr << BD.getToolName() << "Error making unique filename: "
-              << ErrMsg << "\n";
+    errs() << BD.getToolName() << "Error making unique filename: "
+           << ErrMsg << "\n";
     exit(1);
   }
 
   if (BD.writeProgramToFile(SafeModuleBC.toString(), Safe)) {
-    std::cerr << "Error writing bitcode to `" << SafeModuleBC << "'\nExiting.";
+    errs() << "Error writing bitcode to `" << SafeModuleBC << "'\nExiting.";
     exit(1);
   }
   std::string SharedObject = BD.compileSharedObject(SafeModuleBC.toString());
@@ -843,9 +844,9 @@ static bool TestCodeGenerator(BugDriver &BD, Module *Test, Module *Safe) {
   int Result = BD.diffProgram(TestModuleBC.toString(), SharedObject, false);
 
   if (Result)
-    std::cerr << ": still failing!\n";
+    errs() << ": still failing!\n";
   else
-    std::cerr << ": didn't fail.\n";
+    errs() << ": didn't fail.\n";
   TestModuleBC.eraseFromDisk();
   SafeModuleBC.eraseFromDisk();
   sys::Path(SharedObject).eraseFromDisk();
@@ -885,13 +886,13 @@ bool BugDriver::debugCodeGenerator() {
   sys::Path TestModuleBC("bugpoint.test.bc");
   std::string ErrMsg;
   if (TestModuleBC.makeUnique(true, &ErrMsg)) {
-    std::cerr << getToolName() << "Error making unique filename: "
-              << ErrMsg << "\n";
+    errs() << getToolName() << "Error making unique filename: "
+           << ErrMsg << "\n";
     exit(1);
   }
 
   if (writeProgramToFile(TestModuleBC.toString(), ToCodeGen)) {
-    std::cerr << "Error writing bitcode to `" << TestModuleBC << "'\nExiting.";
+    errs() << "Error writing bitcode to `" << TestModuleBC << "'\nExiting.";
     exit(1);
   }
   delete ToCodeGen;
@@ -899,13 +900,13 @@ bool BugDriver::debugCodeGenerator() {
   // Make the shared library
   sys::Path SafeModuleBC("bugpoint.safe.bc");
   if (SafeModuleBC.makeUnique(true, &ErrMsg)) {
-    std::cerr << getToolName() << "Error making unique filename: "
-              << ErrMsg << "\n";
+    errs() << getToolName() << "Error making unique filename: "
+           << ErrMsg << "\n";
     exit(1);
   }
 
   if (writeProgramToFile(SafeModuleBC.toString(), ToNotCodeGen)) {
-    std::cerr << "Error writing bitcode to `" << SafeModuleBC << "'\nExiting.";
+    errs() << "Error writing bitcode to `" << SafeModuleBC << "'\nExiting.";
     exit(1);
   }
   std::string SharedObject = compileSharedObject(SafeModuleBC.toString());
diff --git a/tools/bugpoint/ToolRunner.cpp b/tools/bugpoint/ToolRunner.cpp
index 62290f935f..d610676d4d 100644
--- a/tools/bugpoint/ToolRunner.cpp
+++ b/tools/bugpoint/ToolRunner.cpp
@@ -63,10 +63,10 @@ static int RunProgramWithTimeout(const sys::Path &ProgramPath,
   redirects[2] = &StdErrFile;
                                    
   if (0) {
-    std::cerr << "RUN:";
+    errs() << "RUN:";
     for (unsigned i = 0; Args[i]; ++i)
-      std::cerr << " " << Args[i];
-    std::cerr << "\n";
+      errs() << " " << Args[i];
+    errs() << "\n";
   }
 
   return
@@ -87,7 +87,7 @@ static void ProcessFailure(sys::Path ProgPath, const char** Args) {
   sys::Path ErrorFilename("bugpoint.program_error_messages");
   std::string ErrMsg;
   if (ErrorFilename.makeUnique(true, &ErrMsg)) {
-    std::cerr << "Error making unique filename: " << ErrMsg << "\n";
+    errs() << "Error making unique filename: " << ErrMsg << "\n";
     exit(1);
   }
   RunProgramWithTimeout(ProgPath, Args, sys::Path(""), ErrorFilename,
@@ -159,10 +159,10 @@ int LLI::ExecuteProgram(const std::string &Bitcode,
   LLIArgs.push_back(0);
 
