From 2f891b433c42eb1554644199058c9190790ebf85 Mon Sep 17 00:00:00 2001
From: "Jason R. Coombs" <jaraco@jaraco.com>
Date: Sun, 17 Jan 2021 12:14:25 -0500
Subject: Repair Descriptions with newlines and emit a warning that the value
 will be disallowed in the future.

---
 setuptools/dist.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

(limited to 'setuptools/dist.py')

diff --git a/setuptools/dist.py b/setuptools/dist.py
index 2d0aac33..172d66b1 100644
--- a/setuptools/dist.py
+++ b/setuptools/dist.py
@@ -121,7 +121,9 @@ def read_pkg_file(self, file):
 def single_line(val):
     # quick and dirty validation for description pypa/setuptools#1390
     if '\n' in val:
-        raise ValueError("newlines not allowed")
+        # TODO after 2021-07-31: Replace with `raise ValueError("newlines not allowed")`
+        warnings.UserWarning("newlines not allowed and will break in the future")
+        val = val.replace('\n', ' ')
     return val
 
 
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