Always use binary mode for output stream. This is important to prevent unwanted end of line conversion on Windows. Should not affect Unix where O_BINARY is not defined. This fix /clang/test/lexer/preamble.c XFAIL on WIN32.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@116509 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Support/raw_ostream.h

@@ -349,10 +349,7 @@ public:
 
   /// raw_fd_ostream ctor - FD is the file descriptor that this writes to.  If
   /// ShouldClose is true, this closes the file when the stream is destroyed.
-  raw_fd_ostream(int fd, bool shouldClose,
+  raw_fd_ostream(int fd, bool shouldClose, bool unbuffered=false);
-                 bool unbuffered=false) : raw_ostream(unbuffered), FD(fd),
-                                          ShouldClose(shouldClose),
-                                          Error(false) {}
 
   ~raw_fd_ostream();
 

lib/Support/raw_ostream.cpp

@@ -409,6 +409,19 @@ raw_fd_ostream::raw_fd_ostream(const char *Filename, std::string &ErrorInfo,
   ShouldClose = true;
 }
 
+/// raw_fd_ostream ctor - FD is the file descriptor that this writes to.  If
+/// ShouldClose is true, this closes the file when the stream is destroyed.
+raw_fd_ostream::raw_fd_ostream(int fd, bool shouldClose, bool unbuffered)
+  : raw_ostream(unbuffered), FD(fd),
+    ShouldClose(shouldClose), Error(false) {
+#ifdef O_BINARY
+  // Setting STDOUT and STDERR to binary mode is necessary in Win32
+  // to avoid undesirable linefeed conversion.
+  if (fd == STDOUT_FILENO || fd == STDERR_FILENO)
+    setmode(fd, O_BINARY);
+#endif
+}
+
 raw_fd_ostream::~raw_fd_ostream() {
   if (FD >= 0) {
     flush();