   std::cout << "<lli>" << std::flush;
-  DEBUG(std::cerr << "\nAbout to run:\t";
+  DEBUG(errs() << "\nAbout to run:\t";
         for (unsigned i=0, e = LLIArgs.size()-1; i != e; ++i)
-          std::cerr << " " << LLIArgs[i];
-        std::cerr << "\n";
+          errs() << " " << LLIArgs[i];
+        errs() << "\n";
         );
   return RunProgramWithTimeout(sys::Path(LLIPath), &LLIArgs[0],
       sys::Path(InputFile), sys::Path(OutputFile), sys::Path(OutputFile),
@@ -295,7 +295,7 @@ GCC::FileType LLC::OutputCode(const std::string &Bitcode,
   sys::Path uniqueFile(Bitcode+".llc.s");
   std::string ErrMsg;
   if (uniqueFile.makeUnique(true, &ErrMsg)) {
-    std::cerr << "Error making unique filename: " << ErrMsg << "\n";
+    errs() << "Error making unique filename: " << ErrMsg << "\n";
     exit(1);
   }
   OutputAsmFile = uniqueFile;
@@ -313,10 +313,10 @@ GCC::FileType LLC::OutputCode(const std::string &Bitcode,
   LLCArgs.push_back (0);
 
   std::cout << "<llc>" << std::flush;
-  DEBUG(std::cerr << "\nAbout to run:\t";
+  DEBUG(errs() << "\nAbout to run:\t";
         for (unsigned i=0, e = LLCArgs.size()-1; i != e; ++i)
-          std::cerr << " " << LLCArgs[i];
-        std::cerr << "\n";
+          errs() << " " << LLCArgs[i];
+        errs() << "\n";
         );
   if (RunProgramWithTimeout(sys::Path(LLCPath), &LLCArgs[0],
                             sys::Path(), sys::Path(), sys::Path()))
@@ -369,7 +369,7 @@ LLC *AbstractInterpreter::createLLC(const std::string &ProgramPath,
   Message = "Found llc: " + LLCPath + "\n";
   GCC *gcc = GCC::create(ProgramPath, Message, GCCArgs);
   if (!gcc) {
-    std::cerr << Message << "\n";
+    errs() << Message << "\n";
     exit(1);
   }
   return new LLC(LLCPath, gcc, Args, GCCArgs);
@@ -430,12 +430,12 @@ int JIT::ExecuteProgram(const std::string &Bitcode,
   JITArgs.push_back(0);
 
   std::cout << "<jit>" << std::flush;
-  DEBUG(std::cerr << "\nAbout to run:\t";
+  DEBUG(errs() << "\nAbout to run:\t";
         for (unsigned i=0, e = JITArgs.size()-1; i != e; ++i)
-          std::cerr << " " << JITArgs[i];
-        std::cerr << "\n";
+          errs() << " " << JITArgs[i];
+        errs() << "\n";
         );
-  DEBUG(std::cerr << "\nSending output to " << OutputFile << "\n");
+  DEBUG(errs() << "\nSending output to " << OutputFile << "\n");
   return RunProgramWithTimeout(sys::Path(LLIPath), &JITArgs[0],
       sys::Path(InputFile), sys::Path(OutputFile), sys::Path(OutputFile),
       Timeout, MemoryLimit);
@@ -460,7 +460,7 @@ GCC::FileType CBE::OutputCode(const std::string &Bitcode,
   sys::Path uniqueFile(Bitcode+".cbe.c");
   std::string ErrMsg;
   if (uniqueFile.makeUnique(true, &ErrMsg)) {
-    std::cerr << "Error making unique filename: " << ErrMsg << "\n";
+    errs() << "Error making unique filename: " << ErrMsg << "\n";
     exit(1);
   }
   OutputCFile = uniqueFile;
@@ -479,10 +479,10 @@ GCC::FileType CBE::OutputCode(const std::string &Bitcode,
   LLCArgs.push_back (0);
 
