9806: add --extension-suffix option to python-config.

Misc/NEWS

@@ -137,6 +137,10 @@ Tools/Demos
 Build
 -----
 
+- Issue #9806: python-config now has an ``--extension-suffix`` option that
+  outputs the suffix for dynamic libraries including the ABI version name
+  defined by PEP 3149.
+
 - Issue #941346: Improve the build process under AIX and allow Python to
   be built as a shared library.  Patch by Sébastien Sablé.
 

Misc/python-config.in

@@ -6,7 +6,7 @@ import sys
 import sysconfig
 
 valid_opts = ['prefix', 'exec-prefix', 'includes', 'libs', 'cflags',
-              'ldflags', 'help']
+              'ldflags', 'extension-suffix', 'help']
 
 def exit_with_usage(code=1):
     print("Usage: {0} [{1}]".format(
@@ -54,3 +54,5 @@ for opt in opt_flags:
             libs.extend(getvar('LINKFORSHARED').split())
         print(' '.join(libs))
 
+    elif opt == '--extension-suffix':
+    	print(sysconfig.get_config_var('SO'))