Another backward compatibility issue - failed here on Ubuntu 20.04 which
is old but not ancient.

OK for mainline?

Tobias
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gcc-changelog/git_email.py: Support older unidiff.PatchSet

Commit "unidiff: use newline='\n' argument",
r13-4603-gb045179973161115c7ea029b2788f5156fc55cda, added support CR
on a line, but that broke support for older unidiff.PatchSet.

This patch uses a fallback for git_email.py (drop argument) if not
available (TypeError exception) but keeps using it in test_email.py
unconditionally.

contrib/ChangeLog:

	* gcc-changelog/git_email.py (GitEmail:__init__): Support older
	unidiff.PatchSet that do not have a newline= argument
	of from_filename.

diff --git a/contrib/gcc-changelog/git_email.py b/contrib/gcc-changelog/git_email.py
index ef50ebfb7fd..093c887ba4c 100755
--- a/contrib/gcc-changelog/git_email.py
+++ b/contrib/gcc-changelog/git_email.py
@@ -39,7 +39,11 @@ unidiff_supports_renaming = hasattr(PatchedFile(), 'is_rename')
 class GitEmail(GitCommit):
     def __init__(self, filename):
         self.filename = filename
-        diff = PatchSet.from_filename(filename, newline='\n')
+        try:
+          diff = PatchSet.from_filename(filename, newline='\n')
+        except TypeError:
+          # Older versions don't have the newline argument
+          diff = PatchSet.from_filename(filename)
         date = None
         author = None
         subject = ''

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