Remove dependence on header file unistd.h.

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 11 matching lines @@
 #pragma clang diagnostic push
 #pragma clang diagnostic ignored "-Wunused-parameter"
 #include "llvm/Bitcode/NaCl/NaClBitcodeMungeUtils.h"
 #include "llvm/Support/FileSystem.h"
 #include "llvm/Support/raw_os_ostream.h"
 #include "llvm/Support/Signals.h"
 #include "llvm/Support/SourceMgr.h"
 #include "llvm/Support/StreamingMemoryObject.h"
 #pragma clang diagnostic pop
 
+#include <cstdio>
 #include <fstream>
 #include <iostream>
 #include <thread>
 
-#if defined(HAVE_UNISTD_H)
-# include <unistd.h>
-#endif
-#if defined(_MSC_VER)
-# include <io.h>
-# include <fcntl.h>
-#endif
-
 namespace Ice {
 
 namespace {
 
 // Define a SmallVector backed buffer as a data stream, so that it can hold the
 // generated binary version of the textual bitcode in the input file.
 class TextDataStreamer : public llvm::DataStreamer {
 public:
   TextDataStreamer() = default;
   ~TextDataStreamer() final = default;
@@ skipping 55 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 = ::write(2, MessageStr.data(), MessageStr.size());
+  ssize_t written =
+      ::fwrite(MessageStr.data(), sizeof(char), MessageStr.size(), ::stdout);
   (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);
 }
 
@@ skipping 77 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