https://github.com/madanial0 created 
https://github.com/llvm/llvm-project/pull/120276

https://github.com/llvm/llvm-project/pull/119666 adds the `-strip-trailing-cr` 
flag to diff which is not supported on AIX switch to use the python 
implementation of diff instead

>From 1fb12758908b0cfeb8ff738c8c8f6378d6fbf8ea Mon Sep 17 00:00:00 2001
From: Mark Danial <madan...@dixon.rtp.raleigh.ibm.com>
Date: Tue, 17 Dec 2024 12:47:20 -0500
Subject: [PATCH] fix unsupported diff flag on AIX (-strip-trailing-cr)

---
 clang/test/Format/lit.local.cfg | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/clang/test/Format/lit.local.cfg b/clang/test/Format/lit.local.cfg
index 8acf02725d701b..b060c79226cbda 100644
--- a/clang/test/Format/lit.local.cfg
+++ b/clang/test/Format/lit.local.cfg
@@ -1,3 +1,6 @@
+import platform
+import lit.formats
+
 # Suffixes supported by clang-format.
 config.suffixes = [
     ".c",
@@ -19,3 +22,8 @@ config.suffixes = [
     ".td",
     ".test"
 ]
+
+# AIX 'diff' command doesn't support --strip-trailing-cr, but the internal
+# python implementation does, so use that for cross platform compatibility
+if platform.system() == "AIX":
+    config.test_format = lit.formats.ShTest()

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