Fix MinGW library generation command (GH-17917)

To print the exports to stdout, the gendef command requires the option "-". Without this option, no output is generated.
(cherry picked from commit 2545fa87628b4caca519da8aeb0eeef368b9dc0d)

Co-authored-by: Baljak <baljci@hotmail.com>

diff --git a/Doc/whatsnew/3.8.rst b/Doc/whatsnew/3.8.rst
index 007e3228f9ae6d12ba8149ab57691818904dc78b..9b61e1f05542df6e6cec41ff38d260b4e0512c14 100644 (file)
--- a/Doc/whatsnew/3.8.rst
+++ b/Doc/whatsnew/3.8.rst
@@ -2111,7 +2111,7 @@ Changes in the C API
 
   .. code-block:: shell
 
-      gendef python38.dll > tmp.def
+      gendef - python38.dll > tmp.def
       dlltool --dllname python38.dll --def tmp.def --output-lib libpython38.a
 
   The location of an installed :file:`pythonXY.dll` will depend on the