Change from ::stdout to stderr when reporting fatal error.

src/IceCompileServer.cpp

 //===- subzero/src/IceCompileServer.cpp - Compile server ------------------===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 ///
 /// \file
@@ skipping 91 matching lines @@
 
   // Note: This code is (mostly) copied from llvm/lib/Support/ErrorHandling.cpp
 
   // Blast the result out to stderr.  We don't try hard to make sure this
   // succeeds (e.g. handling EINTR) and we can't use errs() here because
   // raw ostreams can call report_fatal_error.
   llvm::SmallVector<char, 64> Buffer;
   llvm::raw_svector_ostream OS(Buffer);
   OS << "LLVM ERROR: " << Reason << "\n";
   llvm::StringRef MessageStr = OS.str();
-  ssize_t written =
-      ::fwrite(MessageStr.data(), sizeof(char), MessageStr.size(), ::stdout);
-  (void)written; // If something went wrong, we deliberately just give up.
+  ssize_t Written =
+      std::fwrite(MessageStr.data(), sizeof(char), MessageStr.size(), stderr);
+  (void)Written; // If something went wrong, we deliberately just give up.
 
   // If we reached here, we are failing ungracefully. Run the interrupt handlers
   // to make sure any special cleanups get done, in particular that we remove
   // files registered with RemoveFileOnSignal.
   llvm::sys::RunInterruptHandlers();
 
   exit(0);
 }
 
 } // end of anonymous namespace
@@ skipping 76 matching lines @@
     });
     CompileThread.join();
   } else {
     getCompiler().run(ExtraFlags, *Ctx.get(), std::move(InputStream));
   }
   transferErrorCode(getReturnValue(
       ExtraFlags, static_cast<ErrorCodes>(Ctx->getErrorStatus()->value())));
 }
 
 } // end of namespace Ice