[llvm] [lit] Use text mode when opening text files on z/OS (PR #217434)

[Abhina Sree via llvm-commits]

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@@ -90,9 +90,19 @@ def run(argv, stdin, stdout, stderr, cwd):
 
         if show_nonprinting:
             contents = convertToCaretAndMNotation(contents)
-        elif is_text:
-            contents = contents.encode()
+
+        # Determine if stdout expects text or binary
+        mode = getattr(stdout, "mode", "b")
+        is_text_output = "b" not in mode
+
+        if is_text_output:
+            if isinstance(contents, bytes):
+                contents = contents.decode()
+        else:
+            if isinstance(contents, str):
+                contents = contents.encode()
         stdout.write(contents)
+
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abhina-sree wrote:

thanks, fixed

https://github.com/llvm/llvm-project/pull/217434