[SystemZ][z/OS] Distinguish between text and binary files on z/OS

This patch consists of the initial changes to help distinguish between text and binary content correctly on z/OS. I would like to get feedback from Windows users on setting OF_None for all ToolOutputFiles. This seems to have been done as an optimization to prevent CRLF translation on Windows in the past.

Reviewed By: zibi

Differential Revision: https://reviews.llvm.org/D97785

1 files changed, 7 insertions, 1 deletions

diff --git a/llvm/lib/Support/ToolOutputFile.cpp b/llvm/lib/Support/ToolOutputFile.cpp
index c2ca97a..3735aac 100644
--- a/llvm/lib/Support/ToolOutputFile.cpp
+++ b/llvm/lib/Support/ToolOutputFile.cpp
@@ -11,6 +11,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "llvm/Support/ToolOutputFile.h"
+#include "llvm/ADT/Triple.h"
 #include "llvm/Support/FileSystem.h"
 #include "llvm/Support/Signals.h"
 using namespace llvm;
@@ -45,7 +46,12 @@ ToolOutputFile::ToolOutputFile(StringRef Filename, std::error_code &EC,
     EC = std::error_code();
     return;
   }
-  OSHolder.emplace(Filename, EC, Flags);
+
+  // On Windows, we set the OF_None flag even for text files to avoid
+  // CRLF translation.
+  OSHolder.emplace(
+      Filename, EC,
+      llvm::Triple(LLVM_HOST_TRIPLE).isOSWindows() ? sys::fs::OF_None : Flags);
   OS = OSHolder.getPointer();
   // If open fails, no cleanup is needed.
   if (EC)