From 7b13a0f6cff817142f65302ec6994b78f9518361 Mon Sep 17 00:00:00 2001
From: Yannick Jadoul <yannick.jadoul@belgacom.net>
Date: Tue, 2 Feb 2021 18:56:35 +0100
Subject: [PATCH] Write logger errors to stderr

---
 cibuildwheel/logger.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/cibuildwheel/logger.py b/cibuildwheel/logger.py
index 8fe67abc1..acff2fd76 100644
--- a/cibuildwheel/logger.py
+++ b/cibuildwheel/logger.py
@@ -114,10 +114,10 @@ def error(self, error: Union[BaseException, str]) -> None:
         print()
 
         if self.fold_mode == 'github':
-            print(f'::error::{error}')
+            print(f'::error::{error}', file=sys.stderr)
         else:
             c = self.colors
-            print(f'{c.bright_red}Error{c.end} {error}')
+            print(f'{c.bright_red}Error{c.end} {error}', file=sys.stderr)
 
     def _start_fold_group(self, name: str) -> None:
         self._end_fold_group()