   std::cout << "<cbe>" << std::flush;
-  DEBUG(std::cerr << "\nAbout to run:\t";
+  DEBUG(errs() << "\nAbout to run:\t";
         for (unsigned i=0, e = LLCArgs.size()-1; i != e; ++i)
-          std::cerr << " " << LLCArgs[i];
-        std::cerr << "\n";
+          errs() << " " << LLCArgs[i];
+        errs() << "\n";
         );
   if (RunProgramWithTimeout(LLCPath, &LLCArgs[0], sys::Path(), sys::Path(),
                             sys::Path()))
@@ -533,7 +533,7 @@ CBE *AbstractInterpreter::createCBE(const std::string &ProgramPath,
   Message = "Found llc: " + LLCPath.toString() + "\n";
   GCC *gcc = GCC::create(ProgramPath, Message, GCCArgs);
   if (!gcc) {
-    std::cerr << Message << "\n";
+    errs() << Message << "\n";
     exit(1);
   }
   return new CBE(LLCPath, gcc, Args);
@@ -599,7 +599,7 @@ int GCC::ExecuteProgram(const std::string &ProgramFile,
   sys::Path OutputBinary (ProgramFile+".gcc.exe");
   std::string ErrMsg;
   if (OutputBinary.makeUnique(true, &ErrMsg)) {
-    std::cerr << "Error making unique filename: " << ErrMsg << "\n";
+    errs() << "Error making unique filename: " << ErrMsg << "\n";
     exit(1);
   }
   GCCArgs.push_back(OutputBinary.c_str()); // Output to the right file...
@@ -622,10 +622,10 @@ int GCC::ExecuteProgram(const std::string &ProgramFile,
   GCCArgs.push_back(0);                    // NULL terminator
 
   std::cout << "<gcc>" << std::flush;
-  DEBUG(std::cerr << "\nAbout to run:\t";
+  DEBUG(errs() << "\nAbout to run:\t";
         for (unsigned i=0, e = GCCArgs.size()-1; i != e; ++i)
-          std::cerr << " " << GCCArgs[i];
-        std::cerr << "\n";
+          errs() << " " << GCCArgs[i];
+        errs() << "\n";
         );
   if (RunProgramWithTimeout(GCCPath, &GCCArgs[0], sys::Path(), sys::Path(),
         sys::Path())) {
@@ -666,16 +666,16 @@ int GCC::ExecuteProgram(const std::string &ProgramFile,
 
   // Now that we have a binary, run it!
   std::cout << "<program>" << std::flush;
-  DEBUG(std::cerr << "\nAbout to run:\t";
+  DEBUG(errs() << "\nAbout to run:\t";
         for (unsigned i=0, e = ProgramArgs.size()-1; i != e; ++i)
-          std::cerr << " " << ProgramArgs[i];
-        std::cerr << "\n";
+          errs() << " " << ProgramArgs[i];
+        errs() << "\n";
         );
 
   FileRemover OutputBinaryRemover(OutputBinary);
 
   if (RemoteClientPath.isEmpty()) {
-    DEBUG(std::cerr << "<run locally>" << std::flush;);
+    DEBUG(errs() << "<run locally>";);
     return RunProgramWithTimeout(OutputBinary, &ProgramArgs[0],
         sys::Path(InputFile), sys::Path(OutputFile), sys::Path(OutputFile),
         Timeout, MemoryLimit);
@@ -685,8 +685,8 @@ int GCC::ExecuteProgram(const std::string &ProgramFile,
         &ProgramArgs[0], sys::Path(InputFile), sys::Path(OutputFile),
         sys::Path(OutputFile), Timeout, MemoryLimit);
     if (RemoteClientStatus != 0) {
-      std::cerr << "Remote Client failed with an error: " <<
-        RemoteClientStatus << ".\n" << std::flush;
+      errs() << "Remote Client failed with an error: " <<
+        RemoteClientStatus << ".\n";
     }
   }
 
@@ -699,7 +699,7 @@ int GCC::MakeSharedObject(const std::string &InputFile, FileType fileType,
   sys::Path uniqueFilename(InputFile+LTDL_SHLIB_EXT);
   std::string ErrMsg;
   if (uniqueFilename.makeUnique(true, &ErrMsg)) {
-    std::cerr << "Error making unique filename: " << ErrMsg << "\n";
+    errs() << "Error making unique filename: " << ErrMsg << "\n";
     exit(1);
   }
   OutputFile = uniqueFilename.toString();
@@ -757,10 +757,10 @@ int GCC::MakeSharedObject(const std::string &InputFile, FileType fileType,
   
 
   std::cout << "<gcc>" << std::flush;
-  DEBUG(std::cerr << "\nAbout to run:\t";
+  DEBUG(errs() << "\nAbout to run:\t";
         for (unsigned i=0, e = GCCArgs.size()-1; i != e; ++i)
-          std::cerr << " " << GCCArgs[i];
-        s